/* Design Tokens */
:root {
    /* Color Tokens */
    --color-primary-50: #f0f9ff;
    --color-primary-100: #dbeafe;
    --color-primary-500: #2563eb;
    --color-primary-600: #2563eb;
    --color-primary-700: #1d4ed8;

    /* Neutral Colors */
    --color-neutral-50: #f8fafc;
    --color-neutral-100: #f1f5f9;
    --color-neutral-200: #e2e8f0;
    --color-neutral-300: #d1d5db;
    --color-neutral-500: #64748b;
    --color-neutral-900: #0f172a;

    /* Semantic Colors */
    --color-danger-500: #ef4444;
    --color-danger-600: #dc2626;
    --color-danger-100: #fee2e2;
    --color-danger-700: #b91c1c;
    --color-success-500: #047857; /* Updated for WCAG AA compliance */
    --color-success-600: #065f46; /* Enhanced contrast option */
    --color-success-100: #dcfce7;
    --color-success-700: #166534;
    --color-warning-500: #b45309; /* New WCAG AA compliant warning color */
    --color-warning-600: #92400e; /* Enhanced contrast option */
    --color-warning-100: #fef9c3;
    --color-warning-700: #854d0e;
    --color-info-100: #dbeafe;
    --color-info-700: #1e40af;

    /* Background Colors */
    --color-background: #ffffff;
    --color-background-secondary: #f8fafc;

    /* Typography Tokens */
    --font-family-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing Tokens */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;

    /* Border Radius */
    --border-radius-sm: 0.25rem;
    --border-radius-base: 0.375rem;
    --border-radius-md: 0.5rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.1);

    /* Transitions */
    --transition-fast: 0.15s;
    --transition-base: 0.2s;

    /* Breakpoint Tokens (aligned with Tailwind CSS) */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;

    /* Button Tokens */
    --btn-height-sm: 32px;
    --btn-height-base: 40px;
    --btn-height-lg: 48px;
    --btn-padding-sm: var(--space-2) var(--space-3);
    --btn-padding-base: var(--space-3) var(--space-4);
    --btn-padding-lg: var(--space-4) var(--space-6);
    --btn-font-size-sm: 0.875rem;
    --btn-font-size-base: 1rem;
    --btn-font-size-lg: 1.125rem;
    
    /* Form Tokens */
    --form-input-height-sm: 32px;
    --form-input-height-base: 40px;
    --form-input-height-lg: 48px;
    --form-input-padding-sm: var(--space-2) var(--space-3);
    --form-input-padding-base: var(--space-3) var(--space-4);
    --form-input-padding-lg: var(--space-4) var(--space-6);
    --form-input-font-size-sm: 0.875rem;
    --form-input-font-size-base: 1rem;
    --form-input-font-size-lg: 1.125rem;
    
    /* Form State Colors */
    --form-border-default: var(--color-neutral-300);
    --form-border-focus: var(--color-primary-500);
    --form-border-error: var(--color-danger-500);
    --form-border-success: var(--color-success-500);
    --form-bg-disabled: var(--color-neutral-50);
    --form-text-disabled: var(--color-neutral-500);
    
    /* Form Layout Tokens */
    --form-group-spacing: var(--space-4);
    --form-label-spacing: var(--space-2);
    --form-help-spacing: var(--space-1);
    --form-grid-gap: var(--space-4);
    
    /* Card Tokens */
    --card-padding-sm: var(--space-4);
    --card-padding-base: var(--space-6);
    --card-padding-lg: var(--space-8);
    --card-padding-none: 0;
    
    /* Card Semantic Background Colors */
    --card-bg-success: #dcfce7;
    --card-bg-warning: #fef9c3;
    --card-bg-danger: #fee2e2;
    --card-bg-info: #dbeafe;
    --card-bg-secondary: var(--color-neutral-50);
    
    /* Card Semantic Border Colors */
    --card-border-success: #bbf7d0;
    --card-border-warning: #fde68a;
    --card-border-danger: #fecaca;
    --card-border-info: #bfdbfe;
    --card-border-secondary: var(--color-neutral-200);
    
    /* Card Semantic Text Colors */
    --card-text-success: #166534;
    --card-text-warning: #92400e;
    --card-text-danger: #991b1b;
    --card-text-info: #1e40af;
    --card-text-secondary: var(--color-neutral-700);
}

/* Basic reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-system);
    line-height: 1.5;
    color: var(--color-neutral-900);
    background-color: var(--color-background);
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Typography */
h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
}

.text-muted {
    color: var(--color-neutral-500);
}

.text-center {
    text-align: center;
}

/* Layout */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-center {
    justify-content: center;
}

.space-x-4 > * + * {
    margin-left: 1rem;
}

.space-y-4 > * + * {
    margin-top: 1rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mb-8 {
    margin-bottom: 2rem;
}

.mt-4 {
    margin-top: 1rem;
}

.py-2 {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}

.py-4 {
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.py-8 {
    padding-top: 2rem;
    padding-bottom: 2rem;
}

.py-12 {
    padding-top: 3rem;
    padding-bottom: 3rem;
}

.px-4 {
    padding-left: 1rem;
    padding-right: 1rem;
}

.p-4 {
    padding: 1rem;
}

.p-6 {
    padding: 1.5rem;
}

/* Grid */
.grid {
    display: grid;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .md-grid-cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .lg-grid-cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Skip Navigation Links */
.skip-links {
    position: absolute;
    top: -100px;
    left: 0;
    width: 100%;
    z-index: 1000;
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2);
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-neutral-200);
}

.skip-link {
    position: relative;
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background-color: var(--color-primary-600);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius-base);
    font-size: var(--form-input-font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast) ease-in-out;
    transform: translateY(0);
    opacity: 0;
}

.skip-link:focus {
    top: 0;
    transform: translateY(0);
    opacity: 1;
    outline: 2px solid var(--color-background);
    outline-offset: 2px;
    box-shadow: var(--shadow-focus);
}

.skip-link:hover:focus {
    background-color: var(--color-primary-700);
    transform: translateY(-1px);
}

.skip-links:focus-within {
    top: 0;
    transform: translateY(0);
}

/* Enhanced Focus Management */
:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Remove default focus outline for mouse users, keep for keyboard users */
:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
    box-shadow: var(--shadow-focus);
}

/* Focus styles for interactive elements */
.btn:focus,
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 1px;
    box-shadow: var(--shadow-focus);
    border-color: var(--color-primary-500);
}

/* Enhanced keyboard navigation for cards */
.card-clickable:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
    box-shadow: var(--shadow-focus), 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

/* Focus trap for modals and dropdowns */
.focus-trap {
    position: relative;
}

.focus-trap:focus-within {
    z-index: 1000;
}

/* Dropdown focus management */
.dropdown-menu {
    position: absolute;
    z-index: 1000;
    background: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--border-radius-base);
    box-shadow: var(--shadow-base);
    padding: var(--space-2);
    min-width: 200px;
}

.dropdown-menu[aria-hidden="true"] {
    display: none;
}

.dropdown-menu[aria-hidden="false"] {
    display: block;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    text-align: left;
    background: none;
    border: none;
    border-radius: var(--border-radius-sm);
    color: var(--color-neutral-900);
    text-decoration: none;
    font-size: var(--form-input-font-size-base);
    line-height: 1.5;
    transition: background-color var(--transition-fast) ease-in-out;
    cursor: pointer;
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: var(--color-neutral-100);
    outline: none;
}

.dropdown-item:focus {
    background-color: var(--color-primary-50);
    color: var(--color-primary-700);
}

.dropdown-item[aria-current="true"] {
    background-color: var(--color-primary-100);
    color: var(--color-primary-700);
    font-weight: var(--font-weight-medium);
}

/* Tab navigation enhancements */
.tab-list {
    display: flex;
    border-bottom: 1px solid var(--color-neutral-200);
    gap: 0;
}

.tab-item {
    background: none;
    border: none;
    padding: var(--space-3) var(--space-4);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    color: var(--color-neutral-600);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast) ease-in-out;
    position: relative;
}

.tab-item:hover {
    color: var(--color-primary-600);
    background-color: var(--color-neutral-50);
}

.tab-item:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: -2px;
    z-index: 1;
}

.tab-item[aria-selected="true"] {
    color: var(--color-primary-600);
    border-bottom-color: var(--color-primary-600);
    background-color: var(--color-background);
}

/* Enhanced table keyboard navigation */
.table-responsive {
    position: relative;
    overflow-x: auto;
    overflow-y: visible;
    border-radius: var(--border-radius-base);
    border: 1px solid var(--color-neutral-200);
    width: 100%;
    display: block;
}

.table-responsive:focus-within {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--form-input-font-size-base);
}

th, td {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--color-neutral-200);
}

th {
    background-color: var(--color-neutral-50);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-700);
    position: sticky;
    top: 0;
    z-index: 1;
}

tr:hover {
    background-color: var(--color-neutral-50);
}

tr:focus-within {
    background-color: var(--color-primary-50);
    outline: 2px solid var(--color-primary-500);
    outline-offset: -2px;
}

/* Checkbox and radio button focus enhancements */
input[type="checkbox"]:focus,
input[type="radio"]:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
    box-shadow: var(--shadow-focus);
}

/* File upload focus enhancements */
.file-upload-container:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
    background-color: var(--color-primary-50);
    border-color: var(--color-primary-500);
}

.file-upload-container:focus .file-upload-text-primary {
    color: var(--color-primary-700);
}

/* Search and filter focus enhancements */
.search-container:focus-within {
    transform: scale(1.01);
    box-shadow: var(--shadow-focus), var(--shadow-base);
}

/* Button group focus management */
.btn-group {
    display: inline-flex;
    border-radius: var(--border-radius-base);
    overflow: hidden;
}

.btn-group .btn {
    border-radius: 0;
    border-right-width: 0;
    position: relative;
}

.btn-group .btn:first-child {
    border-top-left-radius: var(--border-radius-base);
    border-bottom-left-radius: var(--border-radius-base);
}

.btn-group .btn:last-child {
    border-top-right-radius: var(--border-radius-base);
    border-bottom-right-radius: var(--border-radius-base);
    border-right-width: 1px;
}

.btn-group .btn:focus {
    z-index: 2;
    border-right-width: 1px;
}

/* Collapsible content keyboard navigation */
.collapsible-trigger {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: var(--space-3);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color var(--transition-fast) ease-in-out;
}

.collapsible-trigger:hover {
    background-color: var(--color-neutral-50);
}

.collapsible-trigger:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: -2px;
    background-color: var(--color-primary-50);
}

.collapsible-trigger[aria-expanded="true"] {
    background-color: var(--color-neutral-100);
}

.collapsible-content {
    overflow: hidden;
    transition: max-height var(--transition-base) ease-in-out;
}

.collapsible-content[aria-hidden="true"] {
    max-height: 0;
}

.collapsible-content[aria-hidden="false"] {
    max-height: 1000px; /* Adjust based on content */
}

/* Breadcrumb navigation enhancements */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    list-style: none;
    padding: 0;
    margin: 0;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    margin-left: var(--space-2);
    color: var(--color-neutral-500);
}

.breadcrumb-link {
    color: var(--color-neutral-600);
    text-decoration: none;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast) ease-in-out;
}

.breadcrumb-link:hover {
    color: var(--color-primary-600);
    background-color: var(--color-neutral-100);
}

.breadcrumb-link:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 1px;
    background-color: var(--color-primary-50);
    color: var(--color-primary-700);
}

.breadcrumb-current {
    color: var(--color-neutral-900);
    font-weight: var(--font-weight-medium);
    padding: var(--space-1) var(--space-2);
}

/* Pagination focus enhancements */
.pagination {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    justify-content: center;
}

.pagination-item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: var(--space-2);
    border: 1px solid var(--color-neutral-300);
    background-color: var(--color-background);
    color: var(--color-neutral-700);
    text-decoration: none;
    border-radius: var(--border-radius-base);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast) ease-in-out;
}

.pagination-item:hover {
    background-color: var(--color-neutral-100);
    border-color: var(--color-neutral-400);
}

.pagination-item:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 1px;
    background-color: var(--color-primary-50);
    border-color: var(--color-primary-500);
    color: var(--color-primary-700);
}

.pagination-item.active {
    background-color: var(--color-primary-600);
    border-color: var(--color-primary-600);
    color: white;
}

.pagination-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}
    padding: var(--space-2) var(--space-4);
    background-color: var(--color-primary-600);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius-base);
    font-weight: var(--font-weight-medium);
    transition: 
        top var(--transition-fast) ease,
        background-color var(--transition-fast) ease,
        transform var(--transition-fast) ease;
    transform: translateY(-100px);
}

.skip-link:focus {
    top: 0;
    transform: translateY(0);
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
    box-shadow: var(--shadow-focus);
}

.skip-link:hover:focus {
    background-color: var(--color-primary-700);
}

.skip-links:focus-within {
    top: 0;
}

/* Dark mode support for skip links */
[data-theme="dark"] .skip-links {
    background-color: var(--color-neutral-900);
    border-color: var(--color-neutral-700);
}

[data-theme="dark"] .skip-link {
    background-color: var(--color-primary-500);
}

[data-theme="dark"] .skip-link:hover:focus {
    background-color: var(--color-primary-400);
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.sr-only:focus {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Form Accessibility Enhancements */
.optional-label {
    font-weight: normal;
    color: var(--color-neutral-500);
    font-size: 0.875em;
}

/* ARIA Live Region Styles */
[role="alert"],
[role="status"],
[aria-live] {
    /* Ensure live regions are visible to screen readers */
    position: relative;
}

/* Enhanced focus indicators for form elements */
.form-input:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.form-input[aria-invalid="true"] {
    border-color: var(--color-danger-500);
    box-shadow: 0 0 0 1px var(--color-danger-500);
}

.form-input[aria-invalid="true"]:focus {
    outline-color: var(--color-danger-500);
}

/* File upload accessibility */
.file-upload-container[role="button"]:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Dark mode support for accessibility features */
[data-theme="dark"] .optional-label {
    color: var(--color-neutral-400);
}

[data-theme="dark"] .form-input[aria-invalid="true"] {
    border-color: var(--color-danger-400);
    box-shadow: 0 0 0 1px var(--color-danger-400);
}

[data-theme="dark"] .form-input[aria-invalid="true"]:focus {
    outline-color: var(--color-danger-400);
}

/* Components */
.header {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-neutral-200);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.footer {
    background-color: var(--color-background-secondary);
    border-top: 1px solid var(--color-neutral-200);
    padding: var(--space-8) 0;
    margin-top: auto;
}

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-family-system);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius-base);
    cursor: pointer;
    transition: all var(--transition-base) ease-in-out;
    white-space: nowrap;
    position: relative;
    overflow: hidden;

    /* Default size (medium) */
    height: var(--btn-height-base);
    padding: var(--btn-padding-base);
    font-size: var(--btn-font-size-base);

    /* Primary variant (default) */
    background-color: var(--color-primary-500);
    color: var(--color-background);
    border-color: var(--color-primary-500);
}

.btn:hover {
    background-color: var(--color-primary-600);
    border-color: var(--color-primary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

.btn:disabled,
.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Button Variants */
.btn-outline {
    background-color: transparent;
    color: var(--color-primary-500);
    border-color: var(--color-primary-500);
}

.btn-outline:hover {
    background-color: var(--color-primary-50);
    color: var(--color-primary-600);
    border-color: var(--color-primary-600);
}

.btn-secondary {
    background-color: var(--color-neutral-100);
    color: var(--color-neutral-900);
    border-color: var(--color-neutral-200);
}

.btn-secondary:hover {
    background-color: var(--color-neutral-200);
    border-color: var(--color-neutral-300);
}

.btn-danger {
    background-color: var(--color-danger-500);
    color: var(--color-background);
    border-color: var(--color-danger-500);
}

.btn-danger:hover {
    background-color: var(--color-danger-600);
    border-color: var(--color-danger-600);
}

.btn-success {
    background-color: var(--color-success-500);
    color: var(--color-background);
    border-color: var(--color-success-500);
}

.btn-success:hover {
    background-color: var(--color-success-600);
    border-color: var(--color-success-600);
}

/* Button Sizes */
.btn-sm {
    height: var(--btn-height-sm);
    padding: var(--btn-padding-sm);
    font-size: var(--btn-font-size-sm);
    border-radius: var(--border-radius-sm);
}

.btn-lg {
    height: var(--btn-height-lg);
    padding: var(--btn-padding-lg);
    font-size: var(--btn-font-size-lg);
    border-radius: var(--border-radius-md);
}

/* Button with Icons */
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--btn-height-base);
    padding: 0;
}

.btn-icon.btn-sm {
    width: var(--btn-height-sm);
}

.btn-icon.btn-lg {
    width: var(--btn-height-lg);
}

/* Loading State */
.btn-loading {
    color: transparent;
    pointer-events: none;
}

.btn-loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: btn-loading-spin 1s linear infinite;
}

@keyframes btn-loading-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Button Groups */
.btn-group {
    display: inline-flex;
    border-radius: var(--border-radius-base);
    overflow: hidden;
}

.btn-group .btn {
    border-radius: 0;
    border-right-width: 0;
}

.btn-group .btn:first-child {
    border-top-left-radius: var(--border-radius-base);
    border-bottom-left-radius: var(--border-radius-base);
}

.btn-group .btn:last-child {
    border-top-right-radius: var(--border-radius-base);
    border-bottom-right-radius: var(--border-radius-base);
    border-right-width: 1px;
}

/* Full Width Button */
.btn-block {
    width: 100%;
    display: flex;
}

/* Card System */
.card {
    background-color: var(--color-background);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-neutral-200);
    box-shadow: var(--shadow-base);
    padding: var(--card-padding-base);
    transition: all var(--transition-base) ease-in-out;
}

/* Card Padding Variants */
.card-sm {
    padding: var(--card-padding-sm);
}

.card-lg {
    padding: var(--card-padding-lg);
}

.card-flush {
    padding: var(--card-padding-none);
}

.card-flush-x {
    padding-left: var(--card-padding-none);
    padding-right: var(--card-padding-none);
}

.card-flush-y {
    padding-top: var(--card-padding-none);
    padding-bottom: var(--card-padding-none);
}

/* Card Semantic Variants */
.card-success {
    background-color: var(--card-bg-success);
    border-color: var(--card-border-success);
    color: var(--card-text-success);
}

.card-warning {
    background-color: var(--card-bg-warning);
    border-color: var(--card-border-warning);
    color: var(--card-text-warning);
}

.card-danger {
    background-color: var(--card-bg-danger);
    border-color: var(--card-border-danger);
    color: var(--card-text-danger);
}

.card-info {
    background-color: var(--card-bg-info);
    border-color: var(--card-border-info);
    color: var(--card-text-info);
}

.card-secondary {
    background-color: var(--card-bg-secondary);
    border-color: var(--card-border-secondary);
    color: var(--card-text-secondary);
}

/* Card Layout Utilities */
.card-horizontal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

.card-vertical {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.card-centered {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.card-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.card-grid > .card {
    flex: 1;
    min-width: 250px;
}

/* Card Interactive States */
.card-clickable {
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.card-clickable:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

.card-clickable:active {
    transform: translateY(0);
}

.card-clickable:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

/* Card Component Types */
.card-stats {
    text-align: center;
}

.card-stats .card-value {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--space-2);
    color: var(--color-neutral-900);
}

.card-stats .card-label {
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-2);
    color: var(--color-neutral-700);
}

.card-stats .card-description {
    font-size: var(--form-input-font-size-sm);
    color: var(--color-neutral-500);
    margin-bottom: var(--space-4);
}

.card-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

.card-list-item .card-content {
    flex: 1;
    min-width: 0; /* Allows text truncation */
}

.card-list-item .card-actions {
    flex-shrink: 0;
    display: flex;
    gap: var(--space-2);
    align-items: center;
}

.card-empty-state {
    padding: var(--space-8) var(--card-padding-base);
    text-align: center;
}

.card-empty-state .card-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-4);
    color: var(--color-neutral-400);
}

.card-empty-state .card-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
    color: var(--color-neutral-900);
}

.card-empty-state .card-description {
    color: var(--color-neutral-500);
    margin-bottom: var(--space-6);
}

.card-modal {
    background-color: var(--color-background);
    border-radius: var(--border-radius-md);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    max-width: 32rem;
    width: 100%;
    margin: 0 auto;
    position: relative;
    z-index: 1000;
}

/* Card Header/Footer */
.card-header {
    padding: var(--card-padding-base);
    border-bottom: 1px solid var(--color-neutral-200);
    background-color: var(--color-neutral-50);
    border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
}

.card-header:first-child {
    margin-top: calc(-1 * var(--card-padding-base));
    margin-left: calc(-1 * var(--card-padding-base));
    margin-right: calc(-1 * var(--card-padding-base));
    margin-bottom: var(--card-padding-base);
}

.card-footer {
    padding: var(--card-padding-base);
    border-top: 1px solid var(--color-neutral-200);
    background-color: var(--color-neutral-50);
    border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
}

.card-footer:last-child {
    margin-bottom: calc(-1 * var(--card-padding-base));
    margin-left: calc(-1 * var(--card-padding-base));
    margin-right: calc(-1 * var(--card-padding-base));
    margin-top: var(--card-padding-base);
}

/* Card Title */
.card-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
    color: var(--color-neutral-900);
}

.card-title:last-child {
    margin-bottom: 0;
}

/* Card Subtitle */
.card-subtitle {
    font-size: var(--form-input-font-size-sm);
    color: var(--color-neutral-500);
    margin-bottom: var(--space-2);
}

/* Card Divider */
.card-divider {
    margin: var(--space-4) calc(-1 * var(--card-padding-base));
    border: 0;
    border-top: 1px solid var(--color-neutral-200);
}

/* Responsive Cards */
@media (max-width: 767px) {
    .card-grid {
        flex-direction: column;
    }
    
    .card-grid > .card {
        min-width: 0;
    }
    
    .card-horizontal {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .card-list-item {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        gap: var(--space-3);
    }
    
    .card-list-item .card-actions {
        justify-content: center;
    }
}

.nav-link {
    color: var(--color-neutral-600);
    text-decoration: none;
    padding: 0.5rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--color-neutral-900);
}

.nav-link.active {
    color: var(--color-neutral-900);
}

[data-theme="dark"] .nav-link {
    color: var(--color-neutral-400);
}

[data-theme="dark"] .nav-link:hover {
    color: var(--color-neutral-400);
}

[data-theme="dark"] .nav-link.active {
    color: var(--color-neutral-400);
}

/* Guest Navigation */
.guest-nav {
    display: flex;
    align-items: center;
}

.guest-nav .nav-link {
    margin-right: 0.5rem;
}

/* User Menu */
.user-menu-button {
    display: flex;
    align-items: center;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-neutral-700);
    transition: color var(--transition-fast);
}

.user-menu-button:hover {
    color: var(--color-neutral-900);
}

.user-name {
    margin-right: 0.5rem;
    font-weight: var(--font-weight-medium);
    color: inherit;
}

.user-avatar {
    width: 2rem;
    height: 2rem;
    border-radius: 9999px;
    background-color: var(--color-neutral-100);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-medium);
}

/* Dropdown Dividers */
.dropdown-divider {
    border-top: 1px solid var(--color-neutral-200);
    margin: 0.5rem 0;
}

.dropdown-section {
    border-bottom: 1px solid var(--color-neutral-200);
}

/* Responsive Utility Classes */

/* Responsive Display Utilities */
.hidden-mobile {
    display: block;
}

.hidden-desktop {
    display: none;
}

@media (max-width: 767px) {
    .hidden-mobile {
        display: none;
    }
    
    .hidden-desktop {
        display: block;
    }
}

/* Responsive Typography Scale */
.text-responsive {
    font-size: 0.875rem; /* 14px mobile */
}

.text-responsive-lg {
    font-size: 1rem; /* 16px mobile */
}

.text-responsive-xl {
    font-size: 1.125rem; /* 18px mobile */
}

@media (min-width: 768px) {
    .text-responsive {
        font-size: 1rem; /* 16px desktop */
    }
    
    .text-responsive-lg {
        font-size: 1.125rem; /* 18px desktop */
    }
    
    .text-responsive-xl {
        font-size: 1.25rem; /* 20px desktop */
    }
}

@media (min-width: 1024px) {
    .text-responsive {
        font-size: 1.125rem; /* 18px large desktop */
    }
    
    .text-responsive-lg {
        font-size: 1.25rem; /* 20px large desktop */
    }
    
    .text-responsive-xl {
        font-size: 1.5rem; /* 24px large desktop */
    }
}

/* Responsive Spacing Utilities */
.spacing-responsive {
    padding: var(--space-3); /* 12px mobile */
}

.spacing-responsive-lg {
    padding: var(--space-4); /* 16px mobile */
}

@media (min-width: 768px) {
    .spacing-responsive {
        padding: var(--space-4); /* 16px tablet */
    }
    
    .spacing-responsive-lg {
        padding: var(--space-6); /* 24px tablet */
    }
}

@media (min-width: 1024px) {
    .spacing-responsive {
        padding: var(--space-6); /* 24px desktop */
    }
    
    .spacing-responsive-lg {
        padding: var(--space-8); /* 32px desktop */
    }
}

/* Responsive Container */
.container-responsive {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 768px) {
    .container-responsive {
        padding: 0 var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container-responsive {
        padding: 0 var(--space-8);
    }
}

/* Responsive Flex Utilities */
.flex-responsive {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

@media (min-width: 768px) {
    .flex-responsive {
        flex-direction: row;
        gap: var(--space-4);
    }
}

.flex-responsive-reverse {
    display: flex;
    flex-direction: column-reverse;
    gap: var(--space-3);
}

@media (min-width: 768px) {
    .flex-responsive-reverse {
        flex-direction: row-reverse;
        gap: var(--space-4);
    }
}

/* Responsive Grid Utilities */
.grid-responsive {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
}

@media (min-width: 768px) {
    .grid-responsive-2 {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-6);
    }
}

@media (min-width: 1024px) {
    .grid-responsive-3 {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-6);
    }
    
    .grid-responsive-4 {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-6);
    }
}

/* Responsive Image Utilities */
.img-responsive {
    width: 100%;
    height: auto;
    max-width: 100%;
}

.img-responsive-contain {
    width: 100%;
    height: auto;
    max-width: 300px;
}

@media (min-width: 768px) {
    .img-responsive-contain {
        max-width: 400px;
    }
}

@media (min-width: 1024px) {
    .img-responsive-contain {
        max-width: 500px;
    }
}

/* Responsive Touch Targets */
.touch-target {
    min-height: 44px;
    min-width: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Auth Form Styles */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-8) var(--space-4);
}

.auth-card {
    width: 100%;
    max-width: 400px;
}

.auth-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-6);
    text-align: center;
}

.auth-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-top: var(--space-6);
}

@media (max-width: 767px) {
    .auth-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .auth-actions .btn {
        width: 100%;
    }
}

.auth-footer {
    margin-top: var(--space-8);
    text-align: center;
    border-top: 1px solid var(--color-neutral-200);
    padding-top: var(--space-6);
}

.auth-footer-text {
    color: var(--color-neutral-500);
    font-size: 0.875rem;
    margin-bottom: var(--space-4);
}

.form-success {
    background-color: var(--card-bg-success);
    border: 1px solid var(--card-border-success);
    color: var(--card-text-success);
    border-radius: var(--border-radius-base);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
}

.form-checkbox-wrapper {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-6);
}

.form-checkbox-wrapper input {
    margin-right: 0.5rem;
}

.form-checkbox-wrapper span {
    font-size: 0.875rem;
    color: var(--color-neutral-600);
}

.auth-link {
    font-size: 0.875rem;
    color: var(--color-primary-500);
    text-decoration: none;
    transition: color var(--transition-base);
}

.auth-link:hover {
    color: var(--color-primary-600);
}

/* Responsive Table System */

/* Desktop Table Styles - Enhanced table structure */
.table-responsive table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background-color: var(--color-background);
    table-layout: auto;
    min-width: 900px; /* Ensures minimum width to prevent cramping */
}

.table-responsive thead {
    background-color: var(--color-neutral-50);
}

.table-responsive th {
    padding: var(--space-3) var(--space-4);
    font-weight: var(--font-weight-medium);
    border-bottom: 1px solid var(--color-neutral-200);
    text-align: left;
    color: var(--color-neutral-700);
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.table-responsive td {
    padding: var(--space-3) var(--space-4);
    vertical-align: top;
    border-bottom: 1px solid var(--color-neutral-200);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.table-responsive tbody tr {
    display: table-row;
    width: 100%;
}

.table-responsive tbody tr:hover {
    background-color: var(--color-neutral-50);
}

/* Column width specifications for better layout stability */
.table-responsive th:first-child,
.table-responsive td:first-child {
    width: 40px; /* Checkbox column */
    min-width: 40px;
}

.table-responsive th,
.table-responsive td {
    min-width: 100px; /* Minimum width for all cells */
}

/* Table Cell Content Styles */
.table-cell-content {
    max-height: 100px;
    overflow-y: auto;
}

.table-cell-content::-webkit-scrollbar {
    width: 4px;
}

.table-cell-content::-webkit-scrollbar-track {
    background: var(--color-neutral-100);
    border-radius: 2px;
}

.table-cell-content::-webkit-scrollbar-thumb {
    background: var(--color-neutral-300);
    border-radius: 2px;
}

/* Status Badge Styles */
.status-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
}

.status-badge-pending {
    background-color: var(--color-warning-100);
    color: var(--color-warning-700);
}

.status-badge-approved {
    background-color: var(--color-success-100);
    color: var(--color-success-700);
}

.status-badge-rejected {
    background-color: var(--color-danger-100);
    color: var(--color-danger-700);
}

.status-badge-translation-needed {
    background-color: var(--color-info-100);
    color: var(--color-info-700);
}

.status-badge-no-translation-required {
    background-color: var(--color-neutral-100);
    color: var(--color-neutral-700);
}

/* Mobile Card Layout - Hidden by default on desktop */
.table-mobile-cards {
    display: none !important;
}

/* Explicitly hide mobile cards on larger screens */
@media (min-width: 768px) {
    .table-mobile-cards {
        display: none !important;
        visibility: hidden;
        height: 0;
        overflow: hidden;
    }
}

.translation-card {
    background-color: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--border-radius-base);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow-sm);
}

.translation-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.translation-card-content {
    margin-bottom: var(--space-3);
}

.translation-text-group {
    margin-bottom: var(--space-3);
}

.translation-text-label {
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.translation-text-content {
    font-size: 0.875rem;
    color: var(--color-neutral-900);
    line-height: 1.5;
    max-height: 80px;
    overflow-y: auto;
    padding: var(--space-2);
    background-color: var(--color-neutral-50);
    border-radius: var(--border-radius-sm);
}

.translation-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--color-neutral-500);
    margin-bottom: var(--space-3);
}

.translation-card-actions {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.translation-card-actions .btn {
    flex: 1;
    min-width: 0;
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
    height: auto;
}

/* Table Actions Menu for Mobile */
.table-actions-menu {
    position: relative;
}

.table-actions-toggle {
    background: none;
    border: none;
    padding: var(--space-2);
    border-radius: var(--border-radius-base);
    color: var(--color-neutral-500);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 44px;
}

.table-actions-toggle:hover {
    background-color: var(--color-neutral-100);
    color: var(--color-neutral-700);
}

.table-actions-dropdown {
    position: absolute;
    right: 0;
    top: 100%;
    z-index: 10;
    background-color: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--border-radius-base);
    box-shadow: var(--shadow-base);
    min-width: 150px;
    padding: var(--space-2);
    display: none;
}

.table-actions-dropdown.show {
    display: block;
}

.table-actions-item {
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--border-radius-sm);
    color: var(--color-neutral-700);
    text-decoration: none;
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color var(--transition-base);
}

.table-actions-item:hover {
    background-color: var(--color-neutral-100);
}

.table-actions-item.danger {
    color: var(--color-danger-600);
}

.table-actions-item.danger:hover {
    background-color: var(--color-danger-50);
}

/* Responsive Behavior - Ensure proper mobile/desktop switching */
@media (max-width: 767px) {
    .table-responsive {
        display: none !important;
    }
    
    .table-mobile-cards {
        display: block !important;
    }
    
    .translation-card-actions .btn {
        font-size: 0.75rem;
        padding: 0.5rem 0.75rem;
    }
}

/* Dashboard Responsive Styles */

/* Dashboard Header */
.dashboard-header {
    margin-bottom: var(--space-8);
}

.dashboard-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
    color: var(--color-neutral-900);
}

.dashboard-welcome {
    color: var(--color-neutral-500);
    margin: 0;
}

/* Dashboard Stats Grid */
.dashboard-stats {
    display: grid;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

/* Mobile: Single column */
@media (max-width: 767px) {
    .dashboard-stats {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
}

/* Tablet: 2 columns */
@media (min-width: 768px) {
    .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop: 3 columns */
@media (min-width: 1024px) {
    .dashboard-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Dashboard Stat Cards */
.dashboard-stat-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 160px;
}

.stat-content {
    margin-bottom: var(--space-4);
}

.stat-title {
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-2);
    color: var(--color-neutral-900);
}

.stat-value {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
    color: var(--color-neutral-900);
}

.stat-description {
    font-size: 0.875rem;
    color: var(--color-neutral-500);
    line-height: 1.5;
}

.stat-action {
    margin-top: auto;
}

/* Dashboard Sections */
.dashboard-section {
    margin-top: var(--space-8);
}

.dashboard-section-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
    color: var(--color-neutral-900);
}

.dashboard-grid {
    display: grid;
    gap: var(--space-4);
}

/* Dashboard List Cards */
.dashboard-list-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

@media (max-width: 767px) {
    .dashboard-list-card {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        gap: var(--space-3);
    }
    
    .dashboard-list-card .btn {
        width: 100%;
    }
}

.dashboard-list-content {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex: 1;
}

@media (max-width: 767px) {
    .dashboard-list-content {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }
}

.dashboard-list-avatar {
    width: 3rem;
    height: 3rem;
    border-radius: var(--border-radius-md);
    background-color: var(--color-neutral-100);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.dashboard-list-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--border-radius-md);
}

.dashboard-list-avatar svg {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--color-neutral-500);
}

.dashboard-list-info {
    flex: 1;
}

.dashboard-list-title {
    font-size: 1.125rem;
    font-weight: var(--font-weight-medium);
    margin-bottom: 0.25rem;
    color: var(--color-neutral-900);
}

.dashboard-list-meta {
    font-size: 0.875rem;
    color: var(--color-neutral-500);
}

/* Dashboard Invitation Cards */
.invitation-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

@media (max-width: 767px) {
    .invitation-card {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        gap: var(--space-3);
    }
}

.invitation-content {
    flex: 1;
}

.invitation-title {
    font-size: 1.125rem;
    font-weight: var(--font-weight-medium);
    margin-bottom: 0.25rem;
    color: var(--color-neutral-900);
}

.invitation-meta {
    font-size: 0.875rem;
    color: var(--color-neutral-500);
}

.invitation-actions {
    display: flex;
    gap: var(--space-2);
    flex-shrink: 0;
}

@media (max-width: 767px) {
    .invitation-actions {
        width: 100%;
    }
    
    .invitation-actions .btn {
        flex: 1;
    }
}

/* Dashboard Container */
.dashboard-container {
    padding: var(--space-8) 0;
}

@media (max-width: 767px) {
    .dashboard-container {
        padding: var(--space-6) 0;
    }
}

/* Dashboard "View All" Link */
.dashboard-view-all {
    text-align: center;
    margin-top: var(--space-4);
}

.dashboard-view-all a {
    color: var(--color-primary-500);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-base);
}

.dashboard-view-all a:hover {
    color: var(--color-primary-600);
}

/* Mobile navigation */
.mobile-nav-links {
    display: none;
}

.mobile-nav-item.active {
    background-color: #f8fafc;
    color: #0f172a;
    font-weight: 500;
}

/* Dropdown menus */
.dropdown {
    position: relative;
}

.dropdown-menu {
    display: none; /* Hidden by default, shown with .show class */
    position: absolute;
    right: 0;
    top: 100%;
    background-color: #fff;
    border-radius: 0.375rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
    min-width: 10rem;
    z-index: 10;
    margin-top: 0.5rem;
}

.dropdown-menu.show {
    display: block !important; /* Ensure it overrides the default display: none */
}

.dropdown-item {
    display: block;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: #0f172a;
}

.dropdown-item:hover {
    background-color: #f1f5f9;
}

/* Form System */
.form-group {
    margin-bottom: var(--form-group-spacing);
}

.form-label {
    display: block;
    font-weight: var(--font-weight-medium);
    color: var(--color-neutral-900);
    margin-bottom: var(--form-label-spacing);
    font-size: var(--form-input-font-size-base);
}

.form-label.required::after {
    content: " *";
    color: var(--color-danger-500);
}

/* Form Input Base */
.form-input {
    display: block;
    width: 100%;
    font-family: var(--font-family-system);
    font-weight: var(--font-weight-normal);
    line-height: 1.5;
    color: var(--color-neutral-900);
    background-color: var(--color-background);
    border: 1px solid var(--form-border-default);
    border-radius: var(--border-radius-base);
    transition: all var(--transition-fast) ease-in-out;
    
    /* Default size (medium) */
    height: var(--form-input-height-base);
    padding: var(--form-input-padding-base);
    font-size: var(--form-input-font-size-base);
}

.form-input::placeholder {
    color: var(--color-neutral-500);
    opacity: 1;
}

.form-input:focus {
    outline: none;
    border-color: var(--form-border-focus);
    box-shadow: var(--shadow-focus);
}

.form-input:disabled {
    background-color: var(--form-bg-disabled);
    color: var(--form-text-disabled);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Form Input Sizes */
.form-input-sm {
    height: var(--form-input-height-sm);
    padding: var(--form-input-padding-sm);
    font-size: var(--form-input-font-size-sm);
    border-radius: var(--border-radius-sm);
}

.form-input-lg {
    height: var(--form-input-height-lg);
    padding: var(--form-input-padding-lg);
    font-size: var(--form-input-font-size-lg);
    border-radius: var(--border-radius-md);
}

/* Form Input States */
.form-input-error {
    border-color: var(--form-border-error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-input-success {
    border-color: var(--form-border-success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Textarea Specific */
textarea.form-input {
    height: auto;
    min-height: 80px;
    resize: vertical;
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
}

textarea.form-input-sm {
    min-height: 60px;
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
}

textarea.form-input-lg {
    min-height: 100px;
    padding-top: var(--space-4);
    padding-bottom: var(--space-4);
}

/* Select Specific */
select.form-input {
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
    background-position: right 0.75rem center;
    background-repeat: no-repeat;
    background-size: 1rem 1rem;
    padding-right: 3rem;
    padding-top: 0;
    padding-bottom: 0;
    line-height: var(--form-input-height-base);
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

/* Select Sizes */
select.form-input-sm {
    line-height: var(--form-input-height-sm);
    padding-top: 0;
    padding-bottom: 0;
}

select.form-input-lg {
    line-height: var(--form-input-height-lg);
    padding-top: 0;
    padding-bottom: 0;
}

select.form-input:focus {
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%233b82f6' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
}

/* Fallback for browsers that don't support custom select styling */
select.form-input.fallback {
    background-image: none;
    padding-right: var(--space-4);
}

/* Form Help Text */
.form-help {
    display: block;
    margin-top: var(--form-help-spacing);
    font-size: var(--form-input-font-size-sm);
    color: var(--color-neutral-500);
    line-height: 1.4;
}

/* Form Error Messages */
.form-error {
    display: block;
    margin-top: var(--form-help-spacing);
    font-size: var(--form-input-font-size-sm);
    color: var(--color-danger-500);
    line-height: 1.4;
}

.form-error-list {
    margin: 0;
    padding-left: var(--space-4);
    list-style-type: disc;
}

.form-error-list li {
    margin-bottom: var(--space-1);
}

/* Form Success Messages */
.form-success {
    display: block;
    margin-top: var(--form-help-spacing);
    font-size: var(--form-input-font-size-sm);
    color: var(--color-success-500);
    line-height: 1.4;
}

/* Custom Form Controls */
.form-checkbox,
.form-radio {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    font-size: var(--form-input-font-size-base);
    color: var(--color-neutral-900);
}

.form-checkbox input[type="checkbox"],
.form-radio input[type="radio"] {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 1px solid var(--form-border-default);
    background-color: var(--color-background);
    border-radius: var(--border-radius-sm);
    position: relative;
    cursor: pointer;
    transition: all var(--transition-fast) ease-in-out;
}

.form-radio input[type="radio"] {
    border-radius: 50%;
}

.form-checkbox input[type="checkbox"]:checked,
.form-radio input[type="radio"]:checked {
    background-color: var(--color-primary-500);
    border-color: var(--color-primary-500);
}

.form-checkbox input[type="checkbox"]:checked::after {
    content: "✓";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.form-radio input[type="radio"]:checked::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    background-color: white;
    border-radius: 50%;
}

.form-checkbox input[type="checkbox"]:focus,
.form-radio input[type="radio"]:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

/* Form Search */
.form-search {
    position: relative;
}

.form-search .form-input {
    padding-left: 2.5rem;
}

.form-search::before {
    content: "🔍";
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-neutral-500);
    z-index: 1;
    pointer-events: none;
}

/* Form Layout */
.form-grid {
    display: grid;
    gap: var(--form-grid-gap);
}

.form-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.form-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.form-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 767px) {
    .form-grid-2,
    .form-grid-3,
    .form-grid-4 {
        grid-template-columns: 1fr;
    }
}

.form-stack {
    display: flex;
    flex-direction: column;
    gap: var(--form-group-spacing);
}

.form-inline {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: var(--space-3);
    align-items: center;
    flex-wrap: wrap;
    margin-top: var(--space-6);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-neutral-200);
}

.form-actions-center {
    justify-content: center;
}

.form-actions-end {
    justify-content: flex-end;
}

/* Form File Upload */
.form-file {
    position: relative;
    display: inline-block;
    overflow: hidden;
    cursor: pointer;
    border: 2px dashed var(--color-neutral-300);
    border-radius: var(--border-radius-base);
    padding: var(--space-6);
    text-align: center;
    transition: all var(--transition-base) ease-in-out;
    background-color: var(--color-background);
}

.form-file:hover {
    border-color: var(--color-primary-500);
    background-color: var(--color-primary-50);
}

.form-file input[type="file"] {
    position: absolute;
    left: -9999px;
    opacity: 0;
}

.form-file-text {
    color: var(--color-neutral-500);
    font-size: var(--form-input-font-size-base);
}

.form-file-icon {
    display: block;
    margin: 0 auto var(--space-2);
    width: 48px;
    height: 48px;
    color: var(--color-neutral-400);
}

/* Hidden elements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Sections */
.hero-section {
    padding: 4rem 0;
}

.features-section {
    padding: 4rem 0;
    background-color: #f8fafc;
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 0.5rem;
    background-color: #dbeafe;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.feature-icon svg {
    width: 1.5rem;
    height: 1.5rem;
    color: #3b82f6;
}

/* Utility */
.hidden {
    display: none;
}

/* Responsive styles */
@media (max-width: 767px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .card {
        padding: 1rem;
    }

    .container {
        padding: 0 0.75rem;
    }

    .dropdown-menu {
        width: 200px;
    }
}

@media (min-width: 768px) {
    .sm-block {
        display: block;
    }

    h1 {
        font-size: 3rem;
    }
}

/* Globe SVG */
.globe-icon {
    width: 100%;
    max-width: 400px;
    height: auto;
    color: #3b82f6;
    opacity: 0.2;
    margin: 2rem 0;
}

/* ==========================================================================
   RESPONSIVE COMPONENT PATTERNS
   ========================================================================== */

/* Breadcrumb Component */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    color: var(--color-neutral-500);
    margin-bottom: var(--space-6);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.breadcrumb-link {
    color: var(--color-primary-600);
    text-decoration: none;
    transition: color var(--transition-base);
}

.breadcrumb-link:hover {
    color: var(--color-primary-700);
    text-decoration: underline;
}

.breadcrumb-current {
    color: var(--color-neutral-900);
    font-weight: var(--font-weight-medium);
}

.breadcrumb-separator {
    color: var(--color-neutral-400);
    font-size: 0.75rem;
}

/* Mobile breadcrumb behavior */
@media (max-width: 767px) {
    .breadcrumb {
        margin-bottom: var(--space-4);
    }
    
    .breadcrumb-mobile-toggle {
        display: flex;
        align-items: center;
        gap: var(--space-2);
        background: none;
        border: none;
        color: var(--color-primary-600);
        font-size: 0.875rem;
        cursor: pointer;
        padding: var(--space-2);
        border-radius: var(--border-radius-base);
    }
    
    .breadcrumb-mobile-toggle:hover {
        background-color: var(--color-primary-50);
    }
    
    .breadcrumb-mobile-full {
        display: none;
        flex-direction: column;
        gap: var(--space-2);
        background-color: var(--color-background);
        border: 1px solid var(--color-neutral-200);
        border-radius: var(--border-radius-base);
        padding: var(--space-3);
        margin-top: var(--space-2);
        box-shadow: var(--shadow-base);
    }
    
    .breadcrumb-mobile-full.active {
        display: flex;
    }
    
    .breadcrumb-item {
        padding: var(--space-1) 0;
        border-bottom: 1px solid var(--color-neutral-100);
    }
    
    .breadcrumb-item:last-child {
        border-bottom: none;
    }
}

/* Action Button Groups */
.action-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.action-group-horizontal {
    flex-direction: row;
}

.action-group-end {
    justify-content: flex-end;
}

.action-group-center {
    justify-content: center;
}

.action-group-between {
    justify-content: space-between;
}

/* Mobile action group behavior */
@media (max-width: 767px) {
    .action-group {
        flex-direction: column;
        width: 100%;
        gap: var(--space-3);
    }
    
    .action-group > .btn {
        width: 100%;
        min-height: 44px; /* Touch target compliance */
        justify-content: center;
    }
    
    .action-group-mobile-horizontal {
        flex-direction: row;
    }
    
    .action-group-mobile-horizontal > .btn {
        width: auto;
        flex: 1;
    }
    
    /* Stack admin forms vertically */
    .admin-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .admin-actions > form {
        width: 100%;
        margin-bottom: var(--space-3);
    }
    
    .admin-actions > form:last-child {
        margin-bottom: 0;
    }
}

/* Tablet action group behavior */
@media (min-width: 768px) and (max-width: 1023px) {
    .action-group {
        gap: var(--space-2);
    }
    
    .action-group > .btn {
        min-width: 120px;
    }
}

/* Modal Responsive Patterns */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    padding: var(--space-4);
}

.modal-container {
    background-color: var(--color-background);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: var(--space-6) var(--space-6) var(--space-4);
    border-bottom: 1px solid var(--color-neutral-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-900);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    padding: var(--space-2);
    cursor: pointer;
    border-radius: var(--border-radius-base);
    color: var(--color-neutral-500);
    transition: all var(--transition-base);
}

.modal-close:hover {
    background-color: var(--color-neutral-100);
    color: var(--color-neutral-700);
}

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    padding: var(--space-4) var(--space-6) var(--space-6);
    border-top: 1px solid var(--color-neutral-200);
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
}

/* Mobile modal behavior */
@media (max-width: 767px) {
    .modal-overlay {
        padding: var(--space-2);
        align-items: flex-start;
        padding-top: var(--space-8);
    }
    
    .modal-container {
        max-width: 100%;
        border-radius: var(--border-radius-base);
        max-height: 85vh;
    }
    
    .modal-header {
        padding: var(--space-4);
    }
    
    .modal-body {
        padding: var(--space-4);
    }
    
    .modal-footer {
        padding: var(--space-4);
        flex-direction: column-reverse;
    }
    
    .modal-footer > .btn {
        width: 100%;
        min-height: 44px;
        justify-content: center;
    }
    
    /* Touch-friendly close area */
    .modal-close {
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* Tablet modal behavior */
@media (min-width: 768px) and (max-width: 1023px) {
    .modal-container {
        max-width: 600px;
    }
    
    .modal-footer {
        flex-direction: row;
    }
}

/* Page Header with Actions */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    gap: var(--space-4);
}

.page-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-neutral-900);
    margin: 0;
}

.page-actions {
    display: flex;
    gap: var(--space-2);
    flex-shrink: 0;
}

/* Mobile page header behavior */
@media (max-width: 767px) {
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-4);
    }
    
    .page-actions {
        width: 100%;
        justify-content: stretch;
    }
    
    .page-actions > .btn {
        flex: 1;
        min-height: 44px;
        justify-content: center;
    }
}

/* Dropdown Responsive Patterns */
.dropdown-container {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--border-radius-base);
    box-shadow: var(--shadow-base);
    padding: var(--space-2) 0;
    min-width: 160px;
    z-index: 10;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
}

.dropdown-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-4);
    text-align: left;
    background: none;
    border: none;
    color: var(--color-neutral-700);
    text-decoration: none;
    transition: background-color var(--transition-base);
}

.dropdown-item:hover {
    background-color: var(--color-neutral-50);
    color: var(--color-neutral-900);
}

/* Mobile dropdown behavior */
@media (max-width: 767px) {
    .dropdown-menu {
        position: fixed;
        top: auto;
        bottom: var(--space-4);
        left: var(--space-4);
        right: var(--space-4);
        width: auto;
        border-radius: var(--border-radius-md);
        transform: translateY(100%);
    }
    
    .dropdown-menu.active {
        transform: translateY(0);
    }
    
    .dropdown-item {
        padding: var(--space-4);
        font-size: 1rem;
        border-bottom: 1px solid var(--color-neutral-100);
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .dropdown-item:last-child {
        border-bottom: none;
    }
}

/* ==========================================================================
   RESPONSIVE MEDIA HANDLING
   ========================================================================== */

/* Base Responsive Image Classes */
.img-responsive {
    width: 100%;
    height: auto;
    max-width: 100%;
    display: block;
}

.img-responsive-contain {
    width: 100%;
    height: auto;
    max-width: 300px;
    object-fit: contain;
}

.img-responsive-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Avatar and Logo System */
.avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-md);
    background-color: var(--color-neutral-100);
    overflow: hidden;
    flex-shrink: 0;
}

.avatar-xs {
    width: 1.5rem;
    height: 1.5rem;
}

.avatar-sm {
    width: 2rem;
    height: 2rem;
}

.avatar-base {
    width: 3rem;
    height: 3rem;
}

.avatar-lg {
    width: 4rem;
    height: 4rem;
}

.avatar-xl {
    width: 6rem;
    height: 6rem;
}

.avatar-2xl {
    width: 8rem;
    height: 8rem;
}

.avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: inherit;
}

.avatar-icon {
    color: var(--color-neutral-500);
    width: 60%;
    height: 60%;
}

/* Organization Logo Specific Styles */
.organization-logo {
    border-radius: var(--border-radius-base);
    background-color: var(--color-neutral-100);
    overflow: hidden;
}

.organization-logo-sm {
    width: 2rem;
    height: 2rem;
}

.organization-logo-base {
    width: 3rem;
    height: 3rem;
}

.organization-logo-lg {
    width: 4rem;
    height: 4rem;
}

.organization-logo-xl {
    width: 6rem;
    height: 6rem;
}

.organization-logo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: inherit;
    transition: transform var(--transition-base);
}

.organization-logo-img:hover {
    transform: scale(1.05);
}

/* File Upload Responsive Containers */
.file-upload-container {
    position: relative;
    border: 2px dashed var(--color-neutral-300);
    border-radius: var(--border-radius-md);
    padding: var(--space-6);
    text-align: center;
    background-color: var(--color-neutral-50);
    transition: all var(--transition-base);
    cursor: pointer;
}

.file-upload-container:hover {
    border-color: var(--color-primary-400);
    background-color: var(--color-primary-50);
}

.file-upload-container.drag-over {
    border-color: var(--color-primary-500);
    background-color: var(--color-primary-100);
}

.file-upload-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
}

.file-upload-icon {
    width: 3rem;
    height: 3rem;
    color: var(--color-neutral-400);
}

.file-upload-text {
    color: var(--color-neutral-600);
    font-size: 0.875rem;
}

.file-upload-text-primary {
    color: var(--color-primary-600);
    font-weight: var(--font-weight-medium);
}

.file-upload-hint {
    color: var(--color-neutral-500);
    font-size: 0.75rem;
    margin-top: var(--space-2);
}

/* File Upload Preview */
.file-preview {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--border-radius-base);
    background-color: var(--color-background);
    margin-top: var(--space-3);
}

.file-preview-image {
    width: 3rem;
    height: 3rem;
    border-radius: var(--border-radius-base);
    object-fit: cover;
    background-color: var(--color-neutral-100);
}

.file-preview-info {
    flex: 1;
    min-width: 0;
}

.file-preview-name {
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-neutral-900);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-preview-size {
    font-size: 0.75rem;
    color: var(--color-neutral-500);
}

.file-preview-remove {
    background: none;
    border: none;
    color: var(--color-danger-500);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--border-radius-base);
    transition: background-color var(--transition-base);
}

.file-preview-remove:hover {
    background-color: var(--color-danger-50);
}

/* Responsive Media Containers */
.media-container {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius-base);
}

.media-container-16-9 {
    aspect-ratio: 16 / 9;
}

.media-container-4-3 {
    aspect-ratio: 4 / 3;
}

.media-container-square {
    aspect-ratio: 1 / 1;
}

.media-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Lazy Loading Support */
.lazy-loading {
    background-color: var(--color-neutral-100);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.lazy-loading-spinner {
    width: 2rem;
    height: 2rem;
    border: 2px solid var(--color-neutral-200);
    border-top: 2px solid var(--color-primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Mobile Media Optimizations */
@media (max-width: 767px) {
    .file-upload-container {
        padding: var(--space-4);
    }
    
    .file-upload-icon {
        width: 2rem;
        height: 2rem;
    }
    
    .file-upload-text {
        font-size: 1rem;
    }
    
    .file-upload-hint {
        font-size: 0.875rem;
    }
    
    /* Touch-friendly file upload areas */
    .file-upload-container {
        min-height: 120px;
        touch-action: manipulation;
    }
    
    /* Responsive avatar sizing for mobile */
    .avatar-responsive-mobile .avatar-base {
        width: 2.5rem;
        height: 2.5rem;
    }
    
    .avatar-responsive-mobile .avatar-lg {
        width: 3rem;
        height: 3rem;
    }
    
    .avatar-responsive-mobile .avatar-xl {
        width: 4rem;
        height: 4rem;
    }
    
    /* Organization logo mobile sizing */
    .organization-logo-responsive-mobile .organization-logo-base {
        width: 2.5rem;
        height: 2.5rem;
    }
    
    .organization-logo-responsive-mobile .organization-logo-lg {
        width: 3rem;
        height: 3rem;
    }
    
    /* File preview mobile optimization */
    .file-preview {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    
    .file-preview-image {
        width: 100%;
        height: 8rem;
        object-fit: cover;
    }
}

/* Tablet Media Optimizations */
@media (min-width: 768px) and (max-width: 1023px) {
    .file-upload-container {
        padding: var(--space-6);
    }
    
    .avatar-responsive-tablet .avatar-xl {
        width: 5rem;
        height: 5rem;
    }
    
    .organization-logo-responsive-tablet .organization-logo-xl {
        width: 5rem;
        height: 5rem;
    }
}

/* High DPI / Retina Display Support */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 2dppx) {
    .organization-logo-img,
    .avatar-img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Print Media Styles */
@media print {
    .file-upload-container,
    .file-preview-remove {
        display: none;
    }
    
    .organization-logo-img,
    .avatar-img {
        print-color-adjust: exact;
    }
}

/* ==========================================================================
   ADVANCED RESPONSIVE FEATURES
   ========================================================================== */

/* Container Queries Support (Progressive Enhancement) */
@supports (container-type: inline-size) {
    .container-responsive {
        container-type: inline-size;
    }
    
    /* Component adapts based on its container size, not viewport */
    @container (max-width: 400px) {
        .card-responsive {
            padding: var(--space-3);
            font-size: 0.875rem;
        }
        
        .card-responsive .btn {
            width: 100%;
            font-size: 0.875rem;
        }
    }
    
    @container (min-width: 401px) and (max-width: 600px) {
        .card-responsive {
            padding: var(--space-4);
        }
    }
    
    @container (min-width: 601px) {
        .card-responsive {
            padding: var(--space-6);
        }
    }
}

/* Responsive Animations */
@media (prefers-reduced-motion: no-preference) {
    .animate-responsive {
        transition: all var(--transition-base) ease-in-out;
    }
    
    .animate-slide-in {
        transform: translateY(20px);
        opacity: 0;
        animation: slideIn 0.5s ease-out forwards;
    }
    
    @keyframes slideIn {
        to {
            transform: translateY(0);
            opacity: 1;
        }
    }
    
    .animate-fade-in {
        opacity: 0;
        animation: fadeIn 0.3s ease-out forwards;
    }
    
    @keyframes fadeIn {
        to {
            opacity: 1;
        }
    }
    
    /* Hover animations (desktop only) */
    @media (hover: hover) {
        .hover-lift:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        
        .hover-scale:hover {
            transform: scale(1.02);
        }
    }
}

/* Enhanced Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    /* Disable all animations and transitions for vestibular safety */
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    /* Remove specific animations that could cause vestibular issues */
    .animate-slide-in,
    .animate-fade-in,
    .hover-lift,
    .hover-scale {
        animation: none !important;
        opacity: 1;
        transform: none !important;
    }
    
    /* Disable parallax and auto-playing content */
    .parallax-container {
        transform: none !important;
    }
    
    .auto-carousel {
        animation-play-state: paused !important;
    }
    
    /* Enhanced focus indicators for reduced motion users */
    :focus-visible {
        outline: 3px solid var(--color-primary-500) !important;
        outline-offset: 2px !important;
        /* Use solid border instead of animated effects */
        box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.2) !important;
    }
    
    /* Static hover states instead of animated ones */
    .btn:hover {
        background-color: var(--color-primary-600);
        transform: none !important;
        box-shadow: var(--shadow-base);
    }
    
    /* Remove loading spinner animations */
    .loading-spinner {
        animation: none !important;
        border: 3px solid var(--color-neutral-300);
        border-top: 3px solid var(--color-primary-500);
    }
    
    /* Static progress indicators */
    .progress-bar {
        transition: none !important;
    }
    
    /* Disable smooth scrolling */
    html {
        scroll-behavior: auto !important;
    }
}

/* Dark Mode Support - Manual and Automatic */
.dark-theme,
[data-theme="dark"] {
    --color-background: #0f172a;
    --color-background-secondary: #1e293b;
    --color-neutral-50: #1e293b;
    --color-neutral-100: #334155;
    --color-neutral-200: #475569;
    --color-neutral-300: #64748b;
    --color-neutral-500: #94a3b8;
    --color-neutral-900: #f1f5f9;
    /* Better contrast colors for dark mode */
    --color-success-400: #4ade80;
    --color-success-500: #22c55e;
    --color-danger-400: #f87171;
    --color-danger-500: #ef4444;
}

/* Automatic dark mode for users who haven't set a preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-background: #0f172a;
        --color-background-secondary: #1e293b;
        --color-neutral-50: #1e293b;
        --color-neutral-100: #334155;
        --color-neutral-200: #475569;
        --color-neutral-300: #64748b;
        --color-neutral-500: #94a3b8;
        --color-neutral-900: #f1f5f9;
        /* Better contrast colors for dark mode */
        --color-success-400: #4ade80;
        --color-success-500: #22c55e;
        --color-danger-400: #f87171;
        --color-danger-500: #ef4444;
    }
}

/* Light mode override */
.light-theme,
[data-theme="light"] {
    --color-background: #ffffff;
    --color-background-secondary: #f8fafc;
    --color-neutral-50: #f8fafc;
    --color-neutral-100: #f1f5f9;
    --color-neutral-200: #e2e8f0;
    --color-neutral-300: #d1d5db;
    --color-neutral-500: #64748b;
    --color-neutral-900: #0f172a;
}

/* Dark Mode Toggle Button */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--border-radius-md);
    padding: var(--space-2);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    margin-left: var(--space-3);
    margin-right: 0.75rem; /* Add spacing between toggle and user menu */
    color: var(--color-neutral-600);
}

.theme-toggle:hover {
    border-color: var(--color-primary-400);
    background-color: var(--color-primary-50);
    color: var(--color-primary-600);
}

.theme-toggle:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.theme-toggle svg {
    width: 1.25rem;
    height: 1.25rem;
    transition: transform var(--transition-base);
}

.theme-toggle:hover svg {
    transform: scale(1.1);
}

/* Icon visibility based on theme */
.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

.dark-theme .theme-toggle .sun-icon,
[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

.dark-theme .theme-toggle .moon-icon,
[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

/* Smooth transitions for theme changes */
* {
    transition: background-color var(--transition-base), 
                border-color var(--transition-base), 
                color var(--transition-base);
}

/* Mobile theme toggle positioning */
@media (max-width: 767px) {
    .theme-toggle {
        margin-left: var(--space-2);
        width: 36px;
        height: 36px;
    }
    
    .theme-toggle svg {
        width: 1rem;
        height: 1rem;
    }
}

/* High Contrast Mode Support - Enhanced */
@media (prefers-contrast: high) {
    :root {
        /* Enhanced high contrast colors for maximum visibility */
        --color-primary-500: #000080; /* Navy blue for better contrast */
        --color-primary-600: #000066;
        --color-danger-500: #cc0000; /* Pure red */
        --color-success-500: #006600; /* Darker green for contrast */
        --color-warning-500: #cc6600; /* Enhanced orange */
        --color-neutral-900: #000000; /* True black text */
        --color-background: #ffffff; /* Pure white background */
        
        /* Enhanced border colors for visibility */
        --form-border-default: #333333;
        --form-border-focus: #000080;
    }
    
    /* Enhanced button visibility */
    .btn {
        border: 3px solid currentColor !important;
        font-weight: var(--font-weight-bold);
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    }
    
    .btn:hover {
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
        transform: translateY(-1px);
    }
    
    /* Enhanced card visibility */
    .card {
        border: 3px solid var(--color-neutral-900) !important;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }
    
    /* Enhanced form control visibility */
    .form-input,
    .form-select,
    .form-textarea {
        border: 3px solid var(--form-border-default) !important;
        font-weight: var(--font-weight-medium);
    }
    
    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
        border-color: var(--form-border-focus) !important;
        box-shadow: 0 0 0 3px rgba(0, 0, 128, 0.3);
    }
    
    /* Enhanced text visibility */
    h1, h2, h3, h4, h5, h6 {
        font-weight: var(--font-weight-bold);
        text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
    }
    
    /* Enhanced link visibility */
    a {
        text-decoration: underline !important;
        text-decoration-thickness: 3px !important;
        text-underline-offset: 3px;
        font-weight: var(--font-weight-semibold);
    }
    
    a:hover {
        text-decoration-thickness: 4px !important;
        background-color: rgba(0, 0, 128, 0.1);
        padding: 2px 4px;
        border-radius: 2px;
    }
    
    /* Enhanced focus indicators */
    :focus-visible {
        outline: 4px solid #000080 !important;
        outline-offset: 3px !important;
        box-shadow: 0 0 0 7px rgba(0, 0, 128, 0.2);
    }
    
    /* Enhanced status indicators */
    .status-badge {
        border-width: 3px !important;
        font-weight: var(--font-weight-bold);
        text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.2);
    }
    
    /* Enhanced table visibility */
    table {
        border: 3px solid var(--color-neutral-900);
    }
    
    th, td {
        border: 2px solid var(--color-neutral-900) !important;
        font-weight: var(--font-weight-medium);
    }
    
    th {
        background-color: var(--color-neutral-200) !important;
        font-weight: var(--font-weight-bold);
    }
}

/* Responsive Typography Scale */
.text-responsive-sm {
    font-size: 0.75rem;
    line-height: 1.5;
}

.text-responsive-base {
    font-size: 0.875rem;
    line-height: 1.5;
}

.text-responsive-lg {
    font-size: 1rem;
    line-height: 1.6;
}

.text-responsive-xl {
    font-size: 1.125rem;
    line-height: 1.6;
}

.text-responsive-2xl {
    font-size: 1.25rem;
    line-height: 1.4;
}

@media (min-width: 768px) {
    .text-responsive-sm {
        font-size: 0.875rem;
    }
    
    .text-responsive-base {
        font-size: 1rem;
    }
    
    .text-responsive-lg {
        font-size: 1.125rem;
    }
    
    .text-responsive-xl {
        font-size: 1.25rem;
    }
    
    .text-responsive-2xl {
        font-size: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .text-responsive-sm {
        font-size: 1rem;
    }
    
    .text-responsive-base {
        font-size: 1.125rem;
    }
    
    .text-responsive-lg {
        font-size: 1.25rem;
    }
    
    .text-responsive-xl {
        font-size: 1.5rem;
    }
    
    .text-responsive-2xl {
        font-size: 1.875rem;
    }
}

/* Touch-friendly Features */
.touch-optimized {
    touch-action: manipulation;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

.touch-callout-none {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

.touch-scroll-smooth {
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

/* Responsive Spacing System */
.space-responsive-xs {
    gap: var(--space-1);
}

.space-responsive-sm {
    gap: var(--space-2);
}

.space-responsive-base {
    gap: var(--space-3);
}

.space-responsive-lg {
    gap: var(--space-4);
}

.space-responsive-xl {
    gap: var(--space-6);
}

@media (min-width: 768px) {
    .space-responsive-xs {
        gap: var(--space-2);
    }
    
    .space-responsive-sm {
        gap: var(--space-3);
    }
    
    .space-responsive-base {
        gap: var(--space-4);
    }
    
    .space-responsive-lg {
        gap: var(--space-6);
    }
    
    .space-responsive-xl {
        gap: var(--space-8);
    }
}

/* Enhanced Table Accessibility */
.table-sort-button {
    background: none;
    border: none;
    padding: 0;
    margin: 0;
    font: inherit;
    color: inherit;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    width: 100%;
    text-align: left;
    position: relative;
}

.table-sort-button:hover {
    text-decoration: underline;
}

.table-sort-button:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: -2px;
    border-radius: 2px;
}

.sort-indicator {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 0.25rem;
    vertical-align: middle;
    content: "";
    border-style: solid;
    opacity: 0.5;
}

th[aria-sort="none"] .sort-indicator {
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-bottom: 4px solid currentColor;
}

th[aria-sort="ascending"] .sort-indicator {
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-bottom: 4px solid currentColor;
    opacity: 1;
}

th[aria-sort="descending"] .sort-indicator {
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid currentColor;
    opacity: 1;
}

/* Enhanced table navigation */
table[role="table"] {
    border-collapse: collapse;
    width: 100%;
}

table[role="table"] caption {
    padding: 0.5rem;
    caption-side: top;
    text-align: left;
}

.table-responsive[role="region"]:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Row selection and hover states */
tr[role="row"]:hover {
    background-color: var(--color-neutral-50);
}

tr[role="row"]:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: -2px;
}

tr[role="row"][aria-selected="true"] {
    background-color: var(--color-primary-50);
}

/* Complex data structure styles */
.data-structure-summary {
    position: relative;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
}

.data-structure-details {
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--border-radius-base);
    padding: 1rem;
    margin-top: 0.5rem;
}

/* Mobile table accessibility */
@media (max-width: 767px) {
    .table-mobile-card {
        display: block;
        padding: 1rem;
        border: 1px solid var(--color-neutral-200);
        border-radius: var(--border-radius-base);
        margin-bottom: 0.5rem;
    }
    
    .table-mobile-label {
        font-weight: var(--font-weight-semibold);
        margin-bottom: 0.25rem;
        color: var(--color-neutral-700);
    }
    
    .table-mobile-value {
        margin-bottom: 0.75rem;
    }
}

/* Visual Accessibility Enhancements */

/* Focus indicators with enhanced visibility */
:focus-visible {
    outline: 3px solid var(--color-primary-500) !important;
    outline-offset: 2px !important;
    border-radius: 2px;
}

/* Enhanced button visibility */
.btn {
    border: 2px solid transparent;
    position: relative;
}

.btn:not(.btn-outline) {
    border-color: rgba(0, 0, 0, 0.2);
}

.btn-outline {
    border-color: currentColor;
    border-width: 2px;
}

/* Enhanced form control visibility */
.form-input,
.form-select,
.form-textarea {
    border: 2px solid var(--form-border-default);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--form-border-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Enhanced link visibility */
a {
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 2px;
}

a:hover {
    text-decoration-thickness: 3px;
}

a:focus {
    outline: 3px solid var(--color-primary-500);
    outline-offset: 2px;
    text-decoration: none;
}

/* Status indicators with enhanced visibility */
.status-badge {
    position: relative;
    border: 2px solid currentColor;
    font-weight: var(--font-weight-semibold);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.status-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: currentColor;
    flex-shrink: 0;
}

.status-badge-pending {
    background-color: var(--color-warning-100);
    color: var(--color-warning-700);
    border-color: var(--color-warning-600);
}

.status-badge-approved {
    background-color: var(--color-success-100);
    color: var(--color-success-700);
    border-color: var(--color-success-500);
}

.status-badge-rejected {
    background-color: var(--color-danger-100);
    color: var(--color-danger-700);
    border-color: var(--color-danger-600);
}

.status-badge-translation-needed {
    background-color: var(--color-info-100);
    color: var(--color-info-700);
    border-color: var(--color-primary-500);
}

.status-badge-no-translation-required {
    background-color: var(--color-neutral-100);
    color: var(--color-neutral-700);
    border-color: var(--color-neutral-500);
}

/* Enhanced visibility for interactive elements */
.touch-target {
    min-width: 44px;
    min-height: 44px;
    border: 2px solid var(--color-neutral-300);
    border-radius: 4px;
}

.touch-target:focus {
    outline: 3px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Advanced Accessibility Features */

/* Forced Colors Mode Support (Windows High Contrast) */
@media (forced-colors: active) {
    /* Let the system handle colors, but ensure structure is clear */
    .card {
        border: 2px solid;
        margin: 8px 0;
    }
    
    .btn {
        border: 2px solid;
        forced-color-adjust: none;
    }
    
    .form-input,
    .form-select,
    .form-textarea {
        border: 2px solid;
        forced-color-adjust: none;
    }
    
    /* Ensure icons and decorative elements don't interfere */
    .decorative-icon {
        forced-color-adjust: auto;
    }
    
    /* Status indicators rely on text rather than color */
    .status-badge::before {
        content: "[" attr(data-status) "] ";
        font-weight: bold;
    }
}

/* Motion Sensitivity Support */
@media (prefers-reduced-motion: reduce) {
    /* Comprehensive motion reduction */
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    /* Remove transforms that could cause motion sickness */
    .transform-hover:hover {
        transform: none !important;
    }
    
    /* Provide static alternatives for animated feedback */
    .loading-indicator::after {
        content: "Loading...";
        animation: none !important;
    }
}

/* Enhanced Contrast Support */
@media (prefers-contrast: high) {
    :root {
        /* Ultra-high contrast colors */
        --color-primary-500: #000080;
        --color-danger-500: #8B0000;
        --color-success-500: #006400;
        --color-warning-500: #FF8C00;
        --form-border-default: #000000;
        --form-border-focus: #000080;
    }
    
    /* Enhanced element visibility */
    .btn {
        border-width: 3px;
        font-weight: var(--font-weight-bold);
        text-shadow: 1px 1px 1px rgba(255, 255, 255, 0.5);
    }
    
    .form-input,
    .form-select,
    .form-textarea {
        border-width: 3px;
        font-weight: var(--font-weight-medium);
    }
    
    a {
        text-decoration-thickness: 3px;
        font-weight: var(--font-weight-semibold);
        text-shadow: 1px 1px 1px rgba(255, 255, 255, 0.3);
    }
    
    /* Enhanced focus indicators */
    :focus-visible {
        outline-width: 4px !important;
        outline-offset: 3px !important;
        box-shadow: 0 0 0 8px rgba(0, 0, 128, 0.3);
    }
    
    /* High contrast tables */
    table, th, td {
        border: 2px solid #000000;
    }
    
    th {
        background-color: #f0f0f0;
        font-weight: var(--font-weight-bold);
    }
}

/* Color Blindness Support */
@media (prefers-color-scheme: no-preference) {
    /* Enhanced status indicators for color blind users */
    .status-approved::before {
        content: "✓ ";
        font-weight: bold;
    }
    
    .status-rejected::before {
        content: "✗ ";
        font-weight: bold;
    }
    
    .status-pending::before {
        content: "⏱ ";
        font-weight: bold;
    }
    
    .status-warning::before {
        content: "⚠ ";
        font-weight: bold;
    }
}

/* Transparency Preference Support */
@media (prefers-reduced-transparency: reduce) {
    .modal-overlay,
    .dropdown-overlay {
        background-color: var(--color-neutral-900);
        backdrop-filter: none;
    }
    
    .glass-effect {
        background-color: var(--color-background);
        backdrop-filter: none;
    }
}

/* Data Usage Consideration */
@media (prefers-reduced-data: reduce) {
    /* Disable non-essential background images */
    .hero-background,
    .decorative-image {
        background-image: none;
        background-color: var(--color-neutral-100);
    }
    
    /* Simplify complex gradients */
    .gradient-background {
        background: var(--color-primary-500);
    }
}

/* Advanced Accessibility Utility Classes */

/* Enhanced Screen Reader Support */
.sr-only-focusable {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: 0.5rem 1rem !important;
    margin: 0 !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
    background-color: var(--color-primary-500) !important;
    color: white !important;
    border: 2px solid white !important;
    border-radius: var(--border-radius-base) !important;
    z-index: 10000 !important;
}

/* Live Region Helpers */
.live-region-polite {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.live-region-assertive {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Accessibility State Indicators */
.accessibility-enhanced {
    position: relative;
}

.accessibility-enhanced::after {
    content: "";
    position: absolute;
    top: -2px;
    right: -2px;
    width: 8px;
    height: 8px;
    background-color: var(--color-success-500);
    border-radius: 50%;
    border: 2px solid white;
    opacity: 0;
    transition: opacity 0.2s ease;
}

/* Show accessibility indicator when user has preferences */
@media (prefers-reduced-motion: reduce),
       (prefers-contrast: high),
       (forced-colors: active) {
    .accessibility-enhanced::after {
        opacity: 1;
    }
}

/* Touch Target Helpers */
.touch-target-44 {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.touch-target-48 {
    min-width: 48px;
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Cognitive Load Reduction */
.simplified-layout {
    max-width: 65ch;
    line-height: 1.6;
    margin: 0 auto;
}

.reduced-cognitive-load h1,
.reduced-cognitive-load h2,
.reduced-cognitive-load h3 {
    margin-bottom: 1rem;
    color: var(--color-neutral-900);
}

.reduced-cognitive-load p {
    margin-bottom: 1rem;
    max-width: 70ch;
}

/* High Contrast Theme Toggle Support */
.theme-toggle {
    background: transparent;
    border: 2px solid var(--color-neutral-500);
    border-radius: var(--border-radius-base);
    padding: 0.5rem;
    cursor: pointer;
    position: relative;
}

.theme-toggle:focus-visible {
    outline: 3px solid var(--color-primary-500);
    outline-offset: 2px;
}

.theme-toggle[aria-pressed="true"] {
    background-color: var(--color-primary-500);
    color: white;
    border-color: var(--color-primary-500);
}

/* Motion-Safe Animations */
@media (prefers-reduced-motion: no-preference) {
    .motion-safe-fade {
        opacity: 0;
        animation: fadeInSafe 0.3s ease-out forwards;
    }
    
    @keyframes fadeInSafe {
        to { opacity: 1; }
    }
    
    .motion-safe-slide {
        transform: translateY(10px);
        opacity: 0;
        animation: slideInSafe 0.4s ease-out forwards;
    }
    
    @keyframes slideInSafe {
        to {
            transform: translateY(0);
            opacity: 1;
        }
    }
}

/* Fallback for reduced motion users */
@media (prefers-reduced-motion: reduce) {
    .motion-safe-fade,
    .motion-safe-slide {
        opacity: 1;
        transform: none;
        animation: none;
    }
}

/* Enhanced Error State Indicators */
.error-state {
    border: 2px solid var(--color-danger-500);
    background-color: var(--color-danger-100);
    position: relative;
}

.error-state::before {
    content: "⚠";
    position: absolute;
    left: -30px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-danger-500);
    font-weight: bold;
    font-size: 1.2em;
}

/* Success State Indicators */
.success-state {
    border: 2px solid var(--color-success-500);
    background-color: var(--color-success-100);
    position: relative;
}

.success-state::before {
    content: "✓";
    position: absolute;
    left: -30px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-success-500);
    font-weight: bold;
    font-size: 1.2em;
}

/* Print-friendly Layouts */
@media print {
    .print-hidden {
        display: none !important;
    }
    
    .print-block {
        display: block !important;
    }
    
    .print-break-before {
        page-break-before: always;
    }
    
    .print-break-after {
        page-break-after: always;
    }
    
    .print-break-inside-avoid {
        page-break-inside: avoid;
    }
    
    /* Print optimizations for content */
    .card,
    .dashboard-stats,
    .dashboard-list {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
    
    /* Ensure dark text on white background for printing */
    * {
        color: #000 !important;
        background-color: transparent !important;
    }
    
    .card,
    .btn,
    .form-input {
        background-color: #fff !important;
        border-color: #000 !important;
    }
}

/* Responsive Focus Management */
.focus-visible-enhanced:focus-visible {
    outline: 3px solid var(--color-primary-500);
    outline-offset: 2px;
    box-shadow: 0 0 0 1px var(--color-background);
}

/* Skip to content for accessibility */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary-600);
    color: white;
    padding: 8px;
    border-radius: var(--border-radius-base);
    text-decoration: none;
    z-index: 1000;
    transition: top var(--transition-base);
}

.skip-to-content:focus {
    top: 6px;
}

/* Responsive Overflow Handling */
.overflow-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 767px) {
    .overflow-responsive {
        margin: 0 calc(-1 * var(--space-4));
        padding: 0 var(--space-4);
    }
}

/* Responsive Video Embeds */
.video-responsive {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
}

.video-responsive iframe,
.video-responsive object,
.video-responsive embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Landscape Orientation Optimizations */
@media screen and (orientation: landscape) and (max-height: 600px) {
    .modal-container {
        max-height: 95vh;
    }
    
    .navigation-mobile {
        height: 50px; /* Reduce navigation height in landscape */
    }
    
    .form-group {
        margin-bottom: var(--space-2); /* Tighter spacing */
    }
}

/* Wide Screen Optimizations */
@media (min-width: 1536px) {
    .container {
        max-width: 1400px;
    }
    
    .text-responsive-2xl {
        font-size: 2.25rem;
    }
    
    .dashboard-stats {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Very Large Screen Optimizations */
@media (min-width: 1920px) {
    .container {
        max-width: 1600px;
    }
    
    .dashboard-stats {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* ==========================================================================
   MOBILE PERFORMANCE OPTIMIZATIONS
   ========================================================================== */

/* Performance-optimized Critical CSS */
.critical-path {
    /* Inline critical styles for above-the-fold content */
    font-display: swap;
    contain: layout style paint;
}

/* Efficient Transforms and Animations */
.gpu-accelerated {
    transform: translateZ(0);
    will-change: transform;
    backface-visibility: hidden;
    perspective: 1000;
}

.performance-optimized {
    /* Use transform instead of changing layout properties */
    transform: translate3d(0, 0, 0);
    /* Optimize for mobile GPUs */
    -webkit-transform: translate3d(0, 0, 0);
    /* Avoid layout thrashing */
    contain: layout;
}

/* Lazy Loading Performance */
.lazy-image {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.lazy-image.loaded {
    opacity: 1;
}

.lazy-image-placeholder {
    background-color: var(--color-neutral-100);
    background-image: linear-gradient(
        90deg,
        var(--color-neutral-100) 0%,
        var(--color-neutral-200) 50%,
        var(--color-neutral-100) 100%
    );
    background-size: 200px 100%;
    background-repeat: no-repeat;
    animation: loading-shimmer 1.5s infinite;
}

@keyframes loading-shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

/* Optimized Scrolling Performance */
.smooth-scroll {
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    /* Optimize scroll performance */
    overscroll-behavior: contain;
    scroll-snap-type: y proximity;
}

.scroll-item {
    scroll-snap-align: start;
}

/* Efficient Table Performance for Mobile */
.table-performance-mobile {
    /* Use CSS transforms for better performance */
    transform: translateZ(0);
    /* Enable hardware acceleration */
    will-change: scroll-position;
}

@media (max-width: 767px) {
    .table-performance-mobile {
        /* Optimize for mobile scrolling */
        -webkit-overflow-scrolling: touch;
        overscroll-behavior-x: contain;
        /* Contain paint for better performance */
        contain: paint;
    }
}

/* Memory-efficient Grid Layouts */
.grid-performance {
    /* Use CSS Grid efficiently */
    display: grid;
    contain: layout;
}

@media (max-width: 767px) {
    .grid-performance {
        /* Simpler layout for mobile performance */
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
}

/* Touch Action Optimizations */
.touch-action-optimized {
    /* Disable unused touch actions for better performance */
    touch-action: pan-x pan-y;
    /* Prevent touch delays */
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.touch-action-pan-y {
    touch-action: pan-y;
}

.touch-action-manipulation {
    touch-action: manipulation;
}

/* Font Loading Performance */
@font-face {
    font-family: 'SystemFallback';
    src: local('Arial'), local('Helvetica Neue'), local('sans-serif');
    font-display: fallback;
}

.font-performance {
    font-family: var(--font-family-system);
    font-display: swap;
}

/* Efficient Shadow and Border Optimizations */
.shadow-performance {
    /* Use simpler shadows on mobile for better performance */
    box-shadow: var(--shadow-sm);
}

@media (max-width: 767px) {
    .shadow-performance {
        /* Lighter shadows for mobile performance */
        box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    }
}

/* CSS Containment for Performance */
.contain-layout {
    contain: layout;
}

.contain-paint {
    contain: paint;
}

.contain-size {
    contain: size;
}

.contain-style {
    contain: style;
}

.contain-all {
    contain: layout paint size style;
}

/* Optimized Modal Performance */
.modal-performance {
    /* Use transform for positioning instead of top/left */
    transform: translate(-50%, -50%);
    /* Enable hardware acceleration */
    will-change: transform, opacity;
    /* Contain paint operations */
    contain: paint;
}

@media (max-width: 767px) {
    .modal-performance {
        /* Simpler positioning for mobile */
        transform: none;
        will-change: auto;
    }
}

/* Efficient Animation Performance */
.animate-performance {
    /* Only animate transform and opacity for 60fps */
    transition: transform var(--transition-base), opacity var(--transition-base);
    will-change: transform, opacity;
}

.animate-performance:not(:hover):not(:focus) {
    /* Remove will-change when not needed */
    will-change: auto;
}

/* Mobile-first Loading States */
.loading-state {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.loading-state::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--color-neutral-200);
    border-top: 2px solid var(--color-primary-500);
    border-radius: 50%;
    animation: loading-spin 1s linear infinite;
}

@keyframes loading-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Optimized Image Performance */
.image-performance {
    /* Optimize image rendering */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: optimize-contrast;
    /* Prevent layout shift */
    object-fit: cover;
    /* Enable hardware decoding */
    transform: translateZ(0);
}

@media (max-width: 767px) {
    .image-performance {
        /* Optimize for mobile bandwidth */
        image-rendering: -webkit-optimize-contrast;
    }
}

/* Connection-aware Performance */
@media (max-width: 767px) {
    /* Optimize for slower mobile connections */
    .connection-aware {
        /* Reduce visual complexity */
        box-shadow: none;
        background-image: none;
        /* Simpler transitions */
        transition: opacity var(--transition-fast);
    }
    
    .connection-aware .btn {
        /* Simpler button styles */
        border-radius: var(--border-radius-base);
        box-shadow: none;
    }
    
    .connection-aware .card {
        /* Lighter card styling */
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    }
}

/* Battery-aware Animations */
@media (max-width: 767px) {
    .battery-aware {
        /* Reduce animations for battery life */
        animation-duration: 0.2s;
        transition-duration: 0.15s;
    }
    
    .battery-aware .hover-lift:hover {
        /* Disable expensive hover effects on mobile */
        transform: none;
        box-shadow: var(--shadow-base);
    }
}

/* Memory-efficient Media Queries */
@media (max-width: 767px) and (max-height: 800px) {
    /* Optimize for smaller mobile screens */
    .small-screen-optimized {
        padding: var(--space-2);
        font-size: 0.875rem;
    }
    
    .small-screen-optimized .modal-container {
        max-height: 80vh;
        padding: var(--space-3);
    }
}

/* Network-aware Loading */
.network-optimized {
    /* Progressive enhancement for slow connections */
    background-color: var(--color-neutral-100);
    min-height: 200px;
}

.network-optimized.loaded {
    background-color: transparent;
    min-height: auto;
}

/* Intersection Observer Performance */
.viewport-optimized {
    /* Elements outside viewport get simplified styling */
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.viewport-optimized.in-viewport {
    opacity: 1;
    transform: translateY(0);
}

/* CPU-efficient CSS Grid */
.efficient-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    /* Optimize grid performance */
    contain: layout;
}

@media (max-width: 767px) {
    .efficient-grid {
        /* Single column for mobile performance */
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
}

/* Form Performance Optimizations */
.form-performance input,
.form-performance select,
.form-performance textarea {
    /* Optimize form rendering */
    will-change: auto;
    contain: layout;
}

.form-performance input:focus,
.form-performance select:focus,
.form-performance textarea:focus {
    /* Only use will-change when focused */
    will-change: border-color, box-shadow;
}

.form-performance input:not(:focus),
.form-performance select:not(:focus),
.form-performance textarea:not(:focus) {
    will-change: auto;
}

/* Responsive Asset Loading */
@media (max-width: 767px) {
    .mobile-optimized-assets {
        /* Load smaller assets on mobile */
        background-image: none;
        /* Simpler gradients */
        background: var(--color-background);
    }
}

@media (min-width: 768px) {
    .mobile-optimized-assets {
        /* Full assets on larger screens */
        background-image: linear-gradient(to bottom, var(--color-primary-50), var(--color-background));
    }
}

/* Critical Resource Hints */
.preload-critical {
    /* Add to <head> for critical resources */
    content: 'preload critical CSS and fonts';
}

/* Performance Monitoring Classes */
.perf-monitor {
    /* Classes for performance monitoring tools */
    --start-time: 0;
    --end-time: 0;
}

/* Efficient Flexbox Layouts */
.flex-performance {
    display: flex;
    /* Optimize flex performance */
    contain: layout;
}

@media (max-width: 767px) {
    .flex-performance {
        /* Simpler flex behavior on mobile */
        flex-direction: column;
        gap: var(--space-2);
    }
}

/* =================================
   LOADING STATES & SKELETON SCREENS
   ================================= */

/* Loading Spinner Components */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-neutral-200);
    border-radius: 50%;
    border-top-color: var(--color-primary-500);
    animation: loading-spin 1s ease-in-out infinite;
    vertical-align: middle;
}

.loading-spinner-lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

.loading-spinner-xl {
    width: 48px;
    height: 48px;
    border-width: 4px;
}

/* Loading Animation */
@keyframes loading-spin {
    to {
        transform: rotate(360deg);
    }
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .loading-spinner {
        animation: loading-pulse 1.5s ease-in-out infinite alternate;
    }
    
    @keyframes loading-pulse {
        from {
            opacity: 0.6;
        }
        to {
            opacity: 1;
        }
    }
}

/* Loading States for Buttons */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: loading-spin 1s linear infinite;
}

/* Button loading states respect original colors */
.btn-primary.btn-loading::after {
    border-top-color: white;
}

.btn-secondary.btn-loading::after {
    border-top-color: var(--color-primary-500);
}

.btn-danger.btn-loading::after {
    border-top-color: white;
}

/* Skeleton Screen Base */
.skeleton {
    background: linear-gradient(90deg, var(--color-neutral-100) 25%, var(--color-neutral-200) 50%, var(--color-neutral-100) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    .skeleton {
        animation: skeleton-pulse 1.5s ease-in-out infinite alternate;
    }
    
    @keyframes skeleton-pulse {
        from {
            background-color: var(--color-neutral-100);
        }
        to {
            background-color: var(--color-neutral-200);
        }
    }
}

/* Skeleton Text Elements */
.skeleton-text {
    height: 1rem;
    margin: var(--space-2) 0;
}

.skeleton-text-sm {
    height: 0.875rem;
}

.skeleton-text-lg {
    height: 1.25rem;
}

.skeleton-text-xl {
    height: 1.5rem;
}

/* Variable width text skeletons */
.skeleton-text-75 {
    width: 75%;
}

.skeleton-text-60 {
    width: 60%;
}

.skeleton-text-40 {
    width: 40%;
}

.skeleton-text-25 {
    width: 25%;
}

/* Skeleton Shapes */
.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.skeleton-avatar-lg {
    width: 64px;
    height: 64px;
}

.skeleton-badge {
    width: 60px;
    height: 20px;
    border-radius: 10px;
}

.skeleton-button {
    width: 100px;
    height: 36px;
    border-radius: 6px;
}

.skeleton-button-sm {
    width: 80px;
    height: 32px;
}

.skeleton-button-lg {
    width: 120px;
    height: 44px;
}

/* Table Skeleton Patterns */
.skeleton-table-row {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-neutral-100);
}

.skeleton-table-cell {
    flex: 1;
    height: 1rem;
}

.skeleton-table-cell-sm {
    flex: 0.5;
}

.skeleton-table-cell-lg {
    flex: 2;
}

/* Card Skeleton Patterns */
.skeleton-card {
    padding: var(--space-6);
    background: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: 8px;
    margin-bottom: var(--space-4);
}

.skeleton-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.skeleton-card-content {
    space-y: var(--space-3);
}

.skeleton-card-content > * + * {
    margin-top: var(--space-3);
}

/* Loading Overlay */
.loading-overlay {
    position: relative;
}

.loading-overlay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(248, 250, 252, 0.8);
    backdrop-filter: blur(1px);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-overlay::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 32px;
    height: 32px;
    margin: -16px 0 0 -16px;
    border: 3px solid var(--color-neutral-200);
    border-top-color: var(--color-primary-500);
    border-radius: 50%;
    animation: loading-spin 1s linear infinite;
    z-index: 11;
}

/* Dark Mode Loading States */
[data-theme="dark"] .loading-spinner {
    border-color: var(--color-neutral-700);
    border-top-color: var(--color-primary-400);
}

[data-theme="dark"] .skeleton {
    background: linear-gradient(90deg, rgba(71, 85, 105, 0.5) 25%, rgba(100, 116, 139, 0.5) 50%, rgba(71, 85, 105, 0.5) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

[data-theme="dark"] .loading-overlay::before {
    background: rgba(15, 23, 42, 0.8);
}

[data-theme="dark"] .loading-overlay::after {
    border-color: var(--color-neutral-700);
    border-top-color: var(--color-primary-400);
}

/* Progressive Loading States */
.progressive-loading {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.progressive-loading.loaded {
    opacity: 1;
}

/* Loading State for Forms */
.form-loading {
    pointer-events: none;
    opacity: 0.7;
}

.form-loading .form-control {
    background-color: var(--color-neutral-50);
    cursor: not-allowed;
}

.form-loading .form-control:focus {
    box-shadow: none;
    border-color: var(--color-neutral-300);
}

/* Screen Reader Loading Announcements */
.loading-status {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Mobile-specific Loading Optimizations */
@media (max-width: 767px) {
    .skeleton-table-row {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .skeleton-table-cell {
        flex: none;
        width: 100%;
    }
    
    .skeleton-card {
        padding: var(--space-4);
        margin-bottom: var(--space-3);
    }
    
    .loading-spinner-xl {
        width: 32px;
        height: 32px;
        border-width: 3px;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .skeleton {
        background: repeating-linear-gradient(
            90deg,
            transparent,
            transparent 10px,
            currentColor 10px,
            currentColor 11px
        );
        color: var(--color-neutral-500);
    }
    
    .loading-spinner {
        border-color: currentColor;
        border-top-color: var(--color-primary-500);
    }
}

/* Loading States Utilities */
.loading-fade-in {
    animation: fade-in 0.3s ease-in-out;
}

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Content Loading States */
.content-loading .skeleton {
    margin-bottom: var(--space-3);
}

.content-loading .skeleton:last-child {
    margin-bottom: 0;
}

/* Loading Performance Optimization */
.skeleton,
.loading-spinner {
    will-change: auto;
    contain: layout;
}

/* Touch Device Loading Feedback */
@media (hover: none) {
    .btn-loading {
        opacity: 0.8;
    }
    
    .loading-overlay::before {
        background: rgba(248, 250, 252, 0.9);
    }
}

/* =================================
   USER FEEDBACK SYSTEM - TOASTS, ALERTS & NOTIFICATIONS
   ================================= */

/* Notification Container */
.notification-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    pointer-events: none;
    max-width: 400px;
    width: 100%;
}

@media (max-width: 767px) {
    .notification-container {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
    }
}

/* Toast Base Styles */
.toast {
    background: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    margin-bottom: 12px;
    padding: 16px;
    pointer-events: auto;
    position: relative;
    transform: translateX(100%);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    max-width: 100%;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast.hide {
    transform: translateX(100%);
    opacity: 0;
    margin-bottom: 0;
    padding-top: 0;
    padding-bottom: 0;
    height: 0;
    overflow: hidden;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    .toast {
        transform: none;
        transition: opacity 0.3s ease;
    }
    
    .toast.show {
        opacity: 1;
    }
    
    .toast.hide {
        opacity: 0;
    }
}

/* Toast Types */
.toast-success {
    border-left: 4px solid var(--color-success-500);
    background: var(--color-success-100);
}

.toast-error {
    border-left: 4px solid var(--color-danger-500);
    background: var(--color-danger-100);
}

.toast-warning {
    border-left: 4px solid var(--color-warning-500);
    background: var(--color-warning-100);
}

.toast-info {
    border-left: 4px solid var(--color-primary-500);
    background: var(--color-info-100);
}

/* Toast Content */
.toast-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.toast-title {
    font-weight: 600;
    margin: 0;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.toast-success .toast-title {
    color: var(--color-success-700);
}

.toast-error .toast-title {
    color: var(--color-danger-700);
}

.toast-warning .toast-title {
    color: var(--color-warning-700);
}

.toast-info .toast-title {
    color: var(--color-info-700);
}

.toast-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-neutral-500);
    transition: all 0.2s ease;
}

.toast-close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--color-neutral-700);
}

.toast-close:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.toast-message {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--color-neutral-700);
}

.toast-actions {
    margin-top: 12px;
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

.toast-action {
    background: none;
    border: 1px solid var(--color-neutral-300);
    border-radius: 4px;
    padding: 6px 12px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.toast-action:hover {
    background: var(--color-neutral-50);
}

.toast-action.primary {
    background: var(--color-primary-500);
    border-color: var(--color-primary-500);
    color: white;
}

.toast-action.primary:hover {
    background: var(--color-primary-600);
}

/* Toast Icons */
.toast-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Progress Bar for Auto-dismiss */
.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 0 0 8px 8px;
    transform-origin: left;
    animation: toast-progress var(--duration, 5s) linear forwards;
}

.toast-success .toast-progress {
    background: var(--color-success-500);
}

.toast-error .toast-progress {
    background: var(--color-danger-500);
}

.toast-warning .toast-progress {
    background: var(--color-warning-500);
}

.toast-info .toast-progress {
    background: var(--color-primary-500);
}

@keyframes toast-progress {
    from {
        transform: scaleX(1);
    }
    to {
        transform: scaleX(0);
    }
}

/* Pause progress on hover */
.toast:hover .toast-progress {
    animation-play-state: paused;
}

/* Alert System */
.alert {
    border-radius: 6px;
    padding: 12px 16px;
    margin: 16px 0;
    position: relative;
    border: 1px solid transparent;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.alert-dismissible {
    padding-right: 50px;
}

.alert-success {
    background: var(--color-success-100);
    border-color: var(--color-success-500);
    color: var(--color-success-700);
}

.alert-error {
    background: var(--color-danger-100);
    border-color: var(--color-danger-500);
    color: var(--color-danger-700);
}

.alert-warning {
    background: var(--color-warning-100);
    border-color: var(--color-warning-500);
    color: var(--color-warning-700);
}

.alert-info {
    background: var(--color-info-100);
    border-color: var(--color-primary-500);
    color: var(--color-info-700);
}

.alert-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: 600;
    margin: 0 0 4px 0;
    font-size: 0.875rem;
}

.alert-message {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

.alert-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    color: inherit;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.alert-close:hover {
    opacity: 1;
}

.alert-close:focus {
    outline: 2px solid currentColor;
    outline-offset: 2px;
}

/* Notification System Status Indicators */
.notification-status {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1001;
    pointer-events: none;
}

.status-indicator {
    background: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: 20px;
    padding: 8px 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    transform: translateY(-100%);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
}

.status-indicator.show {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

.status-indicator-success {
    color: var(--color-success-700);
    border-color: var(--color-success-500);
    background: var(--color-success-100);
}

.status-indicator-error {
    color: var(--color-danger-700);
    border-color: var(--color-danger-500);
    background: var(--color-danger-100);
}

.status-indicator-warning {
    color: var(--color-warning-700);
    border-color: var(--color-warning-500);
    background: var(--color-warning-100);
}

.status-indicator-info {
    color: var(--color-info-700);
    border-color: var(--color-primary-500);
    background: var(--color-info-100);
}

.status-icon {
    width: 16px;
    height: 16px;
    animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.1);
    }
}

/* Confirmation Dialogs */
.confirmation-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1002;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.confirmation-overlay.show {
    opacity: 1;
    visibility: visible;
}

.confirmation-dialog {
    background: var(--color-background);
    border-radius: 8px;
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    width: 90%;
    padding: 24px;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.confirmation-overlay.show .confirmation-dialog {
    transform: scale(1);
}

.confirmation-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.confirmation-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.confirmation-title {
    font-weight: 600;
    margin: 0;
    font-size: 1rem;
    color: var(--color-neutral-900);
}

.confirmation-message {
    margin: 0 0 20px 0;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--color-neutral-700);
}

.confirmation-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.confirmation-button {
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid var(--color-neutral-300);
    background: var(--color-background);
    color: var(--color-neutral-700);
}

.confirmation-button:hover {
    background: var(--color-neutral-50);
}

.confirmation-button.primary {
    background: var(--color-primary-500);
    border-color: var(--color-primary-500);
    color: white;
}

.confirmation-button.primary:hover {
    background: var(--color-primary-600);
}

.confirmation-button.danger {
    background: var(--color-danger-500);
    border-color: var(--color-danger-500);
    color: white;
}

.confirmation-button.danger:hover {
    background: var(--color-danger-600);
}

/* Dark Mode Support */
[data-theme="dark"] .toast {
    background: #1e293b;
    border-color: #475569;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .toast {
        background: #1e293b;
        border-color: #475569;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    }
    
    :root:not([data-theme="light"]) .toast-message {
        color: #f1f5f9;
    }
    
    :root:not([data-theme="light"]) .toast-info {
        background: #1e293b;
        border-left-color: #3b82f6;
    }
    
    :root:not([data-theme="light"]) .toast-info .toast-title {
        color: #3b82f6;
    }
    
    :root:not([data-theme="light"]) .toast-success {
        background: #1e293b;
        border-left-color: #22c55e;
    }
    
    :root:not([data-theme="light"]) .toast-success .toast-title {
        color: #22c55e;
    }
    
    :root:not([data-theme="light"]) .toast-error {
        background: #1e293b;
        border-left-color: #ef4444;
    }
    
    :root:not([data-theme="light"]) .toast-error .toast-title {
        color: #ef4444;
    }
    
    :root:not([data-theme="light"]) .toast-warning {
        background: #1e293b;
        border-left-color: #f59e0b;
    }
    
    :root:not([data-theme="light"]) .toast-warning .toast-title {
        color: #f59e0b;
    }
}

[data-theme="dark"] .toast-message {
    color: #f1f5f9;
}

/* Dark mode toast type backgrounds */
[data-theme="dark"] .toast-success {
    background: #1e293b;
    border-left-color: #22c55e;
}

[data-theme="dark"] .toast-success .toast-title {
    color: #22c55e;
}

[data-theme="dark"] .toast-error {
    background: #1e293b;
    border-left-color: #ef4444;
}

[data-theme="dark"] .toast-error .toast-title {
    color: #ef4444;
}

[data-theme="dark"] .toast-warning {
    background: #1e293b;
    border-left-color: #f59e0b;
}

[data-theme="dark"] .toast-warning .toast-title {
    color: #f59e0b;
}

[data-theme="dark"] .toast-info {
    background: #1e293b;
    border-left-color: #3b82f6;
}

[data-theme="dark"] .toast-info .toast-title {
    color: #3b82f6;
}

[data-theme="dark"] .alert {
    background: var(--color-neutral-800);
    border-color: var(--color-neutral-700);
    color: var(--color-neutral-100);
}

[data-theme="dark"] .confirmation-dialog {
    background: var(--color-neutral-800);
    border: 1px solid var(--color-neutral-700);
}

[data-theme="dark"] .confirmation-title {
    color: var(--color-neutral-100);
}

[data-theme="dark"] .confirmation-message {
    color: var(--color-neutral-300);
}

/* High Contrast Support */
@media (prefers-contrast: high) {
    .toast {
        border-width: 2px;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    }
    
    .alert {
        border-width: 2px;
    }
    
    .toast-close,
    .alert-close {
        border: 1px solid currentColor;
    }
}

/* Screen Reader Enhancements */
.notification-sr-only {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Focus Management */
.toast:focus-within {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.alert:focus-within {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Mobile Optimizations */
@media (max-width: 767px) {
    .toast {
        margin-bottom: 8px;
        padding: 12px;
    }
    
    .alert {
        padding: 10px 12px;
        margin: 12px 0;
    }
    
    .confirmation-dialog {
        padding: 20px;
        width: 95%;
    }
    
    .confirmation-actions {
        flex-direction: column-reverse;
    }
    
    .confirmation-button {
        width: 100%;
        justify-content: center;
    }
}

/* Performance Optimizations */
.toast,
.alert,
.confirmation-dialog {
    will-change: auto;
    contain: layout;
}

/* Animation Performance */
@media (prefers-reduced-motion: no-preference) {
    .toast,
    .status-indicator,
    .confirmation-overlay {
        backface-visibility: hidden;
        perspective: 1000px;
    }
}

/* ========================================
   Form Validation Enhancement System
   Phase 6.2 Phase 4 - ux-3
   ======================================== */

/* Enhanced Form Validation States */
.form-field {
    position: relative;
    margin-bottom: var(--space-4);
}

.form-field.form-field-lg {
    margin-bottom: var(--space-6);
}

.form-field.form-field-sm {
    margin-bottom: var(--space-3);
}

/* Validation State Indicators */
.form-input.validating {
    border-color: var(--color-info-500);
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24'%3E%3Cpath stroke='%233b82f6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M12 2v20M17 5H9.5a3.5 3.5 0 0 0 0 7h5a3.5 3.5 0 0 1 0 7H6'/%3E%3C/svg%3E");
    background-position: right var(--space-3) center;
    background-repeat: no-repeat;
    background-size: 16px 16px;
    padding-right: calc(var(--space-4) + 24px);
}

.form-input.valid {
    border-color: var(--color-success-500);
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24'%3E%3Cpath stroke='%23047857' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M20 6L9 17l-5-5'/%3E%3C/svg%3E");
    background-position: right var(--space-3) center;
    background-repeat: no-repeat;
    background-size: 16px 16px;
    padding-right: calc(var(--space-4) + 24px);
}

.form-input.invalid {
    border-color: var(--color-danger-500);
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24'%3E%3Cpath stroke='%23ef4444' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M18 6L6 18M6 6l12 12'/%3E%3C/svg%3E");
    background-position: right var(--space-3) center;
    background-repeat: no-repeat;
    background-size: 16px 16px;
    padding-right: calc(var(--space-4) + 24px);
}

.form-input.warning {
    border-color: var(--color-warning-500);
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24'%3E%3Cpath stroke='%23b45309' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z'/%3E%3C/svg%3E");
    background-position: right var(--space-3) center;
    background-repeat: no-repeat;
    background-size: 16px 16px;
    padding-right: calc(var(--space-4) + 24px);
}

/* Enhanced validation feedback messages */
.form-validation-message {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    margin-top: var(--space-2);
    font-size: var(--form-input-font-size-sm);
    line-height: 1.4;
    opacity: 0;
    transform: translateY(-4px);
    transition: all var(--transition-fast) ease-in-out;
}

.form-validation-message.show {
    opacity: 1;
    transform: translateY(0);
}

.form-validation-message.error {
    color: var(--color-danger-500);
}

.form-validation-message.success {
    color: var(--color-success-500);
}

.form-validation-message.warning {
    color: var(--color-warning-500);
}

.form-validation-message.info {
    color: var(--color-info-700);
}

.form-validation-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 1px;
}

/* Real-time validation animations */
.form-input.validating {
    animation: form-validate-pulse 1.5s ease-in-out infinite;
}

@keyframes form-validate-pulse {
    0%, 100% { border-color: var(--color-info-500); }
    50% { border-color: var(--color-info-700); }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .form-input.validating {
        animation: none;
        border-color: var(--color-info-500);
    }
    
    .form-validation-message {
        transition: opacity var(--transition-fast) ease-in-out;
        transform: none;
    }
    
    .form-validation-message.show {
        transform: none;
    }
}

/* Password Strength Meter */
.password-strength-meter {
    margin-top: var(--space-2);
    height: 4px;
    border-radius: 2px;
    background-color: var(--color-neutral-200);
    overflow: hidden;
    position: relative;
}

.password-strength-meter.hidden {
    display: none;
}

.password-strength-fill {
    height: 100%;
    border-radius: 2px;
    transition: all var(--transition-base) ease-in-out;
    transform-origin: left;
}

.password-strength-fill.weak {
    width: 25%;
    background-color: var(--color-danger-500);
}

.password-strength-fill.fair {
    width: 50%;
    background-color: var(--color-warning-500);
}

.password-strength-fill.good {
    width: 75%;
    background-color: var(--color-info-500);
}

.password-strength-fill.strong {
    width: 100%;
    background-color: var(--color-success-500);
}

.password-strength-text {
    margin-top: var(--space-1);
    font-size: var(--form-input-font-size-sm);
    color: var(--color-neutral-600);
}

/* Character Counter */
.character-counter {
    display: flex;
    justify-content: flex-end;
    margin-top: var(--space-1);
    font-size: var(--form-input-font-size-sm);
    color: var(--color-neutral-500);
}

.character-counter.warning {
    color: var(--color-warning-500);
}

.character-counter.error {
    color: var(--color-danger-500);
}

/* Form Progress Indicator */
.form-progress {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-background);
    border-bottom: 1px solid var(--color-neutral-200);
    padding: var(--space-3) 0;
    margin-bottom: var(--space-4);
}

.form-progress-bar {
    height: 4px;
    background-color: var(--color-neutral-200);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: var(--space-2);
}

.form-progress-fill {
    height: 100%;
    background-color: var(--color-primary-500);
    border-radius: 2px;
    transition: width var(--transition-base) ease-in-out;
    transform-origin: left;
}

.form-progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--form-input-font-size-sm);
    color: var(--color-neutral-600);
}

.form-progress-text .progress-label {
    font-weight: var(--font-weight-medium);
}

.form-progress-text .progress-percentage {
    color: var(--color-neutral-500);
}

/* Validation Summary */
.validation-summary {
    background: var(--color-danger-50);
    border: 1px solid var(--color-danger-200);
    border-radius: var(--border-radius-md);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
}

.validation-summary.hidden {
    display: none;
}

.validation-summary-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
    font-weight: var(--font-weight-semibold);
    color: var(--color-danger-700);
}

.validation-summary-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.validation-summary-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.validation-summary-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
    font-size: var(--form-input-font-size-sm);
    color: var(--color-danger-600);
}

.validation-summary-item:last-child {
    margin-bottom: 0;
}

.validation-summary-item-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 1px;
}

.validation-summary-item button {
    background: none;
    border: none;
    color: var(--color-danger-700);
    text-decoration: underline;
    cursor: pointer;
    font-size: inherit;
    padding: 0;
    margin: 0;
}

.validation-summary-item button:hover {
    color: var(--color-danger-800);
}

.validation-summary-item button:focus {
    outline: 2px solid var(--color-danger-500);
    outline-offset: 2px;
    border-radius: var(--border-radius-sm);
}

/* Auto-save Indicator */
.auto-save-indicator {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--border-radius-md);
    padding: var(--space-2) var(--space-3);
    font-size: var(--form-input-font-size-sm);
    color: var(--color-neutral-600);
    box-shadow: var(--shadow-base);
    z-index: 1000;
    opacity: 0;
    transform: translateY(-8px);
    transition: all var(--transition-base) ease-in-out;
}

.auto-save-indicator.show {
    opacity: 1;
    transform: translateY(0);
}

.auto-save-indicator.saving {
    color: var(--color-info-700);
}

.auto-save-indicator.saved {
    color: var(--color-success-600);
}

.auto-save-indicator.error {
    color: var(--color-danger-500);
}

.auto-save-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid var(--color-neutral-200);
    border-radius: 50%;
    border-top-color: var(--color-info-500);
    animation: auto-save-spin 1s linear infinite;
}

@keyframes auto-save-spin {
    to { transform: rotate(360deg); }
}

/* Mobile Responsive Adjustments */
@media (max-width: 640px) {
    .form-progress {
        position: static;
        margin-bottom: var(--space-3);
    }
    
    .auto-save-indicator {
        position: static;
        margin-bottom: var(--space-3);
        justify-content: center;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .form-input.valid {
        border-color: #000;
        background-color: #e6f7e6;
    }
    
    .form-input.invalid {
        border-color: #000;
        background-color: #ffe6e6;
    }
    
    .form-input.warning {
        border-color: #000;
        background-color: #fff8e6;
    }
    
    .password-strength-fill {
        border: 1px solid #000;
    }
    
    .form-progress-fill {
        border: 1px solid #000;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .validation-summary {
        background: rgba(239, 68, 68, 0.1);
        border-color: rgba(239, 68, 68, 0.3);
    }
    
    .auto-save-indicator {
        background: var(--color-neutral-800);
        border-color: var(--color-neutral-700);
    }
    
    .form-progress {
        background: var(--color-neutral-800);
        border-color: var(--color-neutral-700);
    }
}

/* Print Styles */
@media print {
    .form-progress,
    .auto-save-indicator,
    .password-strength-meter {
        display: none !important;
    }
    
    .form-input.valid,
    .form-input.invalid,
    .form-input.warning {
        background-image: none !important;
        border-color: var(--color-neutral-400) !important;
    }
}

/* =======================================
   MICRO-INTERACTIONS & ANIMATIONS SYSTEM
   Phase 6.2 Phase 4 - ux-4
   ======================================= */

/* Animation Design Tokens */
:root {
    /* Animation Timing */
    --animation-duration-fast: 150ms;
    --animation-duration-base: 200ms;
    --animation-duration-slow: 300ms;
    --animation-duration-slower: 400ms;
    
    /* Animation Easing Functions */
    --animation-ease-out: cubic-bezier(0.0, 0.0, 0.2, 1);
    --animation-ease-in: cubic-bezier(0.4, 0.0, 1, 1);
    --animation-ease-in-out: cubic-bezier(0.4, 0.0, 0.2, 1);
    --animation-ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --animation-ease-back: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    
    /* Animation Distances */
    --animation-distance-xs: 4px;
    --animation-distance-sm: 8px;
    --animation-distance-base: 16px;
    --animation-distance-lg: 24px;
    
    /* Animation Scales */
    --animation-scale-xs: 0.95;
    --animation-scale-sm: 0.97;
    --animation-scale-lg: 1.05;
    --animation-scale-xl: 1.1;
    
    /* Animation Rotations */
    --animation-rotate-xs: 2deg;
    --animation-rotate-sm: 5deg;
    --animation-rotate-base: 15deg;
    --animation-rotate-lg: 45deg;
    
    /* Shadow Elevations for Animations */
    --shadow-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-active: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-lift: 0 10px 25px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Core Animation Utilities */
.animate-fade-in {
    animation: fadeIn var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.animate-fade-out {
    animation: fadeOut var(--animation-duration-base) var(--animation-ease-in) forwards;
}

.animate-slide-in-up {
    animation: slideInUp var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.animate-slide-in-down {
    animation: slideInDown var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.animate-slide-in-left {
    animation: slideInLeft var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.animate-slide-in-right {
    animation: slideInRight var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.animate-scale-in {
    animation: scaleIn var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.animate-scale-out {
    animation: scaleOut var(--animation-duration-base) var(--animation-ease-in) forwards;
}

.animate-bounce-in {
    animation: bounceIn var(--animation-duration-slow) var(--animation-ease-bounce) forwards;
}

.animate-pulse {
    animation: pulse 2s var(--animation-ease-in-out) infinite;
}

.animate-shake {
    animation: shake var(--animation-duration-slower) var(--animation-ease-in-out);
}

/* Core Keyframe Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(var(--animation-distance-base));
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(calc(-1 * var(--animation-distance-base)));
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(calc(-1 * var(--animation-distance-base)));
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(var(--animation-distance-base));
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(var(--animation-scale-xs));
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes scaleOut {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(var(--animation-scale-xs));
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale3d(0.3, 0.3, 0.3);
    }
    20% {
        transform: scale3d(1.1, 1.1, 1.1);
    }
    40% {
        transform: scale3d(0.9, 0.9, 0.9);
    }
    60% {
        opacity: 1;
        transform: scale3d(1.03, 1.03, 1.03);
    }
    80% {
        transform: scale3d(0.97, 0.97, 0.97);
    }
    100% {
        opacity: 1;
        transform: scale3d(1, 1, 1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-10px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(10px);
    }
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Enhanced Button Animations */
.btn {
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width var(--animation-duration-slow) var(--animation-ease-out), 
                height var(--animation-duration-slow) var(--animation-ease-out);
    pointer-events: none;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-active);
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn:focus {
    transform: translateY(-1px);
    box-shadow: var(--shadow-focus), var(--shadow-hover);
}

/* Button Loading Animation Enhancement */
.btn-loading {
    pointer-events: none;
    position: relative;
}

.btn-loading::after {
    animation: spin var(--animation-duration-base) linear infinite;
}

/* Hover Effects for Interactive Elements */
.hover-lift {
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
}

.hover-lift:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.hover-lift:active {
    transform: translateY(0);
    box-shadow: var(--shadow-base);
}

.hover-scale {
    transition: transform var(--animation-duration-fast) var(--animation-ease-out);
}

.hover-scale:hover {
    transform: scale(var(--animation-scale-lg));
}

.hover-scale:active {
    transform: scale(var(--animation-scale-sm));
}

.hover-float {
    transition: all var(--animation-duration-base) var(--animation-ease-out);
}

.hover-float:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lift);
}

.hover-glow {
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
    position: relative;
    overflow: visible !important;
}

.hover-glow::after {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    background: linear-gradient(45deg, var(--color-primary-500), rgba(37, 99, 235, 0.3), var(--color-primary-500));
    border-radius: inherit;
    z-index: -1;
    opacity: 0;
    transition: opacity var(--animation-duration-fast) var(--animation-ease-out);
    pointer-events: none;
}

.hover-glow:hover::after {
    opacity: 0.7;
}

/* Form Animation Enhancements */
.form-input {
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
}



/* Floating Label Animation */
.form-group-floating {
    position: relative;
    margin-bottom: calc(var(--form-group-spacing) + 0.5rem);
}

.form-group-floating .form-label {
    position: absolute;
    top: 50%;
    left: var(--space-3);
    transform: translateY(-50%);
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
    pointer-events: none;
    background: var(--color-background);
    padding: 0 var(--space-1);
    color: var(--color-neutral-500);
    margin-bottom: 0;
}

.form-group-floating .form-input:focus + .form-label,
.form-group-floating .form-input:not(:placeholder-shown) + .form-label {
    top: 0;
    left: var(--space-2);
    transform: translateY(-50%) scale(0.85);
    color: var(--color-primary-500);
}

/* Card Animations */
.card {
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
}

.card-hover {
    cursor: pointer;
    transition: all var(--animation-duration-base) var(--animation-ease-out);
}

.card-hover:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 20px 40px -8px rgba(0, 0, 0, 0.15), 0 8px 16px -4px rgba(0, 0, 0, 0.1);
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.05), transparent);
}

[data-theme="dark"] .card-hover:hover {
    box-shadow: 0 20px 40px -8px rgba(0, 0, 0, 0.5), 0 8px 16px -4px rgba(0, 0, 0, 0.3);
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.08), transparent);
}

.card-hover:active {
    transform: translateY(0);
    box-shadow: var(--shadow-active);
}

/* Modal Animations */
.modal-overlay {
    transition: all var(--animation-duration-base) var(--animation-ease-out);
}

.modal-overlay.entering {
    opacity: 0;
}

.modal-overlay.entered {
    opacity: 1;
}

.modal-overlay.exiting {
    opacity: 0;
}

.modal-content {
    transition: all var(--animation-duration-base) var(--animation-ease-out);
}

.modal-overlay.entering .modal-content {
    opacity: 0;
    transform: scale(var(--animation-scale-xs)) translateY(-10px);
}

.modal-overlay.entered .modal-content {
    opacity: 1;
    transform: scale(1) translateY(0);
}

.modal-overlay.exiting .modal-content {
    opacity: 0;
    transform: scale(var(--animation-scale-xs)) translateY(-10px);
}

/* Navigation Animations */
.nav-link {
    position: relative;
    transition: color var(--animation-duration-fast) var(--animation-ease-out);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary-500);
    transform: scaleX(0);
    transition: transform var(--animation-duration-fast) var(--animation-ease-out);
    transform-origin: left;
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}

.nav-link:hover {
    color: var(--color-primary-500);
}

/* Dropdown Animations */
.dropdown-menu {
    opacity: 0;
    transform: translateY(-var(--animation-distance-sm)) scale(var(--animation-scale-sm));
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
    transform-origin: top;
}

.dropdown-menu.open {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.dropdown-item {
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
}

.dropdown-item:hover {
    background-color: var(--color-primary-50);
    transform: translateX(var(--animation-distance-xs));
}

/* Loading State Animations */
.loading-dots {
    display: inline-flex;
    gap: 2px;
    align-items: center;
}

.loading-dots::before,
.loading-dots::after {
    content: '';
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: currentColor;
    animation: loadingDots 1.4s ease-in-out infinite both;
}

.loading-dots::before {
    animation-delay: -0.32s;
}

.loading-dots::after {
    animation-delay: -0.16s;
}

@keyframes loadingDots {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Ripple Effect */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width var(--animation-duration-slow) var(--animation-ease-out),
                height var(--animation-duration-slow) var(--animation-ease-out),
                opacity var(--animation-duration-slow) var(--animation-ease-out);
}

.ripple:active::before {
    width: 200px;
    height: 200px;
    opacity: 0;
}

/* Stagger Animation Utilities */
.stagger-fade-in > * {
    opacity: 0;
    animation: fadeIn var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.stagger-fade-in > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-fade-in > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-fade-in > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-fade-in > *:nth-child(4) { animation-delay: 0.4s; }
.stagger-fade-in > *:nth-child(5) { animation-delay: 0.5s; }
.stagger-fade-in > *:nth-child(6) { animation-delay: 0.6s; }

.stagger-slide-up > * {
    opacity: 0;
    transform: translateY(var(--animation-distance-base));
    animation: slideInUp var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.stagger-slide-up > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-slide-up > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-slide-up > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-slide-up > *:nth-child(4) { animation-delay: 0.4s; }
.stagger-slide-up > *:nth-child(5) { animation-delay: 0.5s; }
.stagger-slide-up > *:nth-child(6) { animation-delay: 0.6s; }

/* Notification Animation Enhancements */
.toast {
    animation: toastSlideIn var(--animation-duration-base) var(--animation-ease-out) forwards;
}

.toast.removing {
    animation: toastSlideOut var(--animation-duration-base) var(--animation-ease-in) forwards;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastSlideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* Badge and Status Animations */
.badge {
    transition: all var(--animation-duration-fast) var(--animation-ease-out);
}

.badge:hover {
    transform: scale(var(--animation-scale-lg));
}

.status-indicator.animated {
    animation: statusPulse 2s var(--animation-ease-in-out) infinite;
}

@keyframes statusPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

/* Progress Animation */
.progress-bar {
    transition: width var(--animation-duration-slow) var(--animation-ease-out);
}

.progress-indeterminate {
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--color-primary-500) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: progressIndeterminate 1.5s linear infinite;
}

@keyframes progressIndeterminate {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Accessibility and Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .animate-pulse,
    .status-indicator.animated,
    .loading-dots::before,
    .loading-dots::after {
        animation: none;
    }
    
    .btn:hover,
    .hover-lift:hover,
    .hover-scale:hover,
    .hover-float:hover,
    .card-hover:hover {
        transform: none;
        box-shadow: var(--shadow-base);
    }
    
    .progress-indeterminate {
        animation: none;
        background: var(--color-primary-500);
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .btn:hover,
    .btn:focus {
        outline: 2px solid currentColor;
        outline-offset: 2px;
    }
    
    .hover-glow::before {
        display: none;
    }
    
    .nav-link::after {
        height: 3px;
        background: currentColor;
    }
}

/* Dark Mode Enhancements */
[data-theme="dark"] .btn::before {
    background: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .hover-glow::after {
    background: linear-gradient(45deg, #60a5fa, rgba(147, 197, 253, 0.6), #60a5fa);
    box-shadow: 0 0 20px rgba(96, 165, 250, 0.5);
}

[data-theme="dark"] .hover-glow:hover::after {
    opacity: 1;
}

[data-theme="dark"] .form-group-floating .form-label {
    background: #1e293b;
}

[data-theme="dark"] .dropdown-item:hover {
    background-color: var(--color-neutral-700);
}

[data-theme="dark"] .user-menu-button {
    color: var(--color-neutral-500); /* #94a3b8 - light gray */
}

[data-theme="dark"] .user-menu-button:hover {
    color: var(--color-neutral-900); /* #f1f5f9 - almost white */
}

/* Performance Optimizations */
.btn,
.card,
.form-input,
.modal-content,
.dropdown-menu {
    will-change: auto;
    backface-visibility: hidden;
}

.btn:hover,
.btn:focus,
.btn:active,
.card-hover:hover,
.form-input:focus,
.modal-overlay.entering .modal-content,
.modal-overlay.entered .modal-content,
.dropdown-menu.open {
    will-change: transform, opacity, box-shadow;
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn:hover,
    .hover-lift:hover,
    .hover-scale:hover,
    .hover-float:hover,
    .card-hover:hover,
    .nav-link:hover,
    .dropdown-item:hover {
        transform: none;
        box-shadow: var(--shadow-base);
    }
    
    .btn:active,
    .hover-lift:active,
    .hover-scale:active,
    .card-hover:active {
        transform: scale(var(--animation-scale-sm));
    }
}

/* Intersection Observer Animation Classes */
.observe-fade {
    opacity: 0;
    transition: opacity var(--animation-duration-slow) var(--animation-ease-out);
}

.observe-fade.in-view {
    opacity: 1;
}

.observe-slide-up {
    opacity: 0;
    transform: translateY(var(--animation-distance-lg));
    transition: all var(--animation-duration-slow) var(--animation-ease-out);
}

.observe-slide-up.in-view {
    opacity: 1;
    transform: translateY(0);
}

.observe-scale {
    opacity: 0;
    transform: scale(var(--animation-scale-xs));
    transition: all var(--animation-duration-slow) var(--animation-ease-out);
}

.observe-scale.in-view {
    opacity: 1;
    transform: scale(1);
}

/* ==========================================
   Progressive Enhancement & CSS-Only Fallbacks
   Phase 6.2 Phase 4: ux-5
   ========================================== */

/* No-JS Fallback Styles */
.no-js {
    /* Ensure content is visible without JavaScript */
}

.no-js .js-only {
    display: none !important;
}

.no-js .no-js-hide {
    display: none !important;
}

.no-js .no-js-show {
    display: block !important;
}

/* CSS-Only Dark Mode Toggle (Checkbox Hack) */
.theme-toggle-fallback {
    display: none;
}

.no-js .theme-toggle-fallback {
    display: block;
    position: relative;
}

.theme-toggle-checkbox {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.theme-toggle-label {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: var(--radius-md);
    background: var(--color-neutral-100);
    transition: background var(--animation-duration-base) ease;
}

.theme-toggle-checkbox:checked ~ .theme-toggle-label {
    background: var(--color-neutral-800);
    color: var(--color-neutral-100);
}

.theme-toggle-checkbox:focus-visible ~ .theme-toggle-label {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* CSS-Only Dropdown (Hover/Focus) */
.progressive-dropdown {
    position: relative;
}

.no-js .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    min-width: 10rem;
    background: var(--color-background);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(-0.5rem);
    transition: opacity var(--animation-duration-base) ease,
                transform var(--animation-duration-base) ease;
}

.no-js .progressive-dropdown:hover .dropdown-menu,
.no-js .progressive-dropdown:focus-within .dropdown-menu {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* Ensure keyboard navigation works */
.no-js .dropdown-menu:focus-within {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* CSS-Only Modal (Target Pseudo-selector) */
.modal-fallback {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity var(--animation-duration-base) ease;
}

.modal-fallback:target {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.modal-fallback-content {
    background: var(--color-background);
    padding: var(--spacing-6);
    border-radius: var(--radius-lg);
    max-width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.95);
    transition: transform var(--animation-duration-base) ease;
}

.modal-fallback:target .modal-fallback-content {
    transform: scale(1);
}

.modal-close-fallback {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    line-height: 1;
}

/* CSS-Only Mobile Menu (Target Pseudo-selector) */
#mobile-menu-fallback {
    display: none;
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%;
    max-width: 300px;
    height: 100%;
    background: var(--color-background);
    box-shadow: var(--shadow-xl);
    transition: left var(--animation-duration-base) ease;
    z-index: 9998;
}

#mobile-menu-fallback:target {
    display: block;
    left: 0;
}

.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9997;
}

#mobile-menu-fallback:target ~ .mobile-menu-overlay {
    display: block;
}

/* CSS-Only Accordion */
.accordion-fallback {
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--color-neutral-200);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-checkbox {
    display: none;
}

.accordion-label {
    display: block;
    padding: var(--spacing-4);
    cursor: pointer;
    background: var(--color-neutral-50);
    transition: background var(--animation-duration-base) ease;
}

.accordion-label:hover {
    background: var(--color-neutral-100);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--animation-duration-base) ease;
    background: var(--color-background);
}

.accordion-checkbox:checked ~ .accordion-content {
    max-height: 500px;
    padding: var(--spacing-4);
}

/* CSS-Only Tabs */
.tabs-fallback {
    display: flex;
    flex-direction: column;
}

.tab-radio {
    display: none;
}

.tab-labels {
    display: flex;
    border-bottom: 2px solid var(--color-neutral-200);
}

.tab-label {
    padding: var(--spacing-3) var(--spacing-4);
    cursor: pointer;
    background: transparent;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--animation-duration-base) ease;
}

.tab-label:hover {
    background: var(--color-neutral-50);
}

.tab-radio:checked + .tab-label {
    border-bottom-color: var(--color-primary-500);
    color: var(--color-primary-600);
}

.tab-content {
    display: none;
    padding: var(--spacing-4);
}

.tab-radio:checked ~ .tab-content {
    display: block;
}

/* CSS-Only Form Validation */
.no-js input:required:valid {
    border-color: var(--color-success-500);
}

.no-js input:required:invalid:not(:placeholder-shown) {
    border-color: var(--color-danger-500);
}

.no-js input:required:valid ~ .validation-success {
    display: block;
}

.no-js input:required:invalid:not(:placeholder-shown) ~ .validation-error {
    display: block;
}

/* CSS-Only Loading States */
.loading-fallback {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.loading-fallback::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--color-primary-500);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* CSS-Only Progress Bar */
.progress-fallback {
    width: 100%;
    height: 4px;
    background: var(--color-neutral-200);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fallback-bar {
    height: 100%;
    background: var(--color-primary-500);
    animation: progress-animation 2s ease-in-out infinite;
}

@keyframes progress-animation {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

/* CSS-Only Tooltips */
.tooltip-fallback {
    position: relative !important;
    display: inline-block;
}

.tooltip-fallback::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 6px 6px 0 6px;
    border-color: var(--color-neutral-900) transparent transparent transparent;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--animation-duration-base) ease;
    margin-bottom: -6px;
    z-index: 10001;
}

.tooltip-fallback::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 0.75rem;
    background: var(--color-neutral-900);
    color: var(--color-neutral-100);
    border-radius: 4px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--animation-duration-base) ease;
    z-index: 10000;
    line-height: 1.2;
    font-weight: normal;
}

.tooltip-fallback:hover::before,
.tooltip-fallback:hover::after,
.tooltip-fallback:focus::before,
.tooltip-fallback:focus::after {
    opacity: 1;
}

/* Ensure tooltips work on buttons */
button.tooltip-fallback,
.btn.tooltip-fallback {
    overflow: visible !important;
}

/* CSS-Only Image Gallery */
.gallery-fallback {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-4);
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: pointer;
}

.gallery-item img {
    width: 100%;
    height: auto;
    transition: transform var(--animation-duration-base) ease;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

/* CSS-Only Notification Banner */
.notification-fallback {
    padding: var(--spacing-4);
    background: var(--color-info-50);
    border: 1px solid var(--color-info-200);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-4);
}

.notification-fallback.success {
    background: var(--color-success-50);
    border-color: var(--color-success-200);
    color: var(--color-success-700);
}

.notification-fallback.error {
    background: var(--color-danger-50);
    border-color: var(--color-danger-200);
    color: var(--color-danger-700);
}

.notification-fallback.warning {
    background: var(--color-warning-50);
    border-color: var(--color-warning-200);
    color: var(--color-warning-700);
}

/* Progressive Enhancement Classes */
.progressive-enhanced {
    /* Applied when JavaScript enhancement is complete */
}

.js-enabled .no-js-fallback {
    display: none !important;
}

.no-js .js-enhanced {
    display: none !important;
}

/* Performance Mode (for slow connections) */
.pe-connection-slow-2g *,
.pe-connection-2g * {
    animation-duration: 0s !important;
    transition-duration: 0s !important;
}

.pe-connection-slow-2g img,
.pe-connection-2g img {
    filter: blur(5px);
    transition: filter 0.3s;
}

.pe-connection-slow-2g img[src],
.pe-connection-2g img[src] {
    filter: none;
}

/* Reduced Data Mode */
[data-save-data="true"] img {
    opacity: 0.8;
}

[data-save-data="true"] video,
[data-save-data="true"] iframe {
    display: none;
}

/* Print Styles */
@media print {
    .no-print {
        display: none !important;
    }
    
    .print-only {
        display: block !important;
    }
    
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    a, a:visited {
        text-decoration: underline;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
    
    pre, blockquote {
        border: 1px solid #999;
        page-break-inside: avoid;
    }
    
    img {
        page-break-inside: avoid;
    }
    
    h2, h3 {
        page-break-after: avoid;
    }
}