/* Complete English Grammar Tenses Website - Professional CSS */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Main Colors */
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --success-color: #059669;
    --warning-color: #d97706;
    --danger-color: #dc2626;
    --info-color: #0891b2;

    /* Text Colors */
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-light: #6b7280;
    --text-white: #ffffff;

    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-accent: #f1f5f9;
    --bg-dark: #1f2937;
    --bg-gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));

    /* Border Colors */
    --border-light: #e5e7eb;
    --border-medium: #d1d5db;
    --border-accent: #3b82f6;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Monaco', 'Consolas', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition: all 0.3s ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-accent: #374151;
    --border-light: #374151;
    --border-medium: #4b5563;
}

/* Base Typography */
body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-secondary);
    font-size: 16px;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    transition: opacity 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.main-header {
    background: var(--bg-gradient);
    color: var(--text-white);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.nav-brand h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.nav-brand p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.nav-controls {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
}

.btn-outline {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-white);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* Search Container */
.search-container {
    background: var(--bg-primary);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-light);
    display: none;
}

.search-container.active {
    display: block;
    animation: slideDown 0.3s ease;
}

.search-form {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    gap: var(--spacing-sm);
}

.search-form input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition);
}

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

.search-form button {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.search-form button:hover {
    background: #1d4ed8;
}

/* Main Content */
.main-content {
    padding: var(--spacing-2xl) 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat .number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat .label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Table of Contents */
.toc-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
}

.toc-section h2 {
    text-align: center;
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: var(--spacing-xl);
    font-weight: 600;
}

.toc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.toc-category h3 {
    color: var(--secondary-color);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toc-category ul {
    list-style: none;
}

.toc-category li {
    margin-bottom: var(--spacing-sm);
}

.toc-category a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-weight: 500;
    border-left: 3px solid transparent;
}

.toc-category a:hover {
    background: var(--bg-accent);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    transform: translateX(5px);
}

/* Progress Section */
.progress-section {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-accent);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.progress-section h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--border-light);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--bg-gradient);
    width: 0%;
    border-radius: var(--radius-md);
    transition: width 0.5s ease;
}

/* Category Titles */
.category-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin: var(--spacing-2xl) 0;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.category-title::before,
.category-title::after {
    content: '';
    flex: 1;
    height: 3px;
    background: var(--bg-gradient);
    border-radius: var(--radius-sm);
}

/* Tense Cards */
.tense-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: var(--transition);
}

.tense-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.tense-header {
    background: var(--bg-gradient);
    color: var(--text-white);
    padding: var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.tense-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.tense-number {
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
}

.tense-badges {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge.beginner { background: var(--success-color); color: white; }
.badge.intermediate { background: var(--warning-color); color: white; }
.badge.advanced { background: var(--danger-color); color: white; }
.badge.frequent, .badge.common, .badge.important { background: rgba(255, 255, 255, 0.2); color: white; }

/* Tense Content */
.tense-content {
    padding: var(--spacing-xl);
}

.tense-content .section {
    margin-bottom: var(--spacing-xl);
}

.tense-content h4 {
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-bottom: 2px solid var(--border-light);
    padding-bottom: var(--spacing-sm);
}

.key-point {
    background: #fef3c7;
    border: 1px solid #fbbf24;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    color: #92400e;
    font-weight: 500;
}

/* Structure Items */
.structures-section .structure-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.structure-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.structure-item h5 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.formula {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
}

.examples {
    margin-top: var(--spacing-md);
}

.examples h6 {
    color: var(--success-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.examples ul {
    list-style: none;
}

.examples li {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    border-left: 3px solid var(--success-color);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Usage Grid */
.usage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.usage-item {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--info-color);
    transition: var(--transition);
}

.usage-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.usage-item h5 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
}

.usage-item p {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.9rem;
}

/* Time Words */
.time-words {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.time-word {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 500;
    transition: var(--transition);
}

.time-word:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
}

/* Error Examples */
.error-examples {
    margin-top: var(--spacing-md);
}

.error-item {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.incorrect {
    color: var(--danger-color);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.correct {
    color: var(--success-color);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.explanation {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
    background: var(--bg-accent);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-sm);
}

.state-verbs-note, .irregular-verbs, .grammar-note {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
    color: #991b1b;
    font-size: 0.9rem;
}

/* Practice Exercises */
.practice-section .exercise {
    background: var(--bg-accent);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.exercise h5 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.exercise ol {
    padding-left: var(--spacing-xl);
    line-height: 2;
}

.exercise li {
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.answers {
    margin-top: var(--spacing-lg);
    background: var(--bg-primary);
    border: 2px solid var(--success-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.answers summary {
    background: var(--success-color);
    color: white;
    padding: var(--spacing-md);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.answers summary:hover {
    background: #047857;
}

.answer-list {
    padding: var(--spacing-md);
}

.answer-list p {
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
    font-weight: 500;
}

/* Revision Section */
.revision-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    margin: var(--spacing-2xl) 0;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
}

.section-title {
    text-align: center;
    color: var(--primary-color);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.revision-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--border-medium);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.filter-btn:hover, .filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.revision-table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.revision-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    font-size: 0.9rem;
}

.revision-table th {
    background: var(--bg-gradient);
    color: white;
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.revision-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    vertical-align: top;
    line-height: 1.4;
}

.revision-table tbody tr {
    transition: var(--transition);
}

.revision-table tbody tr:hover {
    background: var(--bg-accent);
    transform: scale(1.01);
}

.revision-table td:first-child {
    font-weight: 600;
    color: var(--primary-color);
    background: var(--bg-secondary);
}

/* Final Practice */
.final-exercise {
    background: var(--bg-accent);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
}

.final-exercise h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.exercise-questions ol {
    padding-left: var(--spacing-xl);
    line-height: 2.5;
}

.exercise-questions li {
    margin-bottom: var(--spacing-md);
    font-weight: 500;
    font-size: 1rem;
}

.final-answers {
    margin-top: var(--spacing-xl);
    background: var(--bg-primary);
    border: 2px solid var(--info-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.final-answers summary {
    background: var(--info-color);
    color: white;
    padding: var(--spacing-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
}

.answer-explanations {
    padding: var(--spacing-lg);
}

.answer-explanations ol {
    padding-left: var(--spacing-xl);
    line-height: 2;
}

.answer-explanations li {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--success-color);
}

/* Footer */
.main-footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: #fbbf24;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    padding: var(--spacing-xs) 0;
    color: #d1d5db;
    font-size: 0.9rem;
}

.footer-section li::before {
    content: '✓';
    color: var(--success-color);
    font-weight: bold;
    margin-right: var(--spacing-sm);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #1d4ed8;
    transform: translateY(-5px) scale(1.1);
}

/* Highlighted Text */
mark {
    background: linear-gradient(120deg, #fbbf24 0%, #fbbf24 100%);
    background-repeat: no-repeat;
    background-size: 100% 0.3em;
    background-position: 0 85%;
    padding: 0 2px;
    color: inherit;
    font-weight: 600;
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .category-title {
        font-size: 2rem;
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .category-title::before,
    .category-title::after {
        display: none;
    }

    .toc-grid {
        grid-template-columns: 1fr;
    }

    .usage-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .nav-controls {
        width: 100%;
        justify-content: center;
    }

    .tense-header {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.75rem;
    }

    .section-title {
        font-size: 1.5rem;
        flex-direction: column;
    }

    .tense-content {
        padding: var(--spacing-md);
    }

    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 40px;
        height: 40px;
    }

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

/* Print Styles */
@media print {
    .main-header, .search-container, .back-to-top, .nav-controls {
        display: none;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    .tense-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
        margin-bottom: 2rem;
    }

    .tense-header {
        background: #f0f0f0 !important;
        color: #000 !important;
    }

    body {
        background: white;
        color: black;
        font-size: 12pt;
        line-height: 1.4;
    }
}

/* Focus and Accessibility */
button:focus, a:focus, input:focus, summary:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.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;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000080;
        --secondary-color: #800080;
        --text-primary: #000000;
        --bg-primary: #ffffff;
        --border-light: #666666;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}