/* Responsive Design */

/* Large screens (1200px and up) */
@media (min-width: 1200px) {
    .container {
        max-width: 1200px;
    }
    
    .hero-title {
        font-size: 4rem;
    }
    
    .section-title {
        font-size: 3rem;
    }
}

/* Medium screens (992px to 1199px) */
@media (max-width: 1199px) {
    .hero-container {
        gap: var(--spacing-12);
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-4);
    }
    
    .performance-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .methods-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .calculator-grid {
        gap: var(--spacing-6);
    }
}

/* Small screens (768px to 991px) */
@media (max-width: 991px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-6) 0;
        gap: var(--spacing-4);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-10);
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .method-cards-preview {
        transform: none;
        margin-top: var(--spacing-8);
    }
    
    .performance-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-controls {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .methods-grid {
        grid-template-columns: 1fr;
    }
    
    .implementation-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }
    
    .benchmark-charts {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Table responsiveness */
    .matrix-container {
        overflow-x: auto;
    }
    
    .performance-table {
        min-width: 800px;
    }
    
    .performance-table th,
    .performance-table td {
        padding: var(--spacing-2);
        font-size: var(--font-size-sm);
    }
    
    .method-badge {
        flex-direction: column;
        gap: var(--spacing-1);
        text-align: center;
    }
    
    .method-badge span {
        font-size: var(--font-size-xs);
    }
}

/* Extra small screens (576px to 767px) */
@media (max-width: 767px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .nav-container {
        padding: 0 var(--spacing-4);
    }
    
    .hero {
        padding: var(--spacing-16) 0;
        min-height: auto;
    }
    
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-3);
    }
    
    .stat-number {
        font-size: var(--font-size-2xl);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        padding: var(--spacing-4) var(--spacing-8);
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    section {
        padding: var(--spacing-12) 0;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-10);
    }
    
    .performance-card {
        padding: var(--spacing-6);
    }
    
    .card-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-2);
    }
    
    .card-header h3 {
        font-size: var(--font-size-lg);
    }
    
    .metric-value {
        font-size: var(--font-size-2xl);
    }
    
    .performance-highlights {
        grid-template-columns: 1fr;
    }
    
    .comparison-controls {
        grid-template-columns: 1fr;
        gap: var(--spacing-3);
    }
    
    .method-card {
        margin-bottom: var(--spacing-6);
    }
    
    .method-header {
        padding: var(--spacing-6);
    }
    
    .method-icon-large {
        font-size: 3rem;
    }
    
    .method-header h3 {
        font-size: var(--font-size-xl);
    }
    
    .method-content {
        padding: var(--spacing-6);
    }
    
    .method-actions {
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .implementation-grid {
        grid-template-columns: 1fr;
    }
    
    .implementation-card {
        padding: var(--spacing-6);
    }
    
    .code-snippet {
        font-size: var(--font-size-xs);
        padding: var(--spacing-3);
    }
    
    .benchmark-calculator {
        padding: var(--spacing-6);
    }
    
    .calculator-inputs {
        gap: var(--spacing-4);
    }
    
    .calculator-results {
        gap: var(--spacing-3);
    }
    
    .result-card {
        padding: var(--spacing-4);
    }
    
    .live-benchmarks {
        padding: var(--spacing-6);
    }
    
    .benchmark-chart {
        padding: var(--spacing-4);
    }
    
    .footer {
        padding: var(--spacing-12) 0 var(--spacing-6);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
    
    .footer-section {
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    /* Chart container adjustments */
    .chart-container {
        padding: var(--spacing-4);
        min-height: 300px;
    }
    
    /* Performance table mobile optimization */
    .performance-table {
        font-size: var(--font-size-xs);
    }
    
    .performance-table th,
    .performance-table td {
        padding: var(--spacing-1);
    }
    
    .method-badge {
        font-size: var(--font-size-xs);
    }
    
    .method-icon {
        font-size: var(--font-size-base);
    }
}

/* Extra extra small screens (up to 575px) */
@media (max-width: 575px) {
    .nav-logo {
        font-size: var(--font-size-lg);
    }
    
    .nav-logo i {
        font-size: var(--font-size-xl);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-2);
    }
    
    .stat {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: var(--spacing-2);
        background: var(--gray-50);
        border-radius: var(--radius-md);
    }
    
    .stat-number {
        font-size: var(--font-size-xl);
    }
    
    .method-cards-preview {
        grid-template-columns: 1fr;
        gap: var(--spacing-3);
    }
    
    .method-card-mini {
        padding: var(--spacing-4);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .performance-card {
        padding: var(--spacing-4);
    }
    
    .metric-value {
        font-size: var(--font-size-xl);
    }
    
    .fairness-score,
    .improvement,
    .domain-improvement,
    .generation-quality {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-1);
    }
    
    .method-header h3 {
        font-size: var(--font-size-lg);
    }
    
    .method-icon-large {
        font-size: 2.5rem;
    }
    
    /* Hide complex table on very small screens and show simplified cards */
    .performance-table-mobile {
        display: none;
    }
    
    @media (max-width: 575px) {
        .matrix-container {
            display: none;
        }
        
        .performance-table-mobile {
            display: block;
        }
    }
}

/* Performance table mobile cards */
.performance-table-mobile {
    display: none;
}

.performance-card-mobile {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-4);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-color);
}

.performance-card-mobile.physflow {
    border-left-color: var(--physflow-color);
}

.performance-card-mobile.motion {
    border-left-color: var(--motion-color);
}

.performance-card-mobile.dg-rppg {
    border-left-color: var(--dg-rppg-color);
}

.performance-card-mobile.infogan {
    border-left-color: var(--infogan-color);
}

.performance-card-mobile h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.performance-metrics-mobile {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2);
}

.metric-mobile {
    text-align: center;
    padding: var(--spacing-2);
    background: var(--gray-50);
    border-radius: var(--radius);
}

.metric-mobile .label {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    display: block;
    margin-bottom: var(--spacing-1);
}

.metric-mobile .value {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--gray-900);
}

.metric-mobile.best .value {
    color: var(--secondary-color);
}

/* Touch-friendly interactions */
@media (hover: none) and (pointer: coarse) {
    .btn {
        padding: var(--spacing-4) var(--spacing-6);
        min-height: 48px;
    }
    
    .nav-link {
        padding: var(--spacing-3) 0;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .form-select {
        padding: var(--spacing-4);
        min-height: 48px;
    }
    
    .range-input {
        height: 8px;
    }
    
    .range-input::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }
    
    .range-input::-moz-range-thumb {
        width: 24px;
        height: 24px;
    }
    
    .social-link {
        width: 48px;
        height: 48px;
    }
}

/* Print styles */
@media print {
    .navbar,
    .nav-toggle,
    .hero-actions,
    .method-actions,
    .footer {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-8) 0;
    }
    
    section {
        padding: var(--spacing-8) 0;
        break-inside: avoid;
    }
    
    .performance-card,
    .method-card,
    .implementation-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
    
    .chart-container {
        break-inside: avoid;
    }
    
    .performance-table {
        font-size: var(--font-size-sm);
    }
    
    .performance-table th,
    .performance-table td {
        padding: var(--spacing-2);
    }
}

/* Reduced motion preferences */
@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;
    }
    
    .method-card:hover,
    .performance-card:hover,
    .implementation-card:hover {
        transform: none;
    }
    
    .btn:hover {
        transform: none;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --secondary-color: #008000;
        --danger-color: #ff0000;
        --gray-600: #000000;
        --gray-700: #000000;
        --gray-800: #000000;
        --gray-900: #000000;
    }
    
    .btn-outline {
        border-width: 3px;
    }
    
    .performance-card,
    .method-card,
    .implementation-card {
        border: 2px solid var(--gray-900);
    }
    
    .form-select,
    .range-input {
        border: 2px solid var(--gray-900);
    }
}

/* Focus indicators for keyboard navigation */
.btn:focus,
.nav-link:focus,
.form-select:focus,
.range-input:focus,
.social-link:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

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

.skip-link:focus {
    top: 6px;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Error states */
.error {
    color: var(--danger-color);
    border-color: var(--danger-color);
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    padding: var(--spacing-3);
    border-radius: var(--radius);
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
}

/* Success states */
.success {
    color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.success-message {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
    padding: var(--spacing-3);
    border-radius: var(--radius);
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
}