/* ==========================================================================
   CSS Reset & Base Styles
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Color System - Terminal Glow */
    --color-primary-500: #00FFFF;
    --color-primary-700: #00AABF;
    --color-primary-900: #006B73;
    
    --color-bg-page: #000000;
    --color-bg-surface-1: #0A0A0A;
    --color-bg-surface-2: #141414;
    --color-bg-surface-3: #1E1E1E;
    
    --color-text-primary: #E4E4E7;
    --color-text-secondary: #A0A0A9;
    --color-text-tertiary: #707079;
    
    --color-border-default: #27272A;
    --color-border-active: #00FFFF;
    
    --color-semantic-success: #22C55E;
    --color-semantic-warning: #F59E0B;
    --color-semantic-error: #EF4444;
    
    --color-tag-frontier: #EC4899;
    --color-tag-vision: #8B5CF6;
    --color-tag-thinking: #F59E0B;
    --color-tag-multimodal: #10B981;
    --color-tag-reasoning: #3B82F6;
    --color-tag-coding: #F97316;
    --color-tag-fast: #06B6D4;
    --color-tag-experimental: #8B5CF6;
    
    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Layout */
    --max-width: 1440px;
    --header-height: 80px;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows & Glows */
    --glow-sm: 0 0 8px rgba(0, 255, 255, 0.15);
    --glow-md: 0 0 16px rgba(0, 255, 255, 0.2);
    --glow-lg: 0 0 24px rgba(0, 255, 255, 0.25);
    --glow-xl: 0 0 32px rgba(0, 255, 255, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-normal: 250ms ease-out;
    --transition-slow: 400ms ease-out;
}

/* Dark Theme Specific */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg-page: #000000;
        --color-bg-surface-1: #0A0A0A;
        --color-bg-surface-2: #141414;
        --color-text-primary: #E4E4E7;
    }
}

/* Base Styles */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-page);
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(0, 255, 255, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(236, 72, 153, 0.02) 0%, transparent 50%);
    background-attachment: fixed;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-primary-500);
    text-decoration: none;
    transition: color var(--transition-normal);
}

a:hover {
    color: var(--color-primary-700);
}

/* ==========================================================================
   Loading Screen
   ========================================================================== */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-bg-page);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
    max-width: 300px;
}

.loading-logo {
    font-size: 3rem;
    color: var(--color-primary-500);
    margin-bottom: var(--space-lg);
    animation: pulse 2s ease-in-out infinite;
}

.loading-text {
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
}

.loading-progress {
    width: 100%;
    height: 4px;
    background: var(--color-bg-surface-2);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.loading-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary-500), var(--color-primary-700));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

/* ==========================================================================
   Header
   ========================================================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-default);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.logo i {
    color: var(--color-primary-500);
    font-size: 1.5rem;
}

.nav {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-primary);
    background: var(--color-bg-surface-2);
    box-shadow: var(--glow-sm);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--color-primary-500);
    border-radius: var(--radius-full);
}

.header-actions {
    display: flex;
    gap: var(--space-sm);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    min-height: 44px;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary-500);
    color: var(--color-bg-page);
    box-shadow: var(--glow-sm);
}

.btn-primary:hover {
    background: var(--color-primary-700);
    box-shadow: var(--glow-md);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-border-default);
}

.btn-outline:hover {
    background: var(--color-bg-surface-2);
    border-color: var(--color-primary-500);
    box-shadow: var(--glow-sm);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(236, 72, 153, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    animation: float 6s ease-in-out infinite;
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: var(--space-lg);
    line-height: 1.1;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-tag-frontier));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2xl);
    line-height: 1.6;
}

.highlight {
    color: var(--color-primary-500);
    font-weight: 600;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.stat-item {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-bg-surface-1);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--glow-lg);
    border-color: var(--color-primary-500);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-primary-500);
    font-family: var(--font-family-mono);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) scale(1); }
    50% { transform: translateY(-20px) scale(1.02); }
}

/* ==========================================================================
   Controls Section
   ========================================================================== */

.controls {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-surface-1);
    border-top: 1px solid var(--color-border-default);
    border-bottom: 1px solid var(--color-border-default);
}

.controls-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    height: 56px;
    padding: 0 3rem 0 var(--space-lg);
    background: var(--color-bg-surface-2);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: var(--glow-md);
}

.search-icon {
    position: absolute;
    left: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    font-size: var(--font-size-lg);
}

.search-clear {
    position: absolute;
    right: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.search-clear:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-surface-3);
}

.filters-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.filter-group label {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.filter-chip {
    padding: var(--space-xs) var(--space-sm);
    background: transparent;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.filter-chip:hover {
    border-color: var(--color-primary-500);
    color: var(--color-text-primary);
    background: rgba(0, 255, 255, 0.05);
}

.filter-chip.active {
    background: var(--color-primary-500);
    color: var(--color-bg-page);
    border-color: var(--color-primary-500);
    box-shadow: var(--glow-sm);
}

.sort-select {
    width: 200px;
    height: 44px;
    padding: 0 var(--space-sm);
    background: var(--color-bg-surface-2);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.sort-select:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: var(--glow-sm);
}

/* ==========================================================================
   Models Section
   ========================================================================== */

.models-section {
    padding: var(--space-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-lg);
}

.view-controls {
    display: flex;
    justify-content: center;
    gap: var(--space-xs);
}

.view-btn {
    width: 44px;
    height: 44px;
    background: var(--color-bg-surface-1);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.view-btn:hover {
    border-color: var(--color-primary-500);
    color: var(--color-text-primary);
    box-shadow: var(--glow-sm);
}

.view-btn.active {
    background: var(--color-primary-500);
    color: var(--color-bg-page);
    border-color: var(--color-primary-500);
    box-shadow: var(--glow-md);
}

.models-container {
    position: relative;
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

/* Model Card */
.model-card {
    background: var(--color-bg-surface-1);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.model-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary-500), var(--color-tag-frontier));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.model-card:hover {
    transform: translateY(-4px);
    background: var(--color-bg-surface-2);
    box-shadow: var(--glow-lg);
    border-color: var(--color-primary-500);
}

.model-card:hover::before {
    opacity: 1;
}

.model-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.model-logo {
    width: 40px;
    height: 40px;
    background: var(--color-bg-surface-3);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-primary-500);
}

.model-info {
    flex: 1;
}

.model-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.model-developer {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.model-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: var(--space-md);
}

.model-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.model-tag {
    padding: 0.25rem 0.5rem;
    background: var(--color-bg-surface-3);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid var(--color-border-default);
}

.model-tag.frontier {
    background: rgba(236, 72, 153, 0.15);
    color: var(--color-tag-frontier);
    border-color: var(--color-tag-frontier);
}

.model-tag.vision {
    background: rgba(139, 92, 246, 0.15);
    color: var(--color-tag-vision);
    border-color: var(--color-tag-vision);
}

.model-tag.thinking {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-tag-thinking);
    border-color: var(--color-tag-thinking);
}

.model-tag.multimodal {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-tag-multimodal);
    border-color: var(--color-tag-multimodal);
}

.model-tag.reasoning {
    background: rgba(59, 130, 246, 0.15);
    color: var(--color-tag-reasoning);
    border-color: var(--color-tag-reasoning);
}

.model-tag.coding {
    background: rgba(249, 115, 22, 0.15);
    color: var(--color-tag-coding);
    border-color: var(--color-tag-coding);
}

.model-tag.fast {
    background: rgba(6, 182, 212, 0.15);
    color: var(--color-tag-fast);
    border-color: var(--color-tag-fast);
}

.model-tag.experimental {
    background: rgba(139, 92, 246, 0.15);
    color: var(--color-tag-experimental);
    border-color: var(--color-tag-experimental);
}

.model-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
}

.model-stat {
    padding: var(--space-sm);
    background: var(--color-bg-surface-2);
    border-radius: var(--radius-md);
    text-align: center;
}

.model-stat-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.model-stat-value {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    font-weight: 600;
}

/* Timeline View */
.models-timeline {
    padding: var(--space-lg) 0;
}

.timeline-container {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline-track {
    position: relative;
    padding: var(--space-xl) 0;
}

.timeline-track::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary-500), var(--color-tag-frontier));
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-xl);
    position: relative;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-content {
    flex: 1;
    padding: var(--space-lg);
    background: var(--color-bg-surface-1);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    margin: 0 var(--space-lg);
    max-width: 45%;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 12px;
    background: var(--color-primary-500);
    border: 3px solid var(--color-bg-page);
    border-radius: 50%;
    box-shadow: var(--glow-sm);
    z-index: 10;
}

/* ==========================================================================
   Comparison Section
   ========================================================================== */

.comparison-section {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-surface-1);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.comparison-card {
    background: var(--color-bg-surface-1);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

.comparison-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-md);
    border-color: var(--color-primary-500);
}

.comparison-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-lg);
    text-align: center;
    color: var(--color-text-primary);
}

.chart-container {
    height: 300px;
    position: relative;
}

/* ==========================================================================
   Trends Section
   ========================================================================== */

.trends-section {
    padding: var(--space-3xl) 0;
}

.trends-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.trend-card {
    background: var(--color-bg-surface-1);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.trend-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary-500), var(--color-tag-frontier));
}

.trend-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--glow-lg);
    border-color: var(--color-primary-500);
}

.trend-icon {
    width: 60px;
    height: 60px;
    background: rgba(0, 255, 255, 0.1);
    border: 1px solid var(--color-primary-500);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-lg);
    font-size: 1.5rem;
    color: var(--color-primary-500);
}

.trend-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.trend-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.trend-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
}

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

.trend-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary-500);
    font-family: var(--font-family-mono);
}

.trend-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Statistics Section
   ========================================================================== */

.statistics-section {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-surface-1);
}

.statistics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.stats-card {
    background: var(--color-bg-surface-1);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: all var(--transition-normal);
}

.stats-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-md);
    border-color: var(--color-primary-500);
}

.stats-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
}

.stats-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.stat-detail {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-default);
}

.stat-detail:last-child {
    border-bottom: none;
}

.stat-detail .stat-label {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.stat-detail .stat-value {
    color: var(--color-text-primary);
    font-weight: 600;
    font-family: var(--font-family-mono);
}

/* ==========================================================================
   Modal
   ========================================================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--color-bg-surface-1);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal.show .modal-content {
    transform: scale(1);
}

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

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.modal-close {
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--color-bg-surface-2);
    color: var(--color-text-primary);
}

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

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background: var(--color-bg-surface-1);
    border-top: 1px solid var(--color-border-default);
    padding: var(--space-3xl) 0 var(--space-lg);
    margin-top: var(--space-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

.footer-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-links li {
    color: var(--color-text-secondary);
    transition: color var(--transition-normal);
}

.footer-links li:hover {
    color: var(--color-text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-default);
    color: var(--color-text-tertiary);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
    :root {
        --space-3xl: 4rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .models-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    .timeline-content {
        max-width: 80%;
    }
}

@media (max-width: 768px) {
    .header-nav {
        display: none;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .controls-content {
        gap: var(--space-md);
    }
    
    .filter-chips {
        gap: 0.25rem;
    }
    
    .filter-chip {
        font-size: var(--font-size-xs);
        padding: 0.25rem 0.5rem;
    }
    
    .models-grid {
        grid-template-columns: 1fr;
    }
    
    .model-card {
        padding: var(--space-md);
    }
    
    .comparison-grid,
    .trends-grid,
    .statistics-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-track::before {
        left: 20px;
    }
    
    .timeline-item {
        flex-direction: row !important;
        padding-left: 50px;
    }
    
    .timeline-content {
        max-width: 100%;
        margin: 0;
        margin-left: var(--space-sm);
    }
    
    .timeline-dot {
        left: 20px;
    }
    
    .chart-container {
        height: 250px;
    }
    
    .modal-content {
        width: 95%;
    }
}

@media (max-width: 480px) {
    :root {
        --space-sm: 0.75rem;
        --space-md: 1rem;
        --space-lg: 1.5rem;
        --space-xl: 2rem;
    }
    
    .container {
        padding: 0 var(--space-xs);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .model-stats {
        grid-template-columns: 1fr;
    }
    
    .trend-stats {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

/* ==========================================================================
   Animations
   ========================================================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: var(--glow-sm);
    }
    50% {
        box-shadow: var(--glow-xl);
    }
}

/* Utility Classes */
.fade-in-up { animation: fadeInUp 0.6s ease-out; }
.fade-in-down { animation: fadeInDown 0.6s ease-out; }
.slide-in-left { animation: slideInLeft 0.6s ease-out; }
.slide-in-right { animation: slideInRight 0.6s ease-out; }
.glow { animation: glow 2s ease-in-out infinite; }

/* Hide scrollbar but keep functionality */
.scrollbar-hide {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.scrollbar-hide::-webkit-scrollbar {
    display: none;
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .modal {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .model-card {
        break-inside: avoid;
        border: 1px solid #ccc !important;
    }
}