/* DDRKAM Website Stylesheet - Complete Implementation
 * Copyright (C) 2025, Shyamal Suhana Chandra
 *
 * Design Elements:
 * - Glassmorphism: Inspired by Apple Human Interface Guidelines [7]
 * - Material Design Ripple: Based on Google Material Design [8]
 * - CSS backdrop-filter: W3C Standard [10]
 * - Modern Animations: Intersection Observer API [9]
 */

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --bg-dark: #0f172a;
    --bg-darker: #020617;
    --bg-light: #1e293b;
    --bg-glass: rgba(15, 23, 42, 0.7);
    --bg-glass-light: rgba(30, 41, 59, 0.6);
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-2: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 100%);
    --gradient-3: linear-gradient(135deg, #f59e0b 0%, #ef4444 50%, #ec4899 100%);
    --gradient-4: linear-gradient(135deg, #10b981 0%, #06b6d4 50%, #6366f1 100%);
    --gradient-radial: radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
                        radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.3) 0%, transparent 50%),
                        radial-gradient(circle at 40% 40%, rgba(139, 92, 246, 0.2) 0%, transparent 50%);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    --shadow-glow-pink: 0 0 20px rgba(236, 72, 153, 0.3);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--bg-darker);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-align: center;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
}

/* Center-align all text elements */
p, h1, h2, h3, h4, h5, h6, li, ul, ol, span, div {
    text-align: center;
}

/* Exceptions for specific elements that need left alignment */
.nav-menu,
.nav-logo {
    text-align: left;
}

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

.method-formula code {
    display: block;
    text-align: center;
}

/* ============================================================================
   Navigation
   ============================================================================ */

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    z-index: 1000;
    padding: 1rem 0;
    transition: var(--transition);
    animation: slideDown 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 2rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.logo-text {
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.1em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8rem 2rem 4rem;
    gap: 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-radial);
    pointer-events: none;
    animation: gradientShift 8s ease-in-out infinite alternate;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 25% 25%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(236, 72, 153, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    animation: particleFloat 12s ease-in-out infinite;
    pointer-events: none;
}

@keyframes gradientShift {
    0% { transform: translateX(-10px) translateY(-10px) scale(1); }
    100% { transform: translateX(10px) translateY(10px) scale(1.05); }
}

@keyframes particleFloat {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
        opacity: 0.8;
    }
    25% {
        transform: translateY(-20px) rotate(90deg);
        opacity: 0.6;
    }
    50% {
        transform: translateY(0px) rotate(180deg);
        opacity: 1;
    }
    75% {
        transform: translateY(20px) rotate(270deg);
        opacity: 0.7;
    }
}

.hero-content {
    flex: 1;
    max-width: 600px;
    z-index: 1;
    text-align: center;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-inventor {
    text-align: center;
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.hero-research-highlight {
    background: var(--bg-glass-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-research-highlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.05), transparent);
    transition: left 0.8s ease;
}

.hero-research-highlight:hover::before {
    left: 100%;
}

.research-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gradient-1);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.research-summary {
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    font-weight: 500;
}

.research-summary strong {
    color: var(--primary-color);
}

.research-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.research-link:hover {
    gap: 0.75rem;
    color: var(--secondary-color);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
    animation: pulse 2s infinite;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 35px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: var(--bg-glass-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-primary);
    border: 1px solid rgba(148, 163, 184, 0.3);
}

.btn-secondary:hover {
    background: var(--bg-glass);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.2);
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3); }
    50% { box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5); }
}

.hero-quick-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
    justify-content: center;
}

.quick-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 0.5rem;
    transition: var(--transition);
}

.quick-link:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.hero-visualization {
    flex: 1;
    max-width: 500px;
    height: 400px;
    position: relative;
}

#ode-canvas {
    width: 100%;
    height: 100%;
    border-radius: 1rem;
    background: var(--bg-light);
}

/* ============================================================================
   Sections
   ============================================================================ */

section {
    padding: 5rem 0;
    position: relative;
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.subsection-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
}

/* ============================================================================
   Features Grid
   ============================================================================ */

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--bg-glass-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 1.5rem;
    border: 1px solid rgba(148, 163, 184, 0.15);
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.5s ease;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary-color);
    box-shadow: 0 20px 40px -10px rgba(99, 102, 241, 0.4), var(--shadow-glow);
    background: var(--bg-glass);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ============================================================================
   Methods Section
   ============================================================================ */

.methods-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.method-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid rgba(148, 163, 184, 0.1);
    transition: var(--transition);
}

.method-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.3);
}

.method-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.method-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.method-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.method-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.method-formula {
    background: var(--bg-darker);
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
    border-left: 3px solid var(--primary-color);
}

.method-formula code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-all;
}

.method-features {
    list-style: none;
    margin-top: 1rem;
}

.method-features li {
    color: var(--text-secondary);
    padding: 0.5rem 0;
    font-size: 0.9rem;
}

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

.comparison-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.comparison-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid rgba(148, 163, 184, 0.1);
    text-align: center;
    transition: var(--transition);
}

.comparison-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.comparison-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.comparison-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.comparison-charts-section {
    margin-top: 4rem;
}

.comparison-chart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.chart-wrapper {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid rgba(148, 163, 184, 0.1);
    text-align: center;
}

.chart-wrapper img {
    width: 100%;
    height: auto;
    border-radius: 0.5rem;
}

.chart-wrapper h5 {
    color: var(--text-primary);
    margin-top: 1rem;
    font-size: 1.1rem;
}

/* ============================================================================
   Benchmarks Section
   ============================================================================ */

.validation-badge {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

.benchmark-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.benchmark-btn {
    padding: 0.75rem 1.5rem;
    background: var(--bg-light);
    border: 2px solid rgba(148, 163, 184, 0.2);
    border-radius: 0.5rem;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.benchmark-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.benchmark-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.benchmark-charts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.bar-charts-section {
    margin-top: 3rem;
}

.bar-charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.chart-container {
    background: var(--bg-glass-light);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 2rem;
    border-radius: 1.5rem;
    border: 1px solid rgba(148, 163, 184, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.chart-container:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15), var(--shadow-glow);
}

.chart-container[style*="grid-column"] {
    grid-column: 1 / -1;
}

.chart-container canvas {
    width: 100%;
    height: 250px;
    background: transparent;
}

.chart-container[style*="grid-column"] canvas {
    height: 400px;
}

.chart-container h4 {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
}

.chart-description {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    text-align: center;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.stat-card {
    background: var(--bg-glass-light);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 2rem;
    border-radius: 1.5rem;
    border: 1px solid rgba(148, 163, 184, 0.15);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1), var(--shadow-glow);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.stat-note {
    font-size: 0.75rem;
    opacity: 0.8;
    color: var(--text-muted);
}

.benchmark-citation {
    background: var(--bg-glass-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-top: 2rem;
    text-align: center;
}

.citation-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.citation-text strong {
    color: var(--primary-color);
}

.citation-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.citation-link:hover {
    gap: 0.75rem;
    color: var(--secondary-color);
}

.validation-notice {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 1rem;
    margin-top: 2rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
    text-align: center;
}

.validation-title {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 600;
    font-size: 1.1rem;
}

.validation-description {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================================================
   Test Visualizations Section
   ============================================================================ */

.test-visualizations {
    padding: 6rem 0;
    background: var(--bg-dark);
}

.test-section {
    margin-bottom: 4rem;
}

.test-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-align: center;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.test-description {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.test-charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .test-charts-grid {
        grid-template-columns: 1fr;
    }
}

.test-chart-container {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid rgba(148, 163, 184, 0.1);
    transition: var(--transition);
}

.test-chart-container:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.test-chart-container canvas {
    width: 100%;
    height: 400px;
    background: transparent;
    display: block;
}

.test-chart-container h4 {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
}

.test-chart-container .chart-description {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    text-align: center;
}

/* ============================================================================
   Documentation Section
   ============================================================================ */

.publications-section {
    margin-bottom: 4rem;
}

.publications-intro {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-size: 1.1rem;
    line-height: 1.8;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.doc-card {
    background: var(--bg-glass-light);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 2rem;
    border-radius: 1.5rem;
    border: 1px solid rgba(148, 163, 184, 0.2);
    text-decoration: none;
    color: inherit;
    display: block;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.doc-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.doc-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.05), transparent);
    transition: left 0.6s ease;
}

.doc-card:hover {
    transform: translateY(-10px) scale(1.03);
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15), var(--shadow-glow);
}

.doc-card:hover::before {
    transform: scaleX(1);
}

.doc-card:hover::after {
    left: 100%;
}

.doc-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.doc-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.doc-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 1rem;
    font-family: 'JetBrains Mono', monospace;
}

.doc-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.pdf-badge {
    display: inline-block;
    background: var(--success-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.doc-link {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.doc-card:hover .doc-link {
    gap: 0.75rem;
}

.pdf-download-all {
    text-align: center;
    margin-top: 3rem;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 1rem;
    border: 1px solid rgba(148, 163, 184, 0.1);
}

.pdf-download-all h4 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.pdf-download-all p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.copyright-notice {
    color: var(--text-muted);
    margin-top: 1.5rem;
    font-size: 0.85rem;
    font-style: italic;
    line-height: 1.8;
}

.copyright-notice a {
    color: var(--primary-color);
    text-decoration: none;
}

.copyright-notice a:hover {
    text-decoration: underline;
}

.code-section {
    margin-top: 3rem;
}

/* ============================================================================
   References Section
   ============================================================================ */

.references-list {
    max-width: 900px;
    margin: 0 auto;
}

.reference-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    justify-content: center;
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

.ref-number {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.1rem;
    min-width: 2rem;
}

.ref-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

.ref-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.ref-content em {
    color: var(--text-secondary);
    font-style: italic;
}

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

.footer {
    background: var(--bg-darker);
    border-top: 1px solid rgba(148, 163, 184, 0.1);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    color: var(--text-primary);
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

.footer-inventor {
    color: var(--primary-color);
    font-weight: 600;
    margin-top: 0.5rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-top: 1rem;
}

.footer-dedication {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(148, 163, 184, 0.1);
    color: var(--text-secondary);
    font-style: italic;
}

.footer-dedication strong {
    color: var(--primary-color);
}

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-glass);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 2px 0 20px rgba(0, 0, 0, 0.3);
        border-top: 1px solid rgba(148, 163, 184, 0.2);
    }

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

    .nav-menu a {
        padding: 1rem;
        margin: 0.5rem 0;
        border-radius: 1rem;
        transition: var(--transition);
        background: var(--bg-glass-light);
        backdrop-filter: blur(10px);
    }

    .nav-menu a:hover {
        background: var(--bg-light);
        transform: translateX(10px);
    }

    .mobile-menu-toggle {
        display: flex;
        cursor: pointer;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero {
        flex-direction: column;
        padding: 6rem 1rem 2rem;
        text-align: center;
        gap: 3rem;
    }

    .hero-content {
        margin: 0;
    }

    .hero-visualization {
        max-width: 100%;
        height: 250px;
        order: -1; /* Show canvas first on mobile */
    }

    .hero-title {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        padding: 1rem 2rem;
        font-size: 1rem;
    }

    .features-grid,
    .methods-grid,
    .docs-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .feature-card,
    .method-card,
    .doc-card {
        padding: 1.5rem;
    }

    .comparison-chart-grid,
    .bar-charts-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .benchmark-charts {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .chart-container {
        padding: 1.5rem;
    }

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

    .container {
        padding: 0 1rem;
    }

    section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 2rem;
    }

    /* Enhanced touch interactions */
    .btn, .feature-card, .doc-card, .stat-card, .chart-container {
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }

    /* Better mobile scrolling */
    html {
        scroll-behavior: smooth;
        -webkit-overflow-scrolling: touch;
    }

    /* Mobile footer improvements */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }
    
    .download-buttons {
        flex-direction: column;
    }
    
    .download-buttons .btn {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================================================
   Print Styles
   ============================================================================ */

@media print {
    .navbar,
    .hero-visualization,
    .benchmark-controls,
    .btn,
    .footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .section-title {
        color: black;
    }
}

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

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

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(99, 102, 241, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: rotate 1s ease-in-out infinite;
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out forwards;
}

/* Loading states */
.chart-container.loading {
    position: relative;
    overflow: hidden;
}

.chart-container.loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid rgba(99, 102, 241, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: rotate 1s ease-in-out infinite;
    z-index: 10;
}

.chart-container.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-glass-light);
    backdrop-filter: blur(2px);
    z-index: 5;
}

.chart-container.loaded {
    animation: fadeInUp 0.5s ease-out;
}

/* ============================================================================
   Theme Toggle
   ============================================================================ */

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.theme-toggle-icon {
    width: 24px;
    height: 24px;
    transition: var(--transition);
    fill: var(--text-primary);
}

/* Light mode variables */
body.light-mode {
    --bg-dark: #ffffff;
    --bg-darker: #f8fafc;
    --bg-light: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.8);
    --bg-glass-light: rgba(241, 245, 249, 0.6);
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.2);
    --shadow-glow-pink: 0 0 20px rgba(236, 72, 153, 0.2);
}

body.light-mode .navbar {
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid rgba(148, 163, 184, 0.3);
}

body.light-mode .feature-card,
body.light-mode .doc-card,
body.light-mode .stat-card,
body.light-mode .chart-container {
    background: rgba(241, 245, 249, 0.6);
    border-color: rgba(148, 163, 184, 0.3);
}

body.light-mode .btn-secondary {
    background: rgba(241, 245, 249, 0.8);
    border-color: rgba(148, 163, 184, 0.4);
}

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

.footer {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-1);
}

/* ============================================================================
   Performance Optimizations
   ============================================================================ */

/* GPU acceleration for animations */
.feature-card,
.doc-card,
.stat-card,
.chart-container,
.btn,
.nav-menu a {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Optimize scrolling */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================================================
   Accessibility
   ============================================================================ */

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

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ============================================================================
   Complexity Proofs Accordion Styles
   ============================================================================ */

.complexity-proofs {
    padding: 80px 0;
}

.proofs-accordion {
    max-width: 1200px;
    margin: 0 auto;
}

.proof-category {
    margin-bottom: 3rem;
}

.proof-category:last-child {
    margin-bottom: 0;
}

.category-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--primary-color);
}

.accordion-item {
    background: var(--bg-glass);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: var(--transition);
}

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

.accordion-header {
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: transparent;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

.accordion-header:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.accordion-header[aria-expanded="true"] {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-color);
}

.accordion-title {
    flex: 1;
    margin-right: 1rem;
}

.accordion-icon {
    font-size: 0.875rem;
    transition: transform 0.3s ease;
    color: var(--primary-color);
}

.accordion-header[aria-expanded="true"] .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.4s ease-out;
    padding: 0 1.5rem;
}

.accordion-header[aria-expanded="true"] + .accordion-content {
    max-height: 5000px;
    padding: 1.5rem;
    border-top: 1px solid rgba(99, 102, 241, 0.2);
}

.theorem-statement {
    background: rgba(99, 102, 241, 0.1);
    border-left: 4px solid var(--primary-color);
    padding: 1rem 1.25rem;
    margin-bottom: 1.25rem;
    border-radius: 4px;
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.theorem-statement strong {
    color: var(--primary-color);
    font-weight: 700;
}

.proof-content {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

.proof-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.proof-content ul {
    margin: 1rem 0;
    padding-left: 2rem;
    list-style-type: disc;
}

.proof-content li {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

.math-formula {
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--bg-darker);
    border-radius: 8px;
    overflow-x: auto;
    text-align: center;
}

.math-formula code,
.math-formula pre {
    background: transparent;
    border: none;
    padding: 0;
    font-family: 'JetBrains Mono', monospace;
}

/* MathJax styling */
.MathJax {
    color: var(--text-primary) !important;
}

.MathJax_Display {
    margin: 1.5rem 0 !important;
}

@media (max-width: 768px) {
    .accordion-header {
        padding: 1rem;
        font-size: 1rem;
    }
    
    .accordion-content {
        padding: 0 1rem;
    }
    
    .accordion-header[aria-expanded="true"] + .accordion-content {
        padding: 1rem;
    }
    
    .category-title {
        font-size: 1.5rem;
    }
    
    .theorem-statement {
        padding: 0.875rem 1rem;
        font-size: 1rem;
    }
}