:root {
    --primary: #0969da;
    --primary-light: #218bff;
    --primary-dark: #0550ae;
    --accent-cyan: #00d4ff;
    --accent-purple: #9966cc;
    --success: #1a7f37;
    --warning: #9a6700;
    --danger: #cf222e;
    --text: #1f2328;
    --text-secondary: #656d76;
    --text-tertiary: #8b949e;
    --bg: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --border: #d0d7de;
    --shadow-sm: 0 1px 2px rgba(31, 35, 40, 0.04), 0 1px 3px rgba(31, 35, 40, 0.08);
    --shadow: 0 1px 3px rgba(31, 35, 40, 0.12);
    --shadow-lg: 0 8px 24px rgba(31, 35, 40, 0.12);
    --shadow-xl: 0 16px 48px rgba(31, 35, 40, 0.16);
    --radius: 6px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #9966cc 100%);
    --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --transition: all 0.2s ease;
    --transition-slow: all 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary: #58a6ff;
        --primary-light: #79b8ff;
        --primary-dark: #388bfd;
        --text: #e6edf3;
        --text-secondary: #8b949e;
        --text-tertiary: #6e7681;
        --bg: #0d1117;
        --bg-secondary: #161b22;
        --bg-tertiary: #21262d;
        --border: #30363d;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.2);
        --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
        --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text);
    line-height: 1.6;
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

@media (prefers-color-scheme: dark) {
    .header {
        background: rgba(13, 17, 23, 0.95);
    }
}

.header-content {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 12px 0;
    height: 60px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    opacity: 0.85;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.nav {
    display: flex;
    gap: 8px;
    margin-left: auto;
    align-items: center;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--text);
    background: var(--bg-secondary);
}

.nav-link.demo-link {
    background: var(--gradient-primary);
    color: white;
}

.nav-link.demo-link:hover {
    opacity: 0.9;
    color: white;
}

.nav-icon {
    font-size: 16px;
}

.github-icon {
    vertical-align: middle;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-box input {
    padding: 8px 12px 8px 38px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    width: 260px;
    outline: none;
    transition: var(--transition);
    background: var(--bg);
    color: var(--text);
}

.search-box input::placeholder {
    color: var(--text-tertiary);
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
    width: 300px;
}

.search-results {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    z-index: 101;
}

.search-results.hidden {
    display: none;
}

.search-result-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover {
    background: var(--bg-secondary);
}

.search-result-item h4 {
    margin: 0 0 4px;
    font-size: 14px;
    color: var(--text);
}

.search-result-item p {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
}

/* Hero */
.hero {
    position: relative;
    padding: 100px 0 80px;
    background: var(--gradient-hero);
    color: white;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 50%;
    left: var(--x);
    top: var(--y);
    opacity: 0.4;
    animation: float 6s ease-in-out infinite;
    animation-delay: calc(var(--delay) * 1s);
}

.particle:nth-child(even) {
    background: var(--accent-purple);
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.4; }
    25% { transform: translate(30px, -20px) scale(1.2); opacity: 0.6; }
    50% { transform: translate(-20px, 30px) scale(0.8); opacity: 0.3; }
    75% { transform: translate(20px, 10px) scale(1.1); opacity: 0.5; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
}

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.1;
    background: linear-gradient(135deg, #ffffff 0%, #e0e0e0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    max-width: 700px;
    margin: 0 auto 32px;
    opacity: 0.9;
    line-height: 1.7;
    color: #e0e0e0;
}

.hero-subtitle strong {
    color: white;
    font-weight: 600;
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-bottom: 40px;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 32px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    color: #8b949e;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-lg);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-slow);
    cursor: pointer;
    border: none;
}

.btn svg {
    flex-shrink: 0;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg);
    padding: 32px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    transition: var(--transition-slow);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon.gpu { background: linear-gradient(135deg, #00d4ff20 0%, #00d4ff10 100%); color: #00d4ff; }
.feature-icon.physics { background: linear-gradient(135deg, #1a7f3720 0%, #1a7f3710 100%); color: #1a7f37; }
.feature-icon.quality { background: linear-gradient(135deg, #9966cc20 0%, #9966cc10 100%); color: #9966cc; }
.feature-icon.visual { background: linear-gradient(135deg, #cf222e20 0%, #cf222e10 100%); color: #cf222e; }
.feature-icon.input { background: linear-gradient(135deg, #9a670020 0%, #9a670010 100%); color: #9a6700; }
.feature-icon.modern { background: linear-gradient(135deg, #0969da20 0%, #0969da10 100%); color: #0969da; }

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 15px;
}

/* Steps */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
    max-width: 700px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text);
}

.step-content p {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.step-note {
    font-size: 14px;
}

.step-note a {
    color: var(--primary);
}

/* Code */
pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 16px 20px;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin: 12px 0;
}

code {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text);
}

pre code {
    background: none;
    border: none;
    padding: 0;
}

.requirements {
    margin-top: 48px;
    text-align: center;
}

.requirements h4 {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.req-tags {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.req-tag {
    padding: 8px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Docs Grid */
.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.doc-card {
    background: var(--bg);
    padding: 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition-slow);
    text-decoration: none;
    display: block;
}

.doc-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
    border-color: var(--primary);
}

.doc-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.doc-icon.api { background: var(--bg-secondary); color: var(--primary); }
.doc-icon.perf { background: var(--bg-secondary); color: var(--success); }
.doc-icon.troubleshoot { background: var(--bg-secondary); color: var(--warning); }
.doc-icon.arch { background: var(--bg-secondary); color: var(--accent-purple); }
.doc-icon.setup { background: var(--bg-secondary); color: var(--accent-cyan); }
.doc-icon.tutorial { background: var(--bg-secondary); color: var(--primary); }

.doc-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text);
}

.doc-card p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 14px;
    line-height: 1.6;
}

.doc-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
}

/* Resources Grid */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.resource-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: var(--transition);
}

.resource-card:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.resource-card svg {
    color: var(--text-secondary);
    transition: var(--transition);
}

.resource-card:hover svg {
    color: var(--primary);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 48px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 48px;
    margin-bottom: 32px;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 12px;
    font-size: 14px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-section h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
}

.footer-section a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 10px;
    font-size: 14px;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 44px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 0;
    }
    
    .nav {
        order: 3;
        width: 100%;
        justify-content: center;
        padding-top: 12px;
        border-top: 1px solid var(--border);
        margin-top: 12px;
    }
    
    .search-box {
        order: 2;
    }
    
    .search-box input {
        width: 180px;
    }
    
    .search-box input:focus {
        width: 220px;
    }
    
    .hero {
        padding: 60px 0 50px;
    }
    
    .hero h1 {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        gap: 16px;
    }
    
    .stat-value {
        font-size: 24px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .features-grid,
    .docs-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* Generated documentation pages */
.doc-content {
    max-width: 960px;
    margin: 40px auto 80px;
    padding: 0 24px;
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    text-decoration: underline;
}

.doc-content nav {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.doc-content nav a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.doc-content nav a:hover {
    text-decoration: underline;
}

.doc-content h1 {
    font-size: 36px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.doc-content h2 {
    font-size: 28px;
    margin-top: 36px;
    margin-bottom: 16px;
}

.doc-content h3 {
    font-size: 22px;
    margin-top: 28px;
    margin-bottom: 12px;
}

.doc-content p,
.doc-content li {
    color: var(--text-secondary);
}

.doc-content p,
.doc-content ul,
.doc-content ol,
.doc-content table,
.doc-content pre,
.doc-content blockquote {
    margin-bottom: 16px;
}

.doc-content ul,
.doc-content ol {
    padding-left: 24px;
}

.doc-content code {
    font-family: var(--font-mono);
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
}

.doc-content pre {
    background: #1f2328;
    color: #e6edf3;
    padding: 16px;
    border-radius: var(--radius-lg);
    overflow-x: auto;
}

.doc-content pre code {
    background: transparent;
    padding: 0;
    color: inherit;
}

.doc-content table {
    width: 100%;
    border-collapse: collapse;
}

.doc-content th,
.doc-content td {
    padding: 12px;
    border: 1px solid var(--border);
    text-align: left;
}

.doc-content th {
    background: var(--bg-secondary);
}

.doc-content blockquote {
    padding: 12px 16px;
    border-left: 4px solid var(--primary);
    background: var(--bg-secondary);
    border-radius: 0 var(--radius) var(--radius) 0;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header,
.feature-card,
.doc-card,
.step {
    animation: fadeIn 0.5s ease forwards;
}

/* Print styles */
@media print {
    .header,
    .hero-bg,
    .search-box,
    .hero-actions,
    .footer {
        display: none;
    }
    
    .hero {
        background: white;
        color: black;
        padding: 20px 0;
    }
    
    .hero h1,
    .hero-subtitle {
        color: black;
        -webkit-text-fill-color: black;
    }
}