:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --text-tertiary: #6e7681;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-purple: #bc8cff;
    --accent-red: #f85149;
    --accent-yellow: #e3b341;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Layout GitHub-like */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header Navigation */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 18px;
}

.nav-brand img {
    width: 32px;
    height: 32px;
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--accent-blue);
}

.nav-links a.active {
    color: var(--text-primary);
    font-weight: 500;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 48px;
    padding: 48px 0;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 100px;
    align-self: start;
}

.sidebar-section {
    margin-bottom: 32px;
}

.sidebar-section h3 {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

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

.sidebar-links li {
    margin-bottom: 8px;
}

.sidebar-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    display: block;
    padding: 6px 12px;
    border-radius: 6px;
    transition: all 0.2s;
}

.sidebar-links a:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-links a.active {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 500;
    border-left: 3px solid var(--accent-blue);
}

/* Content */
.content {
    min-width: 0;
}

.hero {
    margin-bottom: 64px;
    padding: 40px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--accent-purple)20, transparent 50%);
    opacity: 0.1;
}

.hero h1 {
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-width: 600px;
}

.hero-badges {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge.primary {
    background-color: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.section {
    margin-bottom: 64px;
    scroll-margin-top: 100px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.section-header h2 {
    font-size: 32px;
    font-weight: 600;
}

.section-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    font-size: 20px;
}

/* Cards */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin: 24px 0;
}

.feature-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border-radius: 12px;
    margin-bottom: 16px;
    font-size: 24px;
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

/* Code Blocks */
.code-container {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin: 24px 0;
    overflow: hidden;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background-color: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
}

.code-title {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 14px;
    color: var(--text-secondary);
}

.code-copy {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.code-copy:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.code-block {
    padding: 20px;
    overflow-x: auto;
}

pre[class*="language-"] {
    margin: 0;
    background: transparent !important;
}

.code-block code {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 13px;
    line-height: 1.5;
}

/* Steps */
.steps {
    counter-reset: step-counter;
}

.step {
    display: flex;
    margin-bottom: 32px;
    padding-left: 60px;
    position: relative;
}

.step::before {
    counter-increment: step-counter;
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 40px;
    background-color: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.step-content h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* Comparison Table */
.comparison {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.comparison th,
.comparison td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.comparison tr:last-child td {
    border-bottom: none;
}

.check {
    color: var(--accent-green);
    font-weight: 600;
}

.cross {
    color: var(--accent-red);
    font-weight: 600;
}

/* Demo Section */
.demo-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    margin: 24px 0;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 10px 16px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.btn {
    padding: 10px 24px;
    background-color: var(--accent-blue);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn:hover {
    background-color: #4a93ff;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

/* Preview */
.preview-container {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-top: 24px;
}

.preview-image {
    max-width: 100%;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 48px 0;
    margin-top: 64px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .sidebar {
        position: static;
        order: 2;
    }

    .content {
        order: 1;
    }
}

@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 16px;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 36px;
    }

    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
}