:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-sidebar: #f1f5f9;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --sidebar-width: 260px;
    --header-height: 64px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
}

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

a:hover {
    text-decoration: underline;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
    text-decoration: none;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: 0.3s;
}

.nav-list {
    display: flex;
    gap: 8px;
    list-style: none;
}

.nav-list a {
    padding: 8px 16px;
    color: var(--color-text-light);
    border-radius: 6px;
    transition: 0.2s;
}

.nav-list a:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text);
    text-decoration: none;
}

.main {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    padding-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    padding: 32px 24px;
    background: var(--color-bg-sidebar);
    border-right: 1px solid var(--color-border);
}

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

.sidebar-section h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-light);
    margin-bottom: 12px;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: 4px;
}

.sidebar-nav a {
    display: block;
    padding: 8px 12px;
    color: var(--color-text);
    border-radius: 6px;
    font-size: 0.9rem;
    transition: 0.2s;
}

.sidebar-nav a:hover {
    background: var(--color-bg);
    text-decoration: none;
}

.content {
    flex: 1;
    padding: 48px 64px;
    max-width: 900px;
}

.content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
}

.content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 48px 0 24px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.content h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 32px 0 16px;
}

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

.content .lead {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: 48px;
}

.content ul, .content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.content li {
    margin-bottom: 8px;
}

.content pre {
    background: var(--color-bg-secondary);
    padding: 16px 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 24px;
    border: 1px solid var(--color-border);
}

.content pre code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.7;
}

.content code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875em;
    background: var(--color-bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin: 48px 0;
}

.feature {
    background: var(--color-bg-secondary);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.feature h2 {
    font-size: 1.1rem;
    margin: 0 0 12px;
    padding: 0;
    border: none;
}

.feature p {
    margin: 0;
    font-size: 0.9rem;
}

.quick-start {
    background: var(--color-bg-secondary);
    padding: 32px;
    border-radius: 12px;
    margin-top: 48px;
}

.quick-start h2 {
    margin-top: 0;
    padding-top: 0;
    border: none;
}

.footer {
    text-align: center;
    padding: 32px;
    color: var(--color-text-light);
    font-size: 0.875rem;
    border-top: 1px solid var(--color-border);
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-list {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: 16px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }

    .nav-list.active {
        display: flex;
    }

    .nav-list a {
        padding: 12px 16px;
    }

    .sidebar {
        display: none;
    }

    .sidebar.active {
        display: block;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        z-index: 99;
    }

    .content {
        padding: 24px;
    }

    .content h1 {
        font-size: 1.75rem;
    }
}