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

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-border: #e2e8f0;
    --color-code-bg: #1e293b;
    --color-code-text: #e2e8f0;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    --max-width: 1200px;
    --border-radius: 8px;
    --transition: 150ms ease;
    --header-height: 64px;
    --sidebar-width: 240px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    padding-top: var(--header-height);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.logo svg {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text span:first-child {
    font-weight: 700;
}

.logo-text span:last-child {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

.header-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.header-nav a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition);
    padding: var(--spacing-sm) 0;
}

.header-nav a:hover,
.header-nav a[aria-current="page"] {
    color: var(--color-primary);
}

main {
    padding: var(--spacing-xl) 0;
}

.hero {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: var(--color-bg-alt);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xl);
}

.hero h1 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero p {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--color-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: background var(--transition);
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    background: var(--color-primary-dark);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: box-shadow var(--transition);
}

.feature-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--color-text-light);
}

.content-section {
    background: var(--color-bg-alt);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.content-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.content-section p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.docs-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: 0;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    align-items: start;
}

.sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-lg));
    align-self: start;
    padding-right: var(--spacing-lg);
    border-right: 1px solid var(--color-border);
}

.sidebar-nav {
    list-style: none;
    display: flex;
    flex-direction: column;
}

.sidebar-nav li {
    display: block;
    width: 100%;
}

.sidebar-nav a {
    display: block;
    width: 100%;
    padding: 0.45rem 0.75rem;
    text-decoration: none;
    color: var(--color-text-light);
    font-size: 0.9rem;
    border-radius: 6px;
    transition: color var(--transition), background var(--transition);
    line-height: 1.5;
}

.sidebar-nav a:hover {
    color: var(--color-primary);
    background: #eff6ff;
}

.sidebar-nav a.active {
    color: var(--color-primary);
    font-weight: 600;
    background: #eff6ff;
}

.docs-content {
    min-width: 0;
    padding-left: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
}

.docs-content h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.docs-content h2 {
    font-size: 1.375rem;
    font-weight: 700;
    margin: var(--spacing-lg) 0 var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.docs-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: var(--spacing-lg) 0 var(--spacing-sm);
}

.docs-content p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.docs-content ul,
.docs-content ol {
    margin: 0 0 var(--spacing-md) var(--spacing-lg);
    color: var(--color-text-light);
}

.docs-content li {
    margin-bottom: var(--spacing-sm);
}

.code-block {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.5;
}

.code-block code {
    white-space: pre;
}

.endpoint {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    margin: var(--spacing-sm) 0;
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.method {
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}

.method.get {
    background: #22c55e;
    color: white;
}

.method.post {
    background: #3b82f6;
    color: white;
}

.note {
    background: var(--color-bg-alt);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-md);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    margin: var(--spacing-md) 0;
    font-size: 0.9375rem;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

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

.breadcrumb a:hover {
    text-decoration: underline;
}

footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

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

footer a:hover {
    text-decoration: underline;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 900px) {
    :root {
        --header-height: 60px;
    }

    .header-inner {
        padding: 0 var(--spacing-md);
    }

    .docs-layout {
        grid-template-columns: 1fr;
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .sidebar {
        position: static;
        align-self: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        padding-right: 0;
        padding-bottom: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }

    .sidebar-nav {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .sidebar-nav li {
        width: auto;
    }

    .docs-content {
        padding-left: 0;
    }

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

    .hero p {
        font-size: 1rem;
    }

    .header-nav ul {
        gap: var(--spacing-md);
    }
}

@media (max-width: 600px) {
    .hero {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .docs-layout {
        padding: var(--spacing-md);
    }
}

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