:root {
    --color-primary: #2e8555;
    --color-primary-dark: #29784c;
    --color-text: #1c1e21;
    --color-muted: #606770;
    --color-border: #e3e3e3;
    --color-bg: #ffffff;
    --color-bg-alt: #f6f8fa;
    --color-danger: #c9302c;
    --color-danger-bg: #fdecea;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SFMono-Regular", "Menlo", "Monaco", "Consolas", monospace;
    --sidebar-width: 260px;
    --header-height: 56px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

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

a:hover {
    text-decoration: underline;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.site-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--color-text);
}

.site-title img {
    height: 32px;
    width: auto;
}

.site-title:hover {
    text-decoration: none;
}

.site-nav a {
    font-weight: 500;
    margin-left: 1rem;
}

.site-body {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: calc(100vh - var(--header-height));
}

.sidebar {
    padding: 1.5rem 1rem;
    border-right: 1px solid var(--color-border);
    background: var(--color-bg-alt);
    font-size: 0.95rem;
    overflow-y: auto;
    position: sticky;
    top: var(--header-height);
    max-height: calc(100vh - var(--header-height));
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar li {
    margin: 0.2rem 0;
}

.sidebar .section-label {
    display: block;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 0.8rem;
    color: var(--color-muted);
    margin: 1rem 0 0.25rem;
}

.sidebar a {
    display: block;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    color: var(--color-text);
}

.sidebar a:hover {
    background: #eceef0;
    text-decoration: none;
}

.sidebar a.active {
    background: var(--color-primary);
    color: #fff;
    font-weight: 500;
}

.content {
    padding: 2rem 2.5rem;
    max-width: 900px;
    width: 100%;
}

.content h1 {
    margin-top: 0;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.4rem;
}

.content h2 {
    margin-top: 2rem;
}

.content h3 {
    margin-top: 1.5rem;
}

.content img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

.content code {
    font-family: var(--font-mono);
    background: var(--color-bg-alt);
    padding: 0.1em 0.35em;
    border-radius: 3px;
    font-size: 0.9em;
}

.content pre {
    background: #1e1e2e;
    color: #f8f8f2;
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
}

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

.content table {
    border-collapse: collapse;
    margin: 1rem 0;
    width: 100%;
}

.content th, .content td {
    border: 1px solid var(--color-border);
    padding: 0.5rem 0.75rem;
    text-align: left;
}

.content th {
    background: var(--color-bg-alt);
}

.content blockquote {
    margin: 1rem 0;
    padding: 0.5rem 1rem;
    border-left: 4px solid var(--color-primary);
    background: var(--color-bg-alt);
    color: var(--color-muted);
}

.admonition {
    margin: 1.25rem 0;
    padding: 0.75rem 1rem;
    border-left: 4px solid;
    border-radius: 4px;
}

.admonition-title {
    font-weight: 700;
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 0.85rem;
}

.admonition-danger {
    border-color: var(--color-danger);
    background: var(--color-danger-bg);
    color: #611a15;
}

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

    .sidebar {
        position: static;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

    .content {
        padding: 1.5rem 1rem;
    }
}