:root {
    --bg: #ffffff;
    --bg-soft: #f7f8fa;
    --bg-sidebar: #fafbfc;
    --text: #1f2328;
    --text-soft: #57606a;
    --text-muted: #8b949e;
    --link: #0969da;
    --link-hover: #0550ae;
    --border: #e6e8eb;
    --border-strong: #d0d7de;

    --topbar-bg: #0d1117;
    --topbar-bg-2: #161b22;
    --topbar-text: #e6edf3;
    --topbar-text-muted: #9da7b3;
    --topbar-active: #ffffff;

    --code-bg: #0d1117;
    --code-text: #e6edf3;
    --code-keyword: #ff7b72;
    --code-string: #a5d6ff;
    --code-comment: #8b949e;

    --inline-code-bg: #f3f4f6;
    --inline-code-text: #d6336c;

    --topbar-height: 56px;
    --sidebar-width: 260px;
    --toc-width: 240px;
    --content-max: 760px;

    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.06);

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--topbar-height) + 16px);
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.65;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}

a {
    color: var(--link);
    text-decoration: none;
    transition: color 120ms ease;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
    text-underline-offset: 2px;
}

::selection {
    background: rgba(9, 105, 218, 0.18);
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--topbar-height);
    background: var(--topbar-bg);
    border-bottom: 1px solid #21262d;
    color: var(--topbar-text);
}

.topbar-inner {
    height: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 32px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--topbar-active);
    font-weight: 700;
    font-size: 16px;
    letter-spacing: -0.01em;
}

.brand:hover {
    color: var(--topbar-active);
    text-decoration: none;
}

.brand-mark {
    font-size: 20px;
}

.topnav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    margin-left: 12px;
}

.topnav-link {
    color: var(--topbar-text-muted);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: 8px 12px;
    border-radius: 6px;
    transition: background 120ms ease, color 120ms ease;
}

.topnav-link:hover {
    background: var(--topbar-bg-2);
    color: var(--topbar-active);
    text-decoration: none;
}

.topnav-link.active {
    color: var(--topbar-active);
    background: var(--topbar-bg-2);
}

.topbar-github {
    color: var(--topbar-text);
    font-size: 13px;
    font-weight: 600;
    padding: 8px 14px;
    border: 1px solid #30363d;
    border-radius: 6px;
    transition: background 120ms ease, border-color 120ms ease;
}

.topbar-github:hover {
    background: var(--topbar-bg-2);
    border-color: #484f58;
    color: var(--topbar-active);
    text-decoration: none;
}

.menu-toggle {
    display: none;
    background: transparent;
    border: 1px solid #30363d;
    color: var(--topbar-text);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 18px;
    cursor: pointer;
}

.layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr) var(--toc-width);
    max-width: 1400px;
    margin: 0 auto;
    align-items: flex-start;
}

.sidebar {
    position: sticky;
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    overflow-y: auto;
    border-right: 1px solid var(--border);
    background: var(--bg-sidebar);
}

.sidebar-inner {
    padding: 20px 16px 40px;
}

.sidebar-search input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-strong);
    border-radius: 6px;
    background: var(--bg);
    font: inherit;
    font-size: 13px;
    color: var(--text);
    outline: none;
    transition: border-color 120ms ease, box-shadow 120ms ease;
}

.sidebar-search input:focus {
    border-color: var(--link);
    box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.12);
}

.sidebar-nav {
    margin-top: 18px;
}

.sidebar-caption {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin: 16px 8px 6px;
}

.sidebar-nav ul {
    list-style: none;
    margin: 0 0 4px;
    padding: 0;
}

.sidebar-link {
    display: block;
    padding: 6px 10px;
    margin: 1px 0;
    color: var(--text-soft);
    font-size: 14px;
    border-radius: 6px;
    transition: background 100ms ease, color 100ms ease;
}

.sidebar-link:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--text);
    text-decoration: none;
}

.sidebar-link.active {
    background: rgba(9, 105, 218, 0.10);
    color: var(--link);
    font-weight: 600;
}

.main {
    min-width: 0;
    padding: 32px 40px 0;
}

.article {
    max-width: var(--content-max);
    margin: 0 auto;
}

.breadcrumbs {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 18px;
}

.breadcrumbs a {
    color: var(--text-muted);
}

.breadcrumbs .sep {
    margin: 0 6px;
    color: var(--border-strong);
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4 {
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.015em;
    line-height: 1.25;
    scroll-margin-top: calc(var(--topbar-height) + 16px);
}

.article-body h1 {
    font-size: 36px;
    margin: 0 0 8px;
    letter-spacing: -0.025em;
}

.article-body h2 {
    font-size: 24px;
    margin: 40px 0 12px;
    padding-top: 8px;
}

.article-body h3 {
    font-size: 18px;
    margin: 28px 0 10px;
}

.article-body h4 {
    font-size: 16px;
    margin: 20px 0 8px;
}

.article-body p {
    margin: 0 0 16px;
    color: var(--text);
}

.article-body strong {
    font-weight: 600;
    color: var(--text);
}

.article-body em {
    color: var(--text-soft);
}

.article-body a.headerlink {
    visibility: hidden;
    margin-left: 8px;
    color: var(--text-muted);
    font-weight: 400;
}

.article-body h1:hover a.headerlink,
.article-body h2:hover a.headerlink,
.article-body h3:hover a.headerlink,
.article-body h4:hover a.headerlink {
    visibility: visible;
}

.article-body ul,
.article-body ol {
    margin: 0 0 16px;
    padding-left: 24px;
}

.article-body li {
    margin: 4px 0;
}

.article-body hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 32px 0;
}

code,
.article-body code,
tt {
    font-family: var(--font-mono);
    font-size: 0.86em;
    background: var(--inline-code-bg);
    color: var(--inline-code-text);
    padding: 2px 6px;
    border-radius: 4px;
    white-space: nowrap;
    border: none;
}

a code {
    color: inherit;
}

pre {
    font-family: var(--font-mono);
    background: var(--code-bg);
    color: var(--code-text);
    padding: 16px 18px;
    border-radius: var(--radius);
    font-size: 13px;
    line-height: 1.6;
    overflow-x: auto;
    margin: 0 0 18px;
    white-space: pre;
    border: 1px solid #21262d;
    box-shadow: var(--shadow-sm);
}

pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
    border: none;
    white-space: pre;
    border-radius: 0;
}

.highlight,
.highlight pre {
    background: var(--code-bg);
}

.highlight .k,
.highlight .kn,
.highlight .kd {
    color: var(--code-keyword);
}

.highlight .s,
.highlight .s1,
.highlight .s2 {
    color: var(--code-string);
}

.highlight .c,
.highlight .c1,
.highlight .cm {
    color: var(--code-comment);
    font-style: italic;
}

.admonition {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-left: 4px solid var(--link);
    padding: 14px 16px;
    margin: 18px 0;
    border-radius: var(--radius);
    color: var(--text);
}

.admonition p {
    margin: 0 0 8px;
}

.admonition p:last-child {
    margin-bottom: 0;
}

.admonition p.first {
    font-weight: 700;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--link);
    margin: 0 0 8px;
}

.admonition.tip {
    border-left-color: #1a7f37;
    background: #f0fdf4;
}

.admonition.tip p.first {
    color: #1a7f37;
}

.admonition.warning {
    border-left-color: #bf8700;
    background: #fff8e1;
}

.admonition.warning p.first {
    color: #9a6700;
}

.admonition.note {
    border-left-color: var(--link);
    background: #f0f7ff;
}

.admonition.note p.first {
    color: var(--link);
}

table.docutils,
.article-body table {
    border-collapse: collapse;
    width: 100%;
    margin: 0 0 24px;
    font-size: 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

table.docutils th,
table.docutils td,
.article-body th,
.article-body td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

table.docutils thead,
.article-body thead {
    background: var(--bg-soft);
}

table.docutils th,
.article-body th {
    font-weight: 600;
    font-size: 13px;
    color: var(--text-soft);
}

table.docutils tbody tr:last-child td,
.article-body tbody tr:last-child td {
    border-bottom: none;
}

dl.option {
    margin: 18px 0;
}

dl.option>dt {
    font-family: var(--font-mono);
    font-size: 13px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-left: 3px solid var(--link);
    padding: 8px 12px;
    margin-top: 14px;
    border-radius: var(--radius);
    color: var(--text);
}

dl.option>dd {
    margin: 8px 0 16px 4px;
    color: var(--text-soft);
}

.toctree-wrapper ul {
    list-style: none;
    padding-left: 0;
}

.toctree-wrapper>ul>li {
    margin: 6px 0;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    transition: border-color 120ms ease, box-shadow 120ms ease, transform 120ms ease;
}

.toctree-wrapper>ul>li:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
}

.toctree-wrapper>ul>li>a {
    font-weight: 600;
    color: var(--text);
}

.toctree-wrapper>ul>li>ul {
    list-style: disc;
    margin: 6px 0 0 20px;
    padding: 0;
}

.toctree-wrapper>ul>li>ul>li {
    font-size: 13px;
    margin: 2px 0;
}

.pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 48px 0 24px;
}

.pager-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 18px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--bg);
    color: var(--text);
    transition: border-color 120ms ease, box-shadow 120ms ease, transform 120ms ease;
    min-height: 78px;
}

.pager-card:hover {
    border-color: var(--link);
    box-shadow: var(--shadow-md);
    text-decoration: none;
    transform: translateY(-1px);
}

.pager-prev {
    align-items: flex-start;
    text-align: left;
}

.pager-next {
    align-items: flex-end;
    text-align: right;
}

.pager-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.pager-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
}

.pager-card:hover .pager-title {
    color: var(--link);
}

.toc {
    position: sticky;
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    overflow-y: auto;
    padding: 32px 24px 40px 8px;
    font-size: 13px;
}

.toc-empty {
    visibility: hidden;
}

.toc-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin: 0 0 10px;
}

.toc ul {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 1px solid var(--border);
}

.toc li.toc-l3 {
    padding-left: 14px;
}

.toc a {
    display: block;
    padding: 4px 12px;
    margin-left: -1px;
    color: var(--text-soft);
    border-left: 1px solid transparent;
    line-height: 1.4;
    transition: color 120ms ease, border-color 120ms ease;
}

.toc a:hover {
    color: var(--text);
    text-decoration: none;
}

.toc a.active {
    color: var(--link);
    border-left-color: var(--link);
    font-weight: 600;
}

.toc-top {
    display: inline-block;
    margin-top: 16px;
    padding-left: 12px;
    color: var(--text-muted);
    font-size: 12px;
}

.site-footer {
    margin: 64px auto 0;
    max-width: var(--content-max);
    padding: 32px 0 48px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 13px;
}

.footer-cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 24px;
}

.site-footer h4 {
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 10px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.site-footer li {
    margin: 4px 0;
}

.site-footer a {
    color: var(--text-soft);
}

.site-footer a:hover {
    color: var(--link);
}

.footer-bottom {
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    margin: 0;
}

@media (max-width: 1180px) {
    .layout {
        grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    }

    .toc {
        display: none;
    }
}

@media (max-width: 860px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .topnav {
        display: none;
    }

    .menu-toggle {
        display: inline-block;
        margin-left: auto;
    }

    .topbar-github {
        display: none;
    }

    .sidebar {
        position: fixed;
        top: var(--topbar-height);
        left: 0;
        bottom: 0;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 200ms ease;
        z-index: 40;
        box-shadow: var(--shadow-md);
    }

    body.nav-open .sidebar {
        transform: translateX(0);
    }

    .main {
        padding: 24px 20px 0;
    }

    .article-body h1 {
        font-size: 28px;
    }

    .pager {
        grid-template-columns: 1fr;
    }

    .footer-cols {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
}