:root {
    --text: #1f2937;
    --muted: #64748b;
    --line: #dfe3ea;
    --bg: #f4f5f7;
    --panel: #ffffff;
    --link: #2563eb;
    --dark: #1e293b;
    --note: #f8fafc;
}

* { box-sizing: border-box; }

html { font-size: 16px; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.65;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.top {
    display: flex;
    align-items: baseline;
    gap: 24px;
    padding: 16px 32px;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
}

.brand { font-size: 20px; font-weight: 700; color: var(--dark); }
.brand:hover { text-decoration: none; }
.top-note { color: var(--muted); font-size: 14px; }

.layout {
    display: flex;
    align-items: flex-start;
    gap: 32px;
    max-width: 1180px;
    margin: 0 auto;
    padding: 32px;
}

.side {
    flex: 0 0 240px;
    position: sticky;
    top: 24px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
    padding-right: 8px;
}

.side .group {
    margin: 24px 0 8px;
    font-weight: 600;
    color: var(--dark);
    font-size: 15px;
}

.side .group:first-child { margin-top: 0; }

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

.side a {
    display: block;
    padding: 6px 12px;
    color: var(--text);
    font-size: 15px;
    border-left: 2px solid transparent;
}

.side a:hover { text-decoration: none; background: #eceef2; }
.side a.current { border-left-color: var(--link); color: var(--link); font-weight: 600; background: #eceef2; }

main { flex: 1 1 auto; min-width: 0; }

article {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 40px 48px;
}

h1 { margin: 0 0 24px; font-size: 32px; line-height: 1.25; color: var(--dark); }
h2 { margin: 40px 0 16px; font-size: 22px; line-height: 1.3; color: var(--dark); }
h3 { margin: 28px 0 12px; font-size: 18px; color: var(--dark); }

p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 24px; }
li { margin: 0 0 8px; }
li > ul, li > ol { margin-top: 8px; }

code {
    font-family: Consolas, "SFMono-Regular", Menlo, monospace;
    font-size: 0.92em;
    background: #eef0f4;
    padding: 1px 5px;
    border-radius: 3px;
}

pre {
    margin: 0 0 20px;
    padding: 16px 20px;
    background: #eef0f4;
    border-radius: 4px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.5;
}

pre code { background: none; padding: 0; }

.note {
    margin: 0 0 20px;
    padding: 14px 18px;
    background: var(--note);
    border: 1px solid var(--line);
    border-left: 3px solid var(--link);
    border-radius: 4px;
}

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

.warn { border-left-color: #d97706; }

figure { margin: 0 0 28px; }

figure img {
    display: block;
    max-width: 100%;
    height: auto;
    border: 1px solid var(--line);
    border-radius: 4px;
}

figcaption { margin-top: 8px; font-size: 14px; color: var(--muted); }

table { width: 100%; border-collapse: collapse; margin: 0 0 24px; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 10px 14px; border-bottom: 1px solid var(--line); }
th { font-weight: 600; color: var(--dark); border-bottom: 2px solid var(--line); }

dl { margin: 0 0 24px; }
dt { font-weight: 600; color: var(--dark); margin-top: 20px; }
dd { margin: 6px 0 0; }

details { margin: 0 0 12px; border: 1px solid var(--line); border-radius: 4px; padding: 0 18px; }
summary { padding: 14px 0; cursor: pointer; font-weight: 600; color: var(--dark); }
details[open] summary { border-bottom: 1px solid var(--line); margin-bottom: 14px; }
details p:last-child { margin-bottom: 16px; }

.pager {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 24px;
}

.foot {
    max-width: 1180px;
    margin: 0 auto;
    padding: 8px 32px 40px;
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 860px) {
    .layout { flex-direction: column; padding: 16px; gap: 16px; }
    .side { position: static; flex: none; max-height: none; width: 100%; padding: 0; }
    article { padding: 24px 20px; }
    h1 { font-size: 26px; }
    .top { padding: 14px 16px; }
    .foot { padding: 8px 16px 32px; }
}

.side summary { display: none; }

@media (max-width: 860px) {
    .side summary { display: block; cursor: pointer; padding: 12px 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 4px; font-weight: 600; color: var(--dark); }
    .side details[open] summary { margin-bottom: 12px; }
}