:root {
  --blue: #2f6bff;
  --blue-ink: #1d4fd8;
  --blue-soft: #eef3ff;
  --ink: #16202f;
  --ink-2: #4a5568;
  --ink-3: #718096;
  --bg: #ffffff;
  --bg-2: #f6f8fc;
  --code-bg: #f3f6fb;
  --warn-bg: #fff8e6;
  --warn-ink: #8a5a00;
  --radius: 10px;
  --top: 56px;
  --side: 264px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top) + 16px); -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 16px/1.75 var(--font); color: var(--ink); background: var(--bg); }
a { color: var(--blue-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--blue); color: #fff; padding: 6px 12px; border-radius: 6px; z-index: 50; }
.skip:focus { left: 8px; }

/* 顶栏 */
.topbar { position: sticky; top: 0; z-index: 20; height: var(--top); display: flex; align-items: center; gap: 12px; padding: 0 20px; background: rgba(255,255,255,.92); backdrop-filter: saturate(1.6) blur(10px); box-shadow: 0 1px 0 rgba(22,32,47,.06); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; color: var(--ink); }
.brand:hover { text-decoration: none; }
.logo { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: linear-gradient(135deg, #4d86ff, #2052e0); color: #fff; font-weight: 800; font-size: 15px; }
.badge { font-size: 12px; color: var(--blue-ink); background: var(--blue-soft); padding: 2px 10px; border-radius: 999px; white-space: nowrap; }
.toplinks { margin-left: auto; display: flex; gap: 18px; font-size: 14px; }
.toplinks a { color: var(--ink-2); }
.menu-btn { display: none; border: 0; background: none; color: var(--ink); padding: 8px; margin-left: -8px; border-radius: 8px; cursor: pointer; }

/* 布局 */
.shell { display: grid; grid-template-columns: var(--side) minmax(0, 1fr); max-width: 1280px; margin: 0 auto; }
.sidebar { position: sticky; top: var(--top); height: calc(100vh - var(--top)); overflow-y: auto; padding: 24px 12px 40px 20px; }
.nav-group { margin-bottom: 18px; }
.nav-title { margin: 0 0 4px 10px; font-size: 12px; font-weight: 650; letter-spacing: .04em; color: var(--ink-3); }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar a { display: block; padding: 5px 10px; border-radius: 8px; color: var(--ink-2); font-size: 14.5px; line-height: 1.5; }
.sidebar a:hover { background: var(--bg-2); color: var(--ink); text-decoration: none; }
.sidebar a[aria-current="page"] { background: var(--blue-soft); color: var(--blue-ink); font-weight: 600; }
.content { min-width: 0; padding: 32px 48px 64px; }
.doc { max-width: 780px; }

/* 正文 */
.doc h1 { font-size: 32px; line-height: 1.3; margin: 0 0 12px; letter-spacing: -.01em; }
.doc h2 { font-size: 22px; line-height: 1.4; margin: 44px 0 12px; }
.doc h3 { font-size: 18px; margin: 28px 0 8px; }
.doc p, .doc ul, .doc ol { margin: 0 0 14px; }
.doc ul, .doc ol { padding-left: 1.4em; }
.doc li { margin: 4px 0; }
.doc .lead { font-size: 18px; color: var(--ink-2); }
.doc hr { border: 0; height: 1px; background: rgba(22,32,47,.08); margin: 36px 0; }
.doc strong { font-weight: 650; }
.doc code { font-family: var(--mono); font-size: .88em; background: var(--code-bg); padding: .12em .4em; border-radius: 5px; }
.doc pre { position: relative; padding-right: 72px !important; background: var(--code-bg); border-radius: var(--radius); padding: 14px 16px; overflow-x: auto; margin: 0 0 16px; line-height: 1.6; }
.doc pre code { background: none; padding: 0; font-size: 13.5px; white-space: pre; }
.copy-btn { position: absolute; top: 8px; right: 8px; border: 0; background: #fff; color: var(--ink-2); font: 12px var(--font); padding: 3px 10px; border-radius: 6px; cursor: pointer; box-shadow: 0 1px 2px rgba(22,32,47,.12); }
.copy-btn:hover { color: var(--blue-ink); }
.doc table { width: 100%; border-collapse: collapse; margin: 0 0 18px; font-size: 14.5px; display: block; overflow-x: auto; }
.doc th, .doc td { text-align: left; padding: 9px 12px; vertical-align: top; }
.doc thead th { background: var(--bg-2); font-weight: 600; white-space: nowrap; }
.doc tbody tr:nth-child(even) { background: #fafbfe; }
.doc blockquote { margin: 0 0 16px; padding: 12px 16px; background: var(--blue-soft); border-radius: var(--radius); color: var(--ink); }
.doc blockquote p:last-child { margin-bottom: 0; }
.doc blockquote.warn { background: var(--warn-bg); color: var(--warn-ink); }

/* 首页卡片 */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; margin: 8px 0 24px; padding: 0 !important; list-style: none; }
.cards li { margin: 0; }
.cards a { display: block; height: 100%; padding: 16px 18px; border-radius: 12px; background: var(--bg-2); color: var(--ink); transition: background .15s, transform .15s; }
.cards a:hover { background: var(--blue-soft); text-decoration: none; transform: translateY(-1px); }
.cards strong { display: block; color: var(--blue-ink); margin-bottom: 2px; }
.cards span { font-size: 14px; color: var(--ink-2); }

.doc-footer { max-width: 780px; margin-top: 56px; padding-top: 18px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; font-size: 13.5px; color: var(--ink-3); box-shadow: 0 -1px 0 rgba(22,32,47,.06); }

@media (max-width: 900px) {
  .menu-btn { display: inline-flex; }
  .toplinks, .badge { display: none; }
  .shell { display: block; }
  .sidebar { position: fixed; left: 0; top: var(--top); bottom: 0; width: 280px; height: auto; background: #fff; z-index: 15; transform: translateX(-100%); transition: transform .2s; box-shadow: 8px 0 24px rgba(22,32,47,.08); }
  body.nav-open .sidebar { transform: none; }
  .content { padding: 24px 20px 48px; }
  .doc h1 { font-size: 26px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* 文本类代码框（一句话安装、示例说法）自动换行 */
.doc .language-text pre, .doc pre code.language-text, .doc .language-text code { white-space: pre-wrap; word-break: break-all; }
.doc .language-text pre { font-size: 15px; }