/* BabiaLab — 02_vercel 风纯黑白文档站 */

:root {
  --vd-bg: #fff;
  --vd-bg-soft: #fafafa;
  --vd-bg-mute: #f4f4f5;
  --vd-bg-code: #0a0a0a;
  --vd-fg: #171717;
  --vd-fg-2: #404040;
  --vd-fg-3: #737373;
  --vd-fg-4: #a3a3a3;
  --vd-border: #e5e5e5;
  --vd-border-soft: #f0f0f0;
  --vd-accent: #0a0a0a;
  --vd-accent-bg: #f4f4f5;
  --vd-warn: #b45309;
  --vd-warn-bg: #fef3c7;
  --vd-max: 720px;
  --vd-side: 244px;
  --vd-toc: 220px;
  --vd-h: 56px;
  --vd-r-sm: 4px;
  --vd-r: 6px;
  --vd-r-lg: 8px;
  --vd-fs-base: 14.5px;
  --vd-fs-art: 15.5px;
  --vd-font: -apple-system, BlinkMacSystemFont, 'Inter', 'Geist', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', Roboto, Arial, sans-serif;
  --vd-font-mono: 'Geist Mono', 'SF Mono', Menlo, Consolas, 'Courier New', monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: var(--vd-font);
  font-size: var(--vd-fs-base);
  line-height: 1.6;
  color: var(--vd-fg);
  background: var(--vd-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--vd-fg); text-decoration: none; }
a:hover { text-decoration: none; color: var(--vd-fg-2); }
img, svg { max-width: 100%; vertical-align: middle; }
button { font-family: inherit; }

/* ===== Alert banner ===== */
.alert-banner {
  display: flex; justify-content: center; align-items: center; gap: 12px;
  padding: 8px 16px;
  background: #fff7ed; color: #9a3412;
  border-bottom: 1px solid #fed7aa;
  font-size: 13px;
}
.alert-cta {
  font-weight: 600; padding: 4px 12px;
  background: #0a0a0a; color: #fff;
  border-radius: 999px;
  font-size: 12px;
}
.alert-cta:hover { color: #fff; background: #404040; }

/* ===== Header (Vercel-like) ===== */
.vh-header {
  position: sticky; top: 0; z-index: 30;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--vd-border);
}
.vh-inner {
  max-width: 1440px; margin: 0 auto; padding: 0 24px;
  height: var(--vd-h);
  display: flex; align-items: center; gap: 28px;
}
.vh-brand {
  display: flex; align-items: center; gap: 6px;
  color: var(--vd-fg); font-weight: 600; font-size: 15px;
  letter-spacing: -0.01em;
}
.vh-brand:hover { color: var(--vd-fg); }
.vh-brand-text { font-family: var(--vd-font); }
.vh-nav {
  display: flex; align-items: center; gap: 2px;
  margin-right: auto;
}
.vh-nav a {
  color: var(--vd-fg-2); font-size: 13.5px; font-weight: 500;
  padding: 6px 10px; border-radius: var(--vd-r-sm);
}
.vh-nav a:hover { background: var(--vd-bg-mute); color: var(--vd-fg); }
.vh-tools { display: flex; align-items: center; gap: 12px; }
.vh-search {
  display: flex; align-items: center; gap: 6px;
  height: 30px; padding: 0 8px 0 10px;
  border: 1px solid var(--vd-border); border-radius: var(--vd-r-sm);
  background: var(--vd-bg-soft); color: var(--vd-fg-3);
  min-width: 220px;
}
.vh-search svg { color: var(--vd-fg-4); flex-shrink: 0; }
.vh-search input {
  flex: 1; border: 0; outline: 0; background: transparent;
  font-size: 12.5px; color: var(--vd-fg); font-family: inherit;
}
.vh-search input::placeholder { color: var(--vd-fg-4); }
.vh-search kbd {
  font-family: var(--vd-font-mono); font-size: 10.5px;
  padding: 1px 5px; border-radius: 3px;
  background: var(--vd-bg); border: 1px solid var(--vd-border);
  color: var(--vd-fg-3);
}
.vh-langs { display: flex; gap: 1px; }
.vh-langs a {
  font-size: 11px; font-weight: 600;
  padding: 3px 5px; border-radius: 3px;
  color: var(--vd-fg-4);
}
.vh-langs a:hover { color: var(--vd-fg); background: var(--vd-bg-mute); }
.vh-langs a.active { color: var(--vd-fg); background: var(--vd-bg-mute); }

/* ===== Docs shell (3-col) ===== */
.vd-shell {
  max-width: 1440px; margin: 0 auto; padding: 0 24px;
  display: grid;
  grid-template-columns: var(--vd-side) minmax(0, 1fr) var(--vd-toc);
  gap: 36px;
  align-items: flex-start;
}
.vd-home-shell .vd-toc { display: none; }
.vd-home-shell { grid-template-columns: var(--vd-side) minmax(0, 1fr); }

/* ===== Sidebar ===== */
.vd-side {
  position: sticky;
  top: var(--vd-h);
  height: calc(100vh - var(--vd-h));
  overflow-y: auto;
  padding: 22px 0 36px;
  font-size: 13px;
}
.vd-side-inner { padding-right: 8px; }
.vd-side-home {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 8px;
  font-weight: 500; color: var(--vd-fg);
  border-radius: var(--vd-r-sm);
  margin-bottom: 16px;
}
.vd-side-home:hover { background: var(--vd-bg-mute); color: var(--vd-fg); }
.vd-side-section {
  margin-bottom: 4px;
}
.vd-side-section[open] .vd-chev { transform: rotate(90deg); }
.vd-side-title {
  list-style: none;
  display: flex; align-items: center; gap: 6px;
  padding: 5px 8px;
  font-size: 12.5px; font-weight: 600; color: var(--vd-fg);
  cursor: pointer;
  border-radius: var(--vd-r-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.vd-side-title::-webkit-details-marker { display: none; }
.vd-side-title:hover { background: var(--vd-bg-mute); }
.vd-chev {
  display: inline-flex; color: var(--vd-fg-3);
  transition: transform 0.15s;
}
.vd-side-count {
  margin-left: auto;
  font-size: 11px; font-weight: 500;
  color: var(--vd-fg-4);
  background: var(--vd-bg-mute);
  border-radius: 999px;
  padding: 1px 6px;
}
.vd-side-list { list-style: none; padding: 4px 0 4px 14px; margin: 0; }
.vd-side-list li { line-height: 1.4; }
.vd-side-list a {
  display: block;
  padding: 4px 8px;
  font-size: 12.5px; color: var(--vd-fg-3);
  border-left: 1px solid var(--vd-border);
  margin-left: -1px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.vd-side-list a:hover { color: var(--vd-fg); border-left-color: var(--vd-fg-3); background: transparent; }
.vd-side-list li.active a {
  color: var(--vd-fg); font-weight: 500;
  border-left-color: var(--vd-fg);
}
.vd-side-more a { color: var(--vd-fg-4); font-size: 11.5px; padding: 3px 8px; }
.vd-side-more a:hover { color: var(--vd-fg); }

/* ===== Article (middle) ===== */
.vd-article {
  padding: 28px 0 80px;
  min-width: 0;
}
.vd-art-head { margin-bottom: 22px; padding-bottom: 14px; border-bottom: 1px solid var(--vd-border); }
.vd-art-head h1 {
  font-size: 32px; font-weight: 700; letter-spacing: -0.015em;
  margin: 0 0 8px; line-height: 1.2;
}
.vd-art-sub { font-size: 15px; color: var(--vd-fg-3); margin: 0 0 8px; }
.vd-art-meta {
  font-size: 12.5px; color: var(--vd-fg-4); margin: 0;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.vd-sep { color: var(--vd-border); }
.vd-art-meta a { color: var(--vd-fg); border-bottom: 1px dotted var(--vd-fg-3); }
.vd-art-meta a:hover { color: var(--vd-fg); border-bottom-color: var(--vd-fg); }

/* Breadcrumb */
.vd-crumb { margin-bottom: 16px; }
.vd-crumb ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.vd-crumb li { font-size: 12px; color: var(--vd-fg-4); }
.vd-crumb li:not(:last-child)::after { content: '/'; margin-left: 8px; color: var(--vd-border); }
.vd-crumb a { color: var(--vd-fg-3); }
.vd-crumb a:hover { color: var(--vd-fg); }
.vd-crumb li[aria-current="page"] { color: var(--vd-fg); }

/* Prose body */
.vd-prose {
  font-size: var(--vd-fs-art);
  line-height: 1.75;
  max-width: var(--vd-max);
  color: var(--vd-fg);
}
.vd-prose > * { max-width: 100%; }
.vd-prose h2 {
  font-size: 22px; font-weight: 700; letter-spacing: -0.005em;
  margin: 40px 0 12px; padding-top: 4px;
  scroll-margin-top: 80px;
}
.vd-prose h3 {
  font-size: 17px; font-weight: 600;
  margin: 28px 0 8px;
  scroll-margin-top: 80px;
}
.vd-prose h4 { font-size: 15px; font-weight: 600; margin: 22px 0 6px; }
.vd-prose p { margin: 12px 0; }
.vd-prose ul, .vd-prose ol { margin: 12px 0; padding-left: 22px; }
.vd-prose li { margin: 4px 0; }
.vd-prose strong { font-weight: 600; color: var(--vd-fg); }
.vd-prose a {
  color: var(--vd-fg);
  border-bottom: 1px solid var(--vd-fg-3);
  text-underline-offset: 2px;
}
.vd-prose a:hover { color: var(--vd-fg); border-bottom-color: var(--vd-fg); background: var(--vd-bg-mute); }
.vd-prose blockquote {
  margin: 16px 0;
  padding: 10px 16px;
  border-left: 3px solid var(--vd-fg);
  background: var(--vd-bg-soft);
  border-radius: 0 var(--vd-r) var(--vd-r) 0;
  color: var(--vd-fg-2);
}
.vd-prose blockquote p { margin: 6px 0; }
.vd-prose code {
  font-family: var(--vd-font-mono); font-size: 0.85em;
  padding: 2px 5px; border-radius: 3px;
  background: var(--vd-bg-mute);
  color: var(--vd-fg);
  border: 1px solid var(--vd-border-soft);
}
.vd-prose pre {
  margin: 18px 0;
  background: var(--vd-bg-code);
  border: 1px solid #1f1f1f; border-radius: var(--vd-r);
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--vd-font-mono); font-size: 13px;
  line-height: 1.55;
  color: #e5e5e5;
}
.vd-prose pre code {
  font-family: inherit; font-size: inherit;
  padding: 0; background: transparent; border: 0; color: inherit;
}
.vd-prose table {
  width: 100%; border-collapse: collapse;
  margin: 18px 0; font-size: 13.5px;
  border: 1px solid var(--vd-border); border-radius: var(--vd-r); overflow: hidden;
}
.vd-prose th, .vd-prose td {
  text-align: left; padding: 9px 12px;
  border-bottom: 1px solid var(--vd-border-soft);
}
.vd-prose th { background: var(--vd-bg-soft); font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--vd-fg-2); }
.vd-prose tr:last-child td { border-bottom: 0; }
.vd-prose hr { border: 0; border-top: 1px solid var(--vd-border); margin: 32px 0; }

.vd-prose p > strong:first-child:only-child { display: block; margin: 12px 0 0; }

/* List page links should NOT be underlined */
.vd-list a, .vd-list a:hover,
.vd-list-row, .vd-list-row:hover,
.vd-cat-card, .vd-cat-card:hover,
.vd-qr-card, .vd-qr-card:hover,
.vd-block-list a, .vd-block-list a:hover,
.vd-latest-row, .vd-latest-row:hover {
  border-bottom: 0;
  background: transparent;
}

/* ===== TOC + tools (Vercel right rail) ===== */
.vd-toc {
  position: sticky;
  top: var(--vd-h);
  align-self: start;
  padding: 28px 0;
  font-size: 12.5px;
  max-height: calc(100vh - var(--vd-h));
  overflow-y: auto;
}
.vd-toc-title {
  font-size: 11px; font-weight: 600; color: var(--vd-fg);
  text-transform: uppercase; letter-spacing: 0.06em;
  margin: 0 0 8px; padding: 0 12px;
}
.vd-toc-list { list-style: none; padding: 0; margin: 0 0 20px; border-left: 1px solid var(--vd-border); }
.vd-toc-list li { line-height: 1.4; }
.vd-toc-list a {
  display: block; padding: 4px 12px;
  margin-left: -1px;
  font-size: 12.5px; color: var(--vd-fg-3);
  border-left: 1px solid transparent;
}
.vd-toc-list a:hover { color: var(--vd-fg); }
.vd-toc-list a.active { color: var(--vd-fg); border-left-color: var(--vd-fg); font-weight: 500; }
.vd-l3 a { padding-left: 22px; font-size: 12px; }

.vd-toc-tools {
  list-style: none; padding: 0 12px; margin: 0;
  display: flex; flex-direction: column; gap: 2px;
  border-top: 1px solid var(--vd-border);
  padding-top: 14px;
}
.vd-tool {
  display: inline-flex; align-items: center; gap: 6px;
  width: 100%; text-align: left;
  padding: 6px 8px;
  font-family: inherit; font-size: 12px; font-weight: 500;
  color: var(--vd-fg-2);
  background: transparent; border: 0;
  border-radius: var(--vd-r-sm);
  cursor: pointer;
}
.vd-tool:hover { background: var(--vd-bg-mute); color: var(--vd-fg); }
.vd-tool svg { color: var(--vd-fg-4); flex-shrink: 0; }

/* ===== Prev/Next ===== */
.vd-pn {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--vd-border);
  max-width: var(--vd-max);
}
.vd-pn-cell { min-height: 1px; }
.vd-pn-cell.next { text-align: right; }
.vd-pn-link {
  display: flex; flex-direction: column; gap: 4px;
  padding: 12px 16px;
  border: 1px solid var(--vd-border); border-radius: var(--vd-r);
  color: var(--vd-fg);
  transition: border-color 0.15s, background 0.15s;
}
.vd-pn-link:hover { background: var(--vd-bg-soft); border-color: var(--vd-fg-3); color: var(--vd-fg); }
.vd-pn-link.right { align-items: flex-end; }
.vd-pn-label { font-size: 11.5px; color: var(--vd-fg-4); display: inline-flex; align-items: center; gap: 4px; }
.vd-pn-title { font-size: 13.5px; font-weight: 600; color: var(--vd-fg); }

/* ===== Home ===== */
.vd-home { padding: 32px 0 60px; }
.vd-home-head { margin-bottom: 28px; padding-bottom: 0; border-bottom: 0; }
.vd-home-eyebrow {
  display: inline-block;
  font-size: 11px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 3px 10px; border: 1px solid var(--vd-border); border-radius: 999px;
  color: var(--vd-fg-3); background: var(--vd-bg);
  margin-bottom: 14px;
}
.vd-home-head h1 {
  font-size: 36px; line-height: 1.15; letter-spacing: -0.02em;
  font-weight: 700; margin: 0 0 12px;
}
.vd-home-sub {
  font-size: 16px; color: var(--vd-fg-3); margin: 0;
  max-width: 620px;
}

/* Quick reference cards */
.vd-quickref { margin: 24px 0 32px; }
.vd-qr-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
  border: 1px solid var(--vd-border); border-radius: var(--vd-r-lg);
  padding: 8px;
  background: var(--vd-bg);
}
@media (min-width: 700px) { .vd-qr-grid { grid-template-columns: repeat(3, 1fr); } }
.vd-qr-card {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  border-radius: var(--vd-r);
  color: var(--vd-fg);
  font-size: 13.5px; font-weight: 500;
  transition: background 0.15s;
}
.vd-qr-card:hover { background: var(--vd-bg-mute); color: var(--vd-fg); }
.vd-qr-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px;
  background: var(--vd-bg-mute);
  border-radius: var(--vd-r-sm);
  color: var(--vd-fg);
}
.vd-qr-text { flex: 1; }
.vd-qr-arr { color: var(--vd-fg-4); }
.vd-qr-card:hover .vd-qr-arr { color: var(--vd-fg); }

/* Blocks (6 categories on home) */
.vd-blocks {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px 36px;
  margin: 36px 0;
  padding-top: 28px;
  border-top: 1px solid var(--vd-border);
}
.vd-block { min-width: 0; }
.vd-block-head { margin-bottom: 12px; }
.vd-block-head h2 {
  font-size: 14px; font-weight: 600;
  margin: 0 0 4px;
  color: var(--vd-fg);
  letter-spacing: 0;
}
.vd-block-head p { font-size: 12.5px; color: var(--vd-fg-3); margin: 0; line-height: 1.55; }
.vd-block-list { list-style: none; padding: 0; margin: 12px 0 0; }
.vd-block-list li { line-height: 1.4; }
.vd-block-list a {
  display: block; padding: 4px 0;
  font-size: 13px; color: var(--vd-fg-2);
  border-left: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.vd-block-list a:hover { color: var(--vd-fg); }
.vd-block-more a { color: var(--vd-fg-4); font-size: 12px; }
.vd-block-more a:hover { color: var(--vd-fg); }

/* Latest list */
.vd-latest { margin: 36px 0; padding-top: 28px; border-top: 1px solid var(--vd-border); }
.vd-latest-list {
  margin-top: 16px;
  border: 1px solid var(--vd-border); border-radius: var(--vd-r-lg);
  background: var(--vd-bg); overflow: hidden;
}
.vd-latest-row {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--vd-border-soft);
  color: var(--vd-fg);
  transition: background 0.15s;
}
.vd-latest-row:last-child { border-bottom: 0; }
.vd-latest-row:hover { background: var(--vd-bg-soft); color: var(--vd-fg); }
.vd-latest-row h3 { font-size: 14px; font-weight: 600; margin: 0 0 3px; color: var(--vd-fg); }
.vd-latest-row p {
  font-size: 12.5px; color: var(--vd-fg-3); margin: 0;
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}
.vd-latest-meta { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.vd-latest-meta time { font-size: 11.5px; color: var(--vd-fg-4); font-variant-numeric: tabular-nums; }
.vd-tag {
  font-size: 10.5px; font-weight: 500;
  padding: 1px 6px; border-radius: 3px;
  background: var(--vd-bg-mute); color: var(--vd-fg-3);
  border: 1px solid var(--vd-border);
}

/* FAQ */
.vd-faq { margin: 36px 0 0; padding-top: 28px; border-top: 1px solid var(--vd-border); }
.vd-faq-list {
  margin-top: 16px;
  border: 1px solid var(--vd-border); border-radius: var(--vd-r-lg);
  background: var(--vd-bg); overflow: hidden;
}
.vd-faq-item { border-bottom: 1px solid var(--vd-border-soft); }
.vd-faq-item:last-child { border-bottom: 0; }
.vd-faq-item summary {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 18px;
  font-size: 13.5px; font-weight: 600;
  cursor: pointer; list-style: none;
  color: var(--vd-fg);
}
.vd-faq-item summary::-webkit-details-marker { display: none; }
.vd-faq-item summary::after {
  content: '+'; font-size: 16px; color: var(--vd-fg-3); font-weight: 400;
}
.vd-faq-item[open] summary::after { content: '−'; }
.vd-faq-ans { padding: 0 18px 14px; color: var(--vd-fg-2); font-size: 13.5px; line-height: 1.7; }

/* List page (topics/) */
.vd-list-page { padding-top: 28px; }
.vd-list {
  border: 1px solid var(--vd-border); border-radius: var(--vd-r-lg);
  background: var(--vd-bg); overflow: hidden;
  max-width: var(--vd-max);
}
.vd-list-row {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--vd-border-soft);
  color: var(--vd-fg);
  transition: background 0.15s;
}
.vd-list-row:last-child { border-bottom: 0; }
.vd-list-row:hover { background: var(--vd-bg-soft); color: var(--vd-fg); }
.vd-list-main { min-width: 0; }
.vd-list-row h3 { font-size: 14.5px; font-weight: 600; margin: 0 0 4px; color: var(--vd-fg); }
.vd-list-row p {
  font-size: 12.5px; color: var(--vd-fg-3); margin: 0 0 6px;
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}
.vd-list-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.vd-list-meta time { font-size: 11.5px; color: var(--vd-fg-4); }
.vd-list-arr { color: var(--vd-fg-4); flex-shrink: 0; }
.vd-list-row:hover .vd-list-arr { color: var(--vd-fg); }

/* Category index */
.vd-cat-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1px; background: var(--vd-border);
  border: 1px solid var(--vd-border); border-radius: var(--vd-r-lg); overflow: hidden;
  max-width: var(--vd-max);
}
.vd-cat-card {
  display: block; padding: 18px;
  background: var(--vd-bg); color: var(--vd-fg);
  transition: background 0.15s;
}
.vd-cat-card:hover { background: var(--vd-bg-soft); color: var(--vd-fg); }
.vd-cat-icon {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  background: var(--vd-bg-mute);
  border-radius: var(--vd-r-sm);
  margin-bottom: 10px;
}
.vd-cat-card h3 { font-size: 14px; font-weight: 600; margin: 0 0 4px; }
.vd-cat-card p { font-size: 12.5px; color: var(--vd-fg-3); margin: 0 0 8px; line-height: 1.5; min-height: 36px; }
.vd-cat-count { font-size: 11px; color: var(--vd-fg-4); }

/* Pagination */
.vd-pg {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 20px;
  max-width: var(--vd-max);
}
.vd-pg-prev, .vd-pg-next {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 5px 10px;
  border: 1px solid var(--vd-border); border-radius: var(--vd-r-sm);
  font-size: 12.5px; color: var(--vd-fg);
}
.vd-pg-prev:hover, .vd-pg-next:hover { background: var(--vd-bg-soft); color: var(--vd-fg); }
.vd-pg-prev.disabled, .vd-pg-next.disabled { color: var(--vd-fg-4); cursor: not-allowed; }
.vd-pg-nums { display: flex; gap: 2px; list-style: none; padding: 0; margin: 0; }
.vd-pg-nums li a {
  display: inline-block; min-width: 30px; text-align: center;
  padding: 4px 9px; font-size: 12.5px;
  color: var(--vd-fg-3); border-radius: var(--vd-r-sm);
}
.vd-pg-nums li a:hover { background: var(--vd-bg-soft); color: var(--vd-fg); }
.vd-pg-nums li.active a { background: var(--vd-fg); color: #fff; }

/* Steps (download page) */
.steps { list-style: none; counter-reset: vstep; padding: 0; margin: 16px 0; }
.steps > li {
  counter-increment: vstep; position: relative;
  padding: 12px 16px 12px 50px;
  border: 1px solid var(--vd-border); border-radius: var(--vd-r);
  margin-bottom: 10px;
  background: var(--vd-bg);
}
.steps > li::before {
  content: counter(vstep);
  position: absolute; left: 14px; top: 12px;
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  background: var(--vd-fg); color: #fff;
  border-radius: 50%;
  font-size: 12px; font-weight: 600;
  font-family: var(--vd-font-mono);
}

/* ===== Footer ===== */
.vf {
  border-top: 1px solid var(--vd-border);
  background: var(--vd-bg-soft);
  padding: 40px 24px 22px;
  margin-top: 40px;
}
.vf-inner { max-width: 1100px; margin: 0 auto; }
.vf-top { margin-bottom: 24px; }
.vf-brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 15px;
  color: var(--vd-fg);
}
.vf-tag { font-size: 12.5px; color: var(--vd-fg-3); margin: 6px 0 0; max-width: 480px; }
.vf-cols {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--vd-border);
}
.vf-col h5 { font-size: 11.5px; font-weight: 600; color: var(--vd-fg); margin: 0 0 10px; text-transform: uppercase; letter-spacing: 0.04em; }
.vf-col a {
  display: block;
  font-size: 12.5px; color: var(--vd-fg-3);
  padding: 3px 0;
}
.vf-col a:hover { color: var(--vd-fg); }
.vf-col a.active { color: var(--vd-fg); font-weight: 500; }
.vf-bottom { padding-top: 16px; }
.vf-risk { font-size: 11.5px; color: var(--vd-fg-4); margin: 0 0 6px; line-height: 1.55; }
.vf-copy { font-size: 11.5px; color: var(--vd-fg-4); margin: 0; }

/* ===== 404 ===== */
.vd-404 { min-height: 60vh; display: flex; align-items: center; justify-content: center; padding: 80px 24px; }
.vd-404-inner { text-align: center; max-width: 440px; }
.vd-404-code {
  font-family: var(--vd-font-mono); font-size: 96px; font-weight: 700;
  color: var(--vd-fg-4); line-height: 1; margin-bottom: 12px;
}
.vd-404 h1 { font-size: 24px; font-weight: 700; margin: 0 0 10px; }
.vd-404 p { color: var(--vd-fg-3); margin: 0 0 22px; }
.vd-404-actions { display: flex; gap: 8px; justify-content: center; }
.vd-btn {
  display: inline-flex; align-items: center; gap: 6px;
  height: 34px; padding: 0 16px;
  font-size: 13px; font-weight: 500;
  border-radius: var(--vd-r-sm);
}
.vd-btn.primary { background: var(--vd-fg); color: #fff; }
.vd-btn.primary:hover { background: var(--vd-fg-2); color: #fff; }
.vd-btn.ghost { background: transparent; border: 1px solid var(--vd-border); color: var(--vd-fg); }
.vd-btn.ghost:hover { background: var(--vd-bg-mute); color: var(--vd-fg); }

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .vd-shell { grid-template-columns: var(--vd-side) minmax(0, 1fr); gap: 28px; }
  .vd-toc { display: none; }
}
@media (max-width: 880px) {
  .vh-nav { display: none; }
  .vh-search { min-width: 140px; }
  .vh-search kbd { display: none; }
  .vh-langs a:nth-child(n+5) { display: none; }
}
@media (max-width: 768px) {
  .vd-shell { grid-template-columns: 1fr; }
  .vd-side {
    position: relative; top: 0; height: auto;
    border-bottom: 1px solid var(--vd-border); padding: 12px 0;
  }
  .vd-side-inner { padding-right: 0; }
  .vd-home-head h1 { font-size: 26px; }
  .vd-art-head h1 { font-size: 24px; }
  .vd-blocks { grid-template-columns: 1fr; gap: 24px; }
  .vd-latest-row, .vd-list-row { flex-direction: column; align-items: flex-start; gap: 6px; }
  .vd-pn { grid-template-columns: 1fr; }
}