/* ═══════════════════════════════════════════════════════════
   巴别塔 doc — 全站设计系统
   ═══════════════════════════════════════════════════════════ */

/* ── Design tokens ── */
:root {
  --bg: #0d0d0d;
  --bg-card: #161616;
  --bg-code: #1a1a1a;
  --bg-hover: #1e1e1e;
  --border: #2a2a2a;
  --border-subtle: #1f1f1f;
  --text: #e8e8e8;
  --text-secondary: #888;
  --text-muted: #555;
  --accent: #7c6af7;
  --accent-dim: rgba(124,106,247,.12);
  --accent-border: rgba(124,106,247,.3);
  --green: #3ecf8e;
  --green-dim: rgba(62,207,142,.1);
  --orange: #f59e0b;
  --orange-dim: rgba(245,158,11,.1);
  --red: #f56565;
  --red-dim: rgba(245,101,101,.1);
  --blue: #60a5fa;
  --blue-dim: rgba(96,165,250,.1);
  --syn-keyword: #c792ea;
  --syn-fn: #82aaff;
  --syn-str: #c3e88d;
  --syn-num: #f78c6c;
  --syn-comment: #546e7a;
  --syn-prop: #f07178;
  --syn-type: #ffcb6b;
  --syn-punc: #89ddff;
  --sidebar-w: 256px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */
.layout { display: flex; min-height: 100vh; }

/* ═══════════════════
   SIDEBAR
   ═══════════════════ */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  padding-bottom: 40px;
}

/* Logo */
.sidebar-logo {
  padding: 20px 20px 18px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}
.sidebar-logo a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.sidebar-logo a:hover { color: var(--accent); }
.sidebar-logo-badge {
  background: var(--accent);
  color: #fff;
  font-size: 9px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* Site nav */
.sidebar-nav { padding: 16px 0 0; flex-shrink: 0; }

.sidebar-section {
  padding: 8px 20px 4px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
  user-select: none;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 20px;
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .15s, background .15s, border-color .15s;
  line-height: 1.5;
}
.sidebar-link:hover {
  color: var(--text);
  background: var(--bg-hover);
}
.sidebar-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-dim);
  font-weight: 500;
}
.sidebar-link.sub {
  padding-left: 32px;
  font-size: 13px;
}
.sidebar-link.sub.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-dim);
}

/* TOC divider */
.sidebar-toc-divider {
  margin: 12px 20px;
  border: none;
  border-top: 1px solid var(--border-subtle);
}

/* On this page TOC (injected by toc.js) */
#page-toc { padding-bottom: 20px; }
#page-toc .toc-title {
  padding: 8px 20px 4px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
#page-toc a {
  display: block;
  padding: 4px 20px;
  color: var(--text-muted);
  font-size: 12px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .15s, border-color .15s, background .15s;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#page-toc a.h3 { padding-left: 30px; font-size: 11px; }
#page-toc a:hover { color: var(--text-secondary); }
#page-toc a.toc-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-dim);
}
#page-toc .toc-group {
  padding: 12px 20px 3px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0.65;
  user-select: none;
}

/* ═══════════════════
   MAIN
   ═══════════════════ */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 52px 72px 120px;
  max-width: calc(var(--sidebar-w) + 900px);
  min-width: 0;
}

/* ═══════════════════
   HERO
   ═══════════════════ */
.hero { margin-bottom: 52px; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.hero-eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.2;
  color: #fff;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}
.hero h1 .grad {
  background: linear-gradient(135deg, #fff 0%, #c4b5fd 55%, #7c6af7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.8;
  font-size: 15px;
}

.hero-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent-border);
  border-radius: 4px;
  padding: 3px 10px;
}

/* ═══════════════════
   SECTIONS
   ═══════════════════ */
.section { margin-bottom: 60px; }
.section-anchor { position: relative; top: -80px; visibility: hidden; }

h2 {
  font-size: 19px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}
h2 .num {
  width: 24px; height: 24px;
  border-radius: 6px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  color: var(--accent);
  font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin: 22px 0 10px;
}

p { color: var(--text-secondary); margin-bottom: 14px; line-height: 1.75; }

hr { border: none; border-top: 1px solid var(--border-subtle); margin: 28px 0; }

/* ═══════════════════
   CALLOUTS
   ═══════════════════ */
.callout {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 13px 16px;
  border-radius: 8px;
  margin: 16px 0;
  font-size: 13px;
  line-height: 1.7;
}
.callout-icon { flex-shrink: 0; margin-top: 1px; font-style: normal; }
.callout.info  { background: var(--blue-dim);   border: 1px solid rgba(96,165,250,.2);  color: #93c5fd; }
.callout.warn  { background: var(--orange-dim); border: 1px solid rgba(245,158,11,.2); color: #fcd34d; }
.callout.tip   { background: var(--green-dim);  border: 1px solid rgba(62,207,142,.2); color: #6ee7b7; }
.callout.error { background: var(--red-dim);    border: 1px solid rgba(245,101,101,.2);color: #fca5a5; }

/* ═══════════════════
   CODE BLOCKS
   ═══════════════════ */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin: 16px 0;
  font-size: 13px;
}
.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  background: rgba(255,255,255,.025);
  border-bottom: 1px solid var(--border);
}
.code-lang  { font-size: 10px; font-weight: 700; color: var(--text-muted); letter-spacing: .06em; text-transform: uppercase; }
.code-file  { font-size: 11px; color: var(--text-muted); font-family: monospace; }
.code-body  { padding: 18px 20px; overflow-x: auto; }
pre         { font-family: "SF Mono","Fira Code","Cascadia Code",Consolas,monospace; line-height: 1.75; }

/* Syntax tokens */
.kw  { color: var(--syn-keyword); }
.fn  { color: var(--syn-fn); }
.str { color: var(--syn-str); }
.num { color: var(--syn-num); }
.cm  { color: var(--syn-comment); font-style: italic; }
.tp  { color: var(--syn-type); }
.pr  { color: var(--syn-prop); }
.pn  { color: var(--syn-punc); }
.pl  { color: var(--text); }

/* Inline code */
:not(pre) > code {
  font-family: monospace;
  color: var(--syn-fn);
  background: rgba(130,170,255,.08);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 12px;
}

/* ═══════════════════
   TABLES
   ═══════════════════ */
.api-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.api-table th {
  text-align: left;
  padding: 10px 14px;
  background: var(--bg-code);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 11px;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.api-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
  color: var(--text-secondary);
}
.api-table tr:last-child td { border-bottom: none; }
.api-table tr:hover td { background: var(--bg-hover); }
.api-table code {
  font-family: monospace;
  color: var(--syn-fn);
  background: rgba(130,170,255,.08);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 12px;
}

.error-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.error-table th {
  text-align: left;
  padding: 10px 14px;
  background: var(--bg-code);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 11px;
  text-transform: uppercase;
}
.error-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: top;
}
.error-table td:first-child { color: var(--red); }
.error-table td:last-child  { color: var(--green); }
.error-table tr:last-child td { border-bottom: none; }

/* ═══════════════════
   ARCH FLOW
   ═══════════════════ */
.flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  padding: 20px;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 16px 0;
  overflow-x: auto;
}
.flow-node {
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  text-align: center;
  min-width: 120px;
}
.flow-node .node-title { font-size: 12px; font-weight: 600; color: var(--text); display: block; }
.flow-node .node-sub   { font-size: 10px; color: var(--text-muted); margin-top: 2px; font-family: monospace; display: block; }
.flow-node.accent { border-color: var(--accent-border); background: var(--accent-dim); }
.flow-node.accent .node-title { color: var(--accent); }
.flow-arrow { flex-shrink: 0; padding: 0 8px; color: var(--text-muted); font-size: 16px; user-select: none; }

/* ═══════════════════
   DIAGRAM
   ═══════════════════ */
.diagram-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 20px;
  overflow-x: auto;
  margin: 16px 0;
}
.diagram-wrap svg  { display: block; margin: 0 auto; max-width: 100%; }
.diagram-wrap img  { display: block; margin: 0 auto; max-width: 100%; height: auto; }

/* ═══════════════════
   SEQUENCE DIAGRAM
   ═══════════════════ */
.seq-actors {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  border-bottom: 2px solid var(--border);
}
.seq-actor {
  padding: 10px 8px;
  text-align: center;
  font-weight: 600;
  font-size: 12px;
  color: var(--text);
  background: var(--bg-code);
  border-right: 1px solid var(--border-subtle);
}
.seq-actor:last-child { border-right: none; }
.seq-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  min-height: 44px;
  border-bottom: 1px solid var(--border-subtle);
}
.seq-row.note-row {
  grid-template-columns: 1fr;
  background: rgba(245,158,11,.06);
  border-left: 3px solid var(--orange);
}
.seq-note  { padding: 8px 14px; color: #fcd34d; font-size: 11px; font-style: italic; }
.seq-cell  { padding: 10px 8px; font-size: 11px; color: var(--text-secondary); display: flex; align-items: center; justify-content: center; text-align: center; border-right: 1px dashed #222; }
.seq-cell:last-child { border-right: none; }
.seq-cell.active { color: var(--text); font-weight: 600; }
.seq-call  { background: rgba(130,170,255,.08); border: 1px solid rgba(130,170,255,.2); border-radius: 4px; padding: 3px 8px; font-family: monospace; font-size: 10.5px; color: var(--syn-fn); white-space: nowrap; }
.seq-call.green  { background: rgba(62,207,142,.08);  border-color: rgba(62,207,142,.2);  color: var(--green); }
.seq-call.orange { background: rgba(245,158,11,.08);  border-color: rgba(245,158,11,.2);  color: var(--orange); }
.seq-call.red    { background: rgba(245,101,101,.08); border-color: rgba(245,101,101,.2); color: var(--red); }
.seq-result      { font-size: 10px; color: var(--green); background: rgba(62,207,142,.08); border: 1px solid rgba(62,207,142,.2); border-radius: 3px; padding: 2px 6px; white-space: nowrap; }

/* ═══════════════════
   CARDS (index page)
   ═══════════════════ */
.doc-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 20px;
}
.doc-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 24px;
  text-decoration: none;
  color: inherit;
  transition: border-color .2s, transform .2s, box-shadow .2s;
  position: relative;
  overflow: hidden;
}
.doc-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity .2s;
}
.doc-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(124,106,247,.14);
}
.doc-card:hover::before { opacity: 1; }
.doc-card-icon { font-size: 28px; margin-bottom: 12px; display: block; }
.doc-card-title { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.doc-card-desc  { font-size: 12px; color: var(--text-muted); line-height: 1.6; }
.doc-card-arrow { position: absolute; bottom: 18px; right: 20px; color: var(--text-muted); font-size: 16px; transition: transform .2s, color .2s; }
.doc-card:hover .doc-card-arrow { transform: translateX(3px); color: var(--accent); }

/* ═══════════════════
   FOOTER
   ═══════════════════ */
.footer {
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* ═══════════════════
   SCROLLBAR
   ═══════════════════ */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #2a2a2a; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #3a3a3a; }

/* ═══════════════════
   MOBILE
   ═══════════════════ */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main { margin-left: 0; padding: 32px 20px 80px; }
  .hero h1 { font-size: 26px; }
  .doc-cards { grid-template-columns: 1fr; }
  .seq-actors, .seq-row { grid-template-columns: 1fr 1fr; }
}