:root {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-card: #1b222c;
  --border: #2d3643;
  --fg: #e6edf3;
  --fg-dim: #9aa7b4;
  --accent: #3fb950;
  --accent2: #58a6ff;
  --accent3: #d29922;
  --sidebar-w: 260px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--fg); font-family: var(--sans); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); font-size: .88em; background: var(--bg-soft); padding: 2px 6px; border-radius: 4px; color: var(--accent3); }

/* Layout */
.wiki-shell { display: flex; min-height: 100vh; }
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--sidebar-w);
  background: var(--bg-soft); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; z-index: 100; overflow-y: auto;
}
.content {
  margin-left: var(--sidebar-w); flex: 1; padding: 40px 48px 80px; max-width: 860px;
}
.mobile-bar { display: none; }

/* Sidebar */
.sidebar-head { display: flex; align-items: center; justify-content: space-between; padding: 18px 16px; border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; font-size: 1.05rem; display: flex; align-items: center; gap: 8px; color: var(--fg); text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.lang-btn { border: 1px solid var(--border); background: var(--bg); color: var(--fg-dim); border-radius: 16px; padding: 4px 10px; cursor: pointer; font-size: .78rem; font-family: var(--sans); }
.lang-btn:hover { border-color: var(--accent2); color: var(--fg); }

.sidebar-nav { flex: 1; padding: 12px 0; }
.nav-group { margin-bottom: 8px; }
.nav-group::before {
  content: attr(data-label); display: block; padding: 8px 16px 4px;
  font-size: .72rem; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--fg-dim);
}
.nav-item {
  display: block; padding: 7px 16px 7px 20px; color: var(--fg-dim); font-size: .9rem;
  border-left: 2px solid transparent; text-decoration: none; transition: .12s;
}
.nav-item:hover { color: var(--fg); background: rgba(88,166,255,.06); text-decoration: none; }
.nav-item.active { color: var(--accent2); border-left-color: var(--accent2); background: rgba(88,166,255,.08); font-weight: 600; }

.sidebar-foot { padding: 14px 16px; border-top: 1px solid var(--border); display: flex; gap: 14px; font-size: .85rem; }

/* Content */
/* Content pages — JS 用 inline display 控制；:target 作无 JS 回退 */
.page { display: none; }
.page.active,
.page:target { display: block; }

.page h1 { font-size: 2rem; letter-spacing: -.5px; margin-bottom: 12px; }
.page h2 { font-size: 1.25rem; margin: 28px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.page p, .page li { color: var(--fg-dim); margin-bottom: 12px; }
.page .lead { font-size: 1.08rem; color: var(--fg); line-height: 1.75; }

/* Feature grid */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin: 20px 0; }
.feat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 18px; }
.feat-icon { font-size: 1.5rem; margin-bottom: 8px; }
.feat-card h3 { font-size: .95rem; margin-bottom: 4px; }
.feat-card p { font-size: .85rem; margin: 0; }

/* Callouts */
.callout { border-radius: 8px; padding: 14px 18px; margin: 16px 0; font-size: .92rem; border: 1px solid var(--border); }
.callout strong { display: block; margin-bottom: 4px; color: var(--fg); }
.callout span { color: var(--fg-dim); }
.callout.info { border-left: 3px solid var(--accent2); background: rgba(88,166,255,.06); }
.callout.tip { border-left: 3px solid var(--accent); background: rgba(63,185,80,.06); }
.callout.warn { border-left: 3px solid var(--accent3); background: rgba(210,153,34,.06); }

/* Code */
.code-block {
  background: #0a0e14; border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 20px; overflow-x: auto; font-family: var(--mono); font-size: .84rem;
  line-height: 1.65; margin: 12px 0 20px; color: var(--fg-dim);
}
.code-block code { background: none; padding: 0; color: inherit; font-size: inherit; }

/* Tables */
.data-table { width: 100%; border-collapse: collapse; margin: 16px 0 24px; font-size: .9rem; }
.data-table th { text-align: left; padding: 10px 14px; background: var(--bg-soft); border: 1px solid var(--border); color: var(--fg); font-weight: 600; }
.data-table td { padding: 10px 14px; border: 1px solid var(--border); color: var(--fg-dim); vertical-align: top; }
.data-table tr:hover td { background: rgba(88,166,255,.04); }

/* Terminal preview */
.panel-demo { margin: 20px 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: #0a0e14; }
.term-preview {
  padding: 16px 20px; margin: 0; font-family: var(--mono); font-size: .78rem;
  line-height: 1.55; white-space: pre; overflow-x: auto; color: var(--fg-dim);
}
.term-preview .c-g { color: var(--accent); }
.term-preview .c-d { color: #484f58; }
.term-preview .bar-f { color: #fff; }
.term-preview .bar-e { color: #444c56; }

/* Flow diagram */
.flow-diagram { display: flex; align-items: center; gap: 10px; margin: 20px 0; flex-wrap: wrap; }
.flow-step { background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 10px 16px; font-size: .88rem; color: var(--fg); }
.flow-arrow { color: var(--accent2); font-size: 1.2rem; }

/* Lists */
.plain-list { padding-left: 20px; margin: 12px 0 20px; }
.plain-list li { margin-bottom: 6px; }
.steps { padding-left: 22px; margin: 12px 0 20px; }
.steps li { margin-bottom: 8px; color: var(--fg-dim); }

/* FAQ */
.faq-list { margin-top: 16px; }
.faq-item { border: 1px solid var(--border); border-radius: 8px; margin-bottom: 8px; background: var(--bg-card); }
.faq-item summary { padding: 14px 18px; cursor: pointer; font-weight: 600; color: var(--fg); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: "▸ "; color: var(--accent2); }
.faq-item[open] summary::before { content: "▾ "; }
.faq-item p { padding: 0 18px 14px; margin: 0; font-size: .9rem; }

/* Mobile */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); transition: transform .25s; }
  .sidebar.open { transform: translateX(0); box-shadow: 4px 0 24px rgba(0,0,0,.5); }
  .content { margin-left: 0; padding: 72px 20px 60px; }
  .mobile-bar {
    display: flex; align-items: center; gap: 12px;
    position: fixed; top: 0; left: 0; right: 0; height: 52px; z-index: 90;
    background: rgba(13,17,23,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border);
    padding: 0 16px;
  }
  .menu-btn { background: none; border: 1px solid var(--border); color: var(--fg); border-radius: 6px; padding: 4px 10px; cursor: pointer; font-size: 1.1rem; }
  .mobile-title { font-weight: 600; font-size: .95rem; flex: 1; }
  .lang-btn.sm { margin-left: auto; }
}