:root {
  --sidebar-bg: #0f172a;
  --sidebar-text: #94a3b8;
  --sidebar-active: #ffffff;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --java: #f07d00;
  --java-soft: #fff4e6;
  --go: #00a8e8;
  --go-soft: #e8f7fd;
  --bg: #f6f7f9;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --danger: #b91c1c;
  --danger-soft: #fee2e2;
  --ok: #15803d;
  --ok-soft: #dcfce7;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
}
.app { display: flex; min-height: 100vh; }

/* ===== 侧边栏 ===== */
.sidebar {
  position: fixed; inset: 0 auto 0 0; width: 288px;
  background: var(--sidebar-bg); color: var(--sidebar-text);
  overflow-y: auto; padding: 22px 14px 40px; z-index: 50;
  transition: transform .25s ease;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 0 8px 16px; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 10px; flex: none;
  background: linear-gradient(135deg, #f07d00, #00a8e8);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 15px;
}
.brand .titles b { display: block; color: #f1f5f9; font-size: 13.5px; line-height: 1.35; }
.brand .titles span { font-size: 11px; color: #64748b; }
.nav-group { margin: 12px 0 6px; padding: 0 10px; font-size: 11px; font-weight: 700; letter-spacing: 1.5px; color: #475569; text-transform: uppercase; }
nav a {
  display: block; padding: 5px 10px; margin: 1px 0;
  border-radius: 6px; color: var(--sidebar-text);
  text-decoration: none; font-size: 13px; line-height: 1.45;
  border-left: 2px solid transparent;
}
nav a:hover { color: #e2e8f0; background: #1e293b; }
nav a.active { color: var(--sidebar-active); background: rgba(37, 99, 235, .18); border-left-color: var(--accent); }
.sidebar-foot { margin-top: 26px; padding: 0 10px; font-size: 11px; color: #475569; }

/* ===== 主内容 ===== */
.content { margin-left: 288px; flex: 1; min-width: 0; padding: 30px 42px 80px; max-width: 1180px; }
.crumbs { font-size: 12.5px; color: var(--muted); margin-bottom: 12px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.page-header { margin-bottom: 22px; }
.page-header h1 { margin: 0 0 8px; font-size: 26px; line-height: 1.35; }
.page-header .summary { color: var(--muted); font-size: 14.5px; max-width: 860px; margin: 0; }
.tags { margin-top: 10px; }
.tag {
  display: inline-block; font-size: 11.5px; background: #eef2f7;
  border: 1px solid var(--border); color: #475569;
  padding: 2px 9px; border-radius: 99px; margin: 0 6px 4px 0;
}
h2 { font-size: 20px; margin: 36px 0 12px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
h3 { font-size: 16.5px; margin: 26px 0 10px; }
h4 { font-size: 14.5px; margin: 18px 0 8px; }
p { margin: 8px 0; }
ul, ol { margin: 8px 0; padding-left: 22px; }
li { margin: 4px 0; }
section { scroll-margin-top: 20px; }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 22px; box-shadow: var(--shadow);
  overflow-x: auto; margin: 12px 0;
}
table { width: 100%; border-collapse: collapse; font-size: 13.5px; background: var(--card); margin: 10px 0; }
th, td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; vertical-align: top; }
th { background: #f1f5f9; font-weight: 600; white-space: nowrap; }
tr:nth-child(even) td { background: #fafbfc; }
code {
  background: #f1f5f9; border: 1px solid var(--border);
  padding: 1px 6px; border-radius: 5px; font-size: 12.5px;
  font-family: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
pre {
  background: #0f172a; color: #e2e8f0; border-radius: 10px;
  padding: 14px 18px; overflow-x: auto; font-size: 13px; line-height: 1.6;
}
pre code { background: transparent; border: none; color: inherit; padding: 0; }

.badge {
  display: inline-block; font-size: 11.5px; font-weight: 600;
  padding: 2px 9px; border-radius: 99px; vertical-align: middle; margin: 0 2px;
}
.badge.java { background: var(--java-soft); color: #c2410c; border: 1px solid #fed7aa; }
.badge.go { background: var(--go-soft); color: #0369a1; border: 1px solid #bae6fd; }
.badge.p0 { background: var(--danger-soft); color: var(--danger); }
.badge.p1 { background: var(--warn-soft); color: var(--warn); }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.plain { background: #eef2f7; color: #475569; border: 1px solid var(--border); }

.callout {
  border-left: 4px solid var(--accent); background: var(--accent-soft);
  border-radius: 0 10px 10px 0; padding: 11px 16px; margin: 14px 0; font-size: 14px;
}
.callout.warn { border-color: var(--warn); background: var(--warn-soft); }
.callout.danger { border-color: var(--danger); background: var(--danger-soft); }
.callout.ok { border-color: var(--ok); background: var(--ok-soft); }

.reference-figure {
  margin: 14px 0 20px; padding: 12px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.reference-figure a { display: block; line-height: 0; }
.reference-figure img {
  display: block; width: 100%; height: auto; max-height: 820px;
  object-fit: contain; object-position: top; border-radius: 8px;
  background: #fff;
}
.reference-figure figcaption { margin: 10px 4px 1px; color: var(--muted); font-size: 12.5px; line-height: 1.55; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 980px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

details.svc {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; margin: 8px 0; overflow: hidden;
}
details.svc summary {
  cursor: pointer; padding: 11px 16px; list-style: none;
  display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 14px;
}
details.svc summary::-webkit-details-marker { display: none; }
details.svc summary::after { content: "▾"; margin-left: auto; color: var(--muted); }
details.svc[open] summary::after { transform: rotate(180deg); }
details.svc .body { padding: 2px 18px 14px; border-top: 1px solid var(--border); font-size: 13.8px; }

.kv { display: grid; grid-template-columns: 96px 1fr; gap: 4px 12px; font-size: 13.5px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }

.flow-steps { counter-reset: step; list-style: none; padding: 0; margin: 0; }
.flow-steps li { position: relative; padding: 0 0 16px 40px; font-size: 14px; }
.flow-steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0; width: 26px; height: 26px;
  background: var(--accent); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 12.5px;
}
.flow-steps li:not(:last-child)::after {
  content: ""; position: absolute; left: 12px; top: 28px; bottom: 2px; width: 2px; background: var(--border);
}

dl.glossary { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 0; }
@media (max-width: 980px) { dl.glossary { grid-template-columns: 1fr; } }
dl.glossary div { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; }
dl.glossary dt { font-weight: 700; font-size: 14px; }
dl.glossary dd { margin: 4px 0 0; font-size: 13px; color: var(--muted); }

.arch { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; overflow-x: auto; }
.arch .row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; align-items: stretch; }
.arch .layer { text-align: center; font-size: 12px; font-weight: 700; color: var(--muted); letter-spacing: 2px; margin: 12px 0 8px; }
.arch .node {
  background: #f1f5f9; border: 1px solid var(--border); border-radius: 9px;
  padding: 7px 13px; font-size: 12.5px; text-align: center; min-width: 88px;
}
.arch .node.java { background: var(--java-soft); border-color: #fed7aa; }
.arch .node.go { background: var(--go-soft); border-color: #bae6fd; }
.arch .node.mid { background: #eef2ff; border-color: #c7d2fe; }
.arch .node.end { background: #f0fdf4; border-color: #bbf7d0; }
.arch .flow { text-align: center; color: var(--accent); font-size: 17px; line-height: 1; padding: 2px 0; }
.arch .pane { flex: 1 1 46%; min-width: 300px; border: 1px dashed var(--border); border-radius: 10px; padding: 10px 10px 12px; }
.arch .pane .pane-title { text-align: center; font-size: 13px; font-weight: 700; margin-bottom: 8px; }
.arch .pane.go { border-color: #7dd3fc; background: #f8fcff; }
.arch .pane.java { border-color: #fdba74; background: #fffbf5; }
.arch .pane .node { font-size: 11.5px; min-width: 74px; padding: 5px 7px; }

.toc-inline {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 18px; margin: 14px 0; font-size: 13.5px;
}
.toc-inline b { font-size: 13px; }
.toc-inline ul { margin: 6px 0 0; }

.checklist { list-style: none; padding: 0; margin: 0; }
.checklist li {
  display: flex; align-items: flex-start; gap: 10px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 11px 15px; margin: 8px 0;
  font-size: 14px; cursor: pointer;
}
.checklist li input { margin-top: 4px; accent-color: var(--accent); width: 16px; height: 16px; }
.checklist li.done { background: var(--ok-soft); border-color: #86efac; color: var(--ok); }
.checklist li.done .txt { text-decoration: line-through; }
.progress { background: #e2e8f0; border-radius: 99px; height: 8px; overflow: hidden; margin: 12px 0 4px; }
.progress > i { display: block; height: 100%; background: var(--ok); width: 0; transition: width .3s; }
.progress-label { font-size: 12px; color: var(--muted); }

.pager { display: flex; gap: 12px; margin-top: 44px; }
.pager a {
  flex: 1; background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 16px; text-decoration: none; color: var(--text);
  font-size: 13px;
}
.pager a:hover { border-color: var(--accent); background: var(--accent-soft); }
.pager a .dir { display: block; font-size: 11px; color: var(--muted); }
.pager a .ttl { font-weight: 600; }
.pager a.next { text-align: right; }

.hero {
  background: linear-gradient(120deg, #0f172a 0%, #1e3a8a 55%, #0c4a6e 100%);
  color: #fff; border-radius: 16px; padding: 34px 38px; margin-bottom: 30px;
  box-shadow: var(--shadow);
}
.hero h1 { margin: 0 0 10px; font-size: 27px; }
.hero p { margin: 0; color: #cbd5e1; max-width: 760px; }
.hero .meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.hero .meta span { font-size: 12px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.2); padding: 3px 10px; border-radius: 99px; }

.cat-card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; }
.cat-card h3 { margin: 0 0 6px; font-size: 16px; }
.cat-card p { color: var(--muted); font-size: 13px; margin: 0 0 10px; }
.cat-card ul { margin: 0; padding-left: 18px; font-size: 13.5px; }
.cat-card li { margin: 3px 0; }
.cat-card a { color: var(--accent); text-decoration: none; }
.cat-card a:hover { text-decoration: underline; }

#home-search { width: 100%; max-width: 560px; padding: 12px 16px; font-size: 14px; border-radius: 10px; border: 1px solid var(--border); }
#home-results { margin-top: 14px; }
#home-results .hit { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; margin: 6px 0; }
#home-results .hit a { color: var(--accent); font-weight: 600; text-decoration: none; font-size: 14px; }
#home-results .hit .cat { font-size: 11.5px; color: var(--muted); }
#home-results .hit p { margin: 2px 0 0; font-size: 13px; color: var(--muted); }

#back-to-top {
  position: fixed; right: 24px; bottom: 24px; width: 44px; height: 44px;
  border-radius: 50%; border: none; background: var(--sidebar-bg); color: #fff;
  font-size: 18px; cursor: pointer; box-shadow: 0 4px 14px rgba(15,23,42,.35);
  opacity: 0; pointer-events: none; transition: opacity .25s; z-index: 60;
}
#back-to-top.show { opacity: 1; pointer-events: auto; }
#sidebar-toggle {
  display: none; position: fixed; top: 14px; left: 14px; z-index: 70;
  width: 42px; height: 42px; border-radius: 10px; border: none;
  background: var(--sidebar-bg); color: #fff; font-size: 18px; cursor: pointer;
}
.footer { margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--border); color: var(--muted); font-size: 12.5px; }

@media (max-width: 920px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: 0 0 0 100vmax rgba(15,23,42,.5); }
  .content { margin-left: 0; padding: 72px 18px 60px; }
  #sidebar-toggle { display: block; }
  .hero { padding: 24px 20px; }
  .hero h1 { font-size: 21px; }
}
@media print {
  .sidebar, #back-to-top, #sidebar-toggle, .pager { display: none !important; }
  .content { margin-left: 0; padding: 0; max-width: none; }
  body { background: #fff; }
  .card, table, dl.glossary div, details.svc, .reference-figure { box-shadow: none; break-inside: avoid; }
  a { color: inherit; text-decoration: none; }
}