:root {
  --bg: #F5F5F7; --card: #FFFFFF; --text: #1D1D1F; --muted: #6E6E73;
  --link: #0066CC; --accent: #0A84FF; --border: rgba(0,0,0,.08);
  --hsan: #0A84FF; --bcm: #30D158;
  --radius: 14px; --sidebar-w: 260px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1C1C1E; --card: #2C2C2E; --text: #F5F5F7; --muted: #98989D;
    --link: #0A84FF; --border: rgba(255,255,255,.1);
  }
}
:root[data-theme="dark"] {
  --bg: #1C1C1E; --card: #2C2C2E; --text: #F5F5F7; --muted: #98989D;
  --link: #0A84FF; --border: rgba(255,255,255,.1);
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.75 system-ui, -apple-system, "SF Pro Text", "Segoe UI", Roboto,
        "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
code, pre { font-family: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace; font-size: .88em; }
a { color: var(--link); text-decoration: none; }
.muted { color: var(--muted); }
.error { color: #FF3B30; }

.shell { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-w); flex-shrink: 0; background: var(--card);
  border-right: 1px solid var(--border); display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh; overflow-y: auto; padding: 16px;
}
.brand { font-weight: 700; color: var(--text); }
.searchbox input {
  width: 100%; margin: 12px 0; padding: 8px 12px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
.seg { display: flex; background: var(--bg); border-radius: 10px; padding: 3px; }
.seg-item { flex: 1; text-align: center; padding: 5px 0; border-radius: 8px; color: var(--muted); font-size: 14px; }
.seg-item.active { background: var(--card); color: var(--text); box-shadow: 0 1px 3px rgba(0,0,0,.12); }
.quick-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; margin-top: 10px; }
.quick-links a { border: 1px solid var(--border); border-radius: 8px; padding: 5px 8px; color: var(--text); font-size: 13px; text-align: center; }
.sidebar-tree { flex: 1; margin-top: 12px; font-size: 14px; }
.sidebar-tree summary { cursor: pointer; color: var(--muted); padding: 6px 0; }
.sidebar-tree ul { list-style: none; margin: 0; padding: 0 0 0 8px; }
.sidebar-tree a { display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: 8px; color: var(--text); }
.sidebar-tree a.active { background: var(--bg); border-left: 3px solid var(--accent); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); flex-shrink: 0; }
.dot.st-已学习 { background: #30D158; }
.dot.st-深度学习 { background: #0A84FF; }
.count { color: var(--muted); font-size: 12px; }
.sidebar-foot { display: flex; gap: 8px; padding-top: 12px; }
.sidebar-foot button { border: 1px solid var(--border); background: var(--bg); color: var(--text); border-radius: 8px; padding: 6px 12px; cursor: pointer; }

.content { flex: 1; min-width: 0; padding: 32px 24px; }
.content > * { max-width: 880px; margin-left: auto; margin-right: auto; }
.doc-layout { display: grid; grid-template-columns: minmax(0, 70ch) 220px; gap: 28px; align-items: start; max-width: 1120px; }
.doc-body { max-width: 70ch; }
.doc-body table, .doc-body pre { max-width: 880px; }
.doc-body table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; border-collapse: collapse; }
.doc-body th, .doc-body td { border: 1px solid var(--border); padding: 6px 10px; }
.doc-body img { max-width: 100%; cursor: zoom-in; }
.doc-body pre { background: var(--card); border-radius: 10px; padding: 14px; overflow-x: auto; }
.doc-body .highlight { background: var(--card); border-radius: 10px; overflow-x: auto; }
.doc-body .highlight pre { margin: 0; background: transparent; }
.doc-toc { position: sticky; top: 24px; order: 2; font-size: 14px; color: var(--muted); border-left: 1px solid var(--border); padding-left: 16px; }
.doc-toc ol { list-style: none; margin: 8px 0 0; padding: 0; }
.doc-toc li { margin: 4px 0; }
.doc-toc .toc-l3 { padding-left: 12px; }
.doc-tools { margin: 4px auto 14px; font-size: 13px; }
.doc-loader { display: flex; gap: 12px; align-items: center; max-width: 70ch; }
.doc-loader button { border: 1px solid var(--border); border-radius: 8px; background: var(--card); color: var(--text); padding: 6px 12px; cursor: pointer; }
.prevnext { display: flex; justify-content: space-between; margin: 24px auto; max-width: 70ch; }
.prevnext .next { margin-left: auto; }
.feedback { max-width: 70ch; margin: 20px auto; }
.feedback textarea { width: 100%; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--text); padding: 8px; }
.feedback button { margin-top: 8px; border: 0; border-radius: 8px; background: var(--accent); color: #fff; padding: 6px 14px; cursor: pointer; }
h1 { font-size: 34px; font-weight: 700; letter-spacing: -.02em; }
.viewer-title { max-width: none; }

.card {
  background: var(--card); border-radius: var(--radius); padding: 18px 20px;
  border: 1px solid var(--border); transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,.08); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; padding: 0; list-style: none; }
.pill { display: inline-block; font-size: 12px; padding: 2px 10px; border-radius: 999px; background: var(--bg); color: var(--muted); border: 1px solid var(--border); }
.pill.platform-hsan { color: var(--hsan); }
.pill.platform-bcm { color: var(--bcm); }
.breadcrumbs { font-size: 14px; color: var(--muted); margin-bottom: 8px; }
mark { background: rgba(10,132,255,.25); color: inherit; border-radius: 3px; }
.hero-search input { font-size: 18px; padding: 14px 18px; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin: 18px 0; overflow-x: auto; }
.tabs a { padding: 8px 14px; border-radius: 8px 8px 0 0; color: var(--muted); white-space: nowrap; }
.tabs a.active { color: var(--text); border-bottom: 2px solid var(--accent); }

select {
  border: 1px solid var(--border); border-radius: 8px; background: var(--bg);
  color: var(--text); padding: 7px 10px; max-width: 100%;
}
.graph-controls { max-width: 1120px; }
.graph-controls button, .viewer-toolbar button {
  border: 1px solid var(--border); border-radius: 8px; background: var(--card);
  color: var(--text); padding: 6px 12px; cursor: pointer;
}
.graph-mode input { position: absolute; opacity: 0; pointer-events: none; }
.graph-selects { display: flex; gap: 12px; flex-wrap: wrap; margin: 14px 0; }
.graph-selects label { display: grid; gap: 4px; min-width: min(300px, 100%); color: var(--muted); font-size: 14px; }
.graph-kind-filter { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.graph-workbench {
  max-width: 1120px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px; min-height: 620px;
}
.graph-toolbar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding-bottom: 10px; border-bottom: 1px solid var(--border);
}
.graph-stage {
  display: grid; grid-template-columns: minmax(0, 1fr) 280px;
  gap: 12px; height: 560px; padding-top: 12px;
}
.graph-cy {
  position: relative; min-height: 460px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--bg); overflow: hidden;
}
.graph-cy.hide-labels text { display: none; }
.graph-cy svg { display: block; width: 100%; height: 100%; min-height: 520px; }
.graph-svg-edge {
  stroke: var(--muted); stroke-width: 1.5; stroke-opacity: .55;
}
.graph-svg-edge.kind-mapping { stroke: var(--accent); stroke-dasharray: 8 6; }
.graph-svg-node { cursor: pointer; outline: none; }
.graph-svg-node circle {
  fill: var(--muted); stroke: var(--card); stroke-width: 4;
}
.graph-svg-node.platform-hsan circle { fill: var(--hsan); }
.graph-svg-node.platform-bcm circle { fill: var(--bcm); }
.graph-svg-node text {
  fill: var(--text); font-size: 12px; text-anchor: middle;
  paint-order: stroke; stroke: var(--bg); stroke-width: 4px; stroke-linejoin: round;
}
.graph-detail {
  min-width: 0; border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); padding: 14px; overflow: auto;
}
.graph-detail h2 {
  margin: 0 0 10px; font-size: 20px; line-height: 1.25; overflow-wrap: anywhere;
}
.graph-detail h3 { margin: 18px 0 8px; font-size: 15px; }
.graph-detail-meta {
  display: grid; grid-template-columns: 64px minmax(0, 1fr);
  gap: 6px 10px; margin: 0 0 12px; font-size: 13px;
}
.graph-detail-meta dt { color: var(--muted); }
.graph-detail-meta dd { margin: 0; overflow-wrap: anywhere; }
.graph-detail-edges {
  list-style: none; margin: 0; padding: 0; display: grid; gap: 6px;
  color: var(--muted); font-size: 13px;
}
.graph-mobile-list {
  display: grid; grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  gap: 14px; max-width: 1120px; min-height: 360px;
}
.graph-node-column, .graph-edge-column {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; overflow: auto;
}
.graph-node-column { display: grid; gap: 10px; align-content: start; }
.graph-node {
  display: block; border: 1px solid var(--border); border-left: 4px solid var(--muted);
  border-radius: 8px; padding: 8px 10px; color: var(--text); background: var(--bg);
}
.graph-node.platform-hsan { border-left-color: var(--hsan); }
.graph-node.platform-bcm { border-left-color: var(--bcm); }
.graph-node span { display: block; color: var(--muted); font-size: 12px; }
.graph-node strong { display: block; overflow-wrap: anywhere; }
.graph-edge-column { display: grid; gap: 8px; align-content: start; }
.graph-edge {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 8px; align-items: center; font-size: 13px;
}
.graph-edge code { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.quality-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px; max-width: 1120px;
}
.quality-card {
  display: grid; gap: 4px; background: var(--card); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 14px;
}
.quality-card.active { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.quality-card span { font-size: 26px; font-weight: 700; line-height: 1.1; }
.quality-card small { color: var(--muted); line-height: 1.35; }
.quality-kind-filter { display: flex; gap: 8px; flex-wrap: wrap; }
.viewer-shell { max-width: none; min-height: calc(100vh - 120px); }
.viewer-toolbar {
  display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 12px;
}
.viewer-zoom-custom {
  display: inline-flex; align-items: center; gap: 4px; color: var(--muted);
  border: 1px solid var(--border); border-radius: 8px; padding: 3px 8px;
  background: var(--card); font-size: 13px;
}
.viewer-zoom-custom input {
  width: 64px; border: 0; border-left: 1px solid var(--border);
  border-right: 1px solid var(--border); background: transparent; color: var(--text);
  padding: 3px 6px; font: inherit;
}
.viewer-grid {
  display: grid; grid-template-columns: minmax(260px, 34%) minmax(0, 1fr);
  gap: 12px; height: 78vh;
}
.viewer-source {
  display: none; height: 100%; margin: 0; border: 1px solid var(--border);
  background: var(--card); border-radius: 8px; padding: 12px; overflow: auto;
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.viewer-shell.split .viewer-source { display: block; }
.viewer-shell:not(.split) .viewer-grid { grid-template-columns: minmax(0, 1fr); }
.viewer-frame-wrap {
  position: relative; height: 100%; overflow: auto; border: 1px solid var(--border);
  border-radius: 8px; background: var(--card);
}
.viewer-frame-wrap iframe {
  width: 100%; height: 100%; border: 0; background: var(--card);
  transform-origin: 0 0;
}
.viewer-minimap {
  position: sticky; left: calc(100% - 126px); bottom: 12px;
  width: 110px; height: 72px; margin: -84px 12px 12px auto;
  border: 1px solid var(--border); border-radius: 6px;
  background: color-mix(in srgb, var(--card) 84%, transparent);
  pointer-events: none; overflow: hidden;
}
.viewer-minimap div {
  position: relative;
  min-width: 18px; min-height: 18px; border: 2px solid var(--accent);
  background: rgba(10,132,255,.14); border-radius: 4px;
}
.viewer-shell.fullscreen {
  position: fixed; inset: 0; z-index: 50; background: var(--bg);
  padding: 16px; min-height: 100vh;
}
.viewer-shell.fullscreen .viewer-grid { height: calc(100vh - 70px); }

.login-body { display: grid; place-items: center; min-height: 100vh; }
.login-card { background: var(--card); border-radius: 18px; padding: 36px; width: min(380px, 92vw); border: 1px solid var(--border); }
.login-card label { display: block; margin: 12px 0; font-size: 14px; color: var(--muted); }
.login-card input:not([type=checkbox]) { width: 100%; padding: 10px 12px; margin-top: 4px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 16px; }
.login-card button { width: 100%; margin-top: 16px; padding: 11px; border: 0; border-radius: 10px; background: var(--accent); color: #fff; font-size: 16px; cursor: pointer; }

.sidebar-open { display: none; }
@media (max-width: 1023px) {
  .sidebar { position: fixed; left: 0; z-index: 20; transform: translateX(-100%); transition: transform .25s ease; }
  .sidebar.open { transform: none; box-shadow: 0 0 40px rgba(0,0,0,.3); }
  .sidebar-open { display: block; position: fixed; top: 12px; left: 12px; z-index: 10;
    border: 1px solid var(--border); background: var(--card); color: var(--text);
    border-radius: 10px; padding: 6px 10px; }
  .content { padding: 56px 16px calc(16px + env(safe-area-inset-bottom)); }
  .doc-layout { display: block; }
  .doc-toc { position: static; border-left: 0; padding-left: 0; margin-bottom: 16px; }
  .graph-workbench { display: none; }
  .graph-mobile-list { display: grid; grid-template-columns: 1fr; }
  .graph-list { display: grid; }
  .viewer-grid { display: block; height: auto; }
  .viewer-source { height: 32vh; margin-bottom: 12px; }
  .viewer-frame-wrap { height: 62vh; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}