/* ============ 主题变量（light / dark） ============ */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --surface-2: #f3f2ee;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --c1: #2a78d6;   /* 类别 / 社区 A */
  --c2: #eb6834;   /* 类别 / 社区 B */
  --c3: #1baf7a;   /* 类别 C */
  --accent: #4a3aa7; /* 当前正在计算的边 */
  --bad: #d03b3b;
  --good: #006300;
  --seq-1: #cde2fb; --seq-2: #9ec5f4; --seq-3: #6da7ec; --seq-4: #3987e5; --seq-5: #256abf; --seq-6: #184f95; --seq-7: #0d366b;
  --edge: #c3c2b7;
  --node-idle: #e1e0d9;
  --code-bg: #f0efec;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --surface-2: #232321;
    --ink: #ffffff; --ink-2: #c3c2b7; --muted: #898781;
    --grid: #2c2c2a; --axis: #383835; --border: rgba(255, 255, 255, 0.10);
    --c1: #3987e5; --c2: #d95926; --c3: #199e70; --accent: #9085e9;
    --bad: #e66767; --good: #0ca30c;
    --edge: #4a4a46; --node-idle: #383835; --code-bg: #262624;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --surface-2: #232321;
  --ink: #ffffff; --ink-2: #c3c2b7; --muted: #898781;
  --grid: #2c2c2a; --axis: #383835; --border: rgba(255, 255, 255, 0.10);
  --c1: #3987e5; --c2: #d95926; --c3: #199e70; --accent: #9085e9;
  --bad: #e66767; --good: #0ca30c;
  --edge: #4a4a46; --node-idle: #383835; --code-bg: #262624;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
}

/* ============ 布局 ============ */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 232px; flex: none;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--surface);
  padding: 20px 14px;
}
.brand { font-weight: 700; font-size: 17px; margin: 0 6px 4px; }
.brand-sub { color: var(--muted); font-size: 12px; margin: 0 6px 18px; }
.nav a {
  display: flex; gap: 8px; align-items: baseline;
  padding: 7px 10px; border-radius: 8px;
  color: var(--ink-2); text-decoration: none; font-size: 14px;
}
.nav a .no { color: var(--muted); font-variant-numeric: tabular-nums; font-size: 12px; width: 16px; }
.nav a:hover { background: var(--surface-2); color: var(--ink); }
.nav a.active { background: var(--surface-2); color: var(--ink); font-weight: 600; }
.nav .group-title { color: var(--muted); font-size: 12px; margin: 14px 10px 4px; }
.theme-btn {
  margin: 18px 6px 0; width: calc(100% - 12px);
  background: transparent; color: var(--ink-2);
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; cursor: pointer; font: inherit; font-size: 13px;
}
.theme-btn:hover { color: var(--ink); background: var(--surface-2); }

main { flex: 1; min-width: 0; padding: 32px 40px 80px; }
.section { display: none; max-width: 1160px; margin: 0 auto; }
.section.active { display: block; }
h1 { font-size: 28px; margin: 0 0 6px; line-height: 1.3; }
h2 { font-size: 20px; margin: 36px 0 10px; line-height: 1.4; }
h3 { font-size: 16px; margin: 20px 0 8px; }
.lead { color: var(--ink-2); font-size: 16px; margin: 0 0 20px; }
p { margin: 8px 0; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
code, .mono { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 0.92em; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
}
.grid-2 { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.stack > * + * { margin-top: 16px; }
@media (max-width: 1100px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 820px) {
  .layout { flex-direction: column; }
  .sidebar { position: static; width: 100%; height: auto; border-right: none; border-bottom: 1px solid var(--border); }
  .nav { display: flex; flex-wrap: wrap; gap: 2px; }
  .nav .group-title { display: none; }
  main { padding: 20px 16px 60px; }
}

.callout {
  border-left: 3px solid var(--accent);
  background: var(--surface);
  padding: 10px 14px; border-radius: 0 8px 8px 0; margin: 14px 0;
  color: var(--ink-2);
}
.callout b { color: var(--ink); }

.formula {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px 18px; margin: 12px 0; overflow-x: auto;
}
.formula .tex { font-size: 1.12em; }
.formula .legend-row { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 8px; font-size: 13px; color: var(--ink-2); }

/* ============ 控件 ============ */
.controls {
  display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center;
  padding: 12px 16px; margin-bottom: 14px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
}
.ctrl { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.ctrl .pname { font-family: ui-monospace, Consolas, monospace; font-size: 13px; color: var(--ink); }
.ctrl .val { font-variant-numeric: tabular-nums; min-width: 44px; color: var(--ink-2); font-size: 13px; }
.ctrl input[type="range"] { width: 130px; accent-color: var(--accent); }
.ctrl input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }
.ctrl select {
  font: inherit; font-size: 13px; padding: 3px 6px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--ink);
}
.ctrl.disabled { opacity: 0.45; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg button {
  font: inherit; font-size: 13px; border: none; background: transparent; color: var(--ink-2);
  padding: 4px 10px; cursor: pointer;
}
.seg button + button { border-left: 1px solid var(--border); }
.seg button.on { background: var(--accent); color: #fff; }
.btn {
  font: inherit; font-size: 13px; cursor: pointer;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface-2); color: var(--ink); padding: 5px 12px;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }

/* ============ 可视化 ============ */
.viz { width: 100%; height: auto; display: block; }
.viz text { font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
.panel-title { font-size: 13px; color: var(--muted); margin: 0 0 6px; display: flex; justify-content: space-between; gap: 10px; }
.panel-title b { color: var(--ink); font-weight: 600; }

.g-edge { stroke: var(--edge); stroke-width: 1.6; fill: none; transition: stroke-width .25s, stroke .25s, opacity .25s; }
.g-node circle.body { stroke: var(--surface); stroke-width: 2; cursor: pointer; transition: fill .3s, opacity .25s; }
.g-node circle.ring { fill: none; stroke: var(--ink); stroke-width: 2.5; opacity: 0; transition: opacity .2s; pointer-events: none; }
.g-node.selected circle.ring { opacity: 1; }
.g-node text.id { fill: #fff; font-size: 13px; font-weight: 700; text-anchor: middle; dominant-baseline: central; pointer-events: none; }
.g-node text.feat { fill: var(--ink-2); font-size: 11px; text-anchor: middle; pointer-events: none; font-variant-numeric: tabular-nums; }
.g-elabel { font-size: 11.5px; font-weight: 600; fill: var(--ink); text-anchor: middle; dominant-baseline: central;
  paint-order: stroke; stroke: var(--surface); stroke-width: 4px; stroke-linejoin: round; pointer-events: none; font-variant-numeric: tabular-nums; }
.g-hint { fill: var(--muted); font-size: 12px; }

.axis line, .axis path { stroke: var(--axis); }
.axis text { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.gridline { stroke: var(--grid); stroke-width: 1; }
.axis-title { fill: var(--muted); font-size: 12px; }

.tooltip {
  position: fixed; z-index: 100; pointer-events: none;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--border); border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,.12);
  padding: 8px 10px; font-size: 12.5px; line-height: 1.5; max-width: 300px;
  opacity: 0; transition: opacity .12s;
}
.tooltip.show { opacity: 1; }
.tooltip .t-title { font-weight: 600; margin-bottom: 2px; }
.tooltip .sw { display: inline-block; width: 10px; height: 3px; border-radius: 2px; vertical-align: middle; margin-right: 6px; }

.legend { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 12.5px; color: var(--ink-2); margin: 2px 0 6px; }
.legend .sw { display: inline-block; width: 14px; height: 3px; border-radius: 2px; vertical-align: middle; margin-right: 6px; }
.legend .dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; vertical-align: -1px; margin-right: 6px; }

/* ============ 计算明细表 ============ */
.calc { font-size: 13.5px; }
.calc table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.calc th { text-align: left; color: var(--muted); font-weight: 500; font-size: 12px; border-bottom: 1px solid var(--grid); padding: 4px 6px; }
.calc td { border-bottom: 1px solid var(--grid); padding: 5px 6px; white-space: nowrap; }
.calc tr.sum td { border-top: 2px solid var(--axis); border-bottom: none; font-weight: 600; }
.calc tr.dim td { color: var(--muted); }
.calc .tag { display: inline-block; font-size: 11px; padding: 0 6px; border-radius: 10px; background: var(--surface-2); color: var(--ink-2); margin-left: 4px; }
.calc .hl { color: var(--accent); font-weight: 700; }
.calc .res { margin-top: 10px; padding: 8px 10px; background: var(--surface-2); border-radius: 8px; }
.calc .res b { font-variant-numeric: tabular-nums; }
.nodechip { display: inline-flex; align-items: center; justify-content: center; width: 20px; height: 20px; border-radius: 50%; color: #fff; font-size: 11px; font-weight: 700; margin-right: 4px; }

/* ============ 超参数卡片 ============ */
.params { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 14px; margin-top: 10px; }
.param {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px;
  display: flex; flex-direction: column; gap: 6px;
}
.param .p-head { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.param .p-name { font-family: ui-monospace, Consolas, monospace; font-weight: 700; font-size: 15px; }
.param .p-def { font-family: ui-monospace, Consolas, monospace; font-size: 12px; color: var(--muted); }
.param .p-badge { margin-left: auto; font-size: 11px; padding: 1px 8px; border-radius: 10px; border: 1px solid var(--accent); color: var(--accent); white-space: nowrap; }
.param .p-where { font-size: 11.5px; color: var(--muted); }
.param .p-mean { color: var(--ink); }
.param .p-row { display: grid; grid-template-columns: 58px 1fr; gap: 6px; font-size: 13.5px; color: var(--ink-2); }
.param .p-row .k { color: var(--muted); font-size: 12px; padding-top: 2px; }

/* ============ 杂项 ============ */
.table-plain { width: 100%; border-collapse: collapse; font-size: 14px; }
.table-plain th, .table-plain td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--grid); vertical-align: top; }
.table-plain th { color: var(--muted); font-weight: 500; font-size: 13px; }
.table-scroll { overflow-x: auto; }
.pager { display: flex; justify-content: space-between; margin-top: 44px; padding-top: 18px; border-top: 1px solid var(--border); }
.pager a { color: var(--accent); text-decoration: none; font-size: 14px; }
.pager a:hover { text-decoration: underline; }
.stat-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 8px 12px; }
.stat .k { font-size: 12px; color: var(--muted); }
.stat .v { font-size: 20px; font-weight: 600; }
.steps { display: flex; gap: 8px; flex-wrap: wrap; margin: 6px 0 10px; }
.step { padding: 4px 12px; border-radius: 16px; border: 1px solid var(--border); font-size: 13px; color: var(--muted); }
.step.on { border-color: var(--accent); color: var(--ink); background: var(--surface-2); font-weight: 600; }
.bullet li { margin: 4px 0; }
.kbd-note { font-size: 12.5px; color: var(--muted); }
.flow { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 10px 0; }
.flow .box { padding: 8px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); font-size: 14px; }
.flow .arrow { color: var(--muted); }
.ok { color: var(--good); font-weight: 600; }
.no { color: var(--bad); font-weight: 600; }