:root {
  --page:        #0d0d0d;
  --surface:     #1a1a19;
  --surface-2:   #232322;
  --ink:         #ffffff;
  --ink-2:       #c3c2b7;
  --muted:       #898781;
  --hairline:    #2c2c2a;
  --border:      rgba(255,255,255,0.10);
  /* validated 12-slot categorical palette, dark mode, CVD-safe ordering */
  --c0:#c8626d; --c1:#007faa; --c2:#b37903; --c3:#009d9e;
  --c4:#ae5528; --c5:#4c88d3; --c6:#7e7400; --c7:#a54f83;
  --c8:#629742; --c9:#a36cbc; --c10:#00885e; --c11:#6b64ba;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--page);
  color: var(--ink);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
  min-height: 100vh;
}
header {
  padding: 22px 28px 10px;
  display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap;
}
header h1 { font-size: 21px; font-weight: 650; }
header .sub { color: var(--muted); font-size: 13px; }
.layout {
  display: grid;
  grid-template-columns: minmax(420px, 46%) 1fr;
  gap: 20px;
  padding: 10px 28px 40px;
  align-items: start;
}
@media (max-width: 980px) { .layout { grid-template-columns: 1fr; } }

.wheel-card, .panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.wheel-card { padding: 10px; position: sticky; top: 14px; }
svg { display: block; width: 100%; height: auto; }
svg text { pointer-events: none; }

.seg { cursor: pointer; transition: opacity .15s; }
.seg.dim { opacity: 0.25; }
.seg.active path { stroke: var(--ink); stroke-width: 2; }

.core-label { fill: var(--ink); font-weight: 650; }
.core-sub   { fill: var(--muted); }

.panel { padding: 26px 30px; min-height: 60vh; }
.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--ink-2); cursor: pointer; text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.chip {
  display: inline-block; width: 11px; height: 11px; border-radius: 3px;
  margin-right: 8px; vertical-align: baseline;
}
.panel h2 { font-size: 22px; margin-bottom: 4px; }
.panel h3 {
  font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--muted); margin: 22px 0 8px;
}
.panel p { color: var(--ink-2); margin-bottom: 10px; }
.panel p.lead { color: var(--ink); font-size: 16px; }
ul.plain { list-style: none; }
ul.plain li {
  padding: 7px 0; border-bottom: 1px solid var(--hairline);
  color: var(--ink-2);
}
ul.plain li:last-child { border-bottom: none; }
ul.plain li b { color: var(--ink); font-weight: 600; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; padding: 3px 12px; font-size: 13px; color: var(--ink-2);
}
.subgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 1220px) { .subgrid { grid-template-columns: 1fr; } }
.subcard {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px; cursor: pointer;
}
.subcard:hover { border-color: rgba(255,255,255,0.28); }
.subcard b { display: block; margin-bottom: 3px; }
.subcard span { color: var(--muted); font-size: 13px; }
.catgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 1220px) { .catgrid { grid-template-columns: 1fr; } }

.tooltip {
  position: fixed; pointer-events: none; z-index: 10;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 12px; font-size: 13px;
  max-width: 280px; display: none; box-shadow: 0 6px 24px rgba(0,0,0,.5);
}
.tooltip b { display: block; }
.tooltip span { color: var(--ink-2); }
.err { padding: 40px; color: var(--ink-2); }
.stats { font-size: 12px; color: var(--muted); text-align: center; padding: 6px 0 8px; }