:root {
  --bg: #0f1115;
  --surface: #171a21;
  --surface-2: #1e222b;
  --text: #eceef2;
  --muted: #9aa1ad;
  --line: #2a2f3a;
  --red: #e10600;
  --vector: #5b9bff;
  --graph: #ff8a3d;
  --hybrid: #b48cff;
  --ok: #3ecf8e;
  --bad: #ff5c5c;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15.5px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: #ff6b5e; }
code { font-family: var(--mono); font-size: .88em; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }
.wrap { max-width: 1140px; margin: 0 auto; padding: 0 22px; }
.muted { color: var(--muted); }

.hero { border-bottom: 1px solid var(--line); background: linear-gradient(160deg, #1a0d0d 0%, var(--bg) 55%); padding: 56px 0 40px; }
.kicker { color: var(--red); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; font-size: 13px; margin: 0 0 8px; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); margin: 0 0 12px; line-height: 1.1; }
.lede { font-size: 19px; max-width: 820px; margin: 0 0 22px; color: #d4d8df; }
.hero-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 18px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.stat .v { font-size: 28px; font-weight: 800; font-variant-numeric: tabular-nums; }
.stat .k { color: var(--muted); font-size: 13px; }
.links a { font-weight: 600; text-decoration: none; }

section { padding: 36px 0 8px; }
h2 { font-size: 24px; margin: 0 0 6px; }
.sub, .note { color: var(--muted); margin: 4px 0 16px; }
.setup { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; }
.card h3 { margin: 0 0 6px; font-size: 16px; display: flex; align-items: center; gap: 8px; }
.card p { margin: 0; color: #c9ced7; }
.dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.dot.vector { background: var(--vector); } .dot.graph { background: var(--graph); } .dot.hybrid { background: var(--hybrid); }

.chart svg { width: 100%; height: auto; display: block; }
.chart .axis { stroke: var(--line); }
.chart text { fill: var(--muted); font-size: 12px; }
.chart .label { fill: var(--text); font-size: 13px; font-weight: 600; }
.chart .val { fill: var(--text); font-size: 11px; font-weight: 700; }
.chart .ci { stroke: #e9ecf1; stroke-width: 1.5; }
.legend { display: flex; gap: 18px; color: var(--muted); font-size: 13px; margin: 8px 0 14px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }

table { border-collapse: collapse; width: 100%; font-size: 14px; margin-top: 10px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.filters { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
select { background: var(--surface-2); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; font: inherit; }
.explorer { display: grid; grid-template-columns: minmax(260px, 34%) 1fr; gap: 16px; }
.qlist { list-style: none; margin: 0; padding: 0; max-height: 640px; overflow: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.qlist li { padding: 10px 12px; border-bottom: 1px solid var(--line); cursor: pointer; font-size: 14px; }
.qlist li:hover { background: var(--surface-2); }
.qlist li.active { background: #2a1416; border-left: 3px solid var(--red); }
.qlist .marks { display: flex; gap: 4px; margin-top: 4px; }
.mark { font: 700 10px/16px var(--mono); padding: 0 5px; border-radius: 4px; }
.mark.ok { background: rgba(62, 207, 142, .15); color: var(--ok); }
.mark.bad { background: rgba(255, 92, 92, .15); color: var(--bad); }
.pill { display: inline-block; font-size: 11px; font-weight: 700; padding: 1px 8px; border-radius: 99px; background: var(--surface-2); color: var(--muted); }

.detail { min-height: 300px; }
.detail .q { font-size: 18px; font-weight: 700; margin: 0 0 4px; }
.detail .gold { margin: 0 0 14px; color: var(--muted); }
.detail .gold b { color: var(--text); }
.cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.col { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; border-top: 3px solid var(--line); }
.col.vector { border-top-color: var(--vector); } .col.graph { border-top-color: var(--graph); } .col.hybrid { border-top-color: var(--hybrid); }
.col h4 { margin: 0 0 8px; font-size: 14px; display: flex; justify-content: space-between; }
.answer { font-weight: 700; margin: 6px 0; }
.answer.ok { color: var(--ok); } .answer.bad { color: var(--bad); }
.steps { list-style: none; margin: 0; padding: 0; font-size: 13px; }
.steps li { padding: 6px 0; border-bottom: 1px dashed var(--line); }
.steps code { white-space: pre-wrap; word-break: break-word; }
.steps details summary { cursor: pointer; color: var(--muted); font-size: 12px; }
.steps pre { white-space: pre-wrap; word-break: break-word; font: 11.5px/1.45 var(--mono); color: #b8bec9; max-height: 220px; overflow: auto; margin: 4px 0 0; }
.meta { color: var(--muted); font-size: 12px; margin-top: 8px; }

.schema svg { width: 100%; max-width: 760px; height: auto; }
.schema .nodes rect { fill: var(--surface-2); stroke: var(--red); stroke-width: 1.5; }
.schema .nodes text { fill: var(--text); font: 600 14px system-ui; text-anchor: middle; }
.schema .edges line, .schema .edges path { stroke: #6b7280; stroke-width: 1.5; }
.schema .edges text { fill: var(--muted); font: 600 11px var(--mono); text-anchor: middle; }
.schema .arrowhead { fill: #6b7280; }
.method li { margin: 6px 0; color: #c9ced7; }
.foot { color: var(--muted); font-size: 13px; padding: 30px 22px 50px; }

@media (max-width: 860px) {
  .setup, .cols, .explorer { grid-template-columns: 1fr; }
  .qlist { max-height: 320px; }
}