:root {
  --bg: #f7f7f5; --panel: #ffffff; --ink: #1b1d1f; --muted: #646a70; --line: #e3e4e1;
  --accent: #15803d; --accent-ink: #ffffff; --accent-soft: #e7f5ec; --warn: #b45309; --bad: #b91c1c;
  --chart: #15803d; --chart-fill: rgba(21, 128, 61, 0.10);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111314; --panel: #1a1d1f; --ink: #e9eaea; --muted: #9aa1a6; --line: #2b3033;
    --accent: #22c55e; --accent-ink: #06210f; --accent-soft: #143222; --warn: #f59e0b; --bad: #f87171;
    --chart: #4ade80; --chart-fill: rgba(74, 222, 128, 0.12);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111314; --panel: #1a1d1f; --ink: #e9eaea; --muted: #9aa1a6; --line: #2b3033;
  --accent: #22c55e; --accent-ink: #06210f; --accent-soft: #143222; --warn: #f59e0b; --bad: #f87171;
  --chart: #4ade80; --chart-fill: rgba(74, 222, 128, 0.12);
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.top { border-bottom: 1px solid var(--line); background: var(--panel); position: sticky; top: 0; z-index: 2; }
.top .wrap { display: flex; justify-content: space-between; align-items: center; height: 56px; }
.brand { font-weight: 650; display: flex; gap: 10px; align-items: center; }
.dot { width: 12px; height: 12px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.live { color: var(--muted); font-size: 14px; }
.intro h1 { font-size: clamp(26px, 4vw, 38px); line-height: 1.15; margin: 40px 0 12px; letter-spacing: -0.01em; }
.intro p { max-width: 760px; color: var(--muted); margin: 0 0 28px; }
.controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 20px; }
.controls label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 600; }
.hint { font-weight: 400; color: var(--muted); }
input, select { font: inherit; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); min-width: 0; }
input[type="range"] { padding: 0; accent-color: var(--accent); }
.btn { font: inherit; font-weight: 600; border: 0; border-radius: 8px; padding: 9px 16px; background: var(--accent); color: var(--accent-ink); cursor: pointer; white-space: nowrap; }
.btn:hover { filter: brightness(1.06); }
.btn:disabled { opacity: 0.45; cursor: default; filter: none; }
.btn.stop { background: var(--bad); color: #fff; }
.me { background: var(--accent-soft); border: 1px solid var(--accent); border-radius: 12px; padding: 16px; margin-bottom: 20px; }
.me-head { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.eyebrow { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.me-title { font-size: 20px; font-weight: 650; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; margin: 14px 0 8px; }
.stat { background: var(--panel); border-radius: 8px; padding: 8px 10px; border: 1px solid var(--line); }
.stat .k { font-size: 12px; color: var(--muted); }
.stat .v { font-size: 18px; font-weight: 650; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.log { font: 12px/1.5 var(--mono); color: var(--muted); max-height: 110px; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere; }
.runs { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 460px), 1fr)); gap: 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.card.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.card-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.card h3 { margin: 0; font-size: 18px; }
.sub { color: var(--muted); font-size: 14px; }
.nums { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }
.nums b { color: var(--ink); font-weight: 650; }
.chart { width: 100%; height: 70px; background: var(--bg); border-radius: 8px; }
.chart .line { fill: none; stroke: var(--chart); stroke-width: 2; vector-effect: non-scaling-stroke; }
.chart .area { fill: var(--chart-fill); }
.chart text { fill: var(--muted); font: 10px var(--mono); }
.sample { font: 13px/1.5 var(--mono); background: var(--bg); border-radius: 8px; padding: 8px 10px; white-space: pre-wrap; overflow-wrap: anywhere; max-height: 120px; overflow: auto; }
.sample .p { color: var(--muted); }
.sample:empty { display: none; }
.board summary { cursor: pointer; font-size: 14px; color: var(--muted); }
.board ol { margin: 8px 0 0; padding-left: 22px; font-size: 14px; font-variant-numeric: tabular-nums; }
.dl { font-size: 13px; color: var(--muted); }
.dl a { color: var(--accent); }
.how { margin: 40px 0 60px; color: var(--muted); max-width: 760px; }
.how h2 { color: var(--ink); font-size: 20px; }
.how li { margin-bottom: 8px; }
.how strong { color: var(--ink); }
code { font: 13px var(--mono); background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; overflow-wrap: anywhere; }
.fine { font-size: 14px; }
.err { color: var(--bad); }
@media (max-width: 520px) {
  .card-head, .me-head { flex-direction: column; align-items: stretch; }
}