:root {
  --bg: #f6f6f1;
  --surface: #ffffff;
  --surface-2: #ecece4;
  --line: #d9d9cf;
  --ink: #14161a;
  --mute: #565d6b;
  --accent: #b6ff3c;
  --accent-ink: #152000;
  --link: #2a5d00;
  --series-accel: #1f6feb;
  --series-control: #c2410c;
  --good: #1a7f37;
  --warn: #8a5a00;
  --bad: #b3261e;
  --radius: 10px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "Segoe UI Mono", Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0e12;
    --surface: #14171d;
    --surface-2: #1c2029;
    --line: #2a303c;
    --ink: #eceef2;
    --mute: #9aa3b2;
    --link: #b6ff3c;
    --series-accel: #4f8ff7;
    --series-control: #e0703a;
    --good: #3fb950;
    --warn: #d29922;
    --bad: #f47067;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.6 var(--sans); }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
img, svg, iframe { max-width: 100%; }
:focus-visible { outline: 3px solid var(--series-accel); outline-offset: 2px; border-radius: 4px; }
.wrap { max-width: 1140px; margin: 0 auto; padding: 0 clamp(16px, 4vw, 36px); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 6px; z-index: 10; }
.skip:focus { left: 8px; }

/* ---------- header ---------- */
.site-head { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; gap: 12px 28px; min-height: 60px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 750; font-size: 20px; letter-spacing: -0.02em; color: var(--ink); text-decoration: none; }
.brand svg { width: 26px; height: 26px; }
.site-nav { display: flex; gap: 22px; flex: 1; flex-wrap: wrap; font-size: 15px; }
.site-nav a { color: var(--mute); text-decoration: none; padding: 6px 0; }
.site-nav a:hover, .site-nav a[aria-current] { color: var(--ink); }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 20px; border-radius: 8px; border: 1px solid transparent; font: 650 16px/1.2 var(--sans); text-decoration: none; cursor: pointer; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #a5f01f; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: var(--surface); }
.btn[disabled] { opacity: 0.55; cursor: progress; }
.btn-small { padding: 8px 14px; font-size: 14px; }

/* ---------- type ---------- */
h1, h2, h3 { line-height: 1.08; letter-spacing: -0.025em; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(40px, 7vw, 78px); font-weight: 780; }
h2 { font-size: clamp(28px, 4.2vw, 44px); font-weight: 740; }
h3 { font-size: 19px; font-weight: 680; letter-spacing: -0.01em; line-height: 1.25; }
.eyebrow { margin: 0 0 18px; font: 600 13px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--mute); }
.lede { font-size: clamp(18px, 2.1vw, 21px); color: var(--mute); max-width: 62ch; margin: 22px 0 0; }
.section { padding: clamp(56px, 9vw, 104px) 0; border-top: 1px solid var(--line); }
.section > .wrap > .lede { margin-bottom: 36px; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--mute); }
.small { font-size: 14px; }

/* ---------- hero ---------- */
.hero { padding: clamp(48px, 9vw, 112px) 0 clamp(40px, 7vw, 80px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: clamp(28px, 5vw, 64px); align-items: center; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-note { margin-top: 22px; font-size: 14px; color: var(--mute); }
.timeline { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px; display: grid; gap: 22px; }
.timeline h3 { font: 600 13px/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--mute); margin-bottom: 10px; }
.tl-row { display: grid; grid-template-columns: repeat(20, 1fr); gap: 2px; height: 34px; }
.tl-seg { border-radius: 4px; display: flex; align-items: center; padding: 0 8px; font: 600 12px/1 var(--sans); white-space: nowrap; overflow: hidden; }
.tl-wait { background: var(--surface-2); color: var(--mute); }
.tl-paint { background: var(--accent); color: var(--accent-ink); }
.tl-fill { background: color-mix(in srgb, var(--accent) 38%, var(--surface-2)); color: var(--ink); }
.tl-scale { display: flex; justify-content: space-between; font: 12px/1 var(--mono); color: var(--mute); margin-top: 8px; }

/* ---------- race ---------- */
.race-controls { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 20px; }
.race-controls label { font-size: 15px; color: var(--mute); }
select, input[type="url"], input[type="text"] { font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 11px 12px; min-height: 46px; }
.lanes { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.lane { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; display: flex; flex-direction: column; }
.lane-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; padding: 14px 16px 10px; flex-wrap: wrap; }
.lane-head h3 { display: flex; align-items: center; gap: 8px; }
.swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; flex: none; }
.swatch-accel { background: var(--series-accel); }
.swatch-control { background: var(--series-control); }
.lane-status { font-size: 13px; color: var(--mute); }
.lane-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; padding: 0 16px 14px; }
.metric dt { font-size: 12px; color: var(--mute); }
.metric dd { margin: 2px 0 0; font: 650 22px/1.1 var(--mono); font-variant-numeric: tabular-nums; }
.metric dd small { font: 500 12px/1 var(--sans); color: var(--mute); margin-left: 2px; }
.lane-bar { height: 6px; background: var(--surface-2); }
.lane-bar i { display: block; height: 100%; width: 0; border-radius: 0 4px 4px 0; transition: width 0.25s ease-out; }
.lane-accel .lane-bar i { background: var(--series-accel); }
.lane-control .lane-bar i { background: var(--series-control); }
.lane iframe { width: 100%; height: 420px; border: 0; background: #fff; display: block; }
.race-foot { margin-top: 16px; font-size: 14px; color: var(--mute); }

/* ---------- steps / cards ---------- */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
.steps li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; counter-increment: step; }
.steps li::before { content: "0" counter(step); display: block; font: 600 13px/1 var(--mono); color: var(--mute); margin-bottom: 14px; }
.steps p, .card p { margin: 10px 0 0; color: var(--mute); font-size: 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 18px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.pill { display: inline-block; font: 600 12px/1 var(--mono); letter-spacing: 0.04em; padding: 5px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--mute); margin-bottom: 14px; }
.pill-live { border-color: color-mix(in srgb, var(--good) 50%, var(--line)); color: var(--good); }
.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.modes ol { margin: 14px 0 0; padding-left: 20px; color: var(--mute); font-size: 16px; }

/* ---------- analyzer ---------- */
.check-form { display: flex; gap: 10px; flex-wrap: wrap; max-width: 720px; }
.check-form input { flex: 1 1 280px; }
.result { margin-top: 28px; display: grid; gap: 18px; }
.result[hidden] { display: none; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; }
.tile { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.tile dt { font-size: 13px; color: var(--mute); }
.tile dd { margin: 6px 0 0; font: 680 28px/1.1 var(--mono); font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.tile dd small { font: 500 13px/1.3 var(--sans); color: var(--mute); display: block; margin-top: 6px; letter-spacing: 0; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.panel h3 { margin-bottom: 12px; }
.panel > p { margin: 0 0 12px; color: var(--mute); font-size: 15px; }
.findings { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.findings li { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: baseline; font-size: 15px; }
code, pre { font-family: var(--mono); font-size: 14px; }
code { background: var(--surface-2); padding: 2px 6px; border-radius: 5px; overflow-wrap: anywhere; }
pre { background: var(--surface-2); padding: 14px 16px; border-radius: 8px; overflow-x: auto; margin: 0; line-height: 1.5; }
pre code { background: none; padding: 0; }
.tag { font: 600 11px/1 var(--mono); padding: 4px 6px; border-radius: 4px; background: var(--surface-2); color: var(--mute); text-transform: uppercase; letter-spacing: 0.05em; }
.notice { border-left: 3px solid var(--warn); padding: 4px 0 4px 14px; color: var(--ink); font-size: 15px; margin: 0; }
.notice + .notice { margin-top: 8px; }
.error { color: var(--bad); font-weight: 600; margin: 16px 0 0; }
.ok { color: var(--good); }
.warn { color: var(--warn); }

/* ---------- dashboard ---------- */
.dash-head { padding: 40px 0 8px; }
.dash-head h1 { font-size: clamp(30px, 4.5vw, 46px); }
.dash-grid { display: grid; gap: 18px; padding: 24px 0 72px; }
.dash-two { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.legend { display: flex; gap: 18px; font-size: 14px; color: var(--mute); margin: 0 0 14px; flex-wrap: wrap; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.bars { display: grid; gap: 14px; }
.bar-group { display: grid; grid-template-columns: 130px 1fr; gap: 4px 12px; align-items: center; }
.bar-group .bar-label { grid-row: span 2; font-size: 14px; color: var(--mute); }
.bar-track { position: relative; height: 16px; display: flex; align-items: center; gap: 8px; }
.bar-track i { display: block; height: 100%; border-radius: 0 4px 4px 0; min-width: 2px; }
.bar-track b { font: 600 13px/1 var(--mono); font-variant-numeric: tabular-nums; color: var(--ink); white-space: nowrap; }
.bar-accel i { background: var(--series-accel); }
.bar-control i { background: var(--series-control); }
.stack { display: flex; height: 22px; gap: 2px; border-radius: 4px; overflow: hidden; }
.stack i { display: block; height: 100%; min-width: 2px; }
.stack-legend { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 12px; font-size: 14px; color: var(--mute); }
.stack-legend span { display: inline-flex; gap: 6px; align-items: center; }
.s-hit { background: var(--series-accel); }
.s-spec { background: color-mix(in srgb, var(--series-accel) 62%, var(--surface)); }
.s-sw { background: color-mix(in srgb, var(--series-accel) 34%, var(--surface)); }
.s-miss { background: var(--mute); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 9px 10px 9px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--mute); font-size: 13px; }
td.r, th.r { text-align: right; padding-right: 0; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.table-scroll { overflow-x: auto; }
.inline-form { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 14px; }
.empty { color: var(--mute); font-size: 15px; margin: 0; }

/* ---------- docs / legal ---------- */
.prose { max-width: 780px; padding: 48px 0 80px; }
.prose h1 { font-size: clamp(34px, 5vw, 52px); margin-bottom: 20px; }
.prose h2 { font-size: 26px; margin: 48px 0 14px; }
.prose h3 { margin: 28px 0 8px; }
.prose p, .prose li { color: var(--ink); }
.prose pre { margin: 14px 0; }
.prose table { margin: 14px 0; }
.todo { background: color-mix(in srgb, var(--warn) 14%, var(--surface)); border: 1px solid color-mix(in srgb, var(--warn) 45%, var(--line)); border-radius: 8px; padding: 14px 16px; }

/* ---------- footer ---------- */
.site-foot { border-top: 1px solid var(--line); padding: 32px 0 48px; color: var(--mute); font-size: 14px; }
.site-foot .wrap { display: flex; gap: 14px 28px; flex-wrap: wrap; justify-content: space-between; }
.site-foot nav { display: flex; gap: 20px; flex-wrap: wrap; }
.site-foot a { color: var(--mute); }

@media (max-width: 860px) {
  .hero-grid, .lanes, .steps, .modes, .dash-two { grid-template-columns: 1fr; }
  .lane iframe { height: 320px; }
  .site-nav { order: 3; flex-basis: 100%; gap: 16px; padding-bottom: 8px; overflow-x: auto; flex-wrap: nowrap; white-space: nowrap; }
  .bar-group { grid-template-columns: 96px 1fr; }
}
@media (prefers-reduced-motion: reduce) { .lane-bar i { transition: none; } }