/* Engine Check: garage-floor palette, fault colours borrowed from dash warning lamps. */
:root {
  --bg: #e4e8ea;
  --panel: #f3f5f6;
  --ink: #17212a;
  --muted: #53616c;
  --line: #c2cbd1;
  --amber: #e0980b;
  --amber-ink: #17212a;
  --ok: #16794c;
  --ok-bg: #d8eee2;
  --warn: #8a5300;
  --warn-bg: #fbebc8;
  --bad: #b3261e;
  --bad-bg: #f8dad7;
  --info: #2f5d86;
  --info-bg: #dce8f2;
  --display: "Bahnschrift SemiCondensed", "Bahnschrift", "DIN Alternate", "Roboto Condensed", "Arial Narrow", system-ui, sans-serif;
  --body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11171c;
    --panel: #1a2229;
    --ink: #e7ecef;
    --muted: #94a2ac;
    --line: #2d3a44;
    --amber: #f0a81c;
    --amber-ink: #11171c;
    --ok: #5fd08f;
    --ok-bg: #153524;
    --warn: #f2b451;
    --warn-bg: #3a2a0c;
    --bad: #ff8a80;
    --bad-bg: #40191a;
    --info: #8db8e0;
    --info-bg: #182b3b;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 var(--body);
  padding-bottom: calc(72px + env(safe-area-inset-bottom));
}

main, .top { max-width: 720px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }

:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }

/* ---------- Header ---------- */
.top { padding-top: calc(14px + env(safe-area-inset-top)); padding-bottom: 8px; }
.top-row { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
h1 { font: 600 1.5rem/1.1 var(--display); letter-spacing: 0.01em; margin: 0; }
h2 { font: 600 1.25rem/1.2 var(--display); margin: 28px 0 8px; }
h2:first-child { margin-top: 12px; }

.status { display: flex; align-items: center; gap: 8px; margin: 0; font-size: 0.9rem; color: var(--muted); }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.status.on .dot { background: var(--ok); }
.status.busy .dot { background: var(--amber); }

.conn { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.notice {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-left: 4px solid var(--info);
  background: var(--info-bg);
  border-radius: 0 6px 6px 0;
}
.notice.error { border-left-color: var(--bad); background: var(--bad-bg); }

/* ---------- Buttons and fields ---------- */
.btn {
  min-height: 44px;
  padding: 0 18px;
  font: 600 1rem var(--body);
  color: var(--ink);
  background: transparent;
  border: 1.5px solid var(--ink);
  border-radius: 6px;
  cursor: pointer;
}
.btn.primary { background: var(--amber); border-color: var(--amber); color: var(--amber-ink); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn:active:not(:disabled) { transform: translateY(1px); }

.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }

.field { display: flex; flex-direction: column; gap: 4px; font-size: 0.9rem; color: var(--muted); }
.field input, .field select {
  min-height: 44px;
  padding: 0 10px;
  font: 1rem var(--body);
  color: var(--ink);
  background: var(--panel);
  border: 1.5px solid var(--line);
  border-radius: 6px;
}
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin: 12px 0; }

.lede { color: var(--muted); max-width: 60ch; margin: 0 0 14px; }
.empty { color: var(--muted); margin: 20px 0; max-width: 60ch; }
.progress { margin: 12px 0; color: var(--muted); }

/* ---------- Live view: the tach strip is the one loud element ---------- */
.tach { display: grid; grid-template-columns: repeat(28, 1fr); gap: 3px; height: 36px; margin-top: 16px; }
.tach i { background: var(--line); border-radius: 1px; transition: background 0.08s; }
.tach i.on { background: var(--ink); }
.tach i.on.hot { background: var(--amber); }

.hero { display: flex; flex-wrap: wrap; gap: 8px 40px; margin: 16px 0 8px; }
.big-read { margin: 0; display: flex; align-items: baseline; gap: 8px; }
.big {
  font: 600 clamp(3.2rem, 17vw, 5.5rem)/0.95 var(--display);
  font-variant-numeric: tabular-nums;
  min-width: 2ch;
}
.unit { color: var(--muted); font-size: 1rem; }

.rows { margin: 12px 0 0; }
.rows .row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.rows dt { color: var(--muted); }
.rows dd { margin: 0; font: 600 1.15rem var(--display); font-variant-numeric: tabular-nums; }
.rows .vin dd { letter-spacing: 0.04em; overflow-wrap: anywhere; text-align: right; }
.rows dd small { font: 400 0.85rem var(--body); color: var(--muted); margin-left: 4px; }

/* ---------- Report ---------- */
.report { margin-top: 20px; }
.verdict { padding: 14px 16px; border-radius: 6px; border-left: 8px solid var(--line); background: var(--panel); }
.verdict h3 { font: 600 1.6rem/1.1 var(--display); margin: 0 0 4px; }
.verdict p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.verdict.ok { background: var(--ok-bg); border-left-color: var(--ok); }
.verdict.warn { background: var(--warn-bg); border-left-color: var(--amber); }
.verdict.bad { background: var(--bad-bg); border-left-color: var(--bad); }

.findings { list-style: none; margin: 16px 0; padding: 0; }
.finding { padding: 10px 12px; margin-bottom: 8px; border-left: 4px solid var(--line); background: var(--panel); border-radius: 0 6px 6px 0; }
.finding strong { display: block; }
.finding span { display: block; color: var(--muted); font-size: 0.92rem; margin-top: 2px; }
.finding.ok { border-left-color: var(--ok); }
.finding.warn { border-left-color: var(--amber); }
.finding.bad { border-left-color: var(--bad); }
.finding.info { border-left-color: var(--info); }
.tag { display: inline-block; margin-right: 8px; font-weight: 600; font-size: 0.85rem; }
.finding.ok .tag { color: var(--ok); }
.finding.warn .tag { color: var(--warn); }
.finding.bad .tag { color: var(--bad); }
.finding.info .tag { color: var(--info); }

.report h4 { font: 600 1.1rem var(--display); margin: 22px 0 6px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { text-align: left; padding: 8px 10px 8px 0; border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; }
th { color: var(--muted); font-weight: 600; }
.report .btn-row { margin-top: 22px; }
.fine-print { color: var(--muted); font-size: 0.85rem; max-width: 62ch; margin-top: 16px; }

/* ---------- History ---------- */
.history { list-style: none; margin: 0; padding: 0; }
.history li { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.history .meta strong { display: block; }
.history .meta span { color: var(--muted); font-size: 0.9rem; }
.history .btn { min-height: 40px; padding: 0 14px; }

/* ---------- Advanced ---------- */
.result { padding: 10px 12px; background: var(--panel); border-left: 4px solid var(--info); border-radius: 0 6px 6px 0; font-variant-numeric: tabular-nums; }
.log {
  max-height: 260px;
  overflow: auto;
  margin: 8px 0;
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  font: 0.8rem/1.4 ui-monospace, "Cascadia Mono", Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ---------- Tab bar ---------- */
.tabs {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--panel);
  border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabs button {
  min-height: 56px;
  font: 600 0.95rem var(--body);
  color: var(--muted);
  background: transparent;
  border: 0;
  border-top: 4px solid transparent;
  cursor: pointer;
}
.tabs button[aria-selected="true"] { color: var(--ink); border-top-color: var(--amber); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ---------- Print: only the report ---------- */
@media print {
  body { background: #fff; color: #000; padding: 0; }
  .top, .tabs, main > section:not(#tab-check), #tab-check > h2, #tab-check > .lede,
  #btn-check, #check-progress, .report .btn-row { display: none !important; }
  main { max-width: none; padding: 0; }
  .finding, .verdict { break-inside: avoid; }
}