/* Race Engineer
   A setup sheet on a pit-lane clipboard: concrete grey page, ink rules,
   marshal-flag colours used only for what they mean on track
   (blue = act, green = fine, yellow = caution, red = stop). */

:root {
  --paper: #eceef0;
  --sheet: #fbfbfa;
  --ink: #16222d;
  --muted: #56636e;
  --line: #c2c9cf;
  --tyre: #20272d;
  --board: #16222d;
  --board-ink: #f3f5f6;
  --blue: #1d5fb8;
  --green: #1f8a4d;
  --yellow: #e9b915;
  --red: #c2311f;
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "Barlow", system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #11171c;
    --sheet: #1a222a;
    --ink: #e9edf0;
    --muted: #9aa6b0;
    --line: #36434e;
    --tyre: #05080a;
    --board: #0a0f13;
    --blue: #74aaf3;
    --green: #4cc480;
    --yellow: #f0c63a;
    --red: #f07a66;
  }
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.45 var(--body);
  font-variant-numeric: tabular-nums;
}

a { color: var(--blue); text-underline-offset: 0.15em; }

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

/* ---------- top bar ---------- */

.topbar {
  display: flex;
  align-items: stretch;
  gap: 1.5rem;
  padding: 0 1rem;
  background: var(--board);
  color: var(--board-ink);
}

.brand {
  padding: 0.7rem 0;
  font: 700 1.35rem/1 var(--display);
  letter-spacing: 0.01em;
  color: var(--board-ink);
  text-decoration: none;
  white-space: nowrap;
}

.topbar nav { display: flex; overflow-x: auto; }

.topbar nav a {
  display: flex;
  align-items: center;
  padding: 0 0.75rem;
  border-bottom: 3px solid transparent;
  color: var(--board-ink);
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
}

.topbar nav a:hover { border-bottom-color: #6b7884; }
.topbar nav a[aria-current="page"] { border-bottom-color: var(--yellow); }
.topbar nav .signout { opacity: 0.7; }

/* ---------- page ---------- */

main { max-width: 60rem; margin: 0 auto; padding: 1.25rem 1rem 2rem; }

h1 { margin: 0 0 0.25rem; font: 700 2.25rem/1.05 var(--display); }
h2 { margin: 0 0 0.6rem; font: 600 1.5rem/1.1 var(--display); }
h3 { margin: 1.25rem 0 0.4rem; font: 600 1.15rem/1.2 var(--display); color: var(--muted); }

.lede { margin: 0 0 1rem; max-width: 42rem; color: var(--muted); font-size: 1.0625rem; }
.crumb { margin: 0 0 0.25rem; font-size: 0.9375rem; }
.muted { color: var(--muted); }

.page-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem; margin-bottom: 1rem; }
.page-head h1 { margin: 0; }

section { margin-top: 2rem; padding-top: 0.75rem; border-top: 3px solid var(--ink); }

.empty { padding: 1.25rem; border: 1px dashed var(--line); max-width: 42rem; }

/* ---------- notices ---------- */

.notice { margin: 0 0 1rem; padding: 0.7rem 0.9rem; background: var(--sheet); border-left: 5px solid var(--line); }
.notice p, .notice ul { margin: 0; }
.notice ul { padding-left: 1.1rem; }
.notice-ok { border-left-color: var(--green); }
.notice-warn { border-left-color: var(--yellow); }
.notice-error { border-left-color: var(--red); }

/* ---------- fields ---------- */

.grid, .row-set {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(10.5rem, 1fr));
  gap: 0.8rem 1rem;
  align-items: end;
}

.span-2 { grid-column: span 2; }
.span-3 { grid-column: 1 / -1; }

.field { display: block; font-size: 0.9375rem; font-weight: 500; }
section > .field, details + .field { margin-top: 0.9rem; }

.unit { font-weight: 400; color: var(--muted); }
.hint { font-size: 0.875rem; font-weight: 400; color: var(--muted); }
p.hint { margin: 0 0 0.8rem; max-width: 44rem; }
.field > span.hint:last-child { display: block; margin-top: 0.15rem; }

input, select, textarea {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--sheet);
  color: var(--ink);
  font: 500 1rem/1.3 var(--body);
  font-variant-numeric: tabular-nums;
}

input::placeholder, textarea::placeholder { color: var(--muted); opacity: 0.65; font-weight: 400; }
input:disabled, select:disabled, textarea:disabled { background: transparent; opacity: 1; color: var(--ink); }

input[type="number"] { appearance: textfield; -moz-appearance: textfield; }
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }

textarea { resize: vertical; }
textarea.laps { max-width: 16rem; font-size: 1.125rem; line-height: 1.5; }

input[type="checkbox"] { display: inline-block; width: 1.2rem; height: 1.2rem; margin: 0; accent-color: var(--blue); }
.check { display: flex; align-items: center; gap: 0.55rem; font-weight: 500; cursor: pointer; }

fieldset.plain { min-width: 0; margin: 0; padding: 0; border: 0; }
.narrow { max-width: 24rem; }
.narrow .field { margin-bottom: 0.9rem; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1rem;
  border: 1.5px solid var(--ink);
  border-radius: 3px;
  background: transparent;
  color: var(--ink);
  font: 600 1rem/1.2 var(--body);
  text-decoration: none;
  cursor: pointer;
}

.btn:hover { background: var(--sheet); }
.btn-primary { border-color: var(--blue); background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue); filter: brightness(1.1); }
.btn-danger { border-color: transparent; color: var(--red); }
.btn-small { margin-top: 0.75rem; padding: 0.35rem 0.7rem; font-size: 0.9375rem; }

@media (prefers-color-scheme: dark) { .btn-primary { color: #0a0f13; } }

.actions {
  position: sticky;
  bottom: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 2rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.actions .btn-danger { margin-left: auto; }

/* ---------- tables ---------- */

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 0.55rem 0.75rem 0.55rem 0; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; white-space: nowrap; }
th { font-size: 0.875rem; font-weight: 600; color: var(--muted); }
.num { text-align: right; padding-right: 0; padding-left: 0.75rem; }

/* ---------- the car: four wheels around a chassis ---------- */

.car {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 2.25rem minmax(0, 1fr);
  gap: 1.25rem 0.5rem;
  margin-top: 0.9rem;
}

.chassis {
  grid-column: 2;
  grid-row: 1 / span 2;
  display: flex;
  justify-content: center;
  margin: 1.5rem 0;
  border: 2px solid var(--line);
  border-radius: 1.1rem 1.1rem 0.4rem 0.4rem;
}

.chassis span {
  margin-top: 0.6rem;
  writing-mode: vertical-rl;
  font: 600 0.9375rem/1 var(--display);
  color: var(--muted);
}

.wheel {
  min-width: 0;
  margin: 0;
  padding: 0.25rem 0.75rem 0.85rem;
  border: 1px solid var(--line);
  background: var(--sheet);
}

/* The thick dark edge is the tyre, on the outside of the car. */
.wheel-fl, .wheel-rl { grid-column: 1; border-left: 0.6rem solid var(--tyre); border-radius: 0.5rem 0 0 0.5rem; }
.wheel-fr, .wheel-rr { grid-column: 3; border-right: 0.6rem solid var(--tyre); border-radius: 0 0.5rem 0.5rem 0; }
.wheel-fl, .wheel-fr { grid-row: 1; }
.wheel-rl, .wheel-rr { grid-row: 2; }

.wheel legend { padding: 0 0.35rem; font: 600 1.15rem/1.2 var(--display); }
.wheel .field { margin-top: 0.6rem; }

.temps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.4rem; }
.temps input { padding-inline: 0.35rem; text-align: center; }

@media (max-width: 34rem) {
  .car { gap: 1rem 0.35rem; grid-template-columns: minmax(0, 1fr) 1.1rem minmax(0, 1fr); }
  .chassis span { display: none; }
  .wheel { padding-inline: 0.5rem; }
  .wheel input { padding-inline: 0.45rem; }

  /* Hot tyre readings need the full width for three temperatures. */
  .car:has(.temps) { grid-template-columns: minmax(0, 1fr); }
  .car:has(.temps) .chassis { display: none; }
  .car:has(.temps) .wheel { grid-column: 1; grid-row: auto; }
}

/* ---------- repeating rows ---------- */

.row-set { padding: 0.25rem 0 1rem; margin-bottom: 0.75rem; border-bottom: 1px dashed var(--line); }

/* ---------- car form: adjustable settings ---------- */

.param { padding: 0.6rem 0; border-top: 1px solid var(--line); }
.param:has(.param-toggle:not(:checked)) .param-body { display: none; }
.param-body { padding: 0.5rem 0 0.4rem 1.75rem; }
.range + .range, .copy-front + .range { margin-top: 0.9rem; }
.range-scope { margin: 0 0 0.3rem; font-weight: 600; }
.range-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.6rem 0.75rem; align-items: end; }
.range-wide { grid-column: 1 / -1; }

@media (max-width: 34rem) {
  .param-body { padding-left: 0; }
  .range-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

details.convert { margin-top: 0.6rem; }
details.convert summary { width: fit-content; font-size: 0.9375rem; color: var(--blue); cursor: pointer; }
details.convert .hint { margin: 0.4rem 0 0.6rem; }

/* ---------- calculated results (yellow rule = computed, not typed) ---------- */

.calc { margin-top: 1rem; border-top-color: var(--yellow); }
.calc dl { margin: 0; }
.calc dl div { display: flex; flex-wrap: wrap; gap: 0.15rem 1rem; padding: 0.4rem 0; border-bottom: 1px solid var(--line); }
.calc dt { flex: 0 0 14rem; color: var(--muted); }
.calc dd { margin: 0; flex: 1 1 14rem; font-weight: 500; }
.calc p.hint { margin-top: 0.7rem; }

.flag::before { content: ""; display: inline-block; width: 0.6rem; height: 0.6rem; margin-right: 0.4rem; border-radius: 50%; background: var(--green); }
.flag-warn::before { background: var(--yellow); }

/* ---------- start page ---------- */

.steps { margin: 1.5rem 0 0; padding: 0; list-style: none; counter-reset: step; max-width: 44rem; }
.steps li { counter-increment: step; display: flex; align-items: center; gap: 1rem; padding: 0.9rem 0; border-top: 1px solid var(--line); }
.steps li::before { content: counter(step); flex: 0 0 2rem; font: 700 2.25rem/1 var(--display); color: var(--muted); }
.steps li > div { flex: 1; }
.steps h2 { margin: 0; font-size: 1.35rem; }
.steps p { margin: 0.1rem 0 0; color: var(--muted); }
.tally { font-size: 0.9375rem; color: var(--muted); white-space: nowrap; }
.tally-done { color: var(--green); font-weight: 600; }

/* ---------- tables that become stacked rows on a phone ---------- */

@media (max-width: 34rem) {
  .stack thead { display: none; }
  .stack tr { display: block; padding: 0.6rem 0; border-bottom: 1px solid var(--line); }
  .stack td { display: flex; justify-content: space-between; gap: 1rem; padding: 0.15rem 0; border: 0; white-space: normal; text-align: right; }
  .stack td::before { content: attr(data-label); flex: 0 0 auto; color: var(--muted); text-align: left; }
  .stack td:first-child { justify-content: flex-start; font: 600 1.15rem/1.3 var(--display); }
  .stack td:first-child::before { content: none; }
}