/* BTYSHU site. Flat on purpose: solid fills, hard rules, no shadows or gradients. */

:root {
  --blue: #327ca4;
  --blue-deep: #235a78;
  --blue-tint: #e7f0f5;
  --green: #3ddc84;
  --ink: #14181b;
  --ink-soft: #4a525a;
  --line: #cfd6db;
  --paper: #faf9f5;
  --white: #ffffff;
  --red: #b3261e;
  --rule: 2px solid var(--ink);
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
}

img { display: block; max-width: 100%; }

a {
  color: var(--blue-deep);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
a:hover { color: var(--ink); }

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

code { font-family: var(--mono); font-size: 0.92em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 16px; top: 16px; z-index: 10;
  background: var(--white); color: var(--ink);
  padding: 8px 12px; border: var(--rule);
}

/* ---- header ------------------------------------------------------------------------------ */

.site-header { background: var(--blue); color: var(--white); border-bottom: 2px solid var(--blue-deep); }

.bar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 12px 24px; padding-top: 14px; padding-bottom: 14px;
}

.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--white); text-decoration: none;
  font: 700 20px/1 var(--mono); letter-spacing: 0.04em;
}
.brand:hover { color: var(--white); }
.brand img { width: 40px; height: 40px; }

.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px; font: 500 14px/1 var(--mono); }
.nav a {
  color: var(--white); text-decoration: none;
  padding: 6px 0; border-bottom: 2px solid transparent;
}
.nav a:hover, .nav a[aria-current] { color: var(--white); border-bottom-color: var(--green); }
.nav .nav-cta { padding: 9px 14px; background: var(--white); color: var(--ink); border: 2px solid var(--ink); }
.nav .nav-cta:hover, .nav .nav-cta[aria-current] { background: var(--green); color: var(--ink); border-color: var(--ink); }

/* ---- hero and page heads ----------------------------------------------------------------- */

.hero-band { background: var(--blue); color: var(--white); border-bottom: var(--rule); }

.hero {
  display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center;
  padding-top: 56px; padding-bottom: 72px;
}

.page-head { background: var(--blue); color: var(--white); border-bottom: var(--rule); padding: 56px 0 64px; }
.page-head .eyebrow { color: var(--white); }
.page-head h1 { max-width: 16em; font-size: clamp(34px, 4.6vw, 54px); }
.page-head .lede { margin-bottom: 0; }

.status {
  display: inline-flex; align-items: center; gap: 10px;
  margin: 0 0 22px; padding: 7px 12px;
  border: 2px solid var(--white);
  font: 500 13px/1 var(--mono);
}
.dot { width: 10px; height: 10px; background: var(--green); }

h1 {
  margin: 0 0 20px;
  font-size: clamp(38px, 5.4vw, 62px); line-height: 1.02; font-weight: 800;
  letter-spacing: -0.025em;
}

.lede { margin: 0 0 32px; max-width: 34em; font-size: 19px; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-block; padding: 13px 20px;
  font: 600 15px/1 var(--mono); text-decoration: none; text-align: center;
  border: 2px solid var(--ink); cursor: pointer;
}
.btn-light { background: var(--white); color: var(--ink); }
.btn-light:hover { background: var(--green); color: var(--ink); }
.btn-ghost { background: transparent; color: var(--white); border-color: var(--white); }
.btn-ghost:hover { background: var(--white); color: var(--ink); }
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: var(--ink); color: var(--white); }
.btn-outline { background: transparent; color: var(--ink); }
.btn-outline:hover { background: var(--ink); color: var(--white); }
.btn-green { background: var(--green); color: var(--ink); }
.btn-green:hover { background: var(--white); color: var(--ink); }
.btn-big { padding: 18px 26px; font-size: 17px; }

/* ---- tablet mock ------------------------------------------------------------------------- */

.tablet { margin: 0; }

/* The only rounded corners on the site, because it's drawing a physical object. */
.tablet-body { background: var(--ink); padding: 14px; border-radius: 22px; }

.screen {
  display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
  aspect-ratio: 16 / 10; overflow: hidden; border-radius: 8px;
}

.pane { position: relative; overflow: hidden; border-radius: 6px; background: var(--white); }

.pane-nav svg { position: absolute; inset: 0; width: 100%; height: 100%; }

.nav-card {
  position: absolute; top: 10px; left: 10px;
  display: grid; gap: 5px; padding: 8px 10px; border-radius: 4px;
  background: var(--ink); color: var(--white);
  font: 600 12px/1.1 var(--mono);
}
.nav-road { justify-self: start; padding: 2px 5px; background: var(--green); color: var(--ink); }

.pane-tag {
  position: absolute; left: 10px; bottom: 10px;
  padding: 4px 6px; background: var(--white); color: var(--ink-soft);
  border: 1px solid var(--line);
  font: 500 11px/1 var(--mono);
}

/* Container units size the cluster to its pane, the same way the app scales its numeral. The
   explicit colour matters: without it the pane inherits the hero's white text. */
.pane-dash { container-type: size; color: var(--ink); }

.dash-inner { display: flex; flex-direction: column; height: 100%; padding: 5cqh 7cqw; }

.dash-head { display: flex; justify-content: space-between; font: 500 4.4cqw/1 var(--mono); color: var(--ink-soft); }

.dash-speed { flex: 1; display: flex; flex-direction: column; align-items: flex-end; justify-content: center; }
.num { font: 300 min(34cqw, 30cqh)/0.9 var(--sans); letter-spacing: -0.04em; }
.unit { margin-top: 1cqh; font: 600 4.4cqw/1 var(--mono); letter-spacing: 0.2em; }
.limit { width: min(17cqw, 14cqh); margin-top: 3cqh; }
.fix { margin-top: 2.5cqh; font: 500 3.4cqw/1 var(--mono); letter-spacing: 0.08em; color: var(--ink-soft); }

.dash-obd dl { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2cqw; margin: 0 0 2.5cqh; }
.dash-obd dt { font: 600 3.1cqw/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.dash-obd dd { margin: 1.2cqh 0 0; font: 500 5.4cqw/1 var(--sans); }

.meter { height: max(3px, 1.4cqh); margin-top: 1.4cqh; background: #e2e6e9; }
.meter span { display: block; height: 100%; }
.meter-fuel span { width: 82%; background: var(--green); }
.meter-revs span { width: 36%; background: var(--blue); }

.tablet figcaption { margin-top: 14px; font: 500 13px/1.4 var(--mono); }

/* ---- stats ------------------------------------------------------------------------------- */

.stats { background: var(--white); border-bottom: var(--rule); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }

.stat { padding: 30px 24px; border-left: var(--rule); }
.stat:first-child { padding-left: 0; border-left: 0; }
.stat strong {
  display: block;
  font: 700 clamp(28px, 3.2vw, 40px)/1 var(--mono); letter-spacing: -0.03em;
  color: var(--blue-deep);
}
.stat span { display: block; margin-top: 10px; font-size: 15px; line-height: 1.45; color: var(--ink-soft); }

/* ---- sections ---------------------------------------------------------------------------- */

.section { padding: 88px 0; border-bottom: var(--rule); }
.section-alt { background: var(--blue-tint); }
.section-blue { background: var(--blue); color: var(--white); }
.section-blue .eyebrow, .section-blue .section-intro { color: var(--white); }

.eyebrow { margin: 0 0 12px; font: 600 14px/1 var(--mono); color: var(--blue-deep); }

h2 {
  margin: 0 0 16px;
  font-size: clamp(30px, 3.8vw, 42px); line-height: 1.1; font-weight: 800;
  letter-spacing: -0.02em;
}

.section-intro { margin: 0 0 40px; max-width: 40em; font-size: 18px; color: var(--ink-soft); }

.list-title { margin: 0 0 14px; font: 700 14px/1.2 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }

.more { display: inline-block; margin-top: 28px; font: 600 15px/1.2 var(--mono); }
.section-blue .more { color: var(--white); }
.section-blue .more:hover { color: var(--green); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split .section-intro { margin-bottom: 28px; }

/* ---- open by design ---------------------------------------------------------------------- */

/* White 2px gaps over a blue ground draw the grid, the same trick as the feature cards. */
.open-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px;
  background: var(--white); border: 2px solid var(--white);
}
.open-cell { padding: 28px 24px 30px; background: var(--blue); }
.open-cell h3 { margin: 0 0 10px; font-size: 22px; line-height: 1.2; }
.open-cell p { margin: 0; }

.tag {
  display: inline-block; margin-bottom: 16px; padding: 5px 8px;
  background: var(--green); color: var(--ink);
  font: 700 12.5px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
}

/* ---- feature cards ----------------------------------------------------------------------- */

/* Cards sit on an ink background with a 2px gap, which draws the grid lines without doubling
   borders where cards meet. */
.grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px;
  background: var(--ink); border: var(--rule);
}
.card { display: flex; flex-direction: column; padding: 26px 24px 22px; background: var(--white); }
.card h3 { margin: 0 0 10px; font-size: 19px; line-height: 1.25; }
.card p { margin: 0 0 20px; font-size: 15.5px; color: var(--ink-soft); }
.card code {
  align-self: flex-start; margin-top: auto; padding: 6px 8px;
  background: var(--blue-tint); color: var(--blue-deep);
  font: 500 12.5px/1 var(--mono);
}

/* ---- rules ------------------------------------------------------------------------------- */

.rules { margin: 32px 0 0; padding: 0; list-style: none; counter-reset: rule; border-top: var(--rule); }
.rules li {
  counter-increment: rule;
  display: grid; grid-template-columns: 72px 1fr 1.6fr; gap: 6px 24px; align-items: baseline;
  padding: 26px 0; border-bottom: var(--rule);
}
.rules li::before { content: counter(rule, decimal-leading-zero); font: 700 26px/1 var(--mono); color: var(--blue-deep); }
.rules h3 { margin: 0; font-size: 21px; line-height: 1.25; }
.rules p { margin: 0; color: var(--ink-soft); }

/* ---- hardware ---------------------------------------------------------------------------- */

.kit { border-top: var(--rule); }
.kit-item {
  display: grid; grid-template-columns: 1fr 1.25fr 1.25fr; gap: 20px 40px;
  padding: 40px 0; border-bottom: var(--rule);
}
.kit-item h2 { margin: 0; font-size: clamp(24px, 2.6vw, 30px); }
.kit-item p { margin: 0; }

.tips { margin: 0; padding: 0; list-style: none; }
.tips li { position: relative; padding: 0 0 12px 20px; color: var(--ink-soft); }
.tips li::before { content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px; background: var(--blue); }

/* ---- setups ------------------------------------------------------------------------------ */

.spec { margin: 0; background: var(--white); border: var(--rule); }
.spec div { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 14px 20px; border-top: 1px solid var(--line); }
.spec div:first-child { border-top: 0; }
.spec dt { font: 700 13px/1.6 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--blue-deep); }
.spec dd { margin: 0; font-weight: 600; }

.setup-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; align-items: stretch; }

.setup-card { background: var(--white); border: var(--rule); }
.setup-card .spec { border: 0; }
.setup-card-head {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 16px 20px; background: var(--ink); color: var(--white);
}
.setup-card-head h3 { margin: 0; font-size: 18px; line-height: 1.25; }
.credit {
  flex: none; padding: 5px 8px;
  background: var(--green); color: var(--ink);
  font: 700 12px/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase;
}
.setup-note { margin: 0; padding: 14px 20px; border-top: 1px solid var(--line); font-size: 15px; color: var(--ink-soft); }

.setup-slot {
  display: flex; flex-direction: column; align-items: flex-start; gap: 10px;
  padding: 28px; border: 2px dashed var(--ink); color: var(--ink-soft); text-decoration: none;
}
.setup-slot:hover { background: var(--white); border-style: solid; color: var(--ink-soft); }
.setup-slot .tag { margin-bottom: 6px; }
.setup-slot strong { font-size: 22px; line-height: 1.2; color: var(--ink); }
.setup-slot .more { margin-top: auto; padding-top: 12px; color: var(--blue-deep); }

/* ---- download ---------------------------------------------------------------------------- */

.download { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }

.download-card { padding: 32px; background: var(--white); border: var(--rule); }
.download-card h2 { margin-bottom: 6px; font-size: clamp(26px, 3vw, 34px); }
.download-meta { margin: 0 0 24px; font: 500 14px/1.4 var(--mono); color: var(--ink-soft); }
.download-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 32px; }

.needs { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.needs li { position: relative; padding: 10px 0 10px 22px; border-bottom: 1px solid var(--line); font-size: 15px; }
.needs li::before {
  content: ""; position: absolute; left: 0; top: 18px;
  width: 8px; height: 8px; background: var(--green); outline: 2px solid var(--ink);
}

/* The number is positioned rather than a grid column: in a grid, the loose text after each
   <strong> became its own item and got squeezed into the number's column a word per line. */
.steps { margin: 0; padding: 0; list-style: none; counter-reset: step; border-top: var(--rule); }
.steps li {
  counter-increment: step; position: relative;
  padding: 18px 0 18px 52px; border-bottom: 1px solid #b9c9d3; color: var(--ink-soft);
}
.steps li::before {
  content: counter(step);
  position: absolute; left: 0; top: 18px;
  display: grid; place-items: center; width: 32px; height: 32px;
  background: var(--ink); color: var(--white);
  font: 700 15px/1 var(--mono);
}
.steps strong { display: block; color: var(--ink); }

.after-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; margin-top: 32px;
  background: var(--ink); border: var(--rule);
}
.after-grid article { padding: 24px; background: var(--white); }
.after-grid h3 { margin: 0 0 8px; font-size: 19px; }
.after-grid p { margin: 0; color: var(--ink-soft); }
.after-note { margin: 28px 0 0; max-width: 48em; color: var(--ink-soft); }
.after-note strong { color: var(--ink); }

/* ---- call to action ---------------------------------------------------------------------- */

.cta-band { padding: 64px 0; background: var(--ink); color: var(--white); border-bottom: var(--rule); }
.cta-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px 48px; }
.cta-band h2 { margin: 0 0 8px; }
.cta-band p { margin: 0; font-size: 18px; color: #d5dde2; }

/* ---- forms ------------------------------------------------------------------------------- */

.form-layout { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 56px; align-items: start; }

.form fieldset { margin: 0 0 24px; padding: 0 24px 4px; background: var(--white); border: var(--rule); }
.form legend {
  padding: 7px 10px; background: var(--ink); color: var(--white);
  font: 700 13px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
}

/* Each field is a column with its control pinned to the bottom, so two fields sharing a row keep
   their boxes level even if one label, hint or error runs to an extra line. */
.fields { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0 16px; padding-top: 20px; }
.field { grid-column: 1 / -1; display: flex; flex-direction: column; margin-bottom: 20px; }
.field > input, .field > textarea { margin-top: auto; }

/* Five columns so a paired row splits 3:2. The short side needs the room: at a third of the width
   "Android version optional" wrapped onto two lines and pushed its box below its neighbour's.
   These come after .field on purpose, so they win over its full-width span. */
.field-pair { grid-column: span 3; }
.field-short { grid-column: span 2; }
.field label { display: block; margin-bottom: 6px; font-weight: 700; }
.optional { margin-left: 8px; font: 500 12px/1 var(--mono); color: var(--ink-soft); white-space: nowrap; }
.hint { margin: -2px 0 8px; font-size: 14px; color: var(--ink-soft); }
.field-error { margin: 0 0 8px; font-weight: 700; color: var(--red); }

.form input[type="text"], .form input[type="email"], .form textarea {
  display: block; width: 100%; padding: 11px 12px;
  font: 16px/1.4 var(--sans); color: var(--ink);
  background: var(--white); border: 2px solid var(--ink); border-radius: 0;
  appearance: none;
}
.form textarea { min-height: 140px; resize: vertical; }
.form input::placeholder, .form textarea::placeholder { color: #9aa2a8; opacity: 1; }
.form input:focus, .form textarea:focus { outline: 3px solid var(--green); outline-offset: 0; }
.has-error input, .has-error textarea { border-color: var(--red); border-left-width: 6px; }

.check { grid-column: 1 / -1; display: flex; gap: 12px; align-items: flex-start; margin-bottom: 20px; }
.check input { flex: none; width: 24px; height: 24px; margin: 0; accent-color: var(--blue); }
/* The whole label is the tap target, which matters far more on a phone than the box itself. */
.check label { flex: 1; padding: 1px 0; cursor: pointer; }

/* Off-screen rather than display:none, which the laziest bots know to skip. */
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

.form-privacy { margin: 0 0 20px; font-size: 15px; color: var(--ink-soft); }

.error-summary { margin: 0 0 24px; padding: 18px 20px; background: var(--white); border: 2px solid var(--red); border-left-width: 8px; }
.error-summary h2 { margin: 0 0 8px; font-size: 20px; }
.error-summary ul { margin: 0; padding-left: 18px; }
.error-summary a { font-weight: 600; color: var(--red); }

.notice { margin: 0 0 24px; padding: 16px 20px; background: var(--white); border: var(--rule); border-left: 8px solid var(--blue); }
.notice p { margin: 0; }

.form-aside { position: sticky; top: 24px; }

/* ---- prose ------------------------------------------------------------------------------- */

.prose { max-width: 760px; }
.prose h2 { margin: 48px 0 12px; font-size: 26px; }
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { font-size: 17px; color: var(--ink-soft); }
.prose strong { color: var(--ink); }
.prose ul { padding-left: 20px; }
.prose li { margin-bottom: 8px; }

/* ---- footer ------------------------------------------------------------------------------ */

.footer { padding: 48px 0 40px; font-size: 14px; color: var(--ink-soft); }
.footer-top {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px;
  padding-bottom: 32px; border-bottom: 1px solid var(--line);
}
.footer-top p { margin: 12px 0 0; max-width: 26em; }
.footer-title { margin: 0 0 12px; font: 700 13px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); }
.footer ul { margin: 0; padding: 0; list-style: none; }
.footer li { margin-bottom: 8px; }
.footer-top nav a { color: var(--ink); text-decoration: none; }
.footer-top nav a:hover { text-decoration: underline; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 6px 28px; padding-top: 20px; font-size: 13px; }
.footer-bottom p { margin: 0; }
.brand-dark, .brand-dark:hover { color: var(--ink); font-size: 18px; }
.brand-dark img { width: 32px; height: 32px; }

/* ---- 404 --------------------------------------------------------------------------------- */

.lost { display: grid; grid-template-columns: auto 1fr; gap: 40px; align-items: center; }
.lost img { width: 160px; filter: grayscale(1); opacity: 0.55; }
.lost .status { margin-bottom: 18px; }
.lost .lede { margin-bottom: 28px; }

/* ---- smaller screens --------------------------------------------------------------------- */

@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 36px; padding-bottom: 48px; }
  .page-head { padding: 40px 0 48px; }
  .section { padding: 64px 0; }
  .grid, .open-grid { grid-template-columns: 1fr 1fr; }
  .split, .download, .form-layout { grid-template-columns: 1fr; gap: 40px; }
  .kit-item { grid-template-columns: 1fr; gap: 16px; }
  .after-grid { grid-template-columns: 1fr; }
  .form-aside { position: static; }
  .rules li { grid-template-columns: 56px 1fr; }
  .rules p { grid-column: 2; }

  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat, .stat:first-child { padding: 22px 16px 22px 0; border-left: 0; }
  .stat:nth-child(even) { padding-left: 16px; border-left: var(--rule); }
  .stat:nth-child(n + 3) { border-top: var(--rule); }

  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-top > div { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .wrap { padding: 0 18px; }
  .nav { gap: 8px 14px; }
  .nav .nav-cta { padding: 7px 10px; }
  .grid, .open-grid, .setup-list { grid-template-columns: 1fr; }
  .lede { font-size: 17px; }
  .tablet-body { padding: 9px; border-radius: 16px; }
  .nav-card { top: 6px; left: 6px; padding: 5px 7px; font-size: 10px; }
  .pane-tag { display: none; }
  .download-card { padding: 24px 20px; }
  .btn-big { display: block; width: 100%; }
  .spec div { grid-template-columns: 1fr; gap: 2px; }
  .form fieldset { padding: 0 16px 4px; }
  .field-pair, .field-short { grid-column: 1 / -1; }
  .lost { grid-template-columns: 1fr; gap: 24px; }
  .lost img { width: 110px; }
}