/* handback.tech. One stylesheet, no web fonts, no scripts. Colours match the app. */
:root {
  color-scheme: light dark;
  --bg: #f6f6f3; --surface: #ffffff; --inset: #eeeeea; --text: #14161a; --muted: #5c6169; --line: #dcdcd6;
  --accent: #2456e8; --accent-hover: #1a44c2; --on-accent: #ffffff;
  --amber-fill: #fff4e0; --amber-text: #8f5200; --amber: #f2a20c;
  --ok-fill: #e8f5ec; --ok-text: #1e6b34;
  --radius-s: 8px; --radius-m: 12px; --radius-l: 20px;
  --content: 1080px; --text-width: 640px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0f11; --surface: #17191c; --inset: #212429; --text: #f2f3f5; --muted: #a1a6ad; --line: #2e3238;
    --accent: #5b8cff; --accent-hover: #7aa2ff; --on-accent: #0e0f11;
    --amber-fill: #2b2112; --amber-text: #ffb340; --amber: #f5b544;
    --ok-fill: #12261a; --ok-text: #4cd07d;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.5 var(--font); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-hover); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: var(--radius-s); z-index: 10; }
.skip:focus { left: 16px; }

.wrap { max-width: var(--content); margin: 0 auto; padding: 0 24px; }
.prose { max-width: var(--text-width); }
@media (max-width: 600px) { .wrap { padding: 0 16px; } }

/* Header and footer */
.site-header { border-bottom: 1px solid var(--line); background: var(--bg); }
.site-header .wrap { display: flex; align-items: center; gap: 24px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px; margin-right: auto; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.site-nav { display: flex; gap: 20px; flex-wrap: wrap; font-size: 15px; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 10px 0; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); }
.site-footer { border-top: 1px solid var(--line); margin-top: 96px; padding: 32px 0 48px; color: var(--muted); font-size: 14px; }
.site-footer p { margin: 0 0 8px; max-width: 760px; }
.site-footer nav { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 12px; }
.site-footer nav a { color: var(--text); }

/* Type */
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 12px; }
h1 { font-size: clamp(36px, 6vw, 56px); letter-spacing: -0.02em; }
h2 { font-size: clamp(26px, 4vw, 32px); }
h3 { font-size: 20px; }
p { margin: 0 0 16px; }
.lead { font-size: 20px; color: var(--muted); }
.eyebrow { font-size: 14px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 12px; }
.muted { color: var(--muted); }
.small { font-size: 15px; }
.mono { font-family: var(--mono); font-size: 14px; overflow-wrap: anywhere; }

/* Spacing helpers (no inline styles: the CSP allows none) */
.mt-16 { margin-top: 16px; } .mt-20 { margin-top: 20px; } .mt-24 { margin-top: 24px; }
.roomy { padding: 32px; } .measure { max-width: 720px; } .h-callout { font-size: 22px; }

/* Sections */
section { padding: 96px 0 0; }
@media (max-width: 600px) { section { padding-top: 64px; } }
.page { padding-top: 48px; }

/* Buttons */
.actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-top: 24px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 20px; border-radius: var(--radius-m);
  font: 600 17px var(--font); text-decoration: none; border: 1px solid transparent; cursor: pointer; }
.button.primary { background: var(--accent); color: var(--on-accent); }
.button.primary:hover { background: var(--accent-hover); color: var(--on-accent); }
.button.secondary { background: var(--surface); color: var(--text); border-color: var(--line); }
.store-note { font-size: 15px; color: var(--muted); }

/* Hero */
.hero { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); gap: 48px; align-items: center; padding-top: 64px; }
.hero h1 { max-width: 13em; }
@media (max-width: 820px) { .hero { grid-template-columns: minmax(0, 1fr); padding-top: 40px; } }
.screen { border-radius: 36px; border: 1px solid var(--line); overflow: hidden; background: var(--surface); max-width: min(320px, 100%); margin: 0 auto;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.04), 0 12px 32px rgb(0 0 0 / 0.08); }
.screen.small { max-width: min(280px, 100%); }

/* Grids and cards */
.grid { display: grid; gap: 16px; }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 820px) { .grid.three, .grid.two { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m); padding: 20px 24px; }
.card h3 { margin-bottom: 8px; }
.card p:last-child { margin-bottom: 0; }

.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 48px; align-items: center; }
.split.reverse > :first-child { order: 2; }
@media (max-width: 820px) { .split { grid-template-columns: minmax(0, 1fr); } .split.reverse > :first-child { order: 0; } }

/* Steps */
.steps { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 20px; counter-reset: step; }
.steps li { display: grid; grid-template-columns: 40px 1fr; gap: 16px; counter-increment: step; }
.steps li::before { content: counter(step); width: 40px; height: 40px; border-radius: 50%; background: var(--inset); color: var(--text);
  display: grid; place-items: center; font-weight: 700; }
.steps strong { display: block; }
.steps p { margin: 2px 0 0; color: var(--muted); }

.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.checklist li { padding-left: 30px; position: relative; }
.checklist li::before { content: ""; position: absolute; left: 4px; top: 7px; width: 12px; height: 7px; border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent); transform: rotate(-45deg); }

/* Car grid illustration */
.car-grid { width: 100%; max-width: 420px; margin: 0 auto; color: var(--muted); }
.car-grid .cell { fill: var(--surface); stroke: var(--line); }
.car-grid .body { fill: var(--inset); }
.car-grid .diff { fill: var(--amber); }
.car-grid .wheel { fill: var(--text); opacity: 0.8; }

/* Pricing */
.price { font-size: 36px; font-weight: 700; letter-spacing: -0.02em; margin: 4px 0 8px; }
.price span { font-size: 17px; font-weight: 400; color: var(--muted); }

/* Callouts */
.callout { border-radius: var(--radius-m); padding: 20px 24px; background: var(--inset); }
.callout.amber { background: var(--amber-fill); color: var(--amber-text); }
.callout.ok { background: var(--ok-fill); color: var(--ok-text); }
.callout p:last-child { margin-bottom: 0; }

/* FAQ */
details { border-bottom: 1px solid var(--line); padding: 4px 0; }
details:first-of-type { border-top: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; padding: 14px 32px 14px 0; list-style: none; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 4px; top: 10px; font-size: 22px; font-weight: 400; color: var(--muted); }
details[open] summary::after { content: "–"; }
details > :not(summary) { margin: 0 0 16px; color: var(--muted); }

/* Prose pages (support, privacy, terms) */
.prose h2 { margin-top: 40px; }
.prose ul { padding-left: 22px; }
.prose li { margin-bottom: 6px; }

/* Verify */
.verify { max-width: 600px; }
.verify form { display: grid; gap: 8px; margin: 24px 0; }
.verify label { font-weight: 600; }
.verify .hint { font-size: 15px; color: var(--muted); margin: 0; }
.verify .row { display: flex; gap: 8px; }
.verify input { flex: 1; min-width: 0; min-height: 48px; font: 17px var(--mono); padding: 0 14px; border: 1px solid var(--line);
  border-radius: var(--radius-s); background: var(--surface); color: var(--text); text-transform: uppercase; }
.verify input[aria-invalid="true"] { border-color: var(--amber-text); }
.verify .error { color: var(--amber-text); font-size: 15px; margin: 0; }
@media (max-width: 480px) { .verify .row { flex-direction: column; } }
.result { border: 1px solid var(--line); border-radius: var(--radius-m); background: var(--surface); overflow: hidden; }
.result-head { display: flex; gap: 12px; align-items: flex-start; padding: 20px 24px; }
.result-head svg { flex: none; width: 28px; height: 28px; }
.result-head h2 { font-size: 20px; margin: 2px 0 4px; }
.result-head p { margin: 0; }
.result.valid .result-head { background: var(--ok-fill); color: var(--ok-text); }
.result.mismatch .result-head { background: var(--amber-fill); color: var(--amber-text); }
.result.missing .result-head { background: var(--inset); }
.result-head p { color: var(--text); }
.result dl { display: grid; grid-template-columns: max-content 1fr; gap: 10px 20px; margin: 0; padding: 20px 24px; border-top: 1px solid var(--line); }
.result dt { color: var(--muted); }
.result dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 520px) { .result dl { grid-template-columns: 1fr; gap: 2px; } .result dd { margin-bottom: 10px; } }
.meaning { margin-top: 16px; }
.meaning h3 { font-size: 17px; margin-bottom: 6px; }
.meaning ul { margin: 0; padding-left: 20px; color: var(--muted); }
.permalink { display: none; }

@media print {
  :root { color-scheme: light; --bg: #fff; --surface: #fff; --text: #000; --muted: #333; --line: #bbb; }
  body { font-size: 12pt; }
  .site-header nav, .skip, .verify form, .site-footer nav, .no-print { display: none !important; }
  .site-footer { margin-top: 24px; }
  .result-head { background: none !important; color: #000 !important; }
  .permalink { display: block; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 10pt; }
}