/* ============================================================================
   Oriental VIN Decoder — public marketing homepage
   Always-dark cinematic surface. Tokens are the build brief §2 set.
   Sections, in order:
     1  Tokens
     2  Reset
     3  Typography + shared primitives
     4  Layout
     5  Navigation + mobile menu
     6  Loader
     7  Hero
     8  VIN form
     9  Teaser result
    10  3D canvas layer
    11  Inspection section
    12  Technical annotations
    13  How it works
    14  API
    15  Use cases
    16  Provider note
    17  Pricing
    18  Decode section
    19  Final CTA
    20  Footer
    21  Accessibility
    22  Responsive
    23  Reduced motion
   ========================================================================= */

/* ---------------------------------------------------------------- 1 TOKENS */
:root {
  /* Brand — build brief §2. Always-dark page; no light variant by design. */
  --color-primary: #C6FF3D;
  --color-primary-hover: #A8DB1F;
  --color-primary-muted: #1E2A0A;
  --color-secondary: #4DE8E0;
  --color-secondary-muted: #0F2E30;
  --color-success: #3DCF8E;
  --color-success-muted: #143528;
  --color-warning: #F0B429;
  --color-warning-muted: #3A2E10;
  --color-danger: #F07167;
  --color-danger-muted: #3A1715;

  --color-bg: #0D0F14;
  --color-surface: #171A20;
  --color-surface-raised: #1E222A;
  --color-border: #262B33;
  --color-border-strong: #3A4049;
  --color-text: #E9EDE8;
  --color-text-muted: #8B9690;
  --color-text-inverse: #0D0F14;

  /* Hero/inspection hairline rules only. 3.22:1 on --color-surface;
     --color-border-strong measures 1.67:1 there, too low for rule lines. */
  --color-divider-hero: rgba(255, 255, 255, 0.35);

  --font-display: "Syne", "Segoe UI", sans-serif;
  --font-body: "Space Grotesk", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", Consolas, monospace;

  --text-h1: 2rem;
  --text-h2: 1.5rem;
  --text-h3: 1.25rem;
  --text-body: 1rem;
  --text-body-sm: 0.875rem;
  --text-caption: 0.75rem;
  --text-vin: 1.125rem;

  /* Hero display was clamp(3rem, 8vw, 8rem) — far too large (one word ~¼ viewport).
     Kept fluid, but capped near design-language --text-display (3rem) with modest room. */
  --text-display-xl: clamp(2rem, 4vw, 3.25rem);
  --text-display-lg: clamp(1.75rem, 3vw, 2.5rem);
  --text-label: 0.72rem;
  --text-lede: clamp(1.05rem, 1.5vw, 1.35rem);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --shadow-glow-primary: 0 0 0 3px rgba(198, 255, 61, 0.22);

  --content-max: 1120px;
  --nav-h: 68px;
  --nav-offset: calc(var(--nav-h) + env(safe-area-inset-top, 0px));

  /* Cheap static grain (§36). Not animated — §5 bans ambient motion. */
  --noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

/* ----------------------------------------------------------------- 2 RESET */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  /* clip keeps horizontal bleed cut without creating a scroll container that
     breaks position:sticky (overflow-x:hidden does that in Chromium/WebKit). */
  overflow-x: clip;
}
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.55;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}
body::after {
  content: "";
  position: fixed; inset: 0; z-index: 999;
  background-image: var(--noise);
  opacity: 0.035;
  pointer-events: none;
  mix-blend-mode: overlay;
}
body.is-locked { overflow: hidden; }
img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}
canvas { display: block; max-width: 100%; }
pre, code, kbd, samp {
  max-width: 100%;
  overflow-wrap: anywhere;
}
pre { overflow-x: auto; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button, input { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }

/* ------------------------------------- 3 TYPOGRAPHY + SHARED PRIMITIVES */
.label {
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.lede {
  font-size: var(--text-lede);
  color: var(--color-text-muted);
  max-width: 62ch;
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-display-lg);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: var(--space-4) 0 var(--space-5);
  max-width: 18ch;
}
.section-head { margin-bottom: var(--space-8); }
.fineprint {
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
  max-width: 72ch;
  margin-top: var(--space-6);
}
.fineprint b { color: var(--color-text); font-weight: 500; }

.rule { display: block; height: 1px; background: var(--color-divider-hero); }
.rule--expand { transform: scaleX(0); transform-origin: left; }

.dot {
  display: inline-block; width: 7px; height: 7px;
  border-radius: var(--radius-full);
  background: var(--color-success);
  margin-inline-end: var(--space-2);
}

/* Buttons — design language §10.1. Never pill by default. */
.btn {
  --btn-h: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-2);
  min-height: var(--btn-h);
  padding: 0 var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--text-body-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  background: none;
  transition: background-color 140ms ease, border-color 140ms ease, color 140ms ease;
}
.btn--sm { --btn-h: 32px; padding: 0 var(--space-4); }
.btn--lg { --btn-h: 48px; padding: 0 var(--space-6); font-size: var(--text-body); }
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse); /* lime fills never take white text */
  font-weight: 700;
}
.btn--primary:hover:not(:disabled) { background: var(--color-primary-hover); }
.btn--secondary {
  border-color: var(--color-border-strong);
  color: var(--color-text);
}
.btn--secondary:hover:not(:disabled) { border-color: var(--color-text-muted); background: var(--color-surface); }
.btn--ghost { color: var(--color-text-muted); padding-inline: var(--space-3); }
.btn--ghost:hover { color: var(--color-primary); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Button working state — used by the auth forms (sign in, register, reset).
   Purely additive: nothing on the marketing pages carries .is-loading, so these
   rules cannot change how the landing page renders. Mirrors the same component
   in dashboard.css / admin.css so the auth handoff into the panels feels like
   one product rather than two.

   The button stays genuinely disabled (no double submit) but keeps full
   contrast — working is not the same as unavailable. */
.btn.is-loading,
.btn.is-loading:disabled {
  opacity: 1;
  cursor: progress;
}
.btn__spinner {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  opacity: 0.85;
  animation: btn-spin 600ms linear infinite;
}
@keyframes btn-spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  /* The global reduced-motion rule collapses animation-duration to 0.01ms,
     freezing the spinner mid-rotation, which reads as broken. Drop the
     animation and let the swapped label ("Signing in…") carry the meaning. */
  .btn__spinner {
    animation: none;
    border-color: currentColor;
    border-style: dotted;
    opacity: 0.6;
  }
}

/* ---------------------------------------------------------------- 4 LAYOUT */
.wrap {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
  min-width: 0;
}
main { position: relative; z-index: 1; min-width: 0; }

/* Sections below the cinematic run are opaque: they cover the fixed canvas
   without any extra JS, and reveal it again at the final CTA (§19, §25). */
.how, .cta-strip, .uses, .pricing, .foot, .docs-page {
  position: relative;
  z-index: 2;
  background: var(--color-bg);
  padding-block: var(--space-9);
}
.how {
  background: var(--color-surface);
  /* Pin scrub distance lives in ScrollTrigger; keep section padding on the stage. */
  padding-block: 0;
}
.how__stage {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-block: var(--space-9);
  box-sizing: border-box;
}
.uses { background: var(--color-surface); }
.foot { padding-block: var(--space-8) var(--space-6); }

/* ------------------------------------------------- 5 NAV + MOBILE MENU */
.nav {
  position: fixed; inset-block-start: 0; inset-inline: 0;
  z-index: 60;
  height: calc(var(--nav-h) + env(safe-area-inset-top, 0px));
  padding-block-start: env(safe-area-inset-top, 0px);
  border-bottom: 1px solid transparent;
  transition: background-color 220ms ease, border-color 220ms ease, backdrop-filter 220ms ease;
}
.nav.is-stuck {
  background: rgba(13, 15, 20, 0.82);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--color-divider-hero);
}
.nav__inner {
  height: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
  display: flex; align-items: center; gap: var(--space-6);
}
.nav__brand {
  display: inline-flex; align-items: center; gap: var(--space-3);
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.nav__mark {
  width: 10px; height: 18px;
  background: var(--color-primary);
  border-radius: 1px;
  clip-path: polygon(0 0, 100% 0, 55% 100%, 0 100%);
}
.nav__links { display: flex; gap: var(--space-6); margin-inline-start: auto; }
.nav__links a {
  position: relative;
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
  padding-block: var(--space-2);
  transition: color 140ms ease;
}
.nav__links a::after {
  content: "";
  position: absolute; inset-block-end: 0; inset-inline-start: 0;
  width: 100%; height: 1px;
  background: var(--color-primary);
  transform: scaleX(0); transform-origin: right;
  transition: transform 180ms ease;
}
.nav__links a:hover { color: var(--color-text); }
.nav__links a:hover::after { transform: scaleX(1); transform-origin: left; }
.nav__links a[aria-current="page"] {
  color: var(--color-text);
}
.nav__links a[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}
.nav__login[aria-current="page"] {
  color: var(--color-primary);
}
.nav__actions { display: flex; align-items: center; gap: var(--space-3); }
.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: none;
  cursor: pointer;
  padding: 0;
  place-content: center; place-items: center;
  gap: 5px;
}
.nav__toggle-bar { display: block; width: 16px; height: 1.5px; background: var(--color-text); }

.menu { position: fixed; inset: 0; z-index: 70; }
.menu__panel {
  position: absolute; inset: 0;
  background: var(--color-bg);
  border-inline-start: 1px solid var(--color-divider-hero);
  padding: var(--space-8) var(--space-5);
  padding-block: max(var(--space-8), env(safe-area-inset-top, 0px))
                 max(var(--space-8), env(safe-area-inset-bottom, 0px));
  padding-inline: max(var(--space-5), env(safe-area-inset-left, 0px))
                  max(var(--space-5), env(safe-area-inset-right, 0px));
  display: flex; flex-direction: column; gap: var(--space-5);
  justify-content: center;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.menu__close {
  position: absolute; inset-block-start: var(--space-4); inset-inline-end: var(--space-4);
  width: 44px; height: 44px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: none; cursor: pointer;
  font-size: 1.5rem; line-height: 1;
}
.menu__links { display: flex; flex-direction: column; gap: var(--space-4); }
.menu__links a {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  font-weight: 700;
  padding-block: var(--space-2);
}
.menu__links a:hover { color: var(--color-primary); }
.menu__links a[aria-current="page"] { color: var(--color-primary); }
.menu__cta { align-self: flex-start; }
.menu__note { font-size: var(--text-caption); color: var(--color-text-muted); }

/* ---------------------------------------------------------------- 6 LOADER */
.loader {
  position: fixed; inset: 0; z-index: 100;
  background: var(--color-bg);
  display: grid; place-items: center;
  padding: var(--space-5);
}
.loader.is-done { pointer-events: none; }
.loader__inner { width: min(420px, 100%); }
.loader__label {
  font-family: var(--font-body);
  font-size: var(--text-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.loader__bar { height: 1px; background: var(--color-border); overflow: hidden; }
.loader__fill {
  display: block; height: 100%; width: 0%;
  background: var(--color-primary);
  transition: width 200ms ease-out;
}
.loader__meta {
  display: flex; justify-content: space-between; gap: var(--space-4);
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}
.loader__pct { color: var(--color-primary); }
.loader__status { text-transform: uppercase; }

/* ------------------------------------------------------------------ 7 HERO */
.hero {
  position: relative;
  /* One viewport only — no extra empty runway between hero and section 01. */
  min-height: 100svh;
  display: flex;
  align-items: flex-start;
  padding: 0;
  overflow: hidden;
}
.hero__grid {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
  /* Own the first viewport: vertically centre copy under the nav. */
  box-sizing: border-box;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-block: calc(var(--nav-offset) + var(--space-6)) var(--space-8);
}
/* Copy column leaves the right half of the viewport for the car.
   Do not stretch headline across the full width — that caused text-over-car clash. */
.hero__copy { max-width: min(34rem, 48vw); width: 100%; }
.hero__label { margin-bottom: var(--space-5); }
.hero__headline {
  font-family: var(--font-display);
  font-size: var(--text-display-xl);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}
.hero__headline .line { display: block; overflow: hidden; }
.hero__headline .line > span { display: block; }
.hero__lede {
  font-size: var(--text-lede);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-bottom: var(--space-7);
}
.hero__ctas { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.hero .vin { margin-top: 0; }
.vin[hidden] { display: none !important; }

/* Decode mode styles kept for later — click handler is currently disabled. */
.hero.is-decoding .hero__marketing {
  display: none;
}
.hero.is-decoding .hero__scroll {
  opacity: 0;
  pointer-events: none;
}
.vin--stage {
  max-width: 28rem;
  animation: vinReveal 320ms cubic-bezier(0.16, 1, 0.3, 1) both;
}
.vin__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
  border: 0;
  background: none;
  padding: 0;
  font-family: var(--font-body);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
  cursor: pointer;
}
.vin__back:hover { color: var(--color-primary); }
.vin--stage > .label { margin-bottom: var(--space-3); }
@keyframes vinReveal {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: none; }
}

.chapter-edge {
  position: absolute;
  inset-block-start: calc(100svh - var(--space-8));
  inset-inline-end: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  writing-mode: vertical-rl;
}
.hero__scroll {
  position: absolute;
  inset-block-start: calc(100svh - var(--space-8) - 8px);
  inset-inline-start: var(--space-5);
  display: flex; align-items: center; gap: var(--space-3);
  font-size: var(--text-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.hero__scroll-line {
  display: block; width: 1px; height: 44px;
  background: var(--color-border-strong);
  overflow: hidden;
}
.hero__scroll-line i {
  display: block; width: 100%; height: 40%;
  background: var(--color-primary);
  transform: translateY(-100%);
  animation: scrollpulse 2.2s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}
@keyframes scrollpulse {
  0%   { transform: translateY(-100%); }
  60%  { transform: translateY(150%); }
  100% { transform: translateY(150%); }
}
.hero__handoff {
  position: absolute;
  inset-block-end: var(--space-9);
  inset-inline-start: 50%;
  translate: -50% 0;
  font-family: var(--font-body);
  font-size: var(--text-label);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-primary);
  opacity: 0;
  white-space: nowrap;
}

/* -------------------------------------------------------------- 8 VIN FORM */
.vin {
  border-block-start: 1px solid var(--color-divider-hero);
  padding-block-start: var(--space-5);
  max-width: 34rem;
}
.vin__label {
  display: block;
  font-size: var(--text-body-sm);
  font-weight: 500;
  margin-bottom: var(--space-2);
}
.vin__field { position: relative; }
.vin__input {
  width: 100%;
  height: 52px;
  padding: 0 var(--space-8) 0 var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-vin);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}
.vin__input::placeholder { color: var(--color-text-muted); text-transform: none; letter-spacing: 0; font-family: var(--font-body); font-size: var(--text-body); }
.vin__input:focus-visible { outline: none; border-color: var(--color-primary); box-shadow: var(--shadow-glow-primary); }
.vin__field.is-valid .vin__input { border-color: var(--color-success); }
.vin__field.is-error .vin__input { border-color: var(--color-danger); }
.vin__clear {
  position: absolute; inset-block-start: 50%; inset-inline-end: var(--space-2);
  translate: 0 -50%;
  width: 36px; height: 36px;
  border: 0; border-radius: var(--radius-full);
  background: none; color: var(--color-text-muted);
  cursor: pointer; font-size: 1.25rem; line-height: 1;
}
.vin__clear:hover { color: var(--color-text); background: var(--color-surface-raised); }
.vin__scan {
  position: absolute; inset-block-start: 0; inset-inline-start: 0;
  width: 100%; height: 100%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  opacity: 0; pointer-events: none;
}
.vin__scan::before {
  content: "";
  position: absolute; inset-block-start: 0; inset-inline-start: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
}
.vin__field.is-scanning .vin__scan { opacity: 1; }
.vin__field.is-scanning .vin__scan::before { animation: scanline 800ms linear infinite; }
@keyframes scanline { from { transform: translateY(0); } to { transform: translateY(52px); } }

.vin__meta {
  display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-4);
  margin-top: var(--space-2);
}
.vin__help { font-size: var(--text-caption); color: var(--color-text-muted); }
.vin__count {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
  white-space: nowrap;
}
.vin__count.is-complete { color: var(--color-success); }
.vin__error {
  margin-top: var(--space-2);
  font-size: var(--text-caption);
  color: var(--color-danger);
}
/* Not a failure — the input silently dropped a character and is saying so. */
.vin__error--note { color: var(--color-text-muted); }
.vin__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-4); }

/* --------------------------------------------------------- 9 TEASER RESULT */
.vin__result { margin-top: var(--space-6); }
.teaser { border-block-start: 1px solid var(--color-divider-hero); padding-block-start: var(--space-5); }
.teaser__status {
  display: flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-success);
  margin-bottom: var(--space-4);
}
.teaser__vin {
  font-family: var(--font-mono);
  font-size: var(--text-vin);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-5);
  word-break: break-all;
}
.teaser__fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  border-block-start: 1px solid var(--color-divider-hero);
  border-block-end: 1px solid var(--color-divider-hero);
  padding-block: var(--space-5);
}
.teaser__field dt {
  font-size: var(--text-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.teaser__field dd {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.teaser__locked {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding-block: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-body-sm);
}
.teaser__lock { flex: none; margin-top: 2px; color: var(--color-text-muted); }
.teaser__cta { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; }
.teaser__notice {
  margin-top: var(--space-5);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-inline-start: 2px solid var(--color-warning);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}
.teaser__notfound { color: var(--color-warning); }

/* --------------------------------------------------------- 10 CANVAS LAYER */
.scene {
  position: fixed; inset: 0;
  z-index: 0;
  pointer-events: none;
  transition: opacity 420ms ease;
}
.scene.is-hidden { opacity: 0; }
.scene__canvas { width: 100%; height: 100%; }
.scene__cursor {
  position: absolute; inset-block: 0; inset-inline-start: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(198, 255, 61, 0.16), transparent);
  opacity: 0;
  transition: opacity 300ms ease;
}
.scene__fallback {
  position: absolute; inset: 0;
  display: grid;
  place-items: center end;
  padding: var(--space-8);
  padding-inline-end: clamp(var(--space-5), 8vw, var(--space-9));
  /* Author `display: grid` must not defeat the HTML `hidden` attribute —
     otherwise the SVG silhouette always paints over / beside the WebGL car. */
}
.scene__fallback[hidden] {
  display: none !important;
}
.scene__fallback svg {
  width: min(520px, 46vw);
  height: auto;
  opacity: 0.92;
}

/* ------------------------------------------------------ 11 INSPECTION */
.inspection { position: relative; }
.inspection__sticky {
  position: sticky; inset-block-start: 0;
  height: 100svh;
  z-index: 2;
  pointer-events: none;
}
.inspection__canvas { position: absolute; inset: 0; }
.inspection__progress {
  position: absolute;
  inset-block-start: 50%; inset-inline-end: var(--space-5);
  translate: 0 -50%;
  display: flex; align-items: center; gap: var(--space-4);
}
.inspection__rail {
  position: relative;
  display: block; width: 1px; height: 160px;
  background: var(--color-border-strong);
}
.inspection__rail i {
  position: absolute; inset-block-start: 0; inset-inline-start: 0;
  width: 100%; height: 100%;
  background: var(--color-primary);
  transform: scaleY(0); transform-origin: top;
}
.inspection__ticks {
  display: flex; flex-direction: column; justify-content: space-between;
  height: 160px;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}
.inspection__ticks b { font-weight: 400; transition: color 200ms ease; }
.inspection__ticks b.is-on { color: var(--color-primary); }
.inspection__content {
  position: absolute;
  inset-block-start: calc(var(--nav-offset) + var(--space-5));
  inset-inline-end: var(--space-5);
  text-align: right;
}
.chapter-marker {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
}
.chapter-marker b { color: var(--color-primary); font-weight: 500; }

.inspection__steps { position: relative; z-index: 3; margin-block-start: -100svh; }
.inspection-step {
  min-height: 100svh;
  display: flex; align-items: center;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.inspection-step__body { max-width: 30rem; }
.inspection-step__body h2 {
  font-family: var(--font-display);
  font-size: var(--text-display-lg);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.025em;
  margin: var(--space-4) 0 var(--space-4);
}
.inspection-step__body > p:not(.label) {
  color: var(--color-text-muted);
  font-size: var(--text-lede);
  max-width: 44ch;
}
.fieldlist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2) var(--space-5);
  margin-top: var(--space-6);
  border-block-start: 1px solid var(--color-divider-hero);
  padding-block-start: var(--space-4);
}
.fieldlist li {
  position: relative;
  padding-inline-start: var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}
.fieldlist li::before {
  content: "+";
  position: absolute; inset-inline-start: 0;
  color: var(--color-primary);
}

.inspection__outro {
  position: relative; z-index: 3;
  min-height: 100svh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding-inline: var(--space-5);
  background: linear-gradient(180deg, transparent, var(--color-surface));
}
.inspection__outro-body { max-width: 42rem; }
.inspection__outro-body .label { margin-block: var(--space-5) var(--space-3); }
.inspection__outro-line {
  font-family: var(--font-display);
  font-size: var(--text-display-lg);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.025em;
}

/* --------------------------------------------------- 12 TECHNICAL ANNOTATIONS */
.anno {
  position: absolute;
  display: flex; align-items: center; gap: var(--space-2);
  opacity: 0;
  transition: opacity 320ms ease;
}
.anno.is-on { opacity: 1; }
.anno__dot {
  position: relative;
  width: 9px; height: 9px; flex: none;
}
.anno__dot::before, .anno__dot::after {
  content: "";
  position: absolute; inset-block-start: 50%; inset-inline-start: 50%;
  background: var(--color-primary);
  translate: -50% -50%;
}
.anno__dot::before { width: 9px; height: 1px; }
.anno__dot::after { width: 1px; height: 9px; }
.anno__rule { display: block; width: 56px; height: 1px; background: var(--color-divider-hero); flex: none; }
.anno__text {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
  white-space: nowrap;
}
/* Per-chapter anchor positions, kept in CSS so they reflow responsively (§17). */
.anno--a { inset-block-start: 34%; inset-inline-start: 52%; }
.anno--b { inset-block-start: 62%; inset-inline-start: 58%; }

/* ---------------------------------------------------------- 13 HOW IT WORKS */
.how__rail {
  height: 2px;
  background: var(--color-border);
  margin-bottom: var(--space-7);
  overflow: hidden;
  border-radius: 1px;
}
.how__rail i {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}
.how__steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-7); }
.how__num {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1;
  color: var(--color-text-muted);
  letter-spacing: -0.04em;
  margin-bottom: var(--space-4);
  transition: color 220ms ease;
}
.how__step.is-active .how__num { color: var(--color-primary); }
.how__step h3 {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 700;
  margin-bottom: var(--space-2);
  transition: color 220ms ease;
}
.how__step.is-active h3 { color: var(--color-text); }
.how__step p { color: var(--color-text-muted); font-size: var(--text-body-sm); }

/* ------------------------------------------------------------------- 14 API */
.api__grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: var(--space-8); align-items: start; }
.api__facts {
  display: grid; gap: var(--space-3);
  margin-top: var(--space-6);
  border-block-start: 1px solid var(--color-divider-hero);
  padding-block-start: var(--space-4);
}
.api__facts > div { display: grid; grid-template-columns: 10rem 1fr; gap: var(--space-4); }
.api__facts dt { font-size: var(--text-body-sm); color: var(--color-text-muted); }
.api__facts dd { font-size: var(--text-body-sm); }
.api__facts code { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--color-secondary); }
.api__key { margin-top: var(--space-6); font-size: var(--text-body-sm); color: var(--color-text-muted); }
.api__key-mask { color: var(--color-text); }

.api__panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
  min-width: 0;
}
.api__bar {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  border-block-end: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-2) 0 var(--space-2);
}
.tabs { position: relative; display: flex; gap: var(--space-1); overflow-x: auto; }
.tab {
  border: 0; background: none;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: color 140ms ease;
}
.tab:hover { color: var(--color-text); }
.tab[aria-selected="true"] { color: var(--color-primary); }
.tabs__ink {
  position: absolute; inset-block-end: 0; inset-inline-start: 0;
  height: 2px; width: 0;
  background: var(--color-primary);
  transition: transform 260ms cubic-bezier(0.16, 1, 0.3, 1), width 260ms cubic-bezier(0.16, 1, 0.3, 1);
}
.api__copy-btn {
  flex: none;
  margin: 0 var(--space-2) var(--space-2) 0;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: none;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
  cursor: pointer;
}
.api__copy-btn:hover { color: var(--color-text); border-color: var(--color-text-muted); }
.api__code { padding: var(--space-5); overflow-x: auto; }
.api__code pre { margin: 0; }
.api__code code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--color-text);
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}
/* CSS-only highlighting: tokens are marked up in HTML, coloured here.
   The whole syntax theme is built from §2's semantic colours — no separate
   editor palette, so nothing here can drift from the design system. */
.api__code .c { color: var(--color-text-muted); font-style: italic; } /* comment */
.api__code .k { color: var(--color-secondary); }                      /* keyword */
.api__code .f { color: var(--color-primary); }                        /* function */
.api__code .s { color: var(--color-success); }                        /* string */
.api__code .n { color: var(--color-warning); }                        /* number */
.api__code .a { color: var(--color-text-muted); }                     /* json key */

/* ------------------------------------------------------------ 15 USE CASES */
.uses__list { border-block-start: 1px solid var(--color-divider-hero); }
.use {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: var(--space-6);
  padding-block: var(--space-6);
  border-block-end: 1px solid var(--color-border);
}
.use__num {
  font-family: var(--font-mono);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
}
.use__body { max-width: 52ch; }
.use__body h3 {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-2);
  transition: color 160ms ease;
}
.use:hover .use__body h3 { color: var(--color-primary); }
.use__body > p { color: var(--color-text-muted); font-size: var(--text-body-sm); }
.use__cap {
  margin-top: var(--space-3);
  padding-inline-start: var(--space-4);
  border-inline-start: 1px solid var(--color-primary);
  font-size: var(--text-caption) !important;
}

/* ------------------------------------------------------------- 16 PROVIDER */
.flow {
  display: flex; flex-wrap: wrap; align-items: stretch; gap: var(--space-2);
  margin-top: var(--space-7);
}
.flow__node {
  display: flex; align-items: center;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.flow__node--accent { border-color: var(--color-primary); color: var(--color-primary); }
.flow__node + .flow__node { position: relative; margin-inline-start: var(--space-5); }
.flow__node + .flow__node::before {
  content: "→";
  position: absolute; inset-inline-start: calc(-1 * var(--space-5) + 1px);
  inset-block-start: 50%; translate: -50% -50%;
  color: var(--color-border-strong);
}

/* -------------------------------------------------------------- 17 PRICING */
.plans { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-5); }
.plan {
  position: relative;
  display: flex; flex-direction: column; gap: var(--space-3);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.plan--featured { border-color: var(--color-primary); background: var(--color-surface-raised); }
.plan__flag {
  position: absolute; inset-block-start: calc(-1 * var(--space-3)); inset-inline-start: var(--space-6);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-caption);
  font-weight: 700;
}
.plan__name { font-family: var(--font-display); font-size: var(--text-h3); font-weight: 700; }
.plan__price { display: flex; align-items: baseline; gap: var(--space-2); }
.plan__price b { font-family: var(--font-display); font-size: 2.25rem; font-weight: 800; letter-spacing: -0.03em; }
.plan__price span { color: var(--color-text-muted); font-size: var(--text-body-sm); }
.plan__quota {
  font-size: var(--text-body-sm);
  color: var(--color-primary);
  padding-block-end: var(--space-3);
  border-block-end: 1px solid var(--color-divider-hero);
}
.plan__for { font-size: var(--text-body-sm); color: var(--color-text-muted); }
.plan__list { display: grid; gap: var(--space-2); margin-block: var(--space-2) auto; padding-block-end: var(--space-4); }
.plan__list li {
  position: relative;
  padding-inline-start: var(--space-4);
  font-size: var(--text-body-sm);
}
.plan__list li::before { content: "+"; position: absolute; inset-inline-start: 0; color: var(--color-primary); }
.plan .btn { width: 100%; min-height: 44px; }

/* -------------------------------------------------------- CTA STRIP (home) */
.cta-strip {
  border-block: 1px solid var(--color-border);
}
.cta-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
}
.cta-strip__inner .section-title { margin-bottom: var(--space-3); }
.cta-strip__inner .lede { margin: 0; max-width: 48ch; }

/* ------------------------------------------------------- 18 DECODE SECTION */
.decode-section {
  position: relative;
  z-index: 1;
  isolation: isolate;
  padding-block: var(--space-9);
  border-block-start: 1px solid var(--color-border);
  /* Opaque so the fixed 3D car never shows through this section. */
  background:
    radial-gradient(70% 70% at 82% 20%, rgba(198, 255, 61, 0.08), transparent 58%),
    var(--color-bg);
  scroll-margin-top: calc(var(--nav-offset) + var(--space-5));
}
.decode__grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1fr);
  gap: var(--space-8);
  align-items: start;
}
.decode__copy {
  max-width: 34rem;
}
.decode__copy .section-title {
  max-width: 14ch;
}
.decode__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-7);
}
.decode__stats div {
  min-width: 0;
  padding-block-start: var(--space-4);
  border-block-start: 1px solid var(--color-divider-hero);
}
.decode__stats strong {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-h3);
  line-height: 1.1;
  color: var(--color-text);
}
.decode__stats span {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}
.decode__form {
  max-width: none;
  padding: var(--space-6);
  border: 1px solid var(--color-divider-hero);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(30, 34, 42, 0.92), rgba(23, 26, 32, 0.84)),
    var(--color-surface);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.28);
}
.decode__form > .label {
  margin-bottom: var(--space-3);
}

/* ----------------------------------------------------------- INNER PAGES */
.docs-page {
  padding-block-start: calc(var(--nav-offset) + var(--space-7));
}
.docs-hero {
  max-width: 48rem;
  margin-bottom: var(--space-8);
}
.docs-hero .section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  margin-bottom: var(--space-4);
  max-width: 28ch;
}
.docs-hero .lede {
  overflow-wrap: anywhere;
}
.docs-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: var(--space-8);
  align-items: start;
  min-width: 0;
}
.docs-content { min-width: 0; }
.docs-toc {
  position: sticky;
  top: calc(var(--nav-offset) + var(--space-4));
  align-self: start;
  min-width: 0;
  max-height: calc(100svh - var(--nav-offset) - var(--space-6));
  overflow-y: auto;
  overscroll-behavior: contain;
  z-index: 3;
  scrollbar-width: thin;
}
.docs-toc h2 {
  font-size: var(--text-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}
.docs-toc ul { display: grid; gap: var(--space-1); }
.docs-toc a {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  border-inline-start: 2px solid transparent;
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 140ms ease, background 140ms ease, border-color 140ms ease;
}
.docs-toc a:hover { color: var(--color-primary); }
.docs-toc a.is-active {
  color: var(--color-text);
  border-inline-start-color: var(--color-primary);
  background: rgba(198, 255, 61, 0.08);
}
.docs-toc a.is-active .method { color: var(--color-primary); }
.docs-toc .method {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  margin-inline-end: var(--space-2);
  color: var(--color-secondary);
}

.endpoint {
  padding-block: var(--space-7);
  border-block-start: 1px solid var(--color-divider-hero);
  scroll-margin-top: calc(var(--nav-offset) + var(--space-4));
}
.endpoint:first-of-type { border-block-start: 0; padding-block-start: 0; }
.endpoint__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.endpoint__method {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-primary-muted);
  color: var(--color-primary);
}
.endpoint__method--get { background: var(--color-secondary-muted); color: var(--color-secondary); }
.endpoint__method--delete { background: var(--color-danger-muted); color: var(--color-danger); }
.endpoint__path {
  font-family: var(--font-mono);
  font-size: var(--text-body-sm);
  color: var(--color-text);
  overflow-wrap: anywhere;
  word-break: break-word;
}
.endpoint__meta {
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}
.endpoint h3 {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.endpoint > p { color: var(--color-text-muted); font-size: var(--text-body-sm); max-width: 60ch; }
.endpoint__block {
  margin-top: var(--space-5);
}
.endpoint__block h4 {
  font-size: var(--text-caption);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.endpoint__block pre {
  margin: 0;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow-x: auto;
}
.endpoint__block code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--color-text);
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}
.endpoint__errors {
  margin-top: var(--space-3);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
  overflow-wrap: anywhere;
}
.docs-note {
  margin-top: var(--space-8);
  padding: var(--space-5);
  border-inline-start: 2px solid var(--color-primary);
  background: var(--color-surface);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
  max-width: 60ch;
  overflow-wrap: anywhere;
}
.docs-note--auth {
  margin-top: 0;
  margin-bottom: var(--space-6);
  max-width: none;
}
.docs-note--auth strong { color: var(--color-text); }

.nav--static {
  position: sticky;
  background: rgba(13, 15, 20, 0.92);
  border-block-end: 1px solid var(--color-divider-hero);
  backdrop-filter: blur(10px);
}
.nav--static .nav__brand { color: var(--color-text); }

/* ----------------------------------------------------------- AUTH PAGES */
.auth-page {
  padding-block: calc(var(--nav-offset) + var(--space-8)) var(--space-9);
  min-height: 100svh;
  background: var(--color-bg);
}
.auth-shell {
  width: min(28rem, 100%);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.auth-shell .label { margin-bottom: var(--space-3); }
.auth-shell h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: var(--space-3);
}
.auth-shell .lede {
  color: var(--color-text-muted);
  font-size: var(--text-body-sm);
  margin-bottom: var(--space-7);
  max-width: 42ch;
}
.auth-form { display: grid; gap: var(--space-5); }
.auth-form .btn { width: 100%; min-height: 44px; }
.field { display: grid; gap: var(--space-2); }
.field label {
  font-size: var(--text-caption);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.field input {
  width: 100%;
  height: 44px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-body);
}
.field input:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow-primary);
}
.field input.is-error { border-color: var(--color-danger); }
.field__hint { font-size: var(--text-caption); color: var(--color-text-muted); }
.field__error { font-size: var(--text-caption); color: var(--color-danger); }
.field__error[hidden], .auth-banner[hidden] { display: none !important; }

.password-field {
  position: relative;
  display: grid;
}
.password-field input {
  padding-right: 48px;
}
.password-toggle {
  position: absolute;
  top: 50%;
  right: 6px;
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  transform: translateY(-50%);
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
}
.password-toggle:hover { color: var(--color-text); }
.password-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.password-toggle svg { width: 18px; height: 18px; display: block; }
.password-toggle .icon-eye-off { display: none; }
.password-toggle[aria-pressed="true"] .icon-eye { display: none; }
.password-toggle[aria-pressed="true"] .icon-eye-off { display: block; }
.auth-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.auth-row a {
  font-size: var(--text-body-sm);
  color: var(--color-primary);
  text-decoration: none;
}
.auth-row a:hover { text-decoration: underline; }
.auth-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}
.auth-check input {
  flex: none;
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.2em;
  accent-color: var(--color-primary);
}
.auth-rules {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}
.auth-rules li {
  padding-inline-start: var(--space-4);
  position: relative;
}
.auth-rules li::before {
  content: "·";
  position: absolute;
  inset-inline-start: 0;
  color: var(--color-text-muted);
}
.auth-rules li.is-met { color: var(--color-success); }
.auth-rules li.is-met::before { content: "+"; color: var(--color-primary); }
.auth-banner {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-inline-start: 2px solid var(--color-success);
  border-radius: var(--radius-sm);
  background: var(--color-success-muted);
  font-size: var(--text-body-sm);
  color: var(--color-text);
}
.auth-banner--info {
  border-inline-start-color: var(--color-primary);
  background: var(--color-primary-muted);
}
.auth-footer-link {
  margin-top: var(--space-7);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}
.auth-footer-link a { color: var(--color-primary); text-decoration: none; }
.auth-footer-link a:hover { text-decoration: underline; }
.auth-note {
  margin-top: var(--space-5);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

/* ----------------------------------------------------------- FAQ PAGE */
.faq-list {
  display: grid;
  gap: 0;
  border-block-start: 1px solid var(--color-divider-hero);
}
.faq-item { border-block-end: 1px solid var(--color-border); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-5);
  padding-block: var(--space-5);
  min-height: 44px;
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-text);
  text-wrap: pretty;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--text-body);
  color: var(--color-primary);
}
.faq-item[open] summary::after { content: "–"; }
.faq-item[open] summary { color: var(--color-primary); }
.faq-item .faq-body {
  padding-block: 0 var(--space-5);
  max-width: 62ch;
  color: var(--color-text-muted);
  font-size: var(--text-body-sm);
  line-height: 1.6;
  overflow-wrap: anywhere;
}
.faq-item .faq-body code,
.faq-item .faq-body .mono {
  overflow-wrap: anywhere;
  word-break: break-word;
}
.faq-item .faq-body p + p { margin-top: var(--space-3); }

/* ------------------------------------------------------------ 19 FINAL CTA */
.final {
  position: relative; z-index: 1;
  min-height: 100svh;
  display: flex; align-items: center;
  padding-block: var(--space-9);
  background:
    radial-gradient(120% 80% at 50% 120%, rgba(198, 255, 61, 0.07), transparent 60%),
    var(--color-bg);
  overflow: hidden;
}
.final__inner {
  position: relative; z-index: 1;
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.final__headline {
  font-family: var(--font-display);
  font-size: var(--text-display-lg);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: var(--space-3) 0 var(--space-4);
}
.final__headline .line { display: block; overflow: hidden; }
.final__headline .line > span { display: block; }
.final__lede { font-size: var(--text-lede); color: var(--color-text-muted); max-width: 48ch; margin-bottom: var(--space-6); }
.final__links { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-5); }

/* ---------------------------------------------------------------- 20 FOOTER */
.foot { border-block-start: 1px solid var(--color-border); }
.foot__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-7);
  padding-block-end: var(--space-7);
}
.foot__word { font-family: var(--font-display); font-size: var(--text-h3); font-weight: 700; margin-bottom: var(--space-2); }
.foot__tag { font-size: var(--text-body-sm); color: var(--color-text-muted); max-width: 34ch; }
.foot__status {
  display: flex; align-items: center;
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}
.foot__col h2 {
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.foot__col ul { display: grid; gap: var(--space-2); }
.foot__col a { font-size: var(--text-body-sm); color: var(--color-text); }
.foot__col a:hover { color: var(--color-primary); }
.foot__legal {
  border-block-start: 1px solid var(--color-border);
  padding-block-start: var(--space-5);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
  max-width: 70ch;
}

/* -------------------------------------------------------- 21 ACCESSIBILITY */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; inset-block-start: var(--space-3); inset-inline-start: var(--space-3);
  z-index: 200;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-weight: 700;
  translate: 0 -200%;
}
.skip-link:focus-visible { translate: 0 0; }
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Reveal primitives. Scoped to .js-ready so that if app.js never boots (CDN
   blocked, module error) the escape hatch in index.html drops the class and
   every element is visible rather than stuck at opacity 0. */
.js-ready [data-reveal],
.js-ready [data-final-reveal] { opacity: 0; }

/* ----------------------------------------------------------- 22 RESPONSIVE */
/* Desktop-first (preserves ≥1280 layout). Breakpoints align with design-language
   §7.1 plus common device widths. Avoid duplicating rules across adjacent queries. */

@media (max-width: 1279px) {
  .api__grid { gap: var(--space-7); }
  .nav__links { gap: var(--space-5); }
  .nav__inner { gap: var(--space-5); }
}

@media (max-width: 1023px) {
  .api__grid { grid-template-columns: 1fr; }
  .decode__grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .how__steps { grid-template-columns: 1fr; gap: var(--space-6); }
  .plans { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .plan--featured { order: -1; grid-column: 1 / -1; }
  .foot__grid { grid-template-columns: 1fr 1fr; }
  .inspection__progress { inset-inline-end: var(--space-4); }
  .inspection__content { display: none; }
  /* Fewer annotations on tablet (§27). */
  .anno--b { display: none; }
  .docs-layout { grid-template-columns: 1fr; }
  .docs-toc {
    position: static;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-5);
    border-block-end: 1px solid var(--color-border);
  }
  .docs-toc ul {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
  }
  .docs-toc a {
    padding-block: var(--space-2);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
  .hero__copy { max-width: min(34rem, 52vw); }
  .cta-strip__inner { align-items: stretch; }
  .cta-strip__inner .btn { align-self: flex-start; }
  .section-title { max-width: 22ch; }
  .docs-hero .section-title { max-width: 28ch; }
  /* Long brand + links + CTA crowds iPad portrait — keep links, drop header CTA. */
  .nav__actions > .btn--primary { display: none; }
  .nav__links { gap: var(--space-4); }
  .nav__inner { gap: var(--space-4); }
  .plan { min-width: 0; }
  .fineprint { overflow-wrap: anywhere; }
}

@media (max-width: 819px) {
  .plans { grid-template-columns: 1fr; }
  .plan--featured { grid-column: auto; }
  .wrap,
  .nav__inner,
  .hero__grid,
  .inspection-step,
  .final__inner {
    padding-inline: var(--space-4);
  }
  .nav__links { gap: var(--space-3); }
  /* Small tablets: switch to hamburger — brand + 3 links + login no longer fit. */
  .nav__links,
  .nav__login { display: none; }
  .nav__toggle { display: inline-grid; }
  .nav__actions { margin-inline-start: auto; gap: 0; }
  .docs-page { padding-block-start: calc(var(--nav-offset) + var(--space-6)); }
  .auth-page { padding-block: calc(var(--nav-offset) + var(--space-6)) var(--space-8); }
  .endpoint__head { gap: var(--space-2); }
  .endpoint__path { font-size: 0.8125rem; }
  .faq-item summary { gap: var(--space-3); }
}

@media (max-width: 767px) {
  :root {
    --nav-h: 60px;
    --text-display-xl: clamp(1.75rem, 7.2vw, 2.5rem);
    --text-display-lg: clamp(1.5rem, 5.5vw, 2rem);
    --text-lede: clamp(1rem, 3.2vw, 1.2rem);
  }
  .nav__links,
  .nav__login,
  .nav__actions > .btn--primary { display: none; }
  .nav__toggle { display: inline-grid; }
  .nav__actions { margin-inline-start: auto; gap: 0; }
  .nav__brand { font-size: 1rem; }

  /* Mobile hero is composed, not shrunk (§27): headline and copy, then a gap
     the car occupies on its own, then the CTAs and VIN input below it. */
  .hero { min-height: 100svh; }
  .hero__grid {
    min-height: 100svh;
    align-items: flex-start;
    padding-block: calc(var(--nav-offset) + var(--space-6)) var(--space-6);
    display: block;
  }
  .hero__copy { max-width: none; }
  .hero__headline { margin-bottom: var(--space-4); line-height: 1.14; }
  .hero__lede { margin-bottom: var(--space-5); }
  .hero__ctas { margin-bottom: 42svh; } /* the car breathes in this gap */
  .hero__ctas .btn { flex: 1 1 auto; min-height: 44px; }
  .hero.is-decoding .vin--stage { margin-bottom: 36svh; }
  .hero .vin { margin-top: 0; max-width: none; }
  .scene__fallback {
    place-items: end center;
    padding-block-end: 28svh;
    padding-inline-end: var(--space-4);
  }
  .scene__fallback svg { width: min(420px, 88vw); }
  .hero__scroll, .chapter-edge { display: none; }
  .hero__handoff { white-space: normal; text-align: center; max-width: calc(100% - 2rem); }

  .vin__actions .btn { flex: 1 1 100%; min-height: 44px; }
  .vin__clear { width: 44px; height: 44px; }
  .vin__input {
    font-size: clamp(1rem, 3.6vw, 1.125rem);
    letter-spacing: 0.02em;
  }
  .teaser__fields { grid-template-columns: 1fr; gap: var(--space-5); }
  .teaser__cta .btn { flex: 1 1 auto; min-height: 44px; }

  .inspection-step__body { max-width: none; }
  .inspection-step {
    /* Keep copy legible over the car without hiding it. */
    background: linear-gradient(180deg, rgba(13, 15, 20, 0.1), rgba(13, 15, 20, 0.86) 30%);
  }
  .inspection__progress { display: none; }
  .anno { display: none; } /* annotations hidden on mobile (§17) */
  .fieldlist { grid-template-columns: 1fr; }

  .use { grid-template-columns: 1fr; gap: var(--space-3); }
  .flow { flex-direction: column; align-items: stretch; }
  .flow__node + .flow__node { margin-inline-start: 0; margin-block-start: var(--space-5); }
  .flow__node + .flow__node::before {
    content: "↓";
    inset-inline-start: var(--space-4);
    inset-block-start: calc(-1 * var(--space-4));
    translate: 0 -50%;
  }

  .api__bar {
    flex-wrap: wrap;
    align-items: stretch;
    gap: var(--space-2);
    padding-block-end: var(--space-2);
  }
  .tabs { width: 100%; }
  .api__copy-btn {
    margin: 0 var(--space-2) 0 auto;
    min-height: 44px;
  }
  .api__code { padding: var(--space-4); }
  .api__code code { font-size: 0.75rem; }

  .foot__grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .how, .cta-strip, .uses, .pricing, .decode-section, .docs-page { padding-block: var(--space-8); }
  .how { padding-block: 0; }
  .how__stage { padding-block: var(--space-8); min-height: auto; }
  .decode__stats { grid-template-columns: 1fr; margin-top: var(--space-6); }
  .decode__form { padding: var(--space-5); }
  .final { padding-block: var(--space-8); }
  .final__links .btn { min-height: 44px; }
  .cta-strip__inner .btn { min-height: 44px; width: 100%; max-width: 20rem; }
  .menu__cta { min-height: 48px; width: min(100%, 20rem); }
  .plan { padding: var(--space-5); }
  .plan__price b { font-size: clamp(1.75rem, 8vw, 2.25rem); }
  .docs-page { padding-block-start: calc(var(--nav-offset) + var(--space-6)); }
  .auth-page { padding-block: calc(var(--nav-offset) + var(--space-6)) var(--space-8); }
  .endpoint__block pre { padding: var(--space-3); }
  .endpoint__block code { font-size: 0.75rem; }
  .docs-hero .lede code,
  .docs-hero .lede .mono { overflow-wrap: anywhere; }
  .docs-hero .section-title { max-width: none; }
  .faq-item summary { font-size: clamp(1.05rem, 4.2vw, 1.25rem); }
  .auth-row { flex-direction: column; align-items: flex-start; }
  .auth-row a { min-height: 44px; display: inline-flex; align-items: center; }
  .field input { font-size: 1rem; } /* avoid iOS focus zoom */
  .docs-note { padding: var(--space-4); max-width: none; }
}

@media (max-width: 639px) {
  .menu__links a {
    font-size: var(--text-h2);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
  .api__facts > div { grid-template-columns: 1fr; gap: var(--space-1); }
  .section-head { margin-bottom: var(--space-6); }
  .section-title { margin-block: var(--space-3) var(--space-4); }
}

@media (max-width: 479px) {
  :root {
    --space-9: 72px;
    --text-h2: 1.35rem;
    --text-h3: 1.125rem;
  }
  .wrap,
  .nav__inner,
  .hero__grid,
  .inspection-step,
  .final__inner,
  .auth-shell {
    padding-inline: var(--space-3);
  }
  .nav__brand { font-size: 0.9375rem; gap: var(--space-2); }
  .hero__ctas { margin-bottom: 38svh; gap: var(--space-2); }
  .hero.is-decoding .vin--stage { margin-bottom: 32svh; }
  .vin__meta { flex-wrap: wrap; gap: var(--space-2); }
  .teaser__field dd { font-size: var(--text-h3); }
  .inspection__outro-line { font-size: clamp(1.35rem, 6.5vw, 1.75rem); }
  .final__headline { line-height: 1.05; }
  .foot__legal { max-width: none; }
  .loader__inner { width: 100%; }
  .plan__flag { inset-inline-start: var(--space-4); }
}

@media (max-width: 374px) {
  :root {
    --nav-h: 56px;
    --text-display-xl: clamp(1.5rem, 8vw, 1.85rem);
    --text-display-lg: clamp(1.35rem, 6.5vw, 1.65rem);
  }
  .nav__brand {
    font-size: 0.875rem;
    letter-spacing: -0.02em;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .hero__ctas { margin-bottom: 34svh; }
  .hero.is-decoding .vin--stage { margin-bottom: 28svh; }
  .btn--lg { padding-inline: var(--space-4); }
  .menu__links a { font-size: 1.35rem; }
  .auth-shell h1 { font-size: clamp(1.5rem, 7vw, 1.75rem); }
  .endpoint__meta { width: 100%; }
}

/* ------------------------------------------------------- 23 REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  /* Pinned scenes become normal flow; nothing auto-moves; nothing is hidden. */
  .inspection__sticky { position: relative; height: auto; }
  .inspection__steps { margin-block-start: 0; }
  .inspection__canvas, .inspection__progress, .inspection__content { display: none; }
  .inspection-step { min-height: auto; padding-block: var(--space-8); }
  .inspection__outro { min-height: auto; padding-block: var(--space-8); }
  /* No car gap to reserve when the scene isn't moving. */
  .hero__ctas { margin-bottom: var(--space-6); }
  .hero__scroll-line i { animation: none; transform: none; height: 100%; }
  .rule--expand { transform: scaleX(1); }
  /* Must out-specify `.js-ready [data-reveal]` above, not just follow it. */
  .js-ready [data-reveal],
  .js-ready [data-final-reveal] { opacity: 1; }
  .anno { display: none; }
}