/* ==========================================================================
   Design tokens. Restyle here: colors, type, spacing, radius, focus ring.
   Contrast pairs are verified programmatically by tools/contrast-check.mjs —
   re-run `npm run check-contrast` after changing any color token.
   ========================================================================== */
:root {
  /* Palette (light) */
  --color-bg: #f4f6f8;
  --color-surface: #ffffff;
  --color-surface-raised: #ffffff;
  --color-border: #c9d2da;           /* decorative: card edges, dividers */
  --color-border-strong: #5f6b77;    /* functional: form control borders, >=3:1 */
  --color-text: #16202b;
  --color-text-muted: #45535f;
  --color-accent: #0b57d0;
  --color-accent-hover: #0a4cb5;
  --color-on-accent: #ffffff;
  --color-link: #0b57d0;
  --color-link-hover: #0a4cb5;
  --color-badge-low-bg: #fdeeda;
  --color-badge-low-text: #7a3d00;
  --color-badge-low-border: #b45309;
  --color-error-text: #b3261e;
  --color-focus: #0b57d0;
  --color-focus-halo: #ffffff;
  --color-pin-bg: #e7efe9;
  --color-pin-text: #1d4a2c;

  /* Type */
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --text-base: 1rem;
  --text-sm: 0.875rem;
  --text-lg: 1.25rem;
  --text-xl: clamp(1.75rem, 4vw, 2.5rem);
  --leading: 1.55;

  /* Spacing & shape */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --radius: 10px;
  --radius-pill: 999px;
  --shadow-card: 0 1px 2px rgb(22 32 43 / 0.08), 0 4px 14px rgb(22 32 43 / 0.06);

  /* Focus ring: two-layer so it passes 3:1 on any surface, both themes */
  --focus-ring-width: 3px;
  --focus-ring-offset: 2px;

  /* Layout */
  --max-width: 72rem;
  --target-min: 24px;
  --target-primary: 44px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14181d;
    --color-surface: #1d232b;
    --color-surface-raised: #232a33;
    --color-border: #46525e;
    --color-border-strong: #94a1af;
    --color-text: #e8edf2;
    --color-text-muted: #b0bcc8;
    --color-accent: #9cc2ff;
    --color-accent-hover: #b6d1ff;
    --color-on-accent: #0c2445;
    --color-link: #9cc2ff;
    --color-link-hover: #b6d1ff;
    --color-badge-low-bg: #3a2712;
    --color-badge-low-text: #ffce9c;
    --color-badge-low-border: #c98443;
    --color-error-text: #ffb4ab;
    --color-focus: #9cc2ff;
    --color-focus-halo: #14181d;
    --color-pin-bg: #1e3226;
    --color-pin-text: #a9d7b5;
    --shadow-card: none;
  }
}

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

html {
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading);
  color: var(--color-text);
  background: var(--color-bg);
}

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

a { color: var(--color-link); text-decoration: underline; }
a:hover { color: var(--color-link-hover); text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 var(--space-2); }
h1 { font-size: var(--text-xl); }
h2 { font-size: var(--text-lg); }
h3 { font-size: var(--text-base); }

:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-focus);
  outline-offset: var(--focus-ring-offset);
  box-shadow: 0 0 0 calc(var(--focus-ring-offset) + var(--focus-ring-width) + 2px) var(--color-focus-halo);
  border-radius: 4px;
}
main:focus { outline: none; box-shadow: none; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: var(--space-3); top: -100px;
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  color: var(--color-link);
  border-radius: var(--radius);
  transition: top 150ms ease;
}
.skip-link:focus { top: var(--space-2); }

/* ==========================================================================
   Buttons & form controls
   ========================================================================== */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  min-height: var(--target-primary);
  padding: 0.6rem 1.1rem;
  font: inherit; font-weight: 600;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }

.btn--primary { background: var(--color-accent); color: var(--color-on-accent); }
.btn--primary:hover { background: var(--color-accent-hover); color: var(--color-on-accent); }

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-link);
  border-color: var(--color-border);
}
.btn--secondary:hover { border-color: var(--color-link-hover); color: var(--color-link-hover); }

.btn--ghost {
  background: transparent;
  color: var(--color-link);
  border-color: var(--color-border);
  min-height: var(--target-min);
  padding: 0.35rem 0.8rem;
}
.btn--ghost:hover { border-color: var(--color-link-hover); color: var(--color-link-hover); }
.btn--ghost[aria-pressed="true"] { background: var(--color-pin-bg); color: var(--color-pin-text); border-color: currentColor; }
/* Pressed state gets a checkmark, never tint alone */
.card__save-check { display: none; }
.card__save[aria-pressed="true"] .card__save-check { display: inline; }

input, select, button { font: inherit; }

input[type="search"], input[type="number"], select {
  min-height: var(--target-primary);
  padding: 0.45rem 0.7rem;
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  width: 100%;
}
input::placeholder { color: var(--color-text-muted); opacity: 1; }

label { display: block; font-weight: 600; margin-bottom: var(--space-1); }

fieldset { border: 1px solid var(--color-border); border-radius: var(--radius); padding: var(--space-3); margin: 0 0 var(--space-3); }
legend { font-weight: 700; padding: 0 var(--space-1); }

input[type="checkbox"] {
  width: 1.5rem; height: 1.5rem; /* 24px: WCAG 2.5.8 minimum target */
  accent-color: var(--color-accent);
}

/* Disabled-state links (checkout without a purchasable variant): href is
   removed by JS; this is the visible signal. */
a.btn[aria-disabled="true"] {
  opacity: 0.55;
  border-style: dashed;
  border-color: var(--color-border-strong);
  cursor: not-allowed;
}

/* ==========================================================================
   Header / footer
   ========================================================================== */
.site-header { background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.site-header__inner {
  max-width: var(--max-width); margin: 0 auto;
  padding: var(--space-3);
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3);
}
.site-logo {
  font-weight: 800; font-size: var(--text-lg);
  color: var(--color-text); text-decoration: none;
  letter-spacing: -0.02em;
}
.site-logo:hover { color: var(--color-link-hover); text-decoration: underline; }

.site-search { flex: 1 1 22rem; }
.site-search form { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.site-search__field { flex: 1 1 9rem; }

.garage-link {
  display: inline-flex; align-items: center; gap: var(--space-1);
  min-height: var(--target-primary);
  padding: 0.4rem 0.9rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text); text-decoration: none; font-weight: 600;
}
.garage-link:hover { color: var(--color-link-hover); text-decoration: underline; }
.garage-link__badge {
  min-width: 1.4rem; text-align: center;
  padding: 0 0.3rem;
  background: var(--color-accent); color: var(--color-on-accent);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
}

.site-footer { margin-top: var(--space-5); background: var(--color-surface); border-top: 1px solid var(--color-border); }
.site-footer__inner {
  max-width: var(--max-width); margin: 0 auto;
  padding: var(--space-4) var(--space-3);
  color: var(--color-text-muted); font-size: var(--text-sm);
}
.site-footer__disclaimer { font-weight: 600; }

/* ==========================================================================
   Home: hero, picker, worlds
   ========================================================================== */
.hero__inner, .picker__inner, .worlds__inner {
  max-width: var(--max-width); margin: 0 auto; padding: var(--space-4) var(--space-3);
}
.hero { background: linear-gradient(160deg, var(--color-surface), var(--color-bg)); }
.hero__tagline { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 46rem; }

.picker__form { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-3); align-items: end; max-width: 34rem; }
.picker__form label { flex-basis: 100%; margin-bottom: 0; }
.picker__form select { flex: 1 1 14rem; width: auto; }
.picker__note { color: var(--color-text-muted); font-size: var(--text-sm); }

.worlds__grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
}
.tile {
  display: flex; flex-direction: column; gap: var(--space-1);
  padding: var(--space-4);
  min-height: 6.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  text-decoration: none;
  color: var(--color-text);
}
.tile:hover { border-color: var(--color-link-hover); }
.tile:hover .tile__label { color: var(--color-link-hover); text-decoration: underline; }
.tile__label { font-weight: 700; font-size: var(--text-lg); color: var(--color-link); }
.tile__hint { color: var(--color-text-muted); font-size: var(--text-sm); }

/* ==========================================================================
   Referral promo (config-gated aside; see lane.config.js `referrals`).
   Links inherit the bare `a` rules — persistent underline, do not override.
   ========================================================================== */
.referral { background: var(--color-surface); border-top: 1px solid var(--color-border); }
.referral__inner {
  max-width: var(--max-width); margin: 0 auto; padding: var(--space-4) var(--space-3);
}
.referral__inner p { max-width: 46rem; }
.referral__disclosure { color: var(--color-text-muted); font-size: var(--text-sm); }
.results, .breadcrumb, .detail { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-3); }
.results__header { padding-top: var(--space-4); display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-3); align-items: center; }

.chip {
  display: inline-flex; align-items: center; gap: var(--space-2);
  margin: 0;
  padding: var(--space-1) var(--space-2) var(--space-1) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
}
.chip__change {
  display: inline-flex; align-items: center;
  min-height: var(--target-min);
  padding: 0 var(--space-2);
}

.results__layout { display: grid; gap: var(--space-4); grid-template-columns: 1fr; margin-top: var(--space-3); }
@media (min-width: 56rem) {
  .results__layout { grid-template-columns: 16rem 1fr; align-items: start; }
}

.filters {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}
.filters__field { margin-bottom: var(--space-3); }
.filters__field--check { display: flex; align-items: center; gap: var(--space-2); }
.filters__field--check label { margin: 0; }
.filters__error { color: var(--color-error-text); font-weight: 600; font-size: var(--text-sm); margin: var(--space-2) 0 0; }
input[aria-invalid="true"] { border-color: var(--color-error-text); }

.results__count { color: var(--color-text-muted); margin: 0 0 var(--space-3); }
.results__notice { color: var(--color-error-text); font-weight: 600; }

.results__grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
}
.results__more { padding: var(--space-4) 0; }

/* Cards */
.card {
  position: relative;
  display: flex; flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.card__media { aspect-ratio: 4 / 3; background: #eef1f4; }
.card__media img { width: 100%; height: 100%; object-fit: contain; }
.card__media-empty { width: 100%; height: 100%; }
.card__body { display: flex; flex-direction: column; gap: var(--space-1); padding: var(--space-3); flex: 1; }
.card__title { margin: 0; font-size: var(--text-base); }
.card__link { color: var(--color-text); text-decoration: none; }
.card__link:hover { color: var(--color-link-hover); text-decoration: underline; }
/* Whole card is the hit area; the .card__cta row floats above the overlay */
.card__link::after { content: ""; position: absolute; inset: 0; }
.card__save { position: relative; z-index: 1; align-self: start; }
.card__price { margin: 0; font-weight: 700; }
.card__seller { margin: 0; color: var(--color-text-muted); font-size: var(--text-sm); }
.card__features { margin: var(--space-1) 0 0; padding-left: 1.1rem; color: var(--color-text-muted); font-size: var(--text-sm); }
.card__features li { margin-bottom: 2px; }

.card__badge {
  display: inline-flex; align-items: center; gap: var(--space-1);
  align-self: start;
  margin: 0;
  padding: 1px var(--space-2);
  font-size: var(--text-sm); font-weight: 600;
  border-radius: var(--radius-pill);
}
.card__badge--low {
  background: var(--color-badge-low-bg);
  color: var(--color-badge-low-text);
  border: 1px solid var(--color-badge-low-border);
}
.card__badge-dot { width: 0.5rem; height: 0.5rem; border-radius: 50%; background: currentColor; }

/* Card actions: everything interactive besides the title link must float
   above the title's ::after overlay */
.card__cta {
  display: flex; flex-wrap: wrap; gap: var(--space-2);
  margin-top: auto; padding-top: var(--space-2);
}
.card__cta .btn, .card__body button { position: relative; z-index: 1; align-self: start; }

.card--pinned { border: 2px solid var(--color-pin-text); }
.card__pin-label {
  margin: 0;
  padding: var(--space-1) var(--space-3);
  background: var(--color-pin-bg); color: var(--color-pin-text);
  font-weight: 700; font-size: var(--text-sm);
}

/* Breadcrumb */
.breadcrumb { padding-top: var(--space-3); font-size: var(--text-sm); }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-1); margin: 0; padding: 0; }
.breadcrumb li + li::before { content: "/"; margin: 0 var(--space-1); color: var(--color-text-muted); }
.breadcrumb a { display: inline-block; padding: 0.2rem 0; }
.breadcrumb [aria-current="page"] { color: var(--color-text-muted); text-decoration: none; }

/* ==========================================================================
   Detail page
   ========================================================================== */
.detail__layout { display: grid; gap: var(--space-4); grid-template-columns: 1fr; padding: var(--space-4) 0; }
@media (min-width: 56rem) { .detail__layout { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); } }
.detail__media {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  align-self: start;
}
.detail__media img { background: #fff; border-radius: 6px; }
.detail__seller { color: var(--color-text-muted); }
.detail__status { font-size: var(--text-lg); }
.detail__price { font-weight: 800; }
.detail__options { margin: var(--space-3) 0; max-width: 28rem; }
.detail__option { margin-bottom: var(--space-3); }
.detail__actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: var(--space-3) 0; }
.detail__fitment {
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border-left: 4px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.detail__section { margin-top: var(--space-4); }

/* PDP strips: similar-across-shops + recently viewed, as a media scroller
   (horizontal scroll-snap row; NOT a carousel — nothing auto-advances). */
.detail__strip {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-3) 0;
}
.detail__strip h2 { padding-right: 7rem; } /* keep clear of the nav buttons */
.detail__strip-more { margin-top: var(--space-2); }
.results__grid--strip {
  grid-template-columns: none;
  grid-auto-flow: column;
  grid-auto-columns: clamp(12rem, 16vw, 15rem);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  /* breathing room so the focus ring + halo never clip on the overflow
     edge — derived from the ring tokens so they can't drift apart */
  --strip-ring-room: calc(var(--focus-ring-width) + var(--focus-ring-offset) + 3px);
  padding: var(--strip-ring-room);
  margin: calc(-1 * var(--strip-ring-room));
  scroll-padding-inline: var(--strip-ring-room);
}
.results__grid--strip > li { scroll-snap-align: start; }
.results__grid--strip .card__features { display: none; }

.strip-nav {
  position: absolute;
  top: var(--space-4);
  right: var(--space-3);
  display: flex;
  gap: var(--space-2);
}
.strip-nav button {
  display: inline-flex; align-items: center; justify-content: center;
  width: var(--target-primary); height: var(--target-primary);
  border-radius: 50%;
  border: 1.5px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-link);
  cursor: pointer;
}
.strip-nav button:hover { border-color: var(--color-link-hover); color: var(--color-link-hover); }
/* Mute the glyph/border only — a focused disabled button keeps its full ring */
.strip-nav button[aria-disabled="true"] {
  color: var(--color-text-muted);
  border-color: var(--color-border);
  cursor: default;
}

/* Empty / error states */
.empty-state {
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-5) var(--space-4);
  text-align: center;
  max-width: 36rem;
  margin: var(--space-4) auto;
}

/* Garage list reuses .results__grid; remove buttons */
.garage-empty { text-align: center; }

/* ==========================================================================
   Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}