/* ============================================================
   qibylift — Design tokens & base styles
   Light theme. Semantic tokens only; no page-level duplicates.
   ============================================================ */

:root {
  /* Color */
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-ink: #17150f;
  --color-ink-secondary: #57534a;
  --color-border: #e6e3db;
  --color-brand: #d84a1b;          /* energetic lift orange */
  --color-brand-strong: #b83a12;
  --color-brand-soft: #fdf0ea;
  --color-on-dark: #faf9f7;
  --color-dark-surface: #1c1a15;   /* hero / footer panels only */
  --color-success: #1a7a3d;
  --color-danger: #b3261e;

  /* Type */
  --font-sans: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: var(--font-sans);
  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-base: 1rem;
  --text-lg: 1.1875rem;
  --text-xl: 1.4375rem;
  --text-2xl: 2rem;
  --text-3xl: 2.75rem;
  --leading: 1.6;
  --leading-tight: 1.15;

  /* Layout */
  --container: 1200px;
  --gutter: 1.25rem;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --radius: 10px;
  --radius-lg: 16px;
  --tap: 48px;

  /* Media */
  --media-ratio: 4 / 3;
}

@media (min-width: 720px) {
  :root { --gutter: 2rem; }
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

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

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: var(--leading-tight);
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-lg); }
p  { margin: 0 0 var(--space-2); }

a { color: var(--color-brand-strong); text-underline-offset: 3px; }
a:hover { color: var(--color-brand); }

:focus-visible {
  outline: 3px solid var(--color-brand);
  outline-offset: 2px;
  border-radius: 4px;
}

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--space-5); }
.section--tight { padding-block: var(--space-4); }

/* Screen-reader only */
.sr-only {
  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(--gutter); top: -100%;
  background: var(--color-surface); color: var(--color-ink);
  padding: 0.6rem 1rem; border-radius: 0 0 var(--radius) var(--radius);
  z-index: 100;
}
.skip-link:focus { top: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: var(--tap);
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  border: 2px solid transparent;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn--primary { background: var(--color-brand); color: #fff; }
.btn--primary:hover { background: var(--color-brand-strong); color: #fff; }
.btn--ghost { border-color: currentColor; color: inherit; background: transparent; }
.btn--ghost:hover { background: rgba(255, 255, 255, 0.08); color: inherit; }
.btn--outline { border-color: var(--color-ink); color: var(--color-ink); background: transparent; }
.btn--outline:hover { background: var(--color-ink); color: var(--color-on-dark); }

/* ---------- Header / nav ---------- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 64px;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-decoration: none;
}
.brand__lift { color: var(--color-brand); }
.brand__dot { color: var(--color-brand); }

.site-nav ul {
  display: flex;
  gap: var(--space-2);
  list-style: none;
  margin: 0; padding: 0;
}
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
  padding: 0 0.75rem;
  color: var(--color-ink-secondary);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
}
.site-nav a:hover { color: var(--color-ink); }
.site-nav a[aria-current="page"] { color: var(--color-brand-strong); }

.nav-toggle {
  display: none;
  min-height: var(--tap);
  min-width: var(--tap);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius);
  font-size: 1.25rem;
  cursor: pointer;
}

@media (max-width: 819px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .site-nav {
    display: none;
    width: 100%;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
  }
  .site-nav.is-open { display: block; }
  .site-nav ul { flex-direction: column; gap: 0; padding-block: 0.5rem; }
  .site-header__inner { flex-wrap: wrap; }
  .site-nav { flex: 1 0 100%; order: 3; }
}

/* ---------- Hero ---------- */
.hero {
  background: var(--color-dark-surface);
  color: var(--color-on-dark);
  padding-block: var(--space-5);
}
.hero .eyebrow { color: var(--color-brand); }
.hero p { color: rgba(250, 249, 247, 0.78); max-width: 34em; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }

.eyebrow {
  font-size: var(--text-xs);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-brand-strong);
  margin-bottom: var(--space-1);
}

/* ---------- Cards & grids ---------- */
.grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-ink);
}
.card:hover { border-color: var(--color-ink-secondary); }

.card__media {
  aspect-ratio: var(--media-ratio);
  background: var(--color-brand-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}
.card__media--placeholder { color: var(--color-brand-strong); }
.card__media--placeholder span {
  font-size: 2.5rem;
  font-weight: 800;
  opacity: 0.5;
}
.card__body { padding: var(--space-2); display: flex; flex-direction: column; gap: 0.4rem; flex: 1; }
.card__sku {
  font-size: var(--text-xs);
  color: var(--color-ink-secondary);
  letter-spacing: 0.06em;
}
.card__name { font-size: var(--text-base); font-weight: 700; margin: 0; }
.card__meta { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }

.price { font-weight: 800; }
.price--unavailable {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-ink-secondary);
}
.badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--color-brand-soft);
  color: var(--color-brand-strong);
}

/* ---------- Filter pills ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: var(--space-3);
}
.filter-pill {
  min-height: 44px;
  padding: 0.35rem 1.1rem;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-ink-secondary);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
}
.filter-pill[aria-pressed="true"] {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-on-dark);
}

/* ---------- Split sections ---------- */
.split {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr;
}
@media (min-width: 820px) {
  .split { grid-template-columns: 1fr 1fr; gap: var(--space-4); }
}

.path-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.path-card h3 { margin-bottom: 0; }
.path-card p { margin: 0; color: var(--color-ink-secondary); }
.path-card .btn { align-self: flex-start; margin-top: auto; }

/* ---------- Spec table ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.spec-table th, .spec-table td {
  text-align: left;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.spec-table th {
  width: 38%;
  font-weight: 600;
  color: var(--color-ink-secondary);
  white-space: nowrap;
}
.spec-table td { word-break: break-word; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
@media (max-width: 480px) {
  .spec-table th { white-space: normal; }
}

/* ---------- Forms ---------- */
.form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  display: grid;
  gap: var(--space-2);
  max-width: 640px;
}
.form__row {
  display: grid;
  gap: var(--space-2);
}
@media (min-width: 640px) {
  .form__row--two { grid-template-columns: 1fr 1fr; }
}
.field { display: flex; flex-direction: column; gap: 0.35rem; }
.field label { font-size: var(--text-sm); font-weight: 600; }
.field .req { color: var(--color-brand-strong); }
.field input, .field textarea, .field select {
  font: inherit;
  min-height: var(--tap);
  padding: 0.55rem 0.8rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-ink);
}
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus {
  outline: 3px solid var(--color-brand);
  outline-offset: 0;
  border-color: var(--color-brand);
}
.field .error-msg {
  display: none;
  font-size: var(--text-xs);
  color: var(--color-danger);
  font-weight: 600;
}
.field.has-error input, .field.has-error textarea { border-color: var(--color-danger); }
.field.has-error .error-msg { display: block; }

.form__note { font-size: var(--text-xs); color: var(--color-ink-secondary); margin: 0; }
.form__actions { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; }

.form-status {
  display: none;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 600;
}
.form-status.is-visible { display: block; }
.form-status--success { background: #e8f4ec; color: var(--color-success); border: 1px solid #bfe3cc; }
.form-status--error { background: #fbeae9; color: var(--color-danger); border: 1px solid #eec4c1; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-dark-surface);
  color: rgba(250, 249, 247, 0.75);
  padding-block: var(--space-4);
  margin-top: var(--space-5);
}
.site-footer a { color: rgba(250, 249, 247, 0.85); }
.site-footer__grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .site-footer__grid { grid-template-columns: 2fr 1fr 1fr; }
}
.site-footer h3 {
  color: var(--color-on-dark);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-1);
}
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; }
.site-footer__bottom {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid rgba(250, 249, 247, 0.15);
  font-size: var(--text-xs);
}

/* ---------- Breadcrumb & page head ---------- */
.breadcrumb {
  font-size: var(--text-xs);
  color: var(--color-ink-secondary);
  padding-block: var(--space-2);
}
.breadcrumb ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.breadcrumb li:not(:last-child)::after { content: "/"; margin-left: 0.4rem; opacity: 0.5; }

.page-head { padding-block: var(--space-3) var(--space-2); }

/* ---------- Product detail ---------- */
.product-detail {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr;
}
@media (min-width: 860px) {
  .product-detail { grid-template-columns: 1.1fr 1fr; gap: var(--space-4); align-items: start; }
}
.product-detail__media {
  aspect-ratio: var(--media-ratio);
  background: var(--color-brand-soft);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-detail__media span { font-size: 3.5rem; font-weight: 800; color: var(--color-brand-strong); opacity: 0.5; }
.product-detail__actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.variant-picker { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-block: var(--space-2); }
.variant-chip {
  min-height: 44px;
  padding: 0.3rem 1rem;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
}
.variant-chip[aria-pressed="true"] {
  background: var(--color-brand);
  border-color: var(--color-brand);
  color: #fff;
}

/* Utility */
.center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.muted { color: var(--color-ink-secondary); }
.lead { font-size: var(--text-lg); color: var(--color-ink-secondary); max-width: 38em; }

/* ---------- Gallery ---------- */
.gallery-main {
  aspect-ratio: var(--media-ratio);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.gallery-main img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.gallery-thumbs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 0.6rem;
  margin-top: 0.8rem;
}
.gallery-thumb {
  aspect-ratio: 1;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  padding: 0;
  cursor: pointer;
  overflow: hidden;
}
.gallery-thumb img { width: 100%; height: 100%; object-fit: cover; }
.gallery-thumb[aria-pressed="true"] { border-color: var(--color-brand); }

/* ---------- Bullets ---------- */
.bullets {
  margin: 0 0 var(--space-2);
  padding-left: 1.2rem;
  display: grid;
  gap: 0.6rem;
  color: var(--color-ink-secondary);
  font-size: var(--text-sm);
}
.bullets li::marker { color: var(--color-brand); }

/* ---------- Stars & reviews ---------- */
.stars { color: var(--color-brand); letter-spacing: 2px; }
.stars--lg { font-size: 1.25rem; }
.card__rating { display: flex; align-items: center; gap: 0.5rem; font-size: var(--text-xs); }
.card__desc {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card__toprow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.review-summary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  max-width: 640px;
}
.desc-paras p { margin-bottom: var(--space-2); }
.desc-paras p:last-child { margin-bottom: 0; }
.review-headline {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}
.review-score {
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1;
}
.review-histogram {
  display: grid;
  gap: 0.45rem;
  padding-top: var(--space-2);
}
.hist-row {
  display: grid;
  grid-template-columns: 4.2rem 1fr 3rem;
  align-items: center;
  gap: 0.7rem;
  font-size: var(--text-sm);
}
.hist-label { color: var(--color-ink-secondary); }
.hist-bar {
  height: 10px;
  background: var(--color-border);
  border-radius: 999px;
  overflow: hidden;
}
.hist-fill {
  height: 100%;
  background: var(--color-brand);
  border-radius: 999px;
}
.hist-pct { text-align: right; color: var(--color-ink-secondary); }