/* ============================================================================
   GHOSTFRAME — Product detail page (PDP)
   Restyled to the mock_ui design system (dark, glass, Inter).
   Page-scoped: only linked by public/product.html. Pure visual restyle —
   every class here is rendered by js/product.js; no JS hooks are changed.
   ============================================================================ */

:root {
  --gf-bg:           #0A0A0B;
  --gf-bg-elev1:     #111114;
  --gf-bg-elev2:     #16161B;
  --gf-glass:        rgba(18, 18, 22, 0.72);
  --gf-glass-strong: rgba(12, 12, 16, 0.86);

  --gf-line:         rgba(255, 255, 255, 0.10);
  --gf-line-strong:  rgba(255, 255, 255, 0.20);
  --gf-line-faint:   rgba(255, 255, 255, 0.05);

  --gf-text:         #F5F1E8;
  --gf-text-mute:    rgba(245, 241, 232, 0.55);
  --gf-text-faint:   rgba(245, 241, 232, 0.32);

  --gf-good:         #C7E9C9;
  --gf-bad:          #E89A9A;

  --gf-r-sm:         8px;
  --gf-r-md:         14px;
  --gf-r-lg:         22px;
  --gf-r-pill:       999px;

  --gf-ease:         cubic-bezier(.16, .84, .32, 1.05);
  --gf-font:         'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  font-family: var(--gf-font);
  background-color: var(--gf-bg);
  color: var(--gf-text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.gf-pdp {
  padding-top: 60px;
  min-height: 100vh;
  background-color: var(--gf-bg);
  background-image:
    radial-gradient(120% 55% at 50% -8%, rgba(245, 241, 232, 0.05), transparent 60%);
}

.gf-pdp__loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 60px);
  color: var(--gf-text-faint);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* ──────────────────────────────── top nav ───────────────────────────────── */
.gf-nav,
.gf-nav.scrolled,
.gf-nav.on-hero,
.gf-nav.on-hero.scrolled {
  background: linear-gradient(180deg,
    rgba(10, 10, 11, 0.92) 0%, rgba(10, 10, 11, 0.30) 100%);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  border-bottom: 1px solid var(--gf-line-faint);
}
.gf-nav__logo { color: var(--gf-text); letter-spacing: 0.30em; font-weight: 800; }
.gf-nav__link { color: var(--gf-text-mute); transition: color 0.2s; }
.gf-nav__link:hover, .gf-nav__link.active { color: var(--gf-text); }
.gf-nav__link.active::after { background: var(--gf-text); }
.gf-nav__icon svg { stroke: var(--gf-text-mute); }
.gf-nav__icon:hover svg { stroke: var(--gf-text); }
.gf-nav__bag-count { background: var(--gf-text); color: var(--gf-bg); }
.gf-nav__hamburger span { background: var(--gf-text); }

/* ──────────────────────────────── layout ────────────────────────────────── */
.product-wrap {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 40px;
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 36px 40px 96px;
  align-items: start;
}

/* image panel */
.product-wrap > div:first-child {
  position: sticky;
  top: 84px;
  border-radius: var(--gf-r-lg);
  overflow: hidden;
  background:
    radial-gradient(120% 70% at 50% 0%, rgba(245, 241, 232, 0.07), transparent 62%),
    var(--gf-bg-elev2);
  border: 1px solid var(--gf-line);
}
.product-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  padding: 48px;
}

.product-info {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 8px;
}

.product-cat {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gf-text-faint);
}
.product-name {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.07;
  margin: 0;
}
.product-price {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--gf-text);
}
.product-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--gf-text-mute);
  margin: 2px 0 4px;
}

/* ─────────────────────────── colour / size ──────────────────────────────── */
.gf-pdp__section-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gf-text-faint);
  margin-bottom: 9px;
}
.gf-pdp__color-section,
.gf-pdp__size-section { margin-top: 6px; }

.color-swatches-row { display: flex; gap: 10px; flex-wrap: wrap; }
.gf-pdp__swatch {
  width: 30px; height: 30px;
  border-radius: 50%;
  border: 1px solid var(--gf-line-strong);
  cursor: pointer;
  padding: 0;
  box-shadow: 0 0 0 2px transparent;
  transition: box-shadow 0.2s, transform 0.15s;
}
.gf-pdp__swatch:hover { transform: scale(1.08); }
.gf-pdp__swatch.selected {
  box-shadow: 0 0 0 2px var(--gf-bg), 0 0 0 3.5px var(--gf-text);
}

.size-pills-row { display: flex; gap: 8px; flex-wrap: wrap; }
.gf-pdp__size-pill {
  min-width: 46px;
  padding: 9px 14px;
  border-radius: var(--gf-r-pill);
  border: 1px solid var(--gf-line);
  background: rgba(255, 255, 255, 0.02);
  color: var(--gf-text-mute);
  font-family: var(--gf-font);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.gf-pdp__size-pill:hover { color: var(--gf-text); border-color: var(--gf-line-strong); }
.gf-pdp__size-pill.selected {
  color: var(--gf-bg);
  background: var(--gf-text);
  border-color: var(--gf-text);
}

/* ─────────────────────────── dimensions ─────────────────────────────────── */
.dimensions-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 4px;
}
.dim-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 14px;
  border-radius: var(--gf-r-md);
  border: 1px solid var(--gf-line);
  background: rgba(255, 255, 255, 0.02);
}
.dim-label {
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gf-text-faint);
}
.dim-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--gf-text);
  font-variant-numeric: tabular-nums;
}

/* ─────────────────────────── face-fit hint ──────────────────────────────── */
.face-fit-hint {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--gf-r-md);
  background: rgba(199, 233, 201, 0.08);
  border: 1px solid rgba(199, 233, 201, 0.22);
  font-size: 12.5px;
  color: var(--gf-text-mute);
}
.face-fit-hint svg { color: var(--gf-good); flex-shrink: 0; }
.face-fit-hint strong { color: var(--gf-good); font-weight: 700; }
.face-fit-hint a {
  margin-left: auto;
  color: var(--gf-text);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}
.face-fit-hint a:hover { color: var(--gf-good); }

/* ────────────────────────────── specs ───────────────────────────────────── */
.specs { display: flex; flex-direction: column; margin-top: 2px; }
.spec-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px solid var(--gf-line-faint);
  font-size: 13px;
  color: var(--gf-text);
}
.spec-row:last-child { border-bottom: none; }
.spec-label {
  color: var(--gf-text-faint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ────────────────────────────── buttons ─────────────────────────────────── */
.btn-bag,
.btn-tryon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 50px;
  border-radius: var(--gf-r-pill);
  font-family: var(--gf-font);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.25s, background 0.2s, border-color 0.2s;
}
.btn-bag {
  margin-top: 10px;
  border: none;
  background: var(--gf-text);
  color: var(--gf-bg);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}
.btn-bag:hover:not(:disabled) { transform: translateY(-1px); }
.btn-bag:disabled {
  background: var(--gf-bg-elev2);
  color: var(--gf-text-faint);
  box-shadow: none;
  cursor: not-allowed;
}
.btn-tryon {
  margin-top: 8px;
  background: transparent;
  color: var(--gf-text-mute);
  border: 1px solid var(--gf-line);
}
.btn-tryon:hover { color: var(--gf-text); border-color: var(--gf-line-strong); }

/* ───────────────────────────── accordion ────────────────────────────────── */
.gf-pdp__accordion {
  margin-top: 22px;
  border-top: 1px solid var(--gf-line-faint);
}
.gf-pdp__accordion-item { border-bottom: 1px solid var(--gf-line-faint); }
.gf-pdp__accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 2px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--gf-font);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gf-text);
  text-align: left;
}
.gf-pdp__accordion-icon {
  font-size: 16px;
  font-weight: 400;
  color: var(--gf-text-mute);
  transition: transform 0.22s var(--gf-ease);
  line-height: 1;
}
.gf-pdp__accordion-item.open .gf-pdp__accordion-icon { transform: rotate(45deg); }
.gf-pdp__accordion-content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.24s var(--gf-ease);
}
.gf-pdp__accordion-item.open .gf-pdp__accordion-content { grid-template-rows: 1fr; }
.gf-pdp__accordion-content-inner {
  overflow: hidden;
  font-size: 13px;
  line-height: 1.65;
  color: var(--gf-text-mute);
}
.gf-pdp__accordion-item.open .gf-pdp__accordion-content-inner { padding-bottom: 15px; }
.gf-pdp__accordion-content-inner a { color: var(--gf-text); }

/* ──────────────────────── "added to bag" toast ──────────────────────────── */
.gf-pdp__notif {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 200;
  width: min(340px, calc(100vw - 32px));
  padding: 18px 20px;
  border-radius: var(--gf-r-md);
  background: var(--gf-glass-strong);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  border: 1px solid var(--gf-line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.28s var(--gf-ease), transform 0.28s var(--gf-ease);
}
.gf-pdp__notif.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.gf-pdp__notif-close {
  position: absolute;
  top: 10px; right: 12px;
  background: none; border: none;
  color: var(--gf-text-faint);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
}
.gf-pdp__notif-close:hover { color: var(--gf-text); }
.gf-pdp__notif-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}
.gf-pdp__notif-btns { display: flex; gap: 8px; }
.gf-pdp__notif-btn {
  flex: 1;
  padding: 11px 12px;
  border-radius: var(--gf-r-pill);
  font-family: var(--gf-font);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.gf-pdp__notif-btn--outline {
  background: transparent;
  border: 1px solid var(--gf-line);
  color: var(--gf-text-mute);
}
.gf-pdp__notif-btn--outline:hover { color: var(--gf-text); border-color: var(--gf-line-strong); }
.gf-pdp__notif-btn--filled {
  background: var(--gf-text);
  border: 1px solid var(--gf-text);
  color: var(--gf-bg);
}
.gf-pdp__notif-btn--filled:hover { opacity: 0.88; }

/* ──────────────────────────── error page ────────────────────────────────── */
.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  min-height: calc(100vh - 60px);
  padding: 40px;
  text-align: center;
  color: var(--gf-text-mute);
}
.error-page button {
  padding: 13px 26px;
  border-radius: var(--gf-r-pill);
  border: none;
  background: var(--gf-text);
  color: var(--gf-bg);
  font-family: var(--gf-font);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
}

/* ════════════════════════════════ responsive ════════════════════════════════ */
@media (max-width: 900px) {
  .product-wrap {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 20px 80px;
  }
  .product-wrap > div:first-child { position: static; }
  .product-img { padding: 32px; }
}

@media (max-width: 540px) {
  .product-wrap { padding: 18px 16px 72px; }
  .product-img { padding: 22px; }
  .dimensions-row { gap: 6px; }
  .dim-item { padding: 10px; }
  .gf-pdp__notif { right: 16px; left: 16px; bottom: 16px; width: auto; }
  .face-fit-hint { flex-wrap: wrap; }
  .face-fit-hint a { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .gf-pdp__accordion-content,
  .gf-pdp__notif,
  .gf-pdp__swatch { transition: none; }
}