/* ---- product layout ---- */
.product { position: relative; padding-block: clamp(1.5rem, 4vw, 3rem) var(--space-section); }
.product__backdrop {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}
.product__backdrop-img { width: 100%; height: 100%; object-fit: cover; opacity: 0.28; filter: blur(2px); }
.product__backdrop-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(60% 55% at 30% 40%, color-mix(in srgb, var(--glow) 22%, transparent), transparent 70%);
  animation: product-breathe 7s var(--ease) infinite alternate;
}
@keyframes product-breathe {
  from { opacity: 0.55; }
  to { opacity: 1; }
}

.product__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
}
.product__info-col { position: sticky; top: 90px; }
.product__info { display: flex; flex-direction: column; gap: 1.4rem; }

/* ---- gallery ---- */
.gallery { display: flex; flex-direction: column; gap: 0.85rem; }
.gallery__stage {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background:
    radial-gradient(120% 100% at 50% 100%, color-mix(in srgb, var(--glow) 16%, transparent), transparent 62%),
    var(--color-surface);
}
.gallery__slide { position: absolute; inset: 0; }
.gallery__slide[hidden] { display: none; }
.gallery__img { width: 100%; height: 100%; object-fit: cover; }
.gallery__glow { position: absolute; inset: 0; pointer-events: none; box-shadow: inset 0 0 80px -30px var(--glow-soft); }
.gallery__thumbs {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.gallery__thumb {
  width: 64px; height: 64px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  opacity: 0.6;
  transition: opacity var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.gallery__thumb.is-active { opacity: 1; border-color: var(--glow); }
.gallery__thumb:hover { opacity: 1; }
.gallery__thumb-img { width: 100%; height: 100%; object-fit: cover; }

/* ---- info blocks ---- */
.product__vendor { color: var(--glow); margin-bottom: 0.5rem; }
.product__title { margin: 0; }
.product__price .price__amount { font-size: 1.6rem; }
.product__description { color: var(--color-text-muted); }

/* ---- variant picker ---- */
.variant-picker { display: flex; flex-direction: column; gap: 1.2rem; }
.variant-picker__legend { display: flex; gap: 0.5rem; align-items: baseline; margin-bottom: 0.6rem; padding: 0; }
.variant-picker__selected { font-size: 0.9rem; color: var(--color-text); }
.variant-picker__fieldset { border: 0; padding: 0; margin: 0; }
.variant-picker__values { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.variant-picker__swatch {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55em 1em;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.variant-picker__swatch.is-color::before {
  content: "";
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--swatch);
  box-shadow: 0 0 10px -1px var(--swatch);
}
.variant-picker__input:checked + .variant-picker__swatch {
  border-color: var(--glow);
  box-shadow: 0 0 0 1px var(--glow), 0 0 22px -10px var(--glow-soft);
}
.variant-picker__input:focus-visible + .variant-picker__swatch { outline: 2px solid var(--glow); outline-offset: 2px; }

/* ---- quantity + buy ---- */
.product-form__form { display: flex; flex-direction: column; gap: 0.85rem; }
.product-form__row { display: flex; gap: 0.75rem; align-items: stretch; }
.product-form__qty { height: 100%; }
.qty__input {
  width: 3.2rem;
  text-align: center;
  background: transparent;
  border: none;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  -moz-appearance: textfield;
}
.qty__input::-webkit-outer-spin-button,
.qty__input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.product-form__buttons { flex: 1; }
.product-form__submit.is-loading { opacity: 0.7; }
.product-form__dynamic { margin-top: 0.25rem; }
.product-form__error { color: var(--color-ember); font-size: 0.85rem; margin: 0; }

/* ---- spec + accordion ---- */
.product__spec { display: grid; gap: 0; margin: 0.5rem 0; border-top: 1px solid var(--color-border); }
.product__spec > div { display: grid; grid-template-columns: 40% 1fr; gap: 1rem; padding: 0.7rem 0; border-bottom: 1px solid var(--color-border); }
.product__spec dt { color: var(--color-text-muted); font-size: 0.85rem; letter-spacing: 0.06em; text-transform: uppercase; }
.product__spec dd { margin: 0; font-size: 0.92rem; }

.product__accordion { border-bottom: 1px solid var(--color-border); }
.product__accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
}
.product__accordion summary::-webkit-details-marker { display: none; }
.product__accordion .icon { transition: transform var(--dur) var(--ease); }
.product__accordion details[open] summary .icon { transform: rotate(180deg); }
.product__accordion-body { padding-bottom: 1rem; color: var(--color-text-muted); }

/* ---- sticky ATC (mobile) ---- */
.sticky-atc {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 50;
  display: none;
  padding: 0.6rem 0;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--color-border);
}
.sticky-atc__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.sticky-atc__info { display: flex; flex-direction: column; }
.sticky-atc__title { font-size: 0.8rem; color: var(--color-text-muted); max-width: 40vw; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sticky-atc__price .price__amount { font-size: 1rem; }

@media (max-width: 900px) {
  .product__grid { grid-template-columns: 1fr; }
  .product__info-col { position: static; }
  .sticky-atc:not([hidden]) { display: block; }
}
@media (prefers-reduced-motion: reduce) {
  .product__backdrop-glow { animation: none; }
}