/* ── Shop Layout ── */
.shop {
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 40px 80px;
}

/* ── Product Section ── */
.product {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

/* ── Gallery ── */
.gallery-main {
  position: sticky;
  top: 100px;
}

.gallery-main img {
  width: 100%;
  border-radius: 16px;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  background: var(--surface);
}

.gallery-thumbs {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.thumb {
  border: 2px solid transparent;
  border-radius: 10px;
  padding: 0;
  cursor: pointer;
  background: none;
  overflow: hidden;
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  transition: border-color 0.2s;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
}

.thumb:hover {
  border-color: var(--ink-faint);
}

.thumb.active {
  border-color: var(--ink);
}

/* ── Product Info ── */
.product-info {
  padding-top: 8px;
}

.product-eyebrow {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
  font-weight: 600;
  margin-bottom: 8px;
}

.product-info h1 {
  font-family: 'DM Serif Display', Georgia, serif;
  font-size: 3rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.product-tagline {
  font-size: 1.05rem;
  color: var(--ink-light);
  margin-bottom: 24px;
}

.product-price {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.product-price-note {
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-bottom: 32px;
}

.product-description {
  margin-bottom: 32px;
}

.product-description p {
  font-size: 1rem;
  color: var(--ink-light);
  line-height: 1.7;
}

/* ── CTA Button ── */
.product-cta {
  display: block;
  text-align: center;
  width: 100%;
  margin-bottom: 40px;
}

/* ── Specs ── */
.product-specs {
  margin-bottom: 32px;
}

.product-specs h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.spec {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.spec-label {
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-bottom: 2px;
}

.spec-value {
  font-size: 0.95rem;
  font-weight: 500;
}

/* ── Expandable Details ── */
.product-detail {
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.product-detail summary {
  padding: 16px 0;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.product-detail summary::-webkit-details-marker {
  display: none;
}

.product-detail summary::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--ink-faint);
  transition: transform 0.2s;
}

.product-detail[open] summary::after {
  content: '−';
}

.product-detail ul,
.product-detail p {
  padding: 0 0 16px 0;
  font-size: 0.9rem;
  color: var(--ink-light);
  line-height: 1.7;
}

.product-detail ul {
  list-style: none;
}

.product-detail li {
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.product-detail li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--ink-faint);
  font-weight: 700;
}

.product-detail a {
  color: var(--accent);
}

.product-detail a:hover {
  text-decoration: underline;
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .shop {
    padding: 100px 24px 60px;
  }

  .product {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .gallery-main {
    position: static;
  }

  .product-info h1 {
    font-size: 2.4rem;
  }
}

@media (max-width: 600px) {
  .product-info h1 {
    font-size: 2rem;
  }

  .spec-grid {
    grid-template-columns: 1fr;
  }

  .thumb {
    width: 60px;
    height: 60px;
  }
}