/* ============================================================
   product.css — Step 9: Product Detail Page Styles
   Mobile-first · Consistent with catalog.css design tokens
   ============================================================ */

/* ── Re-use catalog design tokens via references ────────── */
/* These mirror --catalog-* so the detail page is visually
   cohesive without duplicating values. If a shared tokens file
   is introduced later, consolidate here. */
:root {
  --detail-accent:         var(--catalog-accent, #1a73e8);
  --detail-accent-light:   var(--catalog-accent-light, #e8f0fe);
  --detail-text-primary:   var(--catalog-text-primary, #1e1e1e);
  --detail-text-secondary: var(--catalog-text-secondary, #5f6368);
  --detail-text-muted:     var(--catalog-text-muted, #80868b);
  --detail-bg-card:        var(--catalog-bg-card, #ffffff);
  --detail-bg-page:        var(--catalog-bg-page, #f5f7fa);
  --detail-border:         var(--catalog-border, #dadce0);
  --detail-price-color:    var(--catalog-price-color, #0a6f2f);
  --detail-card-radius:    var(--catalog-card-radius, 10px);
  --detail-transition:     var(--catalog-transition, 0.22s ease);

  /* Detail-specific */
  --detail-thumb-size:     72px;
  --detail-thumb-gap:      8px;
  --detail-condition-bg:   #fef7e0;
  --detail-condition-border: #f0c060;
}

/* ── Main Layout ─────────────────────────────────────────── */
.detail-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 16px 56px;
  min-height: 60vh;
}

/* ── Breadcrumb ──────────────────────────────────────────── */
.detail-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.detail-breadcrumb__link {
  font-size: 0.8rem;
  color: var(--detail-accent);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--detail-transition);
}

.detail-breadcrumb__link:hover {
  color: #1558b0;
  text-decoration: underline;
}

.detail-breadcrumb__sep {
  color: var(--detail-text-muted);
  font-size: 0.75rem;
}

.detail-breadcrumb__current {
  font-size: 0.8rem;
  color: var(--detail-text-muted);
  font-weight: 500;
  /* Clamp long product names in breadcrumb */
  max-width: 180px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Hero: stacked on mobile, side-by-side on desktop ────── */
.detail-hero {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* ── Gallery (left column on desktop) ────────────────────── */
.detail-gallery {
  width: 100%;
}

/* Main image container — enforced 1:1 square */
.detail-gallery__main {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #f1f3f4;
  border-radius: var(--detail-card-radius);
  overflow: hidden;
}

.detail-gallery__main-wrap {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.detail-gallery__main-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity 0.25s ease;
}

.detail-gallery__main-img.detail-gallery__main-img--loading {
  opacity: 0.5;
}

/* Thumbnail strip */
.detail-gallery__thumbs {
  display: flex;
  gap: var(--detail-thumb-gap);
  margin-top: 12px;
  overflow-x: auto;
  padding-bottom: 4px;  /* breathing room for scrollbar on mobile */
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--detail-border) transparent;
}

.detail-gallery__thumb {
  flex-shrink: 0;
  width: var(--detail-thumb-size);
  height: var(--detail-thumb-size);
  border-radius: 6px;
  border: 2px solid var(--detail-border);
  background: #f1f3f4;
  overflow: hidden;
  cursor: pointer;
  padding: 0;
  transition: border-color var(--detail-transition), box-shadow var(--detail-transition);
  outline: none;
}

.detail-gallery__thumb:hover {
  border-color: var(--detail-accent);
}

.detail-gallery__thumb--active {
  border-color: var(--detail-accent);
  box-shadow: 0 0 0 2px var(--detail-accent-light);
}

.detail-gallery__thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ── Product Info (right column on desktop) ──────────────── */
.detail-info {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.detail-info__category {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--detail-accent);
  margin-bottom: 8px;
}

.detail-info__title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--detail-text-primary);
  line-height: 1.25;
  margin: 0 0 12px;
  letter-spacing: -0.3px;
}

.detail-info__price-row {
  margin-bottom: 16px;
}

.detail-info__price {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--detail-price-color);
  letter-spacing: -0.4px;
}

.detail-info__divider {
  border: none;
  border-top: 1.5px solid var(--detail-border);
  margin: 0 0 20px;
}

/* Description & Condition sections */
.detail-info__section {
  margin-bottom: 20px;
}

.detail-info__section-title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--detail-text-muted);
  margin: 0 0 8px;
}

.detail-info__description {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--detail-text-secondary);
  margin: 0;
  white-space: pre-wrap; /* preserve line breaks if present */
}

/* Condition notes — subtle amber card */
.detail-info__section--condition {
  background: var(--detail-condition-bg);
  border: 1px solid var(--detail-condition-border);
  border-radius: 8px;
  padding: 12px 14px;
}

.detail-info__section--condition .detail-info__section-title {
  color: #b07a00;
}

.detail-info__condition {
  font-size: 0.84rem;
  line-height: 1.5;
  color: #6b5000;
  margin: 0;
}

/* Back link */
.detail-info__back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 0.84rem;
  color: var(--detail-accent);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--detail-transition);
}

.detail-info__back-link:hover {
  color: #1558b0;
  text-decoration: underline;
}

/* ── Related Products ────────────────────────────────────── */
.detail-related {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1.5px solid var(--detail-border);
}

.detail-related__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--detail-text-primary);
  margin: 0 0 18px;
  letter-spacing: -0.2px;
}

/* Related grid: 2 cols mobile, up to 4 desktop.
   Reuses .product-card from catalog.css — only layout here. */
.detail-related__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

/* The related cards are <a> tags wrapping .product-card —
   strip link default styling */
.detail-related__card {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

/* ══════════════════════════════════════════════════════════
   RESPONSIVE — Desktop layout
   ══════════════════════════════════════════════════════════ */

@media (min-width: 768px) {
  .detail-main {
    padding: 28px 24px 64px;
  }

  /* Hero becomes side-by-side */
  .detail-hero {
    flex-direction: row;
    gap: 40px;
    align-items: flex-start;
  }

  /* Gallery takes ~55% width */
  .detail-gallery {
    flex: 0 0 55%;
    max-width: 55%;
  }

  /* Info takes remaining */
  .detail-info {
    flex: 1;
    min-width: 0; /* prevent flex overflow */
  }

  .detail-info__title {
    font-size: 2rem;
  }

  .detail-info__price {
    font-size: 2.1rem;
  }

  /* Thumbs: wrap instead of scroll on wider screens */
  .detail-gallery__thumbs {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  /* Related: 3 columns */
  .detail-related__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .detail-main {
    padding: 36px 32px 72px;
  }

  .detail-hero {
    gap: 52px;
  }

  /* Thumb size bump on large screens */
  :root {
    --detail-thumb-size: 82px;
  }

  /* Related: 4 columns */
  .detail-related__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }
}

/* ══════════════════════════════════════════════════════════
   STEP 10 ADDITION — Add to Cart Button
   ══════════════════════════════════════════════════════════ */

.detail-info__atc-form {
  margin-top: 24px;
  margin-bottom: 8px;
}

.detail-info__atc-btn {
  display: block;
  width: 100%;
  padding: 14px 24px;
  background: var(--detail-accent);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.2px;
  transition: background var(--detail-transition), box-shadow var(--detail-transition), transform var(--detail-transition);
}

.detail-info__atc-btn:hover {
  background: #1558b0;
  box-shadow: 0 4px 12px rgba(26, 115, 232, 0.35);
}

.detail-info__atc-btn:active {
  transform: translateY(1px);
  box-shadow: 0 1px 4px rgba(26, 115, 232, 0.25);
}