/* ================================================
   AYF v2 — Product Detail Page Styles
   Black-Gold Minimal · AYF 爱乐芬
   ================================================ */

.detail-main {
  display: flex;
  min-height: 100vh;
  padding-top: 100px;
  background: var(--absolute-black);
}

/* --- LEFT: Image --- */
.detail-image {
  flex: 1;
  position: sticky;
  top: 100px;
  height: calc(100vh - 140px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--deep-void);
  overflow: hidden;
}
.detail-image img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  transition: transform 0.6s ease;
}
.detail-image img:hover {
  transform: scale(1.03);
}

/* --- RIGHT: Info --- */
.detail-info {
  flex: 1;
  padding: var(--space-3xl) var(--space-2xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.detail-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ayf-gold);
  border: 1px solid var(--ayf-gold);
  padding: 4px 12px;
  margin-bottom: var(--space-lg);
  width: fit-content;
}
.detail-model {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 3.5rem);
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}
.detail-category {
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}
.detail-price {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2vw, 2rem);
  color: var(--ayf-gold);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.05em;
}
.detail-summary {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  max-width: 500px;
}

/* --- Tags --- */
.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}
.detail-tag {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 12px;
  border: 1px solid rgba(200, 164, 92, 0.3);
  color: var(--text-muted);
}

/* --- Actions --- */
.detail-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.detail-actions .btn-gold {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 16px 32px;
  background: var(--ayf-gold);
  color: var(--absolute-black);
  text-decoration: none;
  transition: all 0.4s ease;
}
.detail-actions .btn-gold:hover {
  background: var(--ayf-gold-dark);
  color: var(--text-primary);
}
.detail-actions .btn-outline {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 16px 32px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(245, 240, 232, 0.3);
  text-decoration: none;
  transition: all 0.4s ease;
}
.detail-actions .btn-outline:hover {
  border-color: var(--ayf-gold);
  color: var(--ayf-gold);
}

/* --- SPECS SECTION --- */
.detail-specs {
  background: var(--deep-void);
  border-top: 1px solid rgba(200, 164, 92, 0.1);
  padding: var(--space-4xl) var(--space-xl);
}
.specs-container {
  max-width: 960px;
  margin: 0 auto;
}
.specs-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  text-align: center;
  color: var(--text-primary);
  margin-bottom: var(--space-3xl);
}
.specs-grid {
  max-width: 720px;
  margin: 0 auto var(--space-3xl);
  border-top: 1px solid rgba(212, 168, 83, 0.12);
}
.spec-item {
  display: flex;
  padding: 14px 0;
  border-bottom: 1px solid rgba(245, 240, 232, 0.05);
  align-items: baseline;
  gap: var(--space-md);
}
.spec-label {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ayf-gold);
  min-width: 120px;
  flex-shrink: 0;
  opacity: 0.8;
}
.spec-value {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Pattern Guide --- */
.pattern-guide {
  max-width: 720px;
  margin: 0 auto var(--space-3xl);
  padding: var(--space-lg);
  border: 1px solid rgba(212, 168, 83, 0.1);
  background: rgba(212, 168, 83, 0.03);
}
.pattern-guide-title {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ayf-gold);
  margin-bottom: var(--space-sm);
}
.pattern-guide p {
  font-size: 0.82rem;
  line-height: 1.8;
  color: var(--text-muted);
  margin: 0;
}
.pattern-guide strong {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ================================================
   EXTENDED INFO — AYF Black-Gold Style
   ================================================ */

.detail-extended {
  margin: var(--space-3xl) 0;
  padding: 0;
}

/* --- Series Badge --- */
.ext-series {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(212, 168, 83, 0.2);
}
.ext-series-label {
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ayf-gold);
  border: 1px solid var(--ayf-gold);
  padding: 3px 8px;
  flex-shrink: 0;
}
.ext-series-name {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.8vw, 1.5rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--text-primary);
}

/* --- Highlights --- */
.ext-highlights {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-2xl);
  display: grid;
  gap: var(--space-sm);
}
.ext-highlights li {
  position: relative;
  padding-left: 20px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}
.ext-highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--ayf-gold);
}

/* --- Dividers --- */
.ext-divider {
  width: 40px;
  height: 1px;
  background: rgba(212, 168, 83, 0.3);
  margin: var(--space-2xl) 0;
}

/* --- Section --- */
.ext-section {
  margin-bottom: 0;
}
.ext-section-title {
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  flex-wrap: wrap;
}
.ext-section-en {
  font-family: var(--font-body);
  font-size: 0.55rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ayf-gold);
  opacity: 0.7;
}
.ext-section-body {
  font-size: 0.88rem;
  line-height: 1.9;
  color: var(--text-secondary);
  max-width: 680px;
}

/* --- Quality Grade --- */
.ext-grade-title {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--ayf-gold);
  margin-bottom: var(--space-md);
}
.ext-grade-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-xs);
}
.ext-grade-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-secondary);
}
.ext-grade-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background: rgba(212, 168, 83, 0.5);
}

/* --- Options --- */
.ext-options {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}
.ext-option {
  background: rgba(212, 168, 83, 0.04);
  border: 1px solid rgba(212, 168, 83, 0.12);
  padding: var(--space-lg);
  transition: border-color 0.3s ease, background 0.3s ease;
}
.ext-option:hover {
  border-color: rgba(212, 168, 83, 0.3);
  background: rgba(212, 168, 83, 0.06);
}
.option-name {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ayf-gold);
  margin-bottom: var(--space-xs);
}
.option-desc {
  display: block;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* --- Certificate & Case --- */
.ext-certificate,
.ext-case {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}
.ext-cert-icon,
.ext-case-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

/* --- Image Grid --- */
.detail-images-section {
  padding: 0 var(--space-2xl) var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}
.detail-images-section .ext-image-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  margin-top: var(--space-lg);
}
.ext-image-item {
  overflow: hidden;
  background: var(--deep-void);
  display: flex;
  align-items: center;
  justify-content: center;
}
.ext-image-item img {
  width: 100%;
  height: auto;
  display: block;
  opacity: 0.85;
  transition: opacity var(--transition-normal);
}
.ext-image-item img:hover {
  opacity: 1;
}
@media (max-width: 768px) {
  .ext-image-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.ext-certificate .ext-section-body,
.ext-case .ext-section-body {
  flex: 1;
}

/* --- Prev / Next Navigation --- */
.detail-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 960px;
  margin: 0 auto var(--space-xl);
}
.detail-nav a {
  font-family: var(--font-body);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.detail-nav a:hover {
  color: var(--ayf-gold);
}

.back-to-products {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--transition-fast);
  padding: var(--space-md) 0;
}
.back-to-products:hover {
  color: var(--ayf-gold);
}

/* --- Mobile: Stack Layout --- */
@media (max-width: 900px) {
  .detail-main {
    flex-direction: column;
    padding-top: 80px;
  }
  .detail-image {
    position: relative;
    top: auto;
    height: 50vh;
    min-height: 300px;
  }
  .detail-info {
    padding: var(--space-2xl) var(--space-md);
  }
  .detail-model {
    font-size: clamp(1.6rem, 5vw, 2.5rem);
  }
  .specs-grid {
    grid-template-columns: 1fr;
  }
  .spec-item {
    flex-direction: column;
    gap: var(--space-xs);
  }
  .spec-label {
    min-width: auto;
  }
  .ext-options {
    grid-template-columns: 1fr;
  }
  .ext-series {
    flex-direction: column;
    align-items: flex-start;
  }
  .ext-certificate,
  .ext-case {
    flex-direction: column;
    gap: var(--space-xs);
  }
}