/* ===== Detail Page Styles ===== */
:root {
  --primary: #2C5F7C;
  --primary-dark: #1A3D52;
  --accent: #6BA3BE;
  --danger: #D94D4D;
  --success: #2E8B57;
  --warning: #E8A838;
  --dark: #1a1a1a;
  --light: #fafafa;
  --white: #fff;
  --gray: #888;
  --gray-light: #e8e8e8;
  --shadow: 0 4px 20px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.12);
  --radius: 12px;
  --transition: all .35s cubic-bezier(.4,0,.2,1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif; background: var(--light); color: #333; line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Navigation */
.nav { background: #fff; padding: 0; position: sticky; top: 0; z-index: 999; box-shadow: 0 1px 8px rgba(0,0,0,.08); }
.nav-inner { max-width: 1200px; margin: auto; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; height: 58px; }
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: #1a1a1a; font-weight: 700; font-size: 16px; letter-spacing: .5px; }
.nav-logo img { height: 40px; }
.nav-logo span { color: var(--primary); }
.nav-links { display: flex; gap: 4px; }
.nav-links a { cursor: pointer; color: #555; text-decoration: none; font-size: 13px; padding: 6px 12px; border-radius: 4px; transition: var(--transition); font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); background: rgba(44,95,124,.1); }

/* Breadcrumb */
.breadcrumb { background: #fff; padding: 16px 0; border-bottom: 1px solid var(--gray-light); font-size: 13px; color: var(--gray); }
.breadcrumb a { color: var(--gray); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--dark); font-weight: 500; }
.breadcrumb > *:not(:last-child)::after { content: '/'; margin: 0 8px; color: var(--gray-light); }

/* Detail Hero - Enhanced */
.detail-hero { 
  padding: 48px 0 64px; 
  background: linear-gradient(180deg, #ffffff 0%, #f0f4f8 100%);
  border-bottom: 1px solid var(--gray-light);
}
.detail-hero-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: start; }

/* Gallery */
.detail-gallery { position: sticky; top: 90px; }
.main-image { 
  border-radius: var(--radius); 
  overflow: hidden; 
  box-shadow: var(--shadow-lg); 
  background: linear-gradient(135deg, #f5f7fa 0%, #e8edf2 100%);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
}
.main-image img { 
  width: 100%; 
  height: 100%; 
  object-fit: contain; 
  padding: 20px;
  transition: transform 0.3s ease;
}
.main-image:hover img { transform: scale(1.02); }

.image-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--gray);
  padding: 40px;
  text-align: center;
}
.image-placeholder svg { width: 64px; height: 64px; margin-bottom: 16px; opacity: 0.4; }
.image-placeholder p { font-size: 14px; font-weight: 500; }
.image-placeholder small { font-size: 12px; opacity: 0.7; margin-top: 8px; }

.thumbnails { display: flex; gap: 12px; margin-top: 16px; overflow-x: auto; padding-bottom: 8px; }
.thumbnails img { width: 80px; height: 80px; object-fit: cover; border-radius: 8px; cursor: pointer; opacity: 0.6; border: 2px solid transparent; transition: var(--transition); }
.thumbnails img:hover, .thumbnails img.active { opacity: 1; border-color: var(--primary); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(44,95,124,.2); }

/* Detail Info - Enhanced */
.detail-info { padding: 8px 0 0; }
.detail-badges { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.badge { 
  display: inline-flex; 
  align-items: center; 
  gap: 4px;
  padding: 6px 14px; 
  border-radius: 100px; 
  font-size: 11px; 
  font-weight: 700; 
  text-transform: uppercase; 
  letter-spacing: .5px;
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
}
.badge-new { background: linear-gradient(135deg, #e3f2fd, #bbdefb); color: #1565c0; }
.badge-hot { background: linear-gradient(135deg, #fff3e0, #ffe0b2); color: #e65100; }
.badge-electric { background: linear-gradient(135deg, #e8f5e9, #c8e6c9); color: #2e7d32; }
.badge-manual { background: linear-gradient(135deg, #f3e5f5, #e1bee7); color: #7b1fa2; }

.detail-title { 
  font-size: 36px; 
  font-weight: 800; 
  color: var(--dark); 
  line-height: 1.15; 
  margin-bottom: 6px; 
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--dark), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.detail-sku { 
  font-family: 'SF Mono', Monaco, monospace; 
  font-size: 14px; 
  color: var(--primary); 
  font-weight: 600;
  padding: 4px 12px;
  background: rgba(44,95,124,.1);
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 24px;
}
.detail-meta { 
  display: flex; 
  flex-wrap: wrap; 
  gap: 12px 20px; 
  margin-bottom: 24px; 
  font-size: 13px; 
  color: #555; 
  padding: 16px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--gray-light);
}
.detail-meta strong { color: var(--dark); }
.detail-meta .meta-item { display: flex; align-items: center; gap: 6px; }

.detail-description { 
  padding: 24px; 
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--gray-light);
  margin-bottom: 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,.03);
}
.detail-description h3 { 
  font-size: 14px; 
  font-weight: 700; 
  color: var(--dark); 
  margin-bottom: 10px; 
  text-transform: uppercase; 
  letter-spacing: .5px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.detail-description h3::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--primary);
  border-radius: 2px;
}
.detail-description p { color: #555; line-height: 1.8; font-size: 14px; }

.detail-features { margin-bottom: 24px; }
.detail-features h3 { 
  font-size: 14px; 
  font-weight: 700; 
  color: var(--dark); 
  margin-bottom: 12px; 
  text-transform: uppercase; 
  letter-spacing: .5px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.detail-features h3::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--success);
  border-radius: 2px;
}
.detail-features ul { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.detail-features li { 
  padding: 12px 16px; 
  background: #fff; 
  border-radius: 8px; 
  font-size: 13px; 
  color: #555; 
  display: flex; 
  align-items: center; 
  gap: 10px; 
  box-shadow: 0 2px 8px rgba(0,0,0,.04);
  border: 1px solid var(--gray-light);
  transition: var(--transition);
}
.detail-features li:hover { box-shadow: var(--shadow); border-color: var(--accent); transform: translateY(-1px); }
.detail-features li::before { 
  content: ''; 
  width: 8px; 
  height: 8px; 
  background: var(--success); 
  border-radius: 2px;
  flex-shrink: 0;
}

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 14px 28px; border-radius: 10px; font-size: 14px; font-weight: 600; border: none; cursor: pointer; transition: var(--transition); text-decoration: none; }
.btn-lg { padding: 18px 36px; font-size: 15px; }
.btn-primary { 
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)); 
  color: var(--white); 
  box-shadow: 0 4px 16px rgba(44,95,124,.3);
}
.btn-primary:hover { 
  background: linear-gradient(135deg, var(--primary-dark), #153a4d); 
  color: var(--white); 
  text-decoration: none; 
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(44,95,124,.4);
}
.btn-secondary { 
  background: var(--white); 
  color: var(--dark); 
  border: 1px solid var(--gray-light); 
}
.btn-secondary:hover { 
  background: var(--light); 
  border-color: var(--gray); 
  color: var(--dark); 
  text-decoration: none; 
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.detail-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; }

/* Specs Section */
.detail-specs { padding: 64px 0; background: #fff; }
.specs-tabs { 
  display: flex; 
  gap: 4px; 
  margin-bottom: 36px; 
  border-bottom: 2px solid var(--gray-light); 
  flex-wrap: wrap;
  padding-bottom: 4px;
}
.spec-tab { 
  padding: 14px 22px; 
  border: none; 
  background: transparent; 
  cursor: pointer; 
  font-size: 13px; 
  font-weight: 600; 
  color: var(--gray); 
  border-radius: 8px 8px 0 0; 
  margin-bottom: -2px; 
  transition: var(--transition); 
  position: relative; 
}
.spec-tab:hover { color: var(--dark); background: var(--light); }
.spec-tab.active { color: var(--primary); background: rgba(44,95,124,.1); }
.spec-tab.active::after { content: ''; position: absolute; bottom: -2px; left: 12px; right: 12px; height: 3px; background: var(--primary); border-radius: 3px 3px 0 0; }

.spec-panel { display: none; animation: fadeIn .3s ease; }
.spec-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.spec-panel h3 { 
  font-size: 18px; 
  font-weight: 700; 
  color: var(--dark); 
  margin-bottom: 24px; 
  padding-bottom: 14px; 
  border-bottom: 2px solid var(--gray-light);
  display: flex;
  align-items: center;
  gap: 10px;
}
.spec-panel h3::before {
  content: '';
  width: 4px;
  height: 22px;
  background: var(--primary);
  border-radius: 2px;
}

.spec-table-wrapper { overflow-x: auto; margin-bottom: 24px; border-radius: var(--radius); border: 1px solid var(--gray-light); }
.spec-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.spec-table th, .spec-table td { padding: 14px 18px; text-align: center; border: 1px solid var(--gray-light); }
.spec-table th { 
  background: linear-gradient(135deg, #fafbfc, #f0f4f8); 
  font-weight: 600; 
  color: #555; 
  text-transform: uppercase; 
  letter-spacing: .5px; 
  font-size: 11px; 
}
.spec-table tbody tr:hover { background: linear-gradient(135deg, #fafbfc, #f5f7fa); }
.spec-table td:first-child { text-align: left; font-weight: 600; color: var(--dark); }
.spec-table td { color: #555; }
.spec-table td:empty { color: var(--gray); }

.spec-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 24px; }
.spec-card { 
  background: #fff; 
  border: 1px solid var(--gray-light); 
  border-radius: var(--radius); 
  padding: 20px; 
  transition: var(--transition); 
  position: relative;
  overflow: hidden;
}
.spec-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gray-light);
}
.spec-card:hover { box-shadow: var(--shadow); border-color: var(--accent); transform: translateY(-2px); }
.spec-card::before { background: var(--primary); }
.spec-card h4 { font-size: 11px; font-weight: 700; color: var(--gray); text-transform: uppercase; letter-spacing: .8px; margin-bottom: 10px; }
.spec-card p { font-size: 15px; color: var(--dark); font-weight: 500; line-height: 1.5; word-break: break-word; }

.spec-subsection { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--gray-light); }
.spec-subsection h4 { font-size: 14px; font-weight: 700; color: var(--dark); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.spec-subsection h4::before { content: ''; width: 4px; height: 18px; background: var(--accent); border-radius: 2px; }

.functions-grid { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

.spec-highlight { 
  padding: 18px 24px; 
  background: linear-gradient(135deg, rgba(44,95,124,.08), rgba(107,163,190,.08)); 
  border-radius: 10px; 
  font-size: 14px; 
  color: var(--primary); 
  font-weight: 600; 
  border-left: 4px solid var(--primary);
}
.spec-note { font-size: 13px; color: #555; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--gray-light); }
.spec-note strong { color: var(--dark); }
.text-center { text-align: center; color: var(--gray); }

/* Related Products */
.related-products { padding: 64px 0; background: var(--light); }
.related-products h2 { 
  text-align: center; 
  font-size: 26px; 
  font-weight: 800; 
  color: var(--dark); 
  margin-bottom: 36px;
  position: relative;
}
.related-products h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  margin: 12px auto 0;
  border-radius: 2px;
}
.related-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.related-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); text-decoration: none; color: inherit; }
.related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); text-decoration: none; }
.related-card img { width: 100%; height: 180px; object-fit: contain; background: #fafafa; padding: 16px; transition: transform 0.3s ease; }
.related-card:hover img { transform: scale(1.05); }
.related-name { padding: 14px 16px 4px; font-weight: 600; font-size: 14px; color: var(--dark); }
.related-spec { padding: 0 16px 14px; font-size: 12px; color: var(--gray); }

/* Footer */
.footer { background: var(--dark); color: #fff; padding: 48px 20px 0; }
.footer-grid { max-width: 1200px; margin: auto; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.footer-logo { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.footer-logo span { color: var(--accent); }
.footer-col > p { color: rgba(255,255,255,.55); font-size: 13px; line-height: 1.7; }
.footer-col h4 { font-size: 13px; margin-bottom: 14px; color: #fff; font-weight: 700; letter-spacing: .8px; text-transform: uppercase; }
.footer-col a { display: block; color: rgba(255,255,255,.6); font-size: 13px; padding: 4px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--accent); text-decoration: none; }
.footer-bottom { max-width: 1200px; margin: 32px auto 0; padding: 20px 20px 0; border-top: 1px solid rgba(255,255,255,.1); text-align: center; font-size: 12px; color: rgba(255,255,255,.4); }

/* Responsive */
@media (max-width: 1024px) {
  .detail-hero-grid { grid-template-columns: 1fr; }
  .detail-gallery { position: static; max-width: 700px; margin: 0 auto 36px; }
  .specs-tabs { justify-content: flex-start; overflow-x: auto; padding-bottom: 8px; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; text-align: center; }
  .footer-col a { display: inline-block; margin: 0 8px; }
  .detail-title { font-size: 30px; }
}
@media (max-width: 768px) {
  .detail-title { font-size: 26px; }
  .detail-meta { flex-direction: column; gap: 8px; }
  .detail-actions { flex-direction: column; }
  .btn { width: 100%; }
  .spec-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .detail-hero { padding: 32px 0 48px; }
  .detail-hero-grid { gap: 32px; }
}