/* ============ Reset & Base ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #f9f8f6;
  --color-surface: #ffffff;
  --color-text: #2c2c2c;
  --color-text-secondary: #6b6b6b;
  --color-accent: #8b7355;
  --color-accent-hover: #6b5840;
  --color-border: #e6e2dc;
  --color-shadow: rgba(0,0,0,0.06);
  --radius: 10px;
  --radius-sm: 6px;
  --max-width: 1280px;
  --header-height: 64px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; font-family: inherit; }

/* ============ Header ============ */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 1.25rem; font-weight: 700;
  letter-spacing: -0.5px;
}

.logo-icon { color: var(--color-accent); font-size: 1.4rem; }

.nav { display: flex; gap: 4px; }
.nav a {
  padding: 6px 14px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 500;
  transition: all 0.2s; white-space: nowrap;
}
.nav a:hover { background: var(--color-bg); color: var(--color-accent); }
.nav a.active { background: var(--color-accent); color: #fff; }

.header-actions { display: flex; align-items: center; }

.lang-toggle {
  display: flex; align-items: center; gap: 2px;
  padding: 6px 12px; border-radius: 20px;
  background: var(--color-bg); border: 1px solid var(--color-border);
  font-size: 0.8rem; font-weight: 600;
  transition: all 0.2s;
}
.lang-toggle:hover { border-color: var(--color-accent); }
.lang-toggle .lang-divider { color: var(--color-border); font-weight: 300; }
.lang-toggle[data-lang="zh"] .lang-zh { color: var(--color-accent); }
.lang-toggle[data-lang="zh"] .lang-en { color: var(--color-text-secondary); }
.lang-toggle[data-lang="en"] .lang-en { color: var(--color-accent); }
.lang-toggle[data-lang="en"] .lang-zh { color: var(--color-text-secondary); }

/* ============ Main ============ */
main { flex: 1; max-width: var(--max-width); margin: 0 auto; padding: 32px 24px; width: 100%; }

/* ============ Hero ============ */
.hero {
  text-align: center; padding: 48px 24px 32px;
}
.hero h1 { font-size: 2.2rem; font-weight: 700; letter-spacing: -1px; margin-bottom: 8px; }
.hero p { color: var(--color-text-secondary); font-size: 1.05rem; }

/* ============ Categories Grid ============ */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  padding: 8px 0 48px;
}

.category-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 12px var(--color-shadow);
  transition: transform 0.25s, box-shadow 0.25s;
  display: flex; flex-direction: column;
}
.category-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}

.category-card-header {
  padding: 28px 24px 18px;
  border-bottom: 1px solid var(--color-border);
}

.category-card-header h3 {
  font-size: 1.2rem; font-weight: 600;
  margin-bottom: 4px;
}

.category-card-header .count {
  font-size: 0.85rem; color: var(--color-text-secondary);
}

.category-card-preview {
  height: 200px; overflow: hidden; position: relative;
  background: var(--color-bg);
  display: flex; align-items: center; justify-content: center;
}
.category-card-preview img {
  width: 100%; height: 100%; object-fit: cover;
}
.category-card-preview .placeholder {
  color: var(--color-border); font-size: 3rem;
}

.category-card-footer {
  padding: 14px 24px;
  border-top: 1px solid var(--color-border);
}
.category-card-footer .view-more {
  color: var(--color-accent); font-weight: 600; font-size: 0.9rem;
}
.category-card:hover .view-more { color: var(--color-accent-hover); }

/* ============ Page Header ============ */
.page-header {
  margin-bottom: 32px;
}
.page-header h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 4px; }
.page-header p { color: var(--color-text-secondary); font-size: 0.9rem; }

.back-link {
  display: inline-block; margin-bottom: 16px;
  color: var(--color-accent); font-weight: 500; font-size: 0.9rem;
  transition: color 0.2s;
}
.back-link:hover { color: var(--color-accent-hover); }

/* ============ Products Grid ============ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  padding-bottom: 48px;
}

.product-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 10px var(--color-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}
.product-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.1);
}

.product-card-image {
  height: 200px; overflow: hidden;
  background: var(--color-bg);
  display: flex; align-items: center; justify-content: center;
}
.product-card-image img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.3s;
}
.product-card:hover .product-card-image img { transform: scale(1.05); }

.product-card-body {
  padding: 14px 16px;
}
.product-card-body .product-code {
  font-size: 0.75rem; font-weight: 700; color: var(--color-accent);
  letter-spacing: 0.5px; margin-bottom: 4px;
}
.product-card-body .product-name {
  font-size: 0.85rem; font-weight: 500;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; line-height: 1.3;
}

/* ============ Product Detail ============ */
.detail-container { max-width: 960px; margin: 0 auto; }

.detail-main {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 40px;
  align-items: start;
}

.detail-image-wrapper {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--color-shadow);
}
.detail-image-wrapper img {
  width: 100%; height: auto; display: block;
}

.detail-info {
  position: sticky; top: calc(var(--header-height) + 32px);
}

.detail-code {
  display: inline-block; padding: 4px 12px;
  background: var(--color-accent); color: #fff;
  border-radius: 20px; font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.5px; margin-bottom: 12px;
}

.detail-name {
  font-size: 1.5rem; font-weight: 700; margin-bottom: 8px;
  line-height: 1.3;
}

.detail-spec {
  display: block; color: var(--color-text-secondary);
  font-size: 0.95rem; margin-bottom: 16px;
}

.detail-category-label {
  display: inline-block; padding: 4px 12px;
  background: var(--color-bg); border-radius: var(--radius-sm);
  color: var(--color-text-secondary); font-size: 0.8rem;
  margin-bottom: 24px;
}

.detail-nav {
  display: flex; gap: 12px;
}

.nav-btn {
  flex: 1; padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: 0.85rem; font-weight: 600;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all 0.2s;
}
.nav-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============ Footer ============ */
.footer {
  text-align: center; padding: 32px 24px;
  color: var(--color-text-secondary); font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

/* ============ Responsive ============ */
@media (max-width: 768px) {
  .header-inner { padding: 0 16px; }
  .nav { display: none; } /* Hidden on mobile, simplified nav */
  .logo-text { font-size: 1rem; }

  .hero { padding: 32px 16px 24px; }
  .hero h1 { font-size: 1.6rem; }

  .categories-grid { grid-template-columns: 1fr; gap: 16px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }

  .detail-main { grid-template-columns: 1fr; gap: 24px; }
  .detail-info { position: static; }
  .detail-name { font-size: 1.2rem; }
}

@media (max-width: 480px) {
  main { padding: 20px 12px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .product-card-image { height: 150px; }
}