:root {
  --ink: #1f2329;
  --muted: #646a73;
  --line: #e4e6eb;
  --paper: #ffffff;
  --accent: #128c4a;
  color-scheme: light;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.5 -apple-system, "PingFang HK", "Noto Sans HK", "Microsoft JhengHei", sans-serif; }
a { color: inherit; }
.product { max-width: 960px; margin: 0 auto; display: grid; gap: 24px; padding: 0 0 24px; }
.photo { width: 100%; aspect-ratio: 1; object-fit: contain; background: #f5f6f7; display: block; }
.info { padding: 0 16px; }
.brand { margin: 0; color: var(--muted); font-size: 13px; letter-spacing: .08em; }
h1 { margin: 4px 0 0; font-size: 24px; line-height: 1.3; }
.english { margin: 4px 0 0; color: var(--muted); }
dl { margin: 20px 0; display: grid; gap: 12px; }
dl div { display: grid; grid-template-columns: 4em 1fr; gap: 8px; }
dt { color: var(--muted); }
dd { margin: 0; }
.price { font-size: 20px; font-weight: 600; }
.sizes { display: flex; flex-wrap: wrap; gap: 6px; }
.sizes span { border: 1px solid var(--line); border-radius: 6px; padding: 0 8px; min-width: 2.5em; text-align: center; }
.whatsapp { display: block; text-align: center; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; padding: 14px; border-radius: 10px; }
.note { color: var(--muted); font-size: 13px; text-align: center; }
footer { text-align: center; padding: 8px 16px 32px; font-size: 14px; }
.catalog { max-width: 1080px; margin: 0 auto; padding: 16px; }
.catalog h1 { margin-bottom: 8px; }
.catalog h2 { font-size: 18px; margin: 28px 0 12px; border-bottom: 1px solid var(--line); padding-bottom: 6px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.tile { display: grid; gap: 4px; text-decoration: none; font-size: 14px; }
.tile img { width: 100%; aspect-ratio: 1; object-fit: contain; background: #f5f6f7; border-radius: 8px; }
.tile .price { color: var(--muted); }
@media (min-width: 760px) {
  .product { grid-template-columns: 1fr 1fr; padding: 32px 16px; align-items: start; }
  .photo { border-radius: 12px; }
}