:root {
  --color-primary: #3E6AE1;
  --color-white: #FFFFFF;
  --color-light-ash: #F4F4F4;
  --color-carbon: #171A20;
  --color-graphite: #393C41;
  --color-pewter: #5C5E62;
  --color-silver-fog: #8E8E8E;
  --color-cloud: #EEEEEE;
  --rounded-btn: 4px;
  --rounded-card: 12px;
  --font-display: "Universal Sans Display", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --font-text: "Universal Sans Text", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --ease: 0.33s;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font-text);
  color: var(--color-graphite);
  background: var(--color-white);
  line-height: 1.43;
  font-size: 14px;
}
a { color: var(--color-pewter); text-decoration: none; }
a:hover { color: var(--color-carbon); }
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 16px; }

.header { padding: 12px 0; background: var(--color-white); }
.header-inner { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.logo {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--color-carbon);
  letter-spacing: 0.36em;
  text-transform: uppercase;
  font-size: 14px;
  text-decoration: none;
}
.search { flex: 1; min-width: 200px; display: flex; }
.search input {
  flex: 1;
  padding: 8px 0;
  border: 0;
  border-bottom: 1px solid var(--color-cloud);
  font: inherit;
  background: transparent;
}
.search button {
  padding: 4px 16px;
  min-height: 40px;
  border: 0;
  background: var(--color-primary);
  color: var(--color-white);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--rounded-btn);
  margin-left: 8px;
}
.links { display: flex; gap: 16px; font-size: 14px; }

.nav { background: var(--color-white); }
.nav-inner { display: flex; flex-wrap: wrap; gap: 4px 8px; padding: 8px 16px; justify-content: center; }
.nav a {
  color: var(--color-carbon);
  font-size: 14px;
  font-weight: 500;
  padding: 4px 16px;
  border-radius: var(--rounded-btn);
}
.nav a.on { background: var(--color-light-ash); }

.hero { padding: 0 0 24px; }
.ph {
  background: var(--color-light-ash);
  color: var(--color-silver-fog);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
}
.banner { height: 280px; background: #c8ccd0; color: var(--color-white); font-size: 22px; }

.section { padding: 32px 0; }
.section h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  color: var(--color-carbon);
  margin: 0 0 16px;
  text-align: center;
}

.cats { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.cats a {
  padding: 6px 12px;
  color: var(--color-carbon);
  font-size: 14px;
  font-weight: 500;
}

.products { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.item { color: var(--color-carbon); text-align: center; text-decoration: none; }
.item:hover { text-decoration: none; }
.item .ph { height: 140px; margin-bottom: 8px; background: var(--color-light-ash); }
.item h3 { margin: 0 0 4px; font-size: 17px; font-weight: 500; }
.price { color: var(--color-primary); font-weight: 500; }
.sub { color: var(--color-silver-fog); font-size: 12px; }

.layout { display: grid; grid-template-columns: 200px 1fr; gap: 24px; padding: 24px 0; }
.side a {
  display: block;
  padding: 8px 0;
  color: var(--color-carbon);
  border-bottom: 1px solid var(--color-cloud);
  font-size: 14px;
}
.side a.on { font-weight: 500; color: var(--color-primary); }

.detail { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding: 24px 0; }
.detail .ph { height: 320px; background: var(--color-light-ash); }
.detail h1 { font-family: var(--font-display); font-size: 40px; font-weight: 500; margin: 0 0 8px; color: var(--color-carbon); }
.sku { color: var(--color-pewter); margin-bottom: 12px; }
.spec { list-style: none; margin: 0 0 16px; padding: 0; }
.spec li { padding: 8px 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  width: 200px;
  padding: 4px 16px;
  border: 0;
  background: var(--color-primary);
  color: var(--color-white);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  margin-right: 8px;
  border-radius: var(--rounded-btn);
  text-decoration: none;
  transition: background-color var(--ease);
}
.btn:hover { background: #3459c4; color: var(--color-white); text-decoration: none; }
.btn-line { background: var(--color-white); color: var(--color-graphite); border: 1px solid var(--color-cloud); width: 160px; }
.btn-line:hover { color: var(--color-graphite); }

table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 8px; text-align: left; border-bottom: 1px solid var(--color-cloud); }
.qty { width: 48px; padding: 4px; border: 1px solid var(--color-cloud); }

.user-list { list-style: none; margin: 0; padding: 0; }
.user-list li { padding: 12px 0; border-bottom: 1px solid var(--color-cloud); }

.footer { padding: 40px 0; color: var(--color-pewter); font-size: 14px; text-align: center; }
.footer p { margin: 0 0 4px; }

@media (max-width: 800px) {
  .products { grid-template-columns: repeat(2, 1fr); }
  .layout, .detail { grid-template-columns: 1fr; }
  .detail h1 { font-size: 28px; }
}

.ph { overflow: hidden; }
.ph img { width: 100%; height: 100%; object-fit: cover; display: block; }