:root {
  --primary: #0b5fff;
  --primary-dark: #0846b8;
  --ink: #16233b;
  --muted: #5b6b84;
  --line: #e3e9f2;
  --bg: #f5f8fc;
  --card: #ffffff;
  --radius: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; color: var(--ink); background: var(--bg); line-height: 1.6; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* header */
.site-header { background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 50; }
.header-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { width: 38px; height: 38px; border-radius: 10px; background: linear-gradient(135deg, var(--primary), #4d8bff); color: #fff; font-weight: 800; font-size: 22px; display: flex; align-items: center; justify-content: center; }
.logo-text b { font-size: 18px; display: block; line-height: 1.1; }
.logo-text small { color: var(--muted); font-size: 11px; }
.nav { display: flex; gap: 22px; margin-left: 12px; flex: 1; }
.nav a { color: var(--muted); font-size: 15px; padding: 4px 2px; border-bottom: 2px solid transparent; }
.nav a:hover { color: var(--primary); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-toggle { border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 6px 12px; font-weight: 600; color: var(--primary); }
.cart-btn { position: relative; border: none; background: var(--primary); color: #fff; border-radius: 8px; padding: 8px 16px; font-size: 14px; }
.cart-badge { background: #ff4d4f; color: #fff; border-radius: 10px; font-size: 11px; padding: 1px 7px; margin-left: 6px; vertical-align: 1px; }

/* hero */
.hero { background: linear-gradient(120deg, #0b1e3f 0%, #0b3f8f 55%, #0b5fff 100%); color: #fff; border-radius: 0 0 24px 24px; padding: 64px 0 56px; margin-bottom: 36px; }
.hero h1 { font-size: 34px; margin-bottom: 12px; }
.hero p { color: #c9dcff; font-size: 16px; max-width: 640px; margin-bottom: 26px; }
.hero .btns { display: flex; gap: 14px; }
.btn { display: inline-block; border: none; border-radius: 10px; padding: 11px 24px; font-size: 15px; font-weight: 600; }
.btn-primary { background: #fff; color: var(--primary-dark); }
.btn-ghost { background: rgba(255,255,255,.14); color: #fff; border: 1px solid rgba(255,255,255,.4); }
.btn-blue { background: var(--primary); color: #fff; }
.btn-outline { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

h2.sec { font-size: 24px; margin: 34px 0 18px; }
.trust { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: -30px 0 10px; }
.trust div { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; font-size: 14px; color: var(--muted); }
.trust b { display: block; color: var(--ink); font-size: 15px; margin-bottom: 2px; }

/* product grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: box-shadow .15s; display: flex; flex-direction: column; }
.card:hover { box-shadow: 0 8px 24px rgba(11,95,255,.10); }
.card .thumb { height: 160px; background: #eef3fb; display: flex; align-items: center; justify-content: center; }
.card .thumb img { max-height: 130px; max-width: 80%; }
.card .body { padding: 14px 16px 16px; flex: 1; display: flex; flex-direction: column; }
.card .sku { color: var(--muted); font-size: 12px; }
.card h3 { font-size: 16px; margin: 4px 0 8px; }
.card .price { margin-top: auto; display: flex; align-items: baseline; gap: 10px; }
.card .price b { color: #e0442a; font-size: 18px; }
.card .price span { color: var(--muted); font-size: 12px; }
.chip { display: inline-block; background: #eaf1ff; color: var(--primary); border-radius: 6px; font-size: 12px; padding: 1px 8px; margin-bottom: 6px; }
.tag-feat { background: #fff3e6; color: #d97a13; }

/* filter bar */
.filterbar { display: flex; flex-wrap: wrap; gap: 10px; margin: 8px 0 20px; align-items: center; }
.filterbar button { border: 1px solid var(--line); background: #fff; border-radius: 20px; padding: 6px 16px; font-size: 14px; color: var(--muted); }
.filterbar button.on { background: var(--primary); border-color: var(--primary); color: #fff; }
.filterbar input { flex: 1; min-width: 220px; border: 1px solid var(--line); border-radius: 10px; padding: 9px 14px; font-size: 14px; }

/* product detail */
.detail { display: grid; grid-template-columns: 420px 1fr; gap: 36px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.detail .thumb { background: #eef3fb; border-radius: 10px; display: flex; align-items: center; justify-content: center; min-height: 300px; }
.detail .thumb img { max-width: 85%; max-height: 280px; }
.detail h1 { font-size: 24px; margin: 6px 0 10px; }
.detail .big-price { font-size: 26px; color: #e0442a; font-weight: 700; margin: 10px 0; }
.spec-table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
.spec-table td { border: 1px solid var(--line); padding: 8px 12px; }
.spec-table td:first-child { background: #f7faff; width: 180px; color: var(--muted); }
.qty-row { display: flex; align-items: center; gap: 12px; margin: 16px 0; }
.qty-row input { width: 90px; border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; }
.btns-row { display: flex; gap: 12px; flex-wrap: wrap; }
.back { display: inline-block; margin: 18px 0 12px; color: var(--primary); font-size: 14px; }

/* forms */
.panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; margin: 20px 0; }
.panel h2 { font-size: 20px; margin-bottom: 16px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.field input, .field textarea, .field select { width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 9px 12px; font-size: 14px; font-family: inherit; }
.field textarea { min-height: 90px; resize: vertical; }

/* cart table */
.cart-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.cart-table th, .cart-table td { border-bottom: 1px solid var(--line); padding: 12px 8px; text-align: left; }
.cart-table th { color: var(--muted); font-weight: 500; font-size: 13px; }
.pay-options { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin: 12px 0; }
.pay-options label { border: 1.5px solid var(--line); border-radius: 10px; padding: 12px 14px; cursor: pointer; display: block; font-size: 14px; }
.pay-options label.on { border-color: var(--primary); background: #f0f5ff; }
.pay-options input { margin-right: 8px; }
.total-line { font-size: 18px; text-align: right; margin: 14px 0; }
.total-line b { color: #e0442a; font-size: 24px; }

/* steps / misc */
.steps { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.steps span { font-size: 13px; color: var(--muted); background: #eef3fb; border-radius: 20px; padding: 4px 14px; }
.steps span.on { background: var(--primary); color: #fff; }
.ok-box { text-align: center; padding: 50px 20px; }
.ok-box .big { font-size: 46px; margin-bottom: 12px; }
.empty { text-align: center; color: var(--muted); padding: 60px 0; }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.contact-grid .panel { margin: 0; }

/* footer */
.site-footer { background: #0d1b33; color: #9fb0c9; margin-top: 60px; padding: 40px 0 20px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1.4fr; gap: 30px; padding-bottom: 24px; }
.site-footer h4 { color: #fff; margin-bottom: 10px; font-size: 15px; }
.copyright { border-top: 1px solid #223453; padding-top: 16px; font-size: 12px; color: #6d7f9b; }

.toast { position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(80px); background: #16233b; color: #fff; padding: 11px 22px; border-radius: 10px; font-size: 14px; opacity: 0; transition: all .25s; z-index: 99; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* SEO:面包屑 + 卡片标题链接(真实 <a href> 便于搜索引擎抓取与权重传递) */
.crumbs { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13px; color: var(--muted); margin: 4px 0 16px; }
.crumbs a { color: var(--primary); }
.crumbs a:hover { text-decoration: underline; }
.crumbs span { color: var(--muted); }
a.card-title { display: block; }
a.card-title:hover h3 { color: var(--primary); }
a.thumb:hover img { transform: scale(1.03); }
a.thumb img { transition: transform .18s; }

@media (max-width: 860px) {
  .nav { display: none; }
  .trust { grid-template-columns: repeat(2, 1fr); }
  .detail { grid-template-columns: 1fr; }
  .form-grid, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}