:root {
  --primary: #1677ff;
  --primary-dark: #0e5ad6;
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2329;
  --muted: #6b7280;
  --border: #e6e9ef;
  --shadow: 0 2px 12px rgba(16, 24, 40, .06);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 16px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: #fff; border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 12px; height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; }
.brand-logo { width: 28px; height: 28px; border-radius: 6px; background: var(--primary); display: inline-block; }
.brand-name { color: var(--primary); letter-spacing: .5px; }
.main-nav { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.main-nav .nav-item { position: relative; }
.main-nav > .nav-item > a {
  display: block; padding: 8px 12px; border-radius: 6px; color: var(--text); font-size: 14px; white-space: nowrap;
}
.main-nav > .nav-item > a:hover { background: var(--bg); color: var(--primary); }
.main-nav .sub { display: none; position: absolute; top: 100%; left: 0; background: #fff; border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow); min-width: 160px; padding: 6px; }
.main-nav .nav-item:hover .sub { display: block; }
.main-nav .sub a { display: block; padding: 8px 10px; border-radius: 6px; font-size: 13px; }
.main-nav .sub a:hover { background: var(--bg); color: var(--primary); }
.nav-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--border); border-radius: 8px; font-size: 20px; width: 42px; height: 38px; cursor: pointer; }
.search { margin-left: auto; width: 200px; max-width: 38vw; padding: 8px 12px; border: 1px solid var(--border); border-radius: 999px; font-size: 13px; outline: none; }
.search:focus { border-color: var(--primary); }

/* Hero */
.hero { background: linear-gradient(135deg, #1677ff 0%, #0e5ad6 60%, #062a66 100%); color: #fff; padding: 48px 0; text-align: center; }
.hero h1 { margin: 0 0 12px; font-size: 30px; }
.hero p { margin: 0 0 20px; opacity: .92; }
.hero-cta { display: inline-block; background: #fff; color: var(--primary); padding: 10px 22px; border-radius: 999px; font-weight: 600; }
.hero-cta:hover { opacity: .9; }

/* Main / categories */
.cat-block { margin: 32px 0; }
.cat-title { font-size: 20px; font-weight: 700; margin: 0 0 14px; padding-left: 10px; border-left: 4px solid var(--primary); }
.sub-title { font-size: 15px; color: var(--muted); margin: 18px 0 10px; font-weight: 600; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; cursor: pointer; transition: transform .15s, box-shadow .15s; display: flex; flex-direction: column; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card .thumb { aspect-ratio: 4/3; background: #f0f2f5; overflow: hidden; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.card .body { padding: 12px; }
.card .title { font-size: 14px; font-weight: 600; margin: 0 0 6px; }
.card .price { color: #d4380d; font-size: 13px; font-weight: 600; }
.badge-featured { position: absolute; background: #fa8c16; color: #fff; font-size: 11px; padding: 2px 8px; border-radius: 0 0 8px 0; }

.loading { text-align: center; color: var(--muted); padding: 40px 0; }

/* Footer */
.site-footer { background: #11161d; color: #c9d1dc; margin-top: 40px; padding: 32px 0 16px; }
.footer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.footer-grid h4 { color: #fff; margin: 0 0 10px; font-size: 15px; }
.footer-grid p { margin: 4px 0; font-size: 13px; }
.footer-bottom { margin-top: 20px; padding-top: 14px; border-top: 1px solid #2a313c; font-size: 12px; color: #8a94a3; text-align: center; }

/* Modal */
.modal { position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal[hidden] { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.5); }
.modal-box { position: relative; background: #fff; border-radius: 14px; max-width: 760px; width: 100%; max-height: 90vh; overflow: auto; padding: 22px; }
.modal-close { position: absolute; right: 12px; top: 10px; background: none; border: none; font-size: 26px; cursor: pointer; color: var(--muted); }
.modal-imgs { display: flex; gap: 10px; flex-wrap: wrap; margin: 12px 0; }
.modal-imgs img { width: 120px; height: 120px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); cursor: zoom-in; }
.modal h2 { margin: 0 0 8px; font-size: 22px; }
.modal .specs { white-space: pre-wrap; background: var(--bg); border-radius: 8px; padding: 12px; font-size: 13px; }
.modal .desc { margin: 10px 0; color: #374151; }
.modal .price { color: #d4380d; font-weight: 700; font-size: 18px; }
.modal label { display: block; font-size: 13px; color: #475467; margin: 10px 0 4px; }
.modal input, .modal textarea { width: 100%; padding: 8px 10px; border: 1px solid #d0d5dd; border-radius: 8px; font-size: 14px; font-family: inherit; }
.modal .row { display: flex; gap: 12px; }
.modal .row > div { flex: 1; }

/* Buttons (前台复用) */
.btn { display: inline-block; padding: 8px 16px; border: 1px solid var(--primary); background: var(--primary); color: #fff; border-radius: 8px; cursor: pointer; font-size: 14px; text-align: center; }
.btn:hover { opacity: .9; }
.btn.ghost { background: transparent; color: var(--primary); }
.btn.lg { padding: 11px 26px; font-size: 15px; }
.btn.sm { padding: 5px 12px; font-size: 13px; }
.hero-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-cta.ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.7); }

/* 面包屑 / 标题 */
.crumbs { font-size: 13px; color: var(--muted); padding: 14px 0 6px; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--primary); }
.crumbs span { margin: 0 6px; }
.crumbs .cur { color: var(--text); }
.page-title { font-size: 22px; margin: 6px 0 10px; }
.page-title .cnt-lg { font-size: 13px; color: var(--muted); font-weight: 400; margin-left: 10px; }
.page-note { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
.page-body { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 22px; }
.page-img { width: 100%; max-width: 420px; border-radius: 10px; margin: 0 0 16px; }
.rich { line-height: 1.9; }
.rich p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.empty { text-align: center; color: var(--muted); padding: 30px 0; }

/* 子栏目块 / 数量标记 */
.sub-block { margin-bottom: 8px; }
.sub-title { font-size: 16px; font-weight: 600; margin: 20px 0 12px; display: flex; align-items: center; gap: 8px; }
.sub-title a { color: var(--text); }
.sub-title a:hover { color: var(--primary); }
.cnt { font-size: 12px; color: var(--muted); background: var(--bg); border-radius: 10px; padding: 1px 8px; font-weight: 400; }
.more { margin: 10px 0 24px; }
.more a { color: var(--primary); font-size: 13px; }

/* 分类切换 chip */
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.chip { background: #fff; border: 1px solid var(--border); border-radius: 999px; padding: 6px 14px; font-size: 13px; color: var(--text); }
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.on { background: var(--primary); border-color: var(--primary); color: #fff; }
.chip span { margin-left: 6px; opacity: .65; font-size: 12px; }

/* 产品详情 */
.detail { display: flex; gap: 26px; background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.detail-media { width: 46%; flex-shrink: 0; }
.main-img { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: #fafbfc; }
.main-img img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.thumbs { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.thumbs img { width: 62px; height: 62px; object-fit: cover; border-radius: 8px; border: 2px solid transparent; cursor: pointer; }
.thumbs img.on { border-color: var(--primary); }
.detail-info { flex: 1; min-width: 0; }
.detail-title { font-size: 22px; margin: 0 0 10px; }
.detail-price { color: #d4380d; font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.detail-cat { font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.detail-cat a { color: var(--primary); }
.detail-desc { color: #374151; margin-bottom: 14px; line-height: 1.8; }
.detail-specs h4 { margin: 0 0 8px; font-size: 14px; }
.detail-info .specs { white-space: pre-wrap; background: var(--bg); border-radius: 8px; padding: 12px; font-size: 13px; }
.detail-actions { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }

/* 资料下载 */
.doc-list { background: #fff; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.doc-row { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-bottom: 1px solid var(--border); }
.doc-row:last-child { border-bottom: none; }
.doc-icon { width: 42px; height: 42px; flex-shrink: 0; background: #fff1f0; color: #d4380d; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 700; }
.doc-main { flex: 1; min-width: 0; }
.doc-title { font-size: 14px; font-weight: 600; }
.doc-desc { font-size: 12px; color: var(--muted); margin-top: 2px; }
.doc-meta { font-size: 12px; color: #9aa3af; margin-top: 4px; }

/* 联系我们 */
.contact-wrap { display: flex; gap: 24px; align-items: flex-start; }
.contact-info, .contact-form { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 20px; flex: 1; min-width: 0; }
.contact-form h4 { margin: 0 0 12px; }
.contact-form label { display: block; font-size: 13px; color: #475467; margin: 10px 0 4px; }
.contact-form input, .contact-form textarea { width: 100%; padding: 8px 10px; border: 1px solid #d0d5dd; border-radius: 8px; font-size: 14px; font-family: inherit; }
.contact-form .row { display: flex; gap: 12px; }
.contact-form .row > div { flex: 1; }
.c-list { margin-top: 16px; border-top: 1px solid var(--border); padding-top: 12px; }
.c-row { display: flex; gap: 12px; font-size: 14px; padding: 5px 0; }
.c-row span { color: var(--muted); width: 62px; flex-shrink: 0; }

/* 卡片为链接 */
.card { color: inherit; text-decoration: none; }
.card .nopic { padding: 30px; text-align: center; color: #9aa3af; font-size: 13px; }

/* Responsive */
@media (max-width: 992px) { .grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) {
  .detail { flex-direction: column; }
  .detail-media { width: 100%; }
  .contact-wrap { flex-direction: column; }
  .page-title { font-size: 19px; }
  .doc-row { flex-wrap: wrap; }
}
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .main-nav { display: none; position: absolute; top: 60px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); flex-direction: column; padding: 8px; }
  .main-nav.open { display: flex; }
  .main-nav .sub { position: static; box-shadow: none; border: none; padding-left: 12px; display: none; }
  .main-nav .nav-item.expanded .sub { display: block; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 22px; }
}
@media (max-width: 480px) { .grid { grid-template-columns: repeat(2, 1fr); gap: 10px; } }