:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --border:#e5e7eb;
  --primary:#1d4ed8;
  --primary-2:#1e40af;
  --shadow:0 8px 30px rgba(17,24,39,.08);
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:var(--bg);
  color:var(--text);
}

a{color:inherit;text-decoration:none}
.container{width:100%;margin:0;padding:0 16px}

.topbar{
  position:sticky; top:0;
  background:rgba(255,255,255,.9);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
  z-index:50;
}
.topbar__row{display:flex;align-items:center;gap:16px;height:64px}
.topbar__row--first{justify-content:space-between;padding:0 16px}
.topbar__row--search{justify-content:center;padding:0 16px;background:linear-gradient(135deg,var(--primary),#22c55e);border-bottom:1px solid var(--border)}
.topbar__row--nav{justify-content:center;padding:0 16px;background:#fff}

.search--primary{max-width:800px;width:100%;gap:12px}
.search__input--primary{height:48px;border-radius:14px;font-size:16px}
.search__input--primary:focus{border-color:rgba(255,255,255,.8);box-shadow:0 0 0 4px rgba(255,255,255,.2)}

.topbar__row--search .btn--primary{height:48px;padding:0 20px;font-size:16px;border-radius:14px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand__logo{
  width:32px;height:32px;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),#22c55e);
  display:grid;place-items:center;color:#fff;
}
.brand__name{white-space:nowrap}

.search{flex:1;display:flex;align-items:center;gap:10px}
.search__input{
  width:100%;
  height:40px;
  padding:0 12px;
  border:1px solid var(--border);
  border-radius:12px;
  background:#fff;
  outline:none;
}
.search__input:focus{border-color:rgba(29,78,216,.5); box-shadow:0 0 0 4px rgba(29,78,216,.12)}

.topbar__nav{display:flex;align-items:center;gap:12px}
.navlink{
  padding:8px 10px;
  border-radius:10px;
  color:var(--muted);
  font-weight:600;
}
.navlink:hover{background:rgba(17,24,39,.04);color:var(--text)}

.topbar__right{display:flex;align-items:center;gap:12px}
.lang{display:flex;align-items:center;gap:8px}
.lang__label{font-size:12px;color:var(--muted)}
.pill{
  font-size:12px;
  padding:6px 10px;
  border:1px solid var(--border);
  border-radius:999px;
  background:#fff;
}
.pill--active{border-color:rgba(29,78,216,.35); background:rgba(29,78,216,.08)}

.btn{
  height:40px;
  padding:0 14px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:12px;
  border:1px solid var(--border);
  font-weight:700;
}
.btn--primary{border-color:transparent;background:var(--primary);color:#fff}
.btn--primary:hover{background:var(--primary-2)}
.btn--ghost{background:#fff}
.btn--ghost:hover{background:rgba(17,24,39,.03)}

.hero{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:16px;
  padding:20px 0;
}
.hero__left,.hero__right{min-width:0}
.hero__title{margin:18px 0 8px;font-size:32px;line-height:1.1}
.hero__subtitle{margin:0;color:var(--muted);max-width:56ch}
.hero__actions{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap}

.section{padding:14px 0 26px}
.section__head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:12px}
.section__title{margin:0;font-size:18px}
.section__hint{color:var(--muted);font-size:12px}

/* 面包屑导航样式 */
.breadcrumb{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--card);border-bottom:1px solid var(--border)}
.breadcrumb__item{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px;text-decoration:none;transition:color 0.3s ease}
.breadcrumb__item:hover{color:var(--primary)}
.breadcrumb__item:last-child{color:var(--text);font-weight:600;pointer-events:none}
.breadcrumb__separator{color:var(--muted);font-size:12px}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:16px;
  box-shadow:var(--shadow);
  overflow:hidden;
}
.card__title{padding:14px 14px 0;font-weight:800}
.card__body{padding:14px}
.muted{color:var(--muted)}

.grid{display:grid;gap:10px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--auto{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}

.tile{
  border:1px solid var(--border);
  border-radius:14px;
  padding:12px;
  background:#fff;
  display:flex;align-items:center;justify-content:space-between;
}
.tile:hover{border-color:rgba(29,78,216,.35); box-shadow:0 10px 30px rgba(29,78,216,.08)}
.tile__label{font-weight:800}
.tile__hint{color:var(--muted)}

.chip{
  background:#fff;
  border:1px solid var(--border);
  border-radius:14px;
  padding:12px;
  display:flex;align-items:center;justify-content:space-between;
}
.chip:hover{border-color:rgba(34,197,94,.4); box-shadow:0 10px 30px rgba(34,197,94,.08)}
.chip__name{font-weight:900}
.chip__meta{color:var(--muted);font-size:12px}

/* 分类标签样式 */
.category-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.category-tag{padding:8px 16px;border-radius:20px;background:var(--card);border:1px solid var(--border);font-size:14px;font-weight:600;cursor:pointer;transition:all 0.3s ease}
.category-tag:hover{border-color:var(--primary);background:rgba(29,78,216,0.05)}
.category-tag.active{border-color:var(--primary);background:var(--primary);color:#fff}

/* 产品卡片样式 */
.product-card{background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:16px;transition:all 0.3s ease}
.product-card:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(17,24,39,0.12)}
.product-card__title{font-size:16px;font-weight:800;margin-bottom:12px}
.product-card__category{font-size:14px;color:var(--muted);margin-bottom:12px}
.product-card__items{list-style:none;margin:0;padding:0}
.product-card__item{padding:8px 0;border-bottom:1px solid var(--border)}
.product-card__item:last-child{border-bottom:none}

/* 新的牌号卡片样式 */
.grade-card{background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);overflow:hidden;transition:all 0.3s ease;position:relative}
.grade-card:hover{transform:scale(1.05);box-shadow:0 16px 40px rgba(17,24,39,0.15);border-color:var(--primary)}
.grade-card__header{position:relative}
.grade-card__tag{position:absolute;top:12px;left:12px;background:var(--primary);color:#fff;padding:4px 12px;border-radius:8px;font-size:12px;font-weight:600;z-index:2}
.grade-card__image{width:100%;height:120px;background:linear-gradient(135deg,rgba(29,78,216,0.1),rgba(34,197,94,0.1));display:flex;align-items:center;justify-content:center;position:relative}
.grade-card__image::after{content:"图片占位";color:var(--muted);font-size:14px}
.grade-card__content{padding:16px;display:flex;flex-direction:column;min-height:240px}
.grade-card__name{font-size:18px;font-weight:800;margin-bottom:8px}
.grade-card__grade{position:absolute;top:16px;right:16px;background:#f0f0f0;color:var(--muted);padding:4px 12px;border-radius:8px;font-size:12px}
.grade-card__specs{font-size:13px;color:var(--text);margin-bottom:12px;line-height:1.4}
.grade-card__tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.grade-card__tag-item{background:#f0f0f0;color:var(--text);padding:4px 12px;border-radius:8px;font-size:12px}
.grade-card__status{font-size:13px;color:var(--muted);margin-bottom:16px}
.grade-card__datasheet-container{margin-top:auto;display:flex;justify-content:flex-end}
.grade-card__datasheet-btn{padding:8px 16px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-size:12px;font-weight:600;cursor:pointer;transition:all 0.3s ease;display:inline-flex;align-items:center;gap:6px;width:120px;height:36px;justify-content:center}
.grade-card__datasheet-btn:hover{background:var(--primary-2);transform:scale(1.05)}
.grade-card__datasheet-btn::before{content:"📄"}

/* 产品类目导航容器 */
.product-categories{margin-bottom:24px}
.product-categories__title{font-size:18px;font-weight:800;margin-bottom:16px}
.product-categories__nav{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:24px}

/* 空状态样式 */
.empty-state{text-align:center;padding:60px 20px}
.empty-state__icon{font-size:48px;margin-bottom:16px;color:var(--muted)}
.empty-state__title{font-size:18px;font-weight:700;margin-bottom:8px}
.empty-state__description{color:var(--muted);margin-bottom:24px}

.footer{
  border-top:1px solid var(--border);
  background:#fff;
  padding:18px 0;
}
.footer__row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.footer__muted{color:var(--muted);font-size:12px}
.footer__link{color:var(--muted)}
.footer__link:hover{color:var(--text)}
.footer__sep{margin:0 8px;color:var(--border)}

@media (max-width: 900px){
  .topbar__nav{display:none}
  .topbar__row--search{padding:0 12px}
  .search--primary{max-width:100%}
  .search__input--primary{font-size:14px}
  .topbar__row--search .btn--primary{font-size:14px;padding:0 16px}
  .hero{grid-template-columns:1fr}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width: 600px){
  .topbar__row{height:56px}
  .topbar__row--first{gap:12px}
  .brand__name{font-size:14px}
  .lang__label{display:none}
  .search__input--primary{height:40px}
  .topbar__row--search .btn--primary{height:40px}
}