/* =========================================================
   Template B (Modern) · Vercel/Linear 风
   白底 · 极轻边框 · 大留白 · 商品图主导
   ========================================================= */

*{ box-sizing:border-box; margin:0; padding:0; }

:root{
  --b-bg:        #ffffff;
  --b-canvas:    #fafbfc;
  --b-ink:       #111827;
  --b-ink-soft:  #4b5563;
  --b-muted:     #9ca3af;
  --b-line:      #e5e7eb;
  --b-line-soft: #f3f4f6;
  --b-radius:    10px;
  --b-radius-lg: 12px;
}

html,body{
  background: var(--b-canvas);
  color: var(--b-ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 14px; line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }
button{ font: inherit; cursor: pointer; }

/* ─── Header ─── */
.tnb-header{
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--b-line);
  position: sticky; top: 0; z-index: 100;
}
.tnb-header-inner{
  max-width: 1240px; margin: 0 auto;
  padding: 12px 28px;
  display: flex; align-items: center; gap: 24px;
}
.tnb-logo{
  font-size: 16px; font-weight: 700; color: var(--b-ink);
  letter-spacing: -.01em; flex-shrink: 0;
}
.tnb-logo span{ color: var(--b-accent); }

.tnb-search{
  flex: 1; max-width: 460px;
  display: flex; align-items: center; gap: 10px;
  background: var(--b-canvas);
  border: 1px solid var(--b-line);
  border-radius: var(--b-radius);
  padding: 8px 14px;
  transition: background .15s, border-color .15s;
}
.tnb-search:focus-within{ background:#fff; border-color: var(--b-ink); }
.tnb-search svg{ width:14px; height:14px; color: var(--b-muted); flex-shrink:0; }
.tnb-search input{
  flex: 1; background: transparent; border: 0; outline: none;
  font-size: 13px; color: var(--b-ink); min-width: 0;
}
.tnb-search input::placeholder{ color: var(--b-muted); }

.tnb-nav{
  margin-left: auto;
  display: flex; gap: 4px; align-items: center;
}
.tnb-nav a, .tnb-nav button.linklike{
  padding: 8px 12px; font-size: 13px; color: var(--b-ink-soft);
  border-radius: 6px; transition: background .15s, color .15s;
  background: transparent; border: 0;
}
.tnb-nav a:hover, .tnb-nav button.linklike:hover{
  background: var(--b-line-soft); color: var(--b-ink);
}
.tnb-nav .btn-primary{
  background: var(--b-ink); color: #fff;
  font-weight: 500;
}
.tnb-nav .btn-primary:hover{ background: var(--b-accent); color: #fff; }

/* ─── Hero ─── */
.tnb-hero{
  max-width: 1240px; margin: 0 auto;
  padding: 56px 28px 24px;
}
.tnb-hero h1{
  font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 700; letter-spacing: -.02em; line-height: 1.2;
  color: var(--b-ink); margin-bottom: 10px;
}
.tnb-hero p{
  font-size: 14px; color: var(--b-ink-soft);
  max-width: 580px;
}

/* ─── Tabs（分类胶囊）─── */
.tnb-tabs-wrap{
  max-width: 1240px; margin: 0 auto;
  padding: 12px 28px 0;
  border-bottom: 1px solid var(--b-line);
  position: sticky; top: 60px; z-index: 50;
  background: rgba(250,251,252,.94);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
}
.tnb-tabs{
  display: flex; gap: 4px;
  overflow-x: auto; padding-bottom: 12px;
  scrollbar-width: none;
}
.tnb-tabs::-webkit-scrollbar{ display: none; }
.tnb-tab{
  flex-shrink: 0;
  padding: 8px 14px; font-size: 13px; color: var(--b-ink-soft);
  border-radius: 999px; font-weight: 500;
  transition: background .15s, color .15s;
  white-space: nowrap;
  display: inline-flex; align-items: center; gap: 6px;
}
.tnb-tab:hover{ background: var(--b-line-soft); color: var(--b-ink); }
.tnb-tab.active{ background: var(--b-ink); color: #fff; }
.tnb-tab .count{
  font-size: 11px; color: var(--b-muted); font-weight: 400;
  padding: 1px 6px; background: var(--b-line-soft);
  border-radius: 999px;
}
.tnb-tab.active .count{ color: rgba(255,255,255,.7); background: rgba(255,255,255,.12); }

/* ─── Toolbar（排序/统计）─── */
.tnb-toolbar{
  max-width: 1240px; margin: 0 auto;
  padding: 18px 28px 0;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; color: var(--b-muted);
  flex-wrap: wrap; gap: 10px;
}
.tnb-toolbar .left{ display:flex; gap:8px; align-items:center; }
.tnb-toolbar .clear{ color: var(--b-accent); font-weight: 500; }
.tnb-toolbar select{
  border: 1px solid var(--b-line); background: #fff; padding: 6px 10px;
  border-radius: 6px; font-size: 12px; color: var(--b-ink); outline: none;
  cursor: pointer;
}

/* ─── Grid ─── */
.tnb-grid{
  max-width: 1240px; margin: 0 auto;
  padding: 18px 28px 32px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
}
@media (max-width: 1000px){ .tnb-grid{ grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 720px){ .tnb-grid{ grid-template-columns: repeat(2, 1fr); gap: 12px; } }

/* ─── Card ─── */
.tnb-card{
  display: flex; flex-direction: column;
  background: #fff;
  border: 1px solid var(--b-line);
  border-radius: var(--b-radius);
  overflow: hidden;
  transition: transform .18s cubic-bezier(.2,.7,.3,1),
              box-shadow .18s,
              border-color .18s;
}
.tnb-card:hover{
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(17,24,39,.07);
  border-color: var(--b-ink);
}
.tnb-card-media{
  aspect-ratio: 1;
  background: linear-gradient(135deg, #fafbfc 0%, #f3f4f6 100%);
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.tnb-card-media img{
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .35s cubic-bezier(.2,.7,.3,1);
}
.tnb-card:hover .tnb-card-media img{ transform: scale(1.04); }
.tnb-card-media .glyph{
  font-size: 56px; font-weight: 800; color: #d1d5db;
  letter-spacing: -.04em;
}
.tnb-card-flag{
  position: absolute; top: 10px; left: 10px;
  background: var(--b-ink); color: #fff;
  font-size: 10px; padding: 3px 8px; border-radius: 4px;
  font-weight: 500; letter-spacing: .02em;
}
.tnb-card-flag.flag-low{ background: #dc2626; }
.tnb-card-flag.flag-new{ background: var(--b-accent); }

.tnb-card-body{
  padding: 14px 16px 16px;
  flex: 1; display: flex; flex-direction: column; gap: 6px;
}
.tnb-card-cat{
  font-size: 10px; color: var(--b-muted);
  text-transform: uppercase; letter-spacing: .06em;
}
.tnb-card-name{
  font-size: 13px; line-height: 1.4;
  color: var(--b-ink); font-weight: 500;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.8em;
}
.tnb-card-foot{
  margin-top: auto;
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 8px; padding-top: 6px;
}
.tnb-card-price{
  font-size: 16px; font-weight: 700; color: var(--b-ink);
  letter-spacing: -.01em;
}
.tnb-card-price .cur{ font-size: 11px; color: var(--b-muted); margin-right: 2px; font-weight: 500; }
.tnb-card-stock{
  font-size: 11px; color: var(--b-muted);
}

/* ─── Empty ─── */
.tnb-empty{
  max-width: 1240px; margin: 0 auto;
  padding: 80px 28px; text-align: center; color: var(--b-muted);
}
.tnb-empty .glyph{ font-size: 42px; opacity: .35; margin-bottom: 14px; }
.tnb-empty .text{ font-size: 13px; margin-bottom: 12px; }
.tnb-empty a{ color: var(--b-accent); font-weight: 500; }

/* ─── Footer ─── */
.tnb-footer{
  border-top: 1px solid var(--b-line);
  margin-top: 32px;
  background: #fff;
}
.tnb-footer-inner{
  max-width: 1240px; margin: 0 auto;
  padding: 28px;
  display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
  font-size: 12px; color: var(--b-muted);
}
.tnb-footer a{
  color: var(--b-ink-soft); margin-right: 16px;
  transition: color .15s;
}
.tnb-footer a:hover{ color: var(--b-accent); }

/* ===========================================================
   Detail page
   =========================================================== */
.tnb-detail{
  max-width: 1240px; margin: 0 auto;
  padding: 28px;
}
.tnb-detail-crumbs{
  font-size: 12px; color: var(--b-muted);
  margin-bottom: 18px;
}
.tnb-detail-crumbs a{ color: var(--b-ink-soft); }
.tnb-detail-crumbs a:hover{ color: var(--b-accent); text-decoration: underline; }
.tnb-detail-crumbs span.sep{ margin: 0 8px; color: var(--b-muted); }
.tnb-detail-crumbs span.curr{ color: var(--b-ink); font-weight: 500; }

.tnb-detail-grid{
  display: grid; grid-template-columns: 260px 1fr; gap: 36px;
  align-items: start;
}
@media (max-width: 900px){
  .tnb-detail-grid{ grid-template-columns: 1fr; }
}

.tnb-detail-image{
  background: linear-gradient(135deg, #fafbfc 0%, #f3f4f6 100%);
  border: 1px solid var(--b-line); border-radius: var(--b-radius-lg);
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  overflow: hidden; position: relative;
}
.tnb-detail-image img{ width:100%; height:100%; object-fit: cover; }
.tnb-detail-image .glyph{ font-size: 100px; color: #d1d5db; font-weight: 800; letter-spacing:-.04em; }
.tnb-detail-flag{
  position: absolute; top: 14px; left: 14px;
  background: var(--b-ink); color: #fff;
  font-size: 11px; padding: 4px 10px; border-radius: 4px; font-weight: 500;
}
.tnb-detail-flag.flag-low{ background: #dc2626; }

.tnb-detail-info{ display: flex; flex-direction: column; gap: 14px; }
.tnb-detail-cat{
  font-size: 11px; color: var(--b-muted);
  text-transform: uppercase; letter-spacing: .06em;
}
.tnb-detail-info h1{
  font-size: 22px; font-weight: 700; line-height: 1.3;
  color: var(--b-ink);
}
.tnb-detail-rating{
  display: flex; gap: 10px; align-items: center;
  font-size: 12px; color: var(--b-muted);
}
.tnb-detail-rating .stars{ color: #f59e0b; font-size: 13px; }
.tnb-detail-rating strong{ color: var(--b-ink); font-weight: 600; }

.tnb-buy-card{
  background: #fff; border: 1px solid var(--b-line); border-radius: var(--b-radius-lg);
  padding: 20px; display: flex; flex-direction: column; gap: 14px;
}
.tnb-price-row{ display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.tnb-price-now{
  font-size: 32px; font-weight: 800; color: var(--b-ink);
  letter-spacing: -.02em; line-height: 1;
}
.tnb-price-now .cur{ font-size: 14px; color: var(--b-muted); margin-right: 3px; font-weight: 500; }
.tnb-price-ori{ font-size: 13px; color: var(--b-muted); text-decoration: line-through; }
.tnb-price-save{
  font-size: 11px; color: var(--b-accent); font-weight: 600;
  background: var(--b-line-soft); padding: 3px 8px; border-radius: 4px;
}

.tnb-qty-row{ display: flex; align-items: center; gap: 12px; }
.tnb-qty-row .lbl{ font-size: 12px; color: var(--b-muted); flex-shrink: 0; }
.tnb-qty{
  display: flex; border: 1px solid var(--b-line); border-radius: 6px; overflow: hidden;
}
.tnb-qty button{
  width: 32px; height: 36px; background: var(--b-canvas); border: 0;
  font-size: 14px; color: var(--b-ink-soft);
}
.tnb-qty button:hover{ background: var(--b-line-soft); color: var(--b-ink); }
.tnb-qty input{
  width: 50px; text-align: center; border: 0; outline: none;
  font-size: 13px; font-weight: 600;
  border-left: 1px solid var(--b-line); border-right: 1px solid var(--b-line);
}

.tnb-buy-total{
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 12px 0; border-top: 1px solid var(--b-line-soft);
  font-size: 12px; color: var(--b-muted);
}
.tnb-buy-total strong{
  font-size: 22px; font-weight: 800; color: var(--b-ink);
  letter-spacing: -.01em;
}
.tnb-buy-total strong .cur{ font-size: 12px; color: var(--b-muted); margin-right: 2px; font-weight: 500; }

.tnb-buy-btn{
  background: var(--b-ink); color: #fff; border: 0;
  padding: 12px; font-size: 14px; font-weight: 600;
  border-radius: 6px; transition: background .15s;
}
.tnb-buy-btn:hover{ background: var(--b-accent); }
.tnb-buy-btn--ghost{
  background: #fff; color: var(--b-ink); border: 1px solid var(--b-line);
}
.tnb-buy-btn--ghost:hover{ border-color: var(--b-ink); background: var(--b-canvas); }

.tnb-spec{
  background: var(--b-canvas); border: 1px solid var(--b-line);
  border-radius: 8px; padding: 14px 16px;
  display: grid; gap: 8px; font-size: 12px;
}
.tnb-spec-row{ display: flex; justify-content: space-between; gap: 12px; }
.tnb-spec-row .k{ color: var(--b-muted); }
.tnb-spec-row .v{ color: var(--b-ink); font-weight: 500; text-align: right; }

/* 描述区 */
.tnb-detail-section{
  margin-top: 32px;
  background: #fff; border: 1px solid var(--b-line); border-radius: var(--b-radius-lg);
  padding: 28px;
}
.tnb-detail-section h3{
  font-size: 15px; font-weight: 600; color: var(--b-ink);
  margin-bottom: 12px;
}
.tnb-detail-section p{
  font-size: 13px; color: var(--b-ink-soft); line-height: 1.7;
  margin-bottom: 12px;
}
.tnb-detail-section ul{
  list-style: none; padding: 0;
}
.tnb-detail-section li{
  position: relative; padding: 6px 0 6px 22px;
  font-size: 13px; color: var(--b-ink-soft);
}
.tnb-detail-section li::before{
  content: ''; position: absolute; left: 0; top: 13px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--b-accent);
}

.tnb-related-head{
  max-width: 1240px; margin: 32px auto 0;
  padding: 0 28px 12px;
  display: flex; justify-content: space-between; align-items: baseline;
}
.tnb-related-head h3{
  font-size: 16px; font-weight: 600; color: var(--b-ink);
}
.tnb-related-head .meta{
  font-size: 12px; color: var(--b-muted);
}

/* =========================================================
   Polish patch · 微动效 / focus 态 / 移动端
   ========================================================= */
::selection{ background: rgba(15,81,50,.16); color: var(--b-ink); }

button, a.tnb-buy-btn{
  -webkit-tap-highlight-color: transparent;
}
.tnb-search:focus-within,
.tnb-qty input:focus,
select:focus,
.tnb-buy-btn:focus-visible,
.tnb-tab:focus-visible{
  outline: 2px solid rgba(15,81,50,.35); outline-offset: 1px;
}

/* hover 上 card 时让分类/价格的颜色微微跃出 */
.tnb-card:hover .tnb-card-name{ color: var(--b-accent); }
.tnb-card{ will-change: transform; }

/* sticky tabs 阴影增加层次 */
.tnb-tabs-wrap{ box-shadow: 0 1px 0 rgba(0,0,0,.02); }

/* 移动端 ─ */
@media (max-width: 720px){
  .tnb-header-inner{ padding: 10px 16px; gap: 12px; }
  .tnb-search{ display: none; } /* 手机 header 隐藏搜索条，节省空间 */
  .tnb-nav{ gap: 2px; }
  .tnb-nav a, .tnb-nav button.linklike{ padding: 6px 10px; font-size: 12px; }
  .tnb-hero{ padding: 28px 16px 16px; }
  .tnb-hero h1{ font-size: 22px; }
  .tnb-hero p{ font-size: 13px; }
  .tnb-tabs-wrap{ padding: 10px 16px 0; top: 56px; }
  .tnb-toolbar{ padding: 14px 16px 0; }
  .tnb-grid{ padding: 14px 16px 24px; }
  .tnb-card-body{ padding: 12px 12px 14px; }
  .tnb-card-name{ font-size: 12px; min-height: 2.6em; }
  .tnb-card-price{ font-size: 14px; }

  .tnb-detail{ padding: 18px 16px; }
  .tnb-detail-info h1{ font-size: 18px; }
  .tnb-buy-card{ padding: 16px; }
  .tnb-price-now{ font-size: 26px; }
  .tnb-detail-section{ padding: 20px 16px; }
}
@media (max-width: 480px){
  .tnb-grid{ grid-template-columns: repeat(2, 1fr) !important; }
}