:root{
  --navy:#14233a; --navy2:#1d3354;
  --line:#e6eaf0; --line2:#eef1f6;
  --bg:#f5f7fa; --card:#ffffff;
  --txt:#1f2937; --muted:#6b7686; --muted2:#9aa4b2;
  --accent:#e4002b;            /* NB red */
  --casual:#0f9d8e; --casual-bg:#e7f7f4;
  --sport:#f2681c;  --sport-bg:#fdeee0;
  --blue:#2563eb;
  --shadow:0 1px 3px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.06);
  --radius:14px;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--txt); background:var(--bg); font-size:14px; line-height:1.5;
}
button{font-family:inherit;cursor:pointer}
a{color:inherit;text-decoration:none}

/* ---------- Top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:18px;
  padding:0 18px;height:60px;background:var(--navy);color:#fff;
  box-shadow:0 2px 10px rgba(0,0,0,.15);
}
.brand{display:flex;align-items:center;gap:9px;cursor:pointer;user-select:none}
.brand-mark{background:var(--accent);color:#fff;font-weight:800;padding:4px 8px;border-radius:8px;letter-spacing:.5px;font-size:15px}
.brand-text{font-weight:600;font-size:16px;white-space:nowrap}
.search-wrap{position:relative;flex:1;max-width:560px;margin:0 auto;display:flex}
#searchInput{
  flex:1;height:38px;border:0;border-radius:10px 0 0 10px;padding:0 14px;font-size:14px;outline:none;background:#fff;color:var(--txt)
}
.search-btn{height:38px;border:0;border-radius:0 10px 10px 0;background:var(--accent);color:#fff;padding:0 18px;font-weight:600}
.search-btn:hover{filter:brightness(1.08)}
.top-actions{display:flex;gap:10px;align-items:center}
.ghost-btn{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.2);height:38px;padding:0 14px;border-radius:10px;font-weight:600;display:flex;align-items:center;gap:6px}
.ghost-btn:hover{background:rgba(255,255,255,.2)}
.badge{background:var(--accent);color:#fff;border-radius:20px;min-width:20px;height:20px;display:inline-flex;align-items:center;justify-content:center;font-size:12px;padding:0 6px}

.search-dropdown{
  position:absolute;top:46px;left:0;right:0;background:#fff;color:var(--txt);
  border-radius:12px;box-shadow:var(--shadow);overflow:hidden;display:none;max-height:60vh;overflow-y:auto
}
.search-dropdown.show{display:block}
.sd-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-bottom:1px solid var(--line2);cursor:pointer}
.sd-item:hover{background:var(--line2)}
.sd-thumb{width:40px;height:40px;border-radius:8px;object-fit:cover;background:var(--line2)}
.sd-meta{display:flex;flex-direction:column}
.sd-model{font-weight:700}
.sd-sub{color:var(--muted);font-size:12px}
.sd-cat{margin-left:auto;font-size:11px;color:#fff;padding:2px 8px;border-radius:20px}
.sd-more{padding:10px;text-align:center;color:var(--blue);font-weight:600;cursor:pointer}

/* ---------- Layout ---------- */
.layout{display:flex;align-items:flex-start;min-height:calc(100vh - 60px)}
.sidebar{
  width:280px;flex:0 0 280px;position:sticky;top:60px;height:calc(100vh - 60px);
  overflow-y:auto;background:#fff;border-right:1px solid var(--line);padding:16px 14px
}
.content{flex:1;padding:20px 24px;min-width:0}

/* ---------- Sidebar ---------- */
.cat-switch{display:flex;gap:8px;margin-bottom:14px}
.cat-pill{flex:1;text-align:center;padding:9px 6px;border-radius:10px;border:1px solid var(--line);background:#fff;font-weight:600;color:var(--muted)}
.cat-pill.active{color:#fff;border-color:transparent}
.cat-pill.casual.active{background:var(--casual)}
.cat-pill.sport.active{background:var(--sport)}

.facet{border-top:1px solid var(--line2);padding:12px 0}
.facet-head{display:flex;align-items:center;justify-content:space-between;cursor:pointer;font-weight:700;font-size:13px;color:var(--navy)}
.facet-head .chev{color:var(--muted2);transition:transform .15s}
.facet.collapsed .chev{transform:rotate(-90deg)}
.facet-body{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.facet.collapsed .facet-body{display:none}
.chip{padding:5px 10px;border:1px solid var(--line);border-radius:20px;background:#fff;color:var(--muted);font-size:12px;display:inline-flex;align-items:center;gap:5px}
.chip:hover{border-color:var(--blue);color:var(--blue)}
.chip.active{background:var(--navy);color:#fff;border-color:var(--navy)}
.chip .c{font-size:11px;opacity:.7}

.series-title{font-weight:700;font-size:13px;color:var(--navy);margin:14px 0 8px;display:flex;justify-content:space-between;align-items:center}
.series-list{display:flex;flex-direction:column;gap:2px;max-height:300px;overflow-y:auto}
.series-item{display:flex;justify-content:space-between;align-items:center;padding:7px 9px;border-radius:8px;cursor:pointer;color:var(--txt)}
.series-item:hover{background:var(--line2)}
.series-item .sc{color:var(--muted2);font-size:12px}
.series-search{width:100%;height:30px;border:1px solid var(--line);border-radius:8px;padding:0 9px;margin-bottom:8px;font-size:12px;outline:none}

.reset-btn{margin-top:14px;width:100%;height:36px;border:1px solid var(--line);background:#fff;border-radius:10px;color:var(--muted);font-weight:600}
.reset-btn:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- Content / headers ---------- */
.page-title{display:flex;align-items:baseline;gap:12px;margin:0 0 4px}
.page-title h1{font-size:22px;margin:0}
.page-sub{color:var(--muted);margin:0 0 16px}
.crumbs{color:var(--muted);font-size:13px;margin-bottom:14px}
.crumbs a{color:var(--blue)}
.crumbs a:hover{text-decoration:underline}

.toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.count-pill{background:var(--line2);color:var(--muted);padding:6px 12px;border-radius:20px;font-weight:600}

/* ---------- Home ---------- */
.home-hero{padding:26px;border-radius:var(--radius);background:linear-gradient(120deg,var(--navy),var(--navy2));color:#fff;margin-bottom:22px}
.home-hero h1{margin:0 0 6px;font-size:26px}
.home-hero p{margin:0;color:#c4d0e0;opacity:.9}
.cat-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-bottom:24px}
.cat-card{border-radius:var(--radius);padding:22px;color:#fff;cursor:pointer;box-shadow:var(--shadow);transition:transform .12s}
.cat-card:hover{transform:translateY(-3px)}
.cat-card.casual{background:linear-gradient(135deg,var(--casual),#0c7d72)}
.cat-card.sport{background:linear-gradient(135deg,var(--sport),#d4550f)}
.cat-card h2{margin:0 0 4px;font-size:22px}
.cat-card .num{font-size:34px;font-weight:800;margin-top:10px}
.cat-card .desc{opacity:.9;font-size:13px;margin-top:2px}
.home-section h3{margin:0 0 12px;font-size:16px}
.model-chips{display:flex;flex-wrap:wrap;gap:8px}
.model-chip{padding:7px 13px;border-radius:10px;background:#fff;border:1px solid var(--line);cursor:pointer;font-weight:600;box-shadow:var(--shadow)}
.model-chip:hover{border-color:var(--blue);color:var(--blue)}

/* ---------- Product grid ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:transform .12s,box-shadow .12s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card-img{position:relative;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover}
.cmp{position:absolute;left:8px;top:8px;background:rgba(255,255,255,.92);border-radius:8px;padding:3px 8px;font-size:12px;display:flex;align-items:center;gap:5px;box-shadow:0 1px 4px rgba(0,0,0,.12)}
.card-body{padding:11px 12px}
.card-model{font-weight:800;font-size:15px}
.card-sku{color:var(--muted);font-size:12px;margin-top:1px}
.card-tags{margin-top:8px;display:flex;flex-wrap:wrap;gap:5px}
.tag{background:var(--line2);color:var(--muted);font-size:11px;padding:2px 7px;border-radius:6px}
.tag.mall{background:#fff4e5;color:#c5740a}
.tag.year{background:#eef2ff;color:#3b5bdb}

.load-more{margin:24px auto 0;display:block;height:42px;padding:0 28px;border:1px solid var(--line);background:#fff;border-radius:12px;font-weight:700;color:var(--navy)}
.load-more:hover{border-color:var(--blue);color:var(--blue)}
.empty{padding:60px;text-align:center;color:var(--muted)}

/* ---------- Detail ---------- */
.detail{display:grid;grid-template-columns:minmax(280px,420px)1fr;gap:28px}
.detail-img-wrap{position:sticky;top:80px;align-self:start}
.detail-img{width:100%;border-radius:var(--radius);border:1px solid var(--line);background:#fff;aspect-ratio:4/3;object-fit:cover;cursor:zoom-in}
.detail-actions{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}
.btn{border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 14px;font-weight:600;color:var(--navy)}
.btn:hover{border-color:var(--blue);color:var(--blue)}
.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn.primary:hover{filter:brightness(1.08);color:#fff}
.spec-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.spec-table th,.spec-table td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line2);vertical-align:top}
.spec-table th{width:160px;background:var(--line2);color:var(--muted);font-weight:600;white-space:nowrap}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:0}
.detail-title{font-size:26px;font-weight:800;margin:0}
.detail-sub{color:var(--muted);margin:2px 0 14px}

.same-series{margin-top:30px}
.same-series h3{margin:0 0 12px;font-size:16px}

/* ---------- Compare ---------- */
.cmp-table-wrap{overflow-x:auto}
.cmp-table{border-collapse:collapse;width:100%;min-width:600px}
.cmp-table th,.cmp-table td{border:1px solid var(--line);padding:10px 12px;vertical-align:top;background:#fff}
.cmp-table thead th{background:var(--navy);color:#fff;position:sticky;top:0}
.cmp-table .attr-col{background:var(--line2);color:var(--muted);font-weight:600;white-space:nowrap;width:150px}
.cmp-table td.diff{background:#fff7e6;font-weight:600}
.cmp-thumb{width:100%;height:120px;object-fit:cover;border-radius:8px;background:var(--line2)}
.cmp-remove{margin-top:8px;color:var(--accent);font-size:12px;cursor:pointer}
.cmp-empty{padding:60px;text-align:center;color:var(--muted)}

/* ---------- Modal / toast ---------- */
.modal{position:fixed;inset:0;background:rgba(15,23,42,.5);display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}
.modal.hidden{display:none}
.modal-box{background:#fff;border-radius:16px;max-width:640px;width:100%;max-height:84vh;overflow-y:auto;padding:26px;position:relative}
.modal-close{position:absolute;right:14px;top:12px;border:0;background:none;font-size:26px;color:var(--muted);line-height:1}
.modal-box h2{margin:0 0 12px}
.modal-box ul{padding-left:20px}
.modal-box li{margin:6px 0}
.modal-box code{background:var(--line2);padding:1px 6px;border-radius:5px;font-size:13px}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--navy);color:#fff;padding:11px 18px;border-radius:10px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:200;font-weight:600}
.toast.show{opacity:1}

.nosales-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
.ns-card{border:1px solid var(--line);border-radius:12px;padding:14px;background:#fff;display:flex;flex-direction:column;gap:8px}
.ns-code{font-weight:700;font-size:15px;word-break:break-all}

/* ---------- 客服话术框 ---------- */
.script-box{display:flex;gap:12px;align-items:flex-start;margin:14px 0 18px;padding:14px 16px;border-radius:12px;background:linear-gradient(135deg,#fff7ed,#fff);border:1px solid #fed7aa}
.script-box.cmp{background:linear-gradient(135deg,#eff6ff,#fff);border-color:#bfdbfe}
.script-ico{font-size:22px;line-height:1.3;flex:0 0 auto}
.script-h{font-size:12px;font-weight:700;color:#b45309;letter-spacing:.3px;margin-bottom:4px}
.script-box.cmp .script-h{color:#1d4ed}
.script-t{font-size:14.5px;line-height:1.7;color:#3f3f46;font-weight:500}

@media(max-width:860px){
  .sidebar{display:none}
  .detail{grid-template-columns:1fr}
  .detail-img-wrap{position:static}
}