:root{
  --bg:#f5f7fa; --card:#fff; --ink:#1f2937; --muted:#6b7280;
  --line:#e5e7eb; --primary:#2563eb; --accent:#0d9488;
  --ok:#16a34a; --warn:#d97706; --bad:#dc2626;
  --radius:14px; --shadow:0 1px 3px rgba(0,0,0,.06),0 8px 24px rgba(0,0,0,.04);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Microsoft YaHei","PingFang SC","Segoe UI",system-ui,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;
}
/* ===== topbar ===== */
.topbar{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:24px;
  padding:0 24px;height:64px;background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.logo{font-size:26px}
.brand-text h1{font-size:17px;margin:0;letter-spacing:.5px}
.brand-text .sub{font-size:12px;color:var(--muted)}
.tabs{
  display:flex;gap:4px;
  flex:1;min-width:0;
  overflow-x:auto;overflow-y:hidden;
  scrollbar-width:none;-ms-overflow-style:none;
  padding:4px 0;
}
.tabs::-webkit-scrollbar{display:none}
.tab{
  flex-shrink:0;
  padding:8px 16px;border-radius:999px;text-decoration:none;color:var(--muted);
  font-size:14px;font-weight:600;transition:.15s;white-space:nowrap;
  -webkit-tap-highlight-color:transparent;
}
.tab:hover{background:#eef2f7;color:var(--ink)}
.tab.active{background:var(--primary);color:#fff;box-shadow:0 4px 12px rgba(37,99,235,.3)}
.search{flex-shrink:0;margin-left:auto}
.search input{
  width:230px;padding:8px 14px;border:1px solid var(--line);border-radius:999px;
  font-size:14px;outline:none;background:#fff;transition:.15s;
}
.search input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}

/* ===== main view ===== */
.view{max-width:1180px;margin:0 auto;padding:28px 24px 80px;min-height:calc(100vh - 64px)}

/* ===== footer ===== */
.footer{
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;
  padding:18px 24px;border-top:1px solid var(--line);color:var(--muted);
  font-size:12px;background:#fff;
}

/* ===== page head ===== */
.page-head{margin-bottom:24px}
.page-head h2{margin:0 0 6px;font-size:26px;display:flex;align-items:center;gap:10px}
.page-head p{margin:0;color:var(--muted);font-size:14px}
.crumbs{font-size:12px;color:var(--muted);margin-bottom:10px}
.crumbs a{color:var(--primary);text-decoration:none}

/* ===== card ===== */
.card{
  background:var(--card);border-radius:var(--radius);padding:22px 24px;
  box-shadow:var(--shadow);margin-bottom:20px;border:1px solid var(--line);
}
.card-title{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.card-title h3{margin:0;font-size:18px}
.card-title .src{font-size:11px;color:var(--muted);background:#f3f4f6;padding:3px 9px;border-radius:6px;white-space:nowrap}
.note{font-size:13px;color:var(--muted);margin:-4px 0 16px}

/* ===== table ===== */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -4px;padding:0 4px}
table{width:100%;border-collapse:collapse;font-size:14px;table-layout:fixed;min-width:480px}
th,td{text-align:left;padding:11px 15px;border-bottom:1px solid var(--line);vertical-align:top;word-break:break-word}
th{background:#f9fafb;font-weight:600;color:#374151;position:sticky;top:0}
tbody tr:hover{background:#fafbfc}
table.col2 th:first-child,table.col2 td:first-child{width:42%}
table.col2 th:last-child,table.col2 td:last-child{width:58%}
/* ===== brand-grid ===== */
.brand-grid{
  display:grid;
  grid-template-columns:240px 1fr;
  column-gap:80px;
  row-gap:0;
  font-size:14px;
  border:1px solid var(--line);
  border-radius:8px;
  overflow:hidden;
}
.brand-grid .bh{
  font-weight:600;color:#374151;
  background:#f9fafb;padding:14px 18px;
  border-bottom:2px solid var(--line);
  white-space:nowrap;
}
.brand-grid .bc{
  padding:14px 18px;
  border-bottom:1px solid var(--line);
  white-space:nowrap;
  min-width:0;
}
.brand-grid .bc.brand{font-weight:600;font-family:Consolas,"Courier New",monospace}
.brand-grid .bc:nth-last-child(-n+2){border-bottom:none}
.brand-grid pre.cell{white-space:nowrap}
@media(max-width:520px){
  .brand-grid{grid-template-columns:120px 1fr;gap:0 30px}
}
td.num,th.num{width:54px;text-align:center;color:var(--muted);font-variant-numeric:tabular-nums}
.mono{font-family:Consolas,"Courier New",monospace}
pre.cell{white-space:pre-wrap;margin:0;font-family:inherit;font-size:14px}

/* ===== badges ===== */
.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:600}
.b-crit{background:#fee2e2;color:#b91c1c}
.b-main{background:#ffedd5;color:#c2410c}
.b-min{background:#dcfce7;color:#15803d}

/* ===== logic ===== */
.logic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin-bottom:18px}
.logic-card{border:1px solid var(--line);border-radius:10px;padding:14px;background:#fff}
.logic-card.single{border-left:4px solid var(--primary)}
.logic-card.master{border-left:4px solid var(--warn)}
.logic-card .lbl{font-size:12px;color:var(--muted);margin-bottom:8px}
.logic-card .skus{display:flex;flex-wrap:wrap;gap:6px}
.logic-card .sku{font-family:Consolas,monospace;background:#f3f4f6;padding:3px 8px;border-radius:5px;font-size:13px}
.rules{background:#eff6ff;border-radius:10px;padding:16px 20px;border-left:4px solid var(--primary)}
.rules ol{margin:0;padding-left:20px}
.rules li{margin-bottom:6px;font-size:14px}

/* ===== compare ===== */
.cmp{display:grid;grid-template-columns:120px 1fr 1fr;gap:0;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.cmp .h{background:#f9fafb;font-weight:600;padding:10px 14px;border-bottom:1px solid var(--line);text-align:center}
.cmp .item{font-weight:600;padding:12px 14px;border-bottom:1px solid var(--line);border-right:1px solid var(--line);background:#fafbfc}
.cmp .cell{padding:12px 14px;border-bottom:1px solid var(--line)}
.cmp .cell.us{border-right:1px solid var(--line)}
.cmp .cell.us,.cmp .cell.us pre.cell{color:#1d4ed8}
.cmp .cell.eu,.cmp .cell.eu pre.cell{color:#b45309}
.cmp .row:last-child>*{border-bottom:none}
.cmp-flag{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:13px}
.flag-us{color:#1d4ed8}.flag-eu{color:#b45309}
.footer-note{margin-top:14px;background:#fef3c7;border-radius:8px;padding:12px 16px;font-size:13px;color:#92400e}

/* ===== grade ===== */
.grade{border-left:6px solid var(--bad);border-radius:0 10px 10px 0;padding:18px 22px;margin-bottom:16px;background:#fff;border:1px solid var(--line);border-left-width:6px}
.grade.main{border-left-color:var(--warn)}
.grade.min{border-left-color:var(--ok)}
.grade h4{margin:0 0 4px;font-size:17px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.grade .rate{font-weight:600;color:#374151;font-size:13px;margin-bottom:10px}
.grade dl{margin:6px 0 0;display:grid;grid-template-columns:88px 1fr;gap:6px 12px;font-size:14px}
.grade dt{color:var(--muted);font-weight:600}
.grade dd{margin:0}

/* ===== doc ===== */
.doc-block{margin-bottom:20px}
.doc-block h4{font-size:17px;margin:0 0 8px;color:var(--primary);border-left:4px solid var(--primary);padding-left:10px}
.doc-block h5{font-size:15px;margin:14px 0 6px;color:#374151}
.doc-block p{margin:0 0 8px;font-size:14px}
.doc-block ul{margin:0 0 8px;padding-left:22px}
.doc-block li{margin-bottom:5px;font-size:14px}
.kv{display:grid;grid-template-columns:130px 1fr;gap:8px 14px;background:#f9fafb;border-radius:8px;padding:14px 18px;margin:6px 0}
.kv .k{color:var(--muted);font-weight:600}

/* ===== home ===== */
.hero{text-align:center;padding:40px 20px 30px}
.hero .big{font-size:30px;font-weight:800;margin:0 0 10px}
.hero .lead{color:var(--muted);font-size:15px;max-width:640px;margin:0 auto}
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;margin-top:30px}
.cat-card{
  text-decoration:none;color:inherit;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:.18s;
  display:block;position:relative;overflow:hidden;
}
.cat-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,.1)}
.cat-card .ic{font-size:38px;margin-bottom:12px;display:block}
.cat-card h3{margin:0 0 6px;font-size:18px}
.cat-card p{margin:0;color:var(--muted);font-size:13px}
.cat-card .tag{position:absolute;top:16px;right:16px;width:10px;height:10px;border-radius:50%}
.stat-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px;margin-top:26px}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;text-align:center}
.stat .n{font-size:24px;font-weight:800}
.stat .l{font-size:12px;color:var(--muted);margin-top:2px}

/* ===== search highlight ===== */
mark{background:#fde68a;border-radius:3px;padding:0 2px}
.hidden{display:none!important}

/* ===== responsive: 平板及以下 ===== */
@media(max-width:820px){
  .topbar{
    height:auto;padding:10px 14px;gap:10px;
    flex-wrap:wrap;
  }
  .tabs{
    order:3;width:100%;flex:none;
    gap:6px;padding:2px 0;
  }
  .tab{padding:7px 14px;font-size:13px}
  .brand-text .sub{display:none}
  .search{margin-left:auto;order:2}
  .search input{width:140px}
  .view{padding:18px 14px 60px}

  /* table: 移除最小宽度限制，让小表格正常显示 */
  table{min-width:auto;font-size:13px}
  th,td{padding:9px 10px}

  /* compare */
  .cmp{grid-template-columns:1fr}
  .cmp .item{border-right:none}
  .cmp .cell.us{border-right:none;border-bottom:1px solid var(--line)}

  /* grade */
  .grade dl{grid-template-columns:1fr}
  .grade{padding:14px 16px}

  /* kv */
  .kv{grid-template-columns:1fr}

  /* page head */
  .page-head h2{font-size:22px}
  .hero .big{font-size:26px}
  .hero{padding:30px 14px 20px}
}

/* ===== responsive: 手机 ===== */
@media(max-width:520px){
  .topbar{padding:8px 10px;gap:8px}
  .brand{gap:8px}
  .brand-text h1{font-size:15px}
  .logo{font-size:22px}
  .tab{padding:6px 12px;font-size:12px}
  .search input{width:100%;min-width:80px;font-size:13px}
  .view{padding:14px 10px 50px}

  /* card */
  .card{padding:16px 14px;border-radius:12px}
  .card-title h3{font-size:16px}

  /* table */
  th,td{padding:7px 8px;font-size:12px}
  pre.cell{font-size:12px}

  /* logic */
  .logic-grid{grid-template-columns:1fr;gap:10px}
  .logic-card{padding:12px}

  /* home */
  .hero{padding:24px 10px 16px}
  .hero .big{font-size:22px}
  .hero .lead{font-size:13px}
  .cat-grid{grid-template-columns:1fr;gap:12px}
  .cat-card{padding:18px}
  .cat-card .ic{font-size:30px}
  .stat-row{grid-template-columns:repeat(3,1fr);gap:10px}
  .stat{padding:12px 8px}
  .stat .n{font-size:20px}

  /* compare */
  .cmp .h{padding:8px 10px;font-size:12px}
  .cmp .item,.cmp .cell{padding:10px;font-size:13px}

  /* grade */
  .grade h4{font-size:15px}

  /* doc */
  .doc-block h4{font-size:15px}
  .doc-block p,.doc-block li{font-size:13px}
  .kv{padding:10px 14px;font-size:13px}
  .kv .k{font-size:13px}

  /* rules */
  .rules{padding:12px 14px}
  .rules li{font-size:13px}

  /* footer */
  .footer{flex-direction:column;text-align:center;gap:4px;padding:14px 10px;font-size:11px}
}

/* ===== responsive: 极小屏 ===== */
@media(max-width:380px){
  .brand-text .sub{display:none}
  .stat-row{grid-template-columns:repeat(2,1fr)}
  .topbar{gap:6px}
  .search input{min-width:70px;padding:6px 10px}
  .tabs{gap:4px}
  .tab{padding:5px 10px;font-size:11px}
}