:root{--red:#e21902;--ink:#2c2d33;--line:#e3e8ee;--bg:#f4f6f8;--muted:#6b7682}
 *{box-sizing:border-box} body{font:16px/1.55 -apple-system,Segoe UI,Roboto,Helvetica,Arial;margin:0;color:var(--ink);background:var(--bg)}
 a{color:inherit;text-decoration:none;cursor:pointer}
 header{background:#fff;border-bottom:3px solid var(--red);padding:13px 24px;display:flex;align-items:center;gap:16px;position:sticky;top:0;z-index:20}
 header img{height:38px} header .h{font-weight:700;font-size:17px} header .h small{display:block;font-weight:400;color:var(--muted);font-size:12px}
 header .sp{flex:1} .qbtn{background:var(--ink);color:#fff;padding:9px 15px;border-radius:8px;font-weight:600;font-size:14px}
 .qbtn b{background:var(--red);border-radius:10px;padding:1px 7px;margin-left:6px}
 .hsearch{flex:1;max-width:430px;display:flex;min-width:130px}
 .hsearch input{flex:1;min-width:0;padding:9px 12px;border:1px solid var(--line);border-right:0;border-radius:8px 0 0 8px;font:inherit;font-size:14px}
 .hsearch input:focus{outline:2px solid var(--red);outline-offset:-2px}
 .hsearch button{background:var(--ink);color:#fff;border:0;padding:9px 15px;border-radius:0 8px 8px 0;font-weight:600;font-size:14px;cursor:pointer;white-space:nowrap}
 .wrap{max-width:1080px;margin:24px auto 50px;padding:0 20px}
 .hero{background:#fff;border:1px solid var(--line);border-radius:14px;padding:30px}
 .hero h1{margin:0 0 6px;font-size:26px} .hero p{margin:0 0 16px;color:var(--muted)}
 .search{width:100%;padding:15px 18px;border:2px solid var(--red);border-radius:10px;font-size:17px}
 .tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin:20px 0}
 .tile{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;transition:box-shadow .15s,border-color .15s}
 .tile:hover{box-shadow:0 6px 18px rgba(20,25,30,.09);border-color:#cdd6df}
 .tile b{font-size:17px;display:block} .tile i{color:var(--muted);font-style:normal;font-size:13px}
 .entry{margin:18px 0} .entry h3{margin:0 0 8px;font-size:15px}
 .chips{display:flex;flex-wrap:wrap;gap:8px} .chip{border:1px solid var(--line);background:#fff;padding:8px 14px;border-radius:20px;font-size:14px;font-weight:600}
 .chip:hover{border-color:var(--red);color:var(--red)}
 .browse{display:grid;grid-template-columns:230px 1fr;gap:22px}
 .facets h4{margin:14px 0 6px;font-size:12px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted)}
 .fopt{display:flex;justify-content:space-between;width:100%;border:0;background:none;text-align:left;padding:5px 6px;border-radius:6px;cursor:pointer;font-size:14px;color:var(--ink)}
 .fopt:hover{background:#eef1f4} .fopt.on{background:var(--red);color:#fff} .fopt i{opacity:.6;font-style:normal;font-size:12px}
 .results h2{margin:0 0 2px} .count{color:var(--muted);margin:0 0 14px}
 .chiprow{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px} .chiprow .chip a{color:var(--red);font-weight:700;margin-left:4px}
 .cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:14px}
 .card{background:#fff;border:1px solid var(--line);border-radius:11px;padding:15px 17px;display:flex;flex-direction:column;transition:box-shadow .15s,border-color .15s}
 .card:hover{box-shadow:0 6px 18px rgba(20,25,30,.09);border-color:#cdd6df}
 .card .cat{font-size:11px;font-weight:700;color:var(--red);text-transform:uppercase;letter-spacing:.4px}
 .card .title{font-weight:700;font-size:15px;margin:3px 0;display:block} .card .title:hover{color:var(--red)}
 .card .spec{color:var(--muted);font-size:13px;min-height:17px} .codes{font-size:13px;margin-top:6px} .codes span{color:var(--muted);margin-right:6px}
 .prices{display:flex;gap:18px;margin:9px 0} .pr span{display:block;font-size:11px;color:var(--muted)} .pr b{font-size:17px} .pr.trade b{color:var(--red)} .pr .quote{font-size:14px}
 .actions{margin-top:auto;display:flex;gap:8px}
 .btn{background:var(--red);color:#fff;border:0;padding:10px 16px;border-radius:8px;font-weight:600;cursor:pointer;font-size:14px}
 .btn.sm{padding:7px 12px;font-size:13px} .btn.ghost{background:#fff;color:var(--muted);border:1px solid var(--line)}
 .hint,.empty{margin-top:14px;padding:13px 15px;background:#fff;border:1px dashed #cdd6df;border-radius:10px;color:var(--muted)}
 .seohead h1{margin:4px 0 6px;font-size:24px} .seohead .intro{color:#414a52;max-width:760px;margin:0 0 14px}
 .faqs{background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px 18px 14px;margin:8px 0 18px} .faqs h3{margin:12px 0 6px;font-size:16px}
 .faq{border-bottom:1px solid var(--line);padding:8px 0} .faq summary{font-weight:600;cursor:pointer} .faq p{color:#414a52;margin:8px 0 2px}
 .detail .back{color:var(--muted);font-weight:600} .dtop{display:flex;flex-wrap:wrap;gap:24px;margin:12px 0}
 .dhero{flex:0 0 260px} .dhero img{width:100%;border:1px solid var(--line);border-radius:12px;background:#fff;padding:10px}
 .dmain{flex:1 1 320px} .ds{color:var(--red);font-weight:600;font-size:14px}
 .card .thumb{display:block;text-align:center;margin:-2px 0 8px} .card .thumb img{height:120px;object-fit:contain;max-width:100%}
 .dmain h1{margin:4px 0 8px;font-size:23px} .lead{color:#414a52}
 .dbuy{flex:0 0 280px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;display:flex;flex-direction:column;gap:10px;height:fit-content}
 .genuine{color:#1a7f37;font-size:13px;font-weight:600}
 .safe{padding:9px 12px;border-radius:8px;font-size:14px;margin:6px 0}
 .safe.oxygen{background:#e7f1fb;color:#13457a} .safe.acetylene,.safe.fuel{background:#fdecec;color:#a4161a} .safe.medical{background:#fff4e5;color:#7a4a00}
 .legacy{background:#fff4e5;color:#7a4a00;padding:10px 12px;border-radius:8px;margin:8px 0;font-size:14px}
 .tags{margin-top:10px;display:flex;flex-wrap:wrap;gap:6px} .tag{background:#eef1f4;padding:4px 10px;border-radius:14px;font-size:12px;font-weight:600;color:var(--muted)}
 table.spec{width:100%;border-collapse:collapse;margin:14px 0} table.spec th{text-align:left;width:200px;color:var(--muted);font-weight:600;padding:7px 8px;border-bottom:1px solid var(--line);font-size:14px}
 table.spec td{padding:7px 8px;border-bottom:1px solid var(--line);font-size:14px}
 .detail h3{margin:22px 0 4px}
 .overlay{position:fixed;inset:0;background:rgba(20,25,30,.45);display:flex;align-items:center;justify-content:center;z-index:50}
 .dialog{background:#fff;border-radius:14px;padding:24px;width:min(460px,92vw);box-shadow:0 20px 60px rgba(0,0,0,.25)}
 .dialog h3{margin:0 0 8px} .dialog form{display:flex;flex-direction:column;gap:9px;margin-top:6px} .dialog label{font-size:13px;font-weight:600;display:flex;flex-direction:column;gap:4px}
 .dialog input,.dialog textarea{padding:9px 11px;border:1px solid #cdd6df;border-radius:8px;font-size:15px;font-family:inherit}
 .drow{flex-direction:row!important;gap:10px} .ok{color:#1a7f37;font-weight:600} .err{color:var(--red);font-weight:600}
 .qitems{font-size:14px;color:var(--muted);padding-left:18px;margin:4px 0} .qitems span{font-size:12px}
 @media(max-width:760px){.browse{grid-template-columns:1fr} .dtop{grid-template-columns:1fr} header{flex-wrap:wrap;gap:10px 14px} .hsearch{order:5;flex-basis:100%;max-width:none} .h small{display:none}}

.thumb img{cursor:pointer}
[hidden]{display:none!important}
.facets .frefine{margin:0 0 4px;font-size:12px;text-transform:none;letter-spacing:0;color:var(--ink);font-weight:700}
.facets .fopt{text-decoration:none}