:root{
  --brand:#e8620c;
  --brand-dark:#c24e05;
  --ink:#1a1a1a;
  --muted:#666;
  --line:#e8e8e8;
  --bg:#fafafa;
  --card:#ffffff;
  --rE:#16a34a; --rEbg:#e8f7ee;
  --rG:#65a30d; --rGbg:#f1f8e4;
  --rF:#ca8a04; --rFbg:#fef9e7;
  --rN:#dc2626; --rNbg:#fdecec;
  --radius:10px;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
/* header */
.site-header{background:#111;color:#fff}
.header-inner{display:flex;justify-content:space-between;align-items:center;padding:14px 20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:8px;background:var(--brand);color:#fff;font-weight:800;font-size:20px}
.brand-text{font-weight:700;font-size:18px}
.brand-text em{font-style:normal;color:var(--brand)}
.header-nav a{color:#ccc;text-decoration:none;margin-left:18px;font-size:14px}
.header-nav a:hover{color:#fff}
/* hero */
.hero{padding:40px 0 8px;text-align:center}
.hero h1{font-size:clamp(26px,4.5vw,38px);margin:0 0 10px;letter-spacing:-.5px}
.lede{color:var(--muted);max-width:640px;margin:0 auto 22px;font-size:17px}
.pill{display:inline-block;padding:1px 10px;border-radius:20px;font-size:13px;font-weight:600;color:#fff}
.pill.rE{background:var(--rE)} .pill.rG{background:var(--rG)}
.pill.rF{background:var(--rF)} .pill.rN{background:var(--rN)}
.search-box{position:relative;max-width:560px;margin:0 auto}
.search-box input{width:100%;padding:15px 18px;font-size:16px;border:2px solid var(--line);border-radius:12px;outline:none;background:#fff}
.search-box input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(232,98,12,.15)}
.suggest{position:absolute;top:100%;left:0;right:0;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:0 12px 30px rgba(0,0,0,.12);z-index:20;max-height:320px;overflow:auto;text-align:left}
.suggest button{display:block;width:100%;text-align:left;padding:11px 16px;border:0;background:none;cursor:pointer;font-size:15px;border-bottom:1px solid #f2f2f2}
.suggest button:hover{background:#fff5ec}
.suggest button small{color:var(--muted);margin-left:8px}
.hint{color:#999;font-size:13px;margin-top:10px}
/* result */
.result{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin:28px 0;box-shadow:0 4px 18px rgba(0,0,0,.05)}
.result-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.result-head h2{margin:0;font-size:24px}
.chem-meta{color:var(--muted);margin:4px 0 0;font-size:14px}
.clear-btn{border:1px solid var(--line);background:#fff;border-radius:8px;width:34px;height:34px;cursor:pointer;color:var(--muted);font-size:15px;flex:none}
.clear-btn:hover{border-color:var(--rN);color:var(--rN)}
.tip{background:#fff8f0;border-left:4px solid var(--brand);padding:12px 16px;border-radius:0 8px 8px 0;font-size:15px;margin:16px 0 20px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:16px;background:#fff}
.card .mat{font-weight:700;font-size:16px;margin-bottom:2px}
.card .mat-full{font-size:12px;color:var(--muted)}
.card .mat-desc{font-size:13px;color:var(--muted);margin:8px 0 12px;min-height:40px}
.badge{display:inline-block;padding:5px 14px;border-radius:20px;color:#fff;font-weight:700;font-size:14px}
.badge.rE{background:var(--rE)} .badge.rG{background:var(--rG)}
.badge.rF{background:var(--rF)} .badge.rN{background:var(--rN)}
.card.rE{border-top:4px solid var(--rE)} .card.rG{border-top:4px solid var(--rG)}
.card.rF{border-top:4px solid var(--rF)} .card.rN{border-top:4px solid var(--rN)}
.legend{margin-top:20px;display:grid;gap:6px;font-size:13px;color:var(--muted)}
.dot{display:inline-block;width:11px;height:11px;border-radius:50%;margin-right:8px}
.dot.rE{background:var(--rE)} .dot.rG{background:var(--rG)}
.dot.rF{background:var(--rF)} .dot.rN{background:var(--rN)}
/* browse */
.browse h2,.disclaimer h2,.cta h2{font-size:22px;margin:36px 0 14px}
.family-filter{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.family-filter button{border:1px solid var(--line);background:#fff;border-radius:20px;padding:6px 14px;font-size:13px;cursor:pointer;color:var(--muted)}
.family-filter button.active{background:var(--brand);border-color:var(--brand);color:#fff}
.chem-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}
.chem-list button{width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:8px;padding:10px 14px;cursor:pointer;font-size:14px}
.chem-list button:hover{border-color:var(--brand);background:#fff8f0}
.chem-list button small{display:block;color:var(--muted);font-size:12px}
/* disclaimer + cta */
.disclaimer p{background:#fff;border:1px solid var(--line);border-left:4px solid #999;border-radius:0 8px 8px 0;padding:14px 18px;font-size:14px;color:var(--muted)}
.cta{background:#111;color:#fff;border-radius:var(--radius);padding:32px 28px;margin:36px 0 48px;text-align:center}
.cta h2{color:#fff;margin-top:0}
.cta p{color:#bbb;max-width:560px;margin:0 auto 20px}
.cta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 28px;border-radius:8px;font-weight:700;text-decoration:none;font-size:15px}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{border:1px solid #555;color:#fff}
.btn-ghost:hover{border-color:#fff}
.site-footer{border-top:1px solid var(--line);padding:20px 0;color:var(--muted);font-size:13px;text-align:center}
.site-footer a{color:var(--brand)}
@media(max-width:600px){
  .cards{grid-template-columns:1fr}
  .result{padding:18px}
}