:root{
    --bg:#f6faf7;
    --surface:#ffffff;
    --ink:#0e1c14;
    --muted:#5a6b62;
    --line:#e3ece7;
    --green:#0f7a4a;
    --green-2:#1aa06a;
    --green-soft:#e8f5ee;
    --silver:#8a94a0;
    --silver-2:#b8c1cc;
    --silver-soft:#eef1f5;
    --silver-ink:#3b4552;
    --red:#c8362d;
    --shadow:0 1px 2px rgba(15,30,20,.04),0 8px 24px rgba(15,30,20,.06);
    --radius:14px;
    --font:'DM Sans',sans-serif;
    --display:'DM Serif Display',serif;
  }
  *{box-sizing:border-box}
  html,body{margin:0;padding:0}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,sans-serif;
    color:var(--ink);
    background:var(--bg);
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
  }
  a{color:var(--green);text-decoration:none}
  a:hover{text-decoration:underline}


  /* Hero */
  .hero{
    max-width:1200px;margin:0 auto;padding:44px 20px 12px;
  }
  .pill{
    display:inline-flex;align-items:center;gap:8px;
    background:var(--green-soft);color:var(--green);
    padding:6px 12px;border-radius:999px;font-size:13px;font-weight:600;
    border:1px solid #cfe6da;
  }
  .pill .dot{width:8px;height:8px;background:var(--green-2);border-radius:50%;box-shadow:0 0 0 4px rgba(26,160,106,.15)}
  h1{
    font-size:clamp(32px,5vw,52px);
    line-height:1.08;margin:18px 0 12px;letter-spacing:-.02em;
    font-weight:700;
  }
  h1 em{font-style:italic;color:var(--silver);font-weight:700}
  .lede{color:var(--muted);font-size:17px;max-width:780px}

  /* Section header */
  .section{max-width:1200px;margin:0 auto;padding:36px 20px}
  .section-tag{
    color:var(--green);font-weight:700;letter-spacing:.02em;font-size:13.5px;
    display:flex;align-items:center;gap:8px;text-transform:uppercase;
  }
  .section-tag::before{content:"●";color:var(--green-2)}
  .section h2{
    font-size:clamp(24px,3.4vw,34px);margin:6px 0 6px;letter-spacing:-.01em;font-weight:700;
  }
  .section p.sub{color:var(--muted);margin:0 0 22px;max-width:760px}

  /* Live rate card */
  .rate-grid{
    display:grid;gap:16px;
    grid-template-columns:repeat(3,1fr);
  }
  @media (max-width:820px){.rate-grid{grid-template-columns:1fr}}
  .rate-card{
    background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
    padding:22px;box-shadow:var(--shadow);position:relative;overflow:hidden;
  }
  .rate-card::before{
    content:"";position:absolute;inset:0 0 auto 0;height:4px;
    background:linear-gradient(90deg,#98a2ae,#d0d7df);
  }
  .rate-card.s925::before{background:linear-gradient(90deg,#8a94a0,#b8c1cc)}
  .rate-card.s800::before{background:linear-gradient(90deg,#6f7783,#a1aab5)}
  .rate-card .k{
    display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;
  }
  .rate-card .k strong{font-size:16px}
  .rate-card .k .badge{
    background:var(--silver-soft);color:var(--silver-ink);font-size:12px;font-weight:700;
    padding:3px 8px;border-radius:6px;border:1px solid #dce1e8;
  }
  .rate-card .price{
    font-size:34px;font-weight:700;letter-spacing:-.01em;margin:2px 0 4px;
  }
  .rate-card .per{color:var(--muted);font-size:13.5px}
  .rate-card .change{
    margin-top:12px;display:inline-flex;align-items:center;gap:6px;
    padding:5px 10px;border-radius:8px;font-weight:600;font-size:13px;
    background:#eaf7f0;color:#0b7a49;
  }
  .rate-card .change.down{background:#fdebe9;color:var(--red)}

  .updated{
    color:var(--muted);font-size:13px;margin-top:10px;
  }

  /* Weight/purity table */
  .weight-wrap{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    box-shadow:var(--shadow);overflow:hidden;
  }
  .tabs{
    display:flex;gap:0;border-bottom:1px solid var(--line);background:#fafcfb;
  }
  .tabs button{
    flex:1;padding:12px 14px;background:none;border:0;font-weight:600;color:#3a4c42;
    cursor:pointer;font-size:14px;border-bottom:2px solid transparent;
  }
  .tabs button.active{color:var(--green);border-bottom-color:var(--green)}
  table{width:100%;border-collapse:collapse;font-size:14.5px}
  thead th{
    text-align:left;padding:12px 16px;background:#f4faf6;color:#334640;
    font-weight:600;border-bottom:1px solid var(--line);font-size:13px;
    text-transform:uppercase;letter-spacing:.02em;
  }
  tbody td{padding:12px 16px;border-bottom:1px solid var(--line);color:#22332a}
  tbody tr:last-child td{border-bottom:0}
  tbody tr:hover{background:#f6faf7}
  td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
  .chip-up{color:#0b7a49;font-weight:600;font-size:13px}
  .chip-down{color:var(--red);font-weight:600;font-size:13px}

  /* City search + table */
  .search{
    display:flex;gap:10px;margin:0 0 14px;flex-wrap:wrap;
  }
  .search input{
    flex:1;min-width:220px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;
    font-size:15px;background:#fff;outline:none;
  }
  .search input:focus{border-color:var(--green-2);box-shadow:0 0 0 3px rgba(26,160,106,.12)}
  .search select{
    padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:14px;
  }

  /* Section split */
  .split{
    display:grid;gap:22px;grid-template-columns:2fr 1fr;
  }
  @media (max-width:900px){.split{grid-template-columns:1fr}}
  .card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    padding:22px;box-shadow:var(--shadow);
  }
  .card h3{margin:0 0 6px;font-size:18px}
  .card .h-sub{color:var(--muted);font-size:13.5px;margin:0 0 14px}
  .kv{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
  .kv:last-child{border-bottom:0}
  .kv b{font-variant-numeric:tabular-nums}

  /* Trend list */
  .trend li{
    display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px dashed var(--line);
    font-size:14.5px;
  }
  .trend{list-style:none;padding:0;margin:0}
  .trend li:last-child{border:0}
  .trend .d{color:#3a4c42}
  .trend .p{font-variant-numeric:tabular-nums;font-weight:600}

  /* State grid */
  .state-grid{
    display:grid;grid-template-columns:repeat(4,1fr);gap:12px;
  }
  @media (max-width:960px){.state-grid{grid-template-columns:repeat(3,1fr)}}
  @media (max-width:680px){.state-grid{grid-template-columns:repeat(2,1fr)}}
  .state-card{
    background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;
    box-shadow:0 1px 2px rgba(15,30,20,.03);transition:transform .15s,box-shadow .15s;
  }
  .state-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#cfe6da}
  .state-card .s{font-weight:700;font-size:14.5px;color:#0e1c14;margin-bottom:8px;display:flex;justify-content:space-between;align-items:center}
  .state-card .s span{background:var(--silver-soft);color:var(--silver-ink);font-size:11px;padding:2px 6px;border-radius:5px;border:1px solid #dce1e8}
  .state-card .p22,.state-card .p24{display:flex;justify-content:space-between;font-size:13px;padding:3px 0;color:#3a4c42;font-variant-numeric:tabular-nums}
  .state-card .p22 b,.state-card .p24 b{color:#0e1c14}

  /* AI intelligence */
  .intel{
    display:grid;grid-template-columns:1fr 1fr;gap:16px;
  }
  @media (max-width:820px){.intel{grid-template-columns:1fr}}
  .intel-card{
    background:linear-gradient(180deg,#ffffff,#f6faf7);
    border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);
  }
  .intel-card .head{display:flex;align-items:center;gap:10px;margin-bottom:10px}
  .intel-card .icon{
    width:34px;height:34px;border-radius:9px;display:grid;place-items:center;
    background:var(--green-soft);color:var(--green);font-size:18px;
  }
  .intel-card .icon.silver{background:var(--silver-soft);color:var(--silver-ink)}
  .intel-card h4{margin:0;font-size:16px}
  .intel-card .stamp{color:var(--muted);font-size:12.5px;margin-top:12px}

  /* FAQ */
  details{
    background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px;
  }
  details[open]{border-color:#cfe6da}
  summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center}
  summary::-webkit-details-marker{display:none}
  summary::after{content:"+";color:var(--green);font-size:22px;font-weight:400;transition:transform .15s}
  details[open] summary::after{content:"–"}
  details p{margin:10px 0 0;color:#3a4c42}

  /* Disclaimer + stats */
  .disclaimer{
    background:var(--green-soft);border:1px solid #cfe6da;border-radius:12px;padding:16px 18px;
    color:#22553c;font-size:13.5px;
  }
  .stats{
    display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:26px;
  }
  @media (max-width:680px){.stats{grid-template-columns:1fr}}
  .stat{
    background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;text-align:center;
    box-shadow:var(--shadow);
  }
  .stat .n{font-size:32px;font-weight:800;color:var(--green);letter-spacing:-.01em}
  .stat .l{color:var(--muted);font-size:13.5px;margin-top:4px}

  /* Utility */
  .row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
  .divider{height:1px;background:var(--line);margin:24px 0}
  .live{
    display:inline-flex;align-items:center;gap:6px;font-size:12.5px;color:var(--green);font-weight:600;
  }
  .live .b{width:7px;height:7px;background:#20c07a;border-radius:50%;box-shadow:0 0 0 3px rgba(32,192,122,.2);animation:blink 1.6s infinite}
  @keyframes blink{50%{opacity:.35}}