:root{--bg:#f7f8fa;--card:#fff;--ink:#11181c;--muted:#5b6770;--line:#e4e8ec;--accent:#0a5fff;--accent-ink:#fff;--up:#0a8f5b;--down:#c0392b;--radius:12px;--maxw:760px}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--ink);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji;font-size:17px;line-height:1.55}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--line);background:var(--card)}.site-header .wrap{justify-content:space-between;align-items:center;height:60px;display:flex}.brand{color:var(--ink);font-size:18px;font-weight:700}.brand span{color:var(--accent)}.nav a{color:var(--muted);margin-left:18px;font-size:15px}.site-footer{border-top:1px solid var(--line);color:var(--muted);margin-top:56px;padding:28px 0;font-size:14px}.site-footer .wrap{flex-direction:column;gap:8px;display:flex}main{padding:32px 0}h1{letter-spacing:-.01em;margin:0 0 8px;font-size:30px;line-height:1.2}h2{margin:36px 0 12px;font-size:21px}.lede{color:var(--muted);margin:0 0 24px;font-size:18px}.muted{color:var(--muted)}.rate-hero{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);margin:18px 0;padding:22px 24px}.rate-hero .big{letter-spacing:-.02em;font-size:34px;font-weight:700}.rate-hero .sub{color:var(--muted);margin-top:4px}.delta-up{color:var(--up);font-weight:600}.delta-down{color:var(--down);font-weight:600}.chart{width:100%;height:auto;display:block}.chart-empty{color:var(--muted);padding:20px 0}.chart-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);margin:12px 0 4px;padding:18px}.chart-meta{color:var(--muted);justify-content:space-between;margin-top:8px;font-size:13px;display:flex}table{border-collapse:collapse;width:100%;margin:8px 0}th,td{text-align:left;border-bottom:1px solid var(--line);padding:10px 12px}th{color:var(--muted);font-size:14px;font-weight:600}tbody tr:hover{background:#fafbfc}td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}.widget{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);margin:16px 0;padding:18px}.widget-form{grid-template-columns:1fr 1fr 1fr 1.2fr auto;align-items:end;gap:10px;display:grid}.field{flex-direction:column;gap:4px;display:flex}.field label{color:var(--muted);font-size:12px;font-weight:600}.field input,.field select{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:8px;padding:9px 10px;font-size:15px}.widget button{background:var(--accent);color:var(--accent-ink);cursor:pointer;border:none;border-radius:8px;height:40px;padding:10px 18px;font-size:15px;font-weight:600}.widget button:disabled{opacity:.6;cursor:default}.widget-result{background:#f0f6ff;border-radius:8px;margin-top:14px;padding:12px 14px;font-size:19px}.widget-error{color:var(--down);margin-top:12px}.widget-api{margin-top:14px}.widget-api summary{cursor:pointer;color:var(--accent);font-size:14px}.widget-api pre{color:#e6edf3;background:#0f1419;border-radius:8px;margin:10px 0 6px;padding:12px;font-size:13px;overflow-x:auto}.grid{grid-template-columns:repeat(2,1fr);gap:12px;margin:12px 0;display:grid}.tile{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px}.tile .t-pair{font-weight:600}.tile .t-sub{color:var(--muted);font-size:14px}.faq dt{margin-top:16px;font-weight:600}.faq dd{color:var(--muted);margin:4px 0 0}pre code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.small{font-size:13px}.widget-form-color{grid-template-columns:1fr auto;align-items:end;gap:10px;display:grid}.field.grow{min-width:0}.color-picker{border:1px solid var(--line);cursor:pointer;background:#fff;border-radius:8px;width:52px;height:40px;padding:2px}.big-swatch{border-radius:var(--radius);border:1px solid var(--line);letter-spacing:-.01em;flex-direction:column;gap:4px;margin:16px 0;padding:28px 20px;font-size:26px;font-weight:700;display:flex}.big-swatch-sub{opacity:.85;font-size:14px;font-weight:500}.hero-swatch{border-radius:var(--radius);border:1px solid var(--line);flex-direction:column;gap:4px;margin:14px 0 18px;padding:40px 22px;display:flex}.hero-hex{letter-spacing:-.01em;font-size:30px;font-weight:700}.hero-sub{opacity:.9;font-size:15px}.copy-grid{grid-template-columns:1fr 1fr;gap:8px;margin:12px 0;display:grid}.copy-row{background:var(--card);border:1px solid var(--line);border-radius:8px;align-items:center;gap:8px;padding:8px 10px;display:flex}.copy-label{color:var(--muted);flex:none;width:48px;font-size:12px;font-weight:700}.copy-value{white-space:nowrap;flex:1;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;overflow-x:auto}.copy-btn{border:1px solid var(--line);color:var(--accent);cursor:pointer;background:#fff;border-radius:6px;flex:none;padding:5px 10px;font-size:12px;font-weight:600}.copy-btn:hover{background:#f0f6ff}.match-row{grid-template-columns:1fr 1fr;gap:10px;margin:10px 0 4px;display:grid}.match-card{background:var(--card);border:1px solid var(--line);border-radius:8px;align-items:center;gap:12px;padding:12px;display:flex}.match-swatch{border:1px solid var(--line);border-radius:7px;flex:none;width:36px;height:36px}.match-title{color:var(--muted);font-size:12px;font-weight:600}.match-val{font-weight:600}.tile-swatch{border:1px solid var(--line);border-radius:8px;width:100%;height:44px;margin-bottom:10px;display:block}@media (max-width:640px){.grid,.copy-grid,.match-row{grid-template-columns:1fr}h1{font-size:25px}}