/* Contrast — a WCAG colour contrast checker. Dark ANSI theme, same tokens as the homepage. */
:root{
  color-scheme:dark;
  --bg:#0c0c0c;
  --bg-2:#111418;
  --border:rgba(255,255,255,0.10);
  --border-strong:rgba(255,255,255,0.16);
  --fg:#d8d8d8;
  --fg-dim:#9a9a9a;
  --fg-faint:#6e7278;
  --ink:#f2f2f2;
  --black:#1c1c1c;--red:#cd3131;--green:#0dbc79;--yellow:#e5e510;--blue:#2472c8;--magenta:#bc3fbc;--cyan:#11a8cd;--white:#e5e5e5;
  --bright-red:#f14c4c;--bright-green:#23d18b;--bright-yellow:#f5f543;--bright-blue:#3b8eea;--bright-magenta:#d670d6;--bright-cyan:#29b8db;--bright-white:#f5f5f5;
  --accent:var(--bright-cyan);
  --mono:ui-monospace,SFMono-Regular,"DejaVu Sans Mono",Menlo,Consolas,"Liberation Mono",monospace;
  font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--fg);
  background:var(--bg);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);min-height:100vh;display:flex;flex-direction:column}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:radial-gradient(rgba(41,184,219,0.06) 1px,transparent 1px);
  background-size:34px 34px;opacity:.5}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
a{color:inherit}
:focus-visible{outline:2px solid var(--bright-cyan);outline-offset:2px}

header{display:flex;align-items:baseline;gap:16px;padding:22px clamp(20px,6vw,64px);border-bottom:1px solid var(--border)}
.brand{font-family:var(--mono);font-weight:700;font-size:15px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink);text-decoration:none}
.tool-name{font-family:var(--mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}
.tool-name::before{content:"/";color:var(--fg-faint);margin-right:14px}

main{flex:1;width:min(880px,100%);margin:0 auto;padding:36px clamp(20px,6vw,64px) 56px;display:flex;flex-direction:column;gap:22px}

.panels{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.panel{background:var(--bg-2);border:1px solid var(--border);border-radius:14px;padding:20px}
.panel-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px}
.panel-head h2{font-family:var(--mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--fg-dim);margin:0}
.panel-head output{font-family:var(--mono);font-size:13px;color:var(--ink)}
.field-row{display:flex;gap:10px;margin-bottom:14px}
.hex{flex:1;min-width:0;font-family:var(--mono);font-size:14px;color:var(--ink);background:var(--bg);border:1px solid var(--border-strong);border-radius:8px;padding:9px 12px}
.hex.invalid{border-color:var(--bright-red)}
input[type="color"]{width:42px;height:40px;padding:0;border:1px solid var(--border-strong);border-radius:8px;background:var(--bg);cursor:pointer}
input[type="color"]::-webkit-color-swatch-wrapper{padding:3px}
input[type="color"]::-webkit-color-swatch{border:none;border-radius:5px}
input[type="color"]::-moz-color-swatch{border:none;border-radius:5px}
.swatches{display:grid;grid-template-columns:repeat(8,1fr);gap:6px}
.swatches button{aspect-ratio:1;border:1px solid rgba(255,255,255,0.12);border-radius:6px;cursor:pointer;padding:0}
.swatches button[aria-pressed="true"]{outline:2px solid var(--bright-cyan);outline-offset:2px}

.swap-row{display:flex;justify-content:center}
.quiet-button{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);background:rgba(41,184,219,0.08);border:1px solid rgba(41,184,219,0.28);border-radius:9px;padding:10px 18px;cursor:pointer}
.quiet-button:hover{background:rgba(41,184,219,0.16)}

.result{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:center;background:var(--bg-2);border:1px solid var(--border);border-radius:14px;padding:22px}
.ratio-block{display:flex;flex-direction:column;gap:4px;padding-right:22px;border-right:1px solid var(--border)}
.ratio-label{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--fg-dim)}
.ratio-block strong{font-family:var(--mono);font-size:40px;font-weight:700;letter-spacing:-2px;color:var(--ink);font-variant-numeric:tabular-nums;white-space:nowrap}
.grades{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.grades li{display:flex;align-items:baseline;gap:10px;font-family:var(--mono);font-size:12px}
.grade-name{font-weight:700;color:var(--ink)}
.grade-scope{color:var(--fg-faint);flex:1}
.grade-verdict{font-weight:700;letter-spacing:.08em;text-transform:uppercase}
.grade-verdict.pass{color:var(--bright-green)}
.grade-verdict.fail{color:var(--bright-red)}

.preview{border:1px solid var(--border);border-radius:14px;padding:26px 28px}
.preview-heading{font-family:var(--mono);font-weight:700;font-size:22px;margin:0 0 8px}
.preview-body{font-size:15px;line-height:1.7;margin:0}

footer{padding:20px clamp(20px,6vw,64px) 26px;border-top:1px solid var(--border);font-size:13px;color:var(--fg-dim)}
footer a{color:var(--fg);text-decoration:none;font-family:var(--mono)}

@media(max-width:720px){
  .panels{grid-template-columns:1fr}
  .result{grid-template-columns:1fr;gap:16px}
  .ratio-block{border-right:none;border-bottom:1px solid var(--border);padding-right:0;padding-bottom:14px}
}
@media(prefers-reduced-motion:no-preference){
  .quiet-button,.swatches button{transition:background .15s ease,outline-color .15s ease}
}