:root{--bg:#f4f6f8;--ink:#14202b;--mute:#5b6b79;--line:#cfd8e0;--ok:#1f7a6b;--bad:#b3362b;--ref:#2f5d8a;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#10171d;--ink:#e6edf3;--mute:#93a4b3;--line:#2a3945;--ok:#4cc2ad;--bad:#f0705f;--ref:#7fb0e6;--card:#18222b}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif}
main{max-width:980px;margin:0 auto;padding:28px 18px 60px}
h1{font-size:1.6rem;margin:.2em 0 .1em;letter-spacing:-.01em}
h2{font-size:1.1rem;margin:1.6em 0 .4em}
p.lead{color:var(--mute);max-width:70ch;margin:.2em 0 1em}
.panel{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:14px;margin:14px 0}
canvas{width:100%;height:auto;display:block}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:10px 18px;margin:10px 0}
label{font-size:.9rem;color:var(--mute);display:block}
label b{color:var(--ink);font-variant-numeric:tabular-nums}
input[type=range]{width:100%}
.num{font-family:ui-monospace,Consolas,monospace;font-variant-numeric:tabular-nums}
.verdict{border-left:4px solid var(--bad);padding:6px 12px;margin:10px 0;background:var(--card)}
.verdict.ok{border-color:var(--ok)}
.legend span{display:inline-block;margin-right:16px;font-size:.88rem}
.legend i{display:inline-block;width:18px;height:3px;vertical-align:middle;margin-right:6px}
a{color:var(--ref)}
:focus-visible{outline:2px solid var(--ref);outline-offset:2px}