:root{--ink:#1d1f21;--muted:#5b6066;--line:#d9dcdf;--bg:#f6f5f2;--accent:#b4532a;--max:1080px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--accent)}
a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:9}
header,main,footer{max-width:var(--max);margin:0 auto;padding:0 20px}
header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:18px;padding-bottom:18px;flex-wrap:wrap}
.brand{font-weight:700;font-size:20px;letter-spacing:.02em;color:var(--ink);text-decoration:none}
nav a{color:var(--ink);text-decoration:none;margin-left:18px;display:inline-block;padding:6px 0}
nav a:hover{text-decoration:underline}
h1{font-size:clamp(30px,5vw,46px);line-height:1.12;margin:28px 0 14px;max-width:16em}
h2{font-size:26px;margin:56px 0 14px}
h3{font-size:18px;margin:22px 0 6px}
.lede{font-size:19px;color:var(--muted);max-width:36em}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 30px}
.btn{display:inline-block;padding:12px 18px;border:2px solid var(--ink);border-radius:3px;text-decoration:none;color:var(--ink);font-weight:600;min-height:48px}
.btn.primary{background:var(--ink);color:#fff}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin:0}
.pair img{width:100%;height:auto;display:block;border:1px solid var(--line)}
figure{margin:0}
figcaption{font-size:14px;color:var(--muted);margin-top:6px}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.steps li{counter-increment:s;padding:14px 0 14px 46px;border-bottom:1px solid var(--line);position:relative}
.steps li::before{content:counter(s);position:absolute;left:0;top:12px;font-weight:700;font-size:22px;color:var(--accent)}
table{border-collapse:collapse;width:100%;max-width:640px;background:#fff}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line)}
td.num,th.num{text-align:right}
.note{font-size:15px;color:var(--muted)}
.limits li{margin:6px 0}
footer{margin-top:72px;padding-top:20px;padding-bottom:40px;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
footer a{color:var(--muted);margin-right:14px;display:inline-block;padding:4px 0}
.doc{max-width:720px}
.doc h2{font-size:22px;margin-top:36px}
code,kbd{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:15px;background:#ebe9e4;padding:1px 5px;border-radius:2px}
.box{background:#fff;border:1px solid var(--line);padding:18px 20px;max-width:640px}
@media (max-width:640px){nav a{margin-left:0;margin-right:14px}.pair{grid-template-columns:1fr}h2{margin-top:40px}}
.spaced{margin-top:28px}