:root{--fg:#1b1f24;--muted:#5b6470;--bg:#fff;--soft:#f4f6f8;--line:#dde2e7;--acc:#0b5cad;--warn:#fff6db;--warnb:#e6c65c}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--fg);background:var(--bg)}
a{color:var(--acc)}
.wrap{max-width:780px;margin:0 auto;padding:0 18px}
header.site{border-bottom:1px solid var(--line);background:#fff}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;padding-top:12px;padding-bottom:12px}
.brand{font-weight:800;text-decoration:none;color:var(--fg);font-size:1.15rem}
nav a{margin-left:14px;text-decoration:none;font-size:.95rem}
nav a:first-child{margin-left:0}
main{padding:24px 0 40px}
h1{font-size:1.75rem;line-height:1.25;margin:.2em 0 .4em}
h2{font-size:1.3rem;margin-top:1.8em}
h3{font-size:1.08rem;margin-top:1.4em}
.meta{color:var(--muted);font-size:.9rem}
.aff{background:var(--warn);border:1px solid var(--warnb);border-radius:8px;padding:10px 14px;font-size:.92rem;margin:14px 0}
.box{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:18px 0}
.tldr{border-left:4px solid var(--acc)}
table{border-collapse:collapse;width:100%;font-size:.93rem;margin:10px 0}
th,td{border:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}
th{background:var(--soft)}
.tbl{overflow-x:auto}
form.calc label{display:block;font-weight:600;margin-top:12px}
form.calc input{width:100%;font-size:1rem;padding:9px 10px;border:1px solid #b9c2cc;border-radius:8px}
form.calc small{color:var(--muted);display:block;font-weight:400}
button{margin-top:14px;font-size:1rem;padding:10px 16px;border:0;border-radius:8px;background:var(--acc);color:#fff;cursor:pointer}
#res{margin-top:16px}
.ok{color:#11733a;font-weight:700}.bad{color:#a4281b;font-weight:700}
footer.site{border-top:1px solid var(--line);color:var(--muted);font-size:.88rem;padding:18px 0 30px}
footer.site a{color:var(--muted)}
.src li{margin-bottom:6px;word-break:break-word}
code{background:var(--soft);padding:1px 4px;border-radius:4px}