:root{--bg:#FAFAF7;--card:#fff;--ink:#1d2433;--muted:#4d5566;--line:#d9dbe1;--accent:#1f6b57;--accent-ink:#fff;--soft:#eef5f2;--warn:#7a4b00}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
a{color:var(--accent)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #f2a900;outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.5rem 1rem;z-index:9}
.skip:focus{left:.5rem;top:.5rem}
.wrap{max-width:860px;margin:0 auto;padding:0 1rem}
header.site{border-bottom:1px solid var(--line);background:var(--card)}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem;padding-top:.7rem;padding-bottom:.7rem}
.brand{font-weight:700;color:var(--ink);text-decoration:none;font-size:1.05rem}
nav.top a{margin-left:1rem;text-decoration:none;font-weight:600}
nav.top a:first-child{margin-left:0}
main{padding:1.5rem 0 2.5rem}
h1{font-size:1.9rem;line-height:1.2;margin:.3rem 0 .6rem}
h2{font-size:1.35rem;line-height:1.3;margin:2rem 0 .6rem}
h3{font-size:1.1rem;margin:1.4rem 0 .4rem}
.lede{font-size:1.08rem;color:var(--muted)}
.tool{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem;margin:1.2rem 0}
.row{display:flex;flex-wrap:wrap;gap:.8rem;align-items:flex-end}
.field{display:flex;flex-direction:column;flex:1 1 180px;min-width:0}
label,.lbl{font-weight:600;font-size:.95rem;margin-bottom:.25rem}
input[type=text],input[type=number],select,textarea{font:inherit;color:inherit;background:#fff;border:1px solid #9aa1ad;border-radius:8px;padding:.55rem .6rem;width:100%;min-width:0}
textarea{min-height:11rem;resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92rem;line-height:1.45}
button{font:inherit;font-weight:600;border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);border-radius:8px;padding:.55rem 1rem;cursor:pointer}
button.ghost{background:#fff;color:var(--accent)}
fieldset{border:1px solid var(--line);border-radius:10px;padding:.6rem .8rem;margin:.8rem 0;min-width:0}
legend{font-weight:700;padding:0 .3rem}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:.25rem 1rem}
.opts label{font-weight:400;margin:0;display:flex;gap:.45rem;align-items:flex-start}
.opts input{margin-top:.35rem}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{border-bottom:1px solid var(--line);padding:.45rem .5rem;text-align:left;vertical-align:top}
th{background:var(--soft)}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.result{background:var(--soft);border-radius:10px;padding:.8rem;margin-top:.8rem}
.big{font-size:1.25rem;font-weight:700}
.note{font-size:.93rem;color:var(--muted)}
.warn{color:var(--warn)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem;margin:1.2rem 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem}
.card h2{margin-top:0;font-size:1.2rem}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em;background:#f0f1f4;padding:.05rem .3rem;border-radius:4px}
ol.refs{font-size:.92rem;padding-left:1.4rem}
ol.refs li{margin-bottom:.4rem;overflow-wrap:anywhere}
details{border:1px solid var(--line);border-radius:10px;padding:.5rem .8rem;margin:.5rem 0;background:var(--card)}
summary{font-weight:600;cursor:pointer}
.counts{font-size:.93rem;margin:.4rem 0 0;padding-left:1.2rem}
.btns{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.6rem}
footer.site{border-top:1px solid var(--line);background:var(--card);font-size:.92rem;color:var(--muted)}
footer.site .wrap{padding-top:1rem;padding-bottom:1.5rem}
footer.site a{margin-right:1rem}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media (max-width:480px){h1{font-size:1.55rem}body{font-size:16px}nav.top a{margin-left:.8rem}}
@media print{header.site,footer.site,.btns,nav{display:none}body{background:#fff}}
.opts-gap{margin-top:.4rem}
.field-narrow{max-width:280px}