:root{--bg:#f7f8f7;--surface:#fff;--text:#1c2321;--muted:#5b6662;--line:#dfe4e2;--accent:#0f766e;--accent-soft:#e3f2ef;--result:#0b5d56;--radius:12px}
@media (prefers-color-scheme:dark){:root{--bg:#111615;--surface:#1a2120;--text:#e6ecea;--muted:#9aa7a3;--line:#2c3634;--accent:#3cb4a6;--accent-soft:#1c3330;--result:#7fd8cc}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent)}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}
.site-header{background:var(--surface);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-weight:700;font-size:1.15rem;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:8px}
.logo-mark{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--accent);color:#fff}
.site-header nav a{text-decoration:none;font-weight:500}
main{padding:24px 16px 40px}
h1{font-size:clamp(1.6rem,4vw,2.2rem);line-height:1.2;margin:.3em 0 .4em}
h2{font-size:1.3rem;margin:1.8em 0 .5em}
h3{font-size:1.05rem;margin:1.4em 0 .4em}
.lede{font-size:1.1rem;color:var(--muted);margin-top:0}
.crumbs{font-size:.9rem;color:var(--muted)}
.crumbs a{color:var(--muted)}
.hero{padding:16px 0 8px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;text-decoration:none;color:var(--text);transition:border-color .15s,transform .15s}
.card:hover{border-color:var(--accent);transform:translateY(-1px)}
.card strong{display:block;margin-bottom:4px;color:var(--accent)}
.card span{font-size:.92rem;color:var(--muted)}
.calc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin:20px 0}
.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px 18px}
.field label,.field legend{display:block;font-weight:600;font-size:.92rem;margin-bottom:4px}
.field small{display:block;color:var(--muted);font-size:.82rem;margin-top:3px}
input,select{width:100%;font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--text)}
input:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}
.check{display:flex;align-items:center;gap:8px;font-weight:500}
.check input{width:auto}
fieldset{border:0;padding:0;margin:0}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg label{flex:1;min-width:max-content;text-align:center;padding:8px 10px;border:1px solid var(--line);border-radius:8px;cursor:pointer;font-weight:500;font-size:.92rem;margin:0}
.seg input{position:absolute;opacity:0;width:1px;height:1px}
.seg input:checked+span{color:var(--accent)}
.seg label:has(input:checked){border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.seg input:focus-visible+span{outline:2px solid var(--accent);outline-offset:2px}
.results{margin-top:20px;padding-top:18px;border-top:1px solid var(--line)}
.big{font-size:clamp(1.8rem,6vw,2.4rem);font-weight:700;color:var(--result);line-height:1.1}
.big-label{color:var(--muted);font-size:.92rem}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:14px}
.stat{background:var(--accent-soft);border-radius:10px;padding:10px 12px}
.stat b{display:block;font-size:1.15rem}
.stat span{font-size:.85rem;color:var(--muted)}
.table-wrap{overflow-x:auto;margin-top:14px}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
th,td{text-align:right;padding:8px 10px;border-bottom:1px solid var(--line);white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{font-size:.85rem;color:var(--muted);font-weight:600}
tr.total td{font-weight:700;color:var(--result);border-bottom:0}
.note{font-size:.88rem;color:var(--muted)}
.warn{background:#fff4e0;color:#6b4300;border-radius:8px;padding:10px 12px;font-size:.92rem}
@media (prefers-color-scheme:dark){.warn{background:#3a2c12;color:#f3d39b}}
.prose,.article{max-width:720px}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:8px 0}
.faq summary{font-weight:600;cursor:pointer}
.faq details p{margin:.6em 0 0}
.related ul{columns:2;padding-left:18px}
@media (max-width:560px){.related ul{columns:1}}
.updated{font-size:.85rem;color:var(--muted);margin-top:28px}
.site-footer{border-top:1px solid var(--line);background:var(--surface);font-size:.9rem;color:var(--muted);padding:12px 0}
.calc-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:18px}
.calc-btn{font:inherit;font-weight:600;font-size:1.05rem;padding:12px 28px;border:0;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer}
.calc-btn:hover{filter:brightness(1.1)}
.calc-btn:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media (max-width:560px){.calc-btn{width:100%}}
@keyframes flash{from{background:var(--accent-soft)}to{background:transparent}}
.results.flash{animation:flash 1s ease-out;border-radius:8px}