:root{
  --bg:#FFFFFF; --surface:#F6F8FA; --ink:#0E1E2B; --muted:#52646F; --line:#D5DEE4;
  --brand:#0E3A5C; --brand-ink:#FFFFFF; --accent:#F2A900; --accent-ink:#2B1D00; --ok:#0B7A4B; --warn:#8A5A00;
  --radius:8px; color-scheme:light; --maxw:1040px;
  --font:"Avenir Next","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
:root[data-theme="dark"]{
  --bg:#0A141C; --surface:#101E29; --ink:#E7EEF3; --muted:#9CB0BD; --line:#223545;
  --brand:#7CC4F2; --brand-ink:#06202F; --accent:#F6B91F; --accent-ink:#241800; --ok:#4AD494; --warn:#E8B54E; color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--font)}
a{color:var(--brand)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.wrap{max-width:var(--maxw);margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
header.top{background:var(--brand);color:var(--brand-ink)}
header.top .wrap{display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;justify-content:space-between;padding-block:14px}
.logo{font-weight:800;font-size:1.25rem;letter-spacing:-.01em;color:inherit;text-decoration:none}
.logo b{background:var(--accent);color:var(--accent-ink);padding:1px 7px;border-radius:5px;margin-left:2px}
nav.main{display:flex;flex-wrap:wrap;gap:4px 18px;font-size:.95rem}
nav.main a{color:inherit;text-decoration:none;opacity:.92}
nav.main a:hover{text-decoration:underline;opacity:1}
main{padding-block:28px 56px}
.crumbs{font-size:.88rem;color:var(--muted);margin-bottom:12px}
.crumbs a{color:var(--muted)}
h1{font-size:clamp(1.7rem,4.5vw,2.5rem);line-height:1.12;letter-spacing:-.02em;margin:0 0 10px;text-wrap:balance}
h2{font-size:1.45rem;line-height:1.2;margin:40px 0 12px;letter-spacing:-.01em;text-wrap:balance}
h3{font-size:1.1rem;margin:24px 0 6px}
p{margin:0 0 14px;max-width:70ch}
.lead{font-size:1.12rem;color:var(--muted);max-width:62ch}
ul,ol{max-width:70ch;padding-left:1.3em}
li{margin-bottom:6px}
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;margin-top:20px}
@media (max-width:820px){.calc{grid-template-columns:minmax(0,1fr)}}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;min-width:0}
.panel h2{margin:0 0 14px;font-size:1.15rem}
.field{display:flex;flex-direction:column;gap:5px;margin-bottom:14px}
.field label{font-weight:600;font-size:.95rem}
.field .hint{font-size:.85rem;color:var(--muted)}
input[type=number],input[type=date],select{font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--ink);width:100%;min-width:0}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.result{border-color:var(--brand);border-width:2px}
.big{font-size:clamp(2rem,6vw,2.8rem);font-weight:800;letter-spacing:-.02em;line-height:1.1;color:var(--brand)}
.big small{font-size:1rem;font-weight:500;color:var(--muted)}
table.bd{width:100%;border-collapse:collapse;margin-top:12px;font-size:.96rem}
table.bd td{padding:8px 0;border-bottom:1px solid var(--line);vertical-align:top}
table.bd td:last-child{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap;padding-left:12px}
table.bd tr.tot td{font-weight:800;border-bottom:0;padding-top:12px}
.tablewrap{overflow-x:auto;margin:12px 0 20px}
table.data{border-collapse:collapse;min-width:420px;font-size:.95rem}
table.data th,table.data td{border:1px solid var(--line);padding:8px 12px;text-align:left}
table.data th{background:var(--surface)}
.note{font-size:.88rem;color:var(--muted)}
.alert{background:var(--surface);border-left:4px solid var(--accent);padding:12px 16px;border-radius:4px;font-size:.93rem;margin:16px 0;max-width:70ch}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-top:20px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;gap:6px}
.card:hover{border-color:var(--brand)}
.card strong{font-size:1.1rem;color:var(--brand)}
.card span{color:var(--muted);font-size:.93rem}
details{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px 16px;margin-bottom:10px;max-width:70ch}
summary{cursor:pointer;font-weight:600}
details p{margin:10px 0 0}
footer.bottom{background:var(--surface);border-top:1px solid var(--line);padding-block:28px;font-size:.9rem;color:var(--muted)}
footer.bottom .wrap{display:flex;flex-direction:column;gap:10px}
footer.bottom nav{display:flex;flex-wrap:wrap;gap:6px 18px}
.btn{font:inherit;font-weight:700;background:var(--accent);color:var(--accent-ink);border:0;border-radius:6px;padding:11px 18px;cursor:pointer}
.theme{font:inherit;font-size:.85rem;background:transparent;color:inherit;border:1px solid currentColor;border-radius:99px;padding:4px 12px;cursor:pointer;opacity:.9}
.theme:hover{opacity:1}