:root{--bg:#f2f5f3;--surface:#fbfcfb;--ink:#1c2a38;--muted:#566574;--line:#cdd7d2;--accent:#2457c5;--accent-ink:#fff;--hi:#ffe27a;--bad:#a32d2d;--good:#17653f}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){color-scheme:dark;--bg:#141b22;--surface:#1b242d;--ink:#e6ecf0;--muted:#9aa9b5;--line:#33424f;--accent:#7aa2ff;--accent-ink:#0e1620;--hi:#6b5a10;--bad:#ff9b9b;--good:#7fd8a6}}
:root[data-theme="dark"]{color-scheme:dark;--bg:#141b22;--surface:#1b242d;--ink:#e6ecf0;--muted:#9aa9b5;--line:#33424f;--accent:#7aa2ff;--accent-ink:#0e1620;--hi:#6b5a10;--bad:#ff9b9b;--good:#7fd8a6}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 Figtree,system-ui,sans-serif;
 background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:28px 28px;background-attachment:fixed}
a{color:var(--accent)}
main{max-width:780px;margin:0 auto;padding:28px 16px 48px}
h1{font:600 clamp(1.9rem,5vw,2.6rem)/1.15 Literata,Georgia,serif;margin:0 0 6px}
h2{font:600 1.2rem/1.3 Literata,Georgia,serif;margin:0 0 12px}
h3{font:600 1.05rem/1.3 Literata,Georgia,serif;margin:18px 0 6px}
.lead{color:var(--muted);margin:0 0 22px;max-width:62ch}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:18px;margin-bottom:18px}
label.f{display:flex;flex-direction:column;font-size:.85rem;color:var(--muted);gap:3px;margin-bottom:12px}
textarea,input[type=text],input[type=number],select{font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:7px 9px;width:100%}
textarea{font-family:Literata,Georgia,serif;font-size:1.1rem;line-height:1.6;resize:vertical}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:560px){.two{grid-template-columns:1fr}}
textarea:focus-visible,input:focus-visible,button:focus-visible,select:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btns{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:6px}
button.b{font:600 .95rem Figtree,sans-serif;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:8px 14px;border-radius:4px;cursor:pointer}
button.go{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.note{color:var(--muted);font-size:.9rem;margin:8px 0 0}
.err{color:var(--bad);margin:10px 0 0;white-space:pre-wrap}
.verdict{font-weight:600;margin:0 0 10px}.verdict.ok{color:var(--good)}.verdict.no{color:var(--bad)}
mark{background:var(--hi);color:inherit;border-radius:3px;padding:0 2px}
table.m{border-collapse:collapse;font:1.02rem Literata,serif}
table.m td{padding:3px 12px;text-align:right}table.m td.bar{border-left:2px solid var(--ink)}
table.m td.p{background:var(--hi);border-radius:3px}
.mat-wrap{overflow-x:auto}
.ok{color:var(--good)}

/* site chrome */
.site-head{background:var(--surface);border-bottom:1px solid var(--line)}
.site-head nav{max-width:780px;margin:0 auto;padding:10px 16px;display:flex;flex-wrap:wrap;align-items:center;gap:4px 16px}
.brand{font:600 1.1rem Literata,Georgia,serif;color:var(--ink);text-decoration:none;margin-right:auto}
.site-head nav a:not(.brand){color:var(--muted);text-decoration:none;font-weight:600;font-size:.92rem;padding:4px 0;border-bottom:2px solid transparent}
.site-head nav a[aria-current=page]{color:var(--ink);border-bottom-color:var(--accent)}
.site-head nav a:not(.brand):hover{color:var(--ink)}
.site-foot{border-top:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:.88rem}
.site-foot div{max-width:780px;margin:0 auto;padding:18px 16px;display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center}
.site-foot a{color:var(--muted)}
.site-foot .copy{margin-left:auto}

/* long-form content */
.prose{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:22px 22px 10px;margin-bottom:18px}
.prose p,.prose li{max-width:68ch}
.prose h2{margin-top:22px}.prose h2:first-child{margin-top:0}
.prose ol,.prose ul{padding-left:1.3rem}
.prose code,.prose .math{font-family:Literata,Georgia,serif;font-size:1.03em}
.prose pre{font:1.02rem/1.7 Literata,Georgia,serif;background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:10px 14px;overflow-x:auto}
.prose table.t{border-collapse:collapse;margin:8px 0 14px;font-size:.95rem}
.prose table.t th,.prose table.t td{border:1px solid var(--line);padding:5px 10px;text-align:left}
.prose details{border-top:1px solid var(--line);padding:10px 0}
.prose summary{font-weight:600;cursor:pointer}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-bottom:18px}
.card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:14px 16px;text-decoration:none;color:var(--ink)}
.card strong{font-family:Literata,Georgia,serif;display:block;margin-bottom:4px}
.card span{color:var(--muted);font-size:.9rem}
.card:hover{border-color:var(--accent)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;font:1.05rem/1.7 Literata,serif;margin:0}
.kv dt{color:var(--muted);font-family:Figtree,sans-serif;font-size:.92rem}
.kv dd{margin:0;font-weight:600}