:root{--bg:#eef1f6;--card:#fff;--ink:#1d2540;--muted:#5d6785;--line:#d5dbe8;--pen:#d63a2f;--good:#1f8a5b;--btn:#1d2540;--btn-ink:#fff;--soft:#e4e9f3}
@media(prefers-color-scheme:dark){:root{--bg:#121626;--card:#1b2138;--ink:#e8ecf8;--muted:#9aa4c4;--line:#2c3556;--pen:#ff6b5e;--good:#4fd39b;--btn:#e8ecf8;--btn-ink:#121626;--soft:#242c4a}}
*{box-sizing:border-box}html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:16px/1.6 Georgia,"Palatino Linotype",serif;padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}
a{color:var(--pen)}
.wrap{max-width:680px;margin:0 auto;padding:0 18px}
header.site{border-bottom:1px solid var(--line);background:var(--card)}
header.site .wrap{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding-top:12px;padding-bottom:12px}
.brand{font:800 1.3rem system-ui,sans-serif;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
nav a{font:600 .95rem system-ui,sans-serif;color:var(--muted);text-decoration:none;margin-left:14px}
nav a:hover,nav a[aria-current]{color:var(--ink);text-decoration:underline;text-decoration-color:var(--pen);text-underline-offset:5px}
main{padding:28px 0 48px}
h1{font-size:2.1rem;margin:0 0 6px;letter-spacing:-.02em;line-height:1.2}
h2{font-size:1.3rem;margin:30px 0 8px}
.tag{color:var(--muted);margin:0 0 22px}
.paper{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px}
.fields{display:grid;grid-template-columns:1fr 1fr;gap:14px}
label{display:block;font:600 .9rem system-ui,sans-serif;margin-bottom:6px}
input[type=number]{width:100%;font:700 1.6rem system-ui,sans-serif;padding:10px 12px;border:2px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink)}
input:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--pen);outline-offset:2px}
.score{text-align:center;margin:22px 0 6px}
.pct{font:800 clamp(4rem,18vw,6.5rem)/1 system-ui,sans-serif;color:var(--pen);letter-spacing:-.04em}
.pct.perfect{color:var(--good)}
.letter{font:700 1.2rem system-ui,sans-serif;margin-top:6px}
.frac{color:var(--muted);font:1rem system-ui,sans-serif}
.row{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
button{font:700 1rem system-ui,sans-serif;padding:12px 18px;border-radius:8px;border:2px solid var(--btn);background:var(--btn);color:var(--btn-ink);cursor:pointer;flex:1;min-width:120px}
button.ghost{background:transparent;color:var(--ink)}
.opts{display:flex;gap:18px;flex-wrap:wrap;margin-top:18px;font:.95rem system-ui,sans-serif}
.chk{display:flex;align-items:center;gap:8px;cursor:pointer;margin:0;font-weight:500}
.chk input{width:18px;height:18px}
.tips{color:var(--muted);font-size:.92rem;margin:20px 0 0}
kbd{font:700 .85rem system-ui,sans-serif;background:var(--soft);border:1px solid var(--line);border-radius:4px;padding:1px 6px}
#chart{margin-top:20px;max-height:420px;overflow:auto;border:1px solid var(--line);border-radius:8px}
table{border-collapse:collapse;width:100%;font:.95rem system-ui,sans-serif}
th,td{padding:8px 12px;text-align:center;border-bottom:1px solid var(--line)}
th{position:sticky;top:0;background:var(--soft)}
tr.hit td{background:var(--soft);font-weight:700}
details{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin:10px 0}
summary{font:600 1rem system-ui,sans-serif;cursor:pointer}
details p{margin:10px 0 0}
.fieldrow{display:flex;gap:10px;align-items:end;flex-wrap:wrap}
.fieldrow>div{flex:1;min-width:130px}
footer.site{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font:.88rem system-ui,sans-serif;text-align:center}
footer.site a{color:var(--muted);margin:0 8px}
[hidden]{display:none!important}
@media(max-width:420px){.fields{grid-template-columns:1fr}nav a{margin:0 12px 0 0}}
@media print{header.site,footer.site,.row,.opts,.tips{display:none}}

.content-section{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:28px;margin:28px 0 40px;font-family:system-ui,sans-serif}
.content-section h2{font-size:1.35rem;margin-top:0;margin-bottom:10px;letter-spacing:-.02em}
.content-section p{color:var(--muted)}
.content-section li{margin:8px 0}
.paper{box-shadow:0 12px 30px rgba(0,0,0,.06)}

/* ---- Inner pages (legal, about, contact) ---- */
header.site .wrap,footer.site .wrap{max-width:1080px}
body.page main .wrap{max-width:760px}
.doc h1{margin-bottom:8px}
.doc h2{font:700 1.2rem system-ui,sans-serif;margin:34px 0 8px;letter-spacing:-.01em}
.doc p,.doc li{line-height:1.7}.doc ul{padding-left:22px}.doc li{margin:6px 0}
.updated{font:.9rem system-ui,sans-serif;color:var(--muted);margin:0 0 24px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.lead{font-size:1.2rem;color:var(--muted);margin:0 0 8px}
.summary{background:var(--soft);border-left:4px solid var(--pen);padding:14px 18px;border-radius:4px}
.note{font-size:.92rem;color:var(--muted)}
.contact{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px;margin:22px 0 8px}
.field{margin-bottom:16px}
.contact input[type=text],.contact input[type=email],.contact select,.contact textarea{width:100%;font:1rem system-ui,sans-serif;padding:11px 12px;border:2px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink)}
.contact textarea{resize:vertical;min-height:130px}
.contact input:focus-visible,.contact select:focus-visible,.contact textarea:focus-visible{outline:3px solid var(--pen);outline-offset:2px}
.contact button{width:100%}
@media(max-width:420px){nav a{margin:0 12px 0 0}}