:root{--ink:#111827;--muted:#4b5563;--line:#d6d3cc;--bg:#f7f5f0;--card:#fff;--brand:#1a4480;--brand-dk:#162e51;--brand-lt:#e8f0fa;--brand-ink:#fff;--bad:#b42318;--bad-bg:#fdecec;--warn:#8a4b00;--warn-bg:#fdf0e1;--good:#1b6b3a;--good-bg:#e8f6ee;--r:14px}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;color:var(--ink);background:var(--bg)}
a{color:var(--brand)}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.hero{background:linear-gradient(160deg,#eef4fb 0%,#dbe7f5 100%);color:var(--ink);padding:44px 0 48px;border-bottom:1px solid #c9d8ea}
.tooltag{margin:0 0 14px;font-size:.85em;color:#374151}
.tooltag strong{color:var(--brand)}
.eyebrow{text-transform:uppercase;font-size:.8em;letter-spacing:1.2px;color:var(--brand);margin:0 0 8px;font-weight:800}
.hero h1{font-size:clamp(1.6em,3.6vw,2.4em);line-height:1.2;margin:0 0 16px;max-width:900px;letter-spacing:-.01em}
.lede{font-size:1.05em;max-width:800px;color:#374151;margin:0 0 20px}
.facts{display:flex;gap:10px;flex-wrap:wrap;list-style:none;padding:0;margin:0}
.facts li{background:#fff;border:1px solid #c9d8ea;border-radius:999px;padding:6px 16px;font-size:.85em;color:var(--ink)}
.grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:24px;margin-top:32px;align-items:start}
@media (max-width:1060px){.grid{grid-template-columns:minmax(0,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:0 6px 24px rgba(14,26,43,.06)}
.result{min-height:220px}
fieldset{border:0;padding:0;margin:0 0 18px}
legend,summary{font-weight:800;font-size:1.062em;margin-bottom:10px;padding:0}
summary{cursor:pointer}
.card-inner{border-top:1px solid var(--line);padding-top:16px;margin:0 0 18px}
.cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 14px}
@media (max-width:560px){.cols{grid-template-columns:1fr}}
label{display:flex;flex-direction:column;gap:5px;font-size:0.875em;font-weight:600;color:var(--ink)}
input,select{font:inherit;padding:10px 12px;border:2px solid #8a94a6;border-radius:10px;background:#fff;color:var(--ink);min-height:52px;width:100%}
input:focus-visible,select:focus-visible{outline:4px solid #f59e0b;outline-offset:2px;border-color:var(--brand)}
input[aria-invalid=true]{border-color:var(--bad)}
.err{color:var(--bad);font-size:0.812em;font-weight:600}
label.check{flex-direction:row;align-items:flex-start;gap:10px;font-weight:500;margin:10px 0}
label.check input{width:26px;height:26px;min-height:0;margin-top:2px;flex:none}
.hint{font-size:0.812em;color:var(--muted);margin:-4px 0 10px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:inherit;font-weight:700;border-radius:10px;border:2px solid var(--brand);background:#fff;color:var(--brand);padding:12px 18px;min-height:56px;cursor:pointer;text-decoration:none}
.btn.primary{background:var(--brand);border-color:var(--brand);color:var(--brand-ink)}
.btn.primary:hover{background:var(--brand-dk);border-color:var(--brand-dk)}
#run{width:100%;font-size:1.062em}
.fine{font-size:0.781em;color:var(--muted)}
.empty h2{margin-top:0}
.verdict{border-radius:12px;padding:16px 18px;margin-bottom:14px}
.verdict h2{margin:2px 0 6px;font-size:clamp(1.3em,2.4vw,1.6em);line-height:1.25}
.verdict p{margin:0}
.kicker{font-size:0.75em;text-transform:uppercase;letter-spacing:1.2px;font-weight:700;opacity:.8}
.verdict.bad{background:var(--bad-bg);color:#5d0f0f}
.verdict.warn{background:var(--warn-bg);color:#4d2e00}
.verdict.good{background:var(--good-bg);color:#0b3d1d}
.nums{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:0 0 16px}
.nums div{background:var(--bg);border-radius:10px;padding:10px 12px}
.nums dt{font-size:0.781em;color:var(--muted)}
.nums dd{margin:0;font-weight:800;font-size:1.125em}
.rescue{border:2px solid var(--brand);border-radius:12px;padding:16px}
.rescue h3{margin:0 0 6px}
.big:not(html){font-size:1.062em}
.lock{background:var(--brand-lt);border-radius:10px;padding:14px;margin-top:10px}
.lock .btn.primary{width:100%;margin:6px 0 10px}
.keyrow{display:flex;gap:8px}
.keyrow input{flex:1}
.moves{width:100%;border-collapse:collapse;margin:10px 0;font-size:0.906em}
.moves th,.moves td{border-bottom:1px solid var(--line);padding:9px 6px;text-align:left;vertical-align:top}
.moves .amt{text-align:right;font-weight:800;white-space:nowrap}
.why{font-size:0.781em;color:var(--muted);font-weight:400}
.note{border-radius:12px;padding:14px 16px;background:var(--bad-bg)}
.note.warn{background:var(--warn-bg)}
.note.good{background:var(--good-bg)}
.note h3{margin:0 0 6px}
.ws{margin:8px 0 12px}
.explain{margin:40px auto}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:800px){.three{grid-template-columns:1fr}}
.three div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}
.three h3{margin:0 0 6px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media print{
  .top,.hero,form,.explain,.foot,.lock,#print{display:none!important}
  body{background:#fff}
  .grid{display:block;margin:0}
  .result{position:static;box-shadow:none;border:0}
  details{display:block}
  details>summary{list-style:none}
}
.pill{display:inline-block;background:var(--brand-lt);color:var(--brand-dk);border-radius:999px;padding:1px 10px;font-size:.7em;font-weight:700;letter-spacing:.4px;margin-left:6px;text-transform:uppercase}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.cols3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px 12px}
@media (max-width:560px){.cols3{grid-template-columns:1fr}}
.yrow{border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:0 0 10px;background:#fff}
.ylabel{margin:0 0 8px}
label.check.small{font-size:0.844em;margin:8px 0 0}
label.check.inline{align-self:end;margin:0 0 10px}
.ticks{padding-left:20px;margin:8px 0 12px}
.ticks li{margin:4px 0}
.steps td.entry{font-size:0.906em}
.steps td:first-child{white-space:nowrap}
h4{margin:16px 0 4px}
.callout{background:var(--brand-lt);border-left:4px solid var(--brand);padding:10px 12px;border-radius:8px}
.letter{white-space:pre-wrap;font:13.5px/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px;margin:8px 0;overflow-wrap:anywhere}
.btn.small{min-height:48px;padding:8px 14px;font-size:0.875em}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
@media print{.actions,.copy{display:none!important}.letter{border:0;background:#fff}}
.modes{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 18px}
.modes label{flex-direction:row;align-items:flex-start;gap:10px;border:2px solid var(--line);border-radius:12px;padding:12px 14px;cursor:pointer;font-weight:700}
.modes label span{display:block}
.modes label small{display:block;font-weight:500;color:var(--muted);font-size:0.812em}
.modes input{width:26px;height:26px;min-height:0;margin-top:3px;flex:none}
.modes label:has(input:checked){border-color:var(--brand);background:var(--brand-lt)}
@media (max-width:560px){.modes{grid-template-columns:1fr}}
.range{display:grid;grid-template-columns:1fr 1fr auto;gap:10px;align-items:end;margin:0 0 8px}
.range .btn{min-height:52px;padding:8px 12px}
.timeline{list-style:none;padding:0;margin:10px 0 14px;border-left:3px solid var(--brand)}
.timeline li{margin:0 0 10px;padding-left:14px;position:relative}
.timeline li::before{content:"";position:absolute;left:-8px;top:7px;width:12px;height:12px;border-radius:50%;background:var(--brand)}
.timeline .when{font-weight:800}
.suite{background:#162e51;color:#dbe4ef;border-radius:14px;padding:22px 24px;margin:0 auto 30px}
.suite h2{margin:0 0 6px;color:#fff;font-size:1.188em}
.suite .three div{background:#1f3d66;border-color:#2f4a70;color:#dbe4ef}
.suite a{color:#97c4f0;font-weight:700}

/* Letter Desk shell fit: larger type (20px / 24px) */
.partof{margin:0 auto 24px}
.partof .fine{font-size:.875em}
.keyrow{flex-wrap:wrap}
.keyrow .btn{flex:none}
@media (max-width:560px){.pair{grid-template-columns:1fr}.range{grid-template-columns:1fr 1fr}.range .btn{grid-column:1/-1}}
@media (max-width:480px){.nums{grid-template-columns:1fr}.wrap{padding:0 16px}.card{padding:18px}}
.moves th{white-space:nowrap}
@media (max-width:560px){.modes{grid-template-columns:minmax(0,1fr)}.modes label{min-width:0;overflow-wrap:anywhere}}
label{min-width:0}select{min-width:0;max-width:100%}