/* Shared styles for simulations */
:root{--bg:#f6f5f1;--panel:#fff;--ink:#1d2330;--muted:#6b7280;--line:#e4e2dc;--hl:#fff6d9}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);font:14px/1.45 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.app{display:grid;grid-template-columns:1fr 340px;grid-template-rows:auto 1fr;height:100vh}
header{grid-column:1/-1;display:flex;align-items:center;gap:12px 14px;flex-wrap:wrap;padding:10px 16px;border-bottom:1px solid var(--line);background:var(--panel)}
header h1{font-size:17px;margin:0 6px 0 0;font-weight:650}
header .hint{flex:1 1 auto}
.tabs{display:flex;gap:4px;background:#efede7;padding:3px;border-radius:10px;flex-wrap:wrap}
.tabs:empty{display:none}
.tab{border:0;background:transparent;padding:7px 12px;border-radius:8px;font:inherit;cursor:pointer;color:#3c4250}
.tab.on{background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.08);font-weight:600;color:var(--ink)}
.stage{position:relative;min-height:0;overflow:hidden;background:#fbfaf7}
.stage canvas{display:block;width:100%;height:100%;touch-action:none}
aside{border-left:1px solid var(--line);background:var(--panel);overflow:auto;padding:14px 16px}
aside h2{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:16px 0 8px;font-weight:600}
aside h2:first-child{margin-top:0}
.btn{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:8px;padding:7px 11px;font:inherit;cursor:pointer}
.btn:hover:not(:disabled){background:#f1f0ec}
.btn:disabled{opacity:.45;cursor:default}
.btn.primary{background:linear-gradient(135deg,#7c6cff,#4f8cff);color:#fff;border-color:transparent}
.btn.primary:hover:not(:disabled){filter:brightness(1.1)}
select.btn{width:100%}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.ctl{margin-top:6px}
.ctl input[type=range]{width:100%}
.slab{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.slab b{font-variant-numeric:tabular-nums;font-size:15px;white-space:nowrap}
.read{display:grid;grid-template-columns:1fr auto;gap:4px 12px;font-variant-numeric:tabular-nums}
.read .k{color:var(--muted)} .read .v{font-weight:700;text-align:right}
.eq{background:#f7f6f2;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-family:Georgia,serif;font-size:14.5px;line-height:1.85;overflow-x:auto}
.explain{background:var(--hl);border:1px solid #f0e3b4;border-radius:10px;padding:10px 12px;margin:0}
.key{border-left:3px solid var(--ink);padding:2px 0 2px 10px;margin:0;color:#2c3240}
label.tog{display:flex;align-items:center;gap:8px;padding:2px 0;cursor:pointer}
.hint{color:var(--muted);font-size:12.5px}
.sw{display:inline-block;width:14px;height:3px;vertical-align:middle;margin-right:6px;border-radius:2px}
.pill{display:inline-block;border-radius:999px;padding:3px 11px;font-weight:650;font-size:12.5px;background:#f1f0ec;margin:0 4px 4px 0}
@media (max-width:880px){
  .app{grid-template-columns:1fr;grid-template-rows:auto 52vh auto;height:auto}
  aside{border-left:none;border-top:1px solid var(--line)}
}
@media print{aside,.tabs{display:none!important}.app{display:block;height:auto}.stage{height:150mm}}