:root{--success:#006B2E;--bg:#fff;--tape:#F2F2F2;--text:#000;--muted:#3D3D3D;--dg:#fff;--dgf:#000;--dgb:2px solid #000;--op:#1A1A1A;--opf:#fff;--unit:#FFD400;--fn:#E6E6E6;--fnf:#000;--eq:#003FA3;--eqf:#fff;--clr:#A30015;--clrf:#fff;--focus:#003FA3;--err:#B00020}@media (prefers-color-scheme:dark){:root{--success:#4ADE80;--bg:#000;--tape:#0D0D0D;--text:#fff;--muted:#BDBDBD;--dg:#1E1E1E;--dgf:#fff;--dgb:1px solid #3A3A3A;--op:#2E2E2E;--opf:#FFD400;--fn:#141414;--fnf:#E6E6E6;--eq:#4D8DFF;--eqf:#000;--clr:#FF5A5F;--clrf:#000;--focus:#4D8DFF;--err:#FF6B6B}}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font:500 17px system-ui,sans-serif;overscroll-behavior:none}#app{display:flex;flex-direction:column;height:100dvh;padding:env(safe-area-inset-top) 8px env(safe-area-inset-bottom);max-width:600px;margin:0 auto}#tape{flex:1;min-height:96px;overflow-y:auto;background:var(--tape);font:500 18px/24px ui-monospace,Menlo,monospace;padding:8px 12px;text-align:right;font-variant-numeric:tabular-nums;border-radius:6px;margin-top:8px}#tape .res{font-weight:700}#display{padding:6px 4px}#chips{display:flex;gap:6px;flex-wrap:wrap}.chip{font:600 14px/18px system-ui;border:1.5px solid var(--text);background:none;color:var(--text);border-radius:4px;padding:2px 6px}#main{text-align:right;font:700 40px/48px ui-monospace,Menlo,monospace;white-space:nowrap;overflow:hidden;font-variant-numeric:tabular-nums}#secondary{text-align:right;min-height:20px;color:var(--muted);font:500 16px/20px ui-monospace,monospace}#secondary.err{color:var(--err)}#keys{display:grid;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(3,minmax(48px,1fr)) repeat(5,minmax(56px,1.2fr));gap:6px;padding-bottom:8px;height:min(66vh,600px)}.key{border:none;border-radius:8px;font:600 28px system-ui;touch-action:manipulation;user-select:none;position:relative;padding:0}.key:active{filter:brightness(.8)}.digit{background:var(--dg);color:var(--dgf);border:var(--dgb)}.op{background:var(--op);color:var(--opf);font-size:30px}.op.pending{outline:3px solid var(--focus);outline-offset:-3px}.unit{background:var(--unit);color:#000;font:700 20px system-ui}.fn{background:var(--fn);color:var(--fnf);font:700 16px system-ui}.locked:after{content:"🔒";position:absolute;top:2px;right:4px;font-size:10px}.eq{background:var(--eq);color:var(--eqf);font-size:30px}.clear{background:var(--clr);color:var(--clrf);font:700 20px system-ui}.span2{grid-column:span 2}.row3{grid-row:span 3}#sheet{position:fixed;inset:0;background:#0000008c;display:flex;align-items:flex-end;justify-content:center}#sheet[hidden]{display:none}#sheet .card{background:var(--bg);color:var(--text);padding:24px;border-radius:12px 12px 0 0;max-width:600px;width:100%}#sheet button{width:100%;height:56px;font:700 18px system-ui;border-radius:8px;border:2px solid var(--text);background:none;color:var(--text)}.chip.pro{margin-left:auto;position:relative;font-weight:600}.chip.pro:before{content:"";position:absolute;inset:-8px}.chip.pro.on{font-weight:700;background:var(--unit);color:#000;border-color:#000}#sheet .card{display:flex;flex-direction:column;gap:10px;max-height:90dvh;overflow:auto}#sheet h2{margin:0;font:700 24px/30px system-ui}#sheet h2.ok{color:var(--success);text-align:center;flex:1}#sheet p{margin:0;font:500 17px/24px system-ui}#sheet p.fine{font-size:14px;color:var(--muted)}#sheet p.err{color:var(--err);min-height:0}#sheet p.err:empty{display:none}#sheet button.primary{background:var(--eq);color:var(--eqf);border:none}#sheet button.primary small{font:600 14px system-ui;opacity:.9}#sheet button.link{border:none;height:44px;text-decoration:underline}#sheet input{height:56px;font:600 20px system-ui;padding:0 12px;border:2px solid var(--text);border-radius:8px;background:var(--bg);color:var(--text)}#stage-banner{position:fixed;top:0;left:0;right:0;z-index:10;background:#b00020;color:#fff;font:700 11px/16px system-ui;text-align:center;letter-spacing:.05em;pointer-events:none}#mainrow{display:flex;align-items:baseline;gap:8px}#main-label{font:600 16px system-ui;color:var(--muted)}#mainrow #main{flex:1}#sheet .card{gap:12px;padding:16px 24px calc(24px + env(safe-area-inset-bottom))}#sheet .grab{width:36px;height:4px;border-radius:2px;background:var(--muted);align-self:center}#sheet .head{display:flex;align-items:center;gap:4px}#sheet .head h2{flex:1}#sheet .head h2:focus{outline:none}#sheet button.x{width:48px;height:48px;flex:none;border:none;font-size:24px;padding:0}#sheet button.secondary{background:none}#sheet button[disabled]{background:var(--fn);color:var(--muted);border:2px dashed var(--muted)}#sheet button.link{height:48px;text-align:left;padding:0;font-weight:600}#sheet button.link[disabled]{background:none;border:none;text-decoration:none}#sheet button:focus-visible,#sheet input:focus-visible,#sheet .plan:has(:focus-visible){outline:3px solid var(--focus);outline-offset:2px}#sheet .spin{display:inline-block;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion:reduce){#sheet .spin{animation:none}}#sheet p.err{font:600 15px/20px system-ui}#sheet p.terms{font:500 15px/22px system-ui}#sheet p.center,#sheet .center{text-align:center}#sheet p.addr{font-weight:700;word-break:break-all}#sheet .lbl{font:600 15px/20px system-ui;margin-bottom:-6px}#sheet input[aria-invalid]{border:3px solid var(--err)}#sheet input.code{font:700 28px ui-monospace,monospace;letter-spacing:.4em;text-align:center}#sheet ul.ticks{margin:0;padding:0;list-style:none;display:grid;gap:4px}#sheet ul.ticks li:before{content:"✓ ";color:var(--success);font-weight:700}#sheet .plans{display:grid;gap:8px}#sheet .plan{display:grid;grid-template-columns:24px 1fr auto;align-items:center;gap:12px;min-height:72px;padding:12px 16px;border:2px solid var(--text);border-radius:8px}#sheet .plan input{position:absolute;opacity:0;width:1px;height:1px}#sheet .plan .dot{width:22px;height:22px;border-radius:50%;border:2px solid var(--text)}#sheet .plan:has(:checked){border:3px solid var(--focus);padding:11px 15px}#sheet .plan:has(:checked) .dot{background:radial-gradient(circle,var(--focus) 0 6px,transparent 7px)}#sheet .pn{font:700 18px/22px system-ui;display:flex;flex-direction:column}#sheet .pn small{font:500 14px/20px system-ui;color:var(--muted)}#sheet .pp{font:700 20px system-ui;font-variant-numeric:tabular-nums}#sheet .okmark{width:72px;height:72px;border-radius:50%;border:3px solid var(--success);color:var(--success);font:700 44px/66px system-ui;text-align:center;align-self:center}#sheet dl.summary{display:grid;grid-template-columns:auto 1fr;gap:4px 16px;margin:0;padding:12px 16px;border:2px solid var(--text);border-radius:8px}#sheet dl.summary dt{color:var(--muted);font:500 15px/24px system-ui}#sheet dl.summary dd{margin:0;text-align:right;font:700 17px/24px system-ui;font-variant-numeric:tabular-nums}#tape dl.solve{margin:6px 0;padding:6px 0 6px 12px;border-left:2px solid var(--text);text-align:left}#tape .solve .sh{font:700 14px/18px system-ui;color:var(--muted);letter-spacing:.05em}#tape .solve .sr{display:flex;justify-content:space-between;align-items:center;min-height:32px;gap:12px}#tape .solve .sr dt{font:500 16px system-ui;color:var(--muted)}#tape .solve .sr dd{margin:0;font-weight:700;white-space:nowrap}#tape .solve .sr.key{border-left:3px solid var(--text);margin-left:-15px;padding-left:12px}#tape .solve .sr.key dt{color:var(--text);font-weight:700}#tape .solve .sr.chk{justify-content:flex-start;gap:8px;flex-wrap:wrap}#tape .solve .chk span{font:600 15px/20px system-ui;border:1.5px solid;border-radius:4px;padding:4px 6px}#tape .solve .chk .ok{color:var(--success)}#tape .solve .chk .bad{color:var(--err)}#tape .solve .sn{font:500 14px/20px system-ui;color:var(--muted)}.unit{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px}.unit .sym{font:800 24px/24px system-ui;pointer-events:none}.unit .word{font:700 14px/1 system-ui;letter-spacing:.03em;pointer-events:none}.unit:active{transform:scale(.96)}.fn.stack{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:6px 4px}.fn.stack .sym,.fn.stack .word{font:700 15px/16px system-ui;pointer-events:none}.chip.help{width:32px;border-radius:50%;font:700 18px/26px system-ui;padding:0;position:relative}.chip.help:before{content:"";position:absolute;inset:-8px}.chip.help.hint{outline:2px solid var(--focus);outline-offset:2px}.key,.chip{-webkit-touch-callout:none;user-select:none}.key.tipping{outline:3px solid var(--focus);outline-offset:-3px;filter:none}#keytip{position:fixed;z-index:20;background:var(--text);color:var(--bg);border:2px solid var(--bg);font:600 17px/22px system-ui;padding:8px 12px;border-radius:8px;min-width:120px;max-width:240px;pointer-events:none;text-align:center}#keytip:after{content:"";position:absolute;left:calc(var(--ax) - 8px);top:100%;border:8px solid transparent;border-top-color:var(--text)}#keytip.below:after{top:auto;bottom:100%;border-top-color:transparent;border-bottom-color:var(--text)}#sheet h3{margin:8px 0 4px;font:700 14px/18px system-ui;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}#sheet .seq{display:flex;flex-wrap:wrap;gap:4px}#sheet .mk{min-width:28px;height:32px;padding:0 6px;border-radius:6px;font:700 17px/32px system-ui;text-align:center}#sheet .mk.d{background:var(--dg);color:var(--dgf);border:var(--dgb);line-height:28px}#sheet .mk.u{background:var(--unit);color:#000}#sheet .mk.o{background:var(--op);color:var(--opf)}#sheet .mk.e{background:var(--eq);color:var(--eqf)}#sheet table{border-collapse:collapse;width:100%;margin-top:8px;font:500 16px/22px system-ui}#sheet th{text-align:left;color:var(--muted);font:600 14px system-ui;padding:4px 0}#sheet td{padding:4px 0;border-top:1px solid var(--fn);font-family:ui-monospace,monospace}#sheet tr.ans td{font-weight:700}#sheet dl.gl{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:0}#sheet dl.gl dt{font:700 16px/22px system-ui;white-space:nowrap}#sheet dl.gl dd{margin:0;font:500 16px/22px system-ui}