:root{color-scheme:light dark;--bg:#f9f8f7;--surface:#fff;--soft:#f0efed;--text:#242423;--muted:#65635f;--line:#deddd9;--accent:#215f9d;--tint:#e5f2fc;--error:#a62b23}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,select,textarea{font:inherit;color:inherit}button,.button{min-height:44px;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:10px 15px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;text-decoration:none}button:hover,.button:hover{background:var(--soft)}button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.primary{background:var(--text);color:var(--surface);border-color:var(--text)}.primary:hover{background:var(--accent);color:#fff}.danger{color:var(--error);margin-top:20px}.quiet{border:0;background:transparent}.shell{max-width:1160px;margin:auto;padding:32px 32px max(24px,env(safe-area-inset-bottom))}header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:30px}.brand{display:flex;align-items:center;gap:14px}.brand img{width:52px;height:52px}.brand strong{font-size:23px;letter-spacing:-.7px}.brand span{display:block;color:var(--muted);font-size:14px}.badge{font-size:14px;color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:6px 10px}nav{display:flex;gap:8px;border-bottom:1px solid var(--line);padding-bottom:16px}nav button{border:0;background:transparent;color:var(--muted)}nav .active{background:var(--text);color:var(--surface)}main{padding:32px 0}.sectionhead{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--muted);font-weight:700;margin:0 0 5px}h1{font-size:32px;line-height:1.3;letter-spacing:-1px;margin:0}h2{font-size:19px;margin:0 0 16px}.workspace{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:24px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:24px;min-width:0}label{display:block;font-size:14px;color:var(--muted);margin-bottom:12px}input,textarea,select{width:100%;display:block;margin-top:6px;border:1px solid var(--line);border-radius:8px;padding:12px;background:var(--surface);min-height:44px}textarea{resize:vertical;font:20px/1.5 Consolas,monospace}code{font:16px/1.6 Consolas,monospace;overflow-wrap:anywhere;white-space:pre-wrap}input[type=search]{margin-bottom:24px}input[type=file][hidden]{display:none}.result{font-size:38px;font-weight:600;letter-spacing:-1px;overflow-wrap:anywhere;line-height:1.3;min-height:72px;padding:14px 0 20px;font-variant-numeric:tabular-nums}.actions,.row,.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.row{justify-content:space-between}.row h2{margin:0}.controls{align-items:stretch;margin-bottom:16px}.controls label{flex:1;min-width:130px}.keypad{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin-top:24px}.keypad button{font:18px Consolas,monospace;min-height:50px;padding:8px}.keypad .function{color:var(--accent);background:var(--tint);border-color:transparent}.muted{font-size:14px;color:var(--muted)}.history{margin-top:20px;max-height:430px;overflow:auto}.history-item{border-top:1px solid var(--line);padding:14px 0}.history-item button{width:100%;text-align:left;display:block;border:0;overflow-wrap:anywhere;padding:6px;background:transparent}.history-item strong{display:block;font-size:21px}.history-item small{color:var(--muted);display:block}.basegrid{margin-top:24px;display:grid;gap:12px}.base{padding:16px;background:var(--bg);border:1px solid var(--line);border-radius:8px;min-width:0}.base span{display:block;font-size:12px;letter-spacing:2px;color:var(--muted)}.base code{display:block;font-size:20px}.formula-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.formula-card{display:flex;flex-direction:column;gap:12px}.formula-card h2{margin:0}.formula-card code{flex:1}.formula-card .actions button{padding:8px 12px}.formula-card .muted{margin:0}footer{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:20px;font-size:12px;letter-spacing:1px;color:var(--muted)}dialog{background:var(--surface);color:var(--text);border:1px solid var(--line);border-radius:12px;width:min(560px,calc(100% - 32px));padding:24px;max-height:85dvh;overflow:auto}dialog::backdrop{background:#0008}dialog .row{margin-bottom:20px}dialog label{margin-top:16px}#f-error,#int-error{color:var(--error);overflow-wrap:anywhere}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);max-width:calc(100% - 32px);padding:12px 20px;border-radius:8px;background:var(--text);color:var(--surface);z-index:20}ol{padding-left:24px}li{margin-bottom:12px}[hidden]{display:none!important}@media(prefers-color-scheme:dark){:root{--bg:#191919;--surface:#222;--soft:#333;--text:#fafafa;--muted:#b9b7b1;--line:#50504c;--accent:#8cbeef;--tint:#24364a;--error:#ffaaa2}.brand img{border-radius:10px}}@media(max-width:760px){.shell{padding:20px 16px max(20px,env(safe-area-inset-bottom))}header{margin-bottom:20px}.badge{display:none}nav{gap:2px;justify-content:space-between}nav button{padding:10px 9px;font-size:14px}main{padding-top:24px}.workspace{grid-template-columns:1fr}.formula-grid{grid-template-columns:1fr}.sectionhead{align-items:flex-start;flex-wrap:wrap}h1{font-size:28px}.panel{padding:18px}.result{font-size:32px}.keypad{gap:6px}.keypad button{font-size:16px;padding:6px}.actions button{font-size:14px}.controls label{min-width:90px}.controls select{padding:10px 5px;font-size:14px}footer{font-size:11px;letter-spacing:0}.brand strong{font-size:21px}}

.copy-buffer{position:fixed;left:-10000px;top:0;width:1px;height:1px}

button:disabled{opacity:.5;cursor:not-allowed}
input,textarea,select{border-color:#898780}input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}@media(prefers-color-scheme:dark){input,textarea,select{border-color:#81817b}.primary:hover{background:#365f88;color:#fff}}