:root{--bg:#1a1917;--side:#232220;--card:#2c2a27;--active:#413d35;--ink:#f1ede4;--muted:#a8a296;--line:#3d3a35;--acc:#e0a458;--accInk:#1a1917;--bad:#f0837a;color-scheme:dark;box-sizing:border-box;padding:env(safe-area-inset-top,0px) env(safe-area-inset-right,0px) env(safe-area-inset-bottom,0px) env(safe-area-inset-left,0px)}
@media(prefers-color-scheme:light){:root{--bg:#f6f4ef;--side:#fffdf9;--card:#ebe6da;--active:#ddd5c4;--ink:#222;--muted:#6a665e;--line:#e4dccb;--acc:#b8721c;--accInk:#fff;--bad:#c0392b;color-scheme:light}}
*,*::before,*::after{box-sizing:inherit}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.4 system-ui,-apple-system,"Segoe UI",sans-serif}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer;touch-action:manipulation}
.top{display:flex;align-items:center;gap:.6rem;padding:.6rem 1rem;border-bottom:1px solid var(--line);background:var(--side);flex-wrap:wrap}
.top h1{font:600 1.15rem Georgia,serif;margin:0;flex:1}
.back{color:var(--muted);text-decoration:none}
.back:hover{color:var(--ink)}
.tb,.ib,.sm{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:.3rem .7rem}
.sm{padding:.1rem .5rem;font-size:.8rem;color:var(--muted)}
.tb:hover,.ib:hover,.sm:hover{background:var(--active)}
.chips{display:flex;gap:.4rem;overflow-x:auto;padding:.6rem 1rem;scrollbar-width:thin}
.chip{flex:none;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:.35rem .9rem}
.chip[aria-pressed=true],.seg button[aria-pressed=true],.pg[aria-pressed=true],.ib[aria-pressed=true]{background:var(--acc);color:var(--accInk);border-color:var(--acc)}
.bar{display:flex;flex-wrap:wrap;gap:.5rem 1rem;align-items:center;padding:0 1rem .7rem}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{border:0;background:var(--card);padding:.3rem .7rem}
.seg button+button{border-left:1px solid var(--line)}
select,input[type=text]{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:.4rem .6rem;min-width:0}
main{max-width:1100px;margin:0 auto;padding:0 1rem 2rem}
.exprwrap{display:grid;gap:.8rem}
@media(min-width:900px){.exprwrap{grid-template-columns:1fr 1.1fr;align-items:start}}
.screen{background:var(--side);border:1px solid var(--line);border-radius:16px;display:flex;flex-direction:column;overflow:hidden}
.hist{overflow-y:auto;max-height:34dvh;min-height:130px;padding:.6rem .9rem;display:flex;flex-direction:column;gap:.5rem}
@media(min-width:900px){.hist{max-height:none;height:min(50dvh,440px)}}
.row{border-bottom:1px dashed var(--line);padding-bottom:.4rem}
.row .e{display:block;width:100%;text-align:left;background:none;border:0;padding:0;overflow-x:auto;color:var(--muted)}
.ar{display:flex;align-items:flex-end;justify-content:flex-end;gap:.5rem}
.row .a{background:none;border:0;padding:0;text-align:right;max-width:100%;overflow-x:auto}
.row.bad .a{color:var(--bad)}
.inrow{display:flex;gap:.4rem;padding:.5rem .6rem;border-top:1px solid var(--line)}
.ex{flex:1;font:1.25rem ui-monospace,Menlo,Consolas,monospace;padding:.5rem .7rem}
.live{min-height:1.6rem;padding:0 .9rem;color:var(--muted);font:1.05rem ui-monospace,Menlo,Consolas,monospace;text-align:right;white-space:pre-line}
.bad{color:var(--bad)}
.tools{display:flex;gap:.4rem;justify-content:space-between;padding:.4rem .6rem .6rem}
.keys{display:grid;gap:.5rem}
.pages{display:flex;gap:.3rem;flex-wrap:wrap}
.pg{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:.25rem .8rem}
.grid{display:grid;gap:.4rem}
.grid.fn{grid-template-columns:repeat(auto-fill,minmax(58px,1fr))}
.grid.num{grid-template-columns:repeat(5,1fr)}
.k{min-height:46px;border:0;border-radius:10px;background:var(--card);padding:.2rem}
.k:hover{background:var(--active)}
.k:active{transform:scale(.97)}
.k.op{background:var(--active)}
.k.eq{background:var(--acc);color:var(--accInk);font-weight:700}
.k.ac{color:var(--bad)}
.vars{color:var(--muted);font:.85rem ui-monospace,Menlo,Consolas,monospace;word-break:break-all}
.panel{background:var(--side);border:1px solid var(--line);border-radius:16px;padding:1rem;display:grid;gap:.9rem}
.hint{margin:0;color:var(--muted);font-size:.9rem}
.f{display:grid;gap:.2rem;font-size:.85rem;color:var(--muted)}
.f input,.f select{font-size:1rem;color:var(--ink)}
.frow{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:.6rem}
.chk{display:flex;align-items:center;gap:.4rem}
.res{display:grid;gap:.4rem}
.kv1{display:flex;justify-content:space-between;gap:1rem;border-bottom:1px dashed var(--line);padding:.2rem 0;font-family:ui-monospace,Menlo,Consolas,monospace;white-space:pre-line}
.kv1 b{text-align:right;font-weight:600}
.scroll{overflow:auto;max-height:60dvh;border:1px solid var(--line);border-radius:10px}
table.dt{border-collapse:collapse;width:100%}
.dt th,.dt td{padding:.25rem .5rem;text-align:right;border-bottom:1px solid var(--line);font-family:ui-monospace,Menlo,Consolas,monospace}
.dt th{position:sticky;top:0;background:var(--side);color:var(--muted)}
.dt td input{width:100%;min-width:76px;text-align:right;border-radius:6px;padding:.25rem .4rem}
.eqrow{display:grid;grid-template-columns:repeat(auto-fit,minmax(90px,1fr));gap:.5rem}
.dlg{background:var(--side);color:var(--ink);border:1px solid var(--line);border-radius:16px;width:min(560px,94vw);max-height:84dvh;padding:1rem}
.dlg::backdrop{background:rgba(0,0,0,.55)}
.dh{display:flex;justify-content:space-between;align-items:center;margin-bottom:.6rem}
.dh h2{margin:0;font:600 1.1rem Georgia,serif}
.clist{display:grid;gap:.3rem}
.clist button{display:flex;justify-content:space-between;gap:1rem;text-align:left;background:var(--card);border:0;border-radius:10px;padding:.5rem .7rem}
.clist button:hover{background:var(--active)}
.clist small{color:var(--muted)}

.ed{position:relative;flex:1;min-width:0;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:.3rem .7rem;cursor:text}
.ed:focus-within{border-color:var(--acc)}
.sink{position:absolute;left:0;top:0;width:1px;height:1px;opacity:0;border:0;padding:0;pointer-events:none}
.m-screen,.m-static,.m-ans{font-family:"Cambria Math","STIX Two Math","Latin Modern Math",Georgia,serif}
.m-screen{font-size:1.6rem;line-height:1.25;white-space:pre;overflow-x:auto;overflow-y:hidden;min-height:2.7rem;display:flex;align-items:center;scrollbar-width:thin}
.m-screen.empty::before{content:attr(data-ph);position:absolute;color:var(--muted);font:1rem system-ui,sans-serif;pointer-events:none}
.m-seq{display:inline-flex;align-items:center;white-space:pre}
.m-static{display:inline-flex;align-items:center;white-space:pre;font-size:1.1rem;color:var(--muted)}
.m-ans{font-size:1.5rem;display:grid;justify-items:end;white-space:pre}
.m-row{display:flex;align-items:center;gap:.1em}
.m-frac{display:inline-flex;flex-direction:column;align-items:center;margin:0 .15em}
.m-num{display:flex;justify-content:center;border-bottom:1.5px solid currentColor;padding:0 .2em .06em}
.m-den{display:flex;justify-content:center;padding:.06em .2em 0}
.m-mixed{display:inline-flex;align-items:center}
.m-sqrt{display:inline-flex;align-items:stretch;margin:0 .1em}
.m-rad{width:.85em;flex:none;min-height:1.1em;overflow:visible}
.m-body{display:flex;align-items:center;border-top:1.5px solid currentColor;padding:.12em .15em 0 .05em;margin-left:-.15em}
.m-idx{font-size:.6em;align-self:flex-start;margin:0 -.55em 0 .1em;z-index:1}
.m-lg{display:inline-flex;align-items:center}
.m-sub{font-size:.65em;align-self:flex-end;margin:0 .08em -.15em}
.m-sup{font-size:.65em;align-self:flex-start;margin-top:-.1em}
.m-box{display:inline-flex;align-items:center;min-width:.55em;min-height:.95em;border:1px dashed var(--muted);border-radius:2px}
.cur{display:inline-block;width:2px;height:1.15em;background:var(--acc);margin:0 -1px;flex:none;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.k .m-static{font-size:1rem;color:inherit;pointer-events:none}
.k .m-box{min-width:.4em;min-height:.6em}