:root{
  color-scheme:light dark;
  --bg:#eef1f4;--panel:#f8fafb;--key:#fff;--key2:#e4e8ec;--text:#15191d;--muted:#6b747d;
  --line:#cfd5db;--accent:#ccff00;--accentText:#111;--op:#222930;--opText:#fff;
  --shadow:0 24px 70px rgba(20,25,30,.18);--inset:inset 0 1px 0 rgba(255,255,255,.6)
}
@media(prefers-color-scheme:dark){
  html[data-theme="auto"]{--bg:#090b0d;--panel:#11151a;--key:#1b2127;--key2:#252c33;--text:#f4f7f8;--muted:#89949e;--line:#2b333b;--op:#303942;--opText:#fff;--shadow:0 30px 90px rgba(0,0,0,.55);--inset:inset 0 1px 0 rgba(255,255,255,.05)}
}
html[data-theme="dark"]{--bg:#090b0d;--panel:#11151a;--key:#1b2127;--key2:#252c33;--text:#f4f7f8;--muted:#89949e;--line:#2b333b;--op:#303942;--opText:#fff;--shadow:0 30px 90px rgba(0,0,0,.55);--inset:inset 0 1px 0 rgba(255,255,255,.05)}
html[data-theme="light"]{--bg:#eef1f4;--panel:#f8fafb;--key:#fff;--key2:#e4e8ec;--text:#15191d;--muted:#6b747d;--line:#cfd5db;--op:#222930;--opText:#fff}
*{box-sizing:border-box} body{margin:0;min-height:100vh;display:grid;place-items:center;background:radial-gradient(circle at 50% 0%,color-mix(in srgb,var(--accent) 7%,var(--bg)),var(--bg) 35%);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text)}
button{font:inherit;color:inherit}.shell{width:min(94vw,480px);padding:22px}.brandbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.brand{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--text);letter-spacing:.08em}.brand .mark{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--line);border-radius:10px;font-weight:900;background:var(--panel)}.brand strong,.brand small{display:block}.brand strong{font-size:13px}.brand small{font-size:9px;color:var(--muted);letter-spacing:.22em}.toolbar{display:flex;gap:8px}.iconbtn{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--panel);cursor:pointer}.calculator{background:var(--panel);border:1px solid var(--line);border-radius:26px;padding:16px;box-shadow:var(--shadow),var(--inset)}.display{min-height:145px;padding:24px 10px 18px;display:flex;flex-direction:column;align-items:flex-end;justify-content:flex-end;overflow:hidden}.history{width:100%;text-align:right;min-height:22px;color:var(--muted);font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.value{width:100%;padding-right:8px;text-align:right;font-variant-numeric:tabular-nums;font-size:clamp(42px,12vw,66px);font-weight:650;line-height:1.05;letter-spacing:-.055em;white-space:nowrap;overflow:hidden}.memory-strip{display:grid;grid-template-columns:repeat(4,1fr) 26px;gap:6px;align-items:center;margin:0 2px 10px}.memory-strip button{border:0;background:transparent;color:var(--muted);height:30px;border-radius:8px;cursor:pointer;font-size:12px;font-weight:700}.memory-strip button:hover{background:var(--key2);color:var(--text)}.memory-lamp{font-size:11px;font-weight:900;color:var(--muted);opacity:.25;text-align:center}.memory-lamp.on{color:var(--accent);opacity:1}.keys{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}.keys button,.quick button{border:1px solid var(--line);background:var(--key);border-radius:16px;min-height:68px;cursor:pointer;font-size:23px;font-weight:650;box-shadow:var(--inset);transition:transform .06s ease,filter .1s ease}.keys button:active,.quick button:active,.pressed{transform:scale(.96);filter:brightness(.9)}.keys .utility{background:var(--key2);font-size:18px}.keys .operator{background:var(--op);color:var(--opText)}.keys .equals{background:var(--accent);color:var(--accentText);border-color:color-mix(in srgb,var(--accent) 65%,#000);font-weight:900}.keys .wide{grid-column:span 2;text-align:left;padding-left:29px}.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-top:10px}.quick button{min-height:42px;border-radius:12px;font-size:13px;color:var(--muted)}footer{display:flex;justify-content:space-between;gap:12px;padding:13px 5px 0;color:var(--muted);font-size:11px;letter-spacing:.04em}.kbd{text-align:right}@media(max-width:390px){.shell{padding:10px}.calculator{padding:12px;border-radius:22px}.keys button{min-height:60px}.display{min-height:126px}.brandbar{padding:0 3px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}