:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:oklch(97.5% .008 91);--surface:oklch(100% 0 0);--surface-subtle:oklch(95% .012 91);--ink:oklch(19% .018 72);--muted:oklch(46% .018 72);--line:oklch(86% .012 91);--primary:oklch(79% .16 91.3);--primary-strong:oklch(63% .15 82);--focus:oklch(55% .14 252);--danger:oklch(53% .19 28);--radius:16px;--shadow:0 24px 70px oklch(25% .025 72/.12);font-synthesis:none;font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{background:var(--bg);min-width:320px}body{min-height:100dvh;color:var(--ink);background:linear-gradient(90deg, transparent 0 49.94%, oklch(88% .01 91/.45) 49.94% 50.06%, transparent 50.06%), var(--bg);margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit}.app-shell{width:min(1180px,100% - 40px);min-height:100dvh;margin:0 auto;padding:22px 0 28px}.app-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;height:54px;display:flex}.brand{color:var(--ink);letter-spacing:-.03em;align-items:center;gap:10px;font-size:1rem;font-weight:760;text-decoration:none;display:inline-flex}.brand-mark{background:var(--primary);width:28px;height:28px;color:var(--ink);border-radius:8px;place-items:center;font-size:1.05rem;line-height:1;display:grid}.status{color:var(--muted);align-items:center;gap:8px;font-size:.78rem;font-weight:650;display:inline-flex}.status span{background:var(--primary-strong);border-radius:50%;width:7px;height:7px;box-shadow:0 0 0 4px oklch(79% .16 91.3/.2)}.workspace{grid-template-columns:minmax(190px,.72fr) minmax(330px,1.3fr) minmax(210px,.72fr);align-items:center;gap:clamp(28px,5vw,72px);min-height:calc(100dvh - 132px);padding:34px 0 20px;display:grid}.intro{align-self:start;padding-top:clamp(30px,10vh,112px)}.eyebrow{color:var(--primary-strong);letter-spacing:.14em;text-transform:uppercase;margin:0 0 17px;font-size:.72rem;font-weight:760}.intro h1{letter-spacing:-.07em;max-width:7ch;margin:0;font-size:clamp(2.8rem,5vw,4.8rem);line-height:.94}.intro>p:last-child{max-width:28ch;color:var(--muted);margin:24px 0 0;font-size:.95rem;line-height:1.65}.calculator-card{border-radius:var(--radius);background:var(--surface);width:100%;max-width:470px;box-shadow:var(--shadow);border:1px solid oklch(90% .01 91);justify-self:center;overflow:hidden}.display{text-align:right;border-bottom:1px solid var(--line);min-height:172px;padding:32px 30px 25px}.expression{min-height:24px;color:var(--muted);font-variant-numeric:tabular-nums;text-overflow:ellipsis;white-space:nowrap;font-size:.9rem;overflow:hidden}.result{font-variant-numeric:tabular-nums;letter-spacing:-.065em;text-overflow:ellipsis;white-space:nowrap;max-width:100%;margin-top:17px;font-size:clamp(2.8rem,6vw,4.45rem);font-weight:680;line-height:1;overflow:hidden}.result.is-error{color:var(--danger);letter-spacing:-.04em;font-size:2rem}.keypad{background:var(--line);grid-template-columns:repeat(4,1fr);gap:1px;display:grid}.key{min-height:72px;color:var(--ink);background:var(--surface);cursor:pointer;border:0;border-radius:0;font-size:1.05rem;font-weight:650;transition:background-color .16s,color .16s,transform .1s}.key:hover{background:var(--surface-subtle)}.key:focus-visible{z-index:1;outline:3px solid var(--focus);outline-offset:-4px;position:relative}.key:active,.key.is-pressed{transform:scale(.96)}.key-muted{color:var(--muted);background:oklch(97.5% .006 91)}.key-operator{color:var(--primary-strong);background:oklch(96.5% .025 91);font-size:1.35rem}.key-equals{color:var(--ink);background:var(--primary);font-size:1.35rem}.key-equals:hover{background:oklch(75% .17 91.3)}.key-zero{grid-column:span 2}.shortcuts{align-self:end;margin-bottom:clamp(28px,7vh,75px)}.shortcut-number{color:var(--primary-strong);margin-bottom:14px;font-size:.72rem;font-weight:760;display:block}.shortcuts h2{letter-spacing:-.03em;margin:0;font-size:1.15rem}.shortcuts p{color:var(--muted);margin:10px 0 28px;font-size:.84rem;line-height:1.55}.shortcuts dl{border-top:1px solid var(--line);margin:0}.shortcuts dl div{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;min-height:45px;display:flex}.shortcuts dt{color:var(--muted);font-size:.76rem}.shortcuts dd{margin:0}kbd{border:1px solid var(--line);background:var(--surface);min-width:34px;min-height:25px;color:var(--ink);box-shadow:0 2px 0 var(--line);border-bottom-color:oklch(74% .015 91);border-radius:7px;place-items:center;padding:3px 7px;font-family:inherit;font-size:.68rem;font-weight:700;display:inline-grid}.keyboard-note{color:var(--muted);opacity:0;pointer-events:none;margin:0;font-size:.72rem;transition:opacity .18s,transform .18s;position:fixed;bottom:18px;right:22px;transform:translateY(8px)}.keyboard-note.is-visible{opacity:1;transform:translateY(0)}@media (width<=900px){body{background:var(--bg)}.workspace{grid-template-columns:minmax(0,1fr) minmax(330px,1.25fr);gap:36px}.shortcuts{display:none}}@media (width<=680px){.app-shell{width:min(100% - 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