:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#1d2733;background:#edf1f4;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-width:320px;min-height:100vh;margin:0}#root{min-height:100vh}*{box-sizing:border-box}button{font:inherit}.app-shell{width:min(100% - 40px,960px);min-height:100vh;display:grid;grid-template-columns:minmax(0,1.18fr) minmax(280px,.82fr);align-items:center;gap:18px;margin:0 auto;padding:32px 0}.calculator-panel,.history-panel{background:#fff;border:1px solid #dce1e9;border-radius:8px;box-shadow:0 16px 40px #27304114}.calculator-panel{padding:26px}.app-header{display:flex;align-items:center;gap:12px;margin-bottom:26px}.brand-mark{width:42px;height:42px;display:grid;place-items:center;flex:0 0 auto;color:#fff;background:#16756b;border-radius:8px}.eyebrow{margin:0 0 2px;color:#687386;font-size:.7rem;font-weight:700;letter-spacing:.12em}h1,h2,p{margin-top:0}h1{margin-bottom:0;color:#1e2532;font-size:1.35rem;line-height:1.2}.display{min-height:132px;display:flex;flex-direction:column;justify-content:flex-end;padding:18px 20px;overflow:hidden;text-align:right;background:#f3f6f8;border:1px solid #d8e1e5;border-radius:7px}.display-caption{min-height:20px;margin:0 0 8px;overflow:hidden;color:#697484;font-size:.78rem;font-weight:600;letter-spacing:.02em;text-overflow:ellipsis;white-space:nowrap}.display-value{display:block;overflow-x:auto;color:#1d2733;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:clamp(1.9rem,5vw,3rem);font-weight:700;letter-spacing:0;line-height:1.15;white-space:nowrap}.error-text,.error-value{color:#bd3f32}.keypad{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:16px}.calculator-key{min-width:0;aspect-ratio:1.15;display:grid;place-items:center;padding:0;color:#222b37;background:#f8fafb;border:1px solid #dce3e8;border-radius:7px;cursor:pointer;font-size:1.1rem;font-weight:650;transition:background-color .14s ease,border-color .14s ease,transform .14s ease}.calculator-key:hover{background:#e9f2f1;border-color:#86b7b1}.calculator-key:active{transform:translateY(1px)}.calculator-key.utility{color:#4e5d6f;background:#edf1f4}.calculator-key.operator{color:#0f6259;background:#e5f2ef;border-color:#b8d9d2}.calculator-key.primary{color:#fff;background:#16756b;border-color:#16756b}.calculator-key.primary:hover{background:#0f6259;border-color:#0f6259}.calculator-key:focus-visible,.icon-button:focus-visible,.history-entry:focus-visible{outline:3px solid #4a9b91;outline-offset:2px}.history-panel{align-self:stretch;min-height:500px;display:flex;flex-direction:column;padding:22px}.history-header{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding-bottom:18px;border-bottom:1px solid #e1e5eb}.history-title-row{display:flex;align-items:center;gap:8px;color:#1d2733}h2{margin-bottom:0;font-size:1rem;line-height:1.2}.sync-status{display:flex;align-items:center;gap:5px;margin:7px 0 0;color:#657184;font-size:.75rem;font-weight:600}.sync-ready{color:#16756b}.sync-error,.sync-unconfigured{color:#9c5c25}.icon-button{width:34px;height:34px;display:grid;place-items:center;padding:0;color:#5a687a;background:transparent;border:1px solid #d9e0e7;border-radius:6px;cursor:pointer;transition:background-color .14s ease,color .14s ease}.icon-button:hover:not(:disabled){color:#b44036;background:#fff2f0}.icon-button:disabled{cursor:not-allowed;opacity:.45}.history-list{min-height:0;flex:1;display:flex;flex-direction:column;gap:8px;padding-top:14px;overflow-y:auto}.history-entry{width:100%;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 14px;align-items:center;padding:12px;text-align:left;color:#1e2936;background:#fbfcfd;border:1px solid #e2e7ec;border-radius:6px;cursor:pointer;transition:border-color .14s ease,background-color .14s ease}.history-entry:hover{background:#f1f7f6;border-color:#afd3cd}.history-expression{overflow:hidden;color:#6a7586;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:.78rem;text-overflow:ellipsis;white-space:nowrap}.history-entry strong{grid-row:span 2;grid-column:2;color:#12665d;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:.95rem}.history-entry time{color:#8b95a4;font-size:.7rem}.history-empty{min-height:180px;display:grid;place-content:center;justify-items:center;gap:10px;padding:24px;color:#8490a0;text-align:center}.history-empty p{max-width:210px;margin:0;font-size:.82rem;line-height:1.45}.history-error{color:#b44036}.spin{animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 740px){.app-shell{width:min(100% - 24px,520px);grid-template-columns:1fr;align-items:start;padding:12px 0 24px}.calculator-panel,.history-panel{padding:20px}.history-panel{min-height:300px}.calculator-key{aspect-ratio:1.25}}@media (max-width: 390px){.calculator-panel,.history-panel{padding:16px}.keypad{gap:8px}}