*{box-sizing:border-box;margin:0;padding:0}body{-webkit-font-smoothing:antialiased;touch-action:manipulation;background:#0f172a;font-family:system-ui,Segoe UI,Roboto,sans-serif}#root{justify-content:center;align-items:flex-start;min-height:100svh;display:flex}.app{flex-direction:column;gap:14px;width:100%;max-width:420px;padding:16px;display:flex}.chip-grid{grid-template-columns:1fr 1fr;gap:10px;display:grid}.chip-btn{cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;height:72px;transition:outline-color .1s,transform .1s;display:flex}.chip-btn:active{transform:scale(.96)}.chip-label{letter-spacing:1.5px;opacity:.8;font-size:13px;font-weight:700}.chip-value{margin-top:2px;font-size:26px;font-weight:700;line-height:1.1}.chip-btn--active .chip-label{opacity:1}.display{color:#475569;letter-spacing:2px;background:#1e293b;border:2px solid #334155;border-radius:10px;justify-content:flex-end;align-items:center;height:60px;padding:0 20px;font-size:36px;font-weight:700;display:flex}.cursor{opacity:1;animation:1s step-end infinite blink}@keyframes blink{50%{opacity:0}}.keypad{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.key{cursor:pointer;color:#e2e8f0;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;background:#1e293b;border:2px solid #0000;border-radius:10px;height:68px;font-size:28px;font-weight:600;transition:background .15s,color .15s,border-color .15s,transform .1s}.key:active{transform:scale(.93)}.key-zero{grid-column:1/2}.key-enter{grid-column:2/4;font-size:32px}.result{letter-spacing:1px;background:#1e293b;border-radius:10px;justify-content:center;align-items:center;height:64px;font-size:38px;font-weight:800;display:flex}.result--pos{color:#4ade80}.result--neg{color:#f87171}.result--empty{color:#334155}.clear-btn{color:#000;letter-spacing:2px;cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;background:#eab308;border:none;border-radius:10px;height:56px;font-size:20px;font-weight:800;transition:filter .15s,transform .1s}.clear-btn:active{filter:brightness(.9);transform:scale(.97)}