:root{color:#fff;background:#111;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button{font:inherit}.app-shell{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:18px;background:linear-gradient(180deg,#202124,#101112)}.calculator{display:flex;width:min(100%,390px);min-height:min(720px,calc(100vh - 36px));flex-direction:column;justify-content:flex-end;padding:clamp(18px,5vw,28px);border-radius:34px;background:#000;box-shadow:0 30px 90px #0000008c}.display{display:flex;min-height:190px;flex-direction:column;align-items:flex-end;justify-content:flex-end;gap:8px;overflow:hidden;padding-bottom:18px}.expression{max-width:100%;min-height:26px;overflow:hidden;color:#8f8f8f;font-size:clamp(17px,4.3vw,20px);line-height:1.35;text-overflow:ellipsis;white-space:nowrap}.result{max-width:100%;overflow:hidden;color:#fff;font-size:clamp(48px,15vw,68px);font-weight:300;line-height:1.05;text-align:right;text-overflow:ellipsis;white-space:nowrap}.result.error{color:#ff9f0a;font-size:clamp(40px,12vw,58px)}.button-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(10px,3vw,14px)}.calculator-button{position:relative;overflow:hidden;width:100%;min-width:0;height:clamp(62px,16vw,76px);border:0;border-radius:999px;outline:none;color:#fff;font-size:clamp(24px,7vw,31px);font-weight:400;line-height:1;box-shadow:none;appearance:none;-webkit-tap-highlight-color:transparent}.calculator-button[data-focus-visible=true]{box-shadow:0 0 0 3px #ffffffb8}.calculator-button[data-pressed=true]{filter:brightness(1.12)}.button-number{background:#333}.button-operator,.button-equals{background:#ff9f0a}.button-utility{color:#000;background:#a5a5a5}.button-wide{grid-column:span 2;justify-content:flex-start;padding-left:clamp(24px,7vw,32px)}@media(max-width:420px){.app-shell{align-items:stretch;padding:0;background:#000}.calculator{width:100%;min-height:100vh;border-radius:0;box-shadow:none}}