:root {
  color-scheme: dark;
  --calc-width: min(100%, 390px);
  --stage-pad-x: 16px;
  --stage-pad-y: 12px;
  --key-gap: 12px;
  --display-size: 78px;
  --digit-size: 34px;
  --utility-size: 26px;
  --phone: #000000;
  --display: #f6f7fb;
  --digit: #33353b;
  --digit-active: #45484f;
  --utility: #a6a7ab;
  --utility-active: #c4c5c8;
  --operator: #f59d22;
  --operator-active: #ffffff;
  --operator-text: #ffffff;
  --operator-active-text: #f59d22;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--phone);
  color: var(--display);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow: hidden;
  overscroll-behavior: none;
  touch-action: manipulation;
}

.notranslate {
  translate: no;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: max(3px, env(safe-area-inset-top));
  background: #000;
  pointer-events: none;
  z-index: 9999;
}

button {
  border: 0;
  color: inherit;
  font: inherit;
}

.stage {
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding:
    max(var(--stage-pad-y), env(safe-area-inset-top))
    max(var(--stage-pad-x), env(safe-area-inset-right))
    max(var(--stage-pad-y), env(safe-area-inset-bottom))
    max(var(--stage-pad-x), env(safe-area-inset-left));
  background: var(--phone);
}

.phone {
  width: var(--calc-width);
  height: 100%;
  min-height: 0;
  position: relative;
  background: var(--phone);
  overflow: hidden;
}

.native-shell .stage {
  padding:
    max(var(--stage-pad-y), env(safe-area-inset-top))
    max(var(--stage-pad-x), env(safe-area-inset-right))
    max(var(--stage-pad-y), env(safe-area-inset-bottom))
    max(var(--stage-pad-x), env(safe-area-inset-left));
}

.native-shell .calculator {
  padding: 0;
}

.calculator {
  height: 100%;
  display: grid;
  grid-template-rows: minmax(104px, 1fr) auto;
  gap: var(--key-gap);
  padding: 0;
  background: var(--phone);
}

.display {
  align-self: end;
  display: block;
  width: 100%;
  min-height: 92px;
  padding: 0 4px var(--key-gap);
  color: var(--display);
  font-size: var(--display-size);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
}

.keys {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--key-gap);
}

.key {
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 999px;
  background: var(--digit);
  color: #fff;
  cursor: pointer;
  font-size: var(--digit-size);
  font-weight: 400;
  line-height: 1;
  user-select: none;
  transition: transform 90ms ease, background-color 120ms ease, color 120ms ease;
}

.key:active,
.key.pressed {
  transform: scale(0.96);
  background: var(--digit-active);
}

.utility {
  background: var(--utility);
  color: #08090c;
  font-size: var(--utility-size);
}

.utility:active,
.utility.pressed {
  background: var(--utility-active);
}

.operator {
  background: var(--operator);
  color: var(--operator-text);
}

.operator.selected {
  background: var(--operator-active);
  color: var(--operator-active-text);
}

.zero {
  grid-column: span 2;
  aspect-ratio: auto;
  border-radius: 999px;
  justify-content: start;
  padding-left: 12%;
}

.payment-gate {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: #000;
  z-index: 10000;
}

.payment-panel {
  width: min(100%, 320px);
  display: grid;
  gap: 16px;
}

.payment-panel h1 {
  margin: 0 0 8px;
  color: #f6f7fb;
  font-size: 34px;
  font-weight: 500;
  letter-spacing: 0;
  text-align: center;
}

.payment-button,
.unlock-button,
.unlock-input {
  height: 54px;
  border: 0;
  border-radius: 999px;
  font: inherit;
}

.payment-button,
.unlock-button {
  background: var(--operator);
  color: #fff;
  cursor: pointer;
  font-size: 20px;
}

.unlock-row {
  display: grid;
  grid-template-columns: 1fr 72px;
  gap: 10px;
}

.unlock-input {
  min-width: 0;
  padding: 0 18px;
  background: var(--digit);
  color: #fff;
  font-size: 20px;
  outline: none;
}

@media (orientation: landscape) and (max-height: 520px) {
  .calculator {
    grid-template-rows: minmax(54px, 1fr) auto;
  }

  .display {
    min-height: 54px;
    padding-bottom: 4px;
  }
}