.schumacher-calculator-root {
  color-scheme: light;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: #172026;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.schumacher-calculator-root,
.schumacher-calculator-root * {
  box-sizing: border-box;
}

.schumacher-calculator-root button {
  font: inherit;
}

.schumacher-calculator-root .app-shell {
  display: grid;
  place-items: center;
  padding: 24px 0;
}

.schumacher-calculator-root .calculator {
  width: min(100%, 396px);
  border: 1px solid #dce2e8;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 22px 60px rgba(17, 24, 39, 0.12);
  padding: 18px;
}

.schumacher-calculator-root .display {
  min-height: 180px;
  border-radius: 8px;
  background: #172026;
  color: #f7fbfb;
  padding: 22px;
  overflow: hidden;
}

.schumacher-calculator-root .display-label {
  color: #a9bbc4;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.schumacher-calculator-root .result-label {
  margin-top: 18px;
}

.schumacher-calculator-root .expression {
  min-height: 28px;
  margin-top: 8px;
  color: #dce7eb;
  font-size: 1.2rem;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.schumacher-calculator-root .primary-display {
  min-height: 46px;
  margin-top: 8px;
  color: #ffffff;
  font-size: 2.15rem;
  font-weight: 800;
  line-height: 1.18;
  overflow-wrap: anywhere;
}

.schumacher-calculator-root .preview {
  min-height: 24px;
  margin-top: 10px;
  color: #7dd3c7;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
}

.schumacher-calculator-root .preview-error {
  color: #f8b4a0;
}

.schumacher-calculator-root .keypad {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.schumacher-calculator-root .key {
  min-height: 64px;
  border: 1px solid #dfe6ec;
  border-radius: 8px;
  background: #f8fafb;
  color: #172026;
  cursor: pointer;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1;
  transition:
    transform 140ms ease,
    border-color 140ms ease,
    background-color 140ms ease,
    box-shadow 140ms ease;
}

.schumacher-calculator-root .key:hover {
  border-color: #b8c6ce;
  background: #eef3f5;
  box-shadow: 0 10px 24px rgba(17, 24, 39, 0.08);
  transform: translateY(-1px);
}

.schumacher-calculator-root .key:active {
  box-shadow: none;
  transform: translateY(0);
}

.schumacher-calculator-root .key:focus-visible {
  outline: 3px solid #99f6e4;
  outline-offset: 2px;
}

.schumacher-calculator-root .key-control {
  background: #fff7ed;
  border-color: #fed7aa;
  color: #9a3412;
}

.schumacher-calculator-root .key-control:hover {
  border-color: #fdba74;
  background: #ffedd5;
}

.schumacher-calculator-root .key-operator {
  background: #eef9f7;
  border-color: #a7f3d0;
  color: #0f766e;
}

.schumacher-calculator-root .key-operator:hover {
  border-color: #5eead4;
  background: #dff7f3;
}

.schumacher-calculator-root .key-equals {
  grid-row: span 2;
  background: #0f766e;
  border-color: #0f766e;
  color: #ffffff;
}

.schumacher-calculator-root .key-equals:hover {
  background: #0b5e59;
  border-color: #0b5e59;
}

.schumacher-calculator-root .key-wide {
  grid-column: span 2;
}

@media (max-width: 420px) {
  .schumacher-calculator-root .app-shell {
    padding: 14px 0;
  }

  .schumacher-calculator-root .calculator {
    padding: 14px;
  }

  .schumacher-calculator-root .display {
    min-height: 164px;
    padding: 18px;
  }

  .schumacher-calculator-root .primary-display {
    font-size: 1.75rem;
  }

  .schumacher-calculator-root .keypad {
    gap: 10px;
  }

  .schumacher-calculator-root .key {
    min-height: 58px;
    font-size: 1.18rem;
  }
}