:root {
  /* Tokens from Figma node 20:142 (Cal) */
  --bg-main: #140b0b;
  --btn-number: #1e1e1e;
  --btn-utility: #797979;
  --btn-operator: #ce702b;
  --text-primary: #ffffff;
  --text-secondary: #706d6d;
  --radius: 16px;
  --key-gap: 15px;
  --row-gap: 16px;
  --section-gap: 39px;
  --key-min-height: 71px;
  --font-size-display-primary: clamp(40px, 12vw, 64px);
  --font-size-display-secondary: clamp(22px, 5.5vw, 32px);
  --font-size-btn: clamp(26px, 7vw, 32px);
  --calculator-max-width: 390px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.calculator {
  width: 100%;
  max-width: min(var(--calculator-max-width), 95vw);
  display: flex;
  flex-direction: column;
  gap: var(--section-gap);
  padding: 0;
}

/* Display area */
.display-area {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 24px;
  min-height: 120px;
  padding-top: 24px;
  width: 100%;
}

.display-secondary {
  font-size: var(--font-size-display-secondary);
  font-weight: 600;
  color: var(--text-secondary);
  text-align: right;
  line-height: 1.2;
  min-height: 1.2em;
  word-break: break-all;
}

.display-primary {
  font-size: var(--font-size-display-primary);
  font-weight: 600;
  color: var(--text-primary);
  text-align: right;
  line-height: 1.2;
  min-height: 1.2em;
  word-break: break-all;
}

/* Keypad */
.keypad {
  display: flex;
  flex-direction: column;
  gap: var(--row-gap);
}

.keypad-row {
  display: flex;
  gap: var(--key-gap);
  justify-content: space-between;
}

/* Buttons */
.btn {
  flex: 1 1 0;
  min-width: 0;
  min-height: var(--key-min-height);
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: var(--font-size-btn);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.15s ease, transform 0.05s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.btn:active {
  transform: scale(0.96);
  opacity: 0.9;
}

.btn-number {
  background: var(--btn-number);
}

.btn-utility {
  background: var(--btn-utility);
}

.btn-operator {
  background: var(--btn-operator);
}

.btn-operator.active {
  background: #e8883a;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.28);
}

.btn svg {
  flex-shrink: 0;
}