:root {
  color-scheme: light;
  --background: #f7f8f4;
  --text: #1e2520;
  --muted: #66716a;
  --field: #ffffff;
  --border: #aeb8b0;
  --focus: #276f86;
  --button: #244b5a;
  --button-text: #ffffff;
  --disabled: #b9bfc0;
  --disabled-text: #62696b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--background);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}

.page {
  width: min(100% - 2rem, 74ch);
  margin: 0 auto;
  padding: 3rem 0;
}

h1 {
  margin: 0 0 1.5rem;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0;
}

.calculator {
  display: grid;
  gap: 1rem;
}

.field {
  display: grid;
  gap: 0.35rem;
}

label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

textarea {
  width: 100%;
  min-width: 50ch;
  min-height: 2.7rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--field);
  color: var(--text);
  font: 1rem/1.35 Consolas, "Courier New", monospace;
  letter-spacing: 0;
  overflow-x: auto;
  overflow-y: hidden;
  resize: none;
  white-space: pre;
}

textarea:focus {
  border-color: var(--focus);
  outline: 3px solid rgb(39 111 134 / 18%);
}

textarea[readonly] {
  background: #eef2ef;
}

.button-row {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

button {
  min-width: 8rem;
  min-height: 2.75rem;
  border: 0;
  border-radius: 6px;
  background: var(--button);
  color: var(--button-text);
  cursor: pointer;
  font: 700 1rem/1 Arial, Helvetica, sans-serif;
  letter-spacing: 0;
}

button:hover:not(:disabled),
button:focus-visible:not(:disabled) {
  background: #173846;
}

button:focus-visible {
  outline: 3px solid rgb(39 111 134 / 28%);
  outline-offset: 2px;
}

button:disabled {
  background: var(--disabled);
  color: var(--disabled-text);
  cursor: not-allowed;
}