/* General page styling */
body {
  background-color: #b19ce4;
  font-family: 'Segoe UI', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px;
}

/* Calculator title */
h1 {
  color: #333;
  margin-bottom: 20px;
}

/* Arrange buttons in grid layout */
.buttons {
  display: block;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  max-width: 300px;
}

/* Result display */
#result-el {
  background-color: #222;
  color: #0f0;
  font-size: 2em;
  width: 300px;
  padding: 10px 20px;
  text-align: right;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 2px solid #444;
  min-height: 40px;
}

/* Grouping buttons */
button {
  padding: 15px 20px;
  font-size: 1.2em;
  margin: 5px;
  border: none;
  border-radius: 10px;
  background-color: #e0e0e0;
  cursor: pointer;
  transition: background-color 0.2s ease;
  min-width: 60px;
}

/* Hover and active effects */
button:hover {
  background-color: #d0d0d0;
}

button:active {
  background-color: #bbb;
}

/* Operator buttons */
#plus,
#subtract,
#divide,
#multiply,
#equal {
  background-color: #f2b632;
  color: white;
}

#plus:hover,
#subtract:hover,
#divide:hover,
#multiply:hover,
#equal:hover {
  background-color: #d19a22;
}

/* Special function buttons */
#clear,
#back {
  background-color: #e53935;
  color: white;
}

#clear:hover,
#back:hover {
  background-color: #c62828;
}