@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300&family=Ubuntu:wght@300&display=swap');

html, body {
  height: 100%;
  width: 100%;
  font-family: 'Roboto', sans-serif; 
  background: linear-gradient(135deg, #f5f7fa, #c3cfe2); /* Soft gradient background */
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

h1 {
  color: #333;
  margin-bottom: 20px;
}

.container {
  background: #fff; /* White background for the calculator */
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2); /* Subtle shadow for depth */
  padding: 20px;
  width: 320px;
}

.input {
  width: 100%;
  font-size: 24px;
  padding: 10px;
  border: 2px solid #ddd;
  border-radius: 6px;
  margin-bottom: 10px;
  text-align: right;
  color: #333;
  background-color: #f9f9f9;
}

.button {
  width: 66px;
  padding: 15px;
  margin: 5px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 18px;
  font-weight: bold;
  color: #fff;
  background-color: #4CAF50; /* Default button color */
  transition: all 0.3s ease; /* Smooth hover effect */
}

.button:hover {
  background-color: #45a049; /* Slightly darker green on hover */
}

.button:active {
  transform: scale(0.95); /* Button "press" effect */
}

.row {
  display: flex;
  justify-content: center;
  margin: 10px 0;
}

.button.bg-red {
  background-color: #f44336; /* Red for clear button */
}

.button.bg-red:hover {
  background-color: #d32f2f;
}

.button.operator {
  background-color: #2196F3; /* Blue for operator buttons */
}

.button.operator:hover {
  background-color: #1976d2;
}