/* General Styling */
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #f2f2f2;
  margin: 0;
  font-family: Arial, sans-serif;
}

/* Calculator Container */
.calculator {
  background: rgb(5, 1, 10);
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  padding: 40px;
  width: 100%;
  max-width: 440px;
  box-sizing: border-box;
}

/* Display Screen */
#display {
  width: 100%;
  height: 80px;
  font-size: 24px;
  text-align: right;
  padding: 30px;
  margin-bottom: 15px;
  border: 2px solid #007bff;
  border-radius: 8px;
  color: aliceblue;
  background-color: #111;
  box-sizing: border-box;
}

/* Button Grid */
.buttons {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
}

/* Button Styling */
button {
  padding: 18px;
  font-size: 16px;
  border: 2px solid lawngreen;
  border-radius: 8px;
  background: #010b14;
  color: white;
  cursor: pointer;
  transition: background 0.2s;
  word-break: break-word;
}

button:hover {
  background: #0056b3;
}

/* Equal Button */
.equal {
  background: #ffc107;
  color: #000;
  grid-column: span 4;
}

.equal:hover {
  background: #e0a800;
}

/* 🔁 Responsive Design */
@media (max-width: 600px) {
  .calculator {
    padding: 20px;
  }

  #display {
    height: 60px;
    font-size: 20px;
    padding: 15px;
  }

  button {
    padding: 12px;
    font-size: 14px;
  }

  .buttons {
    grid-template-columns: repeat(4, 1fr); /* Stack layout for mobile */
    gap: 8px;
  }

  .equal {
    grid-column: span 4;
  }
}