* { box-sizing: border-box; }

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #a8edea, #fed6e3);
  font-family: Arial, sans-serif;
}

.calculator {
  background: #222;
  padding: 20px;
  border-radius: 20px;
  box-shadow: 0px 8px 20px rgba(0,0,0,0.5);
  width: 350px;
}

.display {
  width: 100%;
  height: 70px;
  background: #111;
  color: #fff;
  font-size: 1.8em;
  text-align: right;
  padding: 15px;
  border-radius: 10px;
  margin-bottom: 20px;
  overflow-x: auto;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}

button {
  height: 55px;
  font-size: 1em;
  font-weight: bold;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: 0.2s;
}

button:hover {
  transform: scale(1.05);
}

.number { background: #2e86de; color: white; }
.operator { background: #ff9f43; color: white; }
.function { background: #10ac84; color: white; }
.equal { background: #e67e22; color: white; grid-column: span 2; }
.clear { background: #ee5253; color: white; }
.delete { background: #576574; color: white; }