* {
  box-sizing: border-box;
  font-family: "Segoe UI", Arial, sans-serif;
}

body {
  margin: 0;
  background: #2b2b2b;
  color: white;
}

.container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 60px;
}

.info h1 {
  font-size: 72px;
  margin: 0;
}

.info span {
  color: #ff7a18;
}

.info p {
  font-size: 28px;
  margin-top: 20px;
  line-height: 1.3;
}

.calculator {
  background: #2f2f2f;
  border-radius: 20px;
  padding: 20px;
  width: 320px;
}

#display {
  width: 100%;
  height: 60px;
  font-size: 32px;
  text-align: right;
  border: none;
  border-radius: 10px;
  padding: 10px;
  margin-bottom: 15px;
  background: #2b2b2b;
  color: white;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

button {
  height: 55px;
  font-size: 18px;
  border: none;
  border-radius: 10px;
  background: #3a3a3a;
  color: white;
  cursor: pointer;
}

button:hover {
  opacity: 0.85;
}

.orange {
  background: #b65c24;
}

.gray {
  background: #555;
}

.zero {
  grid-column: span 2;
}