body {
  font-family: 'Segoe UI', sans-serif;
  background: #f5f7fa;
  margin: 0;
  padding: 20px;
  color: #333;
}

.container {
  max-width: 500px;
  margin: auto;
  background: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.1);
  text-align: center;
}

h1 {
  margin-bottom: 10px;
  color: #2c3e50;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(2, 80px);
  gap: 15px;
  justify-content: center;
  margin: 20px 0;
}

input[type="number"] {
  padding: 10px;
  font-size: 1.2rem;
  text-align: center;
  border: 1px solid #ccc;
  border-radius: 8px;
  width: 80px;
  height: 60px;
}

button {
  padding: 12px 25px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  background-color: #3498db;
  color: white;
  cursor: pointer;
}

button:hover {
  background-color: #2980b9;
}

.result {
  margin-top: 20px;
  font-size: 1.3rem;
  font-weight: bold;
  color: #2e7d32;
}