* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #e3f2fd, #ffffff);
  color: #333;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 600px;
  margin: 40px auto;
  padding: 20px;
  text-align: center;
}

h1 {
  font-size: 2rem;
  margin-bottom: 30px;
  color: #0d47a1;
}

.card {
  background: white;
  padding: 20px 30px;
  margin: 20px auto;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: 0.3s ease-in-out;
}

.card:hover {
  transform: scale(1.01);
}

h2 {
  margin-top: 0;
  color: #1976d2;
}

label {
  display: block;
  margin-bottom: 6px;
  text-align: left;
  font-weight: 600;
}

.select-row {
  margin: 12px 0;
  text-align: left;
}

select,
input {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 8px;
}

button {
  margin-top: 20px;
  padding: 12px;
  width: 100%;
  background: #2196f3;
  color: white;
  border: none;
  font-weight: bold;
  font-size: 1rem;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background: #0d8bf2;
}

.result {
  margin-top: 15px;
  font-size: 1.1rem;
  font-weight: bold;
  color: #2c3e50;
}

footer {
  margin-top: 50px;
  padding: 15px;
  text-align: center;
  font-size: 0.9rem;
  color: #777;
}