* {
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  margin: 0;
  padding: 0;
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

h1 {
  text-align: center;
  color: #333;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  display: flex;
  flex-direction: column;
  gap: 15px;
}

label {
  font-weight: 600;
  color: #555;
}

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

button {
  padding: 12px;
  background-color: #0077cc;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #005fa3;
}

#resultado {
  margin-top: 10px;
  font-size: 1.2rem;
  font-weight: bold;
  color: #007700;
  text-align: center;
}