* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f9fafb;
  color: #1f2937;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.container {
  background-color: #ffffff;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

h1 {
  margin-bottom: 20px;
  color: #111827;
  font-size: 24px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 20px;
}

label {
  text-align: left;
  font-weight: bold;
}

input {
  padding: 10px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

input:focus {
  outline: none;
  border-color: #2563eb;
}

button {
  background-color: #2563eb;
  color: white;
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #1e40af;
}

.resultado {
  font-size: 18px;
  font-weight: bold;
}