header {
      background: linear-gradient(to right, #1f2c65, #4a7bd8);
      color: white;
      text-align: center;
      padding: 3rem 1.5rem;
    }

    header h1 {
      font-size: 2.5rem;
      margin-bottom: 0.5rem;
    }

    header p {
      font-size: 1.2rem;
    }

* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #e6f0ff, #ffffff);
  color: #333;
  line-height: 1.6;
  padding: 20px;
}

.contenedor {
  max-width: 600px;
  margin: auto;
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.bienvenida {
  text-align: center;
  margin-bottom: 30px;
}

.bienvenida h1 {
  font-size: 28px;
  color: #1f4e79;
  margin-bottom: 10px;
}

.bienvenida p {
  font-size: 16px;
  color: #444;
  margin-bottom: 10px;
}

form h2 {
  font-size: 22px;
  color: #1f4e79;
  margin-bottom: 20px;
  text-align: center;
}

form label {
  display: block;
  margin-top: 15px;
  font-weight: bold;
  color: #1f4e79;
}

form input[type="text"],
form input[type="email"],
form input[type="file"],
form select {
  width: 100%;
  padding: 10px;
  margin-top: 6px;
  border: 1px solid #ccc;
  border-radius: 6px;
  background-color: #f9f9f9;
  transition: border-color 0.3s;
}

form input:focus,
form select:focus {
  border-color: #4a90e2;
  outline: none;
}

button[type="submit"] {
  width: 100%;
  padding: 12px;
  background-color: #1f4e79;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  margin-top: 20px;
  cursor: pointer;
  transition: background 0.3s;
}

button[type="submit"]:hover {
  background-color: #4a90e2;
}

/* Responsivo */
@media (max-width: 600px) {
  .contenedor {
    padding: 20px;
  }

  .bienvenida h1 {
    font-size: 24px;
  }

  form h2 {
    font-size: 20px;
  }

  button[type="submit"] {
    font-size: 15px;
  }
}