/* === ESTILO GENERAL === */
body {
  margin: 0;
  padding: 40px 20px;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to bottom right, #0f2c50, #1b3e66);
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Títulos */
h2 {
  color: #f1c40f;
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.4);
  margin-bottom: 30px;
  font-size: 28px;
}

/* === FORMULARIO === */
form {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 30px;
  width: 100%;
  max-width: 500px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
  box-sizing: border-box;
}

/* === ETIQUETAS Y CAMPOS === */
label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

input[type="text"],
input[type="email"],
input[type="password"],
select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 6px;
  border: none;
  margin-bottom: 20px;
  font-size: 15px;
  box-sizing: border-box;
}

/* Botón enviar */
input[type="submit"] {
  width: 100%;
  padding: 12px;
  background-color: #3498db;
  color: white;
  font-weight: bold;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}
input[type="submit"]:hover {
  background-color: #2980b9;
}

/* Botón grande */
.btn-registrarse-grande {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 2rem auto;
  padding: 14px 30px;
  background-color: #f1c40f;
  color: black;
  font-size: 18px;
  font-weight: bold;
  border-radius: 10px;
  text-decoration: none;
  text-align: center;
  transition: 0.3s;
  box-sizing: border-box;
}
.btn-registrarse-grande:hover {
  background-color: #f39c12;
}

/* Botón volver */
.btn-volver {
  display: inline-block;
  margin: 20px auto;
  padding: 12px 24px;
  background-color: #f1c40f;
  color: #000;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
  font-size: 16px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  transition: background-color 0.3s ease;
  box-sizing: border-box;
}
.btn-volver:hover {
  background-color: #f39c12;
}

/* === MEDIA QUERIES PARA RESPONSIVE === */
@media (max-width: 480px) {
  body {
    padding: 20px 10px;
  }
  h2 {
    font-size: 22px;
    margin-bottom: 20px;
  }
  form {
    padding: 20px;
    max-width: 100%;
  }
  input[type="submit"],
  .btn-registrarse-grande,
  .btn-volver {
    width: 100%;
    font-size: 16px;
    padding: 12px 0;
  }
}