/* === RESET GENERAL === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* === ESTILOS BASE === */
body {
  font-family: 'Segoe UI', Roboto, Arial, sans-serif;
  background: linear-gradient(135deg, #e3f2fd, #f8f9fa);
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === CONTENEDOR PRINCIPAL === */
.main-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  animation: fadeIn 0.6s ease-in-out;
}

/* === TÍTULO === */
.main-container h2 {
  font-size: 2rem;
  color: #007bff;
  margin-bottom: 25px;
  letter-spacing: 0.5px;
}

/* === FORMULARIO === */
form {
  background-color: #ffffff;
  padding: 40px 35px;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 460px;
  transition: all 0.3s ease;
}

form:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

/* === INPUTS === */
form input[type="text"],
form input[type="email"],
form input[type="password"],
form input[type="tel"],
form input[type="date"] {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 18px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s, box-shadow 0.3s;
}

form input:focus {
  border-color: #007bff;
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
  outline: none;
}

/* === BOTÓN === */
form button[type="submit"] {
  width: 100%;
  padding: 12px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  font-size: 1.05rem;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: background-color 0.3s ease, transform 0.1s ease;
}

form button[type="submit"]:hover {
  background-color: #0056b3;
}

form button[type="submit"]:active {
  transform: scale(0.98);
}

/* === MENSAJES DE ERROR Y ESTADO === */
.errores {
  background-color: #fdeaea;
  border-left: 4px solid #dc3545;
  padding: 12px 15px;
  border-radius: 8px;
  margin-bottom: 20px;
  width: 100%;
  max-width: 460px;
  animation: shake 0.4s ease;
}

.errores ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.errores li {
  font-size: 0.95rem;
  color: #b02a37;
  line-height: 1.5;
}

/* === MENSAJE DE CORREO DISPONIBLE/NO DISPONIBLE === */
#mensaje-correo {
  font-size: 0.9rem;
  margin-top: -10px;
  margin-bottom: 10px;
  text-align: left;
  height: 18px;
  transition: color 0.3s;
}

/* === CAMPOS CON ERROR === */
input.error {
  border-color: #dc3545;
  background-color: #fff5f5;
}

/* === ANIMACIONES === */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  50% { transform: translateX(4px); }
  75% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}

/* === RESPONSIVE === */
@media (max-width: 500px) {
  form {
    padding: 25px 20px;
  }
  .main-container h2 {
    font-size: 1.6rem;
  }
}