body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: white;

  background: radial-gradient(
    circle at center,
    #1a0033 0%,
    #0a0015 40%,
    #000000 100%
  );

  display: flex;
  justify-content: center;
  align-items: center;

  min-height: 100vh;
  padding: 20px;
}

/* TARJETA */

.card {
  position: relative;
  background: #151515;

  padding: 40px 30px;

  border-radius: 20px;

  width: 100%;
  max-width: 380px;

  text-align: center;

  box-shadow:
    0 0 20px rgba(123, 44, 255, 0.4),
    0 0 40px rgba(123, 44, 255, 0.2);
}

/* LOGO */

.logo {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.circle {
  width: 70px;
  height: 70px;

  border-radius: 50%;

  background: linear-gradient(135deg, #7b2cff, #a855f7);

  display: flex;
  justify-content: center;
  align-items: center;

  font-size: 30px;
}

/* TITULOS */

h1 {
  margin: 10px 0;
}

.subtitle {
  color: #aaa;
  font-size: 14px;
  margin-bottom: 25px;
}

/* FORM */

form {
  text-align: left;
}

label {
  font-size: 14px;
  color: #ccc;
}

/* INPUTS */

.input {
  width: 100%;

  margin-top: 8px;
  margin-bottom: 20px;

  padding: 12px;

  background: #1f1f1f;

  border: 1px solid #333;

  border-radius: 10px;

  color: white;
}

/* TELEFONO */

.telefono {
  display: flex;
  gap: 10px;
  margin-top: 8px;
  margin-bottom: 25px;
}

.codigo {
  width: 80px;

  padding: 12px;

  background: #1f1f1f;

  border: 1px solid #333;

  border-radius: 10px;

  color: white;
}

.numero {
  flex: 1;

  padding: 12px;

  background: #1f1f1f;

  border: 1px solid #333;

  border-radius: 10px;

  color: white;
}

/* BOTON */

button {
  width: 100%;

  padding: 14px;

  border: none;

  border-radius: 10px;

  background: linear-gradient(90deg, #7b2cff, #a855f7);

  color: white;

  font-size: 16px;

  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

/* Estilos para el botón de retroceder */
        .back-button {
            position: absolute;
            top: 20px;
            left: 20px;
        }
        
        .back-arrow {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(123, 47, 247, 0.1);
            border: 1px solid #7b2ff7;
            color: #7b2ff7;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        
        .back-arrow:hover {
            background: #7b2ff7;
            color: white;
            transform: translateX(-3px);
        }
        
        .back-arrow .material-icons {
            font-size: 20px;
        }
        
        /* Ajuste para móvil */
        @media (max-width: 480px) {
            .back-button {
                top: 15px;
                left: 15px;
            }
            
            .back-arrow {
                width: 35px;
                height: 35px;
            }
            
            .back-arrow .material-icons {
                font-size: 18px;
            }
        }

/* ========================== */
/* 📱 TABLETS */
/* ========================== */

@media (max-width: 768px) {

  .card {
    max-width: 420px;
    padding: 35px 25px;
  }

  h1 {
    font-size: 26px;
  }

}

/* ========================== */
/* 📱 CELULARES */
/* ========================== */

@media (max-width: 480px) {

  body{
    padding:15px;
  }

  .card {
    padding: 30px 20px;
  }

  .circle{
    width:60px;
    height:60px;
    font-size:26px;
  }

  h1 {
    font-size: 24px;
  }

  .subtitle{
    font-size:13px;
  }

  .telefono{
    gap:8px;
  }

  .codigo{
    width:65px;
  }

  .input,
  .numero,
  .codigo{
    padding:10px;
    font-size:14px;
  }

  button{
    padding:13px;
    font-size:15px;
  }

}

/* ========================== */
/* 📱 CELULARES PEQUEÑOS */
/* ========================== */

@media (max-width: 360px) {

  .circle{
    width:55px;
    height:55px;
    font-size:24px;
  }

  h1{
    font-size:22px;
  }

  .codigo{
    width:60px;
  }

}