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

/* Fondo principal con degradado personalizado */
body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Poppins', sans-serif;
  /* Degradado vertical: gris oscuro arriba, claro en el centro, blanco abajo */
  background: linear-gradient(to bottom, #999999 0%, #e6e6e6 50%, #ffffff 100%);
}

/* Contenedor centralizado */
.login-wrapper {
  text-align: center;
  width: 90%;
  max-width: 360px;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* Logo */
.logo img {
  width: 100px;
  margin: 0 auto 2rem;
  display: block;
}

/* Círculo del icono de usuario */
.icon-circle {
  width: 80px;
  height: 80px;
  background: #222;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.icon-circle i {
  color: #fff;
  font-size: 2.5rem;
}

/* Estilos de formulario */
.fields {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.fields label {
  width: 100%;
  text-align: left;
  margin-bottom: 0.3rem;
  font-weight: 500;
  color: #333;
}
.fields input {
  width: 100%;
  padding: 0.8rem 1rem;
  margin-bottom: 1.2rem;
  border: none;
  border-radius: 36px;
  background: #ccc;
  font-size: 1rem;
  color: #222;
  transition: background 0.2s;
}
.fields input:focus {
  outline: none;
  background: #bbb;
}

/* Botón circular con flecha */
.arrow-btn {
  width: 60px;
  height: 60px;
  background: #222;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s, background 0.2s;
}
.arrow-btn i {
  color: #fff;
  font-size: 1.5rem;
}
.arrow-btn:hover {
  transform: scale(1.1);
  background: #000;
}

/* Responsividad */
@media (max-width: 480px) {
  .login-wrapper {
    padding: 1.5rem;
  }
  .icon-circle {
    width: 64px;
    height: 64px;
  }
  .icon-circle i {
    font-size: 2rem;
  }
  .arrow-btn {
    width: 52px;
    height: 52px;
  }
}
```