/* fondo */
body {
    background: linear-gradient(135deg, #e6e7ea 0%, #bfc3cc 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Inter', sans-serif;
}

/* efecto glassmorphism */
.login-card {
    background: rgba(40, 40, 45, 0.55);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 20px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.25);
    position:relative;
}

.back-link{
    position:absolute;
    top:20px;
    left:20px;
    color:white;
    font-size:1.4rem;
    text-decoration:none;
}

.back-link:hover{
    color:#d1d1d1;
}

/* icono principal */
.icon-box {
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.1);
    color: white;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin: 0 auto;
}

/* inputs */
.form-control {
    border-color: rgba(255, 255, 255, 0.14);
    color: #f2f2f2 !important;
    background: transparent;
}

.form-control::placeholder {
    color: rgba(255, 255, 255, 0.35);
}

.input-group-text {
    border-color: rgba(255, 255, 255, 0.14);
    color: rgba(255, 255, 255, 0.65);
    background: transparent;
}

.form-control:focus {
    background: transparent;
    border-color: rgba(255, 255, 255, 0.35);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.18);
}

/* boton */
.btn-gradient {
    background: linear-gradient(90deg, #5a5a5a, #3f3f3f);
    color: white;
    border: none;
    transition: 0.3s;
    border-radius: 10px;
}

.btn-gradient:hover {
    background: linear-gradient(90deg, #6a6a6a, #4a4a4a);
    transform: translateY(-2px);
}

/* checkbox */
.form-check-input:checked {
    background-color: #3a3a3a;
    border-color: #3a3a3a;
}