body {
    font-family: 'Quicksand', sans-serif;
    background-image:url(../images/bg.jpg);
    background-size:cover;
    background-repeat:no-repeat;
    min-height: 100vh;
}


.card-header {
    position: relative;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

    /* Hiệu ứng tráng gương ánh sáng quét */
    .card-header::before {
        content: '';
        position: absolute;
        opacity: 0.2;
        top: -50%;
        left: -50%;
        width: 200%;
        height: 200%;
        background: linear-gradient( 120deg, transparent 0%, rgba(255, 255, 255, 0.5) 50%, transparent 100% );
        animation: shimmer 3s linear infinite;
        transform: rotate(25deg);
    }

/* Animation loop */
@keyframes shimmer {
    0% {
        transform: translateX(-100%) rotate(-25deg);
    }

    100% {
        transform: translateX(100%) rotate(-25deg);
    }
}

.card {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.card-header {
    background: linear-gradient(135deg, #007bff, #00bfff);
}

.form-control:focus {
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.6);
    border-color: #007bff;
}

#captcha-img {
    cursor: pointer;
    transition: transform 0.3s;
}

    #captcha-img:hover {
        transform: scale(1.05);
    }

.btn-primary {
    transition: 0.3s ease-in-out;
}

    .btn-primary:hover {
        background-color: #0056b3;
    }

.card-footer {
    background-color: #f8f9fa;
}
button.btn.btn-link.btn-sm.mt-2 {
    text-decoration: none
}
#loginBtn {
    background: linear-gradient(270deg, #0066ff, #1fdbca, #0066ff);
    background-size: 400% 400%;
    color: white;
    border: none;
    transition: box-shadow 0.3s ease-in-out;
    animation: gradientShift 6s ease infinite;
    border-radius: 8px;
    font-size: 18px;
}

    #loginBtn:hover {
        box-shadow: 0 0 12px rgba(0, 255, 140, 0.8), 0 0 25px rgba(0, 255, 140, 0.5);
    }
#loginVNEIDbtn {
    font-size: 17px;
}
@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}
.font-weight-bold {
    font-weight: bold
}