.bd-placeholder-img {
    font-size: 1.125rem;
    text-anchor: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
}

@@media (min-width: 768px) {
    .bd-placeholder-img-lg {
        font-size: 3.5rem;
    }
}

.b-example-divider {
    width: 100%;
    height: 3rem;
    background-color: #0000001a;
    border: solid rgba(0, 0, 0, 0.15);
    border-width: 1px 0;
    box-shadow: inset 0 0.5em 1.5em #0000001a, inset 0 0.125em 0.5em #00000026;
}

.b-example-vr {
    flex-shrink: 0;
    width: 1.5rem;
    height: 100vh;
}

.bi {
    vertical-align: -0.125em;
    fill: currentColor;
}

.nav-scroller {
    position: relative;
    z-index: 2;
    height: 2.75rem;
    overflow-y: hidden;
}

    .nav-scroller .nav {
        display: flex;
        flex-wrap: nowrap;
        padding-bottom: 1rem;
        margin-top: -1px;
        overflow-x: auto;
        text-align: center;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
    }

.btn-bd-primary {
    --bd-violet-bg: #712cf9;
    --bd-violet-rgb: 112.520718, 44.062154, 249.437846;
    --bs-btn-font-weight: 600;
    --bs-btn-color: var(--bs-white);
    --bs-btn-bg: var(--bd-violet-bg);
    --bs-btn-border-color: var(--bd-violet-bg);
    --bs-btn-hover-color: var(--bs-white);
    --bs-btn-hover-bg: #6528e0;
    --bs-btn-hover-border-color: #6528e0;
    --bs-btn-focus-shadow-rgb: var(--bd-violet-rgb);
    --bs-btn-active-color: var(--bs-btn-hover-color);
    --bs-btn-active-bg: #5a23c8;
    --bs-btn-active-border-color: #5a23c8;
}

.bd-mode-toggle {
    z-index: 1500;
}

    .bd-mode-toggle .bi {
        width: 1em;
        height: 1em;
    }

    .bd-mode-toggle .dropdown-menu .active .bi {
        display: block !important;
    }

/*=======================================================================================*/
.glow-border {
    position: relative;
    padding: 20px;
    border-radius: 10px;
    overflow: hidden;
}

    .glow-border::before {
        content: "";
        position: absolute;
        inset: 0;
        border: 3px solid transparent;
        border-radius: inherit;
        background: linear-gradient( 90deg, rgba(255, 0, 0, 0.3), /* đỏ mờ */
        rgba(255, 255, 0, 0.3), /* vàng mờ */
        rgba(0, 128, 0, 0.3), /* xanh lá mờ */
        rgba(0, 255, 255, 0.3), /* cyan mờ */
        rgba(0, 0, 255, 0.3), /* xanh dương mờ */
        rgba(128, 0, 128, 0.3), /* tím mờ */
        rgba(255, 0, 0, 0.3) /* đỏ mờ */
        );
        background-size: 400%;
        mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
        mask-composite: exclude;
        -webkit-mask-composite: xor;
        animation: borderFlow 10s linear infinite;
    }

@keyframes borderFlow {
    to {
        background-position: 400% 0;
    }
}