/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1030;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    padding: 0 50px;
}

    .header.shadow {
        box-shadow: 0 12px 30px rgba(0,0,0,.06);
    }

.brand {
    display: flex;
    align-items: center;
    gap: .6rem;
    font-weight: 900;
    letter-spacing: .06em;
    text-transform: uppercase;
    white-space: nowrap;
}

.brand-badge {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 10px;
    display: grid;
    place-items: center;
    font-weight: 900;
    background: #fff;
}
.navbar-brand img{
    max-height: 50px;
}

.nav-item.dropdown:hover > .dropdown-menu {
    display: block;
    top: 100%;
    left: 0;
    margin-top: .125rem;
}

.nav-link {
    font-weight:700;
    text-transform: uppercase;
    font-size: 1.5rem;
    color: #111 !important;
}

    .nav-link:hover {
        opacity: .75;
    }

.icon-btn {
    border: 1px solid #000;
    background: #fff;
    border-radius: 50px;
    padding: .55rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #000;
}

    .icon-btn:hover {
        background: var(--soft);
    }

.lang {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: .45rem .6rem;
    font-weight: 800;
    background: #fff;
    display: inline-flex;
    align-items: center;
    gap: .45rem;
}

/* ===== Dropdown 3 cấp ===== */
.dropdown-menu {
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
    padding: .55rem;
    min-width: 260px;
}

.dropdown-item {
    border-radius: 12px;
    padding: .55rem .7rem;
    font-weight: 750;
}

    .dropdown-item:hover {
        background: var(--soft);
    }

.dropdown-submenu {
    position: relative;
}

    .dropdown-submenu > .dropdown-menu {
        top: 0;
        left: 100%;
        margin-left: .25rem;
    }

.submenu-caret {
    float: right;
    opacity: .65;
    margin-top: .2rem;
}

@media (max-width: 991.98px) {
    .dropdown-submenu > .dropdown-menu {
        position: static;
        margin-left: 0;
        margin-top: .25rem;
        box-shadow: none;
    }

    .dropdown-menu {
        box-shadow: none;
    }
}