.nav-link {
    font-size: 1.1rem;
    font-weight: 500;
}

.btn-dark {
    border-radius: 10px;
    padding: 8px 20px;
    font-size: 1rem;
}


footer p {
    font-size: 0.9rem;
    color: #666;
}
header .container {
    position: static; /* tránh làm relative nếu không cần */
    overflow: visible; /* cho phép dropdown tràn ra ngoài */
}
header ul.nav li.nav-item a.nav-link {
    position: relative;
    text-decoration: none;
}

header ul.nav li.nav-item a.nav-link:not(.dropdown-toggle)::after {
    content: "";
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: currentColor;
    transition: width 0.4s ease;
}

header ul.nav li.nav-item a.nav-link:hover::after {
    width: 100%;
}


.dropdown-menu {
    background-color: #212529; 
    border: none;
}
.dropdown-menu .dropdown-item {
    position: relative;
    color: #fff;
}

.dropdown-menu .dropdown-item:hover {
    background-color: transparent;
    text-decoration: underline;
}

footer .footer-link {
    font-size: 1.1rem;
    font-weight: 500;
    position: relative;
    text-decoration: none;
    color: #212529;
    transition: color 0.2s;
}
footer .footer-link::after {
    content: "";
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: currentColor;
    transition: width 0.4s ease;
}
footer .footer-link:hover {
    color: #000;
}
footer .footer-link:hover::after {
    width: 100%;
}

.nav-link#userDropdown i.fas.fa-user {
    font-size: 1.8rem;
    line-height: 1;
    vertical-align: middle;
}