.icon--close {
    width: 28px;
    height: 28px;
}
.icon--burger {
    width: 28px;
    height: 28px;
}
#hamburger-icon svg {
    transition: opacity 0.3s ease;
}
.bar {
    width: 28px;
    height: 3px;
    background-color: white;
    transition: 0.3s ease;
}
.hamburger {
    display: none;
}

/* Mobile menu base style */
.nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 105;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding-top: 4rem;
    overflow-y: auto; /* ✅ Cho phép cuộn */
    -webkit-overflow-scrolling: touch;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
}

/* Khi active: slide in menu */
.nav-menu.active {
    transform: translateX(0);
}

/* Tablet */
@media (min-width: 600px) {
    .nav-menu {
        width: 60%;
    }
}

/* Laptop trở lên */
@media (min-width: 1024px) {
    .hamburger {
        display: none !important;
    }
    .nav-menu {
        position: static;
        width: auto;
        height: auto;
        background-color: transparent;
        z-index: auto;
        padding-top: 0;
        display: flex;
        flex-direction: row;
        overflow: visible;
        transform: none;
        transition: none;
    }
    .nav-menu li {
        display: inline-block;
        margin-right: 20px;
    }
}

/* Desktop lớn */
@media (min-width: 1440px) {
    .hamburger,
    .nav-menu {
        display: none !important;
    }
}

/* Hiện hamburger ở mobile và tablet */
@media (max-width: 1024px) {
    .hamburger {
        display: block;
    }
}

/* Hamburger animation */
.hamburger.active .icon--burger {
    display: none;
}
.hamburger.active .icon--close {
    display: block;
}
.hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.hamburger.active .bar:nth-child(2) {
    opacity: 0;
}
.hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Ngăn body cuộn khi menu mở */
body.no-scroll {
    overflow: hidden;
}

/* Menu item */
.nav-menu li {
    list-style: none;
    width: 100%;
}
.nav-link,
.submenu-toggle {
    color: white;
    font-size: 1.3rem;
    padding: 1rem 1.5rem;
    text-decoration: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background 0.3s;
}
.nav-link:hover,
.submenu-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Submenu */
.sub-menu {
    max-height: 0;
    overflow: hidden;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.07);
    transition: max-height 0.4s ease;
}
.sub-menu li {
    padding-left: 2rem;
}
.has-submenu.open .sub-menu {
    max-height: 350px;
}
.submenu-arrow {
    font-size: 1.1rem;
    margin-left: auto;
    transition: transform 0.3s ease;
    display: inline-block;
}
.has-submenu.open .submenu-arrow {
    transform: rotate(90deg);
}