/* One shared glass surface for the header and all submenu columns. */
.header-menu-backdrop { display: none; }
#gnb.has-mega-menu {
    --header-glass-bg: rgba(18, 20, 24, .82);
    --header-menu-glass-bg: rgba(18, 20, 24, .6);
    --header-glass-border: rgba(255, 255, 255, .12);
    --header-glass-text: #f3f4f6;
    --header-glass-subtext: #e0e2e6;
    --header-glass-logo: brightness(0) invert(1);
}
body.light-mode #gnb.has-mega-menu {
    --header-glass-bg: rgba(255, 255, 255, .9);
    --header-menu-glass-bg: rgba(255, 255, 255, .84);
    --header-glass-border: rgba(255, 255, 255, .5);
    --header-glass-text: #171717;
    --header-glass-subtext: #444;
    --header-glass-logo: brightness(0);
}

#gnb.has-mega-menu .nav-menu-label {
    position: relative;
    display: inline-block;
    color: inherit !important;
    -webkit-text-fill-color: currentColor !important;
}
#gnb.has-mega-menu .nav-menu-label::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -5px;
    height: 2px;
    background: #ff6e2e;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform .3s ease;
    pointer-events: none;
}
#gnb.has-mega-menu .nav-item:is(:hover, :focus-visible) .nav-menu-label::after {
    transform: scaleX(1);
}
/* Current-page links stay accented with the panel closed or on mobile. */
#gnb.has-mega-menu #navMenu :is(.nav-item, .dropdown-item).active {
    color: #ff6e2e !important;
    -webkit-text-fill-color: currentColor !important;
}

/* Let the shared panel blur the page directly, without an ancestor blur layer. */
html body #gnb.has-mega-menu:is(.is-mega-open, :has(#navMenu.active)) {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

@media (min-width: 1401px) {
    #gnb.has-mega-menu {
        --header-menu-font-size: clamp(16px, 1.4vw, 20px);
        --header-submenu-font-size: clamp(14px, 1.19vw, 17px);
        --mega-top-gap: 4px;
        /* Two submenu rows: line boxes, row padding and one 4px gap. */
        --mega-bottom-gap: 32px;
        --mega-panel-height: calc(var(--header-submenu-font-size) * 3 + 44px + var(--mega-top-gap) + var(--mega-bottom-gap));
    }

    #gnb.has-mega-menu .header-menu-backdrop {
        display: block;
        position: absolute;
        inset: 0 0 auto;
        height: 100%;
        background: var(--header-glass-bg);
        backdrop-filter: blur(40px) saturate(155%);
        -webkit-backdrop-filter: blur(40px) saturate(155%);
        border-bottom: 1px solid var(--header-glass-border);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        z-index: 0;
        transition: height .48s cubic-bezier(.22, 1, .36, 1), opacity .35s ease, visibility .48s, background-color .4s ease, backdrop-filter .4s ease, -webkit-backdrop-filter .4s ease;
    }
    #gnb.has-mega-menu.is-mega-open .header-menu-backdrop {
        opacity: 1;
        visibility: visible;
    }
    #gnb.has-mega-menu.is-mega-open .header-menu-backdrop {
        height: calc(100% + var(--mega-panel-height));
        background: var(--header-menu-glass-bg);
        backdrop-filter: blur(56px) saturate(155%);
        -webkit-backdrop-filter: blur(56px) saturate(155%);
        pointer-events: auto;
        box-shadow: 0 14px 22px rgba(0, 0, 0, .08);
    }

    #gnb.has-mega-menu #navMenu {
        display: grid;
        grid-template-columns: repeat(6, max-content);
        /* Equal gaps between the actual labels, including external-link arrows. */
        width: max-content;
        max-width: 100%;
        justify-self: center;
        font-size: clamp(14px, 1.25vw, 18px);
        gap: clamp(44px, 4.2vw, 80px);
        align-items: center;
    }
    #gnb.has-mega-menu #navMenu .nav-item {
        font-size: var(--header-menu-font-size);
        line-height: 1.2;
    }
    #gnb.has-mega-menu #navMenu > .nav-item,
    #gnb.has-mega-menu #navMenu > .nav-item-group {
        justify-content: center;
        text-align: center;
    }

    #gnb.has-mega-menu #navMenu .dropdown-content {
        display: flex !important;
        flex-direction: column;
        position: absolute !important;
        top: 100%;
        left: 50%;
        width: max-content;
        min-width: 100%;
        height: var(--mega-panel-height);
        padding: var(--mega-top-gap) 0 var(--mega-bottom-gap);
        margin: 0;
        gap: 4px;
        background: transparent !important;
        border: 0 !important;
        border-radius: 0 !important;
        box-shadow: none !important;
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translate(-50%, -8px);
        transition: opacity .35s ease, transform .48s cubic-bezier(.22, 1, .36, 1), visibility .48s;
    }
    #gnb.has-mega-menu.is-mega-open #navMenu .dropdown-content {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translate(-50%, 0);
    }
    #gnb.has-mega-menu #navMenu .dropdown-content .dropdown-item {
        display: block;
        padding: 10px 0;
        margin: 0;
        font-size: var(--header-submenu-font-size);
        line-height: 1.5;
        white-space: nowrap;
        text-align: center;
        color: var(--header-glass-subtext) !important;
        -webkit-text-fill-color: currentColor !important;
        background: transparent !important;
    }
    #gnb.has-mega-menu #navMenu .dropdown-content .dropdown-item:is(:hover, :focus-visible, .active) {
        color: #ff6e2e !important;
        -webkit-text-fill-color: currentColor !important;
    }

    #gnb.has-mega-menu.is-mega-open #navMenu .nav-item,
    html body #gnb.has-mega-menu.is-mega-open .nav-account {
        color: var(--header-glass-text) !important;
        -webkit-text-fill-color: currentColor !important;
    }
    #gnb.has-mega-menu.is-mega-open #navMenu .nav-item:is(:hover, :focus-visible, .active),
    html body #gnb.has-mega-menu.is-mega-open .nav-account:is(:hover, :focus-visible, .is-active) {
        color: #ff6e2e !important;
        -webkit-text-fill-color: currentColor !important;
    }
    html body #gnb.has-mega-menu.is-mega-open .logo img {
        filter: var(--header-glass-logo) !important;
    }
}

@media (max-width: 1400px) {
    html body #gnb.has-mega-menu #navMenu.active {
        background: var(--header-glass-bg) !important;
        backdrop-filter: blur(40px) saturate(155%);
        -webkit-backdrop-filter: blur(40px) saturate(155%);
    }
    #gnb.has-mega-menu #navMenu.active .nav-item { font-size: 30px; }
    #gnb.has-mega-menu #navMenu.active .dropdown-item { font-size: 25px !important; }
    body.light-mode #gnb.has-mega-menu #navMenu.active .nav-item {
        color: #171717 !important;
        -webkit-text-fill-color: currentColor !important;
    }
    body.light-mode #gnb.has-mega-menu #navMenu.active .nav-item:is(:hover, :focus-visible, .active) {
        color: #ff6e2e !important;
        -webkit-text-fill-color: currentColor !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    #gnb.has-mega-menu .header-menu-backdrop,
    #gnb.has-mega-menu #navMenu .dropdown-content { transition: none; }
}

/* One glass surface: transparent at the top, shown on scroll or menu expansion. */
html body #gnb.has-mega-menu {
    background: transparent !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    border-bottom-color: transparent !important;
}
html body #gnb.has-mega-menu:is(.is-scrolled, .is-mega-open) .header-menu-backdrop {
    opacity: 1;
    visibility: visible;
}
html body #gnb.has-mega-menu:is(.is-scrolled, .is-mega-open) #navMenu .nav-item,
html body #gnb.has-mega-menu:is(.is-scrolled, .is-mega-open) .nav-account {
    color: var(--header-glass-text) !important;
    -webkit-text-fill-color: currentColor !important;
}
html body #gnb.has-mega-menu:is(.is-scrolled, .is-mega-open) #navMenu .nav-item:is(:hover, :focus-visible, .active),
html body #gnb.has-mega-menu:is(.is-scrolled, .is-mega-open) .nav-account:is(:hover, :focus-visible, .is-active) {
    color: #ff6e2e !important;
    -webkit-text-fill-color: currentColor !important;
}
html body #gnb.has-mega-menu:is(.is-scrolled, .is-mega-open) .logo img {
    filter: var(--header-glass-logo) !important;
}
@media (max-width: 1400px) {
    #gnb.has-mega-menu .header-menu-backdrop {
        display: block;
        position: absolute;
        inset: 0;
        background: var(--header-glass-bg);
        backdrop-filter: blur(40px) saturate(155%);
        -webkit-backdrop-filter: blur(40px) saturate(155%);
        border-bottom: 1px solid var(--header-glass-border);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        z-index: -1;
        transition: opacity .35s ease, visibility .35s;
    }
    html body #gnb.has-mega-menu.is-scrolled .mobile-menu-toggle span {
        background: var(--header-glass-text) !important;
    }
}

/* Include the gaps between child links in the parent hover area. */
html body #gnb.has-mega-menu #navMenu.nav-center .nav-item-group:is(:hover, :focus-within) > .nav-item {
    color: #ff6e2e !important;
    -webkit-text-fill-color: currentColor !important;
}
html body #gnb.has-mega-menu #navMenu .nav-item-group:is(:hover, :focus-within) > .nav-item .nav-menu-label::after {
    transform: scaleX(1);
}
html body #gnb.has-mega-menu #navMenu .nav-external-label {
    display: inline-flex;
    align-items: center;
    gap: .3em;
}
html body #gnb.has-mega-menu #navMenu .nav-external-arrow {
    flex: 0 0 .85em;
    width: .85em;
    height: .85em;
    color: inherit;
    pointer-events: none;
}
/* Match the optical center and regular weight of the Korean submenu label. */
html body #gnb.has-mega-menu #navMenu .nav-kimite-menu .dropdown-item .nav-external-arrow {
    transform: translateY(-.075em);
    stroke-width: 1.5;
}
html body #gnb.has-mega-menu #navMenu .nav-kimite-menu .dropdown-item .nav-external-arrow path {
    vector-effect: none;
}

/* Animate one color channel; labels and SVG strokes inherit its intermediate
   value instead of switching their text fill independently. */
html body #gnb.has-mega-menu #navMenu.nav-center :is(.nav-item, .dropdown-item),
html body #gnb.has-mega-menu .nav-account {
    -webkit-text-fill-color: currentColor !important;
    transition: color .3s ease !important;
}
html body #gnb.has-mega-menu #navMenu :is(.nav-menu-label, .nav-external-label, .nav-external-arrow) {
    color: inherit !important;
    -webkit-text-fill-color: currentColor !important;
    transition: none !important;
}
@media (prefers-reduced-motion: reduce) {
    html body #gnb.has-mega-menu #navMenu.nav-center :is(.nav-item, .dropdown-item),
    html body #gnb.has-mega-menu .nav-account,
    html body #gnb.has-mega-menu .nav-menu-label::after { transition: none !important; }
}

/* Brighter light-mode menu glass stays translucent over the home video. */
@media (min-width: 1401px) {
    body.light-mode #gnb.has-mega-menu.is-mega-open .header-menu-backdrop {
        backdrop-filter: blur(64px) saturate(140%);
        -webkit-backdrop-filter: blur(64px) saturate(140%);
    }
}

/* Keep the same underline for the current section, including child routes. */
html body #gnb.has-mega-menu #navMenu .nav-item:is(.active,[aria-current="page"]) .nav-menu-label::after {
    transform:scaleX(1);
}