.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background-color: var(--color-bg-translucent);
    backdrop-filter: blur(10px);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

/* Drop the header below any full-screen overlay (glightbox, modals) */
.glightbox-open .site-header,
body.modal-open .site-header {
    z-index: 0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--nav-padding-y) var(--space-8);
    border-bottom: 1px solid var(--color-border-nav);
    box-sizing: border-box;
    position: relative;
    z-index: 1;
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    margin-right: var(--space-6);
    font-size: 25px;
    color: var(--color-text);
    font-weight: 300;
    text-decoration: none;
}

.nav-logo img,
.nav-logo svg {
    vertical-align: middle;
}

.desktop-menu {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-6);
}

.desktop-menu-part {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    display: flex;
    align-items: center;
    list-style: none;
}

.navbar .divider {
    width: 1px;
    height: 20px;
    background: #929292a1;
    display: block;
}

.nav-link {
    gap: 10px;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    font-weight: 500;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    border: none;
    background: transparent;
    position: relative;
    font-size: 0.9rem;
    cursor: pointer;
    transform: translateY(0);
    white-space: nowrap;
}

.nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--color-hover);
    border-radius: var(--radius-md);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: -1;
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link:hover::before {
    opacity: 1;
}

.nav-link svg {
    width: 20px;
    height: 20px;
}

.nav-item.active .nav-link {
    background-color: rgb(102 142 226 / 12%);
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    align-items: center;
}

.nav-toggle-checkbox {
    display: none;
}

.nav-toggle-label {
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: var(--space-3);
    font-size: var(--fs-xl);
    color: var(--color-text);
    transition: all var(--transition-base);
}

.mobile-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4) var(--space-8);
    z-index: 100;
    list-style: none;
    margin: 0;
}

.mobile-nav .nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    width: 100%;
    flex-direction: column;
    gap: 0px;
}

.mobile-nav .nav-item {
    margin: var(--space-1) 0;
    width: 100%;
    list-style: none;
}

.mobile-nav .nav-link {
    width: 100%;
    display: flex;
    padding: var(--space-2) var(--space-4);
    gap: 10px;
    justify-content: flex-start;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.dark-theme .navbar {
    fill: white;
    stroke: white;
}

.dark-theme .nav-link svg {
    fill: var(--color-text);
    stroke: var(--color-text);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
    list-style: none;
    margin: 0;
    padding: 0;
}

.sub-navbar {
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-8);
    border-bottom: 1px solid var(--color-border);
    box-sizing: border-box;
}

/* ── Desktop group ─────────────────────────────────────────────────────── */

.nav-group {
    display: flex;
    align-items: center;
}

.nav-group-label {
    font-weight: 600;
}

.nav-group-items {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

/* ── Mobile submenu ────────────────────────────────────────────────────── */

.has-submenu {
    display: block;
}

nav.sub-navbar .navbar-container {
    justify-content: start;
}
.mobile-group-toggle {
  display: none;
}

.has-submenu > .nav-link {
  justify-content: space-between;
  position: relative;
  width: -webkit-fill-available;
}

.has-submenu .submenu {
  display: none;
  flex-direction: column;
  padding-left: var(--space-4);
}

.mobile-group-toggle:checked + .nav-link + .submenu {
  display: flex;
}

.has-submenu > .nav-link::after {
  content: '▸';
  transition: transform 0.3s;
  padding: 0px 10px;
}

.mobile-group-toggle:checked + .nav-link::after {
  transform: rotate(90deg);
}


/* ── Nav hover highlight ───────────────────────────────────────────────── */

.nav-hover-highlight {
    position: absolute;
    border-radius: var(--radius-md);
    background: var(--color-hover);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease, left 0.18s ease, top 0.18s ease, width 0.18s ease, height 0.18s ease;
    z-index: 0;
}

.nav-hover-highlight.visible {
    opacity: 1;
}

.desktop-menu-part .nav-link {
    z-index: 1;
}

/* ── Desktop dropdown ──────────────────────────────────────────────────── */

.nav-dropdown-wrapper {
    position: relative;
}

/* transparent bridge fills the gap so the mouse can reach the panel */
.nav-dropdown-wrapper::after {
    content: '';
    position: absolute;
    top: 100%;
    left: -16px;
    right: -16px;
    height: 12px;
}

.nav-dropdown-trigger {
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-arrow {
    display: inline-block;
    width: 8px;
    height: 8px;
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.nav-dropdown-wrapper.is-open .dropdown-arrow {
    transform: rotate(180deg);
}

.nav-dropdown-panel {
    display: block;
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    translate: -50% 0;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 10px);
    padding: var(--space-4) var(--space-3);
    min-width: 260px;
    list-style: none;
    margin: 0;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    transform-origin: top center;
    z-index: calc(var(--z-header, 100) + 10);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-6px) scale(0.97);
    transition: opacity 0.18s ease, transform 0.2s ease, visibility 0.18s;
}

.nav-dropdown-wrapper:hover .nav-dropdown-panel {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.nav-dropdown-grid {
    display: grid;
    gap: 0;
}

.nav-dropdown-panel .nav-item {
    width: 100%;
}

.nav-dropdown-panel .nav-item + .nav-item {
    margin-top: var(--space-1);
    padding-top: var(--space-1);
}

.nav-dropdown-panel .dropdown-item {
    width: 100%;
    justify-content: flex-start;
    padding: var(--space-3) var(--space-5);
    font-size: 0.875rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    border-radius: var(--radius-md);
    height: auto;
}

.dropdown-item-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text);
    line-height: 1.3;
}

.dropdown-item-desc {
    font-size: 0.8rem;
    color: var(--color-text-light);
    font-weight: 400;
    line-height: 1.4;
}

/* small arrow caret pointing up from the panel */
.nav-dropdown-panel::before {
    content: '';
    position: absolute;
    top: -5px;
    left: 50%;
    translate: -50% 0;
    width: 8px;
    height: 8px;
    background: var(--color-white);
    border-left: 1px solid var(--color-border);
    border-top: 1px solid var(--color-border);
    rotate: 45deg;
}

@media (max-width: 1024px) {
    .site-header {
        background-color: var(--color-bg);
    }

    .sub-navbar {
        display: none;
    }

    .desktop-menu {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle-checkbox:checked ~ .mobile-nav,
    .nav-toggle .nav-toggle-checkbox:checked ~ .mobile-nav {
        display: block;
    }

    .navbar:has(.nav-toggle-checkbox:checked) .mobile-nav {
        display: block;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-padding-y: 0.3rem;
    }

    .navbar {
        padding: var(--space-1) var(--space-2);
    }
}