header.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: saturate(1.2) blur(6px);
    border-bottom: 1px solid var(--border);
}

.site-header .container {
    padding-left: 1.25rem;
}

.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand {
    font-weight: 500;
    letter-spacing: 0.2px;
    text-decoration: none;
    font-size: 2rem;
    color: var(--fg);
}

a.brand {
    text-decoration: none;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 1rem;
    align-items: center;
}

nav li {
    position: relative;
}

nav a.nav-link {
    color: var(--fg);
    font-weight: 600;
    padding: 0.5rem 0.25rem;
    border-radius: 8px;
    position: relative;
    text-decoration: none;
}

nav a.nav-link:hover,
nav a.nav-link:focus {
    outline: none;
    text-decoration: none;
}

/* Underline-from-center animation for header menu */
.site-header nav a.nav-link::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0.2rem;
    height: 2px;
    width: 100%;
    background: var(--accent);
    border-radius: 2px;
    transform: translateX(-50%) scaleX(0);
    transform-origin: 50% 50%;
    transition: transform 240ms ease;
    pointer-events: none;
}

.site-header nav a.nav-link:hover::after,
.site-header nav a.nav-link:focus::after {
    transform: translateX(-50%) scaleX(1);
}

/* Apply the same underline animation to the Others summary */
details.dropdown>summary {
    position: relative;
}

details.dropdown>summary::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0.2rem;
    height: 2px;
    width: 100%;
    background: var(--accent);
    border-radius: 2px;
    transform: translateX(-50%) scaleX(0);
    transform-origin: 50% 50%;
    transition: transform 240ms ease;
    pointer-events: none;
}

details.dropdown:hover>summary::after,
details.dropdown[open]>summary::after,
details.dropdown>summary:focus::after {
    transform: translateX(-50%) scaleX(1);
}

/* Accessible dropdown via <details> */
details.dropdown {
    position: relative;
}

details.dropdown>summary {
    list-style: none;
    cursor: pointer;
    user-select: none;
    padding: 0.5rem 0.5rem;
    border-radius: 8px;
    font-weight: 700;
    color: var(--fg);
}

details.dropdown>summary::-webkit-details-marker {
    display: none;
}

.dropdown-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 0.35rem;
    min-width: 200px;
}

.dropdown-menu a {
    display: block;
    padding: 0.6rem 0.75rem;
    border-radius: 8px;
    color: var(--fg);
    font-weight: 600;
}

.dropdown-menu a:hover,
.dropdown-menu a:focus {
    background: var(--chip);
    outline: none;
    text-decoration: none;
}

/* Hover open on pointer devices */
@media (hover:hover) and (pointer:fine) {

    details.dropdown:hover[open] .dropdown-menu,
    details.dropdown:hover .dropdown-menu {
        display: block;
    }
}