.site-header {
    --header-background: var(--color-background);
    --header-backdrop: none;
    --navigation-hover-background: var(--color-surface);
    --navigation-hover-color: var(--color-text);
    --navigation-hover-outline: transparent;
    isolation: isolate;
    background: transparent;
}
/* Getrennte Hintergrundebene: Das ausklappende Menü kann den Seiteninhalt
   ebenfalls weichzeichnen, ohne einen verschachtelten Backdrop-Filter. */
.site-header::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: var(--header-background);
    -webkit-backdrop-filter: var(--header-backdrop);
    backdrop-filter: var(--header-backdrop);
    transition: background-color 160ms ease;
}
/* Ohne Filter-Unterstützung bleibt der Header vollständig deckend. */
@supports ((backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px))) {
    .site-header.is-scrolled {
        --color-text: var(--color-header-scrolled-text);
        --color-muted: var(--color-header-scrolled-muted);
        --navigation-hover-background: var(--color-border);
        --navigation-hover-outline: var(--color-navigation-hover-border);
        --header-background: var(--color-header-translucent);
        --header-backdrop: blur(12px);
    }
}
@media (prefers-reduced-transparency: reduce), (forced-colors: active) {
    .site-header.is-scrolled {
        --navigation-hover-background: var(--color-surface);
        --navigation-hover-color: var(--color-text);
        --navigation-hover-outline: transparent;
        --header-background: var(--color-background);
        --header-backdrop: none;
    }
}
.header-content-authenticated {
    /* Bei vergrößerter Schrift dürfen Logo und Aktionen eigene Zeilen belegen. */
    gap: 0.5rem;
}
.header-content-authenticated .site-brand { flex-shrink: 0; }
.primary-navigation-shell { display: grid; grid-template-rows: 1fr; grid-column: 1 / -1; grid-row: 2; min-width: 0; flex-basis: 100%; order: 1; }
.header-navigation-pending .primary-navigation-shell { display: none; }
.primary-navigation-clip { min-height: 0; overflow: visible; }
.header-navigation-ready .primary-navigation-clip { overflow: hidden; }
.header-navigation-ready .primary-navigation-shell.is-expanded .primary-navigation-clip { overflow: visible; }
.primary-navigation { display: grid; grid-template-columns: minmax(0, 1fr); align-items: start; gap: 0.25rem 0.5rem; padding-block: 0.5rem 0.75rem; border-top: 1px solid var(--color-border); }
.header-navigation-ready .primary-navigation-shell {
    position: absolute;
    top: 100%;
    inset-inline: 0;
    padding-inline: var(--space-medium);
    max-block-size: calc(100dvh - var(--site-header-height, 6rem) - 0.5rem);
    overflow-y: auto;
    background: var(--header-background);
    -webkit-backdrop-filter: var(--header-backdrop);
    backdrop-filter: var(--header-backdrop);
    border-bottom: 1px solid var(--color-border);
    grid-template-rows: 0fr;
    opacity: 0;
    visibility: hidden;
    /* Auch am Desktop-Breakpoint sofort verbergen, statt die alte Navigation auszufaden. */
    transition: grid-template-rows 180ms ease, opacity 120ms ease, background-color 160ms ease;
}
.header-navigation-ready .primary-navigation-shell.is-open {
    grid-template-rows: 1fr;
    opacity: 1;
    visibility: visible;
}
.mobile-navigation-toggle { display: inline-flex; }
.mobile-navigation-toggle[aria-expanded="true"] { color: var(--color-accent); background: var(--color-surface); }
.primary-navigation > a, .nav-group > summary {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    min-height: 2.75rem;
    padding: 0.5rem 0.75rem;
    color: var(--color-text);
    font-size: 0.9375rem;
    overflow-wrap: anywhere;
    text-decoration: none;
    border-radius: var(--radius-control);
    transition: background-color 140ms ease-out, box-shadow 140ms ease-out;
}
.primary-navigation > a[aria-current="page"], .nav-group > summary[aria-current="true"],
.nav-dropdown a[aria-current="page"], .profile-panel a[aria-current="page"] { color: var(--color-accent); background: var(--color-surface); }
.primary-navigation > a:hover, .nav-group > summary:hover,
.nav-group[open] > summary { background: var(--color-surface); }
@media (min-width: 64rem) {
    .primary-navigation > a:not([aria-current="page"]):hover,
    .nav-group > summary:not([aria-current="true"]):hover,
    .nav-group[open] > summary:not([aria-current="true"]) {
        background: var(--navigation-hover-background);
        color: var(--navigation-hover-color);
    }
}
.primary-navigation > .nav-games { min-width: 2.75rem; }
.games-icon { display: block; flex: none; width: 1.5rem; height: 1.5rem; }
.nav-group { position: relative; min-width: 0; }
.site-header summary { list-style: none; cursor: pointer; }
.site-header summary::-webkit-details-marker { display: none; }
.nav-group summary .ui-icon, .profile-control > .ui-icon { width: 0.875rem; height: 0.875rem; }
.ui-icon { flex-shrink: 0; vertical-align: middle; }
.header-actions { position: relative; display: flex; align-items: center; flex-wrap: wrap; max-width: 100%; margin-inline-start: auto; gap: 0.25rem; grid-column: 2; grid-row: 1; }
.icon-control, .profile-control {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.75rem;
    min-height: 2.75rem;
    border: 0;
    border-radius: var(--radius-control);
    background: transparent;
    color: var(--color-muted);
    cursor: pointer;
    font: inherit;
}
.icon-control { position: relative; }
.icon-control:not(.notification-control):hover, .profile-control:hover,
.header-dropdown[open] > summary,
.header-dropdown > summary:not(.notification-control)[aria-current="true"] { color: var(--color-accent); background: var(--color-surface); }
.notification-control:hover { background: var(--color-surface); }
.profile-control { gap: 0.5rem; padding-inline: 0.25rem; transition: background-color 140ms ease-out, box-shadow 140ms ease-out; }
.profile-control > .ui-icon { display: none; }
.profile-avatar { display: grid; place-items: center; width: 2.25rem; height: 2.25rem; border: 1px solid var(--color-border); border-radius: 50%; background: var(--color-surface); color: inherit; }
@media (hover: hover) and (pointer: fine) {
    .primary-navigation > a:hover,
    .nav-group > summary:hover,
    .header-dropdown > .notification-control:hover,
    .header-dropdown:hover > .profile-control {
        background: var(--navigation-hover-background);
        box-shadow: inset 0 0 0 1px var(--navigation-hover-outline);
    }
    .header-dropdown:not([open]) > .notification-control:hover {
        background: var(--navigation-hover-background);
        color: var(--navigation-hover-color);
    }
    .header-dropdown:is(:hover, [open]) > .profile-control:not([aria-current="true"]) {
        background: var(--navigation-hover-background);
        color: var(--navigation-hover-color);
    }
    [data-header-hover][open] > summary:not([aria-current="true"]) {
        background: var(--navigation-hover-background);
        box-shadow: inset 0 0 0 1px var(--navigation-hover-outline);
    }
}
.site-header.is-scrolled .primary-navigation > a[aria-current="page"],
.site-header.is-scrolled .nav-group > summary[aria-current="true"],
.site-header.is-scrolled .header-dropdown > .profile-control[aria-current="true"] {
    background: var(--navigation-hover-background);
    box-shadow: inset 0 0 0 1px var(--navigation-hover-outline);
}
.notification-badge { position: absolute; top: 0.125rem; right: 0.125rem; display: grid; place-items: center; min-width: 1.125rem; height: 1.125rem; padding-inline: 0.25rem; border: 2px solid var(--color-background); border-radius: 1rem; background: var(--color-accent); color: var(--color-on-accent); font-size: 0.625rem; font-weight: 700; line-height: 1; pointer-events: none; }
.nav-dropdown, .notifications-panel, .profile-panel {
    position: absolute;
    top: calc(100% + 0.65rem);
    z-index: 20;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    box-shadow: 0 0.5rem 2rem var(--color-shadow);
}
.nav-dropdown { position: static; width: 100%; margin-block: 0.25rem; padding: 0.375rem; box-shadow: none; }
[data-header-hover] > :is(.nav-dropdown, .profile-panel) {
    opacity: 1;
    translate: 0 0;
    transition: opacity 140ms ease-out, translate 140ms ease-out;
}
@starting-style {
    [data-header-hover][open] > :is(.nav-dropdown, .profile-panel) {
        opacity: 0;
        translate: 0 -0.25rem;
    }
}
[data-header-hover].is-closing > :is(.nav-dropdown, .profile-panel) {
    opacity: 0;
    translate: 0 -0.25rem;
    pointer-events: none;
}
/* Dieselbe Schließphase wie beim Dropdown; aktive Seiten bleiben markiert. */
.site-header [data-header-hover].is-closing:not(:hover) > summary:not([aria-current="true"]) {
    background: transparent;
    box-shadow: inset 0 0 0 1px transparent;
}
.nav-dropdown a, .profile-panel a, .profile-panel button { display: block; width: 100%; padding: 0.75rem; border: 0; border-radius: 0.25rem; background: transparent; color: var(--color-text); font: inherit; text-align: left; text-decoration: none; cursor: pointer; }
.nav-dropdown a:hover, .profile-panel a:hover, .profile-panel button:hover { color: var(--color-accent); background: var(--color-surface); }
.notifications-panel {
    right: 0;
    width: min(24rem, calc(100vw - 2rem));
    height: 30rem;
    max-height: calc(100vh - var(--site-header-height, 6rem) - 1rem);
    max-height: calc(100dvh - var(--site-header-height, 6rem) - 1rem);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.popover-heading { display: flex; flex-shrink: 0; align-items: center; justify-content: space-between; gap: 0.5rem; padding: 0.5rem 0.75rem 0.5rem 1rem; border-bottom: 1px solid var(--color-border); }
.popover-heading h2 { min-width: 0; margin: 0; font-size: 1rem; overflow-wrap: anywhere; }
.notification-content { flex: 1; min-height: 0; overflow-y: auto; overscroll-behavior: contain; }
.notification-empty { display: flex; flex-direction: column; justify-content: center; align-items: center; min-height: 100%; margin: 0; padding: 1.5rem; color: var(--color-muted); text-align: center; overflow-wrap: anywhere; }
.notification-empty > .ui-icon { width: 2rem; height: 2rem; margin-bottom: 0.75rem; }
.notification-empty p { margin-block: 0.25rem; font-size: 0.9375rem; }
.notification-empty strong { color: var(--color-text); }
.notification-list { margin: 0; padding: 0; list-style: none; }
.notification-list li + li { border-top: 1px solid var(--color-border); }
.notification-item { display: grid; gap: 0.375rem; padding: 1rem; color: var(--color-text); text-decoration: none; overflow-wrap: anywhere; }
.notification-item:hover { background: var(--color-surface); }
.notification-item strong { font-size: 0.9375rem; }
.notification-item > span, .notification-item time { color: var(--color-muted); font-size: 0.8125rem; }
.notification-unread { border-left: 3px solid var(--color-accent); }
.notification-status { display: block; margin-top: 0.25rem; color: var(--color-accent); font-size: 0.6875rem; font-weight: 600; }
.notifications-all { flex-shrink: 0; display: block; padding: 1rem; border-top: 1px solid var(--color-border); text-align: center; text-decoration: none; font-size: 0.875rem; font-weight: 600; overflow-wrap: anywhere; }
.notifications-all:hover { background: var(--color-surface); }
.profile-panel { right: 0; width: min(13rem, calc(100vw - 2rem)); max-block-size: calc(100dvh - var(--site-header-height, 6rem) - 1rem); overflow-y: auto; padding: 0.375rem; }
.profile-menu-heading { margin: 0; padding: 0.5rem 0.75rem; color: var(--color-muted); font-size: 0.75rem; }
.profile-panel form { margin: 0.375rem 0 0; padding-top: 0.375rem; border-top: 1px solid var(--color-border); }
/* Auf schmalen Displays bleibt bei großer Schrift das gesamte Popover scrollbar. */
@media (max-width: 28rem) {
    .notifications-panel { position: fixed; top: calc(var(--site-header-height, 6rem) + 0.65rem); inset-inline: 0.5rem; width: auto; display: block; height: auto; overflow-y: auto; }
    .popover-heading { display: grid; grid-template-columns: minmax(0, 1fr) 44px; gap: 0.25rem; padding: 0.5rem; }
    .popover-heading .popover-close { min-width: 44px; min-height: 44px; width: 44px; height: 44px; padding: 0; }
    .notification-item, .notification-empty, .notifications-all { padding: 0.75rem; }
    .notification-content { overflow: visible; }
}
@media (min-width: 28rem) {
    .primary-navigation { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
/* Über den Menürand hinaus anzeigen, sobald auch vertikal genug Platz ist.
   Bei geringer Höhe bleiben die Unterlinks im gemeinsamen Scrollbereich. */
@media (min-width: 28rem) and (min-height: 26rem) {
    .header-navigation-ready .primary-navigation-shell.is-expanded { overflow: visible; }
    .nav-dropdown {
        position: absolute;
        right: 0;
        margin: 0;
        max-block-size: calc(100dvh - var(--site-header-height, 6rem) - 7.5rem);
        overflow-y: auto;
        box-shadow: 0 0.5rem 2rem var(--color-shadow);
    }
}
@media (min-width: 64rem) {
    .header-navigation-pending .primary-navigation-shell { display: grid; }
    .header-content-authenticated { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 1rem; }
    .primary-navigation-shell,
    .header-navigation-ready .primary-navigation-shell { grid-column: 2; grid-row: 1; grid-template-rows: 1fr; opacity: 1; visibility: visible; transition: none; }
    .header-navigation-ready .primary-navigation-clip { overflow: visible; }
    .header-navigation-ready .primary-navigation-shell { position: static; padding: 0; max-block-size: none; overflow: visible; background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; border: 0; }
    .primary-navigation { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; padding: 0; border: 0; }
    .mobile-navigation-toggle { display: none; }
    .header-actions { grid-column: 3; gap: 0.5rem; }
    .primary-navigation > a, .nav-group > summary { padding-inline: 0.75rem; white-space: nowrap; }
    .primary-navigation > .nav-games { justify-content: center; }
    .nav-group { position: relative; }
    .nav-dropdown { position: absolute; right: 0; width: 13rem; margin: 0; max-block-size: calc(100dvh - var(--site-header-height, 6rem) - 1.15rem); overflow-y: auto; box-shadow: 0 0.5rem 2rem var(--color-shadow); }
    .nav-games-label { display: none; }
    .profile-control > .ui-icon { display: block; }
}
@media (min-width: 70rem) {
    .header-content-authenticated { gap: 1.5rem; }
    .primary-navigation > a, .nav-group > summary { padding-inline: 1rem; }
}
@media (prefers-reduced-motion: reduce) {
    .site-header,
    .site-header::before,
    .primary-navigation > a,
    .nav-group > summary,
    .profile-control,
    [data-header-hover] > :is(.nav-dropdown, .profile-panel),
    .header-navigation-ready .primary-navigation-shell,
    .header-navigation-ready .primary-navigation-shell.is-open { transition: none; }
}