.bmds-skiplink {
    position: absolute;
    inset-inline-start: var(--kern-metric-space-default);
    top: -100%;
    z-index: 100;
    padding: var(--kern-metric-space-small) var(--kern-metric-space-default);
    background: var(--bmds-surface-accent);
    color: var(--bmds-on-surface-accent);
    font-weight: var(--kern-typography-font-weight-semi-bold);
    text-decoration: none;
}
.bmds-skiplink:focus { top: 0; }

.bmds-header {
    background: var(--kern-color-layout-background-default);
    border-bottom: var(--kern-metric-border-width-bold) solid var(--kern-color-layout-text-default);
    z-index: 40;
}

/* Ohne JS steht das Menue auf schmalen Schirmen dauerhaft offen, eine
   klebende Kopfzeile wuerde dann den halben Bildschirm verdecken. */
@media (min-width: 1121px), (scripting: enabled) {
    .bmds-header {
        position: sticky;
        top: 0;
    }
}

/* Bewusst ohne `max-width`: die Kopfzeile sitzt als einziges Element
   randbuendig am Fenster. */
.bmds-header__bar {
    padding: var(--kern-metric-space-default) var(--bmds-gutter);
    display: flex;
    align-items: center;
    gap: var(--kern-metric-space-large);
    flex-wrap: wrap;
}

.bmds-header__brand { margin-inline-end: auto; }
.bmds-header .kern-btn .kern-label { font-size: var(--bmds-size-small); }

.bmds-header__logo { display: block; height: 3.5rem; width: auto; }

.bmds-header__toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: var(--kern-metric-border-width-light) solid var(--kern-color-layout-border);
    border-radius: var(--kern-metric-border-radius-default);
    color: inherit;
}
.bmds-header__toggle-bars,
.bmds-header__toggle-bars::before,
.bmds-header__toggle-bars::after {
    display: block;
    width: var(--kern-metric-dimension-small);
    height: var(--kern-metric-border-width-default);
    margin-inline: auto;
    background: currentColor;
    content: "";
}
.bmds-header__toggle-bars::before { transform: translateY(-6px); }
.bmds-header__toggle-bars::after  { transform: translateY(4px); }

.bmds-nav {
    display: flex;
    align-items: center;
    gap: var(--kern-metric-space-large);
}

.bmds-nav__list {
    display: flex;
    gap: var(--kern-metric-space-large);
    list-style: none;
    margin: 0;
    padding: 0;
}

.bmds-nav__link {
    text-decoration: none;
    font-size: var(--bmds-size-small);
    font-weight: var(--kern-typography-font-weight-semi-bold);
    padding-block: var(--kern-metric-space-x-small);
    border-bottom: var(--kern-metric-border-width-bold) solid transparent;
    white-space: nowrap;
}
.bmds-nav__link:hover,
.bmds-nav__item--active > .bmds-nav__link { border-bottom-color: var(--bmds-surface-accent); }

/* 1120px, weil die Zeile darunter fuer alle Punkte und den Button nicht
   mehr ohne Umbruch reicht. */
@media (max-width: 1120px) {
    .bmds-nav {
        flex-basis: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: var(--kern-metric-space-default);
        padding-top: var(--kern-metric-space-default);
    }
    .bmds-nav__list { flex-direction: column; gap: var(--kern-metric-space-small); }
}

@media (max-width: 1120px) and (scripting: enabled) {
    .bmds-header {
        max-height: 100vh;
        max-height: 100dvh;
        overflow-y: auto;
        overscroll-behavior: contain;
    }
    .bmds-header__toggle { display: block; }
    .bmds-header__toggle[aria-expanded="false"] + .bmds-nav { display: none; }
}

/* Der Kontrastmodus ersetzt Flaechenfarben und macht transparente
   Raender sichtbar. */
@media (forced-colors: active) {
    .bmds-header__toggle-bars,
    .bmds-header__toggle-bars::before,
    .bmds-header__toggle-bars::after {
        forced-color-adjust: none;
        background: ButtonText;
    }
    .bmds-nav__link { border-bottom-color: Canvas; }
    .bmds-nav__link:hover,
    .bmds-nav__item--active > .bmds-nav__link { border-bottom-color: LinkText; }
}