.header {
    position: sticky;
    inset-block-start: 0;
    z-index: 100;
    width: 100%;

    background: color-mix(in srgb, var(--color-bg-elevated) 78%, transparent);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    backdrop-filter: blur(16px) saturate(160%);
    border-bottom: 1px solid color-mix(in srgb, var(--color-border) 60%, transparent);

    transition-property: transform, background-color, box-shadow, border-color;
    transition-duration: var(--default-transition-duration);
    transition-timing-function: var(--default-transition-timing-function);
}

.header--scrolled {
    background: color-mix(in srgb, var(--color-bg-elevated) 94%, transparent);
    box-shadow: 0 1px 24px rgba(0, 0, 0, .08);
}

/* Solange der dunkle Hero-Banner hinter dem Header liegt (Homepage-Einstieg),
   bekommt die Glasfläche einen dunklen Ton statt der hellen Variante –
   sonst schimmert die helle Transparenz als heller Balken durch den Hero. */
.header--over-hero {
    background: color-mix(in srgb, var(--color-bg-premium) 38%, transparent);
    border-bottom-color: color-mix(in srgb, var(--color-border-premium) 70%, transparent);
}

.header--over-hero.header--scrolled {
    background: color-mix(in srgb, var(--color-bg-premium) 38%, transparent);
    box-shadow: 0 1px 24px rgba(0, 0, 0, .28);
}

.header--over-hero .header-nav__link {
    color: var(--color-text-premium-muted);
}

.header--over-hero .header-nav__link:hover,
.header--over-hero .header-nav__link:focus-visible,
.header--over-hero .header-nav__link--active {
    color: #ffffff;
}

.header--over-hero .header-nav__toggle-bar {
    background: var(--color-text-premium);
}

.header--hidden {
    transform: translateY(-100%);
}

.header__container {
    max-width: var(--container-7xl);
    width: 100%;
    margin-inline: auto;
    padding-block: calc(var(--spacing) * 4);
    padding-inline: calc(var(--spacing) * 4);

    gap: calc(var(--spacing) * 4);
    align-items: center;
    justify-content: space-between;
    display: flex;
    flex-wrap: wrap;
}



/* Header-Logo */


.header__logo {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    color: inherit;
    text-decoration: inherit;
}

.header__logo-image {
    width: calc(var(--spacing) * 12);
    height: calc(var(--spacing) * 12);
}



/* Header-Navigation */


.header-nav {
    order: 3;
    flex-basis: 100%;
}

.header-nav__toggle {
    flex-direction: column;
    gap: calc(var(--spacing) * 1.5);
    justify-content: center;
    align-items: center;
    width: calc(var(--spacing) * 10);
    height: calc(var(--spacing) * 10);
    margin-inline-start: auto;
    cursor: pointer;
    display: inline-flex;
    appearance: button;
    background: transparent;
    border-radius: calc(var(--border-radius) * .5);
    color: var(--color-text);
}

.header-nav__toggle-bar {
    width: calc(var(--spacing) * 5);
    height: 2px;
    background: currentColor;
    border-radius: 999px;
    display: block;
    transition-property: transform, opacity;
    transition-duration: var(--default-transition-duration);
    transition-timing-function: var(--default-transition-timing-function);
}

.header-nav__toggle[aria-expanded="true"] .header-nav__toggle-bar:nth-child(1) {
    transform: translateY(calc(var(--spacing) * 1.5 + 2px)) rotate(45deg);
}

.header-nav__toggle[aria-expanded="true"] .header-nav__toggle-bar:nth-child(2) {
    opacity: 0;
}

.header-nav__toggle[aria-expanded="true"] .header-nav__toggle-bar:nth-child(3) {
    transform: translateY(calc(-1 * (var(--spacing) * 1.5 + 2px))) rotate(-45deg);
}

.header-nav__list {
    flex-direction: column;
    gap: calc(var(--spacing) * 1);
    margin: 0;
    margin-top: calc(var(--spacing) * 3);
    padding: 0;
    list-style: none;
    display: none;
    border-block-start: 1px solid var(--color-border-premium);
}

.header-nav__list.is-open {
    display: flex;
}

.header-nav__item {
    display: block;
}

.header-nav__link {
    position: relative;
    color: var(--color-text-dimmed);
    padding-block: calc(var(--spacing) * 2.5);
    display: block;
    font-weight: var(--font-weight-medium);
    letter-spacing: .08em;
    text-transform: uppercase;
    transition-property: color;
    transition-duration: var(--default-transition-duration);
    transition-timing-function: var(--default-transition-timing-function);
}

.header-nav__link::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: 0;
    height: 2px;
    background: var(--color-primary);
    transform: scaleX(0);
    transform-origin: right center;
    transition: transform .3s cubic-bezier(.2, .7, .2, 1);
}

.header-nav__link:hover,
.header-nav__link:focus-visible,
.header-nav__link--active {
    color: var(--color-primary);
}

.header-nav__list.is-open {
    background:
        linear-gradient(110deg, rgba(255, 255, 255, .06), transparent 58%),
        linear-gradient(90deg, rgba(242, 243, 243, .045) 1px, transparent 1px),
        var(--design-graphite);
    background-size: 100% 100%, var(--grid-size) 100%, 100% 100%;
    border-block-end: 2px solid var(--color-primary);
    box-shadow: 0 1rem 2rem rgba(6, 8, 9, .16);
}

.header-nav__list.is-open .header-nav__link {
    color: var(--color-text-premium-muted);
    border-block-end: 1px solid rgba(242, 243, 243, .12);
}

.header-nav__list.is-open .header-nav__link:hover,
.header-nav__list.is-open .header-nav__link:focus-visible,
.header-nav__list.is-open .header-nav__link--active {
    color: #ffffff;
}

.header-nav__link:hover::after,
.header-nav__link:focus-visible::after,
.header-nav__link--active::after {
    transform: scaleX(1);
    transform-origin: left center;
}

.header-nav__submenu {
    margin: 0;
    margin-top: calc(var(--spacing) * 1);
    padding: 0;
    padding-inline-start: calc(var(--spacing) * 4);
    list-style: none;
    display: block;
    letter-spacing: .02em;
}

.header-nav__subitem {
    display: block;
}

.header-nav__sublink {
    color: var(--color-text-muted);
    padding-block: calc(var(--spacing) * 1.5);
    display: block;
    transition-property: color;
    transition-duration: var(--default-transition-duration);
    transition-timing-function: var(--default-transition-timing-function);
}

.header-nav__sublink:hover,
.header-nav__sublink:focus-visible,
.header-nav__sublink--active {
    color: var(--color-primary);
}



/* Header-CTA */


.header__cta {
    flex-shrink: 0;
    order: 2;
}



/*########## Ab Tablet (ab 768px Breite) ##########*/
@media (min-width: 48rem) {
    .header__container {
        padding-inline: calc(var(--spacing) * 6);
    }

}



/*########## Ab Desktop (ab 1024px Breite) ##########*/
@media (min-width: 64rem) {
    .header__container {
        padding-inline: calc(var(--spacing) * 8);
        flex-wrap: nowrap;
    }

    /* Header-Navigation */

    .header-nav {
        order: 2;
        flex-basis: auto;
    }

    .header-nav__toggle {
        display: none;
    }

    .header-nav__list {
        flex-direction: row;
        align-items: stretch;
        gap: calc(var(--spacing) * 6);
        margin: 0;
        display: flex;
        border: 0;
        background: transparent;
        box-shadow: none;
    }

    .header-nav__item {
        position: relative;
        display: flex;
        align-items: stretch;
    }

    .header-nav__item + .header-nav__item {
        margin-top: 0;
    }

    .header-nav__link {
        display: flex;
        align-items: center;
        min-height: 3rem;
        padding-block: calc(var(--spacing) * 1.5);
        text-align: left;
        color: var(--color-text-dimmed);
        font-size: var(--text-xs);
        line-height: 1.2;
    }

    .header-nav__list .header-nav__link {
        border: 0;
    }

    .header-nav__list .header-nav__link:hover,
    .header-nav__list .header-nav__link:focus-visible,
    .header-nav__list .header-nav__link--active {
        color: var(--color-primary);
    }

    .header-nav__submenu {
        position: absolute;
        inset-inline-start: 0;
        top: 100%;
        min-width: 12rem;
        margin-top: 0;
        padding: calc(var(--spacing) * 2);

        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--border-radius);
        box-shadow: 0 12px 24px rgba(0, 0, 0, .08);

        opacity: 0;
        visibility: hidden;
        transform: translateY(calc(var(--spacing) * -2));

        transition-property: opacity, transform, visibility;
        transition-duration: var(--default-transition-duration);
        transition-timing-function: var(--default-transition-timing-function);
    }

    .header-nav__item:hover .header-nav__submenu,
    .header-nav__item:focus-within .header-nav__submenu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .header-nav__sublink {
        padding-block: calc(var(--spacing) * 1.5);
        padding-inline: calc(var(--spacing) * 2);
        border-radius: calc(var(--border-radius) * .5);
    }

    .header-nav__sublink:hover,
    .header-nav__sublink:focus-visible {
        background: var(--color-bg-muted);
    }

    /* Header-CTA */

    .header__cta {
        order: 3;
        padding-inline: calc(var(--spacing) * 5);
    }
}



/*########## Ab Großem Desktop (ab 1440px Breite) ##########*/
@media (min-width: 90rem) {
    .header__container {
        padding-inline: 0;
    }
}