/**
 * Kopfzeile: schmal, Grund wie die Seite, 1 px Kontur unten. Logo links,
 * Navigation klein und gedämpft (aktiv: Standardfarbe + dezente Fläche),
 * rechts das Konto-Menü.
 * Unter 48rem: Zeile 1 Logo und Konto-Menü (details/summary, ohne JavaScript),
 * Zeile 2 Navigation, bei Bedarf in der Leiste waagerecht scrollbar.
 * Ab 48rem: alles in einer Zeile. Ab 80rem liegt das Konto-Menü offen daneben, sofern
 * der Browser ::details-content kennt; sonst und darunter bleibt es ein Menü.
 */
@layer components {
  .site-header {
    border-block-end: var(--border-width-thin) solid var(--theme-nav-border);
    background-color: var(--theme-nav-bg);
    color: var(--theme-nav-text);
  }

  .site-header__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: var(--space-3);
    padding-block: var(--space-1);
  }

  .site-header__inner > nav {
    grid-column: 1 / -1;
    grid-row: 2;
    min-inline-size: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .site-header__brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--theme-nav-text);
    font-size: var(--font-size-card-title);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-tight);
    text-decoration: none;
  }

  .logo {
    flex-shrink: 0;
    block-size: 1.25rem;
    inline-size: auto;
  }

  .site-header__nav {
    display: flex;
    gap: var(--space-1);
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .site-header__link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    min-block-size: 2.75rem;
    padding: var(--space-2) var(--space-3);
    white-space: nowrap;
    border-radius: var(--radius-md);
    color: var(--theme-nav-text-muted);
    font-size: var(--font-size-label);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition:
      background-color var(--motion-duration-ui) var(--motion-ease),
      color var(--motion-duration-ui) var(--motion-ease);
  }

  @media (hover: hover) and (pointer: fine) {
    .site-header__link:hover {
      background-color: var(--theme-nav-hover);
      color: var(--theme-nav-text);
    }
  }

  .site-header__link[aria-current="page"] {
    background-color: var(--theme-nav-active);
    color: var(--theme-nav-text);
  }

  .account-menu {
    position: relative;
    color: var(--theme-meta-color);
    font-size: var(--font-size-small);
  }

  .account-menu__toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    min-block-size: 2.75rem;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--theme-nav-text-muted);
    font-size: var(--font-size-label);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    list-style: none;
  }

  .account-menu__toggle::-webkit-details-marker {
    display: none;
  }

  .account-menu[open] > .account-menu__toggle {
    background-color: var(--theme-nav-hover);
    color: var(--theme-nav-text);
  }

  @media (hover: hover) and (pointer: fine) {
    .account-menu__toggle:hover {
      background-color: var(--theme-nav-hover);
      color: var(--theme-nav-text);
    }
  }

  .account-menu__panel {
    position: absolute;
    inset-block-start: calc(100% + var(--space-1));
    inset-inline-end: 0;
    z-index: var(--z-header);
    display: grid;
    gap: var(--space-3);
    justify-items: start;
    inline-size: max-content;
    min-inline-size: 14rem;
    max-inline-size: calc(100vw - 2 * var(--gutter));
    padding: var(--space-4);
    border: var(--border-width-thin) solid var(--theme-floating-border);
    border-radius: var(--radius-xl);
    background-color: var(--theme-floating-bg);
    box-shadow: var(--shadow-overlay);
  }

  .account-menu__who {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
  }

  .account-menu__email {
    overflow-wrap: anywhere;
  }

  .site-header__meta-link {
    display: inline-flex;
    align-items: center;
    min-block-size: 2.75rem;
    color: var(--theme-meta-color);
  }

  @media (hover: hover) and (pointer: fine) {
    .site-header__meta-link:hover {
      color: var(--theme-nav-text);
    }
  }

  .site-header__logout {
    margin: 0;
  }
}

@layer components {
  @media (min-width: 48rem) {
    .site-header__inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: var(--space-2) var(--space-6);
      padding-block: var(--space-2);
    }

    .site-header__inner > nav {
      overflow-x: visible;
    }

    .site-header__link {
      min-block-size: 2rem;
      padding-block: var(--space-1);
    }

    .site-header__meta-link {
      min-block-size: 0;
    }
  }

  @media (min-width: 80rem) {
    @supports selector(::details-content) {
      .account-menu__toggle {
        display: none;
      }

      .account-menu::details-content {
        content-visibility: visible;
      }

      .account-menu__panel {
        position: static;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: var(--space-2) var(--space-4);
        inline-size: auto;
        min-inline-size: 0;
        max-inline-size: none;
        padding: 0;
        border: 0;
        background-color: transparent;
        box-shadow: none;
      }
    }
  }
}

/* Suche in der Kopfzeile (AP-44): Feld ab 64rem, darunter Icon-Link; beides in .site-header__tools. */
@layer components {
  .header-search {
    position: relative;
    display: none;
  }

  .header-search__icon {
    position: absolute;
    inset-block: 0;
    inset-inline-start: var(--space-3);
    display: flex;
    align-items: center;
    color: var(--theme-meta-color);
    pointer-events: none;
  }

  .header-search__input {
    min-block-size: 2rem;
    inline-size: 12rem;
    padding-block: var(--space-1);
    padding-inline-start: calc(var(--space-3) + 1.5rem);
    font-size: var(--font-size-label);
    transition:
      border-color var(--motion-duration-ui) var(--motion-ease),
      inline-size var(--motion-duration-menu) var(--motion-ease);
  }

  .header-search__input:focus-visible {
    inline-size: 16rem;
  }

  .header-search-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-block-size: 2.75rem;
    min-inline-size: 2.75rem;
    border-radius: var(--radius-md);
    color: var(--theme-nav-text-muted);
  }

  @media (hover: hover) and (pointer: fine) {
    .header-search-link:hover {
      background-color: var(--theme-nav-hover);
      color: var(--theme-nav-text);
    }
  }

  @media (min-width: 64rem) {
    .header-search {
      display: block;
    }

    .header-search-link {
      display: none;
    }
  }
}