@layer components {
  .site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--block-space);
    padding-block: var(--block-space);
    position: relative;
    z-index: var(--z-header);
  }

  /* A long wordmark wraps on a phone: a size down, even lines, and room to breathe between them. */
  .site-header__brand {
    display: inline-flex;
    align-items: center;
    min-inline-size: 0;
    line-height: 1.2;
    text-wrap: balance;
    font-family: var(--font-display);
    font-size: var(--text-normal);
    font-weight: 600;
    letter-spacing: var(--tracking-tight);
    color: var(--color-text);
  }
  .site-header__brand:hover { color: var(--color-brand-strong); text-decoration: none; }
  /* An optional masthead logo (Site::Settings#logo) sits before the wordmark. Sized by height so
     any aspect ratio fits the bar; the box in logo.rb caps the served pixels. */
  .site-header__logo { block-size: 2rem; inline-size: auto; margin-inline-end: var(--inline-space-half); }
  .site-header__tagline {
    display: block;
    font-family: var(--font-sans);
    font-size: var(--text-small);
    font-weight: 400;
    letter-spacing: normal;
    color: var(--color-muted);
  }

  .site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--inline-space);
  }

  /* Sign-in link shown in place of the account menu for logged-out visitors; the admin link sits
     beside the account menu for managers. */
  .site-header__signin,
  .site-header__admin { font-size: var(--text-small); font-weight: 500; color: var(--color-subtle); }
  .site-header__signin:hover,
  .site-header__admin:hover { color: var(--color-brand-strong); text-decoration: none; }

  /* Hamburger — a round icon button, visible on small screens only. */
  .site-header__menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    inline-size: var(--control-size);
    block-size: var(--control-size);
    padding: 0;
    color: var(--color-subtle);
    background: var(--color-surface-raised);
    border: var(--border);
    border-radius: 50%;
    cursor: pointer;
    transition: color var(--transition), border-color var(--transition);
  }
  .site-header__menu-toggle:hover { color: var(--color-text); border-color: var(--color-border-strong); }
  .site-header__menu-icon { inline-size: 1.15rem; block-size: 1.15rem; }

  /* Nav — mobile-first: a dropdown panel the hamburger reveals. The Menu::Tree inside
     it is styled in menu.css. */
  .site-header__nav {
    display: none;
    position: absolute;
    inset-block-start: calc(100% + var(--inline-space-half));
    inset-inline: 0;
    z-index: var(--z-dropdown);
    flex-direction: column;
    align-items: stretch;
    gap: var(--inline-space-half);
    padding: var(--block-space);
    background: var(--color-surface-raised);
    border: var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-large);
  }
  .site-header[data-open] .site-header__nav { display: flex; }

  .site-header__nav a {
    color: var(--color-subtle);
    text-decoration: none;
    padding-block: 0.35em;
    transition: color var(--transition);
  }
  .site-header__nav a:hover { color: var(--color-text); }

  /* ── Desktop: brand · centered menu · controls, no hamburger ── */
  @media (min-width: 40rem) {
    .site-header {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      align-items: center;
      padding-block: var(--block-space-double);
    }
    .site-header__brand { justify-self: start; line-height: 1; font-size: var(--text-large); }
    .site-header__actions { justify-self: end; }
    .site-header__menu-toggle { display: none; }

    .site-header__nav {
      display: flex;
      position: static;
      justify-self: center;
      flex-direction: row;
      justify-content: center;
      align-items: center;
      gap: var(--inline-space-double);
      padding: 0;
      background: none;
      border: none;
      border-radius: 0;
      box-shadow: none;
      font-size: var(--text-small);
    }

    /* Nav links grow a clay underline on hover — a small editorial flourish. */
    .site-header__nav a {
      padding-block: 0.15em;
      border-block-end: 2px solid transparent;
      transition: color var(--transition), border-color var(--transition);
    }
    .site-header__nav a:hover { border-block-end-color: var(--color-clay); }
  }
}