@layer components {
  .site-header {
    position: relative;
    z-index: 1000;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
  }

  .site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    min-height: 4.5rem;
    padding-block: var(--space-2);
  }

  .site-header__brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
    text-decoration: none;
    color: var(--color-text);
  }

  .site-header__logo {
    width: 3rem;
    height: 3rem;
    object-fit: contain;
    border-radius: var(--radius-small);
  }

  .site-header__brand-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
  }

  .site-header__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.3125rem;
    width: var(--min-target-size);
    height: var(--min-target-size);
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-small);
    cursor: pointer;
    transition: background-color var(--transition-fast);
  }

  .site-header__toggle:hover {
    background-color: color-mix(in srgb, var(--color-vert-sauge) 12%, transparent);
  }

  .site-header__toggle:focus-visible {
    outline: 2px solid var(--color-focus-ring);
    outline-offset: 2px;
  }

  .site-header__toggle-line {
    display: block;
    width: 1.5rem;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 1px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
    transform: translateY(0.4375rem) rotate(45deg);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
    opacity: 0;
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
    transform: translateY(-0.4375rem) rotate(-45deg);
  }

  .site-header__nav {
    display: flex;
    align-items: center;
  }

  .site-header__nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .site-header__nav-item {
    margin: 0;
    padding: 0;
  }

  .site-header__nav-link {
    display: inline-flex;
    align-items: center;
    min-height: var(--min-target-size);
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-body-size);
    font-weight: 500;
    line-height: 1.2;
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-small);
    transition: color var(--transition-fast), background-color var(--transition-fast);
  }

  .site-header__nav-link:hover {
    color: var(--color-primary-hover);
    background-color: color-mix(in srgb, var(--color-vert-sauge) 8%, transparent);
  }

  .site-header__nav-link:focus-visible {
    outline: 2px solid var(--color-focus-ring);
    outline-offset: 2px;
  }

  @media (max-width: 64rem) {
    .site-header__toggle {
      display: flex;
    }

    .site-header__nav {
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      z-index: 999;
      display: none;
      background-color: var(--color-background);
      border-bottom: 1px solid var(--color-border);
      box-shadow: var(--shadow-soft);
      max-height: calc(100vh - 4.5rem);
      overflow-y: auto;
      padding: var(--space-4);
    }

    .site-header__nav.is-open {
      display: block;
    }

    .site-header__nav-list {
      flex-direction: column;
      align-items: stretch;
      gap: var(--space-2);
    }

    .site-header__nav-link {
      display: flex;
      width: 100%;
      padding: var(--space-3) var(--space-4);
      font-size: var(--text-body-large-size);
    }
  }

  @media (max-width: 48rem) {
    .site-header__inner {
      min-height: 4rem;
      padding-block: var(--space-1);
    }

    .site-header__logo {
      width: 2.5rem;
      height: 2.5rem;
    }

    .site-header__brand-text {
      font-size: 1.125rem;
    }

    .site-header__nav {
      max-height: calc(100vh - 4rem);
    }
  }
}