@layer components {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border-soft);
    padding-block: var(--space-3);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: nowrap;
  }

  .brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--color-primary-dark);
    flex-shrink: 0;
    min-width: 0;
  }

  .brand-mark {
    width: 48px;
    height: 48px;
    object-fit: contain;
    flex-shrink: 0;
  }

  .brand-text {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    color: var(--color-primary-dark);
    white-space: nowrap;
  }

  .menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-shrink: 0;
  }

  .menu-toggle-line {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-primary-dark);
    border-radius: 1px;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .menu-toggle[aria-expanded='true'] .menu-toggle-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .menu-toggle[aria-expanded='true'] .menu-toggle-line:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle[aria-expanded='true'] .menu-toggle-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .menu-toggle:focus-visible {
    outline: var(--focus-ring-width) solid var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
  }

  .primary-nav {
    display: flex;
    align-items: center;
    flex-shrink: 1;
    min-width: 0;
  }

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

  .primary-nav-list li {
    margin: 0;
    padding: 0;
  }

  .primary-nav-list a {
    display: inline-flex;
    align-items: center;
    min-height: var(--touch-target-min);
    padding-inline: var(--space-2);
    font-family: var(--font-heading);
    font-size: var(--font-size-body);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.2s ease, background-color 0.2s ease;
  }

  .primary-nav-list a:hover {
    color: var(--color-primary-dark);
    background-color: var(--color-surface-tint);
  }

  .primary-nav-list a:focus-visible {
    outline: var(--focus-ring-width) solid var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
    border-radius: var(--radius-small);
  }

  @media (max-width: 767px) {
    .menu-toggle {
      display: flex;
    }

    .primary-nav {
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background-color: var(--color-surface);
      border-bottom: 1px solid var(--color-border-soft);
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      display: block;
      z-index: 999;
    }

    .primary-nav.is-open {
      max-height: calc(100vh - 100px);
      overflow-y: auto;
    }

    .primary-nav-list {
      flex-direction: column;
      align-items: stretch;
      gap: 0;
      padding: var(--space-4);
    }

    .primary-nav-list li {
      width: 100%;
    }

    .primary-nav-list a {
      display: flex;
      width: 100%;
      padding: var(--space-3) var(--space-4);
      border-radius: var(--radius-small);
    }
  }

  @media (min-width: 768px) {
    .brand-text {
      font-size: 1.25rem;
    }

    .brand-mark {
      width: 48px;
      height: 48px;
    }
  }

  @media (min-width: 1024px) {
    .primary-nav-list {
      gap: var(--space-6);
    }
  }
}