@layer components {
  .site-header {
    padding: var(--block-space) 0;
    margin-bottom: var(--block-space-half);
  }

  .site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .site-title {
    font-size: var(--text-title-3);
    font-weight: 600;
    text-decoration: none;
    color: var(--color-ink);
  }

  /* Desktop nav */
  .site-nav--desktop {
    display: flex;
    align-items: center;
    gap: clamp(var(--block-space-half), 2vw, var(--block-space-1-5));
  }

  .site-nav--desktop a {
    font-size: var(--text-body);
    font-weight: 400;
    color: var(--color-ink);
    text-decoration: none;
  }

  /* Mobile menu toggle (hidden checkbox) */
  .mobile-menu-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
  }

  /* Hamburger button */
  .mobile-menu-open {
    display: none;
    cursor: pointer;
    color: var(--color-ink);
  }

  /* Mobile nav overlay */
  .mobile-nav {
    position: fixed;
    inset: 0;
    background: var(--color-canvas);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
  }

  .mobile-nav__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--block-space);
  }

  .mobile-nav__close {
    display: flex;
    align-items: center;
    gap: var(--inline-space-half);
    cursor: pointer;
    color: var(--color-ink);
    font-size: var(--text-body);
  }

  .mobile-nav__links {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--block-space-double);
    padding: var(--block-space-double);
  }

  .mobile-nav__links a {
    font-size: var(--text-large-title);
    font-weight: 400;
    color: var(--color-ink);
    text-decoration: none;
  }

  /* Show mobile nav when toggle is checked */
  .mobile-menu-toggle:checked ~ .mobile-nav {
    opacity: 1;
    visibility: visible;
  }

  /* Responsive: show hamburger, hide desktop nav on mobile */
  @media (max-width: 640px) {
    .site-nav--desktop {
      display: none;
    }

    .mobile-menu-open {
      display: block;
    }
  }
}