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

  .site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    width: 100%;
    max-width: var(--container-main-max);
    margin-inline: auto;
    padding-inline: var(--container-padding-mobile);
    min-height: 72px;
  }

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

  .site-header__brand:hover {
    text-decoration: none;
  }

  .site-header__logo {
    width: 64px;
    height: 64px;
    object-fit: contain;
    display: block;
  }

  .site-header__brand-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: 0;
    color: var(--color-blueprint-blue);
    white-space: nowrap;
  }

  .site-header__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--color-blueprint-blue);
    border-radius: var(--radius-button);
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
  }

  .site-header__toggle:hover {
    background-color: var(--color-soft-concrete);
  }

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

  .site-header__toggle-line {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--color-blueprint-blue);
    border-radius: 0;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

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

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

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

  .site-header__item {
    margin: 0;
    padding: 0;
  }

  .site-header__item + .site-header__item {
    margin: 0;
  }

  .site-header__link {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--color-deep-navy);
    text-decoration: none;
    padding-block: var(--space-xs);
    position: relative;
    transition: color var(--transition-fast);
    white-space: nowrap;
  }

  .site-header__link::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background-color: var(--color-blueprint-blue);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-fast);
  }

  .site-header__link:hover {
    color: var(--color-blueprint-blue);
    text-decoration: none;
  }

  .site-header__link:hover::after {
    transform: scaleX(1);
  }

  .site-header__link:focus-visible {
    outline: 2px solid var(--color-blueprint-blue);
    outline-offset: 2px;
  }

  .site-header__cta {
    flex-shrink: 0;
    white-space: nowrap;
  }

  @media (max-width: 1023px) {
    .site-header__inner {
      flex-wrap: wrap;
      min-height: 64px;
    }

    .site-header__logo {
      width: 40px;
      height: 40px;
    }

    .site-header__brand-text {
      font-size: 1rem;
    }

    .site-header__toggle {
      display: flex;
    }

    .site-header__nav {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background-color: var(--color-architectural-white);
      border-bottom: 1px solid var(--color-concrete-grey);
      box-shadow: var(--shadow-subtle);
      padding: var(--space-md) var(--container-padding-mobile);
      max-height: calc(100vh - 100px);
      overflow-y: auto;
      z-index: 999;
    }

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

    .site-header__list {
      flex-direction: column;
      align-items: stretch;
      gap: var(--space-sm);
      width: 100%;
    }

    .site-header__item {
      width: 100%;
    }

    .site-header__link {
      display: block;
      width: 100%;
      padding: var(--space-sm) var(--space-md);
      border: 1px solid transparent;
      border-radius: var(--radius-button);
      text-align: left;
    }

    .site-header__link::after {
      display: none;
    }

    .site-header__link:hover {
      background-color: var(--color-soft-concrete);
      color: var(--color-blueprint-blue);
    }

    .site-header__cta {
      margin-left: auto;
    }
  }

  @media (max-width: 767px) {
    .site-header__inner {
      gap: var(--space-sm);
    }

    .site-header__brand-text {
      display: none;
    }

    .site-header__cta {
      font-size: 0.75rem;
      padding: var(--space-xs) var(--space-sm);
    }
  }
}