@layer layout {
  .site-header {
    position: sticky;
    top: calc(var(--utility-height) * -1);
    z-index: var(--z-header);
  }

  .utility-bar {
    display: none;
    height: var(--utility-height);
    background: var(--surface-page);
    border-bottom: 1px solid var(--line-faint);
    color: var(--ink-on-dark-soft);
    font-size: var(--text-2xs);
    letter-spacing: 0.02em;
  }

  .utility-bar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-l);
    height: 100%;
  }

  .utility-bar__license {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
  }

  .utility-bar__star {
    width: 0.875rem;
    height: 0.875rem;
    fill: none;
    stroke: var(--color-stamen);
    stroke-width: 1.3;
  }

  .utility-bar__links {
    display: flex;
    align-items: center;
    gap: var(--space-l);
  }

  .utility-bar__link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-height: var(--utility-height);
    color: var(--ink-on-dark);
    transition: color var(--duration-base) ease;
  }

  .utility-bar__link .icon {
    width: 0.9375rem;
    height: 0.9375rem;
    color: var(--color-stamen);
  }

  .utility-bar :focus-visible {
    outline-color: var(--focus-ring-on-dark);
    outline-offset: -2px;
  }

  .site-header__bar {
    position: relative;
    height: var(--header-height);
    background: var(--surface-page);
    border-bottom: 1px solid var(--line-faint);
    transition: background-color var(--duration-slow) ease, border-color var(--duration-slow) ease;
  }

  .site-header.is-scrolled .site-header__bar,
  .site-header.is-panel-open .site-header__bar {
    background: var(--surface-frosted);
    border-bottom-color: var(--line);
    -webkit-backdrop-filter: saturate(1.4) blur(14px);
    backdrop-filter: saturate(1.4) blur(14px);
  }

  .site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-m);
    height: 100%;
  }

  .brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    flex: none;
    min-height: 2.75rem;
    color: var(--ink);
  }

  .brand__mark {
    height: 2.625rem;
    transition: transform var(--duration-slow) var(--ease-out-expo);
  }

  .brand__text {
    display: grid;
    gap: 0.25rem;
  }

  .brand__role {
    font-size: 0.625rem;
    font-weight: var(--weight-strong);
    line-height: 1;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--ink-soft);
  }

  .brand__name {
    font-family: var(--font-display);
    font-size: 1.3125rem;
    font-weight: var(--weight-heading);
    line-height: 1;
    letter-spacing: -0.01em;
    white-space: nowrap;
  }

  .primary-nav {
    display: none;
  }

  .primary-nav__list {
    display: flex;
    align-items: center;
    gap: clamp(1.1rem, 0.1rem + 1.4vw, 2.1rem);
  }

  .primary-nav__item {
    position: relative;
    display: flex;
    align-items: center;
  }

  .primary-nav__item--panel {
    position: static;
  }

  .primary-nav__link {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 2.75rem;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    letter-spacing: 0.01em;
    color: var(--ink);
    white-space: nowrap;
  }

  .primary-nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0.55rem;
    height: 1px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: right center;
    transition: transform var(--duration-slow) var(--ease-out-expo);
  }

  .primary-nav__link[aria-current="page"]::after {
    transform: scaleX(1);
  }

  .primary-nav__toggle {
    display: inline-grid;
    place-items: center;
    width: 1.75rem;
    height: 2.75rem;
    margin-right: -0.5rem;
    color: var(--ink-soft);
  }

  .primary-nav__toggle .icon {
    width: 1rem;
    height: 1rem;
    transition: transform var(--duration-slow) var(--ease-out-expo);
  }

  .primary-nav__toggle:focus-visible {
    outline-offset: -2px;
  }

  .primary-nav__toggle[aria-expanded="true"] {
    color: var(--ink-accent);
  }

  .primary-nav__toggle[aria-expanded="true"] .icon {
    transform: rotate(180deg);
  }

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

  .site-header__cta {
    min-height: 2.5rem;
    padding: 0 1rem;
    font-size: var(--text-sm);
  }

  .site-header__cta-rest {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    min-height: 2.75rem;
    padding: 0 0.25rem 0 0.625rem;
    font-size: var(--text-sm);
    font-weight: var(--weight-strong);
    letter-spacing: 0.02em;
    border-radius: var(--radius-pill);
  }

  .menu-toggle__lines {
    position: relative;
    width: 1.5rem;
    height: 0.5rem;
  }

  .menu-toggle__lines::before,
  .menu-toggle__lines::after {
    content: "";
    position: absolute;
    right: 0;
    height: 1.5px;
    background: currentColor;
    border-radius: 1px;
    transition: width var(--duration-slow) var(--ease-out-expo);
  }

  .menu-toggle__lines::before {
    top: 0;
    width: 100%;
  }

  .menu-toggle__lines::after {
    bottom: 0;
    width: 62%;
  }

  .mega-panel {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: var(--z-panel);
    max-block-size: calc(100svh - var(--header-height) - var(--utility-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--surface-page);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-panel);
  }

  .mega-panel__inner {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 2.1fr);
    gap: var(--space-2xl);
    padding-block: var(--space-xl);
  }

  .mega-panel__intro {
    display: grid;
    align-content: start;
    gap: var(--space-s);
    padding-right: var(--space-l);
    border-right: 1px solid var(--line);
  }

  .mega-panel__eyebrow {
    font-size: var(--text-2xs);
    font-weight: var(--weight-strong);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--ink-soft);
  }

  .mega-panel__title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-style: italic;
    font-weight: var(--weight-display);
    line-height: 1.2;
    color: var(--ink-accent);
  }

  .mega-panel__text {
    font-size: var(--text-ui);
    color: var(--ink-soft);
  }

  .mega-panel__groups {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-l) var(--grid-gap);
  }

  .mega-panel__group-link {
    display: grid;
    gap: 0.5rem;
    padding-top: var(--space-s);
    border-top: 1px solid var(--line-strong);
  }

  .mega-panel__group-title {
    font-family: var(--font-display);
    font-size: 1.1875rem;
    font-weight: var(--weight-heading);
    line-height: 1.2;
    transition: color var(--duration-base) ease;
  }

  .mega-panel__group-areas {
    font-size: var(--text-xs);
    line-height: 1.55;
    color: var(--ink-soft);
  }

  .site-header.is-panel-open .mega-panel {
    animation: mega-panel-in 0.5s var(--ease-out-expo) both;
  }

  .site-header.is-panel-closing .mega-panel {
    pointer-events: none;
    animation: mega-panel-out 0.32s var(--ease-in-out) both;
  }

  @media (hover: hover) {
    .brand:hover .brand__mark {
      transform: rotate(-8deg);
    }

    .utility-bar__link:hover {
      color: var(--color-pollen);
    }

    .primary-nav__link:hover::after {
      transform: scaleX(1);
      transform-origin: left center;
    }

    .primary-nav__toggle:hover {
      color: var(--ink-accent);
    }

    .menu-toggle:hover .menu-toggle__lines::after {
      width: 100%;
    }

    .mega-panel__group-link:hover .mega-panel__group-title {
      color: var(--ink-accent);
    }
  }

  @media (max-width: 24.3em) {
    .site-header__cta {
      display: none;
    }
  }

  @media (max-width: 29.99em) {
    .site-header__inner {
      gap: var(--space-s);
    }

    .brand {
      gap: 0.625rem;
    }

    .brand__name {
      font-size: 1.1875rem;
    }

    .brand__role {
      font-size: 0.5625rem;
    }

    .site-header__cta {
      padding: 0 0.875rem;
    }

    .menu-toggle {
      padding: 0 0.5rem;
    }

    .menu-toggle__label {
      position: absolute;
      width: 1px;
      height: 1px;
      overflow: hidden;
      clip: rect(0 0 0 0);
      white-space: nowrap;
    }
  }

  @media (min-width: 48em) {
    .site-header__cta {
      min-height: 2.75rem;
      padding: 0 1.25rem;
    }

    .site-header__cta-rest {
      position: static;
      width: auto;
      height: auto;
      overflow: visible;
      clip: auto;
    }

    .brand__name {
      font-size: 1.4375rem;
    }

    .brand__mark {
      height: 3rem;
    }
  }

  @media (min-width: 64em) {
    .utility-bar {
      display: block;
    }
  }

  @media (min-width: 81.25em) {
    .primary-nav {
      display: block;
    }

    .menu-toggle {
      display: none;
    }

    .site-header__cta {
      min-height: 2.875rem;
      padding: 0 1.5rem;
    }
  }

  @keyframes mega-panel-in {
    from {
      opacity: 0;
      transform: translateY(-0.5rem);
    }

    to {
      opacity: 1;
      transform: none;
    }
  }

  @keyframes mega-panel-out {
    from {
      opacity: 1;
      transform: none;
    }

    to {
      opacity: 0;
      transform: translateY(-0.5rem);
    }
  }
}