.site-header {
  background: var(--color-dark-green);
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header-inner {
  /* 1320px is the intended rendered content width. Padding is included in
     the box (border-box, set globally), so max-width is widened by the
     horizontal padding to compensate — otherwise the rendered content area
     would be 1320px minus padding (1272px), not the intended 1320px. */
  max-width: calc(1320px + (var(--space-4) * 2));
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-logo {
  display: block;
  line-height: 0;
  flex-shrink: 0;
}

.site-logo img {
  display: block;
  height: 44px;
  width: auto;
}

.primary-nav {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: flex-end;
  gap: var(--space-3);
  min-width: 0;
}

/* Mobile toggle: solid Light Green fill, Ink foreground (~7.8:1 contrast). */
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-light-green);
  border: none;
  color: var(--color-ink);
  border-radius: 6px;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--step-body);
  font-weight: 600;
  cursor: pointer;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  background: var(--color-paper);
}

.primary-nav-panel {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: nowrap;
  min-width: 0;
}

.primary-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Nav typography: Title Case as authored, semibold, modest letter-spacing —
   not full uppercase (the approved labels are long). Text stays white in
   every state; Light Green appears only as a non-text underline indicator. */
.primary-nav-item > a {
  display: inline-block;
  color: var(--color-white);
  text-decoration: none;
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  padding-bottom: 4px;
}

.primary-nav-item > a:hover,
.primary-nav-item > a:focus-visible {
  border-bottom-color: var(--color-light-green);
}

.primary-nav-item > a[aria-current="page"] {
  border-bottom-color: var(--color-light-green);
}

.nav-disclosure summary {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-white);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  padding-bottom: 4px;
}

.nav-disclosure summary:hover,
.nav-disclosure summary:focus-visible {
  border-bottom-color: var(--color-light-green);
}

.nav-disclosure summary::-webkit-details-marker {
  display: none;
}

.has-submenu.is-current-section > .nav-disclosure summary {
  border-bottom-color: var(--color-light-green);
}

/* Designed submenu panel: Paper surface, generous padding, a noninteractive
   eyebrow label, and divided link rows — a composed panel, not a bordered
   browser dropdown. */
.nav-submenu-panel {
  background: var(--color-paper);
  border-radius: 10px;
  padding: var(--space-4);
  box-shadow: 0 12px 28px rgba(18, 35, 28, 0.28);
  min-width: 280px;
}

.nav-submenu-eyebrow {
  margin: 0 0 var(--space-2);
  font-size: var(--step-small);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-medium-green);
  pointer-events: none;
}

.nav-submenu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.nav-submenu li {
  border-top: 1px solid rgba(32, 86, 65, 0.15);
}

.nav-submenu li:first-child {
  border-top: none;
}

.nav-submenu a {
  display: block;
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 600;
  padding: var(--space-2) var(--space-1);
}

.nav-submenu a:hover,
.nav-submenu a:focus-visible {
  color: var(--color-dark-green);
}

.nav-submenu a[aria-current="page"] {
  color: var(--color-dark-green);
  text-decoration: underline;
}

/* Header CTA: Terracotta fill, white text (~4.94:1, clears normal-text AA).
   Hover swaps to Ink (also white text) — a deliberate hard color-cut,
   not a lighten/darken filter. */
.header-cta {
  display: inline-block;
  background: var(--color-terracotta);
  color: var(--color-white);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: 6px;
  font-family: var(--font-body);
  font-weight: 700;
  white-space: nowrap;
  text-align: center;
}

.header-cta:hover,
.header-cta:focus-visible {
  background: var(--color-ink);
  color: var(--color-white);
}

@media (max-width: 859px) {
  .site-header-inner {
    flex-wrap: nowrap;
  }

  html.js .nav-toggle {
    display: inline-flex;
  }

  /* Full designed mobile navigation surface: Paper panel, divided rows,
     larger tap targets, full-width CTA anchoring the bottom. */
  html.js .primary-nav-panel {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-paper);
    padding: var(--space-4);
    z-index: 50;
    gap: var(--space-4);
    border-top: 3px solid var(--color-light-green);
    box-shadow: 0 16px 32px rgba(18, 35, 28, 0.25);
  }

  html.js .primary-nav-panel.is-open {
    display: flex;
  }

  html.js .primary-nav-panel .primary-nav-list {
    gap: 0;
  }

  html.js .primary-nav-panel .primary-nav-item {
    border-bottom: 1px solid rgba(32, 86, 65, 0.15);
  }

  html.js .primary-nav-panel .primary-nav-item > a,
  html.js .primary-nav-panel .nav-disclosure summary {
    display: flex;
    color: var(--color-ink);
    border-bottom-color: transparent;
    padding: var(--space-3) 0;
  }

  html.js .primary-nav-panel .primary-nav-item > a:hover,
  html.js .primary-nav-panel .primary-nav-item > a:focus-visible,
  html.js .primary-nav-panel .nav-disclosure summary:hover,
  html.js .primary-nav-panel .nav-disclosure summary:focus-visible {
    color: var(--color-dark-green);
  }

  html.js .primary-nav-panel .primary-nav-item > a[aria-current="page"],
  html.js .primary-nav-panel .has-submenu.is-current-section > .nav-disclosure summary {
    color: var(--color-dark-green);
  }

  html.js .primary-nav-panel .nav-submenu-panel {
    box-shadow: none;
    padding: var(--space-2) 0 var(--space-2) var(--space-3);
  }

  html.js .primary-nav-panel .header-cta {
    display: block;
    width: 100%;
    text-align: center;
    margin-top: var(--space-2);
  }
}

@media (min-width: 860px) {
  .primary-nav-list {
    flex-direction: row;
    align-items: center;
  }

  .nav-disclosure {
    position: relative;
  }

  .nav-submenu-panel {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: var(--space-2);
  }

  .nav-disclosure:hover > .nav-submenu-panel,
  .nav-disclosure:focus-within > .nav-submenu-panel,
  .nav-disclosure[open] > .nav-submenu-panel {
    display: block;
  }

  /* Tighter intermediate tier, sized against the approved labels (notably
     "Fractional Engineering Leadership") so nothing wraps to a second row
     through the ~860-1199px range. */
  .primary-nav-list {
    gap: var(--space-2);
  }

  .primary-nav-item > a,
  .nav-disclosure summary {
    font-size: var(--step-small);
    letter-spacing: 0;
  }

  .header-cta {
    padding: var(--space-2) var(--space-3);
    font-size: var(--step-small);
  }
}

@media (min-width: 1200px) {
  .primary-nav-list {
    gap: var(--space-4);
  }

  .primary-nav-item > a,
  .nav-disclosure summary {
    font-size: var(--step-body);
    letter-spacing: 0.01em;
  }

  .header-cta {
    padding: var(--space-2) var(--space-4);
    font-size: var(--step-body);
  }
}