/* ============================================================
   Storey Consulting — global collapsible site header
   Centered hexagon mark + split nav. Sticky. Collapses on scroll.
   Inject markup via site-header.js or write it inline.
   ============================================================ */

:root {
  --header-h: 72px;
  --header-transition: 200ms ease-out;
}

@media (prefers-reduced-motion: reduce) {
  :root { --header-transition: 0.01ms; }
  .site-header, .site-header * { transition: none !important; }
}

/* Fixed-height sticky header. Never resizes on scroll, so no reflow,
   no oscillation, no flicker. Background subtly intensifies on scroll. */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  background: var(--white);
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background var(--header-transition), border-color var(--header-transition), box-shadow var(--header-transition);
}

.site-header.is-collapsed {
  background: rgba(255, 255, 255, 0.96);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom-color: var(--hairline);
  box-shadow: 0 1px 0 rgba(11, 37, 69, 0.04);
}

.site-header__inner {
  max-width: 1440px;
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter, 32px);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
}

/* ---- Logo (left) ---- */
.site-header__logo {
  grid-column: 1;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  gap: 6px;
  text-decoration: none;
  color: var(--navy);
}
.site-header__logo-mark {
  display: block;
  width: 80px; height: 80px;
  object-fit: contain;
  flex-shrink: 0;
  margin: -8px 0;
}

/* ---- Left nav ---- */
.site-header__nav {
  grid-column: 2;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: nowrap;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--sans, 'Public Sans', sans-serif);
  font-size: 13.5px;
  white-space: nowrap;
}
.site-header__nav a {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  color: var(--navy);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
.site-header__nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1.5px;
  background: var(--mint);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.site-header__nav a:hover { color: var(--mint-strong); }
.site-header__nav a:hover::after { transform: scaleX(1); }
.site-header__nav a.is-current { color: var(--mint-strong); }
.site-header__nav a.is-current::after { transform: scaleX(1); background: var(--mint-strong); }
.site-header__nav a:focus-visible { outline: 2px solid var(--mint); outline-offset: 4px; border-radius: 2px; }

/* No size change on scroll, just background. Eliminates reflow oscillation. */

/* ---- Right CTA ---- */
.site-header__cta-wrap {
  grid-column: 3;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}
.site-header__cta {
  display: inline-block;
  background: var(--navy);
  color: var(--white);
  padding: 12px 24px;
  font-family: var(--sans, 'Public Sans', sans-serif);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: background 0.2s, padding var(--header-transition), font-size var(--header-transition);
  text-decoration: none;
}
.site-header__cta:hover { background: #163864; }
.site-header__cta:focus-visible { outline: 2px solid var(--mint); outline-offset: 3px; }
/* CTA stays the same size on scroll. */

/* ---- Mobile burger ---- */
.site-header__burger {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--hairline);
  background: var(--white);
  border-radius: 4px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.site-header__burger-icon {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--navy);
  position: relative;
  transition: background 0.2s;
}
.site-header__burger-icon::before,
.site-header__burger-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--navy);
  transition: transform 0.25s ease, top 0.25s ease;
}
.site-header__burger-icon::before { top: -6px; }
.site-header__burger-icon::after  { top: 6px; }
.site-header.is-menu-open .site-header__burger-icon { background: transparent; }
.site-header.is-menu-open .site-header__burger-icon::before { top: 0; transform: rotate(45deg); }
.site-header.is-menu-open .site-header__burger-icon::after  { top: 0; transform: rotate(-45deg); }

/* ---- Mobile drawer ---- */
.site-header__drawer {
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0;
  background: var(--white);
  border-top: 1px solid var(--hairline);
  padding: 24px var(--gutter, 32px) 40px;
  transform: translateY(-110%);
  transition: transform var(--header-transition);
  box-shadow: 0 12px 24px rgba(11, 37, 69, 0.08);
  display: none;
  z-index: 40;
}
.site-header.is-menu-open .site-header__drawer { transform: translateY(0); }
.site-header__drawer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.site-header__drawer a {
  display: block;
  padding: 14px 0;
  font-family: var(--serif, 'EB Garamond', serif);
  font-size: 22px;
  color: var(--navy);
  border-bottom: 1px solid var(--hairline);
  text-decoration: none;
}
.site-header__drawer .site-header__cta {
  display: inline-block;
  margin-top: 24px;
}

/* ---- Responsive: below 900px the splash mode is suppressed ---- */
@media (max-width: 900px) {
  .site-header__nav,
  .site-header__cta-wrap { display: none; }
  .site-header__burger { display: inline-flex; }
  .site-header__drawer { display: block; }
  .site-header__inner { grid-template-columns: 1fr auto; padding: 0 20px; }
  .site-header__logo { grid-column: 1; justify-self: start; }
  .site-header__logo-mark { width: 56px; height: 56px; margin: -4px 0; }
  .site-header__burger { grid-column: 2; justify-self: end; }
}