/* =====================================================================
   ADROAS — css/header.css
   Site header, nav, wordmark, hamburger toggle.
   ===================================================================== */


/* ─────────────────────────────────────────────────────────────────────
   4. HEADER — floats over hero, transparent
   ───────────────────────────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  background: rgba(247, 245, 240, 0.84);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 var(--pad-x);
  max-width: 1440px;
  margin: 0 auto;
  gap: 2.5rem;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.10em;
  line-height: 1; /* must match intro-lockup line-height so text flex-item height aligns on FLIP swap */
  text-transform: uppercase;
  color: var(--navy);
  text-decoration: none;
  flex-shrink: 0;
}
.wordmark:hover { color: var(--blue); }

/* AD symbol in the header lockup — transparent navy PNG, no filter */
.brand-symbol {
  display: block;
  height: 32px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  margin-left: auto;
}
.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--navy);
  text-decoration: none;
  opacity: 0.68;
  white-space: nowrap;
  transition: opacity 0.15s;
}
.nav-link:hover { opacity: 1; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
  margin-left: 1.75rem;
}

.btn--hdr-ghost {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.1rem;
  border: 1px solid rgba(24, 38, 58, 0.16);
  border-radius: 8px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--navy);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.52);
  backdrop-filter: blur(6px);
  white-space: nowrap;
  transition: border-color 0.16s, background 0.16s;
}
.btn--hdr-ghost:hover { border-color: var(--steel); background: rgba(255,255,255,0.80); }

.btn--hdr-dark {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.15rem;
  background: var(--navy);
  border: 1px solid var(--navy);
  border-radius: 8px;
  font-size: 0.84rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.16s, border-color 0.16s;
}
.btn--hdr-dark:hover { background: var(--blue); border-color: var(--blue); }

/* Desktop defaults: hide mobile elements */
.mobile-nav-actions {
  display: none !important;
}
.mobile-only-cta {
  display: none !important;
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  margin-left: auto;
}
.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--navy);
  border-radius: 2px;
  transition: opacity 0.2s, transform 0.22s cubic-bezier(0.4,0,0.2,1);
}
.site-header.nav-is-open .nav-toggle__bar:nth-child(1) { transform: translateY(8.25px) rotate(45deg); }
.site-header.nav-is-open .nav-toggle__bar:nth-child(2) { opacity: 0; transform: scaleX(0); }
.site-header.nav-is-open .nav-toggle__bar:nth-child(3) { transform: translateY(-8.25px) rotate(-45deg); }