.site-header{position:sticky;top:0;z-index:40}.site-header .nav-brand-text{letter-spacing:0.18em;text-transform:uppercase;font-size:0.82rem}.site-header .nav-menu{align-items:center;gap:1.5rem}.site-header .nav-item{position:relative}.site-header .nav-link{font-size:0.9rem;font-weight:500;color:var(--color-text)}.site-header .nav-link:focus-visible{outline:2px solid var(--color-primary);outline-offset:4px}.nav-primary{display:flex;align-items:center}@media (max-width:768px){.site-header .nav-primary{position:fixed;inset:var(--nav-height) 0 auto 0;max-height:calc(100vh - var(--nav-height));background:rgba(253,251,247,0.98);backdrop-filter:blur(16px);border-bottom:1px solid rgba(226,232,240,0.95);transform:translateY(-110%);opacity:0;visibility:hidden;transition:transform var(--transition-base),opacity var(--transition-base),visibility var(--transition-base)}.site-header .nav-menu{flex-direction:column;align-items:flex-start;padding:1.4rem 1.5rem 1.75rem}.site-header .nav-item{width:100%}.site-header .nav-link{display:block;width:100%;padding-block:0.55rem}.site-header .nav-primary.is-open{transform:translateY(0);opacity:1;visibility:visible}.site-header .nav-cta{gap:0.5rem}.site-header .nav-cta .btn{padding-inline:1.2rem}}@media (max-width:480px){.site-header .nav-inner{gap:0.75rem}.site-header .nav-brand-text{display:none}.site-header .nav-cta .badge-nav{display:none}.site-header .nav-cta .btn{padding-inline:1rem;font-size:0.72rem}}.nav-toggle.is-active .nav-toggle-bar:first-child{transform:translateY(2px) rotate(42deg);transition:transform var(--transition-base)}.nav-toggle.is-active .nav-toggle-bar:last-child{transform:translateY(-2px) rotate(-42deg);transition:transform var(--transition-base)}.nav-toggle-bar{transition:transform var(--transition-base)}

/* checklist: hamburger X */
.nav-toggle {
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 999px;
  background: #111827;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 768px) {
  .site-header .nav-primary {
    background: var(--color-bg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    overflow-y: auto;
    overscroll-behavior: contain;
    box-shadow: 0 24px 48px rgba(15, 23, 42, 0.18);
  }
  .site-header .nav-menu {
    display: flex;
    width: 100%;
    gap: 0;
  }
  .site-header .nav-link {
    display: flex;
    align-items: center;
    min-height: 44px;
  }
  .site-header .nav-brand {
    margin-right: auto;
  }
  .site-header .nav-cta {
    order: 1;
  }
  .site-header .nav-toggle {
    order: 2;
  }
  .site-header .nav-inner {
    gap: 0.75rem;
  }
}