.header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: background var(--transition), box-shadow var(--transition);
}

.header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__link {
  position: relative;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 0;
  transition: color var(--transition);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--primary-600);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--primary-600);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  transform: scaleX(1);
}

.nav__cta-mobile {
  display: none;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
}

.nav__toggle span {
  width: 24px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--text-dark);
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }