.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  transition: background .25s ease, box-shadow .25s ease;
}
.site-header.scrolled { background: rgba(255,255,255,.95); backdrop-filter: blur(10px); box-shadow: var(--shadow); }
.header-inner { min-height: 78px; display: flex; align-items: center; gap: var(--space-3); }
.logo { font-size: 1.15rem; font-weight: 800; }
.nav { margin-left: auto; display: none; gap: var(--space-3); }
.nav a { font-weight: 600; color: #2d3748; }
.header-cta { display: none; }
.burger {
  margin-left: auto; width: 44px; height: 44px;
  display: grid; place-content: center; gap: 5px;
  background: transparent; border: 0;
}
.burger span { width: 22px; height: 2px; background: #2d3748; display: block; }
.mobile-menu {
  display: grid;
  gap: var(--space-2);
  background: #fff;
  padding: 0 var(--space-2);
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease, padding .25s ease;
}
.mobile-menu.open { max-height: 340px; padding-bottom: var(--space-2); }
@media (min-width: 900px) {
  .burger, .mobile-menu { display: none; }
  .nav, .header-cta { display: inline-flex; }
}