.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--color-line); }

.site-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-block: 12px;
}
.site-header__logo img { height: 56px; width: auto; }

.site-nav { display: flex; gap: 32px; }
.site-nav a {
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  padding-block: 12px;
}
.site-nav a:hover { color: var(--color-muted); }

@media (max-width: 760px) {
  .site-nav { gap: 18px; }
  .site-nav a { font-size: var(--text-xs); letter-spacing: 0.14em; }
  .site-header__logo img { height: 44px; }
}