.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  z-index: 500;
  transition: background 0.5s var(--ease-expo), border-color 0.5s var(--ease-expo);
  border-bottom: 1px solid transparent;
}

/* Scrolled state */
.header--scrolled {
  background: rgba(10, 10, 10, 0.82);
  backdrop-filter: blur(22px) saturate(1.2);
  -webkit-backdrop-filter: blur(22px) saturate(1.2);
  border-bottom-color: var(--c-border-soft);
}

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

.header__wordmark {
  font-family: var(--f-display);
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-text);
  user-select: none;
  transition: opacity var(--t-fast);
}
.header__wordmark:hover { opacity: 0.7; }