.hud {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(10, 13, 22, 0.72);
  border-bottom: 1px solid var(--border-line);
  opacity: 0;
  transform: translateY(-12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.hud.is-visible { opacity: 1; transform: translateY(0); }

.hud-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.hud-mark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--text-primary);
}
.hud-mark-dot { color: var(--accent-gold); }

.hud-nav {
  position: relative;
  display: flex;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.hud-nav a {
  color: var(--text-secondary);
  transition: color 0.15s ease;
  position: relative;
  padding-bottom: 4px;
}
.hud-nav a:hover { color: var(--text-primary); }
.hud-nav a[aria-current="true"] { color: var(--text-primary); }

.hud-indicator {
  position: absolute;
  bottom: -1px;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
  width: 0;
  left: 0;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), width 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s ease;
  opacity: 0;
  box-shadow: 0 0 8px var(--accent-cyan);
}
.hud-indicator.is-active { opacity: 1; }

.hud-cta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  border: 1px solid var(--border-line-strong);
  padding: 8px 16px;
  border-radius: 999px;
  color: var(--text-primary);
  white-space: nowrap;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.hud-cta:hover {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
}

@media (max-width: 720px) {
  .hud-nav { display: none; }
}