.demo-header {
  min-height: 72px;
  padding: 12px clamp(16px, 3vw, 36px);
  background: linear-gradient(120deg, #7f1d1d, #dc2626);
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--wms-font-body, "Noto Sans Thai", sans-serif);
  box-shadow: 0 3px 14px rgba(127, 29, 29, .24);
}
.demo-brand { display: flex; align-items: center; gap: 12px; }
.demo-brand strong { display: block; font-size: 1.15rem; line-height: 1.25; }
.demo-brand small { display: block; opacity: .82; margin-top: 2px; }
.demo-icon { font-size: 1.7rem; }
.demo-actions { display: flex; align-items: center; gap: 10px; }
.demo-actions button { border: 1px solid rgba(255,255,255,.55); background: rgba(255,255,255,.12); color: white; padding: 7px 11px; border-radius: 7px; cursor: pointer; font: 600 12px var(--wms-font-body, sans-serif); }
.demo-actions button:hover { background: rgba(255,255,255,.22); }
@media (max-width: 640px) {
  .demo-header { align-items: flex-start; }
  .demo-brand small { display: none; }
  .demo-actions { flex-direction: column; align-items: flex-end; }
  .demo-actions button { padding: 5px 8px; font-size: 11px; }
}