.data-backend-warning {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  margin: 0;
  border-top: 1px solid #8a5300;
  border-bottom: 1px solid #8a5300;
  background: #3b2500;
  color: #ffd79a;
  font-size: 13px;
  line-height: 1.4;
  position: sticky;
  top: 56px;
  z-index: 1200;
}

/* hidden属性を確実に優先（✕で消えない問題の根本修正） */
.data-backend-warning[hidden] {
  display: none !important;
}

body[data-theme="light"] .data-backend-warning {
  background: #fff4df;
  border-top-color: #cc8a2a;
  border-bottom-color: #cc8a2a;
  color: #7f4a00;
}

.data-backend-warning .material-symbols-outlined {
  font-size: 18px;
}

.data-backend-warning__close {
  margin-left: auto;
  border: 1px solid rgba(255,255,255,0.35);
  background: transparent;
  color: inherit;
  border-radius: 6px;
  font-size: 12px;
  line-height: 1;
  padding: 4px 6px;
}