/* NEXUS — 致命错误层：启动或路由失败时的兜底界面 (A7) */

.fatal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--scrim-strong);
  backdrop-filter: none;
}
.fatal[hidden] { display: none; }

.fatal__panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: min(460px, 100%);
  padding: 26px 26px 22px;
  border: 1px solid var(--color-panel-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-panel-strong);
  box-shadow: var(--shadow-float);
}

.fatal__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: var(--tracking-label);
  color: var(--color-text-faint);
}

.fatal__title {
  font-size: var(--text-h2);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  line-height: 1.4;
}

.fatal__text {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-danger);
  word-break: break-word;
}

.fatal__hint {
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-text-mute);
}

.fatal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

/* 数据库被其他标签页阻塞时的常驻提示（A8）：不挡操作，只解释与给出口 */
.notice {
  position: fixed;
  z-index: 118;
  top: clamp(12px, 2vw, 22px);
  left: 50%;
  display: flex;
  align-items: center;
  gap: 16px;
  width: min(620px, calc(100% - 32px));
  padding: 14px 18px;
  border: 1px solid var(--color-ice-line);
  border-radius: var(--radius-md);
  background: var(--color-panel-strong);
  box-shadow: var(--shadow-float);
  opacity: 0;
  transform: translate(-50%, -10px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
}
.notice.is-shown { opacity: 1; transform: translate(-50%, 0); }

.notice__body { display: flex; flex-direction: column; gap: 3px; min-width: 0; }

.notice__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-ice-strong);
}

.notice__text {
  font-size: var(--text-xs);
  line-height: 1.65;
  color: var(--color-text-mute);
}

.notice__action { flex: none; }

@media (max-width: 640px) {
  .notice { flex-direction: column; align-items: flex-start; gap: 10px; }
  .notice__action { width: 100%; }
}