.system-error-notice {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 16px;
  width: min(540px, calc(100vw - 40px));
  box-sizing: border-box;
  padding: 16px 18px;
  border: 1px solid #c8b7ab;
  border-radius: 14px;
  background: #f7f5f1;
  color: #1d2830;
  box-shadow: 0 8px 28px #1d283020;
  font: 14px/1.5 system-ui, sans-serif;
}

.system-error-notice[hidden] { display: none; }
.system-error-notice p { flex: 1; margin: 0; overflow-wrap: anywhere; }
.system-error-notice button {
  flex-shrink: 0;
  margin: 0;
  padding: 8px 10px;
  border: 1px solid #c8b7ab;
  border-radius: 8px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
}
.system-error-notice button:focus-visible { outline: 2px solid #a85732; outline-offset: 3px; }

@media (max-width: 480px) {
  .system-error-notice { right: 12px; bottom: 12px; width: calc(100vw - 24px); gap: 10px; }
}