.siwei-app-loading {
  position: fixed; bottom: max(24px, env(safe-area-inset-bottom)); left: 50%; transform: translateX(-50%);
  z-index: 99999; max-width: calc(100vw - 40px); padding: 10px 16px; border: 1px solid var(--color-border);
  border-radius: var(--radius-md, 16px); background: var(--color-background); color: var(--color-typography);
  font: 14px/1.6 var(--font-body, sans-serif); box-shadow: 0 4px 20px #0000000a;
}
.siwei-app-loading[hidden] { display: none; }