/*
  懸浮的 AI 聊天助理 icon：固定在畫面右下角，疊在版號標籤（.version-badge）正上方、不重疊。
  目前只是版面預留，按下去沒有作用（尚未接上真正的聊天功能）。
*/
.chatbot-fab {
  position: fixed;
  right: var(--space-4, 16px);
  bottom: 68px;
  z-index: 998;
  width: 56px;
  height: 56px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  background: none;
  box-shadow: 0 8px 24px rgba(16, 24, 28, .22);
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
}
.chatbot-fab svg { width: 100%; height: 100%; display: block; }
.chatbot-fab:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(16, 24, 28, .28); }
.chatbot-fab:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }
/* No function yet (.is-placeholder, shared/app-shell.css) — drop the hover lift too, so it doesn't
   invite a click that does nothing. */
.chatbot-fab.is-placeholder:hover { transform: none; box-shadow: 0 8px 24px rgba(16, 24, 28, .22); }

@media (max-width: 480px) {
  .chatbot-fab { right: var(--space-3, 12px); bottom: 60px; width: 48px; height: 48px; }
}