/* ===== PWA 悬浮按钮 — 苹果 AssistiveTouch 小白点样式 ===== */
#pwa-fab {
  position: fixed;
  right: 20px;
  bottom: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  backdrop-filter: blur(14px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.75);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  z-index: 2147483640;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.15s ease;
}
#pwa-fab:active {
  cursor: grabbing;
  transform: scale(0.94);
}
#pwa-fab svg {
  width: 26px;
  height: 26px;
  display: block;
  pointer-events: none;
}
#pwa-fab-panel {
  position: fixed;
  right: 20px;
  bottom: 92px;
  width: 290px;
  max-width: calc(100vw - 40px);
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
  padding: 16px;
  z-index: 2147483641;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  color: #1a1a1a;
  display: none;
  box-sizing: border-box;
}
#pwa-fab-panel.show {
  display: block;
}
#pwa-fab-panel h4 {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
}
#pwa-fab-panel p {
  margin: 0 0 8px;
  font-size: 13px;
  line-height: 1.6;
  color: #444;
}
#pwa-fab-panel ol {
  margin: 6px 0 0;
  padding-left: 18px;
}
#pwa-fab-panel li {
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 6px;
  color: #333;
}
#pwa-fab-panel .pwa-hint {
  font-size: 12px;
  color: #888;
  margin-top: 8px;
}
#pwa-fab-install-btn {
  display: inline-block;
  width: 100%;
  box-sizing: border-box;
  margin-top: 10px;
  padding: 11px 16px;
  background: #000;
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  font-family: inherit;
}
#pwa-fab-install-btn:active {
  opacity: 0.85;
}
@media (prefers-color-scheme: dark) {
  #pwa-fab-panel {
    background: rgba(28, 28, 30, 0.92);
    border-color: rgba(255, 255, 255, 0.12);
    color: #f2f2f2;
  }
  #pwa-fab-panel p,
  #pwa-fab-panel li {
    color: #cfcfcf;
  }
  #pwa-fab-panel .pwa-hint {
    color: #8a8a8e;
  }
}