/* ===== 防复制 / 防保存 全局保护样式 ===== */
html, body {
  -webkit-user-select: none !important;
  -moz-user-select: none !important;
  -ms-user-select: none !important;
  user-select: none !important;
  -webkit-touch-callout: none !important;
}

/* 禁止图片拖拽 */
img, svg, canvas {
  -webkit-user-drag: none !important;
  pointer-events: auto;
}

/* 打印时隐藏全部内容（防另存/打印为 PDF） */
@media print {
  html, body { display: none !important; }
}

/* 返回主页悬浮按钮 */
.back-home {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 99999;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 999px;
  background: rgba(47, 134, 216, .92);
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .5px;
  text-decoration: none;
  box-shadow: 0 4px 18px rgba(0, 0, 0, .45);
  transition: transform .18s ease, background .18s ease;
}
.back-home:hover { transform: translateY(-2px); background: rgba(59, 152, 240, .98); }
.back-home .ico { font-size: 15px; line-height: 1; }

/* 选中水印提示条（触发受限操作时闪现） */
.guard-toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%) translateY(20px);
  z-index: 100000;
  padding: 10px 22px;
  border-radius: 10px;
  background: rgba(20, 24, 32, .94);
  border: 1px solid rgba(229, 72, 77, .55);
  color: #ffb4b6;
  font-size: 13px;
  letter-spacing: .5px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.guard-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}