/* 字体大小调节按钮样式 */
#font-size-toggle {
  position: fixed;
  top: 80px;
  right: 20px;
  width: 45px;
  height: 45px;
  background-color: rgba(255, 255, 255, 0.9);
  border: 2px solid #dce6f0;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  font-weight: bold;
  color: #2f4154;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 999;
  transition: all 0.3s ease;
  user-select: none;
}

#font-size-toggle:hover {
  background-color: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: scale(1.05);
}

#font-size-toggle:active {
  transform: scale(0.95);
}

/* 暗色模式适配 */
[data-user-color-scheme="dark"] #font-size-toggle {
  background-color: rgba(37, 45, 56, 0.9);
  border-color: #435266;
  color: #c4c6c9;
}

[data-user-color-scheme="dark"] #font-size-toggle:hover {
  background-color: #252d38;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* 移动端适配 */
@media (max-width: 768px) {
  #font-size-toggle {
    top: 70px;
    right: 15px;
    width: 40px;
    height: 40px;
    font-size: 14px;
  }
}