/* ========== 国内社交分享按钮 ========== */
.share-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  background: #f5f6fa;
  color: #333;
  border: 1px solid #e0e4e8;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  box-sizing: border-box;
}

.share-btn:hover {
  background: #eef2ff;
  border-color: #4f8cff;
  color: #4f8cff;
}

.share-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* 移动端：一排 5 个正圆，平均铺满整行 */
@media (max-width: 768px) {
  .share-buttons {
    /* 强制自己撑满外层容器 */
    width: 100%;
    max-width: 100%;
    flex: 1 1 100%;
    flex-wrap: nowrap;
    justify-content: space-between;
    align-items: center;
    gap: 0;
    margin: 10px 0;
    padding: 0 3vw;              /* 左右各留 3vw 呼吸空间 */
    box-sizing: border-box;
  }

  .share-btn {
    /* 关键：宽高用同一个 vw 值，保证正方形 */
    width: 16vw;
    height: 16vw;
    max-width: 72px;             /* 平板横屏时不至于过大 */
    max-height: 72px;
    flex: 0 0 auto;              /* 不让 flex 拉伸/压缩 */
    padding: 0;
    font-size: 0;                /* 隐藏文字 */
    gap: 0;
    border-radius: 50%;          /* 正方形 + 50% = 正圆 */
    display: flex;
    justify-content: center;
    align-items: center;
    box-sizing: border-box;
    line-height: 1;
  }

  .share-icon {
    width: 55%;                  /* 图标随按钮等比缩放 */
    height: 55%;
    max-width: 34px;
    max-height: 34px;
  }
}