body {
    margin: 0;
    padding: 0;
    background-color: #121212;
    /* 深色背景 */
    color: #ffffff;
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

.top-nav {
    width: 100%;
    padding: 20px 0;
    display: flex;
    justify-content: center;
    background-color: #1a1a1a;
}

.language-flags-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px; /* 两排之间的间距 */
}

.flag-row {
  display: flex;
  justify-content: center;
  gap: 12px; /* 国旗之间的水平间距 */
  flex-wrap: wrap;
}

.flag-btn {
  background: none;
  border: 2px solid transparent;
  padding: 0;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
  border-radius: 4px;
  overflow: hidden;
  display: flex;
}

.flag-btn img {
  width: 42px; /* 可以根据需要调整国旗大小 */
  height: auto;
  display: block;
}

.flag-btn:hover {
  transform: scale(1.1);
  border-color: #6090ff; /* 悬停时显示蓝色边框 */
}

footer {
    text-align: center;
    width: 90%;
    margin-top: auto;
    padding: 14px 0;
    border-top: 2px solid #333;
    color: #666;
    font-size: 0.9rem;
}