body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
    padding: 0;
}

.container {
    width: 800px;
    margin: 0 auto;
    padding: 20px;
    border: 2px solid #ccc;
    border-radius: 10px;
}

h1 {
    font-size: 2.5rem;
    color: #333;
    margin-bottom: 20px;
    border-bottom: 2px solid #ccc;
    padding-bottom: 10px;
}

p {
    font-size: 1.4rem;
    color: #666;
    margin-bottom: 20px;
    text-align: left;
    text-indent: 2em;
    line-height: 1.6;
}

.red-button,
.grey-button {
    display: inline-block;
    border: none;
    padding: 10px 20px;
    font-size: 1.5rem;
    cursor: pointer;
    text-decoration: none;
    margin-right: 10px;
    transition: background-color 0.3s;
}

.red-button {
    background-color: #dc3545;
    color: #fff;
}

.grey-button {
    background-color: #ccc;
    color: #fff;
}

.red-button:hover,
.grey-button:hover {
    filter: brightness(90%);
}

footer {
    margin-top: 20px;
    font-size: 1rem;
    color: #666;
}

footer a {
    color: inherit;
    text-decoration: none;
}


.wrapper {
  width: 600px;
  margin: 0 auto;
  padding: 20px;
}

h2 {
  text-align: center;
  border: 2px solid orange;
  border-radius: 10px;
  padding: 10px;
}

.list-container {
    margin-top: 20px;
    display: flex; /* 使用弹性布局 */
    flex-wrap: wrap; /* 允许自动换行 */
    gap: 40px; /* 设置行间距 */
}

ol {
    list-style-type: none;
    padding: 0;
}

li {
    margin-bottom: 20px; /* 增大上下行之间的间距 */
    font-size: 19px; /* 增大文字字号 */
    display: flex;
    align-items: baseline;
    counter-increment: item;
    position: relative;
    flex-basis: calc(50% - 20px); /* 每一列占据50%，减去间距 */
}

li::before {
    content: counter(item) ".";
    display: inline-block;
    width: 1em;
    margin-right: 10px; /* 增大文字左右间距 */
    color: orange; /* 序号颜色 */
    font-weight: bold; /* 序号加粗 */
}

.list-container ol {
    counter-reset: item;
}

li:nth-child(odd) {
    margin-top: 1em; /* 调整奇数行的上边距 */
}

.link-with-hover {
    text-decoration: none; /* 去除超链接下划线 */
    color: inherit; /* 继承父元素文字颜色 */
}

.link-with-hover:hover {
    color: orange; /* 鼠标指向时的文字颜色 */
}

.remark {
    margin-left: auto; /* 右对齐 */
    color: gray; /* 备注文字颜色 */
}