/*设置根元素的样式，包括字体、背景颜色*/
html
{
    height: 100%;
    font-size: 14px;
    font-family:
        "Open Sans", sans-serif;
}

body {
    min-height: 100%;
    margin: 0;
    color: #000;
}

img
{
    display: block;
    margin: 0 auto;
    max-width: 100%;
    border: 5px solid black;
}

hr
{
    border: none;
    height: 3px;
    background-color: black;
    width: 100%;
    margin: 0 0 28px;
}

a
{
    color: blue;
    text-decoration: none;
}

a:hover,
a:focus
{
    color: green;
    text-decoration: underline;
}

.grid-layout
{
    border: 4px solid #000;
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 800px 1fr;
    box-sizing: border-box;
}

.grid-layout .left
{
    border: 4px solid #000;
    background: #00539f;
}

.grid-layout .middle
{
    border: 4px solid #000;
    background: #ff9500;
    padding: 0 42px 48px;
    box-sizing: border-box;
}

.grid-layout .right
{
    border: 4px solid #000;
    background: #00539f;
}

.article {
    max-width: 700px;
    margin: 0 auto;
}

.article-header {
    padding: 34px 0 26px;
    text-align: center;
}

.article-label {
    margin: 0 0 10px;
    color: #00539f;
    font-size: 16px;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.article h1 {
    margin: 0;
    color: #00539f;
    font-size: 56px;
    line-height: 1.1;
    text-shadow: 3px 2px 1px #000;
    overflow-wrap: anywhere;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 16px 0 0;
    font-size: 15px;
    letter-spacing: 1px;
}

.article-content {
    padding: 0 10px;
}

.article-content p,
.article-content li {
    font-size: 18px;
    line-height: 1.8;
    letter-spacing: .5px;
}

.article-content h2,
.article-content h3 {
    margin: 32px 0 12px;
    color: #00539f;
    line-height: 1.3;
}

.article-content h2 {
    font-size: 30px;
}

.article-content h3 {
    font-size: 24px;
}

.article-content ul,
.article-content ol {
    padding-left: 30px;
}

.article-content blockquote {
    margin: 24px 0;
    padding: 12px 20px;
    border-left: 6px solid #00539f;
    background: #fff;
}

.article-content code {
    padding: 2px 5px;
    background: #fff;
    font-family: Consolas, monospace;
}

.article-content pre {
    overflow-x: auto;
    padding: 16px;
    border: 3px solid #000;
    background: #fff;
}

.article-content pre code {
    padding: 0;
}

@media (max-width: 900px) {
    .grid-layout {
        grid-template-columns: 18px minmax(0, 1fr) 18px;
    }
}

@media (max-width: 520px) {
    .grid-layout .middle {
        padding-right: 14px;
        padding-left: 14px;
    }

    .article-header {
        padding-top: 24px;
    }

    .article h1 {
        font-size: 42px;
    }

    .article-content {
        padding: 0;
    }

    .article-content p,
    .article-content li {
        font-size: 16px;
    }
}