body {
    font-family: Arial, sans-serif;
    font-size: 18px;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #333;
}

header nav {
    background-color: #fafafa;
    padding: 25px 0;
    border-bottom: 1px solid #e0e0e0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

header nav ul.nav {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: flex-end;
    gap: 30px;
    margin-right: 20px;
}

header nav ul.nav li a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
    font-size: 16px;
    padding: 10px 15px;
    transition: background-color 0.3s ease-in-out;
}

header nav ul.nav li a:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

main {
    max-width: 1048px;
    margin: 90px auto 30px;
    padding: 20px;
    background-color: #ffffff;
    line-height: 1.8;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
}

h1 {
    text-align: center;
    font-size: 2.3em;
    margin-bottom: 20px;
}

footer {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: #666;
    border-top: 1px solid rgba(0, 0, 0, 0.2);
}

a {
    color: #0969DA;
    text-decoration: underline;
}

a:hover {
    text-decoration: underline;
}

:target::before {
    content: '';
    display: block;
    height: 100px;
    margin-top: -100px;
}

blockquote {
    border-left: 4px solid #cccccc; /* 改为灰色竖线 */
    padding-left: 15px;
    margin-left: 0;
    margin-right: 0;
    color: #555;
    background-color: #f8f8f8;
    padding: 10px 15px;
    border-radius: 3px;
}

blockquote p {
    margin-top: 10px;
    margin-bottom: 10px;
}
