body {
    font-family: sans-serif;
    font-size: 18px; 
    line-height: 1.5;
    color: #e0e0e0; 
    background-color: #222222; 
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基本样式 */
html {
    font-size: 18px;
    line-height: 1.5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #e0e0e0;
    background-color: #222222;
    max-width: 100%;
    overflow-x: hidden;
}

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
    margin: 1.5rem 0 1rem;
    font-weight: 700;
    line-height: 1.4;
}

h1 {
    font-size: 2rem;
    border-bottom: 2px solid #d0d0d0;
    padding-bottom: 0.5rem;
}

h2 {
    font-size: 1.75rem;
    border-bottom: 1px solid #b0b0b0;
    padding-bottom: 0.3rem;
}

h3 {
    font-size: 1.5rem;
}

p, ul, ol {
    margin: 1rem 0;
}

a {
    color: #a0c8ff;
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 2px;
}

/* a:hover, a:focus {
    background-color: #333;
} */

a:visited {
    color: #c0a0ff;
}

/* 头部 */
header {
    padding: 1.5rem 0;
    border-bottom: 3px solid #d0d0d0;
    margin-bottom: 2rem;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

/* 将 nav ul 限定在 header 内，避免影响 TOC */
header nav ul {
    display: flex;
    list-style: none;
    margin: 0;
}

header nav ul li {
    margin-left: 1.5rem;
}

header nav a {
    font-weight: 600;
    text-decoration: none;
}

main {
    min-height: 70vh;
    padding-bottom: 3rem;
}
.posts-list {
    list-style: none;
    margin: 2rem 0;
}

.posts-list li {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border: 1px solid #444;
}

.posts-list a {
    text-decoration: none;
    display: block;
}

.posts-list h2, .posts-list h3 {
    margin-top: 0;
    border-bottom: none;
}

.post-date {
    display: block;
    font-size: 0.9rem;
    margin: 0.5rem 0;
    font-style: italic;
}

/* 英文标题 */
.english-title {
    font-size: 1.2rem;
    font-weight: 500;
    color: #b0b0b0;
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: none;
    padding-bottom: 0;
}

.posts-list .english-title {
    font-size: 1.1rem;
    margin-top: 0.2rem;
    margin-bottom: 0.5rem;
}

.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 2rem 0;
    padding: 1rem 0;
    border-top: 1px solid #444;
}

.pagination a {
    padding: 0.5rem 1rem;
    border: 1px solid #d0d0d0;
    text-decoration: none;
    font-weight: 600;
    min-width: 100px;
    text-align: center;
}

.pagination .prev {
    margin-right: auto;
}

.pagination .next {
    margin-left: auto;
}

/* 文章内容 */
.content {
    margin: 2rem 0;
}

.content p {
    margin: 1.5rem 0;
}

.content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 2rem auto;
    border: 1px solid #444;
}

.content ul, .content ol {
    margin: 1.5rem 0 1.5rem 2rem;
}

.content li {
    margin: 0.5rem 0;
}

.content blockquote {
    border-left: 4px solid #d0d0d0;
    padding-left: 1rem;
    margin: 1.5rem 0;
    font-style: italic;
}

.content code {
    font-family: monospace;
    background-color: #333;
    padding: 0.2rem 0.4rem;
    border-radius: 2px;
}

.content pre {
    background-color: #2a2a2a;
    padding: 1rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid #444;
}

.content pre code {
    background-color: transparent;
    padding: 0;
}

.table-of-contents {
    background-color: #2a2a2a;
    padding: 1.5rem;
    margin: 2rem 0;
    border: 1px solid #444;
}

.table-of-contents h2 {
    margin-top: 0;
    font-size: 1.3rem;
    border-bottom: 1px solid #d0d0d0;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.table-of-contents ul {
    list-style: none;
    padding-left: 1rem;
    margin: 0;
}

.table-of-contents li {
    display: list-item;
    margin: 0.5rem 0;
}

.table-of-contents li a {
    text-decoration: underline;
    color: #a0c8ff;
}

.table-of-contents li a:visited {
    color: #c0a0ff;
}

/* 文章导航 */
.post-navigation {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 2px solid #444;
}

.prev-post, .next-post {
    padding: 1rem;
    border: 1px solid #444;
    display: inline-block;
}

/* 页脚 */
footer {
    padding: 2rem 0;
    border-top: 3px solid #d0d0d0;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
    html {
        font-size: 16px;
    }
    
    header .container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    header nav ul {
        margin-top: 1rem;
    }

    header nav ul li:first-child {
        margin-left: 0;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 18px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.3rem;
    }
    
    .pagination {
        flex-direction: column;
        gap: 1rem;
    }
    
    .pagination a {
        width: 100%;
  }
}