/* article.css - 专为长篇 SEO 科普文章设计的排版样式 */
.article-layout {
    max-width: 860px;
    margin: 0 auto;
    padding: 4rem 5%;
    min-height: 80vh;
}

.article-header {
    margin-bottom: 2.5rem;
}

.article-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.article-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* 目录 (TOC) */
.toc-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem 2rem;
    margin: 2rem 0 3rem 0;
    backdrop-filter: blur(10px);
}

.toc-box h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toc-box ul {
    list-style: none;
}

.toc-box ul li {
    margin-bottom: 0.75rem;
}

.toc-box ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
    font-size: 0.9375rem;
}

.toc-box ul li a:hover {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--accent);
}

/* 正文排版 (Prose) */
.prose h2 {
    font-size: 1.875rem;
    font-weight: 700;
    margin: 3rem 0 1.5rem;
    color: var(--text-primary);
    scroll-margin-top: 100px;
}

.prose h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.prose p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1.0625rem;
}

.prose a {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
    transition: color 0.2s;
}

.prose a:hover {
    color: var(--accent);
}

.prose strong {
    color: var(--text-primary);
    font-weight: 600;
}

.prose ul, .prose ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.prose li {
    margin-bottom: 0.5rem;
}

/* 相关阅读 */
.related-articles {
    margin-top: 5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border-color);
}

.related-articles h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.related-articles ul {
    list-style: none;
}

.related-articles li {
    margin-bottom: 1rem;
}

.related-articles a {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    transition: color 0.2s;
}

.related-articles a:hover {
    color: var(--accent);
}

/* 面包屑导航 */
.breadcrumb {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.breadcrumb a {
    color: var(--text-primary);
}