/*
Theme Name: SEO Base 
Theme URI: https://example.com/seobase  
Author: Your Name 
Author URI: https://example.com  
Description: 简洁高效的SEO优化WordPress主题，自适应设计，代码精简，加载迅速。
Version: 1.0.0 
License: GNU General Public License v2 or later 
License URI: http://www.gnu.org/licenses/gpl-2.0.html  
Text Domain: seobase 
*/
 
/* ===== CSS变量 ===== */
:root {
    --color-bg: #fafafa;
    --color-bg-alt: #ffffff;
    --color-text: #1a1a2e;
    --color-text-muted: #4a4a5a;
    --color-primary: #0d7377;
    --color-primary-hover: #14a3a8;
    --color-border: #e2e2e2;
    --color-accent: #e94560;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --radius: 8px;
    --max-width: 1200px;
    --content-width: 720px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-serif: Georgia, "Times New Roman", serif;
}
 
/* ===== 重置样式 ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
 
html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}
 
body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
}
 
/* ===== 链接样式 ===== */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}
 
a:hover {
    color: var(--color-primary-hover);
}
 
/* ===== 图片 ===== */
img {
    max-width: 100%;
    height: auto;
    display: block;
}
 
/* ===== 容器 ===== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}
 
/* ===== 头部 ===== */
.site-header {
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}
 
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
 
.site-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}
 
.site-logo:hover {
    color: var(--color-primary);
}
 
/* ===== 导航菜单 ===== */
.main-nav ul {
    display: flex;
    list-style: none;
    gap: 8px;
}
 
.main-nav a {
    display: block;
    padding: 8px 16px;
    color: var(--color-text);
    font-weight: 500;
    border-radius: var(--radius);
    transition: background 0.2s ease, color 0.2s ease;
}
 
.main-nav a:hover,
.main-nav .current-menu-item a {
    background: var(--color-primary);
    color: #fff;
}
 
/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
 
.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    margin: 5px 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}
 
/* ===== 主体布局 ===== */
.site-main {
    padding: 40px 0;
}
 
.content-area {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 40px;
}
 
.primary-content {
    min-width: 0;
}
 
/* ===== 文章卡片 ===== */
.post-card {
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    overflow: hidden;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}
 
.post-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
 
.post-card-thumbnail {
    aspect-ratio: 16/9;
    overflow: hidden;
}
 
.post-card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}
 
.post-card:hover .post-card-thumbnail img {
    transform: scale(1.03);
}
 
.post-card-content {
    padding: 24px;
}
 
.post-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}
 
.post-card-title {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 12px;
}
 
.post-card-title a {
    color: var(--color-text);
}
 
.post-card-title a:hover {
    color: var(--color-primary);
}
 
.post-card-excerpt {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}
 
/* ===== 文章详情 ===== */
.single-post {
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 40px;
}
 
.entry-header {
    margin-bottom: 32px;
}
 
.entry-title {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
}
 
.entry-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}
 
.entry-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}
 
.entry-thumbnail {
    margin-bottom: 32px;
    border-radius: var(--radius);
    overflow: hidden;
}
 
.entry-content {
    font-size: 1.0625rem;
    line-height: 1.8;
}
 
.entry-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 2em 0 1em;
}
 
.entry-content h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin: 1.5em 0 0.75em;
}
 
.entry-content p {
    margin-bottom: 1.5em;
}
 
.entry-content ul,
.entry-content ol {
    margin: 1em 0 1.5em 1.5em;
}
 
.entry-content li {
    margin-bottom: 0.5em;
}
 
.entry-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding: 16px 24px;
    margin: 1.5em 0;
    background: var(--color-bg);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
}
 
.entry-content pre {
    background: #1a1a2e;
    color: #e2e2e2;
    padding: 20px;
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.875rem;
    margin: 1.5em 0;
}
 
.entry-content code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.875em;
}
 
.entry-content pre code {
    background: none;
    padding: 0;
}
 
.entry-content img {
    border-radius: var(--radius);
    margin: 1.5em 0;
}
 
/* ===== 标签与分类 ===== */
.entry-tags,
.entry-categories {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}
 
.entry-tags a,
.entry-categories a {
    display: inline-block;
    background: var(--color-bg);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.875rem;
    margin: 4px;
    transition: background 0.2s ease;
}
 
.entry-tags a:hover,
.entry-categories a:hover {
    background: var(--color-primary);
    color: #fff;
}
 
/* ===== 侧边栏 ===== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}
 
.widget {
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 24px;
}
 
.widget-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-primary);
}
 
.widget ul {
    list-style: none;
}
 
.widget li {
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
}
 
.widget li:last-child {
    border-bottom: none;
}
 
.widget a {
    color: var(--color-text);
}
 
.widget a:hover {
    color: var(--color-primary);
}
 
/* ===== 搜索框 ===== */
.search-form {
    display: flex;
}
 
.search-form input[type="search"] {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius) 0 0 var(--radius);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease;
}
 
.search-form input[type="search"]:focus {
    border-color: var(--color-primary);
}
 
.search-form button {
    padding: 12px 20px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 0 var(--radius) var(--radius) 0;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s ease;
}
 
.search-form button:hover {
    background: var(--color-primary-hover);
}
 
/* ===== 分页 ===== */
/* ===== 分页 ===== */ 
.pagination { 
    display: flex; 
    justify-content: center; 
    gap: 8px; 
    margin-top: 40px; 
    flex-wrap: wrap; /* 确保在小屏幕上自动换行 */ 
} 
 
.pagination a, 
.pagination span { 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    min-width: 44px; 
    height: 44px; 
    padding: 0 16px; 
    background: var(--color-bg-alt); 
    border-radius: var(--radius); 
    font-weight: 500; 
    color: var(--color-text); 
    transition: background 0.2s ease, color 0.2s ease; 
    text-decoration: none; /* 移除链接下划线 */ 
} 
 
.pagination a:hover, 
.pagination .current { 
    background: var(--color-primary); 
    color: #fff; 
} 
 
/* 确保分页始终水平排列，即使在小屏幕上 */ 
@media (max-width: 480px) { 
    .pagination { 
        gap: 4px; 
    } 
    .pagination a, 
    .pagination span { 
        min-width: 36px; 
        height: 36px; 
        padding: 0 10px; 
        font-size: 0.875rem; 
    } 
} 
 
/* ===== 底部 ===== */
.site-footer {
    background: #1a1a2e;
    color: #a0a0b0;
    margin-top: 60px;
}
 
.footer-widgets {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    padding: 60px 0;
}
 
.footer-widgets .widget-title {
    color: #fff;
    border-bottom-color: var(--color-accent);
}
 
.footer-widgets a {
    color: #d0d0e0;
}
 
.footer-widgets a:hover {
    color: var(--color-accent);
}
 
.footer-bottom {
    border-top: 1px solid #2a2a3e;
    padding: 24px 0;
    text-align: center;
    font-size: 0.875rem;
}
 
/* ===== 面包屑导航 ===== */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}
 
.breadcrumb a {
    color: var(--color-text-muted);
}
 
.breadcrumb a:hover {
    color: var(--color-primary);
}
 
.breadcrumb-sep {
    color: var(--color-border);
}
 
/* ===== 相关文章 ===== */
.related-posts {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}
 
.related-posts-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 20px;
}
 
.related-posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
 
.related-post-item {
    background: var(--color-bg);
    border-radius: var(--radius);
    overflow: hidden;
}
 
.related-post-item img {
    aspect-ratio: 16/10;
    object-fit: cover;
}
 
.related-post-item h4 {
    padding: 12px;
    font-size: 0.9375rem;
    font-weight: 600;
}
 
.related-post-item h4 a {
    color: var(--color-text);
}
 
/* ===== 作者信息 ===== */
.author-box {
    display: flex;
    gap: 20px;
    background: var(--color-bg);
    padding: 24px;
    border-radius: var(--radius);
    margin-top: 32px;
}
 
.author-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}
 
.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
 
.author-info h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 8px;
}
 
.author-info p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}
 
/* ===== 评论区 ===== */
.comments-area {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}
 
.comments-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 24px;
}
 
.comment-list {
    list-style: none;
}
 
.comment {
    padding: 20px;
    background: var(--color-bg);
    border-radius: var(--radius);
    margin-bottom: 16px;
}
 
.comment-author {
    font-weight: 600;
}
 
.comment-meta {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}
 
.comment-reply-link {
    font-size: 0.875rem;
    font-weight: 500;
}
 
/* ===== 404页面 ===== */
.error-404 {
    text-align: center;
    padding: 80px 20px;
}
 
.error-404 h1 {
    font-size: 8rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}
 
.error-404 p {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin: 20px 0 40px;
}
 
/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: background 0.2s ease, transform 0.2s ease;
}
 
.btn:hover {
    background: var(--color-primary-hover);
    color: #fff;
    transform: translateY(-1px);
}
 
.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}
 
.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
}
 
/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .content-area {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-widgets {
        grid-template-columns: repeat(2, 1fr);
    }
}
 
@media (max-width: 768px) {
    .header-inner {
        height: 56px;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .main-nav {
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--color-bg-alt);
        border-bottom: 1px solid var(--color-border);
        padding: 16px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 4px;
    }
    
    .main-nav a {
        padding: 12px 16px;
    }
    
    .single-post {
        padding: 24px;
    }
    
    .entry-title {
        font-size: 1.75rem;
    }
    
    .related-posts-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        grid-template-columns: 1fr;
    }
    
    .footer-widgets {
        grid-template-columns: 1fr;
        padding: 40px 0;
    }
    
    .author-box {
        flex-direction: column;
        text-align: center;
    }
    
    .author-avatar {
        margin: 0 auto;
    }
}
 
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .post-card-content {
        padding: 16px;
    }
    
    .post-card-title {
        font-size: 1.25rem;
    }
    
    .entry-content {
        font-size: 1rem;
    }
    
    .error-404 h1 {
        font-size: 5rem;
    }
}
 
/* ===== 打印样式 ===== */
@media print {
    .site-header,
    .sidebar,
    .site-footer,
    .pagination,
    .related-posts,
    .comments-area {
        display: none;
    }
    
    .content-area {
        display: block;
    }
    
    .single-post {
        box-shadow: none;
        padding: 0;
    }
}