* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

:root {
    --primary-black: #0a0a0a;
    --secondary-black: #1a1a1a;
    --light-black: #2a2a2a;
    --dark-gray: #333333;
    --medium-gray: #666666;
    --light-gray: #999999;
    --lighter-gray: #cccccc;
    --off-white: #f5f5f5;
    --pure-white: #ffffff;
    --accent-color: #444444;
}

body {
    background-color: var(--off-white);
    color: var(--primary-black);
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background-color: var(--primary-black);
    color: var(--pure-white);
    padding: 1.2rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.logo span {
    color: var(--lighter-gray);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    color: var(--pure-white);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--lighter-gray);
}

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background-color: var(--pure-white);
    bottom: 0;
    left: 0;
    transition: width 0.3s;
}

nav ul li a:hover::after, nav ul li a.active::after {
    width: 100%;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--pure-white);
    font-size: 1.2rem;
    cursor: pointer;
}

/* 主要内容区域 */
.main-content {
    min-height: calc(100vh - 180px);
    padding: 2rem 0;
}

/* 页面内容 */
.page {
    display: none;
}

.page.active {
    display: block;
}

/* 搜索框样式 */
.search-section {
    max-width: 800px;
    margin: 0 auto 2rem;
}

.search-box {
    display: flex;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    overflow: hidden;
}

.search-box input {
    flex: 1;
    padding: 1rem 1.2rem;
    border: none;
    font-size: 1rem;
    background-color: var(--pure-white);
    color: var(--primary-black);
}

.search-box button {
    background-color: var(--primary-black);
    color: var(--pure-white);
    border: none;
    padding: 0 1.8rem;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.search-box button:hover {
    background-color: var(--dark-gray);
}

.search-tips {
    margin-top: 0.8rem;
    font-size: 0.85rem;
    color: var(--medium-gray);
    text-align: center;
}

/* 首页三栏布局 */
.home-page .page-header {
    margin-bottom: 1.5rem;
    text-align: center;
}

.home-page .page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.4rem;
    letter-spacing: 1px;
}

.home-page .page-header p {
    color: var(--medium-gray);
    font-size: 1.1rem;
}

.three-columns {
    display: flex;
    gap: 2rem;
}

.column {
    flex: 1;
    background-color: var(--pure-white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.column:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.column h2 {
    font-size: 1.4rem;
    margin-bottom: 1.2rem;
    padding-bottom: 0.7rem;
    border-bottom: 2px solid var(--accent-color);
    display: flex;
    align-items: center;
}

.column h2 i {
    margin-right: 0.6rem;
}

.column-list {
    list-style: none;
}

.column-item {
    margin-bottom: 0.9rem;
    padding-bottom: 0.9rem;
    border-bottom: 1px solid var(--off-white);
    transition: padding-left 0.2s;
}

.column-item:hover {
    padding-left: 0.5rem;
}

.column-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.column-item h3 {
    font-size: 1rem;
    margin-bottom: 0.4rem;
    color: var(--secondary-black);
    line-height: 1.2;
    font-weight: 600;
}

.column-item .meta {
    font-size: 0.8rem;
    color: var(--light-gray);
    display: flex;
    justify-content: space-between;
}

.read-time {
    font-style: italic;
}

/* 列表页样式 */
.list-page .page-header {
    margin-bottom: 2rem;
}

.list-page .page-header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.8rem;
}

.list-page .page-header p {
    color: var(--medium-gray);
    font-size: 1rem;
    max-width: 800px;
}

.list-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.8rem;
}

.list-item {
    background-color: var(--pure-white);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.list-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.list-item h2 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    color: var(--secondary-black);
}

.list-item p {
    color: var(--medium-gray);
    margin-bottom: 1rem;
    line-height: 1.4;
    font-size: 0.95rem;
}

.list-item .meta {
    display: flex;
    justify-content: space-between;
    color: var(--light-gray);
    font-size: 0.85rem;
}

/* 搜索结果页样式 */
.search-results-page .page-header {
    margin-bottom: 2rem;
    text-align: center;
}

.search-results-page .page-header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.8rem;
}

.search-results-page .page-header p {
    color: var(--medium-gray);
    font-size: 1rem;
    max-width: 800px;
}

.search-results-page .search-term {
    color: var(--primary-black);
    font-weight: 600;
}

.search-results-page .results-count {
    color: var(--medium-gray);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.search-results-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.8rem;
    margin-bottom: 2rem;
}

.search-result-item {
    background-color: var(--pure-white);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.search-result-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.search-result-item h2 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    color: var(--secondary-black);
}

.search-result-item p {
    color: var(--medium-gray);
    margin-bottom: 1rem;
    line-height: 1.4;
    font-size: 0.95rem;
}

.search-result-item .meta {
    display: flex;
    justify-content: space-between;
    color: var(--light-gray);
    font-size: 0.85rem;
}

.no-results {
    text-align: center;
    padding: 3rem;
    color: var(--medium-gray);
    font-size: 1.1rem;
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
    gap: 0.5rem;
}

.pagination-btn {
    padding: 0.5rem 1rem;
    background-color: var(--pure-white);
    border: 1px solid var(--lighter-gray);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--dark-gray);
    transition: all 0.2s;
    min-width: 40px;
    text-align: center;
}

.pagination-btn:hover {
    background-color: var(--off-white);
}

.pagination-btn.active {
    background-color: var(--primary-black);
    color: var(--pure-white);
    border-color: var(--primary-black);
}

.pagination-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-info {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--medium-gray);
}

/* 多分类文章列表页样式 */
.category-page .page-header {
    margin-bottom: 2rem;
}

.category-page .page-header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.8rem;
}

.category-page .page-header p {
    color: var(--medium-gray);
    font-size: 1rem;
    max-width: 800px;
}

.category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--lighter-gray);
    padding-bottom: 0.5rem;
}

.category-tab {
    padding: 0.6rem 1.2rem;
    background-color: var(--pure-white);
    border: 1px solid var(--lighter-gray);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--dark-gray);
    transition: all 0.2s;
}

.category-tab:hover {
    background-color: var(--off-white);
}

.category-tab.active {
    background-color: var(--primary-black);
    color: var(--pure-white);
    border-color: var(--primary-black);
}

.category-content {
    display: none;
}

.category-content.active {
    display: block;
}

.category-content h2 {
    font-size: 1.5rem;
    margin-bottom: 1.2rem;
    padding-bottom: 0.7rem;
    border-bottom: 2px solid var(--accent-color);
}

.category-articles {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.category-article {
    background-color: var(--pure-white);
    border-radius: 8px;
    padding: 1.3rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.category-article:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.category-article h3 {
    font-size: 1.1rem;
    margin-bottom: 0.6rem;
    color: var(--secondary-black);
}

.category-article p {
    color: var(--medium-gray);
    margin-bottom: 0.8rem;
    line-height: 1.4;
    font-size: 0.9rem;
}

.category-article .meta {
    display: flex;
    justify-content: space-between;
    color: var(--light-gray);
    font-size: 0.8rem;
}

/* 文章页样式 */
.article-page .article-header {
    margin-bottom: 2rem;
    text-align: center;
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}

.article-page .article-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.article-page .article-header .meta {
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--light-gray);
    font-size: 0.95rem;
    margin-bottom: 1.2rem;
}

.article-page .article-header .meta span {
    margin: 0 1rem;
}

.article-content {
    max-width: 1000px;
    margin: 0 auto;
    background-color: var(--pure-white);
    padding: 2.5rem 3rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.article-content p {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--dark-gray);
}

.article-content h2 {
    font-size: 1.8rem;
    margin: 2.5rem 0 1.5rem;
    color: var(--secondary-black);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
}

.article-content h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1.2rem;
    color: var(--secondary-black);
}

.article-content blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--medium-gray);
    line-height: 1.6;
    font-size: 1.05rem;
}

/* 返回列表按钮 */
.back-to-list {
    display: inline-flex;
    align-items: center;
    margin-bottom: 2rem;
    padding: 0.6rem 1.2rem;
    background-color: var(--pure-white);
    color: var(--primary-black);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all 0.2s;
}

.back-to-list:hover {
    background-color: var(--off-white);
    transform: translateX(-3px);
}

.back-to-list i {
    margin-right: 0.5rem;
}

/* 文章导航样式 */
.article-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--lighter-gray);
}

.article-nav-link {
    max-width: 45%;
    padding: 1rem 1.5rem;
    background-color: var(--pure-white);
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
    text-decoration: none;
    color: var(--primary-black);
}

.article-nav-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.article-nav-link.prev {
    text-align: left;
}

.article-nav-link.next {
    text-align: right;
}

.nav-label {
    display: block;
    font-size: 0.85rem;
    color: var(--medium-gray);
    margin-bottom: 0.3rem;
}

.nav-title {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary-black);
    line-height: 1.3;
}

/* 页脚样式 */
footer {
    background-color: var(--primary-black);
    color: var(--pure-white);
    padding: 2.5rem 0 1.8rem;
    margin-top: 2.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 3rem;
}

.footer-section {
    flex: 1;
    min-width: 300px;
}

.footer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
    color: var(--lighter-gray);
}

.footer-section p, .footer-section a {
    color: var(--light-gray);
    line-height: 1.6;
    margin-bottom: 0.6rem;
    display: block;
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.9rem;
}

.footer-section a:hover {
    color: var(--pure-white);
}

.footer-links-columns {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-links-column {
    display: flex;
    flex-direction: column;
}

.copyright {
    text-align: center;
    margin-top: 2.5rem;
    padding-top: 1.8rem;
    border-top: 1px solid var(--light-black);
    color: var(--light-gray);
    font-size: 0.85rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .three-columns {
        flex-direction: column;
    }
    
    .list-container {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    .search-results-container {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    .category-articles {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    .footer-links-columns {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    nav ul {
        margin-top: 1.2rem;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    nav ul li {
        margin: 0 0.5rem 0.5rem;
    }
    
    .home-page .page-header h1 {
        font-size: 2rem;
    }
    
    .search-box {
        flex-direction: column;
    }
    
    .search-box button {
        padding: 0.8rem;
    }
    
    .list-container {
        grid-template-columns: 1fr;
    }
    
    .search-results-container {
        grid-template-columns: 1fr;
    }
    
    .category-articles {
        grid-template-columns: 1fr;
    }
    
    .article-content {
        padding: 1.8rem 1.5rem;
        max-width: 95%;
    }
    
    .article-page .article-header h1 {
        font-size: 2rem;
    }
    
    .article-page .article-header {
        max-width: 95%;
    }
    
    .column-item .meta {
        flex-direction: column;
    }
    
    .column-item .meta .read-time {
        margin-top: 0.2rem;
    }
    
    .home-page .page-header p {
        font-size: 1rem;
    }
    
    .column {
        padding: 1.2rem;
    }
    
    .column h2 {
        font-size: 1.3rem;
    }
    
    .category-tabs {
        justify-content: center;
    }
    
    .pagination {
        flex-wrap: wrap;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }
    
    .footer-section {
        min-width: 100%;
    }
    
    .footer-links-columns {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .article-content h2 {
        font-size: 1.6rem;
    }
    
    .article-content h3 {
        font-size: 1.4rem;
    }
    
    .article-content p {
        font-size: 1.05rem;
    }
    
    .article-navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .article-nav-link {
        max-width: 100%;
    }
}

/* 暗色模式 */
body.dark-mode {
    background-color: var(--secondary-black);
    color: var(--off-white);
}

body.dark-mode .search-box input {
    background-color: var(--light-black);
    color: var(--off-white);
}

body.dark-mode .column,
body.dark-mode .list-item,
body.dark-mode .search-result-item,
body.dark-mode .article-content,
body.dark-mode .category-article,
body.dark-mode .back-to-list,
body.dark-mode .article-nav-link {
    background-color: var(--light-black);
    color: var(--lighter-gray);
}

body.dark-mode .column h2,
body.dark-mode .list-item h2,
body.dark-mode .search-result-item h2,
body.dark-mode .article-content h2,
body.dark-mode .article-content h3,
body.dark-mode .category-content h2,
body.dark-mode .category-article h3,
body.dark-mode .nav-title {
    color: var(--off-white);
}

body.dark-mode .column-item h3 {
    color: var(--lighter-gray);
}

body.dark-mode .column-item p,
body.dark-mode .list-item p,
body.dark-mode .search-result-item p,
body.dark-mode .article-content p,
body.dark-mode .category-article p {
    color: var(--light-gray);
}

body.dark-mode footer {
    background-color: var(--primary-black);
}

body.dark-mode .category-tab {
    background-color: var(--light-black);
    color: var(--off-white);
    border-color: var(--medium-gray);
}

body.dark-mode .category-tab:hover {
    background-color: var(--medium-gray);
}

body.dark-mode .category-tab.active {
    background-color: var(--off-white);
    color: var(--primary-black);
    border-color: var(--off-white);
}

body.dark-mode .pagination-btn {
    background-color: var(--light-black);
    color: var(--off-white);
    border-color: var(--medium-gray);
}

body.dark-mode .pagination-btn:hover {
    background-color: var(--medium-gray);
}

body.dark-mode .pagination-btn.active {
    background-color: var(--off-white);
    color: var(--primary-black);
    border-color: var(--off-white);
}

/* 搜索结果高亮 */
.highlight {
    background-color: rgba(255, 255, 0, 0.2);
    padding: 0 2px;
    border-radius: 2px;
}