/* ==================== 全局重置与基础变量 ==================== */
:root {
    --primary-color: #ff4400;
    --primary-light: #fff5f0;
    --primary-dark: #d93800;
    --secondary-color: #1a73e8;
    --dark-color: #1a1a1a;
    --gray-dark: #4a4a4a;
    --gray: #666;
    --gray-light: #999;
    --gray-lighter: #f0f0f0;
    --gray-bg: #f8f8f8;
    --white: #ffffff;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.12);
    --radius: 8px;
    --radius-sm: 4px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "PingFang SC", "Helvetica Neue", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--gray-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

ul, ol {
    list-style: none;
}

/* ==================== 公共工具类 ==================== */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.text-gray { color: var(--gray) !important; }
.text-light { color: var(--gray-light) !important; }

.bg-primary { background-color: var(--primary-color) !important; }
.bg-white { background-color: var(--white) !important; }
.bg-light { background-color: var(--gray-lighter) !important; }

.btn {
    display: inline-block;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    border: none;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: var(--white);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

.section-title {
    position: relative;
    font-size: 22px;
    font-weight: 700;
    color: var(--dark-color);
    padding-bottom: 12px;
    margin-bottom: 20px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.card {
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* ==================== 头部导航 ==================== */
.site-header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    padding: 15px 0;
    border-bottom: 1px solid var(--gray-lighter);
}

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

.site-logo {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.site-logo span {
    font-size: 14px;
    font-weight: normal;
    color: var(--gray);
    opacity: 0.8;
}

.header-search {
    flex: 0 0 300px;
    position: relative;
}

.search-form {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 10px 40px 10px 15px;
    border: 1px solid var(--gray-lighter);
    border-radius: 20px;
    font-size: 14px;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 68, 0, 0.1);
}

.search-btn {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-light);
    cursor: pointer;
    padding: 5px;
}

.main-nav {
    padding: 0;
    background-color: var(--white);
}

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

.nav-menu {
    display: flex;
    gap: 5px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 15px 20px;
    color: var(--dark-color);
    font-size: 16px;
    font-weight: 500;
    white-space: nowrap;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20px;
    right: 20px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px 2px 0 0;
}

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark-color);
    cursor: pointer;
    padding: 10px;
}

.nav-mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    box-shadow: var(--shadow-lg);
    border-radius: 0 0 var(--radius) var(--radius);
    padding: 10px 0;
    z-index: 999;
}

.nav-mobile-menu.active {
    display: block;
}

.nav-mobile-item {
    border-bottom: 1px solid var(--gray-lighter);
}

.nav-mobile-item:last-child {
    border-bottom: none;
}

.nav-mobile-link {
    display: block;
    padding: 12px 20px;
    color: var(--dark-color);
    font-size: 16px;
}

.nav-mobile-link:hover,
.nav-mobile-link.active {
    color: var(--primary-color);
    background-color: var(--primary-light);
}

/* ==================== 首页样式 ==================== */
.home-hero {
    background: linear-gradient(135deg, #ff7b00 0%, #ff4400 100%);
    color: var(--white);
    padding: 60px 0;
    margin-bottom: 30px;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 25px;
}

.home-main {
    padding: 40px 0;
}

.home-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.news-card {
    position: relative;
    background-color: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.news-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-content {
    padding: 20px;
}

.news-category {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    font-size: 12px;
    font-weight: 500;
    border-radius: 12px;
    margin-bottom: 10px;
}

.news-title {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 10px;
    color: var(--dark-color);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-excerpt {
    color: var(--gray);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--gray-light);
}

.news-date {
    display: flex;
    align-items: center;
    gap: 5px;
}

.featured-news {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 30px;
}

.featured-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 30px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: var(--white);
}

.featured-category {
    display: inline-block;
    padding: 6px 15px;
    background-color: var(--primary-color);
    color: var(--white);
    font-size: 14px;
    font-weight: 500;
    border-radius: 15px;
    margin-bottom: 15px;
}

.featured-title {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 10px;
}

.featured-excerpt {
    opacity: 0.9;
    margin-bottom: 15px;
}

.sidebar-section {
    margin-bottom: 30px;
}

.sidebar-card {
    background-color: var(--white);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.trending-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.trending-item {
    padding-bottom: 15px;
    border-bottom: 1px solid var(--gray-lighter);
}

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

.trending-rank {
    display: inline-block;
    width: 24px;
    height: 24px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    text-align: center;
    line-height: 24px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    margin-right: 10px;
}

.trending-title {
    font-size: 15px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--dark-color);
}

.trending-title:hover {
    color: var(--primary-color);
}

.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-item {
    padding: 6px 12px;
    background-color: var(--gray-lighter);
    color: var(--gray-dark);
    border-radius: 15px;
    font-size: 13px;
    transition: var(--transition);
}

.tag-item:hover {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

/* ==================== 栏目页样式 ==================== */
.list-header {
    padding: 40px 0 20px;
    background-color: var(--white);
    margin-bottom: 30px;
}

.category-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.category-description {
    color: var(--gray);
    font-size: 16px;
    max-width: 800px;
}

.list-content {
    padding: 40px 0;
}

.list-filter {
    background-color: var(--white);
    padding: 20px;
    border-radius: var(--radius);
    margin-bottom: 30px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.filter-label {
    font-weight: 500;
    color: var(--gray-dark);
}

.filter-btn {
    padding: 6px 15px;
    background-color: var(--gray-lighter);
    border: none;
    border-radius: 15px;
    color: var(--gray-dark);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--primary-color);
    color: var(--white);
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.list-article-item {
    background-color: var(--white);
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.list-article-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(5px);
}

.list-article-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.list-article-category {
    padding: 4px 12px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.list-article-date {
    color: var(--gray-light);
    font-size: 14px;
}

.list-article-title {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.list-article-title:hover {
    color: var(--primary-color);
}

.list-article-excerpt {
    color: var(--gray);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 15px;
}

.list-article-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 15px;
    border-top: 1px solid var(--gray-lighter);
}

.list-article-meta {
    display: flex;
    gap: 15px;
    font-size: 13px;
    color: var(--gray-light);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 40px;
}

.pagination-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--white);
    border: 1px solid var(--gray-lighter);
    border-radius: var(--radius-sm);
    color: var(--gray-dark);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.pagination-item:hover,
.pagination-item.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}

/* ==================== 内容页样式 ==================== */
.article-header {
    padding: 40px 0 30px;
    background-color: var(--white);
}

.article-title {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.meta-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-weight: 600;
}

.author-name {
    font-weight: 500;
}

.article-cover {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 30px;
}

.article-content-wrapper {
    padding: 40px 0;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-body {
    background-color: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
    margin-bottom: 40px;
}

.article-body p {
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 17px;
    color: var(--gray-dark);
}

.article-body h2 {
    font-size: 24px;
    font-weight: 600;
    margin: 30px 0 15px;
    color: var(--dark-color);
}

.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 25px 0 15px;
    color: var(--dark-color);
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 20px 0;
}

.article-body blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 20px;
    margin: 25px 0;
    font-style: italic;
    color: var(--gray);
    font-size: 18px;
    background-color: var(--primary-light);
    padding: 20px;
    border-radius: 0 var(--radius) var(--radius) 0;
}

.article-tags {
    display: flex;
    gap: 10px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-lighter);
}

.article-footer {
    max-width: 800px;
    margin: 0 auto;
}

.article-actions {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background-color: var(--white);
    border: 1px solid var(--gray-lighter);
    border-radius: var(--radius);
    color: var(--gray-dark);
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.related-articles {
    background-color: var(--white);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
}

/* ==================== 底部样式 ==================== */
.site-footer {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 50px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 15px;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.contact-icon {
    color: var(--primary-color);
}

.footer-bottom {
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 992px) {
    .home-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 30px;
    }
    
    .article-title {
        font-size: 28px;
    }
    
    .nav-menu {
        gap: 0;
    }
    
    .nav-link {
        padding: 15px 15px;
        font-size: 15px;
    }
}

@media (max-width: 768px) {
    .header-top .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .header-search {
        flex: 0 0 100%;
        width: 100%;
    }
    
    .nav-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-mobile-toggle {
        display: block;
        align-self: flex-end;
    }
    
    .home-hero {
        padding: 40px 0;
    }
    
    .hero-title {
        font-size: 26px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .article-cover {
        height: 250px;
    }
    
    .article-body {
        padding: 25px;
    }
    
    .article-body p {
        font-size: 16px;
    }
    
    .filter-group {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 22px;
    }
    
    .section-title {
        font-size: 20px;
    }
    
    .article-title {
        font-size: 24px;
    }
    
    .list-article-item {
        padding: 20px;
    }
    
    .list-article-title {
        font-size: 18px;
    }
    
    .list-article-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .pagination-item {
        width: 35px;
        height: 35px;
        font-size: 13px;
    }
}