/* 基础样式设置 */
:root {
    --primary: #165DFF;
    --primary-light: #E8F3FF;
    --secondary: #FF7D00;
    --text-dark: #1D2129;
    --text-medium: #4E5969;
    --text-light: #86909C;
    --bg-light: #F2F3F5;
    --white: #FFFFFF;
    --border: #E5E6EB;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-dark);
    background-color: #FAFAFA;
    line-height: 1.6;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-medium);
    position: relative;
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary);
    border-radius: 3px;
}

/* 轮播图样式 */
.carousel {
    position: relative;
    height: 500px;
    overflow: hidden;
    border-radius: var(--radius);
    margin: 20px 0;
}

.carousel-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.carousel-item.active {
    opacity: 1;
    z-index: 1;
}

.carousel-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: var(--white);
    padding: 30px;
    z-index: 2;
}

.carousel-caption h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.carousel-control {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.3);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 3;
    transition: var(--transition);
}

.carousel-control:hover {
    background-color: rgba(255, 255, 255, 0.5);
}

.carousel-prev {
    left: 20px;
}

.carousel-next {
    right: 20px;
}

/* 通用模块样式 */
.section {
    margin: 50px 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    position: relative;
    padding-left: 10px;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--primary);
    border-radius: 4px;
}

.view-more {
    color: var(--primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
}

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

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.card-img {
    height: 200px;
}

.card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-content {
    padding: 20px;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.card-excerpt {
    color: var(--text-medium);
    font-size: 0.9rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 首页布局 - 网格样式 */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* 列表样式 */
.list-item {
    display: flex;
    gap: 20px;
    padding: 15px 0;
    border-bottom: 1px solid var(--border);
}

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

.list-item-img {
    flex: 0 0 160px;
    height: 120px;
    border-radius: var(--radius);
    overflow: hidden;
}

.list-item-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.list-item-content {
    flex: 1;
}

.list-item-title {
    font-weight: 600;
    margin-bottom: 8px;
    transition: var(--transition);
}

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

.list-item-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 5px;
}

.list-item-excerpt {
    color: var(--text-medium);
    font-size: 0.9rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 数字列表样式 */
.number-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.number-list-item {
    display: flex;
    gap: 15px;
    align-items: center;
}

.number-list-rank {
    flex: 0 0 30px;
    height: 30px;
    background-color: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.number-list-item:nth-child(1) .number-list-rank,
.number-list-item:nth-child(2) .number-list-rank,
.number-list-item:nth-child(3) .number-list-rank {
    background-color: var(--secondary);
}

.number-list-content {
    flex: 1;
}

.number-list-title {
    font-weight: 500;
    transition: var(--transition);
}

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

/* 详情页样式 */
.detail-header {
    text-align: center;
    margin: 30px 0;
}

.detail-title {
    font-size: 2rem;
    margin-bottom: 20px;
    line-height: 1.3;
}

.detail-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.detail-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px;
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    font-size: 1.05rem;
    line-height: 1.8;
}

.detail-content p {
    margin-bottom: 20px;
}

.detail-content img {
    margin: 30px auto;
    max-width: 100%;
    border-radius: var(--radius);
}

/* 相关文章和最新文章 */
.sidebar-section {
    background-color: var(--white);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.sidebar-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}

.related-list, .latest-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.related-item, .latest-item {
    display: flex;
    gap: 15px;
}

.related-img, .latest-img {
    flex: 0 0 80px;
    height: 60px;
    border-radius: var(--radius);
    overflow: hidden;
}

.related-img img, .latest-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.related-content, .latest-content {
    flex: 1;
}

.related-title, .latest-title {
    font-size: 0.9rem;
    font-weight: 500;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: var(--transition);
}

.related-title:hover, .latest-title:hover {
    color: var(--primary);
}

/* 分页和导航 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 40px 0;
}

.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border);
    font-weight: 500;
    transition: var(--transition);
}

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

.page-prev, .page-next {
    width: auto;
    padding: 0 15px;
    border-radius: 20px;
}

/* 详情页导航 */
.detail-nav {
    display: flex;
    justify-content: space-between;
    margin: 30px 0;
    padding: 20px;
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.prev-article, .next-article {
    display: flex;
    align-items: center;
    gap: 10px;
}

.prev-article {
    flex: 0 0 48%;
}

.next-article {
    flex: 0 0 48%;
    justify-content: flex-end;
}

.nav-arrow {
    color: var(--primary);
    font-size: 1.2rem;
}

.nav-title {
    font-weight: 500;
    font-size: 0.95rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 页脚样式 */
.footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding: 50px 0 20px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.footer-column h3 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background-color: var(--secondary);
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .carousel {
        height: 350px;
    }

    .grid-3, .grid-2 {
        grid-template-columns: 1fr;
    }

    .list-item {
        flex-direction: column;
    }

    .list-item-img {
        flex: 0 0 200px;
        width: 100%;
    }

    .detail-title {
        font-size: 1.5rem;
    }

    .detail-nav {
        flex-direction: column;
        gap: 20px;
    }

    .prev-article, .next-article {
        flex: 0 0 100%;
    }
}

@media (max-width: 576px) {
    .carousel {
        height: 250px;
    }

    .carousel-caption h3 {
        font-size: 1.2rem;
    }

    .nav-links {
        display: none;
    }

    .grid-4 {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}