/* 
* 主样式文件
* 专业教程与资源平台
*/

/* 基础样式 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2980b9;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-text: #777;
    --bg-color: #fff;
    --light-bg: #f8f9fa;
    --dark-bg: #343a40;
    --border-color: #e1e1e1;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --info-color: #3498db;
    --danger-color: #e74c3c;
    --box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --border-radius: 4px;
    --container-width: 1200px;
}



body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

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

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

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

.container {
    /* width: 100%; */
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 15px;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2.2rem;
    font-weight: 600;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
}

.btn {
    display: inline-block;
    padding: 10px 25px;
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn-sm {
    padding: 6px 15px;
    font-size: 0.9rem;
}

.view-all-container {
    text-align: center;
    margin-top: 30px;
}

/* 头部样式 */
.site-header {
    background-color: white;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

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

.breadcrumb-nav a {
    color: white;
    text-decoration: none;
}

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

.main-nav .menu {
    display: flex;
}

.main-nav .menu > li {
    position: relative;
    margin-right: 20px;
}

.main-nav .menu > li > a {
    padding: 10px 15px;
    display: block;
    color: var(--text-color);
    font-weight: 500;
}

.main-nav .menu > li.active > a,
.main-nav .menu > li > a:hover {
    color: var(--primary-color);
}

.main-nav .submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: white;
    box-shadow: var(--box-shadow);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 100;
    border-radius: var(--border-radius);
}

.main-nav .submenu-level2 {
    position: absolute;
    left: 100%;
    top: 0;
    background-color: white;
    box-shadow: var(--box-shadow);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(10px);
    transition: var(--transition);
    z-index: 100;
    border-radius: var(--border-radius);
}

.main-nav .has-submenu:hover > .submenu,
.main-nav .has-submenu:hover > .submenu-level2 {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) translateX(0);
}

.main-nav .submenu li,
.main-nav .submenu-level2 li {
    position: relative;
}

.main-nav .submenu a,
.main-nav .submenu-level2 a {
    padding: 10px 15px;
    display: block;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
}

.main-nav .submenu a:hover,
.main-nav .submenu-level2 a:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

.search-box {
    position: relative;
}

.search-box input {
    padding: 8px 15px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    width: 200px;
    transition: var(--transition);
}

.search-box input:focus {
    width: 250px;
    outline: none;
    border-color: var(--primary-color);
}

.search-box button {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--light-text);
    cursor: pointer;
}

/* 轮播图样式 */
.hero-slider {
    position: relative;
    height: 500px;
    overflow: hidden;
}

.slider-container {
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1s ease;
    display: flex;
    align-items: center;
}

.slide.active {
    opacity: 1;
    z-index: 1;
}

.slide-content {
    max-width: 600px;
    margin-left: 10%;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.slide-content h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.slide-content p {
    font-size: 1.2rem;
    margin-bottom: 25px;
}

.slider-controls {
    position: absolute;
    bottom: 30px;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.prev-slide, .next-slide {
    background: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    margin: 0 10px;
    transition: var(--transition);
}

.prev-slide:hover, .next-slide:hover {
    background: rgba(0, 0, 0, 0.8);
}

.slider-dots {
    display: flex;
    margin: 0 20px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    margin: 0 5px;
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: white;
}

/* 特色内容区域 */
.features {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}

/* 最新教程区域 */
.latest-tutorials {
    padding: 10px 0;
}

.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

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

.tutorial-card:hover {
    transform: translateY(-5px);
}

.tutorial-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.tutorial-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.tutorial-card:hover .tutorial-image img {
    transform: scale(1.05);
}

.tutorial-category {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--primary-color);
    color: white;
    padding: 5px 10px;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    font-weight: 500;
}

.tutorial-content {
    padding: 20px;
}

.tutorial-content h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.tutorial-meta {
    display: flex;
    justify-content: space-between;
    color: var(--light-text);
    font-size: 0.85rem;
    margin-bottom: 15px;
}

.tutorial-meta span {
    display: flex;
    align-items: center;
}

.tutorial-meta i {
    margin-right: 5px;
}

.read-more {
    display: inline-block;
    margin-top: 15px;
    color: var(--primary-color);
    font-weight: 500;
}

.read-more:hover {
    color: var(--secondary-color);
}

/* 热门资料区域 */
.popular-materials {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.tabs {
    margin-bottom: 30px;
}

.tab-header {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
}

.tab {
    padding: 10px 25px;
    cursor: pointer;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.material-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

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

.material-card:hover {
    transform: translateY(-5px);
}

.material-image {
    width: 100%;
    overflow: hidden;
}

.material-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.material-card:hover .material-image img {
    transform: scale(1.05);
}

.material-content {
    width: 90%;  padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  
}

.material-content h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.material-content p {
    font-size: 0.9rem;
    color: var(--light-text);
    margin-bottom: 15px;
}

/* 热门工具区域 */
.popular-tools {
    padding: 80px 0;
}

.tools-showcase {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.tool-category h3 {
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
    font-size: 1.5rem;
}

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

.tool-item {
    display: flex;
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.tool-item:hover {
    transform: translateY(-5px);
}

.tool-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: white;
}

.tool-icon img {
    max-width: 60px;
    max-height: 60px;
}

.tool-info {
    flex: 1;
    padding: 15px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.tool-info h4 {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

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

/* 用户反馈区域 */
.testimonials {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.testimonial-slider {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.testimonial-slide {
    display: none;
}

.testimonial-slide.active {
    display: block;
}

.testimonial-content {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    position: relative;
}

.quote-icon {
    font-size: 2rem;
    color: var(--primary-color);
    opacity: 0.2;
    margin-bottom: 15px;
}

.testimonial-content p {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.testimonial-author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    margin-right: 15px;
    object-fit: cover;
}

.author-info h4 {
    margin-bottom: 5px;
}

.author-info p {
    color: var(--light-text);
    margin: 0;
    font-size: 0.9rem;
}

.testimonial-controls {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

.testimonial-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.2);
    margin: 0 5px;
    cursor: pointer;
    transition: var(--transition);
}

.testimonial-dot.active {
    background-color: var(--primary-color);
}

/* 订阅区域 */
.newsletter {
    padding: 60px 0;
    background-color: var(--primary-color);
    color: white;
}

.newsletter-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.newsletter-content h2 {
    margin-bottom: 15px;
    font-size: 2rem;
}

.newsletter-content p {
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.newsletter-form {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
}

.newsletter-form input {
    flex: 1;
    padding: 12px 15px;
    border: none;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
}

.newsletter-form button {
    padding: 12px 25px;
    background-color: var(--dark-bg);
    color: white;
    border: none;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    cursor: pointer;
    transition: var(--transition);
}

.newsletter-form button:hover {
    background-color: black;
}

/* 页脚区域 */
.site-footer {
    background-color: var(--dark-bg);
    color: white;
    padding: 60px 0 0;
}

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

.footer-column h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
    position: relative;
    padding-bottom: 10px;
}

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

.footer-column p {
    color: #aaa;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul li a {
    color: #aaa;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: white;
    padding-left: 5px;
}

.contact-info li {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    color: #aaa;
}

.contact-info li i {
    margin-right: 10px;
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #aaa;
    font-size: 0.9rem;
}
 /* 资料库页面特定样式 */
        .material-hero {
            background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('images/material-hero.jpg');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 80px 0;
            text-align: center;
        }
        
        .material-hero h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
        }
        
        .material-hero p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 30px;
        }
        
        .material-tabs {
            background-color: var(--light-bg);
            padding: 20px 0;
            margin-bottom: 40px;
        }
        
        .tab-container {
            display: flex;
            justify-content: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        
        .tab-button {
            padding: 12px 25px;
            background-color: white;
            border-radius: var(--border-radius);
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid var(--border-color);
            font-weight: 500;
        }
        
        .tab-button.active {
            background-color: var(--primary-color);
            color: #fff !important;
            border-color: var(--primary-color);
        }
        .tab-button.active a {
          
            color: #fff !important;
          
        }
        .tab-button:hover:not(.active) {
            border-color: #fff;
        }
        
        .material-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-bottom: 40px;
        }
        
        .material-card {
            background-color: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        
        .material-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .material-image {
            position: relative;
            height: 180px;
            overflow: hidden;
        }
        
        .material-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .material-card:hover .material-image img {
            transform: scale(1.05);
        }
        
        .material-platform {
            position: absolute;
            top: 15px;
            left: 15px;
            background-color: var(--primary-color);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 500;
        }
        
        .material-content {
            padding: 15px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        
        .material-content h3 {
            margin-top: 0;
            margin-bottom: 8px;
            font-size: 1.1rem;
        }
        
        .material-content h3 a {
            color: var(--text-color);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .material-content h3 a:hover {
            color: var(--primary-color);
        }
        
        .material-meta {
            display: flex;
            justify-content: space-between;
            margin-bottom: 12px;
            color: var(--text-light);
            font-size: 0.85rem;
        }
        
        .material-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        
        .material-content p {
            margin-bottom: 12px;
            color: var(--text-light);
            font-size: 0.9rem;
            line-height: 1.4;
            flex-grow: 1;
        }
        
        .material-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: 12px;
            margin-bottom: 12px;
        }
        
        .material-tag {
            background-color: var(--light-bg);
            padding: 3px 8px;
            border-radius: 20px;
            font-size: 0.75rem;
            color: var(--text-light);
        }
        
        .download-btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: 6px 12px;
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            text-align: center;
            margin-top: auto;
            
        }
        
        .download-btn:hover {
            background-color: var(--primary-dark);
        }
        
        .pagination {
            display: flex;
            justify-content: center;
            margin-top: 40px;
            margin-bottom: 60px;
        }
        
        .pagination a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            margin: 0 5px;
            border-radius: 50%;
            background-color: white;
            color: var(--text-color);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        
        .pagination a:hover,
        .pagination a.active {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .pagination .prev,
        .pagination .next {
            width: auto;
            padding: 0 15px;
            border-radius: 20px;
        }
        
        .pagination .prev i,
        .pagination .next i {
            margin: 0 5px;
        }
        
        @media (max-width: 1200px) {
            .material-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        
        @media (max-width: 991px) {
            .material-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 767px) {
            .material-grid {
                grid-template-columns: 1fr;
            }
            
            .material-hero h1 {
                font-size: 2.2rem;
            }
        }
         /* 详情页面特定样式 */
        .material-detail-hero {
            background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('images/material1.jpg');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 80px 0;
            text-align: center;
        }
        
        .material-detail-hero h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
        }
        
        .material-detail-hero .platform-badge {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 1rem;
            font-weight: 500;
            margin-bottom: 20px;
        }
        
        .material-detail-meta {
            display: flex;
            justify-content: center;
            gap: 30px;
            margin-bottom: 30px;
            color: rgba(255, 255, 255, 0.8);
        }
        
        .material-detail-meta span {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .material-detail-meta-xq {
            display: flex;
            justify-content: left;
            gap: 30px;
            margin-bottom: 30px;
            color:var(--text-color);
            text-align: left;
        }
        
        .material-detail-meta-xq span {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .material-detail-content {
            padding: 60px 0;
        }
        
        .material-detail-container {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 40px;
            align-items: start;
        }
        
        .material-main-content {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 30px;
        }
        
        .material-main-content h2 {
            margin-top: 0;
            margin-bottom: 20px;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        
        .material-main-content p {
            margin-bottom: 20px;
            line-height: 1.7;
            color: var(--text-color);
        }
        
        .material-main-content img {
            width: 100%;
            border-radius: var(--border-radius);
            margin: 20px 0;
        }
        
        .material-main-content ul {
            margin-bottom: 20px;
            padding-left: 20px;
        }
        
        .material-main-content ul li {
            margin-bottom: 10px;
            line-height: 1.6;
        }
        
        .material-main-content .highlight-box {
            background-color: var(--light-bg);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 30px 0;
            border-left: 4px solid var(--primary-color);
        }
        
        .material-main-content .highlight-box h3 {
            margin-top: 0;
            color: var(--primary-color);
        }
        
        .material-sidebar {
            position: sticky;
            top: 100px;
        }
        
        .sidebar-box {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
            margin-bottom: 30px;
        }
        
        .sidebar-box h3 {
            margin-top: 0;
            margin-bottom: 20px;
            font-size: 1.3rem;
            color: var(--primary-color);
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 10px;
        }
        
        .download-box {
            text-align: center;
        }
        
        .download-box .file-info {
            margin-bottom: 20px;
        }
        
        .download-box .file-info p {
            margin: 5px 0;
            color: var(--text-light);
        }
        
        .download-box .big-download-btn {
            display: block;
            background-color: var(--primary-color);
            color: white;
            padding: 15px 20px;
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: 500;
            font-size: 1.1rem;
            transition: var(--transition);
            margin-bottom: 15px;
        }
        
        .download-box .big-download-btn:hover {
            background-color: var(--secondary-color);
        }
        
        .related-materials {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .related-materials li {
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .related-materials li:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }
        
        .related-materials a {
            display: flex;
            align-items: center;
            gap: 15px;
            color: var(--text-color);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .related-materials a:hover {
            color: var(--primary-color);
        }
        
        .related-materials img {
            width: 70px;
            height: 70px;
            object-fit: cover;
            border-radius: var(--border-radius);
        }
        
        .related-materials .related-title {
            font-weight: 500;
        }
        
        .material-tags-box .material-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        
        @media (max-width: 991px) {
            .material-detail-container {
                grid-template-columns: 1fr;
            }
            
            .material-sidebar {
                position: static;
            }
        }
        
        @media (max-width: 767px) {
            .material-detail-hero h1 {
                font-size: 2.2rem;
            }
            
            .material-detail-meta {
                flex-direction: column;
                gap: 10px;
            }
        }