:root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color-1: #e74c3c;
            --accent-color-2: #1abc9c;
            --light-bg: #f8f9fa;
            --dark-bg: #212529;
            --text-color: #333;
            --light-text: #f8f9fa;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Roboto', sans-serif;
            color: var(--text-color);
            background-color: #f5f7fa;
            line-height: 1.6;
        }
        
        h1, h2, h3, h4, h5 {
            font-family: 'Merriweather', serif;
            font-weight: 700;
        }
        
        /* 导航条样式 */
        #ai_auto_navbar {
            background-color: var(--primary-color);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .ai_auto_navbar-brand {
            color: white;
            font-size: 1.5rem;
            font-weight: 700;
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        
        .ai_auto_navbar-brand i {
            margin-right: 10px;
            color: var(--accent-color-2);
        }
        
        .ai_auto_nav-link {
            color: rgba(255, 255, 255, 0.85) !important;
            font-weight: 500;
            margin: 0 0.5rem;
            padding: 0.5rem 1rem !important;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        
        .ai_auto_nav-link:hover,
        .ai_auto_nav-link.active {
            color: white !important;
            background-color: rgba(255, 255, 255, 0.1);
        }
        
        .ai_auto_search-form {
            display: flex;
            margin-left: 1rem;
        }
        
        .ai_auto_search-input {
            border: none;
            border-radius: 4px 0 0 4px;
            padding: 0.5rem 1rem;
            width: 220px;
        }
        
        .ai_auto_search-btn {
            background-color: var(--accent-color-2);
            color: white;
            border: none;
            border-radius: 0 4px 4px 0;
            padding: 0.5rem 1rem;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        .ai_auto_search-btn:hover {
            background-color: #16a085;
        }
        
        /* Banner区域样式 */
        #ai_auto_banner {
            background: linear-gradient(rgba(44, 62, 80, 0.85), rgba(44, 62, 80, 0.9)), url('https://images.unsplash.com/photo-1581578029520-0d2411e811a0?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 6rem 0;
            text-align: center;
        }
        
        .ai_auto_banner-title {
            font-size: 3rem;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }
        
        .ai_auto_banner-desc {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 2.5rem;
            opacity: 0.9;
        }
        
        .ai_auto_banner-search {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
        }
        
        .ai_auto_banner-search-input {
            flex: 1;
            padding: 0.8rem 1.5rem;
            border: none;
            border-radius: 50px 0 0 50px;
            font-size: 1.1rem;
        }
        
        .ai_auto_banner-search-btn {
            background-color: var(--accent-color-1);
            color: white;
            border: none;
            border-radius: 0 50px 50px 0;
            padding: 0.8rem 2rem;
            font-size: 1.1rem;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        .ai_auto_banner-search-btn:hover {
            background-color: #c0392b;
        }
        
        /* 文章板块通用样式 */
        #ai_auto_home-artice {
            padding: 4rem 0;
        }
        
        .ai_auto_section-title {
            position: relative;
            font-size: 2rem;
            margin-bottom: 2.5rem;
            padding-bottom: 1rem;
            color: var(--primary-color);
            text-align: center;
        }
        
        .ai_auto_section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-color-1);
        }
        
        .ai_auto_article-card {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        
        .ai_auto_article-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
        }
        
        .ai_auto_article-img-container {
            width: 100%;
            height: 200px;
            overflow: hidden;
        }
        
        .ai_auto_article-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .ai_auto_article-card:hover .ai_auto_article-img {
            transform: scale(1.05);
        }
        
        .ai_auto_article-content {
            padding: 1.5rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        
        .ai_auto_article-title {
            font-size: 1.3rem;
            margin-bottom: 0.8rem;
            color: var(--primary-color);
        }
        
        .ai_auto_article-title a {
            color: inherit;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .ai_auto_article-title a:hover {
            color: var(--accent-color-1);
        }
        
        .ai_auto_article-desc {
            color: #555;
            margin-bottom: 1rem;
            flex-grow: 1;
        }
        
        .ai_auto_article-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            color: #777;
            margin-bottom: 1rem;
        }
        
        .ai_auto_article-author {
            display: flex;
            align-items: center;
        }
        
        .ai_auto_article-author i {
            margin-right: 5px;
            color: var(--secondary-color);
        }
        
        .ai_auto_article-date {
            display: flex;
            align-items: center;
        }
        
        .ai_auto_article-date i {
            margin-right: 5px;
            color: var(--accent-color-1);
        }
        
        .ai_auto_article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: auto;
        }
        
        .ai_auto_article-tag {
            background-color: var(--light-bg);
            color: var(--secondary-color);
            font-size: 0.75rem;
            padding: 0.25rem 0.75rem;
            border-radius: 30px;
            text-decoration: none;
            transition: all 0.3s;
        }
        
        .ai_auto_article-tag:hover {
            background-color: var(--secondary-color);
            color: white;
        }
        
        /* 特色文章 - 单列时间线卡片列表模式 */
        #ai_auto_feature-article {
            margin-bottom: 4rem;
        }
        
        .ai_auto_timeline-card {
            position: relative;
            margin-bottom: 2rem;
            border-left: 2px solid var(--secondary-color);
            padding-left: 2rem;
            padding-bottom: 2rem;
        }
        
        .ai_auto_timeline-card::before {
            content: '';
            position: absolute;
            left: -9px;
            top: 0;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--secondary-color);
            z-index: 1;
        }
        
        .ai_auto_timeline-date {
            background: var(--accent-color-1);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-weight: 500;
            margin-bottom: 1.5rem;
            display: inline-block;
        }
        
        .ai_auto_timeline-content {
            display: flex;
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        
        .ai_auto_timeline-img {
            width: 320px;
            height: 250px;
            object-fit: cover;
        }
        
        .ai_auto_timeline-text {
            width: 65%;
            padding: 1.5rem;
            display: flex;
            flex-direction: column;
        }
        
        /* 最近文章 - 卡片瀑布布局 */
        #ai_auto_last-article {
            margin-bottom: 4rem;
        }
        
        .ai_auto_masonry-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        /* 推荐文章 - 图文背景融合卡 */
        #ai_auto_recommend-article {
            margin-bottom: 4rem;
        }
        
        .ai_auto_overlay-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        .ai_auto_overlay-card {
            position: relative;
            height: 300px;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .ai_auto_overlay-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .ai_auto_overlay-content {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(44, 62, 80, 0.85);
            color: white;
            padding: 1.5rem;
            transform: translateY(100%);
            transition: transform 0.4s ease;
        }
        
        .ai_auto_overlay-card:hover .ai_auto_overlay-content {
            transform: translateY(0);
        }
        
        .ai_auto_overlay-card:hover .ai_auto_overlay-img {
            transform: scale(1.05);
        }
        
        .ai_auto_overlay-title {
            font-size: 1.3rem;
            margin-bottom: 0.8rem;
        }
        
        .ai_auto_overlay-title a {
            color: white;
            text-decoration: none;
        }
        
        .ai_auto_overlay-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.9rem;
            opacity: 0.8;
            margin-bottom: 1rem;
        }
        
        .ai_auto_overlay-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        
        .ai_auto_overlay-tag {
            background-color: var(--accent-color-2);
            color: white;
            font-size: 0.75rem;
            padding: 0.25rem 0.75rem;
            border-radius: 30px;
            text-decoration: none;
        }
        
        /* 订阅板块 */
        #ai_auto_subscribe {
            background: linear-gradient(to right, var(--primary-color), #1a2530);
            color: white;
            padding: 5rem 0;
            text-align: center;
        }
        
        .ai_auto_subscribe-title {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        
        .ai_auto_subscribe-desc {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 2.5rem;
            opacity: 0.9;
        }
        
        .ai_auto_subscribe-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
        }
        
        .ai_auto_subscribe-input {
            flex: 1;
            padding: 0.8rem 1.5rem;
            border: none;
            border-radius: 50px 0 0 50px;
            font-size: 1.1rem;
        }
        
        .ai_auto_subscribe-btn {
            background-color: var(--accent-color-2);
            color: white;
            border: none;
            border-radius: 0 50px 50px 0;
            padding: 0.8rem 2rem;
            font-size: 1.1rem;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        .ai_auto_subscribe-btn:hover {
            background-color: #16a085;
        }
        
        /* Footer样式 */
        #ai_auto_footer {
            background-color: var(--dark-bg);
            color: rgba(255, 255, 255, 0.7);
            padding-top: 4rem;
        }
        
        .ai_auto_footer-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        
        .ai_auto_footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--accent-color-1);
        }
        
        .ai_auto_footer-links {
            list-style: none;
            padding: 0;
        }
        
        .ai_auto_footer-links li {
            margin-bottom: 0.8rem;
        }
        
        .ai_auto_footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .ai_auto_footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        
        .ai_auto_footer-contact li {
            display: flex;
            align-items: flex-start;
            margin-bottom: 1rem;
        }
        
        .ai_auto_footer-contact i {
            color: var(--accent-color-2);
            margin-right: 10px;
            margin-top: 5px;
        }
        
        .ai_auto_footer-bottom {
            background-color: rgba(0, 0, 0, 0.2);
            padding: 1.5rem 0;
            margin-top: 3rem;
            text-align: center;
        }
        
        /* 响应式调整 */
        @media (max-width: 992px) {
            .ai_auto_timeline-content {
                flex-direction: column;
            }
            
            .ai_auto_timeline-img,
            .ai_auto_timeline-text {
                width: 100%;
            }
            
            .ai_auto_timeline-img {
                height: 200px;
            }
        }
        
        @media (max-width: 768px) {
            .ai_auto_banner-title {
                font-size: 2.5rem;
            }
            
            .ai_auto_banner-search,
            .ai_auto_subscribe-form {
                flex-direction: column;
            }
            
            .ai_auto_banner-search-input,
            .ai_auto_banner-search-btn,
            .ai_auto_subscribe-input,
            .ai_auto_subscribe-btn {
                border-radius: 50px;
                margin-bottom: 10px;
                width: 100%;
            }
            
            .ai_auto_footer .row > div {
                margin-bottom: 2rem;
            }
        }