:root {
            --primary-color: #2c6bc0;
            --secondary-1: #4CAF50;
            --secondary-2: #9C27B0;
            --secondary-3: #FF9800;
            --light-bg: #f8f9fa;
            --dark-bg: #1a2639;
            --text-color: #333;
            --text-light: #f8f9fa;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Open Sans', sans-serif;
            color: var(--text-color);
            background-color: var(--light-bg);
            overflow-x: hidden;
        }
        
        h1, h2, h3, h4, h5, h6 {
            font-family: 'Montserrat', sans-serif;
            font-weight: 700;
        }
        
        /* 导航条样式 */
        #ai_auto_navbar {
            background-color: var(--dark-bg);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .ai_auto_navbar-brand {
            color: var(--text-light);
            font-size: 1.8rem;
            font-weight: 700;
            display: flex;
            align-items: center;
        }
        
        .ai_auto_navbar-brand i {
            color: var(--secondary-1);
            margin-right: 10px;
        }
        
        .ai_auto_nav-link {
            color: rgba(255,255,255,0.8) !important;
            font-weight: 600;
            padding: 0.5rem 1rem !important;
            margin: 0 0.25rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        
        .ai_auto_nav-link:hover {
            color: var(--text-light) !important;
            background-color: rgba(255,255,255,0.1);
        }
        
        .ai_auto_search-form {
            display: flex;
            width: 100%;
        }
        
        .ai_auto_search-input {
            background: rgba(255,255,255,0.1);
            border: none;
            border-radius: 30px 0 0 30px;
            padding: 0.6rem 1.5rem;
            color: white;
            transition: all 0.3s;
        }
        
        .ai_auto_search-input::placeholder {
            color: rgba(255,255,255,0.6);
        }
        
        .ai_auto_search-input:focus {
            background: rgba(255,255,255,0.2);
            outline: none;
            box-shadow: none;
        }
        
        .ai_auto_search-btn {
            border-radius: 0 30px 30px 0;
            border: none;
            background: var(--primary-color);
            color: white;
            padding: 0 1.5rem;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .ai_auto_search-btn:hover {
            background: #1a4d9c;
        }
        
        /* Banner 样式 */
        #ai_auto_banner {
            background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-color) 100%);
            padding: 6rem 0;
            position: relative;
            overflow: hidden;
        }
        
        .ai_auto_banner-inner {
            position: relative;
            z-index: 2;
            color: white;
            text-align: center;
        }
        
        .ai_auto_banner-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        
        .ai_auto_banner-info {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 3rem;
            opacity: 0.9;
        }
        
        .ai_auto_banner-search {
            max-width: 700px;
            margin: 0 auto;
        }
        
        .ai_auto_banner-form {
            display: flex;
            height: 60px;
        }
        
        .ai_auto_banner-input {
            flex: 1;
            border: none;
            border-radius: 30px 0 0 30px;
            padding: 0 1.8rem;
            font-size: 1.1rem;
        }
        
        .ai_auto_banner-btn {
            background: var(--secondary-1);
            color: white;
            border: none;
            border-radius: 0 30px 30px 0;
            padding: 0 2rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .ai_auto_banner-btn:hover {
            background: #3d8b40;
        }
        
        /* 分子背景元素 */
        .ai_auto_molecule {
            position: absolute;
            width: 120px;
            height: 120px;
            background: rgba(255,255,255,0.05);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1;
            animation: float 8s infinite ease-in-out;
        }
        
        .ai_auto_molecule::before, .ai_auto_molecule::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: rgba(255,255,255,0.15);
        }
        
        .ai_auto_molecule::before {
            top: -40px;
            left: 50%;
            transform: translateX(-50%);
        }
        
        .ai_auto_molecule::after {
            bottom: -40px;
            left: 50%;
            transform: translateX(-50%);
        }
        
        .ai_auto_molecule:nth-child(1) {
            top: 20%;
            left: 10%;
            animation-delay: 0s;
        }
        
        .ai_auto_molecule:nth-child(2) {
            top: 40%;
            right: 15%;
            animation-delay: -2s;
        }
        
        .ai_auto_molecule:nth-child(3) {
            bottom: 20%;
            left: 20%;
            animation-delay: -4s;
        }
        
        @keyframes float {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(5deg); }
        }
        
        /* 文章展示区域 */
        #ai_auto_home-artice {
            padding: 5rem 0;
        }
        
        .ai_auto_section-title {
            position: relative;
            margin-bottom: 3rem;
            text-align: center;
            font-size: 2.5rem;
            color: var(--dark-bg);
        }
        
        .ai_auto_section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        
        /* 特色文章 - 杂志式布局 */
        #ai_auto_feature-article {
            margin-bottom: 5rem;
        }
        
        .ai_auto_feature-main {
            height: 500px;
            border-radius: 10px;
            overflow: hidden;
            position: relative;
            margin-bottom: 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }
        
        .ai_auto_feature-main:hover {
            transform: translateY(-5px);
        }
        
        .ai_auto_feature-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .ai_auto_feature-content {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 2rem;
            background: linear-gradient(transparent, rgba(0,0,0,0.8));
            color: white;
        }
        
        .ai_auto_feature-title {
            font-size: 2rem;
            margin-bottom: 1rem;
        }
        
        .ai_auto_feature-desc {
            font-size: 1.1rem;
            margin-bottom: 1.5rem;
            opacity: 0.9;
        }
        
        .ai_auto_feature-meta {
            display: flex;
            align-items: center;
            font-size: 0.9rem;
        }
        
        .ai_auto_feature-author, .ai_auto_feature-date {
            display: flex;
            align-items: center;
            margin-right: 1.5rem;
        }
        
        .ai_auto_feature-author i, .ai_auto_feature-date i {
            margin-right: 0.5rem;
            color: var(--secondary-3);
        }
        
        .ai_auto_feature-side {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        
        .ai_auto_feature-side-item {
            display: flex;
            border-bottom: 1px solid #eee;
            padding-bottom: 20px;
        }
        
        .ai_auto_feature-side-img {
            width: 120px;
            height: 100px;
            object-fit: cover;
            border-radius: 6px;
            margin-right: 20px;
            flex-shrink: 0;
        }
        
        .ai_auto_feature-side-content {
            flex: 1;
        }
        
        .ai_auto_feature-side-title {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
        }
        
        .ai_auto_feature-side-meta {
            font-size: 0.85rem;
            color: #666;
            display: flex;
        }
        
        .ai_auto_feature-side-author {
            margin-right: 1rem;
        }
        
        /* 最近文章 - 瀑布流布局 */
        #ai_auto_last-article {
            margin-bottom: 5rem;
        }
        
        .ai_auto_last-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .ai_auto_last-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }
        
        .ai_auto_last-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        .ai_auto_last-img-container {
            height: 200px;
            overflow: hidden;
        }
        
        .ai_auto_last-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .ai_auto_last-card:hover .ai_auto_last-img {
            transform: scale(1.05);
        }
        
        .ai_auto_last-content {
            padding: 1.5rem;
        }
        
        .ai_auto_last-title {
            font-size: 1.3rem;
            margin-bottom: 0.75rem;
        }
        
        .ai_auto_last-desc {
            color: #666;
            margin-bottom: 1rem;
            font-size: 0.95rem;
        }
        
        .ai_auto_last-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            color: #777;
        }
        
        .ai_auto_last-tags {
            display: flex;
            flex-wrap: wrap;
            margin-top: 1rem;
        }
        
        .ai_auto_last-tag {
            background: rgba(44, 107, 192, 0.1);
            color: var(--primary-color);
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.8rem;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
            transition: all 0.3s;
        }
        
        .ai_auto_last-tag:hover {
            background: var(--primary-color);
            color: white;
        }
        
        /* 推荐文章 - 图文背景融合卡 */
        #ai_auto_recommend-article {
            margin-bottom: 5rem;
        }
        
        .ai_auto_recommend-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 25px;
        }
        
        .ai_auto_recommend-card {
            height: 300px;
            border-radius: 10px;
            overflow: hidden;
            position: relative;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .ai_auto_recommend-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .ai_auto_recommend-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.3);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 2rem;
            opacity: 1;
            transition: all 0.4s ease;
        }
        
        .ai_auto_recommend-content {
            transform: translateY(20px);
            transition: transform 0.4s ease;
        }
        
        .ai_auto_recommend-title {
            color: white;
            font-size: 1.4rem;
            margin-bottom: 1rem;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        
        .ai_auto_recommend-meta {
            color: rgba(255,255,255,0.8);
            font-size: 0.9rem;
            display: flex;
        }
        
        .ai_auto_recommend-author {
            margin-right: 1.5rem;
        }
        
        .ai_auto_recommend-card:hover .ai_auto_recommend-overlay {
            background: rgba(26, 38, 57, 0.85);
        }
        
        .ai_auto_recommend-card:hover .ai_auto_recommend-content {
            transform: translateY(0);
        }
        
        .ai_auto_recommend-card:hover .ai_auto_recommend-img {
            transform: scale(1.1);
        }
        
        /* 订阅板块 */
        #ai_auto_subscribe {
            background: linear-gradient(135deg, var(--secondary-2) 0%, var(--primary-color) 100%);
            padding: 5rem 0;
            color: white;
            text-align: center;
        }
        
        .ai_auto_subscribe-title {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        
        .ai_auto_subscribe-info {
            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;
            height: 60px;
        }
        
        .ai_auto_subscribe-input {
            flex: 1;
            border: none;
            border-radius: 30px 0 0 30px;
            padding: 0 1.8rem;
            font-size: 1.1rem;
        }
        
        .ai_auto_subscribe-btn {
            background: var(--secondary-3);
            color: white;
            border: none;
            border-radius: 0 30px 30px 0;
            padding: 0 2rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .ai_auto_subscribe-btn:hover {
            background: #e68a00;
        }
        
        /* Footer 样式 */
        #ai_auto_footer {
            background: var(--dark-bg);
            color: rgba(255,255,255,0.8);
            padding-top: 4rem;
        }
        
        .ai_auto_footer-title {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.75rem;
        }
        
        .ai_auto_footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--primary-color);
        }
        
        .ai_auto_footer-desc {
            margin-bottom: 1.5rem;
            line-height: 1.7;
        }
        
        .ai_auto_footer-list {
            list-style: none;
            padding: 0;
        }
        
        .ai_auto_footer-list li {
            margin-bottom: 0.8rem;
        }
        
        .ai_auto_footer-list a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: all 0.3s;
            display: flex;
            align-items: center;
        }
        
        .ai_auto_footer-list a i {
            margin-right: 10px;
            width: 20px;
            text-align: center;
        }
        
        .ai_auto_footer-list a:hover {
            color: white;
            padding-left: 5px;
        }
        
        .ai_auto_copyright {
            background: rgba(0,0,0,0.2);
            text-align: center;
            padding: 1.5rem 0;
            margin-top: 4rem;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.6);
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .ai_auto_feature-main {
                height: 400px;
            }
            
            .ai_auto_banner-title {
                font-size: 2.8rem;
            }
        }
        
        @media (max-width: 768px) {
            .ai_auto_banner-title {
                font-size: 2.3rem;
            }
            
            .ai_auto_feature-main {
                height: 350px;
                margin-bottom: 20px;
            }
            
            .ai_auto_section-title {
                font-size: 2rem;
            }
            
            .ai_auto_subscribe-title {
                font-size: 2rem;
            }
            
            .ai_auto_footer .row > div {
                margin-bottom: 2.5rem;
            }
        }
        
        @media (max-width: 576px) {
            .ai_auto_banner {
                padding: 4rem 0;
            }
            
            .ai_auto_banner-title {
                font-size: 2rem;
            }
            
            .ai_auto_banner-form, .ai_auto_subscribe-form {
                flex-direction: column;
                height: auto;
            }
            
            .ai_auto_banner-input, .ai_auto_banner-btn, 
            .ai_auto_subscribe-input, .ai_auto_subscribe-btn {
                border-radius: 30px;
                width: 100%;
                margin: 5px 0;
                padding: 0.8rem 1.5rem;
            }
        }