body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: #333;
            line-height: 1.7;
        }

        /* 顶部横幅 */
        .hero-banner {
            position: relative;
            height: 320px;
            background: url('https://images.unsplash.com/photo-1498050108023-c5249f4df085?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            display: flex;
            align-items: flex-end;
            padding-bottom: 2rem;
        }
        .hero-banner::after {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.45);
        }
        .hero-content {
            position: relative;
            z-index: 1;
            width: 100%;
        }
        .tag-label {
            display: inline-block;
            border: 1px solid white;
            border-radius: 2rem;
            padding: 0.3rem 1rem;
            font-size: 0.85rem;
            margin-bottom: 0.75rem;
        }
        .hero-title {
            font-size: 2.25rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
        }
        .hero-desc {
            font-size: 1rem;
            opacity: 0.9;
        }

        /* 文章元信息 */
        .article-meta {
            font-size: 0.9rem;
            color: #666;
            padding: 1.5rem 0;
        }
        .article-meta span {
            margin-right: 1.5rem;
            display: inline-flex;
            align-items: center;
        }
        .article-meta span img{
            width: 1rem;
            margin-right: 0.4rem;
        }

        /* 文章内容 */
        .article-content h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 2.5rem 0 1.25rem;
        }
        .article-content h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin: 2rem 0 1rem;
        }
        .article-content p {
            margin-bottom: 1rem;
        }
        .article-content ul, .article-content ol {
            padding-left: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .article-content .example-item {
            margin: 0.5rem 0;
            color: #0D0D0D;
        }
        .article-content .highlight {
            color: #d93025;
            font-weight: 500;
        }
        .article-content .checkmark {
            color: #28a745;
            margin-right: 0.5rem;
        }

        /* 图片容器 */
        .article-img {
            width: 100%;
            border-radius: 0.5rem;
            margin: 2rem 0;
        }
        .video-img {
            border-radius: 1rem;
            position: relative;
        }
        .play-btn {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 60px;
            height: 60px;
            background: rgba(255,255,255,0.9);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #333;
            font-size: 1.5rem;
        }

        /* 引用块 */
        .quote-block {
            padding: 1.5rem;
            margin: 2rem 0;
            position: relative;
            display: flex;
            justify-content: space-between;
        }
        .quote-block img{
            width: 2.5rem;
            height: 2.5rem;
        }
        .quote-block img:nth-child(1){
            margin-right: 5px;
            position: absolute;
            top: 0;
            left: 0;
        }
        .quote-block img:nth-child(3){
            margin-left: 5px;
            position: absolute;
            bottom: 0;
            right: 0;
        }
        .quote-block-content{
             font-size: 1.1rem;
            font-style: italic;
            margin: -20px 20px;
        }
        /* 总结部分 */
        .summary-section {
            padding: 1.5rem;
            border-radius: 0.5rem;
            margin: 2rem 0;
        }
        .summary-section h4 {
            color: #f59e0b;
            font-weight: 700;
            margin-bottom: 1rem;
        }

        /* 滚动进场动画 */
        .fade-in {
            opacity: 0;
            transform: translateY(25px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .hero-banner {
                height: 260px;
            }
            .hero-title {
                font-size: 1.75rem;
            }
            .article-content h2 {
                font-size: 1.3rem;
            }
            .article-content h3 {
                font-size: 1.15rem;
            }
            .back-to-top {
                bottom: 1rem;
                right: 1rem;
                width: 40px;
                height: 40px;
            }
             .quote-block img{
            width: 2.5rem;
            height: 2.5rem;
        }
        }