.body-2 {
            font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: #1a1a1a;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 2rem;
        }

        .container-s {
            max-width: 100%;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 3rem;
            box-shadow: 
                0 20px 40px rgba(0, 0, 0, 0.1),
                0 0 0 1px rgba(255, 255, 255, 0.2);
        }

        .article-header {
            text-align: center;
            margin-bottom: 3rem;
            padding-bottom: 2rem;
            border-bottom: 2px solid #e8e8e8;
        }

        .article-title {
            font-size: 3rem;
            font-weight: 800;
            background: linear-gradient(135deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 1rem;
        }

        .article-meta {
            display: flex;
            justify-content: center;
            gap: 2rem;
            color: #666;
            font-size: 0.9rem;
        }

        .toc {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            padding: 2rem;
            border-radius: 15px;
            margin: 2rem 0;
            position: relative;
            overflow: hidden;
        }

        .toc::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, #667eea, #764ba2);
        }

        .toc-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            color: #2d3748;
        }

        .toc-list {
            list-style: none;
            counter-reset: toc-counter;
        }

        .toc-item {
            margin-bottom: 0.8rem;
            counter-increment: toc-counter;
            opacity: 0;
            transform: translateX(-20px);
            animation: slideIn 0.6s ease forwards;
        }

        .toc-item:nth-child(1) { animation-delay: 0.1s; }
        .toc-item:nth-child(2) { animation-delay: 0.2s; }
        .toc-item:nth-child(3) { animation-delay: 0.3s; }
        .toc-item:nth-child(4) { animation-delay: 0.4s; }
        .toc-item:nth-child(5) { animation-delay: 0.5s; }

        .toc-link {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: #2d3748;
            padding: 0.8rem 1rem;
            border-radius: 10px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .toc-link::before {
            content: counter(toc-counter) ".";
            font-weight: 600;
            margin-right: 1rem;
            color: #667eea;
            min-width: 2rem;
        }

        .toc-link::after {
            content: '';
            position: absolute;
            left: -100%;
            top: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
            transition: left 0.5s ease;
        }

        .toc-link:hover {
            background: rgba(255, 255, 255, 0.8);
            transform: translateX(10px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .toc-link:hover::after {
            left: 100%;
        }

        .toc-link:hover .toc-number {
            transform: scale(1.2);
            color: #764ba2;
        }

        .progress-bar {
            position: fixed;
            top: 0;
            left: 0;
            width: 0;
            height: 4px;
            background: linear-gradient(90deg, #667eea, #764ba2);
            z-index: 1000;
            transition: width 0.3s ease;
        }

        @keyframes slideIn {
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        @media (max-width: 768px) {
            .container {
                padding: 1.5rem;
                margin: 1rem;
            }
            
            .article-title {
                font-size: 2rem;
            }
            
            .article-meta {
                flex-direction: column;
                gap: 0.5rem;
            }
            
            .toc {
                padding: 1.5rem;
            }
        }

        @media (max-width: 480px) {
            body {
                padding: 1rem;
            }
            
            .article-title {
                font-size: 1.8rem;
            }
            
            .toc-link {
                padding: 0.6rem;
            }
        }