* {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            position: relative;
        }
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
            pointer-events: none;
            z-index: 0;
        }
        .page-container {
            position: relative;
            z-index: 1;
            padding: 40px 20px;
        }
        .content-wrapper {
            max-width: 1100px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(10px);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            border-radius: 20px;
            overflow: hidden;
            animation: fadeInUp 0.6s ease-out;
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .header-section {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            padding: 50px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .header-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
            animation: rotate 20s linear infinite;
        }
        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }
        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            background: rgba(255, 255, 255, 0.2);
            color: white;
            text-decoration: none;
            font-weight: 500;
            border-radius: 50px;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.3);
            position: absolute;
            left: 24px;
            top: 24px;
            z-index: 2;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
        }
        .back-link:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        h1 {
            font-size: 42px;
            font-weight: 800;
            margin: 20px 0;
            color: white;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
            position: relative;
            z-index: 2;
        }
        .update-date {
            color: rgba(255, 255, 255, 0.9);
            font-size: 14px;
            position: relative;
            z-index: 2;
        }
        .content-body {
            padding: 50px 60px;
        }
        .toc-container {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 40px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .toc-title {
            font-size: 20px;
            font-weight: 700;
            color: #2d3748;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .toc-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .toc-list li {
            margin: 8px 0;
        }
        .toc-list a {
            color: #4a5568;
            text-decoration: none;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 12px;
            border-radius: 8px;
        }
        .toc-list a:hover {
            color: #667eea;
            background: rgba(102, 126, 234, 0.1);
            transform: translateX(5px);
        }
        h2 {
            font-size: 26px;
            font-weight: 700;
            margin-top: 68px;
            margin-bottom: 24px;
            color: #1a202c;
            padding-left: 20px;
            border-left: 5px solid #667eea;
            position: relative;
            scroll-margin-top: 20px;
        }
        h2::before {
            content: '';
            position: absolute;
            left: -5px;
            top: 0;
            width: 5px;
            height: 100%;
            background: linear-gradient(180deg, #667eea 0%, #764ba2 100%);
            border-radius: 3px;
        }
        h3 {
            font-size: 20px;
            font-weight: 700;
            margin-top: 30px;
            margin-bottom: 15px;
            color: #2d3748;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        h3::before {
            content: '▸';
            color: #667eea;
            font-size: 24px;
        }
        p, li {
            line-height: 2;
            color: #4a5568;
            margin-bottom: 15px;
            text-align: justify;
        }
        .sub-item {
            margin-left: 2em;
            color: #5a6778;
            position: relative;
            padding-left: 15px;
        }
        .sub-item::before {
            content: '•';
            position: absolute;
            left: 0;
            color: #667eea;
            font-weight: bold;
        }
        .footer-info {
            margin-top: 60px;
            padding: 30px;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            text-align: center;
            color: #4a5568;
            border-radius: 15px;
        }
        .footer-info p {
            margin: 5px 0;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 50%;
            cursor: pointer;
            display: none;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
        }
        .back-to-top.show {
            display: flex;
        }
        @media (max-width: 768px) {
            .header-section {
                padding-top: 88px;
            }
            .back-link {
                left: 16px;
                top: 16px;
                padding: 10px 18px;
                font-size: 14px;
            }
            .content-body {
                padding: 30px 25px;
            }
            h1 {
                font-size: 32px;
            }
            h2 {
                font-size: 22px;
                margin-top: 56px;
                margin-bottom: 20px;
            }
        }