* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #121212;
            color: #f0f0f0;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        header {
            background: #1e1e1e;
            padding: 15px 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        h1 {
            font-size: 2rem;
            text-align: center;
            margin-bottom: 10px;
            color: #ff6b6b;
        }
        
        h1 a {
            color: inherit;
            text-decoration: none;
        }
        
        h1 a:hover {
            opacity: 0.9;
        }
        
        main {
            padding: 40px 0;
            min-height: calc(100vh - 300px);
        }
        
        .content {
            background: #1e1e1e;
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        
        h2 {
            color: #ff6b6b;
            margin-bottom: 20px;
            font-size: 1.8rem;
            border-bottom: 2px solid #333;
            padding-bottom: 10px;
        }
        
        h3 {
            color: #ff9999;
            margin-top: 25px;
            margin-bottom: 15px;
            font-size: 1.3rem;
        }
        
        h4 {
            color: #ffaaaa;
            margin-top: 20px;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }
        
        p {
            margin-bottom: 15px;
            color: #e0e0e0;
            line-height: 1.7;
        }
        
        ul, ol {
            margin-left: 30px;
            margin-bottom: 15px;
            color: #e0e0e0;
        }
        
        li {
            margin-bottom: 8px;
            line-height: 1.7;
        }
        
        strong {
            color: #ff6b6b;
        }
        
        footer {
            background: #1e1e1e;
            padding: 30px 0;
            margin-top: 40px;
        }
        
        .footer-content {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
        }
        
        .footer-links {
            text-align: center;
        }
        
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            margin: 0 15px;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: #ff6b6b;
        }
        
        .footer-links a.active {
            color: #ff6b6b;
            font-weight: bold;
        }
        
        .copyright {
            text-align: center;
            margin-top: 20px;
            color: #666;
            font-size: 0.9rem;
        }
        
        .back-button {
            display: inline-block;
            margin-bottom: 20px;
            padding: 10px 20px;
            background: #ff6b6b;
            color: white;
            text-decoration: none;
            border-radius: 5px;
            transition: background 0.3s;
        }
        
        .back-button:hover {
            background: #ff5252;
        }
        
        @media (max-width: 768px) {
            h1 {
                font-size: 1.7rem;
            }
            
            h2 {
                font-size: 1.5rem;
            }
            
            h3 {
                font-size: 1.2rem;
            }
            
            .content {
                padding: 20px;
            }
            
            ul, ol {
                margin-left: 20px;
            }
            
            .footer-links a {
                margin: 0 8px;
                font-size: 0.85rem;
            }
        }
        
        @media (max-width: 480px) {
            h1 {
                font-size: 1.5rem;
            }
            
            .back-button {
                width: 100%;
                text-align: center;
            }
        }