* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        
        /* Шапка сайта */
        header {
            background: linear-gradient(135deg, #6e8efb, #a777e3);
            color: white;
            padding: 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .logo-container {
            display: flex;
            align-items: center;
        }
        
        .logo {
            font-size: 2rem;
            font-weight: bold;
            margin-right: 1rem;
            background: white;
            color: #6e8efb;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .slogan {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        
        /* Контейнер основного содержимого */
        .container {
            display: flex;
            min-height: calc(100vh - 80px);
        }
        
        /* Стили для меню */
        .sidebar {
            width: 250px;
            background-color: white;
            box-shadow: 2px 0 10px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            overflow-y: auto;
        }
        
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: white;
            cursor: pointer;
            padding: 0.5rem;
        }
        
        .menu {
            list-style: none;
            padding: 1rem 0;
        }
        
        .menu-item {
            position: relative;
        }
        
        .menu-item > a {
            display: block;
            padding: 0.8rem 1.5rem;
            color: #444;
            text-decoration: none;
            transition: all 0.2s;
            border-left: 4px solid transparent;
        }
        
        .menu-item > a:hover {
            background-color: #f5f7ff;
            border-left: 4px solid #6e8efb;
            color: #6e8efb;
        }
        
        .submenu {
            list-style: none;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            background-color: #f8f9fa;
        }
        
        .submenu.open {
            max-height: 500px;
        }
        
        .submenu a {
            display: block;
            padding: 0.8rem 1.5rem 0.8rem 2.5rem;
            color: #666;
            text-decoration: none;
            transition: all 0.2s;
        }
        
        .submenu a:hover {
            background-color: #edf0ff;
            color: #6e8efb;
        }
        
        .has-submenu > a::after {
            content: "›";
            float: right;
            transform: rotate(90deg);
            transition: transform 0.3s;
        }
        
        .has-submenu.open > a::after {
            transform: rotate(0deg);
        }
        
        /* Основное содержимое */
        .main-content {
            flex: 1;
            padding: 2rem;
            background-color: #f8f9fa;
        }
        
        .content-section {
            background: white;
            border-radius: 8px;
            padding: 2rem;
            margin-bottom: 2rem;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.03);
        }
        
        h1, h2 {
            color: #444;
            margin-bottom: 1rem;
        }
        
        p {
            margin-bottom: 1rem;
        }
        
        /* Адаптивность */
        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }
            
            .sidebar {
                position: fixed;
                left: -250px;
                height: calc(100vh - 80px);
                z-index: 1000;
            }
            
            .sidebar.open {
                left: 0;
            }
            
            .overlay {
                display: none;
                position: fixed;
                top: 80px;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(0, 0, 0, 0.5);
                z-index: 999;
            }
            
            .overlay.open {
                display: block;
            }
        }