* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Arial', sans-serif;
            color: #1a1a1a; /* Темно-серый/почти черный текст */
            /*background: linear-gradient(135deg, #12122a 0%, #1c1c3a 100%);*/
            background: #fff;
            position: relative;
            overflow-x: hidden;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* Сложный фон с наложением текстур */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('/index_files/dark-mosaic.png');
            opacity: 0.2;
            z-index: -2;
        }

        body::after {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at center, rgba(255, 255, 255, 0.08), transparent 70%);
            z-index: -1;
        }

        /* Шапка */
        header {
            background: linear-gradient(180deg, #1a1a3a 0%, #12122a 100%);
            padding: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(5px);
        }

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: #00d4ff;
        }

        /* Поле поиска */
        .search-container {
            display: flex;
            align-items: center;
        }

        .search-container input {
            padding: 8px 12px;
            font-size: 1rem;
            color: #e0e0e0;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid #00d4ff;
            width: 200px;
            transition: all 0.3s ease;
        }

        .search-container input:focus {
            outline: none;
            background: rgba(255, 255, 255, 0.1);
            border-color: #00b0ff;
        }

        .search-container input::placeholder {
            color: #a0a0a0;
        }

        /* Основной контейнер */
        .container {
            display: grid;
            grid-template-columns: 1fr 250px;
            flex: 1;
            padding: 20px;
            gap: 20px;
        }

        /* Контентная область */
        .content {
            background: rgba(255, 255, 255, 0.03);
            padding: 40px;
            backdrop-filter: blur(5px);
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .content h1 {
            font-size: 2.5rem;
            color: #00d4ff;
        }

        .content p, .content h2 {
            line-height: 1.6;
            font-size: 1.1rem;
            max-width: 800px;
            color: #1a1a1a; /* Темно-серый/почти черный текст */
        }

        /* Вертикальное меню */
        .sidebar {
            position: fixed;
            right: 20px;
            top: 80px;
            bottom: 20px;
            width: 250px;
            background: linear-gradient(180deg, #1a1a3a 0%, #0e0e24 100%);
            padding: 20px;
            z-index: 10;
            overflow-y: auto;
        }

        .sidebar nav {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .menu {
            width: 100%;
        }

        .main-navigation {
            list-style: none;
        }

        .main-navigation li {
            position: relative;
        }

        .main-navigation li a {
            text-decoration: none;
            color: #e0e0e0;
            font-size: 1.1rem;
            padding: 12px 15px;
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            gap: 10px;
            transition: all 0.3s ease;
        }

        .main-navigation li a b {
            font-weight: normal; /* Убираем жирность, так как <b> в HTML */
        }

        .main-navigation li a:hover {
            background: #00d4ff;
            color: #12122a;
            transform: translateX(5px);
        }

        .main-navigation li a::before {
            content: '★';
            font-size: 0.9rem;
            color: #00d4ff;
        }

        /* Подменю */
        .main-navigation li.open > ul.main-navigation, .main-navigation li.active > ul.main-navigation {
            display: block;
        }

        .main-navigation li ul.main-navigation {
            display: none;
            padding: 10px 0;
            margin-left: 20px;
        }

        .main-navigation li ul.main-navigation li a {
            font-size: 1rem;
            padding: 8px 15px;
            background: none;
        }

        .main-navigation li ul.main-navigation li a:hover {
            color: #00d4ff;
            transform: translateX(5px);
        }

        /* Третий уровень вложенности */
        .main-navigation li ul.main-navigation li ul.main-navigation {
            margin-left: 15px;
            padding: 8px 0;
        }

        .main-navigation li ul.main-navigation li ul.main-navigation li a {
            font-size: 0.9rem;
            padding: 6px 15px;
        }

        /* Добавим пример третьего уровня вложенности */
        .main-navigation li ul.main-navigation li.submenu-item {
            position: relative;
        }

        .main-navigation li ul.main-navigation li.submenu-item ul.main-navigation {
            display: none;
        }

        .main-navigation li ul.main-navigation li.submenu-item:hover ul.main-navigation {
            display: block;
        }

        /* Карточки в контенте */
        .card {
            background: linear-gradient(45deg, #2a2a5a, #3a3a7a);
            padding: 20px;
            transition: transform 0.3s ease;
        }

        .card:hover {
            transform: scale(1.02);
        }

        /* Копирайт */
        footer {
            background: #12122a;
            padding: 15px;
            text-align: center;
            color: #a0a0a0;
            font-size: 0.9rem;
        }

        /* Анимация для загрузки */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .content > * {
            animation: fadeIn 0.5s ease forwards;
            opacity: 0;
        }

        .content > *:nth-child(1) { animation-delay: 0.1s; }
        .content > *:nth-child(2) { animation-delay: 0.2s; }
        .content > *:nth-child(3) { animation-delay: 0.3s; }
        .content > *:nth-child(4) { animation-delay: 0.4s; }

        /* Адаптивность */
        @media (max-width: 768px) {
            .container {
                grid-template-columns: 1fr;
            }

            .sidebar {
                position: relative;
                width: 100%;
                right: 0;
                top: 0;
                bottom: auto;
            }

            .main-navigation li ul.main-navigation {
                position: static;
            }

            .main-navigation li.open > ul.main-navigation, .main-navigation li.active > ul.main-navigation {
                display: block;
            }

            .main-navigation li ul.main-navigation li.submenu-item:hover ul.main-navigation {
                display: block;
            }

            .search-container input {
                width: 150px;
            }
        }

        body::after {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at center, rgba(255, 255, 255, 0.08), transparent 70%);
            z-index: -1;
        }

        /* Шапка */
        header {
            background: linear-gradient(180deg, #1a1a3a 0%, #12122a 100%);
            padding: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(5px);
        }

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: #00d4ff;
        }

        /* Поле поиска */
        .search-container {
            display: flex;
            align-items: center;
        }

        .search-container input {
            padding: 8px 12px;
            font-size: 1rem;
            color: #e0e0e0;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid #00d4ff;
            width: 200px;
            transition: all 0.3s ease;
        }

        .search-container input:focus {
            outline: none;
            background: rgba(255, 255, 255, 0.1);
            border-color: #00b0ff;
        }

        .search-container input::placeholder {
            color: #a0a0a0;
        }

        /* Основной контейнер */
        .container {
            display: grid;
            grid-template-columns: 1fr 250px;
            flex: 1;
            padding: 20px;
            gap: 20px;
        }

        /* Контентная область */
        .content {
            background: rgba(255, 255, 255, 0.03);
            padding: 40px;
            backdrop-filter: blur(5px);
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .content h1 {
            font-size: 2.5rem;
            color: #00d4ff;
        }

        .content p, .content h2 {
            line-height: 1.6;
            font-size: 1.1rem;
            max-width: 800px;
            color: #1a1a1a; /* Темно-серый/почти черный текст */
        }

        /* Вертикальное меню */
        .sidebar {
            position: fixed;
            right: 20px;
            top: 80px;
            bottom: 20px;
            width: 250px;
            background: linear-gradient(180deg, #1a1a3a 0%, #0e0e24 100%);
            padding: 20px;
            z-index: 10;
            overflow-y: auto;
        }

        .sidebar nav {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .menu-item > a {
            text-decoration: none;
            color: #e0e0e0;
            font-size: 1.1rem;
            padding: 12px 15px;
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            gap: 10px;
            transition: all 0.3s ease;
        }

        .menu-item > a:hover {
            background: #00d4ff;
            color: #12122a;
            transform: translateX(5px);
        }

        .menu-item > a::before {
            content: '★';
            font-size: 0.9rem;
            color: #00d4ff;
        }

        /* Вложенное меню */
        .submenu {
            flex-direction: column;
            gap: 5px;
            padding: 10px 0;
            margin-left: 20px;
        }

        .menu-item.active .submenu {
            display: flex;
        }

        .submenu a {
            text-decoration: none;
            color: #e0e0e0;
            font-size: 1rem;
            padding: 8px 15px;
            transition: all 0.3s ease;
        }

        .submenu a:hover {
            color: #00d4ff;
            transform: translateX(5px);
        }

        /* Третий уровень вложенности */
        .sub-submenu {
            flex-direction: column;
            gap: 5px;
            padding: 8px 0;
            margin-left: 15px;
            display: none;
        }

        .submenu-item:hover .sub-submenu {
            display: flex;
        }

        .sub-submenu a {
            font-size: 0.9rem;
            padding: 6px 15px;
            color: #e0e0e0;
            transition: all 0.3s ease;
        }

        .sub-submenu a:hover {
            color: #00d4ff;
            transform: translateX(5px);
        }

        /* Карточки в контенте */
        .card {
            background: linear-gradient(45deg, #2a2a5a, #3a3a7a);
            padding: 20px;
            transition: transform 0.3s ease;
        }

        .card:hover {
            transform: scale(1.02);
        }

        /* Копирайт */
        footer {
            background: #12122a;
            padding: 15px;
            text-align: center;
            color: #a0a0a0;
            font-size: 0.9rem;
        }

        /* Анимация для загрузки */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .content > * {
            animation: fadeIn 0.5s ease forwards;
            opacity: 0;
        }

        .content > *:nth-child(1) { animation-delay: 0.1s; }
        .content > *:nth-child(2) { animation-delay: 0.2s; }
        .content > *:nth-child(3) { animation-delay: 0.3s; }
        .content > *:nth-child(4) { animation-delay: 0.4s; }

        /* Адаптивность */
        @media (max-width: 768px) {
            .container {
                grid-template-columns: 1fr;
            }

            .sidebar {
                position: relative;
                width: 100%;
                right: 0;
                top: 0;
                bottom: auto;
            }

            .submenu, .sub-submenu {
                position: static;
            }

            .menu-item.active .submenu {
                display: flex;
            }

            .submenu-item:hover .sub-submenu {
                display: flex;
            }

            .search-container input {
                width: 150px;
            }
        }