/* ===== Категории и список статей ===== */
        .categories-menu {
            margin-top: 10px;
        }

        .category-item {
            margin-bottom: 10px;
            border-radius: 4px;
            overflow: hidden;
            box-shadow: 0 1px 4px rgba(0,0,0,0.07);
        }

        .category-header {
            background: var(--main-color);
            padding: 13px 18px;
            cursor: pointer;
            user-select: none;
            transition: background 0.3s;
        }

        .category-header:hover {
            background: var(--accent-color);
        }

        .category-header h3 {
            margin: 0;
            font-size: 15px;
            color: #fff;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .toggle-icon {
            font-size: 16px;
            transition: transform 0.3s;
            opacity: 0.8;
        }

        .category-header.collapsed .toggle-icon {
            transform: rotate(-90deg);
        }

        .articles-list {
            padding: 8px 0;
            display: none;
            background: #f8f9fa;
            border: 1px solid var(--gray);
            border-top: none;
        }

        .articles-list.active {
            display: block;
        }

        .article-link {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 9px 18px;
            color: var(--text-color);
            text-decoration: none;
            font-size: 14px;
            transition: all 0.2s;
            border-bottom: 1px solid rgba(0,0,0,0.04);
        }

        .article-link:last-child {
            border-bottom: none;
        }

        .article-link:hover {
            background: #e8f0fb;
            color: var(--main-color);
            padding-left: 24px;
        }

        .article-link i {
            color: var(--main-color);
            opacity: 0.7;
            font-size: 13px;
            flex-shrink: 0;
        }

        .no-articles {
            color: #999;
            padding: 10px 18px;
            font-style: italic;
            font-size: 14px;
        }

        .library-title {
            font-size: 20px;
            color: var(--main-color);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light-bg);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .library-title i {
            font-size: 22px;
            opacity: 0.8;
        }

        /* ===== Полная статья ===== */
        .article-full {
            line-height: 1.7;
            color: var(--text-color);
        }

        .article-full h1 {
            font-size: 26px;
            color: var(--main-color);
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--light-bg);
        }

        .article-full h2 {
            color: #2980b9;
            margin: 25px 0 12px;
            font-size: 20px;
        }

        .article-full h3 {
            color: #16a085;
            margin: 20px 0 10px;
            font-size: 17px;
        }

        .article-full p {
            margin-bottom: 14px;
            text-align: justify;
        }

        .article-full ul,
        .article-full ol {
            margin: 12px 0 12px 28px;
        }

        .article-full li {
            margin-bottom: 5px;
        }

        .article-full blockquote {
            border-left: 4px solid var(--main-color);
            padding: 10px 18px;
            margin: 15px 0;
            color: #555;
            font-style: italic;
            background: var(--light-bg);
            border-radius: 0 4px 4px 0;
        }

        .article-full code {
            background: #f4f4f4;
            padding: 2px 6px;
            border-radius: 3px;
            font-family: monospace;
            font-size: 14px;
        }

        /* Изображение в статье */
        .article-image-wrap {
            float: right;
            width: 340px;
            margin: 0 0 18px 22px;
            border-radius: 6px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.12);
            overflow: hidden;
        }

        .article-image-wrap img {
            width: 100%;
            height: auto;
            display: block;
        }

        .image-caption {
            font-size: 12px;
            color: #777;
            text-align: center;
            padding: 6px 8px;
            background: #f5f5f5;
        }

        .article-full::after {
            content: "";
            clear: both;
            display: table;
        }

        /* Кнопка "Назад" */
        .back-button {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: var(--main-color);
            color: #fff;
            padding: 9px 18px;
            text-decoration: none;
            border-radius: 4px;
            margin-bottom: 22px;
            font-size: 14px;
            font-weight: 600;
            transition: background 0.3s;
        }

        .back-button:hover {
            background: var(--accent-color);
            color: #fff;
        }

        /* Адаптивность */
        @media (max-width: 768px) {
            .article-image-wrap {
                float: none;
                width: 100%;
                margin: 0 0 18px 0;
            }
        }