/* Стили для меню с фиксированным позиционированием */
        .sidebar-menu {
            position: fixed;
            top: 0;
            left: 0;
            width: 250px;
            height: 100vh;
            background: linear-gradient(145deg, #3a8ee6, #76a9d9); /* Градиент */
            padding-top: 30px;
            z-index: 1000;
            box-shadow: 10px 0 30px rgba(0, 0, 0, 0.2);
            display: flex;
            flex-direction: column;
            transition: transform 0.3s ease-in-out;
            border-radius: 0 30px 30px 0;
        }

        .sidebar-menu ul {
            list-style-type: none;
            padding: 0;
        }

        .sidebar-menu li {
            padding: 15px 0;
            text-align: center;
        }

        .sidebar-menu a {
            color: white;
            font-size: 18px;
            font-weight: 600;
            text-decoration: none;
            display: block;
            padding: 12px;
            border-radius: 10px;
            background-color: transparent;
            transition: all 0.3s ease;
            position: relative;
        }

        .sidebar-menu a::after {
            content: "";
            position: absolute;
            width: 0;
            height: 2px;
            background-color: #fff;
            left: 50%;
            bottom: 0;
            transition: width 0.3s ease, left 0.3s ease;
        }

        .sidebar-menu a:hover {
            background-color: #2c5e91;
            padding-left: 20px;
            color: #ffd700;
        }

        .sidebar-menu a:hover::after {
            width: 100%;
            left: 0;
        }

        /* Основной контент */
        .content {
            margin-left: 270px;
            padding: 30px;
            background: #f5f8ff;
        }

        .section-background {
            background: #ffffff;
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 40px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
        }

        /* Кнопки скачивания */
        .document-button {
            background: linear-gradient(145deg, #ffb84d, #ff9a00);
            border: none;
            color: white;
            padding: 12px 24px;
            font-size: 16px;
            border-radius: 25px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
        }

        .document-button a {
            color: white;
            text-decoration: none;
            display: block;
        }

        .document-button:hover {
            background: linear-gradient(145deg, #ff9a00, #ffb84d);
            transform: translateY(-4px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
        }

        .document-button:active {
            transform: translateY(2px);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }