:root {
            --primary-color: #234a79;
            --primary-hover: #1f4d8c;
            --accent-color: #3976be;
            --light-bg: #f0f3fa;
            --text-dark: #334155;
            --text-muted: #64748b;
        }

        body {
            font-family: 'Manrope', 'Inter', sans-serif;
            color: var(--text-dark);
            background-color: #ffffff;
            overflow-x: hidden;
        }

        /* Навигация */
        .navbar-custom {
            background-color: #ffffff;
            padding: 15px 0;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
            position: relative;
        }
        .navbar-brand img {
            max-width: 210px;
            height: auto;
        }
        .nav-link-custom {
            color: var(--text-dark) !important;
            font-weight: 700;
            margin-right: 15px;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            transition: color 0.2s;
        }
        .nav-link-custom:hover {
            color: var(--accent-color) !important;
        }

        /* Мега-меню */
        @media (min-width: 992px) {
            .nav-item-mega {
                position: static !important;
            }
            .mega-menu {
                position: absolute;
                top: 100%;
                left: 50%;
                transform: translateX(-50%) translateY(15px);
                width: 100%;
                max-width: 1140px;
                background-color: #ffffff;
                border-radius: 16px;
                box-shadow: 0px 15px 35px rgba(0, 11, 48, 0.15);
                border: 1px solid rgba(0,0,0,0.05);
                padding: 30px;
                opacity: 0;
                visibility: hidden;
                transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
                z-index: 1000;
            }
            .nav-item-mega:hover .mega-menu {
                opacity: 1;
                visibility: visible;
                transform: translateX(-50%) translateY(0);
            }
        }

        .mega-menu-item {
            display: flex;
            align-items: flex-start;
            gap: 15px;
            text-decoration: none;
            color: inherit;
            padding: 8px;
            border-radius: 8px;
            transition: background-color 0.2s, transform 0.2s;
        }
        .mega-menu-item:hover {
            background-color: #f8fafc;
            transform: translateY(-2px);
        }
        .mega-menu-icon {
            width: 48px;
            height: 48px;
            object-fit: contain;
            flex-shrink: 0;
        }
        .mega-menu-title {
            font-size: 14px;
            font-weight: 700;
            color: #1f4d8c;
            margin: 0 0 4px 0;
            line-height: 1.3;
        }
        .mega-menu-item:hover .mega-menu-title {
            color: #0260e8;
        }
        .mega-menu-desc {
            font-size: 11px;
            color: #64748b;
            margin: 0;
            line-height: 1.4;
        }

        @media (max-width: 991px) {
            .mega-menu {
                background-color: #f8fafc;
                border-radius: 8px;
                padding: 15px;
                margin-top: 10px;
                display: none;
            }
            .nav-item-mega.active-mobile .mega-menu {
                display: block;
            }
            .mega-menu-item {
                margin-bottom: 12px;
            }
        }

        /* Hero / Заголовок категории */
        .category-hero {
            background-color: var(--primary-color);
            color: #ffffff;
            padding: 70px 0;
            text-align: center;
        }
        .category-hero h1 {
            font-weight: 800;
            font-size: 2.6rem;
            margin: 0;
        }

        /* Карточки продукции */
        .panels-grid-section {
            padding: 80px 0;
            background-color: #ffffff;
        }
        .panels-card {
            background-color: var(--light-bg);
            border-radius: 12px;
            border: none;
            height: 100%;
            transition: all 0.3s ease;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .panels-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 11, 48, 0.12);
        }
        .panels-card-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            flex-grow: 1;
        }
        .panels-card-title {
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--primary-hover);
            margin-bottom: 12px;
        }
        .panels-card-list {
            list-style: none;
            padding-left: 0;
            margin-bottom: 25px;
            color: var(--text-muted);
            font-size: 0.95rem;
        }
        .panels-card-list li {
            margin-bottom: 8px;
        }

        /* Кнопки */
        .btn-brand-primary {
            background-color: var(--primary-color);
            color: #ffffff;
            border: none;
            border-radius: 8px;
            padding: 10px 20px;
            font-weight: 600;
            transition: background-color 0.2s;
        }
        .btn-brand-primary:hover {
            background-color: var(--accent-color);
            color: #ffffff;
        }

        /* Текстовый SEO блок */
        .aysu-section {
            max-width: 1160px;
            margin: 40px auto;
            font-family: 'Inter', system-ui, Arial, sans-serif;
            color: #334155;
            padding: 0 20px;
            box-sizing: border-box;
        }
        .aysu-title {
            margin: 0 0 16px;
            color: #1f4d8c; 
            font-size: 28px;
            line-height: 1.2;
            font-weight: 700;
        }
        .aysu-lead {
            margin: 0 0 30px;
            color: #475569;
            font-size: 16px;
            line-height: 1.6;
        }
        .aysu-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }
        .aysu-card-text {
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 20px;
            background: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
        }
        .aysu-card-title-text {
            font-weight: 700;
            margin-bottom: 10px;
            color: #1f4d8c;
            font-size: 17px;
        }
        .aysu-list {
            margin: 0;
            padding-left: 0;
            list-style: none;
            color: #64748b;
            line-height: 1.5;
            font-size: 14px;
        }

        /* Виджет обратной связи */
        .floating-widget {
            position: fixed;
            right: 25px;
            bottom: 25px;
            z-index: 1000;
        }
        .widget-btn {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: var(--primary-color);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(0,0,0,0.25);
            transition: all 0.3s ease;
        }
        .widget-btn:hover {
            background-color: var(--accent-color);
            transform: scale(1.05);
        }
        .widget-menu {
            position: absolute;
            bottom: 75px;
            right: 0;
            display: none;
            flex-direction: column;
            gap: 10px;
        }
        .widget-menu.show {
            display: flex;
        }
        .widget-item {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            box-shadow: 0 4px 10px rgba(0,0,0,0.15);
        }

        /* Планшеты и телефоны */
        @media (max-width: 991px) {
            .navbar-custom {
                padding: 10px 0;
            }
            .navbar-brand img {
                max-width: 160px;
            }
            .navbar-collapse {
                margin-top: 10px;
                padding: 10px 12px;
                background: #ffffff;
                border-radius: 10px;
                box-shadow: 0 6px 18px rgba(0, 11, 48, 0.1);
                max-height: calc(100vh - 90px);
                overflow-y: auto;
            }
            .navbar-nav {
                align-items: flex-start !important;
                width: 100%;
            }
            .nav-link-custom {
                margin-right: 0;
                margin-bottom: 6px;
                font-size: 13px;
                line-height: 1.4;
            }
            #languageSwitcher {
                width: 92px;
            }

            .category-hero {
                padding: 56px 0 !important;
            }
            .category-hero h1 {
                font-size: 2rem;
                line-height: 1.25;
            }
            .category-hero .lead {
                font-size: 1rem;
                margin-top: 0.75rem !important;
            }

            .panels-grid-section {
                padding: 48px 0;
            }
            .panels-card {
                border-radius: 10px;
            }
            .panels-card-body {
                padding: 18px;
            }
            .panels-card-title {
                font-size: 1.05rem;
                margin-bottom: 10px;
            }
            .panels-card-list {
                font-size: 0.9rem;
                margin-bottom: 14px;
            }

            .aysu-section {
                margin: 24px auto;
                padding: 0 14px;
            }
            .aysu-title {
                font-size: 24px;
            }
            .aysu-lead {
                font-size: 15px;
                margin-bottom: 20px;
            }
            .aysu-seo-text {
                margin-top: 24px;
                padding-top: 22px;
                font-size: 14px;
                line-height: 1.65;
            }
            .seo-section .d-flex.gap-3 {
                flex-direction: column;
                align-items: stretch !important;
            }
            .seo-section .d-flex.gap-3 .btn {
                width: 100%;
            }

            .floating-widget {
                right: 14px !important;
                bottom: 14px !important;
            }
            .widget-btn {
                width: 52px !important;
                height: 52px !important;
                font-size: 20px !important;
            }
            .widget-item {
                width: 44px !important;
                height: 44px !important;
            }
        }

        @media (max-width: 575px) {
            .category-hero {
                padding: 44px 0 !important;
            }
            .category-hero h1 {
                font-size: 1.55rem;
            }
            .category-hero .lead {
                font-size: 0.92rem;
                line-height: 1.45;
            }
            .panels-grid-section .row {
                --bs-gutter-y: 0.8rem;
            }
            .btn,
            .btn-sm {
                font-size: 0.92rem;
            }
            .modal-body {
                padding: 14px;
            }
            .modal-footer {
                padding: 12px 14px;
            }
        }