nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 65px;
        background: var(--nav-bg);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 5%;
        z-index: 1000;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
    }

    .logo {
        font-size: 1.3rem;
        font-weight: 900;
        color: var(--text-main);
        letter-spacing: 0.5px;
        flex-shrink: 0;
    }

    
    .nav-categories {
        display: flex;
        gap: 30px;
        align-items: center;
        flex: 1;
        justify-content: center;
        overflow-x: auto;
        scrollbar-width: none;
        padding: 0 20px;
    }

    .nav-categories::-webkit-scrollbar {
        display: none;
    }

    .nav-categories button {
        color: #666;
        font-size: 0.95rem;
        font-weight: 600;
        transition: all 0.3s;
        cursor: pointer;
        background: transparent;
        border: none;
        padding: 5px 0;
        position: relative;
        font-family: inherit;
        white-space: nowrap;
    }

    .nav-categories button:hover,
    .nav-categories button.active {
        color: var(--accent-blue);
    }

    .nav-categories button.active::after {
        content: '';
        position: absolute;
        bottom: -5px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--accent-blue);
        border-radius: 3px;
    }

    .btn-primary {
        background: linear-gradient(90deg, var(--accent-blue) 0%, var(--accent-cyan) 100%);
        color: #FFF !important;
        padding: 10px 24px;
        border-radius: 30px;
        font-size: 0.9rem;
        font-weight: 600;
        transition: 0.3s;
        cursor: pointer;
        box-shadow: 0 5px 15px rgba(0, 113, 227, 0.2);
        white-space: nowrap;
        border: none;
        flex-shrink: 0;
    }

    .btn-primary:hover {
        box-shadow: 0 8px 25px rgba(0, 113, 227, 0.35);
        transform: translateY(-2px);
    }

    
    .page-header {
        max-width: 1400px;
        margin: 110px auto 30px auto;
        padding: 0 5%;
    }

    
    .page-title-row {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 15px;
        flex-wrap: wrap;
        gap: 15px;
    }

    .page-title {
        font-size: 2.5rem;
        font-weight: 800;
        color: var(--text-main);
        margin-bottom: 0;
        letter-spacing: -0.5px;
    }

    .page-subtitle {
        font-size: 1.1rem;
        color: var(--text-muted);
        margin-bottom: 0;
    }

    
    .btn-return {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
        color: var(--text-muted);
        padding: 10px 22px;
        border-radius: 30px;
        font-size: 0.95rem;
        font-weight: 600;
        transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
    }

    .btn-return:hover {
        border-color: var(--accent-blue);
        color: var(--accent-blue);
        box-shadow: 0 6px 15px rgba(0, 113, 227, 0.1);
        transform: translateY(-2px);
    }

    .btn-return svg {
        transition: transform 0.3s;
    }

    .btn-return:hover svg {
        transform: translateX(-3px);
    }

    
    .layout-container {
        display: flex;
        align-items: flex-start;
        max-width: 1400px;
        margin: 0 auto 60px auto;
        padding: 0 5%;
        gap: 40px;
    }

    
    .sidebar-toc {
        position: sticky;
        top: 95px;
        width: 280px;
        flex-shrink: 0;
        background: var(--bg-secondary);
        border-radius: 20px;
        padding: 30px 25px;
        box-shadow: var(--shadow-base);
        border: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
        max-height: calc(100vh - 130px);
    }

    .sidebar-toc h3 {
        font-size: 1.15rem;
        color: var(--text-main);
        margin-bottom: 15px;
        font-weight: 800;
        border-bottom: 1px solid #E5E5EA;
        padding-bottom: 15px;
    }

    .toc-list {
        flex: 1;
        overflow-y: auto;
        scrollbar-width: thin;
        padding-right: 5px;
        margin-bottom: 20px;
        padding-left: 0;
    }

    .toc-list::-webkit-scrollbar {
        width: 4px;
    }

    .toc-list::-webkit-scrollbar-thumb {
        background: #CCC;
        border-radius: 4px;
    }

    .toc-category-title {
        font-size: 0.85rem;
        color: #888;
        font-weight: 700;
        margin: 20px 0 10px 0;
        text-transform: uppercase;
        letter-spacing: 1px;
    }

    .sidebar-toc .toc-category-title:first-of-type {
        margin-top: 0;
    }

    .toc-list li {
        margin-bottom: 8px;
    }

    .toc-list a {
        display: block;
        font-size: 0.9rem;
        color: var(--text-muted);
        padding: 10px 12px;
        border-radius: 8px;
        transition: all 0.3s ease;
        line-height: 1.4;
        font-weight: 500;
        text-overflow: ellipsis;
        overflow: hidden;
        white-space: nowrap;
    }

    .toc-list a:hover {
        background: rgba(0, 113, 227, 0.05);
        color: var(--accent-blue);
    }

    .toc-list a.active {
        background: var(--accent-blue);
        color: #FFF;
        box-shadow: 0 4px 12px rgba(0, 113, 227, 0.3);
        font-weight: 600;
    }

    .sidebar-pagination {
        display: flex;
        flex-wrap: nowrap;
        justify-content: center;
        align-items: center;
        gap: 4px;
        padding-top: 15px;
        border-top: 1px dashed #E5E5EA;
        margin-top: auto;
    }

    .side-page-btn {
        background: #F9F9F9;
        border: 1px solid #E5E5EA;
        color: var(--text-muted);
        min-width: 26px;
        height: 28px;
        padding: 0 4px;
        border-radius: 6px;
        font-size: 0.8rem;
        font-weight: 600;
        cursor: pointer;
        transition: 0.3s;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
    }

    .side-page-btn svg {
        width: 14px;
        height: 14px;
        stroke: currentColor;
    }

    .side-page-btn:hover:not(.disabled) {
        border-color: var(--accent-blue);
        color: var(--accent-blue);
        box-shadow: 0 4px 10px rgba(0, 113, 227, 0.1);
    }

    .side-page-btn.active {
        background: var(--accent-blue);
        color: #FFF;
        border-color: var(--accent-blue);
        box-shadow: 0 4px 10px rgba(0, 113, 227, 0.2);
    }

    .side-page-btn.disabled {
        opacity: 0.4;
        cursor: not-allowed;
    }

    .side-page-dots {
        color: #888;
        font-size: 0.8rem;
        font-weight: 600;
        letter-spacing: 1px;
        flex-shrink: 0;
    }

    
    .main-content {
        flex: 1;
        min-width: 0;
    }

    .solutions-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 25px;
    }

    
    .sol-card {
        display: flex;
        flex-direction: column;
        background: var(--bg-secondary);
        border-radius: 16px;
        overflow: hidden;
        border: 1px solid var(--border-color);
        transition: 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        cursor: pointer;
        box-shadow: var(--shadow-base);
        text-decoration: none;
        color: inherit;
        height: 100%;
        scroll-margin-top: 90px;
    }

    .sol-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
        border-color: rgba(0, 113, 227, 0.3);
    }

    .sol-img-ph {
        width: 100%;
        height: 180px;
        background: #F0F0F0;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #AAA;
        font-size: 0.85rem;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        position: relative;
        overflow: hidden;
    }

    .sol-img-ph img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.5s ease;
    }

    .sol-card:hover .sol-img-ph img {
        transform: scale(1.05);
    }

    .sol-content {
        padding: 22px;
        display: flex;
        flex-direction: column;
        flex: 1;
    }

    .sol-tag {
        display: inline-block;
        align-self: flex-start;
        font-size: 0.75rem;
        color: var(--accent-blue);
        background: rgba(0, 113, 227, 0.08);
        padding: 4px 10px;
        border-radius: 6px;
        margin-bottom: 12px;
        font-weight: 600;
    }

    .sol-title {
        font-size: 1.15rem;
        color: var(--text-main);
        margin-bottom: 12px;
        font-weight: 800;
        line-height: 1.4;
        transition: color 0.3s;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .sol-card:hover .sol-title {
        color: var(--accent-blue);
    }

    .sol-excerpt {
        font-size: 0.9rem;
        color: #666;
        line-height: 1.6;
        text-align: justify;
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    
    .sol-keywords {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-top: auto;
        padding-top: 15px;
    }

    .sol-keywords span {
        font-size: 0.75rem;
        color: #888;
        background: #F9F9F9;
        border: 1px solid #E5E5EA;
        padding: 3px 8px;
        border-radius: 4px;
        font-weight: 500;
        transition: all 0.3s ease;
    }

    .sol-card:hover .sol-keywords span {
        color: var(--accent-blue);
        border-color: rgba(0, 113, 227, 0.2);
        background: rgba(0, 113, 227, 0.05);
    }

    
    .senu-modal {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.6);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        z-index: 100000;
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        visibility: hidden;
        transition: 0.3s ease;
        padding: 20px;
    }

    .senu-modal.active {
        opacity: 1;
        visibility: visible;
    }

    .contact-modal-content {
        background: #FFF;
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
        border-radius: 24px;
        padding: 40px;
        text-align: center;
        color: var(--text-main);
        transform: translateY(30px);
        transition: 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        width: 100%;
        max-width: 650px;
        position: relative;
    }

    .senu-modal.active .contact-modal-content {
        transform: translateY(0);
    }

    .modal-close-icon {
        position: absolute;
        top: 20px;
        right: 25px;
        font-size: 1.5rem;
        color: #888;
        cursor: pointer;
        transition: 0.3s;
    }

    .modal-close-icon:hover {
        color: #333;
    }

    .cm-title {
        font-size: 1.6rem;
        font-weight: 800;
        margin-bottom: 10px;
        color: var(--text-main);
    }

    .cm-subtitle {
        font-size: 1rem;
        color: #666;
        margin-bottom: 30px;
    }

    .cm-direct-contact {
        background: #F5F5F7;
        padding: 20px;
        border-radius: 16px;
        margin-bottom: 30px;
        display: flex;
        justify-content: space-around;
        gap: 15px;
        flex-wrap: wrap;
    }

    .dc-item {
        text-align: left;
        flex: 1;
    }

    .dc-label {
        font-size: 0.85rem;
        color: #888;
        font-weight: 600;
        margin-bottom: 5px;
    }

    .dc-value {
        font-size: 1rem;
        color: var(--accent-blue);
        font-weight: 800;
        /* display: flex; */
    }

    .qr-matrix {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 15px;
    }

    .qr-card {
        border: 1px solid #E5E5EA;
        padding: 15px 10px;
        border-radius: 16px;
        transition: 0.3s;
    }

    .qr-card:hover {
        border-color: var(--accent-blue);
        box-shadow: 0 5px 15px rgba(0, 113, 227, 0.1);
        transform: translateY(-3px);
    }

    .qr-img img{
        width: 100%;
        aspect-ratio: 1/1;
        background: #FAFAFA;
        border: 1px dashed #CCC;
        border-radius: 8px;
        margin-bottom: 10px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.8rem;
        color: #AAA;
    }

    .qr-name {
        font-size: 0.9rem;
        font-weight: 600;
        color: #333;
    }

    .footer-bottom {
        padding: 40px 0;
        border-top: 1px solid var(--border-color);
        color: #888;
        font-size: 0.85rem;
        text-align: center;
        margin-top: 20px;
    }

    
    @media (max-width: 1100px) {
        .solutions-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (max-width: 900px) {
        .layout-container {
            flex-direction: column;
            padding: 0;
            margin-top: 80px;
            gap: 20px;
        }

        .page-header {
            margin-top: 80px;
        }

        .sidebar-toc {
            display: none;
        }

        .main-content {
            width: 100%;
            padding: 0 5%;
        }

        .solutions-grid {
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .qr-matrix {
            grid-template-columns: repeat(2, 1fr);
        }
    }