.scopus-categories-container {
        margin-top: 20px;
    }

    .scopus-categories-container .scopus-tabs {
        border-bottom: 1px solid #eceef1;
    }

    .scopus-categories-container .scopus-tabs>li>a {
        border: none;
        border-radius: 0;
        color: #8a8f98;
        font-weight: 500;
        padding: 8px 4px;
        margin-right: 22px;
        background: transparent;
        transition: color .15s ease;
    }

    .scopus-categories-container .scopus-tabs>li>a:hover {
        background: transparent;
        color: #444750;
    }

    .scopus-categories-container .scopus-tabs>li.active>a,
    .scopus-categories-container .scopus-tabs>li.active>a:hover,
    .scopus-categories-container .scopus-tabs>li.active>a:focus {
        background: transparent;
        color: #26282c;
        border: none;
    }

    /* ---- Existing widget styles ---- */
    .scopus-categories-container .scopus-chart {
        height: 450px;
        margin-top: 20px;
    }

    .scopus-categories-container .journal-note {
        margin-top: 20px;
        color: #777;
        font-size: 13px;
    }

    .scopus-categories-container .treemap-container {
        position: relative;
        width: 100%;
        height: 600px;
        margin-top: 10px;
        border-radius: 4px;
        overflow: hidden;
        background: #f5f5f5;
    }

    .scopus-categories-container .treemap-cell {
        position: absolute;
        box-sizing: border-box;
        border: 2px solid #fff;
        overflow: hidden;
        padding: 6px 8px;
        color: #fff;
        font-size: 12px;
        line-height: 1.35;
        cursor: default;
        transition: opacity .15s ease;
    }

    .scopus-categories-container .treemap-cell:hover {
        opacity: .85;
    }

    .scopus-categories-container .treemap-cell .tc-label {
        font-weight: 600;
        display: -webkit-box;
        -webkit-box-orient: vertical;
        overflow: hidden;
        word-break: break-word;
    }

    .scopus-categories-container .treemap-cell .tc-value {
        display: block;
        opacity: .9;
        margin-top: 2px;
    }

    .scopus-categories-container .treemap-others-badge {
        position: absolute;
        bottom: 10px;
        right: 10px;
        width: 150px;
        padding: 8px 10px;
        background: rgba(50, 50, 50, 0.85);
        color: #fff;
        border-radius: 4px;
        font-size: 11px;
        line-height: 1.4;
        box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
        cursor: default;
    }

    .scopus-categories-container .treemap-others-badge strong {
        display: block;
        font-size: 12px;
    }

    @media (max-width: 600px) {
        .scopus-collapse-header {
            padding: 16px;
        }
    }

    .scopus-collapse-header {
        display: flex;
        align-items: center;
        gap: 14px;
        background: #fff;
        border: 1px solid #e9edf2;
        border-radius: 12px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, .04);
        padding: 18px 22px;
        margin-bottom: 18px;
        cursor: pointer;
        user-select: none;
        transition: border-radius .2s ease;
    }

    .scopus-collapse-header:focus {
        outline: none;
        box-shadow: 0 0 0 3px rgba(66, 165, 245, .25);
    }

    .scopus-collapse-header.collapsed {
        margin-bottom: 0;
        border-radius: 12px;
    }

    .scopus-collapse-header-icon {
        width: 44px;
        height: 44px;
        min-width: 44px;
        border-radius: 10px;
        background: linear-gradient(135deg, #607D8B, #546E7A);
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 19px;
    }

    .scopus-collapse-header-text {
        flex: 1;
        min-width: 0;
    }

    .scopus-collapse-header-text h3 {
        margin: 0 0 4px;
        font-size: 19px;
        font-weight: 600;
        color: #263238;
    }

    .scopus-collapse-header-text p {
        margin: 0;
        font-size: 13px;
        color: #90a4ae;
    }

    .scopus-collapse-header-toggle {
        color: #90a4ae;
        font-size: 16px;
    }

    .scopus-collapse-chevron {
        display: inline-block;
        transition: transform .25s ease;
    }

    .scopus-collapse-header.collapsed .scopus-collapse-chevron {
        transform: rotate(-90deg);
    }

    .scopus-collapse-body {
        margin-top: -4px;
    }