:root {
    --dense-font: 12px;
    --dense-pad-y: .15rem;
    --dense-pad-x: .35rem;
    --row-h: 26px;
    --head-h: 28px;
    --gap: .5rem;
    --border: 1px solid #dee2e6;
}

.page-wrap {
    display: flex;
    gap: var(--gap);
    height: calc(100vh - 100px); /* adjust for your header/footer */
    overflow: hidden;
}

.pane-left {
    width: 48rem; /* tight, but readable; change if needed */
    min-width: 40rem; /* prevent collapsing too far */
    display: flex;
    flex-direction: column;
    gap: var(--gap);
    overflow: hidden;
}

.pane-right {
    flex: 1;
    min-width: 20rem;
    overflow: hidden;
}

.section {
    border: var(--border);
    border-radius: .25rem;
    background: #fff;
    display: flex;
    flex-direction: column;
    min-height: 0; /* allow child overflow scroll */
}

.section-header {
    height: var(--head-h);
    display: flex;
    align-items: center;
    padding: 0 var(--dense-pad-x);
    gap: .5rem;
    border-bottom: var(--border);
    font-weight: 600;
    font-size: var(--dense-font);
    background: #f8f9fa;
}

.section-body {
    padding: 0;
    overflow: auto; /* each section scrolls independently */
}

/* dense controls */
.dense .form-control, .dense .btn, .dense input, .dense select {
    padding: var(--dense-pad-y) var(--dense-pad-x) !important;
    font-size: var(--dense-font) !important;
    height: calc(var(--row-h)) !important;
}

.dense .btn {
    line-height: 1;
}

/* compact datagrid */
.compact-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: var(--dense-font);
    table-layout: fixed; /* enables ellipsis */
}

    .compact-table thead th {
        position: sticky;
        top: 0;
        z-index: 1;
        background: #f1f3f5;
        height: var(--head-h);
        padding: 0 var(--dense-pad-x);
        border-bottom: var(--border);
        text-overflow: ellipsis;
        overflow: hidden;
        white-space: nowrap;
    }

    .compact-table tbody td {
        height: var(--row-h);
        padding: 0 var(--dense-pad-x);
        border-bottom: var(--border);
        text-overflow: ellipsis;
        overflow: hidden;
        white-space: nowrap;
    }

    .compact-table tbody tr:hover {
        background: #f8f9fa;
    }

    .compact-table tbody tr.selected {
        background: #e7f1ff;
    }

/* tiny utility for narrow columns */
.col-40 {
    width: 40px;
}

.col-60 {
    width: 60px;
}

.col-80 {
    width: 80px;
}

.col-120 {
    width: 120px;
}

.col-160 {
    width: 160px;
}

.text-right {
    text-align: right;
}

/* iframe fills right pane */
.browser-wrap {
    height: 100%;
    border: var(--border);
    border-radius: .25rem;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

    .browser-wrap .browser-head {
        height: var(--head-h);
        display: flex;
        align-items: center;
        gap: .5rem;
        padding: 0 var(--dense-pad-x);
        background: #f8f9fa;
        border-bottom: var(--border);
        font-size: var(--dense-font);
    }

    .browser-wrap iframe {
        border: 0;
        width: 100%;
        height: 100%;
    }