:root {
    /* Layout */
    --po-sidebar-width: 52px;
    /* Core surfaces */
    --header: #111827;
    --mainbars: #1F2937;
    --page-bg: #F3F4F6;
    --card-bg: #FFFFFF;
    --surface-light: #F9FAFB;
    --hover-bg: #F9FAFB;
    /* Text */
    --lighttext: #FFFFFF;
    --darktext: #111827;
    --text-muted: #6B7280;
    --icon-colour: #374151;
    /* Brand / interaction */
    --accent: #4F7CAC;
    --accent-hover: #3F668F;
    --buttonhigh: var(--accent);
    --buttonhover: var(--accent-hover);
    --buttonoff: #D1D5DB;
    /* Borders */
    --border-soft: #E5E7EB;
    --grid-row-border: #F1F5F9;
    --grid-header-border: #CBD5E1;
    --grid-edit-border: #94A3B8;
    /* Grid surfaces */
    --subprimary: #F8FAFC;
    --subsecondary: #EEF2F7;
    --actual: #F8FAFC;
    --expanded: #E8EEF5;
    --totalrow: #D5DEE8;
    /* Status colours */
    --success: #4E7A5D;
    --warning: #C48B3A;
    --danger: #B94A48;
    /* Grid markers */
    --cutoff-line: #EF4444;
    --lock-line: #9CA3AF;
    --current-line: #2563EB;
    /* Sidebar */
    --sidebar-text: #D4D4D8;
    --sidebar-submenu: #1A1A1A;
    --sidebar-submenu-text: #B4B4B8;
    /* Resources */
    --resource-amber: #EDE4C8;
    --resource-red: #E6D3D3;
    /* Stage colours */
    --stage-band-a: #F8FAFC;
    --stage-band-b: #EEF2F7;
    /* Table colours */
    --po-black: #1f2328;
    --po-teal: #2b8c84;
    --po-teal-light: #f5faf9;
    --po-border: #e6eaed;
    --po-header-light: #f7f8f9;
    /* Grid */
    --pinned-column-bg: #EDF2F7;
    --pinned-column-hover-bg: #E3EAF2;
    --total-row-text: #0F5F57;
    --total-row-bg: var(--po-teal-light);
    --editable-cell-bg: #ffffff;
    --readonly-cell-bg: var(--subsecondary);
    --total-row-divider: rgba(43,140,132,0.25);
    --section-row-bg: #e8f4f2;
    /* Shadow */
    --shadow-sm: 0 2px 8px rgba(17,24,39,.06);
    --shadow-md: 0 12px 30px rgba(17,24,39,.10);
    --shadow-lg: 0 20px 50px rgba(17,24,39,.14);
}


.po-topbar-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.po-topbar-btn {
    height: 26px;
    padding: 2px 8px;
    font-size: 0.75rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    border: 1px solid var(--grid-edit-border);
    border-radius: 4px;
    background: var(--subprimary);
    color: var(--darktext);
    cursor: pointer;
}

    .po-topbar-btn:hover,
    .po-topbar-btn.is-open {
        background: var(--buttonhigh);
        border-color: var(--buttonhigh);
        color: var(--lighttext);
    }

.po-caret {
    font-size: 0.65rem;
    line-height: 1;
    display: inline-block;
    transform: translateY(1px);
}

.po-topbar-panel {
    position: fixed;
    z-index: 5000;
    min-width: 190px;
    max-width: 240px;
    background: var(--card-bg);
    border: 1px solid var(--border-soft);
    border-radius: 6px;
    box-shadow: 0 4px 14px var(--shadow-md);
    padding: 0;
    display: none;
    font-size: 0.76rem;
}

    .po-topbar-panel .panel-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 4px 7px;
        font-size: 0.75rem;
        font-weight: 500;
        color: var(--lighttext);
        background: var(--mainbars);
        border-bottom: 1px solid var(--grid-header-border);
    }

        .po-topbar-panel .panel-header button {
            border: 0;
            background: transparent;
            color: var(--lighttext);
            padding: 0 3px;
            line-height: 1;
            font-size: 1rem;
            cursor: pointer;
        }

    .po-topbar-panel .panel-body {
        padding: 4px;
        display: flex;
        flex-direction: column;
        gap: 2px;
    }

    .po-topbar-panel .btn-flyout {
        width: 100%;
        border: 0;
        background: transparent;
        text-align: left;
        padding: 4px 6px;
        font-size: 0.76rem;
        line-height: 1.15;
        border-radius: 4px;
        color: var(--darktext);
        cursor: pointer;
    }

        .po-topbar-panel .btn-flyout:hover {
            background: var(--expanded);
        }