.tool-hero {
        padding: 44px 0 8px;
    }

    .crumb {
        font-size: 13px;
        color: var(--muted);
        margin: 0 0 14px;
    }

    .crumb a {
        text-decoration: none;
        color: var(--muted);
    }

    .crumb a:hover {
        color: var(--ink);
    }

    .tool-sub {
        font-size: 16px;
        color: var(--muted);
        max-width: 60ch;
        margin: 0;
    }

    main {
        padding-bottom: 60px;
    }

    /* Upload dropzone */
    .dropzone {
        margin-top: 28px;
        border: 1.5px dashed var(--line);
        border-radius: 14px;
        background: var(--paper-raise);
        padding: 40px 24px;
        text-align: center;
        cursor: pointer;
        transition: border-color .15s ease, background .15s ease;
    }

    .dropzone.drag {
        border-color: var(--teal);
        background: var(--tag-bg);
    }

    .dropzone .dz-icon {
        font-size: 30px;
        margin-bottom: 10px;
    }

    .dropzone h3 {
        margin: 0 0 6px;
        font-size: 17px;
    }

    .dropzone p {
        margin: 0;
        color: var(--muted);
        font-size: 14px;
    }

    .dropzone input[type="file"] {
        display: none;
    }

    /* Status line while pages are being rendered / files exported */
    .status-line {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-top: 16px;
        font-size: 14px;
        color: var(--muted);
        min-height: 20px;
    }

    .spinner {
        width: 14px;
        height: 14px;
        border-radius: 50%;
        border: 2px solid var(--line);
        border-top-color: var(--teal);
        animation: spin .7s linear infinite;
        display: none;
    }

    .spinner.on {
        display: inline-block;
    }

    @keyframes spin {
        to {
            transform: rotate(360deg);
        }
    }

    /* Generic toolbar row (used above the groups list) */
    .section-toolbar {
        display: none;
        align-items: center;
        justify-content: space-between;
        gap: 14px;
        flex-wrap: wrap;
        margin-top: 34px;
    }

    .section-toolbar.on {
        display: flex;
    }

    .section-toolbar h2 {
        font-size: 19px;
        margin: 0;
    }

    .section-toolbar .hint {
        font-size: 13px;
        color: var(--muted);
        margin: 2px 0 0;
    }

    .toolbar-actions {
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
        align-items: center;
    }

    /* Sortable page grid — shared by the pool and every group */
    .page-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 14px;
        margin-top: 14px;
        padding: 0;
        list-style: none;
    }

    .page-card {
        background: var(--paper-raise);
        border: 1px solid var(--line);
        border-radius: 10px;
        padding: 10px;
        cursor: grab;
        position: relative;
        user-select: none;
    }

    .page-card:active {
        cursor: grabbing;
    }

    .page-card img {
        width: 100%;
        display: block;
        border-radius: 5px;
        border: 1px solid var(--line);
        background: #fff;
    }

    .page-card .pg-num {
        position: absolute;
        top: 16px;
        left: 16px;
        background: var(--ink);
        color: var(--paper);
        font-size: 11px;
        font-weight: 700;
        padding: 2px 7px;
        border-radius: 6px;
        font-family: 'IBM Plex Mono', monospace;
    }

    .page-card .pg-file {
        margin: 8px 2px 0;
        font-size: 11.5px;
        color: var(--muted);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .page-card.ui-sortable-placeholder {
        visibility: visible !important;
        background: var(--tag-bg);
        border: 1.5px dashed var(--line);
    }

    .page-card.ui-sortable-helper {
        box-shadow: 0 10px 24px rgba(20, 24, 31, .18);
    }

    /* "Add more PDFs" card at the end of the pool */
    .add-more-card {
        border: 1.5px dashed var(--line);
        border-radius: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 6px;
        min-height: 150px;
        cursor: pointer;
        color: var(--muted);
        background: transparent;
        font-family: inherit;
        font-size: 13px;
        font-weight: 700;
    }

    .add-more-card:hover {
        border-color: var(--teal);
        color: var(--teal-deep);
    }

    .add-more-card .plus {
        font-size: 22px;
        line-height: 1;
    }

    .add-more-card input[type="file"] {
        display: none;
    }

    .pool-heading {
        font-size: 14px;
        font-weight: 700;
        color: var(--ink-soft);
        margin: 26px 0 0;
    }

    /* "How many files?" panel */
    .split-settings {
        display: none;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        flex-wrap: wrap;
        margin-top: 34px;
        padding: 20px 22px;
        background: var(--paper-raise);
        border: 1px solid var(--line);
        border-radius: 14px;
    }

    .split-settings.on {
        display: flex;
    }

    .split-settings h2 {
        font-size: 17px;
        margin: 0 0 4px;
    }

    .split-settings .hint {
        font-size: 13px;
        color: var(--muted);
        margin: 0;
    }

    .split-settings-controls {
        display: flex;
        gap: 10px;
        align-items: center;
    }

    .split-settings-controls input[type="number"] {
        width: 74px;
        padding: 11px 12px;
        border: 1px solid var(--line);
        border-radius: 9px;
        font-size: 15px;
        background: #fff;
        color: var(--ink);
        text-align: center;
    }

    /* Output-file groups (2 per row, like col-md-6; 1 per row on small screens) */
    .groups-container {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
        margin-top: 20px;
    }

    .group-block {
        background: var(--paper-raise);
        border: 1px solid var(--line);
        border-radius: 14px;
        padding: 18px 20px;
    }

    .group-head {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        flex-wrap: wrap;
        margin-bottom: 4px;
    }

    .group-head h3 {
        margin: 0;
        font-size: 15.5px;
    }

    .group-filename {
        font-size: 12.5px;
        color: var(--muted);
        background: var(--tag-bg);
        padding: 3px 9px;
        border-radius: 6px;
    }

    .group-grid {
        min-height: 0;
    }

    .group-grid:empty {
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 100px;
        border: 1.5px dashed var(--line);
        border-radius: 10px;
        margin-top: 14px;
    }

    .group-grid:empty::after {
        content: "Drag pages here";
        color: var(--muted);
        font-size: 13px;
    }

    /* Export results list */
    .result-box {
        display: none;
        margin-top: 30px;
        background: var(--teal-deep);
        color: #F4F2EA;
        border-radius: 16px;
        padding: 26px 28px;
        flex-direction: column;
        gap: 16px;
    }

    .result-box.on {
        display: flex;
    }

    .result-box h3 {
        margin: 0 0 2px;
        color: #fff;
        font-size: 18px;
    }

    .result-box .result-sub {
        margin: 0;
        color: #D9E4DF;
        font-size: 14px;
    }

    .result-files {
        display: grid;
        gap: 10px;
    }

    .result-file-row {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        flex-wrap: wrap;
        background: rgba(255, 255, 255, .08);
        border: 1px solid rgba(255, 255, 255, .16);
        border-radius: 10px;
        padding: 12px 16px;
    }

    .result-file-row .rf-name {
        font-size: 14px;
        font-weight: 700;
        color: #fff;
    }

    .result-file-row .rf-meta {
        font-size: 12.5px;
        color: #B9E3D6;
        margin-left: 8px;
    }

    .result-file-row .btn-light {
        padding: 8px 16px;
        font-size: 13.5px;
    }

    .result-actions {
        display: flex;
        justify-content: flex-end;
    }

    /* Responsive tweaks for the new elements */
    @media (max-width:640px) {
        .page-grid {
            grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        }

        .split-settings {
            flex-direction: column;
            align-items: flex-start;
        }

        .groups-container {
            grid-template-columns: 1fr;
        }
    }