/* ── Shared nestable base ── */
#ie_tree_wrapper .dd { max-width: 100%; }
#ie_tree_wrapper .dd-empty { display: none; }
#ie_tree_wrapper .dd-item > button[data-action="collapse"] { display: none; }

#ie_tree_wrapper .ie-dd-handle {
    cursor: move;
    transition: border-color .15s, background .15s, box-shadow .15s, transform .12s;
    height: auto !important;
}
#ie_tree_wrapper .ie-dd-handle.ie-node-selected {
    outline: 2px solid #3c8dbc;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(60,141,188,.12);
}
#ie_tree_wrapper .ie-node-actions .btn i { pointer-events: none; }

/* ── Theme picker ── */
.ie-theme-picker { margin-bottom: 14px; }
.ie-theme-picker-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 10px 14px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border: 1px solid #dde2e8;
    border-radius: 8px;
    cursor: pointer;
    text-align: right;
}
.ie-theme-picker-toggle:hover { background: linear-gradient(135deg, #eef2f6 0%, #e8edf3 100%); }
.ie-theme-default-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 8px 10px;
    margin: 10px 0 4px;
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: 6px;
    font-size: 12px;
}
.ie-theme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
    gap: 10px;
    padding: 12px 0 4px;
    max-height: 420px;
    overflow-y: auto;
}
.ie-theme-card {
    position: relative;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    padding: 10px 8px 8px;
    cursor: pointer;
    background: #fff;
    transition: border-color .15s, box-shadow .15s, transform .12s;
}
.ie-theme-card:hover { border-color: #3c8dbc; box-shadow: 0 4px 14px rgba(60,141,188,.18); transform: translateY(-1px); }
.ie-theme-card.active { border-color: #3c8dbc; background: #eef6fc; box-shadow: 0 0 0 1px #3c8dbc; }
.ie-theme-card.is-default { border-color: #f59e0b; }
.ie-theme-card.is-default.active { box-shadow: 0 0 0 1px #f59e0b, 0 4px 14px rgba(245,158,11,.15); }
.ie-theme-pin {
    position: absolute;
    top: 6px;
    left: 6px;
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    background: rgba(255,255,255,.9);
    border-radius: 50%;
    color: #cbd5e1;
    font-size: 12px;
    line-height: 24px;
    z-index: 2;
    box-shadow: 0 1px 3px rgba(0,0,0,.08);
}
.ie-theme-pin:hover { color: #f59e0b; background: #fff; }
.ie-theme-card.is-default .ie-theme-pin { color: #f59e0b; }
.ie-theme-default-badge {
    display: none;
    position: absolute;
    top: 6px;
    right: 6px;
    font-size: 9px;
    font-weight: 700;
    padding: 2px 5px;
    border-radius: 4px;
    background: #f59e0b;
    color: #fff;
}
.ie-theme-card.is-default .ie-theme-default-badge { display: block; }
.ie-theme-card-name { font-size: 11px; font-weight: 600; margin-bottom: 6px; color: #334155; line-height: 1.3; min-height: 28px; }
.ie-theme-preview {
    height: 52px;
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    background: #f8fafc;
}
.ie-theme-preview .pv-row {
    height: 14px;
    margin-bottom: 3px;
    border-radius: 3px;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 5px;
}
.ie-theme-preview .pv-indent-1 { margin-right: 8px; }
.ie-theme-preview .pv-indent-2 { margin-right: 16px; }
.ie-theme-preview .pv-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.ie-theme-preview .pv-bar { height: 5px; border-radius: 3px; flex: 1; }

/* preview skins */
.pv-classic .pv-row { background: #fafafa; border: 1px solid #d1d5db; }
.pv-card .pv-row { background: #fff; border: 1px solid #d8dee6; box-shadow: 0 1px 2px rgba(0,0,0,.06); }
.pv-card .pv-row:first-child { border-right: 3px solid #3c8dbc; }
.pv-minimal .pv-row { background: #fff; border-bottom: 1px solid #eee; border-radius: 0; }
.pv-industrial .pv-row { background: #ececec; border-right: 4px solid #444; }
.pv-striped .pv-row:nth-child(odd) { background: #f1f5f9; }
.pv-striped .pv-row:nth-child(even) { background: #fff; }
.pv-compact .pv-row { height: 11px; margin-bottom: 2px; background: #f1f5f9; }
.pv-color .pv-row:nth-child(1) { background: #e8f4fc; }
.pv-color .pv-row:nth-child(2) { background: #e8f8ee; }
.pv-color .pv-row:nth-child(3) { background: #f3e8fc; }
.pv-orgchart { background: #f8fafc; }
.pv-orgchart .pv-row { background: #fff; border: 1px solid #cbd5e1; }
.pv-orgchart .pv-indent-1::before, .pv-orgchart .pv-indent-2::before {
    content: ''; position: absolute; right: 2px; top: 0; width: 2px; height: 100%; background: #94a3b8;
}
.pv-blueprint { background: #1e3a5f; background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px); background-size: 8px 8px; }
.pv-blueprint .pv-row { background: rgba(37,99,235,.25); border: 1px solid #60a5fa; }
.pv-gradient .pv-row:nth-child(1) { background: linear-gradient(90deg, #6366f1, #8b5cf6); opacity: .85; }
.pv-gradient .pv-row:nth-child(2) { background: linear-gradient(90deg, #8b5cf6, #a855f7); opacity: .7; }
.pv-gradient .pv-row:nth-child(3) { background: linear-gradient(90deg, #a855f7, #ec4899); opacity: .55; }
.pv-neon { background: #0f172a; }
.pv-neon .pv-row { background: #1e293b; border: 1px solid #00f5d4; box-shadow: 0 0 6px rgba(0,245,212,.3); }
.pv-glass { background: linear-gradient(135deg, #e2e8f0, #f8fafc); }
.pv-glass .pv-row { background: rgba(255,255,255,.55); border: 1px solid rgba(255,255,255,.8); backdrop-filter: blur(4px); }
.pv-pastel .pv-row:nth-child(1) { background: #fecdd3; }
.pv-pastel .pv-row:nth-child(2) { background: #bbf7d0; }
.pv-pastel .pv-row:nth-child(3) { background: #bfdbfe; }
.pv-timeline { background: #f0f9ff; }
.pv-timeline .pv-row { background: #fff; border-right: 3px solid #0ea5e9; }
.pv-material .pv-row { background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.12); }
.pv-branch { background: #f0fdf4; }
.pv-branch .pv-row { background: #fff; border: 1px solid #86efac; }
.pv-aurora { background: linear-gradient(135deg, #1e1b4b, #312e81); }
.pv-aurora .pv-row { background: rgba(255,255,255,.1); border: 1px solid rgba(124,58,237,.5); }
.pv-indented { background: #f8fafc; }
.pv-indented .pv-row { background: #fff; border: 1px solid #d8dee6; box-shadow: 0 1px 2px rgba(0,0,0,.04); }
.pv-indented .pv-indent-1 { margin-right: 10px; border-right: 2px solid #3c8dbc; }
.pv-indented .pv-indent-2 { margin-right: 20px; border-right: 2px solid #00a65a; }

/* ── Tree connector mixin (themes 8, 14, 16) ── */
.ie-tree-theme-8 .dd-item,
.ie-tree-theme-14 .dd-item,
.ie-tree-theme-16 .dd-item { position: relative; }
.ie-tree-theme-8 .dd-list .dd-list,
.ie-tree-theme-14 .dd-list .dd-list,
.ie-tree-theme-16 .dd-list .dd-list {
    border-right: 2px solid #cbd5e1;
    margin-right: 14px;
    padding-right: 16px;
    position: relative;
}
.ie-tree-theme-8 .dd-list .dd-list > .dd-item::before,
.ie-tree-theme-14 .dd-list .dd-list > .dd-item::before,
.ie-tree-theme-16 .dd-list .dd-list > .dd-item::before {
    content: '';
    position: absolute;
    right: -18px;
    top: 26px;
    width: 14px;
    height: 2px;
    background: #94a3b8;
    z-index: 0;
}
.ie-tree-theme-14 .dd-list .dd-list { border-right-color: #38bdf8; }
.ie-tree-theme-14 .dd-list .dd-list > .dd-item::before { background: #38bdf8; }
.ie-tree-theme-16 .dd-list .dd-list { border-right-color: #4ade80; }
.ie-tree-theme-16 .dd-list .dd-list > .dd-item::before { background: #4ade80; border-radius: 0 0 0 4px; }

/* ══ THEME 1 — Enhanced Classic ══ */
.ie-tree-theme-1 .dd-list { padding-right: 26px; }
.ie-tree-theme-1 .dd-item { margin-bottom: 4px; }
.ie-tree-theme-1 .ie-dd-handle {
    padding: 10px 12px;
    background: linear-gradient(180deg, #fafafa, #f3f4f6);
    border: 1px solid #d1d5db;
    border-right: 3px solid #3c8dbc;
    border-radius: 6px;
    box-shadow: 0 1px 2px rgba(0,0,0,.04);
}
.ie-tree-theme-1 .ie-dd-handle:hover { background: #f0f7ff; border-color: #93c5fd; }
.ie-tree-theme-1 .ie-node-row { display: flex; align-items: center; min-height: 40px; }
.ie-tree-theme-1 .ie-node-drag { display: none; }
.ie-tree-theme-1 .ie-node-body { flex: 1; padding: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.ie-tree-theme-1 .ie-node-title { display: flex; align-items: center; gap: 6px; }
.ie-tree-theme-1 .ie-node-title strong { font-size: 13px; }
.ie-tree-theme-1 .ie-node-meta { display: flex; gap: 5px; font-size: 11px; }
.ie-tree-theme-1 .ie-node-meta code { background: #e5e7eb; padding: 1px 5px; border-radius: 3px; }
.ie-tree-theme-1 .ie-node-actions {
    display: flex; flex-direction: row; gap: 2px;
    border: none; background: transparent; padding: 0 0 0 8px;
}
.ie-tree-theme-1 .ie-node-actions-row { display: flex; gap: 2px; }
.ie-tree-theme-1 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; font-size: 11px; }

/* ══ THEME 2 — Card Pro ══ */
.ie-tree-theme-2 .dd-list { padding-right: 28px; }
.ie-tree-theme-2 .dd-item { margin-bottom: 8px; }
.ie-tree-theme-2 .ie-dd-handle {
    padding: 0;
    background: #fff;
    border: 1px solid #d8dee6;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,.05), 0 1px 2px rgba(0,0,0,.03);
    min-height: 54px;
}
.ie-tree-theme-2 .ie-dd-handle:hover {
    background: #f8fbff;
    border-color: #3c8dbc;
    box-shadow: 0 4px 12px rgba(60,141,188,.15);
    transform: translateY(-1px);
}
.ie-tree-theme-2 .ie-node-row { display: flex; align-items: stretch; min-height: 54px; }
.ie-tree-theme-2 .ie-node-drag {
    display: flex; align-items: center; justify-content: center;
    width: 30px; flex-shrink: 0;
    background: linear-gradient(180deg, #f8fafc, #f1f5f9);
    border-left: 1px solid #e8ecf0;
    border-radius: 8px 0 0 8px; color: #94a3b8; cursor: grab; font-size: 12px;
}
.ie-tree-theme-2 .ie-node-body {
    flex: 1 1 auto; min-width: 0; padding: 9px 12px;
    display: flex; flex-direction: column; justify-content: center; gap: 4px;
}
.ie-tree-theme-2 .ie-node-title { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; }
.ie-tree-theme-2 .ie-node-title strong { font-size: 13px; word-break: break-word; }
.ie-tree-theme-2 .ie-node-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 5px; font-size: 11px; }
.ie-tree-theme-2 .ie-node-meta code { background: #f0f3f6; padding: 2px 6px; border-radius: 4px; font-size: 11px; }
.ie-tree-theme-2 .ie-node-actions {
    display: flex; flex-direction: column; justify-content: center; gap: 3px;
    padding: 6px 8px; flex-shrink: 0;
    border-right: 1px solid #e8ecf0; background: #fafbfc;
    border-radius: 0 8px 8px 0;
}
.ie-tree-theme-2 .ie-node-actions-row { display: flex; gap: 3px; justify-content: flex-end; }
.ie-tree-theme-2 .ie-node-actions .btn {
    width: 28px; height: 28px; padding: 0;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 5px; font-size: 12px;
}
.ie-tree-theme-2 .dd-item > .dd-list > .dd-item > .ie-dd-handle { border-right: 4px solid #3c8dbc; }
.ie-tree-theme-2 .dd-item > .dd-list > .dd-item > .dd-list > .dd-item > .ie-dd-handle { border-right: 4px solid #00a65a; }
.ie-tree-theme-2 .dd-item > .dd-list > .dd-item > .dd-list > .dd-item > .dd-list > .dd-item > .ie-dd-handle { border-right: 4px solid #f39c12; }

/* ══ THEME 3 — Clean Minimal ══ */
.ie-tree-theme-3 .dd-list { padding-right: 20px; }
.ie-tree-theme-3 .dd-item { margin-bottom: 0; }
.ie-tree-theme-3 .ie-dd-handle {
    padding: 0; background: #fff; border: none;
    border-bottom: 1px solid #e5e7eb; border-radius: 0;
    box-shadow: none; min-height: 46px;
}
.ie-tree-theme-3 .ie-dd-handle:hover { background: #f9fafb; }
.ie-tree-theme-3 .ie-node-row { display: flex; align-items: center; min-height: 46px; }
.ie-tree-theme-3 .ie-node-drag { display: none; }
.ie-tree-theme-3 .ie-node-body {
    flex: 1; padding: 8px 10px;
    display: flex; flex-direction: row; align-items: center; flex-wrap: wrap; gap: 10px;
}
.ie-tree-theme-3 .ie-node-title { display: flex; align-items: center; gap: 8px; }
.ie-tree-theme-3 .ie-node-title strong { font-weight: 600; color: #1e293b; }
.ie-tree-theme-3 .ie-node-title::before {
    content: ''; width: 6px; height: 6px; border-radius: 50%;
    background: #3c8dbc; flex-shrink: 0;
}
.ie-tree-theme-3 .ie-node-meta { display: flex; gap: 8px; font-size: 11px; color: #64748b; }
.ie-tree-theme-3 .ie-node-meta code { background: none; color: #475569; }
.ie-tree-theme-3 .ie-node-type { background: none !important; color: #3c8dbc !important; border: 1px solid #93c5fd !important; }
.ie-tree-theme-3 .ie-node-actions {
    display: flex; flex-direction: row; gap: 2px;
    border: none; background: transparent; padding: 4px 8px;
}
.ie-tree-theme-3 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; font-size: 11px; opacity: .6; }
.ie-tree-theme-3 .ie-dd-handle:hover .ie-node-actions .btn { opacity: 1; }

/* ══ THEME 4 — Industrial Metal ══ */
.ie-tree-theme-4 .dd-list { padding-right: 24px; }
.ie-tree-theme-4 .dd-item { margin-bottom: 5px; }
.ie-tree-theme-4 .ie-dd-handle {
    padding: 0;
    background: linear-gradient(180deg, #ececec 0%, #d8d8d8 100%);
    border: 1px solid #a8a8a8;
    border-right: 5px solid #374151;
    border-radius: 3px;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.6), 0 1px 2px rgba(0,0,0,.1);
    min-height: 50px;
}
.ie-tree-theme-4 .ie-dd-handle:hover { background: linear-gradient(180deg, #e4e4e4, #d0d0d0); }
.ie-tree-theme-4 .ie-node-row { display: flex; align-items: stretch; min-height: 50px; }
.ie-tree-theme-4 .ie-node-drag {
    display: flex; align-items: center; justify-content: center;
    width: 26px; background: #b8b8b8; color: #444; font-size: 11px;
    border-left: 1px solid #999;
}
.ie-tree-theme-4 .ie-node-body { flex: 1; padding: 7px 10px; display: flex; flex-direction: column; justify-content: center; gap: 3px; }
.ie-tree-theme-4 .ie-node-title strong { font-family: Tahoma, sans-serif; font-size: 13px; letter-spacing: .2px; }
.ie-tree-theme-4 .ie-node-meta code { font-family: Consolas, monospace; background: #c4c4c4; font-size: 11px; padding: 1px 4px; }
.ie-tree-theme-4 .ie-node-actions {
    display: flex; flex-direction: column; justify-content: center; gap: 2px;
    padding: 4px 6px; background: #b8b8b8; border-right: 1px solid #999;
}
.ie-tree-theme-4 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; border-radius: 2px; }
.ie-tree-theme-4 .dd-item > .dd-list > .dd-item > .ie-dd-handle { border-right-color: #3c8dbc; }
.ie-tree-theme-4 .dd-item > .dd-list > .dd-item > .dd-list > .dd-item > .ie-dd-handle { border-right-color: #00a65a; }
.ie-tree-theme-4 .dd-item > .dd-list > .dd-item > .dd-list > .dd-item > .dd-list > .dd-item > .ie-dd-handle { border-right-color: #f39c12; }

/* ══ THEME 5 — Striped Table ══ */
.ie-tree-theme-5 .dd-list { padding-right: 24px; }
.ie-tree-theme-5 .dd-item { margin-bottom: 0; }
.ie-tree-theme-5 .dd-list > .dd-item:nth-child(odd) > .ie-dd-handle { background: #f1f5f9; }
.ie-tree-theme-5 .dd-list > .dd-item:nth-child(even) > .ie-dd-handle { background: #fff; }
.ie-tree-theme-5 .ie-dd-handle {
    padding: 0; border: 1px solid #e2e8f0; border-radius: 0;
    box-shadow: none; min-height: 48px;
}
.ie-tree-theme-5 .ie-dd-handle:hover { background: #e0f2fe !important; }
.ie-tree-theme-5 .ie-node-row { display: flex; align-items: center; min-height: 48px; }
.ie-tree-theme-5 .ie-node-drag { display: none; }
.ie-tree-theme-5 .ie-node-body {
    flex: 1; display: grid;
    grid-template-columns: minmax(120px, 1fr) minmax(80px, auto) minmax(60px, auto);
    align-items: center; gap: 8px; padding: 7px 12px;
}
.ie-tree-theme-5 .ie-node-title { display: flex; align-items: center; gap: 6px; }
.ie-tree-theme-5 .ie-node-meta { display: contents; }
.ie-tree-theme-5 .ie-node-meta code { grid-column: 2; background: #e2e8f0; padding: 2px 6px; border-radius: 3px; }
.ie-tree-theme-5 .ie-qty { grid-column: 3; text-align: center; color: #64748b; font-weight: 600; }
.ie-tree-theme-5 .ie-node-meta .label-success { display: none; }
.ie-tree-theme-5 .ie-node-actions {
    display: flex; flex-direction: row; flex-wrap: wrap; gap: 2px;
    padding: 4px 8px; border: none; background: transparent; max-width: 160px;
}
.ie-tree-theme-5 .ie-node-actions .btn { width: 24px; height: 24px; padding: 0; font-size: 10px; }

/* ══ THEME 6 — Compact Fast ══ */
.ie-tree-theme-6 .dd-list { padding-right: 16px; }
.ie-tree-theme-6 .dd-item { margin-bottom: 2px; }
.ie-tree-theme-6 .ie-dd-handle {
    padding: 0; background: #f8fafc; border: 1px solid #e2e8f0;
    border-radius: 4px; min-height: 34px; box-shadow: none;
}
.ie-tree-theme-6 .ie-dd-handle:hover { background: #f1f5f9; border-color: #cbd5e1; }
.ie-tree-theme-6 .ie-node-row { display: flex; align-items: center; min-height: 34px; }
.ie-tree-theme-6 .ie-node-drag { display: none; }
.ie-tree-theme-6 .ie-node-body {
    flex: 1; padding: 3px 8px;
    display: flex; flex-direction: row; align-items: center;
    flex-wrap: wrap; gap: 4px;
}
.ie-tree-theme-6 .ie-node-title strong { font-size: 12px; }
.ie-tree-theme-6 .ie-node-type { font-size: 9px !important; padding: 1px 4px !important; }
.ie-tree-theme-6 .ie-node-meta { font-size: 10px; gap: 3px; display: flex; }
.ie-tree-theme-6 .ie-node-meta code { font-size: 10px; padding: 0 3px; background: #e2e8f0; }
.ie-tree-theme-6 .ie-node-actions {
    display: flex; flex-direction: row; gap: 1px;
    padding: 2px 4px; border: none; background: transparent;
}
.ie-tree-theme-6 .ie-node-actions .btn { width: 22px; height: 22px; padding: 0; font-size: 10px; border-radius: 3px; }

/* ══ THEME 7 — Color by Type ══ */
.ie-tree-theme-7 .dd-list { padding-right: 24px; }
.ie-tree-theme-7 .dd-item { margin-bottom: 5px; }
.ie-tree-theme-7 .ie-dd-handle {
    padding: 0; border: 1px solid rgba(0,0,0,.06); border-radius: 8px;
    min-height: 50px; box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.ie-tree-theme-7 .dd-item[data-item-type="assembly"] > .ie-dd-handle { background: linear-gradient(135deg, #dbeafe, #e8f4fc); border-color: #93c5fd; }
.ie-tree-theme-7 .dd-item[data-item-type="subassembly"] > .ie-dd-handle { background: linear-gradient(135deg, #d1fae5, #e8f8ee); border-color: #6ee7b7; }
.ie-tree-theme-7 .dd-item[data-item-type="device"] > .ie-dd-handle { background: linear-gradient(135deg, #ede9fe, #f3e8fc); border-color: #c4b5fd; }
.ie-tree-theme-7 .dd-item[data-item-type="part"] > .ie-dd-handle { background: #fff; border-color: #e5e7eb; }
.ie-tree-theme-7 .dd-item[data-item-type="tool"] > .ie-dd-handle { background: #fffbeb; border-color: #fcd34d; }
.ie-tree-theme-7 .dd-item[data-item-type="consumable"] > .ie-dd-handle { background: #fef2f2; border-color: #fca5a5; }
.ie-tree-theme-7 .ie-node-row { display: flex; align-items: center; min-height: 50px; }
.ie-tree-theme-7 .ie-node-drag { display: none; }
.ie-tree-theme-7 .ie-node-body { flex: 1; padding: 8px 12px; display: flex; flex-direction: column; gap: 4px; }
.ie-tree-theme-7 .ie-node-title { display: flex; align-items: center; gap: 6px; }
.ie-tree-theme-7 .ie-node-meta { display: flex; flex-wrap: wrap; gap: 5px; font-size: 11px; }
.ie-tree-theme-7 .ie-node-actions {
    display: flex; flex-direction: column; justify-content: center; gap: 2px;
    padding: 6px; border: none; background: rgba(255,255,255,.6);
    border-radius: 8px 0 0 8px;
}
.ie-tree-theme-7 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; }

/* ══ THEME 8 — Org Chart ══ */
.ie-tree-theme-8 .dd-list { padding-right: 8px; }
.ie-tree-theme-8 .dd-item { margin-bottom: 8px; }
.ie-tree-theme-8 .ie-dd-handle {
    padding: 0; background: #fff; border: 2px solid #cbd5e1;
    border-radius: 8px; min-height: 48px;
    box-shadow: 0 2px 6px rgba(0,0,0,.06);
}
.ie-tree-theme-8 .ie-dd-handle:hover { border-color: #3b82f6; box-shadow: 0 4px 12px rgba(59,130,246,.15); }
.ie-tree-theme-8 .ie-node-row { display: flex; align-items: center; min-height: 48px; }
.ie-tree-theme-8 .ie-node-drag { display: none; }
.ie-tree-theme-8 .ie-node-body { flex: 1; padding: 8px 12px; }
.ie-tree-theme-8 .ie-node-title strong { color: #1e293b; }
.ie-tree-theme-8 .ie-node-actions { display: flex; gap: 2px; padding: 6px 8px; background: #f8fafc; border-radius: 8px 0 0 8px; }
.ie-tree-theme-8 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; }

/* ══ THEME 9 — Blueprint ══ */
.ie-tree-theme-9 {
    background: #1e3a5f;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size: 20px 20px;
    border-radius: 8px;
    padding: 12px;
}
.ie-tree-theme-9 .dd-list { padding-right: 24px; }
.ie-tree-theme-9 .dd-item { margin-bottom: 6px; }
.ie-tree-theme-9 .ie-dd-handle {
    padding: 0; background: rgba(37,99,235,.15);
    border: 1px solid #60a5fa; border-radius: 4px;
    min-height: 48px; color: #e0f2fe;
    box-shadow: inset 0 0 20px rgba(96,165,250,.1);
}
.ie-tree-theme-9 .ie-dd-handle:hover { background: rgba(37,99,235,.25); border-color: #93c5fd; }
.ie-tree-theme-9 .ie-node-row { display: flex; align-items: center; min-height: 48px; }
.ie-tree-theme-9 .ie-node-drag { display: none; }
.ie-tree-theme-9 .ie-node-body { flex: 1; padding: 8px 12px; }
.ie-tree-theme-9 .ie-node-title strong { color: #f0f9ff; }
.ie-tree-theme-9 .ie-node-meta { color: #93c5fd; }
.ie-tree-theme-9 .ie-node-meta code { background: rgba(0,0,0,.2); color: #bae6fd; }
.ie-tree-theme-9 .ie-node-type { background: #2563eb !important; border: none !important; }
.ie-tree-theme-9 .ie-node-actions { padding: 6px; }
.ie-tree-theme-9 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; opacity: .9; }

/* ══ THEME 10 — Depth Gradient ══ */
.ie-tree-theme-10 .dd-list { padding-right: 24px; }
.ie-tree-theme-10 .dd-item { margin-bottom: 6px; }
.ie-tree-theme-10 .ie-dd-handle {
    padding: 0; border: none; border-radius: 8px;
    min-height: 48px; color: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,.12);
}
.ie-tree-theme-10 .dd-list > .dd-item > .ie-dd-handle { background: linear-gradient(135deg, #6366f1, #8b5cf6); }
.ie-tree-theme-10 .dd-list .dd-list > .dd-item > .ie-dd-handle { background: linear-gradient(135deg, #8b5cf6, #a855f7); }
.ie-tree-theme-10 .dd-list .dd-list .dd-list > .dd-item > .ie-dd-handle { background: linear-gradient(135deg, #a855f7, #ec4899); }
.ie-tree-theme-10 .dd-list .dd-list .dd-list .dd-list > .dd-item > .ie-dd-handle { background: linear-gradient(135deg, #ec4899, #f43f5e); }
.ie-tree-theme-10 .ie-node-row { display: flex; align-items: center; min-height: 48px; }
.ie-tree-theme-10 .ie-node-drag { display: none; }
.ie-tree-theme-10 .ie-node-body { flex: 1; padding: 8px 12px; }
.ie-tree-theme-10 .ie-node-title strong { color: #fff; }
.ie-tree-theme-10 .ie-node-meta { color: rgba(255,255,255,.85); }
.ie-tree-theme-10 .ie-node-meta code { background: rgba(0,0,0,.2); color: #fff; }
.ie-tree-theme-10 .ie-node-type { background: rgba(255,255,255,.2) !important; border: 1px solid rgba(255,255,255,.4) !important; color: #fff !important; }
.ie-tree-theme-10 .ie-node-actions { padding: 6px; }
.ie-tree-theme-10 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; }

/* ══ THEME 11 — Dark Neon ══ */
.ie-tree-theme-11 {
    background: #0f172a;
    border-radius: 8px;
    padding: 12px;
}
.ie-tree-theme-11 .dd-list { padding-right: 24px; }
.ie-tree-theme-11 .dd-item { margin-bottom: 8px; }
.ie-tree-theme-11 .ie-dd-handle {
    padding: 0; background: #1e293b;
    border: 1px solid #00f5d4; border-radius: 6px;
    min-height: 48px;
    box-shadow: 0 0 12px rgba(0,245,212,.15), inset 0 0 20px rgba(0,245,212,.03);
}
.ie-tree-theme-11 .ie-dd-handle:hover {
    border-color: #7b2ff7;
    box-shadow: 0 0 16px rgba(123,47,247,.3);
}
.ie-tree-theme-11 .dd-item[data-item-type="assembly"] > .ie-dd-handle { border-color: #00f5d4; }
.ie-tree-theme-11 .dd-item[data-item-type="subassembly"] > .ie-dd-handle { border-color: #7b2ff7; }
.ie-tree-theme-11 .dd-item[data-item-type="device"] > .ie-dd-handle { border-color: #f72585; }
.ie-tree-theme-11 .ie-node-row { display: flex; align-items: center; min-height: 48px; }
.ie-tree-theme-11 .ie-node-drag { display: none; }
.ie-tree-theme-11 .ie-node-body { flex: 1; padding: 8px 12px; }
.ie-tree-theme-11 .ie-node-title strong { color: #f1f5f9; }
.ie-tree-theme-11 .ie-node-meta { color: #94a3b8; }
.ie-tree-theme-11 .ie-node-meta code { background: #334155; color: #00f5d4; }
.ie-tree-theme-11 .ie-node-actions { padding: 6px; }
.ie-tree-theme-11 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; }

/* ══ THEME 12 — Glass ══ */
.ie-tree-theme-12 {
    background: linear-gradient(135deg, #e2e8f0 0%, #f8fafc 50%, #e0e7ff 100%);
    border-radius: 10px;
    padding: 12px;
}
.ie-tree-theme-12 .dd-list { padding-right: 24px; }
.ie-tree-theme-12 .dd-item { margin-bottom: 8px; }
.ie-tree-theme-12 .ie-dd-handle {
    padding: 0;
    background: rgba(255,255,255,.55);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,.7);
    border-radius: 10px;
    min-height: 50px;
    box-shadow: 0 4px 16px rgba(0,0,0,.06);
}
.ie-tree-theme-12 .ie-dd-handle:hover {
    background: rgba(255,255,255,.75);
    box-shadow: 0 6px 20px rgba(0,0,0,.1);
}
.ie-tree-theme-12 .ie-node-row { display: flex; align-items: center; min-height: 50px; }
.ie-tree-theme-12 .ie-node-drag { display: none; }
.ie-tree-theme-12 .ie-node-body { flex: 1; padding: 8px 12px; }
.ie-tree-theme-12 .ie-node-actions {
    padding: 6px 8px;
    background: rgba(255,255,255,.4);
    border-radius: 10px 0 0 10px;
}
.ie-tree-theme-12 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; }

/* ══ THEME 13 — Soft Pastel ══ */
.ie-tree-theme-13 .dd-list { padding-right: 24px; }
.ie-tree-theme-13 .dd-item { margin-bottom: 8px; }
.ie-tree-theme-13 .ie-dd-handle {
    padding: 0; border: none; border-radius: 20px;
    min-height: 48px;
    box-shadow: 0 2px 8px rgba(0,0,0,.06);
}
.ie-tree-theme-13 .dd-list > .dd-item:nth-child(3n+1) > .ie-dd-handle { background: #fecdd3; }
.ie-tree-theme-13 .dd-list > .dd-item:nth-child(3n+2) > .ie-dd-handle { background: #bbf7d0; }
.ie-tree-theme-13 .dd-list > .dd-item:nth-child(3n) > .ie-dd-handle { background: #bfdbfe; }
.ie-tree-theme-13 .ie-node-row { display: flex; align-items: center; min-height: 48px; }
.ie-tree-theme-13 .ie-node-drag { display: none; }
.ie-tree-theme-13 .ie-node-body { flex: 1; padding: 8px 14px; }
.ie-tree-theme-13 .ie-node-type { border-radius: 12px !important; }
.ie-tree-theme-13 .ie-node-actions { padding: 6px 10px; }
.ie-tree-theme-13 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; border-radius: 50%; }

/* ══ THEME 14 — Vertical Timeline ══ */
.ie-tree-theme-14 .dd-list { padding-right: 8px; }
.ie-tree-theme-14 .dd-item { margin-bottom: 10px; }
.ie-tree-theme-14 .ie-dd-handle {
    padding: 0; background: #fff;
    border: 1px solid #e0f2fe; border-right: 4px solid #0ea5e9;
    border-radius: 0 8px 8px 0;
    min-height: 48px;
    box-shadow: 0 2px 6px rgba(14,165,233,.1);
}
.ie-tree-theme-14 .ie-dd-handle:hover { border-right-color: #0284c7; background: #f0f9ff; }
.ie-tree-theme-14 .dd-list > .dd-item > .ie-dd-handle::before {
    content: '';
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #0ea5e9;
    border: 3px solid #fff;
    box-shadow: 0 0 0 2px #0ea5e9;
    z-index: 1;
}
.ie-tree-theme-14 .dd-item > .ie-dd-handle { position: relative; }
.ie-tree-theme-14 .ie-node-row { display: flex; align-items: center; min-height: 48px; }
.ie-tree-theme-14 .ie-node-drag { display: none; }
.ie-tree-theme-14 .ie-node-body { flex: 1; padding: 8px 12px; }
.ie-tree-theme-14 .ie-node-actions { padding: 6px 8px; }
.ie-tree-theme-14 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; }

/* ══ THEME 15 — Material Design ══ */
.ie-tree-theme-15 .dd-list { padding-right: 24px; }
.ie-tree-theme-15 .dd-item { margin-bottom: 10px; }
.ie-tree-theme-15 .ie-dd-handle {
    padding: 0; background: #fff;
    border: none; border-radius: 4px;
    min-height: 52px;
    box-shadow: 0 2px 4px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
}
.ie-tree-theme-15 .ie-dd-handle:hover {
    box-shadow: 0 6px 16px rgba(0,0,0,.12), 0 2px 4px rgba(0,0,0,.08);
    transform: translateY(-2px);
}
.ie-tree-theme-15 .ie-node-row { display: flex; align-items: stretch; min-height: 52px; }
.ie-tree-theme-15 .ie-node-drag {
    display: flex; align-items: center; justify-content: center;
    width: 4px; background: #1976d2; border-radius: 4px 0 0 4px;
}
.ie-tree-theme-15 .ie-node-body { flex: 1; padding: 10px 14px; display: flex; flex-direction: column; justify-content: center; gap: 4px; }
.ie-tree-theme-15 .ie-node-title strong { font-size: 14px; color: #212121; }
.ie-tree-theme-15 .ie-node-meta { font-size: 12px; color: #757575; }
.ie-tree-theme-15 .ie-node-actions {
    display: flex; flex-direction: column; justify-content: center; gap: 4px;
    padding: 8px; background: #fafafa;
}
.ie-tree-theme-15 .ie-node-actions .btn { width: 28px; height: 28px; padding: 0; border-radius: 50%; }

/* ══ THEME 16 — Branch Tree ══ */
.ie-tree-theme-16 .dd-list { padding-right: 8px; }
.ie-tree-theme-16 .dd-item { margin-bottom: 6px; }
.ie-tree-theme-16 .ie-dd-handle {
    padding: 0; background: #f0fdf4;
    border: 1px solid #86efac; border-radius: 8px;
    min-height: 46px;
}
.ie-tree-theme-16 .ie-dd-handle:hover { background: #dcfce7; border-color: #4ade80; }
.ie-tree-theme-16 .ie-node-row { display: flex; align-items: center; min-height: 46px; }
.ie-tree-theme-16 .ie-node-drag { display: none; }
.ie-tree-theme-16 .ie-node-body { flex: 1; padding: 7px 12px; }
.ie-tree-theme-16 .ie-node-title strong { color: #14532d; }
.ie-tree-theme-16 .ie-node-type { background: #15803d !important; }
.ie-tree-theme-16 .ie-node-actions { padding: 6px 8px; }
.ie-tree-theme-16 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; }

/* ══ THEME 17 — Aurora ══ */
.ie-tree-theme-17 {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 40%, #1e3a5f 100%);
    border-radius: 10px;
    padding: 14px;
}
.ie-tree-theme-17 .dd-list { padding-right: 24px; }
.ie-tree-theme-17 .dd-item { margin-bottom: 8px; }
.ie-tree-theme-17 .ie-dd-handle {
    padding: 0;
    background: rgba(255,255,255,.08);
    border: 1px solid transparent;
    border-radius: 8px;
    min-height: 50px;
    background-clip: padding-box;
    position: relative;
    box-shadow: 0 2px 12px rgba(0,0,0,.2);
}
.ie-tree-theme-17 .ie-dd-handle::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 9px;
    background: linear-gradient(135deg, #7c3aed, #06b6d4, #f472b6);
    z-index: -1;
}
.ie-tree-theme-17 .ie-dd-handle:hover {
    background: rgba(255,255,255,.12);
    box-shadow: 0 4px 20px rgba(124,58,237,.3);
}
.ie-tree-theme-17 .ie-node-row { display: flex; align-items: center; min-height: 50px; position: relative; z-index: 1; }
.ie-tree-theme-17 .ie-node-drag { display: none; }
.ie-tree-theme-17 .ie-node-body { flex: 1; padding: 8px 12px; }
.ie-tree-theme-17 .ie-node-title strong { color: #f8fafc; }
.ie-tree-theme-17 .ie-node-meta { color: #c4b5fd; }
.ie-tree-theme-17 .ie-node-meta code { background: rgba(0,0,0,.3); color: #a5f3fc; }
.ie-tree-theme-17 .ie-node-type { background: rgba(124,58,237,.6) !important; border: none !important; }
.ie-tree-theme-17 .ie-node-actions { padding: 6px 8px; }
.ie-tree-theme-17 .ie-node-actions .btn { width: 26px; height: 26px; padding: 0; }

/* ── Clipboard bar ── */
.ie-clipboard-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding: 8px 12px;
    margin-bottom: 10px;
    background: #eff6ff;
    border: 1px dashed #3b82f6;
    border-radius: 6px;
    font-size: 12px;
}

/* ── Indented tree base (all themes) ── */
.ie-tree-indented .dd-list { padding-right: 0; }
.ie-tree-indented .dd-list .dd-list {
    margin-right: 32px;
    padding-right: 6px;
    border-right: 2px solid #dbeafe;
    position: relative;
}
.ie-tree-indented .dd-item { margin-bottom: 6px; position: relative; }
.ie-tree-indented .dd-list .dd-list > .dd-item::before {
    content: '';
    position: absolute;
    right: -34px;
    top: 22px;
    width: 20px;
    height: 2px;
    background: #93c5fd;
    z-index: 0;
}

/* Toggle button */
.ie-btn-toggle-branch,
.ie-toggle-spacer {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    background: #f8fafc;
    color: #475569;
    font-size: 12px;
    padding: 0;
    cursor: pointer;
    margin-left: 6px;
}
.ie-btn-toggle-branch:hover { background: #e2e8f0; border-color: #94a3b8; color: #1e293b; }
.ie-toggle-spacer { border: none; background: transparent; cursor: default; }

/* ══ THEME 18 — Indented Pro ══ */
.ie-tree-theme-18 .dd-item { margin-bottom: 8px; }
.ie-tree-theme-18 .ie-dd-handle {
    padding: 0;
    background: #fff;
    border: 1px solid #d8dee6;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0,0,0,.05);
    min-height: 48px;
}
.ie-tree-theme-18 .ie-dd-handle:hover {
    border-color: #3c8dbc;
    box-shadow: 0 2px 8px rgba(60,141,188,.12);
}
.ie-tree-theme-18 .ie-node-row {
    display: flex;
    align-items: center;
    min-height: 48px;
}
.ie-tree-theme-18 .ie-node-drag {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    color: #94a3b8;
    font-size: 11px;
    flex-shrink: 0;
    cursor: grab;
}
.ie-tree-theme-18 .ie-node-body {
    flex: 1;
    min-width: 0;
    padding: 6px 10px;
    display: flex;
    flex-direction: column;
    gap: 3px;
}
.ie-tree-theme-18 .ie-node-title {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}
.ie-tree-theme-18 .ie-node-title strong { font-size: 13px; color: #1e293b; }
.ie-tree-theme-18 .ie-qty { color: #64748b; font-size: 12px; font-weight: 600; }
.ie-tree-theme-18 .ie-node-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    font-size: 11px;
}
.ie-tree-theme-18 .ie-node-meta code {
    background: #fee2e2;
    color: #b91c1c;
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 11px;
}
.ie-tree-theme-18 .ie-node-actions {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 3px;
    padding: 4px 6px;
    flex-shrink: 0;
    border-right: 1px solid #eef2f6;
    background: #fafbfc;
    border-radius: 6px 0 0 6px;
}
.ie-tree-theme-18 .ie-node-actions-row { display: flex; gap: 3px; justify-content: flex-end; }
.ie-tree-theme-18 .ie-node-actions .btn {
    width: 28px;
    height: 28px;
    padding: 0;
    border-radius: 5px;
    font-size: 12px;
}
.ie-tree-theme-18 .dd-item[data-item-type="device"] > .ie-dd-handle { border-right: 3px solid #3c8dbc; }
.ie-tree-theme-18 .dd-item[data-item-type="assembly"] > .ie-dd-handle,
.ie-tree-theme-18 .dd-item[data-item-type="subassembly"] > .ie-dd-handle { border-right: 3px solid #00a65a; }
.ie-tree-theme-18 .dd-list .dd-list { border-right-color: #93c5fd; }
.ie-tree-theme-18 .dd-list .dd-list .dd-list { border-right-color: #86efac; }

@media (max-width: 768px) {
    .ie-theme-grid { grid-template-columns: repeat(2, 1fr); max-height: 360px; }
    .ie-theme-default-bar { flex-direction: column; align-items: stretch; }
    .ie-tree-theme-2 .ie-node-row,
    .ie-tree-theme-4 .ie-node-row,
    .ie-tree-theme-15 .ie-node-row { flex-wrap: wrap; }
    .ie-tree-theme-2 .ie-node-actions,
    .ie-tree-theme-4 .ie-node-actions,
    .ie-tree-theme-15 .ie-node-actions {
        flex-direction: row; width: 100%;
        border-top: 1px solid #e8ecf0; border-right: none;
    }
    .ie-tree-theme-5 .ie-node-body { grid-template-columns: 1fr; }
    .ie-tree-theme-18 .ie-node-row { flex-wrap: wrap; }
    .ie-tree-theme-18 .ie-node-actions {
        flex-direction: row;
        width: 100%;
        border-top: 1px solid #eef2f6;
        border-right: none;
        border-radius: 0 0 6px 6px;
    }
    .ie-tree-indented .dd-list .dd-list { margin-right: 20px; }
}