/* ============================================================
   ConstructionGameTheory v2.1 — Main Stylesheet
   ============================================================ */

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --secondary: #0f172a;
  --accent: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --purple: #8b5cf6;
  --sidebar-w: 290px;
  --bg: #f1f5f9;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,.12);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
}

/* ---- SIDEBAR ---- */
.sidebar {
  width: var(--sidebar-w);
  background: var(--secondary);
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  overflow-y: auto;
  z-index: 100;
  transition: width .25s;
}
.sidebar-header {
  padding: 20px 16px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #1e293b;
}
.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  cursor: pointer;
  gap: 10px;
  color: #fff;
}
.logo i { color: var(--primary); font-size: 1.4rem; }
.logo-img {
  width: 44px !important;
  height: 44px !important;
  max-width: 44px !important;
  max-height: 44px !important;
  object-fit: contain;
  border-radius: 6px;
  flex-shrink: 0;
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo-line1 {
  font-size: 1.08rem;
  font-weight: 800;
  font-family: Arial, sans-serif;
  letter-spacing: .01em;
  color: #fff;
}
.logo-line2 {
  font-size: 1.08rem;
  font-weight: 800;
  font-family: Arial, sans-serif;
  color: var(--primary-light, #60a5fa);
  letter-spacing: .01em;
}
.version-badge {
  background: var(--primary);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
}
.user-role-switcher {
  padding: 10px 16px;
  border-bottom: 1px solid #1e293b;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .88rem;
}
.user-role-switcher label { color: #94a3b8; white-space: nowrap; }
.user-role-switcher select {
  flex: 1;
  background: #1e293b;
  color: #e2e8f0;
  border: 1px solid #334155;
  border-radius: 6px;
  padding: 4px 8px;
  font-size: .88rem;
}
.nav-menu { list-style: none; padding: 8px 0; flex: 1; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  cursor: pointer;
  border-radius: 0;
  transition: background .15s, color .15s;
  font-size: .95rem;
  color: #94a3b8;
}
.nav-item:hover { background: #1e293b; color: #e2e8f0; }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-item i { width: 18px; text-align: center; font-size: .95rem; }
.nav-divider { margin-top: 8px; border-top: 1px solid #1e293b; }
.sidebar-footer { padding: 12px 16px; border-top: 1px solid #1e293b; }
.confidence-widget { display: flex; flex-direction: column; gap: 4px; }
.conf-label { font-size: .82rem; color: #ffffff; text-transform: uppercase; letter-spacing: .05em; font-weight: 700; }
.conf-bar-wrap { background: #1e293b; border-radius: 4px; height: 6px; overflow: hidden; }
.conf-bar { height: 100%; background: var(--success); transition: width .4s; border-radius: 4px; }
.conf-pct { font-size: .84rem; font-weight: 600; color: #e2e8f0; text-align: right; }

/* ---- MAIN CONTENT ---- */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 28px 28px 40px;
  min-height: 100vh;
}
#pageContainer { max-width: 1400px; margin: 0 auto; }

/* ---- PAGE HEADERS ---- */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.page-title { font-size: 1.75rem; font-weight: 700; color: var(--text); }
.page-title span { color: var(--primary); }
.page-subtitle { font-size: .95rem; color: var(--text-muted); margin-top: 4px; }
.page-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---- CARDS ---- */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title i { color: var(--primary); }

/* ---- GRID UTILITIES ---- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .sidebar { width: 60px; }
  .sidebar span { display: none; }
  .main-content { margin-left: 60px; padding: 16px; }
}

/* ---- KPI CARDS ---- */
.kpi-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.kpi-label { font-size: .83rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-muted); font-weight: 600; }
.kpi-value { font-size: 1.9rem; font-weight: 700; color: var(--text); line-height: 1; }
.kpi-change { font-size: .85rem; color: var(--text-muted); }
.kpi-icon { font-size: 1.5rem; color: var(--primary); }
.kpi-row { display: flex; justify-content: space-between; align-items: flex-start; }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: .92rem;
  font-weight: 600;
  transition: all .15s;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-purple { background: var(--purple); color: #fff; }
.btn-sm { padding: 6px 13px; font-size: .84rem; }
.btn-lg { padding: 13px 26px; font-size: 1rem; }
.pdf-tool.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---- BADGES ---- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: .78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }
.badge-purple { background: #ede9fe; color: #5b21b6; }
.badge-neutral { background: #f1f5f9; color: #475569; }

/* ---- FORMS ---- */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: .9rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.form-control {
  width: 100%;
  padding: 10px 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .94rem;
  color: #475569;
  background: #fff;
  transition: border-color .15s;
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.form-hint { font-size: .82rem; color: var(--text-muted); margin-top: 4px; }

/* ---- RANGE SLIDERS ---- */
input[type=range] { -webkit-appearance: none; width: 100%; height: 6px; border-radius: 3px; background: var(--border); }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
}

/* ---- TABLES ---- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
thead th {
  background: var(--bg);
  color: var(--text-muted);
  font-weight: 600;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
tbody tr { border-bottom: 1px solid var(--border); transition: background .12s; }
tbody tr:hover { background: #f8fafc; }
tbody td { padding: 10px 14px; }

/* ---- RISK BADGE COLORS ---- */
.risk-critical { color: #991b1b; font-weight: 700; }
.risk-high { color: #ef4444; font-weight: 600; }
.risk-medium { color: #f59e0b; font-weight: 600; }
.risk-low { color: #10b981; font-weight: 600; }

/* ---- PROGRESS BARS ---- */
.progress { height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.progress-bar { height: 100%; border-radius: 4px; transition: width .4s; }
.progress-bar.green { background: var(--success); }
.progress-bar.yellow { background: var(--warning); }
.progress-bar.red { background: var(--danger); }
.progress-bar.blue { background: var(--primary); }

/* ---- TOOLTIPS ---- */
[data-tooltip] { position: relative; cursor: help; }
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #0f172a;
  color: #e2e8f0;
  font-size: .82rem;
  padding: 6px 10px;
  border-radius: 6px;
  white-space: pre-wrap;
  max-width: 280px;
  width: max-content;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  z-index: 999;
  text-align: left;
  line-height: 1.5;
}
[data-tooltip]:hover::after { opacity: 1; }

/* ---- CHARTS ---- */
.chart-wrap { position: relative; }
.chart-container { height: 300px; }
.chart-container-lg { height: 380px; }

/* ---- NASH BANNER ---- */
.nash-banner {
  background: linear-gradient(135deg, #1d4ed8, #0f172a);
  color: #fff;
  border-radius: var(--radius);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}
.nash-banner-icon { font-size: 2rem; opacity: .8; }
.nash-banner-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 4px; }
.nash-banner-text { font-size: .92rem; opacity: .85; }
.nash-banner-badge {
  margin-left: auto;
  background: rgba(255,255,255,.15);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .84rem;
  font-weight: 700;
  white-space: nowrap;
}

/* ---- SCENARIO CARDS ---- */
.scenario-card {
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: all .2s;
  position: relative;
}
.scenario-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.scenario-card.recommended { border-color: var(--success); }
.scenario-card.recommended::before {
  content: '★ Recommended';
  position: absolute;
  top: -1px; right: 12px;
  background: var(--success);
  color: #fff;
  font-size: .76rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 0 0 6px 6px;
}

/* ---- TIMELINE ---- */
.timeline { display: flex; flex-direction: column; gap: 0; }
.timeline-item { display: flex; gap: 14px; padding: 12px 0; border-left: 2px solid var(--border); margin-left: 10px; padding-left: 18px; position: relative; }
.timeline-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--primary);
  position: absolute;
  left: -8px;
  top: 16px;
  border: 2px solid #fff;
}
.timeline-item.risk-high .timeline-dot { background: var(--danger); }
.timeline-item.risk-medium .timeline-dot { background: var(--warning); }
.timeline-item.risk-low .timeline-dot { background: var(--success); }
.timeline-label { font-size: .9rem; font-weight: 600; color: var(--text); }
.timeline-desc { font-size: .85rem; color: var(--text-muted); margin-top: 2px; }

/* ---- FACTOR BARS (Prediction breakdown) ---- */
.factor-list { display: flex; flex-direction: column; gap: 10px; }
.factor-row { display: flex; align-items: center; gap: 10px; }
.factor-name { font-size: .88rem; color: var(--text); min-width: 160px; }
.factor-bar-wrap { flex: 1; background: var(--border); border-radius: 4px; height: 10px; overflow: hidden; }
.factor-bar { height: 100%; border-radius: 4px; }
.factor-value { font-size: .88rem; font-weight: 600; color: var(--text); min-width: 36px; text-align: right; }

/* ---- PAYOFF MATRIX ---- */
.payoff-matrix { border-collapse: collapse; font-size: .92rem; }
.payoff-matrix td, .payoff-matrix th { padding: 12px 18px; border: 1px solid var(--border); text-align: center; }
.payoff-matrix thead { background: var(--bg); font-weight: 700; }
.payoff-matrix .nash { background: #dbeafe; font-weight: 700; color: var(--primary); }
.payoff-matrix .pareto { background: #d1fae5; font-weight: 700; color: var(--success); }

/* ---- FAQ ---- */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 18px;
  cursor: pointer;
  font-weight: 600;
  font-size: .97rem;
  background: var(--card-bg);
  transition: background .15s;
}
.faq-question:hover { background: var(--bg); }
.faq-answer { padding: 14px 18px; background: #f8fafc; font-size: 1.84rem; line-height: 1.7; color: #334155; display: none; }
.faq-answer.open { display: block; }

/* ---- WORKSHOP MODE ---- */
.participant-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: .88rem;
  font-weight: 600;
}
.participant-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); }

/* ---- MODAL ---- */
.modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 200;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 540px;
  width: 90%;
  box-shadow: var(--shadow-md);
}
.modal-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 16px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

/* ---- TOAST ---- */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 300; display: flex; flex-direction: column; gap: 8px; }
.toast {
  background: var(--secondary);
  color: #e2e8f0;
  padding: 13px 18px;
  border-radius: 8px;
  font-size: .92rem;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn .25s ease;
  max-width: 320px;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.info { border-left: 3px solid var(--accent); }
@keyframes slideIn { from { transform: translateX(40px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ---- CONFIDENCE SCORE CARD ---- */
.confidence-score-card {
  background: linear-gradient(135deg, #0f172a, #1e3a5f);
  color: #fff;
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.conf-circle {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: conic-gradient(var(--success) 0%, transparent 0%);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; font-weight: 700;
  flex-shrink: 0;
}
.conf-details h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 4px; }
.conf-details p { font-size: .9rem; opacity: .8; line-height: 1.5; }

/* ---- HEATMAP ---- */
.heatmap-grid { display: grid; gap: 4px; }
.heatmap-cell {
  width: 40px; height: 40px;
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  font-size: .78rem; font-weight: 700; color: #fff;
  cursor: default;
}
.heat-1 { background: #fef9c3; color: #713f12; }
.heat-2 { background: #fef08a; color: #713f12; }
.heat-3 { background: #fbbf24; color: #fff; }
.heat-4 { background: #f97316; color: #fff; }
.heat-5 { background: #dc2626; color: #fff; }

/* ---- ML STATUS BANNER ---- */
.ml-banner {
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .94rem;
}
.ml-banner.early { background: #fef3c7; color: #92400e; }
.ml-banner.growing { background: #dbeafe; color: #1e40af; }
.ml-banner.mature { background: #d1fae5; color: #065f46; }

/* ---- SECTION DIVIDER ---- */
.section-divider { display: flex; align-items: center; gap: 12px; margin: 24px 0 18px; }
.section-divider::before, .section-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.section-divider-label { font-size: .82rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text-muted); white-space: nowrap; }

/* ---- UPLOAD ZONE ---- */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: all .2s;
  cursor: pointer;
}
.upload-zone:hover { border-color: var(--primary); background: var(--primary-light); }
.upload-zone i { font-size: 2rem; color: var(--primary); margin-bottom: 12px; display: block; }
.upload-zone p { color: var(--text-muted); font-size: .94rem; }

/* ---- INLINE FORM PANEL ---- */
.inline-form-panel {
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  background: var(--card-bg);
  padding: 20px 24px;
  margin-bottom: 22px;
  box-shadow: 0 4px 16px rgba(37,99,235,.1);
  animation: panelIn .18s ease;
}
@keyframes panelIn { from { opacity:0; transform: translateY(-8px); } to { opacity:1; transform:none; } }
.inline-form-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.inline-form-footer { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }

/* ---- PRINT STYLES ---- */
@media print {
  .sidebar, .page-actions, .btn { display: none !important; }
  .main-content { margin-left: 0; padding: 0; }
  .card { box-shadow: none; border: 1px solid #ccc; page-break-inside: avoid; }
}

/* ============================================================
   BIM Viewer — Left Panel & Hierarchy Tree
   ============================================================ */

/* Left panel container */
.bim-left-panel {
  width: 240px;
  min-width: 240px;
  background: var(--card-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width .2s ease, min-width .2s ease;
}
.bim-left-panel.collapsed {
  width: 0;
  min-width: 0;
  border-right: none;
}

/* Model type selector buttons */
.bim-type-btn {
  padding: 5px 10px;
  border: none;
  border-radius: 4px;
  font-size: .82rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.bim-type-btn:hover { background: var(--primary-light); color: var(--primary); }
.bim-type-btn.active { background: var(--primary); color: #fff; }

/* Model list row */
.bim-model-row {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 6px;
  border-radius: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  min-width: 0;
}
.bim-model-row:hover { background: var(--primary-light); }

/* Model type badge */
.bim-model-type-badge {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
  color: #fff;
  white-space: nowrap;
  flex-shrink: 0;
  text-transform: uppercase;
  letter-spacing: .04em;
}

/* Delete button */
.bim-delete-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  padding: 3px 6px;
  border-radius: 4px;
  font-size: .82rem;
  flex-shrink: 0;
  transition: color .15s, background .15s;
}
.bim-delete-btn:hover { color: #ef4444; background: #fee2e2; }

/* Hierarchy tree */
.bim-tree-node { user-select: none; }
.bim-tree-row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 7px;
  border-radius: 5px;
  cursor: pointer;
  font-size: .84rem;
  transition: background .12s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.bim-tree-row:hover { background: var(--primary-light); color: var(--primary); }
.bim-tree-row.selected { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.bim-tree-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  font-size: .78rem;
  font-weight: 700;
  font-family: monospace;
  color: var(--primary);
  border: 1.5px solid var(--primary);
  border-radius: 2px;
  flex-shrink: 0;
  line-height: 1;
  user-select: none;
  margin-right: 4px;
}
.bim-tree-chevron {
  display: inline-block;
  width: 14px;
  height: 14px;
  line-height: 14px;
  text-align: center;
  font-size: .72rem;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform .15s;
}
.bim-tree-node.open > .bim-tree-row .bim-tree-chevron { transform: rotate(90deg); }
.bim-tree-badge {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  padding: 0 6px;
  border-radius: 10px;
  background: var(--border);
  color: var(--text-muted);
  flex-shrink: 0;
}
.bim-tree-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bim-tree-children {
  padding-left: 14px;
  display: none;
}
.bim-tree-node.open > .bim-tree-children { display: block; }