:root {
  --bg: #f1f5f9;
  --panel: #ffffff;
  --border: #dbe2ea;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-soft: #dbeafe;
  --green: #16a34a;
  --green-soft: #dcfce7;
  --red: #dc2626;
  --red-soft: #fee2e2;
  --amber: #d97706;
  --amber-soft: #fef3c7;
  --shadow: 0 6px 24px rgba(15, 23, 42, 0.06);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.app { max-width: 1500px; margin: 0 auto; padding: 16px; }
.topbar, .actions-header { display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.topbar h1 { margin: 0; font-size: 30px; }
.topbar p { margin: 6px 0 0; color: var(--muted); }
.badges { display: flex; gap: 8px; flex-wrap: wrap; }
.badge {
  border: 1px solid var(--border);
  background: var(--panel);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 14px;
}
.badge.secondary { background: #eef2ff; }
.badge.outline { background: transparent; }
.actions-header { margin-top: 14px; margin-bottom: 14px; }
.layout { display: grid; grid-template-columns: 320px 1fr 360px; gap: 20px; }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 16px;
}
.panel h2 { margin: 0 0 14px; font-size: 20px; }
.levels-panel { max-height: 78vh; overflow: auto; }
.level-group-title { font-size: 13px; font-weight: bold; color: var(--muted); margin: 16px 0 8px; }
.level-btn {
  width: 100%; text-align: left; margin-bottom: 8px; border: 1px solid var(--border); border-radius: 14px;
  padding: 12px; background: #fff; cursor: pointer;
}
.level-btn.active { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 2px #bfdbfe; }
.level-btn small { display: block; color: var(--muted); margin-top: 4px; }
.diagram-wrap { overflow: auto; border: 1px solid var(--border); border-radius: 16px; padding: 10px; background: #fff; }
#diagram { min-width: 1080px; width: 100%; height: auto; display: block; }
.legend { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 10px; margin-top: 14px; }
.legend-item { border: 1px solid var(--border); background: white; border-radius: 12px; padding: 10px; font-size: 14px; }
.swatch { display:inline-block; width:20px; height:8px; margin-right:8px; border-radius:99px; vertical-align:middle; }
.swatch.phase { background:#dc2626; }
.swatch.neutre { background:#2563eb; }
.swatch.retour { background:#f97316; }
.swatch.terre { background:linear-gradient(90deg,#16a34a 0%,#16a34a 50%,#facc15 50%,#facc15 100%); }
.swatch.navette { background:#a855f7; }
.info-box, .warning-box, .success-box, .error-box, .lamp-box {
  border-radius: 16px; padding: 14px; margin-bottom: 14px; border: 1px solid var(--border);
}
.info-box { background: #f8fafc; color: #334155; }
.warning-box { background: var(--amber-soft); border-color: #fcd34d; color: #92400e; }
.success-box { background: var(--green-soft); border-color: #86efac; color: #166534; }
.error-box { background: var(--red-soft); border-color: #fca5a5; color: #991b1b; }
.hidden { display: none; }
.lamp-box { display:flex; gap:14px; align-items:center; background:#f8fafc; }
.lamp-box.on { background: #fffbeb; }
.lamp-icon { font-size: 34px; width: 56px; height: 56px; display:flex; align-items:center; justify-content:center; border-radius: 16px; background:#e2e8f0; }
.lamp-box.on .lamp-icon { background:#fde68a; }
.button-grid { display:grid; grid-template-columns:1fr 1fr; gap:10px; margin-bottom:14px; }
.btn {
  border: 1px solid var(--border); background: #fff; padding: 11px 14px; border-radius: 12px;
  cursor:pointer; font-weight: 600; color: var(--text);
}
.btn.primary { background: var(--primary); color: white; border-color: var(--primary); }
.btn.active { background: var(--primary); color: white; border-color: var(--primary); }
.connections-list { max-height: 340px; overflow:auto; display:flex; flex-direction:column; gap:10px; }
.connection-item { border:1px solid var(--border); border-radius:14px; background:white; padding:10px 12px; display:flex; gap:10px; align-items:center; justify-content:space-between; }
.connection-label { font-size: 14px; }
.connection-actions button { padding:8px 10px; font-size:13px; }
.node-label-bg { fill: rgba(255,255,255,.95); }
.group-box { fill:#f8fafc; stroke:#cbd5e1; }
.group-title { font-size:15px; font-weight:bold; fill:#0f172a; }
.node { cursor:pointer; }
.node text { user-select:none; }
@media (max-width: 1280px) {
  .layout { grid-template-columns: 1fr; }
  .levels-panel, .right-panel { max-height:none; }
}
@media (max-width: 900px) {
  .legend { grid-template-columns: 1fr 1fr; }
  .button-grid { grid-template-columns: 1fr; }
}