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solid var(--border-soft);border-radius:10px;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);color:var(--text-main);font-weight:700;font-size:.92rem;box-shadow:0 1px 2px #00000005;position:relative;overflow:hidden;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.tree-learner-btn:hover{background:var(--surface-muted);border-color:var(--brand-slate-300);transform:translateY(-1px)}.tree-learner-btn.expanded{background:linear-gradient(to right,#f8fafc,#fff);border-color:var(--brand-blue-500);box-shadow:0 4px 6px -1px #0000000d}.tree-learner-btn.expanded:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--brand-blue-500)}.tree-chevron{margin-right:10px;font-size:.75rem;color:var(--text-muted);transition:transform .3s ease;display:grid;place-items:center;width:16px;height:16px}.tree-learner-btn.expanded .tree-chevron{transform:rotate(90deg);color:var(--brand-blue-500)}.tree-learner-name{flex:1;text-align:left}.tree-count-badge{background:var(--brand-slate-100);color:var(--text-muted);font-size:.75rem;padding:2px 8px;border-radius:99px;font-weight:700}.tree-children{margin-left:18px;margin-top:6px;margin-bottom:8px;padding-left:12px;border-left:2px solid var(--border-soft);display:flex;flex-direction:column;gap:4px;animation:slide-down .2s ease-out}.tree-session-item{display:flex;align-items:flex-start;gap:10px;width:100%;padding:8px 10px;background:transparent;border:1px solid transparent;border-radius:8px;cursor:pointer;text-align:left;transition:all .15s;color:var(--text-soft);position:relative}.tree-session-item:hover{background:var(--surface-muted);border-color:var(--border-soft);color:var(--brand-blue-400);box-shadow:var(--shadow-sm)}.tree-session-item.active-now{background:linear-gradient(90deg,#ebf8ff,#f0f9ff);color:var(--brand-blue-700);border-color:#4299e166;font-weight:600}.tree-session-item.selected{background:#ebf8ff;border-color:var(--brand-blue-500);color:var(--brand-blue-700)}.tree-session-item.selected:after{content:"●";position:absolute;right:10px;top:50%;transform:translateY(-50%);font-size:.6rem;color:var(--brand-blue-500)}.tree-session-icon{font-size:.95rem;margin-top:1px;opacity:.7}.tree-session-item:hover .tree-session-icon{opacity:1;transform:scale(1.1);transition:transform .2s}.tree-session-info{display:flex;flex-direction:column;gap:2px}.tree-session-time{font-size:.84rem;line-height:1.35;font-family:JetBrains Mono,monospace;font-variant-numeric:tabular-nums;letter-spacing:-.02em}.status-indicator{font-size:.65rem;color:#48bb78;font-weight:800;text-transform:uppercase;letter-spacing:.05em;background:#48bb781a;padding:4px 8px;border-radius:4px;display:inline-block;margin-top:4px;align-self:flex-start}.role-toggle-widget{position:fixed;bottom:24px;left:24px;background:var(--surface-panel);border:1px solid var(--border-strong);border-radius:999px;padding:8px;display:flex;align-items:center;gap:12px;box-shadow:var(--shadow-xl);z-index:1000;animation:slide-up .3s ease-out;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.role-indicator{font-size:.7rem;font-weight:800;padding:6px 14px;border-radius:999px;text-transform:uppercase;letter-spacing:.06em}.role-indicator.rbt{background:#94a3b826;color:#94a3b8}.role-indicator.bcba{background:#4299e126;color:#63b3ed}.role-switch-btn{border:none;background:var(--brand-blue-500);color:#fff;font-size:.75rem;font-weight:800;padding:6px 16px;border-radius:999px;cursor:pointer;transition:all .2s}.role-switch-btn:hover{transform:translateY(-1px);background:var(--brand-blue-600);box-shadow:0 4px 12px #4299e14d}@keyframes slide-up{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}