:root{--bg: #f0f4f8;--card: #ffffff;--card-2: #f8fafc;--card-hover: #f1f5f9;--border: #e2e8f0;--border-2: #f1f5f9;--text: #0f172a;--text-2: #334155;--muted: #64748b;--muted-2: #94a3b8;--primary: #2563eb;--primary-hover: #1d4ed8;--primary-light: #dbeafe;--primary-dark: #1e40af;--accent: #f59e0b;--accent-light: #fef3c7;--success: #16a34a;--success-light: #dcfce7;--warning: #d97706;--warning-light: #fef3c7;--danger: #dc2626;--danger-light: #fee2e2;--purple: #7c3aed;--purple-light: #ede9fe;--teal: #0d9488;--teal-light: #ccfbf1;--sidebar: #0f172a;--sidebar-text: #cbd5e1;--sidebar-muted: #475569;--sidebar-active-bg: rgba(37,99,235,.15);--sidebar-active-text: #93c5fd;--sidebar-active-border:#3b82f6;--sidebar-hover-bg: rgba(255,255,255,.06);--shadow-xs: 0 1px 2px rgba(15,23,42,.04);--shadow-sm: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);--shadow: 0 4px 16px rgba(15,23,42,.07), 0 2px 6px rgba(15,23,42,.04);--shadow-lg: 0 12px 40px rgba(15,23,42,.12), 0 4px 12px 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0}hr.soft{border:none;border-top:1px solid var(--border-2);margin:16px 0}.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.section-title h3,.section-title h4{margin:0;font-size:15px;font-weight:700;color:var(--text)}.empty-state{padding:48px 24px;text-align:center;color:var(--muted);border:1.5px dashed var(--border);border-radius:var(--radius);background:var(--card-2)}.empty-state-icon{font-size:36px;margin-bottom:12px;opacity:.5;line-height:1}.empty-state h4{margin:0 0 6px;font-size:15px;color:var(--text-2)}.empty-state p{margin:0;font-size:13px;color:var(--muted)}.split-layout{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}.hub-layout{display:grid;grid-template-columns:360px 1fr;gap:0;height:calc(100vh - var(--topbar-h) - 48px);background:var(--card);border:1px solid var(--border);border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-sm)}.hub-list{border-right:1px solid 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