*{box-sizing:border-box;margin:0;padding:0}:root{--primary-color:#3b82f6;--primary-dark:#2563eb;--primary-light:#60a5fa;--secondary-color:#6366f1;--success-color:#10b981;--warning-color:#f59e0b;--error-color:#ef4444;--info-color:#06b6d4;--text-primary:#1f2937;--text-secondary:#6b7280;--text-muted:#9ca3af;--bg-primary:#fff;--bg-secondary:#f9fafb;--bg-tertiary:#f3f4f6;--border-color:#e5e7eb;--border-light:#f3f4f6;--sidebar-bg:#1e293b;--sidebar-hover:#334155;--sidebar-active:#3b82f6;--shadow-sm:0 1px 2px 0 #0000000d;--shadow:0 1px 3px 0 #0000001a,0 1px 2px -1px #0000001a;--shadow-md:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a,0 4px 6px -4px 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var(--border-color);border-radius:.5rem;border-radius:var(--radius);flex-direction:column;height:300px}.chart-placeholder-icon{font-size:3rem;margin-bottom:1rem;margin-bottom:var(--spacing);opacity:.5}.chart-placeholder-text{color:#6b7280;color:var(--text-secondary);font-size:1.125rem;font-weight:600;margin-bottom:.5rem;margin-bottom:var(--spacing-sm)}.chart-placeholder-subtitle{color:#9ca3af;color:var(--text-muted);font-size:.875rem}.activity-section{background:#fff;background:var(--bg-primary);border-radius:1rem;border-radius:var(--radius-lg);box-shadow:0 1px 3px 0 #0000001a,0 1px 2px -1px #0000001a;box-shadow:var(--shadow);padding:2rem;padding:var(--spacing-xl)}.activity-header{margin-bottom:1.5rem;margin-bottom:var(--spacing-lg)}.activity-title{color:#1f2937;color:var(--text-primary);font-size:1.125rem;font-weight:600;margin-bottom:.5rem;margin-bottom:var(--spacing-sm)}.activity-subtitle{color:#6b7280;color:var(--text-secondary);font-size:.875rem}.activity-list{flex-direction:column}.activity-item,.activity-list{display:flex;gap:1rem;gap:var(--spacing)}.activity-item{align-items:center;border-radius:.5rem;border-radius:var(--radius);padding:1rem;padding:var(--spacing);transition:all .2s ease}.activity-item:hover{background:#f9fafb;background:var(--bg-secondary)}.activity-avatar{align-items:center;border-radius:50%;display:flex;flex-shrink:0;font-size:1.25rem;height:40px;justify-content:center;width:40px}.activity-avatar.course{background:#3b82f61a}.activity-avatar.exam{background:#10b9811a}.activity-avatar.purchase{background:#f59e0b1a}.activity-avatar.achievement{background:#8b5cf61a}.activity-content{flex:1 1}.activity-text{color:#1f2937;color:var(--text-primary);font-size:.875rem;margin-bottom:.25rem;margin-bottom:var(--spacing-xs)}.activity-time{color:#9ca3af;color:var(--text-muted);font-size:.75rem}.data-table-section{background:#fff;background:var(--bg-primary);border-radius:1rem;border-radius:var(--radius-lg);box-shadow:0 1px 3px 0 #0000001a,0 1px 2px -1px #0000001a;box-shadow:var(--shadow);padding:2rem;padding:var(--spacing-xl)}.table-header{align-items:center;display:flex;justify-content:space-between;margin-bottom:1.5rem;margin-bottom:var(--spacing-lg)}.table-title{color:#1f2937;color:var(--text-primary);font-size:1.125rem;font-weight:600}.data-table{border-collapse:collapse;font-size:.875rem;width:100%}.data-table th{background:#f9fafb;background:var(--bg-secondary);border-bottom:1px solid #e5e7eb;border-bottom:1px solid var(--border-color);color:#6b7280;color:var(--text-secondary);font-weight:600;text-align:left}.data-table td,.data-table th{padding:1rem 1.5rem;padding:var(--spacing) var(--spacing-lg)}.data-table td{border-bottom:1px solid #f3f4f6;border-bottom:1px solid var(--border-light);color:#1f2937;color:var(--text-primary)}.data-table tr:hover{background:#f9fafb;background:var(--bg-secondary)}.status-badge{border-radius:.5rem;border-radius:var(--radius);font-size:.75rem;font-weight:600;letter-spacing:.025em;padding:.25rem .5rem;padding:var(--spacing-xs) var(--spacing-sm);text-transform:uppercase}.status-badge.completed{background:#10b9811a;color:#10b981;color:var(--success-color)}.status-badge.in-progress{background:#3b82f61a;color:#3b82f6;color:var(--primary-color)}.status-badge.pending{background:#f59e0b1a;color:#f59e0b;color:var(--warning-color)}.btn{align-items:center;border:1px solid #0000;border-radius:.5rem;border-radius:var(--radius);cursor:pointer;display:inline-flex;font-size:.875rem;font-weight:500;gap:.5rem;gap:var(--spacing-sm);justify-content:center;padding:.5rem 1rem;padding:var(--spacing-sm) var(--spacing);text-decoration:none;transition:all .2s 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#0000001a;box-shadow:var(--shadow-md);transform:translateY(-2px)}.item-card-header{gap:1rem;gap:var(--spacing);margin-bottom:1rem;margin-bottom:var(--spacing)}.item-avatar,.item-card-header{align-items:center;display:flex}.item-avatar{background:#f9fafb;background:var(--bg-secondary);border-radius:.5rem;border-radius:var(--radius);flex-shrink:0;font-size:1.5rem;height:48px;justify-content:center;width:48px}.item-info{flex:1 1}.item-name{color:#1f2937;color:var(--text-primary);font-size:1rem;font-weight:600;margin-bottom:.25rem;margin-bottom:var(--spacing-xs)}.item-meta{color:#6b7280;color:var(--text-secondary);font-size:.875rem}.item-content{margin-bottom:1.5rem;margin-bottom:var(--spacing-lg)}.item-description{color:#6b7280;color:var(--text-secondary);font-size:.875rem;line-height:1.5;margin-bottom:1rem;margin-bottom:var(--spacing)}.item-stats{display:flex;gap:1.5rem;gap:var(--spacing-lg)}.item-stat{text-align:center}.item-stat-value{color:#3b82f6;color:var(--primary-color);font-size:1.25rem;font-weight:700}.item-stat-label{color:#9ca3af;color:var(--text-muted);font-size:.75rem;margin-top:.25rem;margin-top:var(--spacing-xs)}.item-footer{align-items:center;display:flex;justify-content:space-between}.filters-section{background:#fff;background:var(--bg-primary);border-radius:1rem;border-radius:var(--radius-lg);box-shadow:0 1px 3px 0 #0000001a,0 1px 2px -1px 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