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1rem;position:relative;text-decoration:none;transition:none;transition:var(--transition)}.btn:before{background:#ffffff4d;border-radius:50%;content:"";height:0;left:50%;position:absolute;top:50%;transform:translate(-50%,-50%);transition:width .6s,height .6s;width:0}.btn:hover:before{height:300px;width:300px}.btn-primary{background:#10b981;background:var(--primary);border:1px solid #10b981;border:1px solid var(--primary);color:#fff}.btn-primary:hover{background:#059669;background:var(--primary-dark);border-color:#059669;border-color:var(--primary-dark)}.btn-secondary{background:#fff;background:var(--bg-primary);border:1px solid #e2e8f0;border:1px solid var(--border-color);color:#0f172a;color:var(--text-primary)}.btn-secondary:hover{background:#f8fafc;background:var(--bg-secondary);border-color:#10b981;border-color:var(--primary);color:#10b981;color:var(--primary)}.btn-danger{background:#ef4444;background:var(--danger);border:1px solid #ef4444;border:1px solid var(--danger);color:#fff}.btn-danger:hover{background:#dc2626;border-color:#dc2626}.btn-success{background:#10b981;background:var(--secondary);border:1px solid #10b981;border:1px solid var(--secondary);color:#fff}.btn-success:hover{background:#059669;border-color:#059669}.btn-sm{font-size:.75rem;padding:.375rem .75rem}.btn-lg{font-size:.875rem;padding:.5rem 1.25rem}.form-group{margin-bottom:1rem;margin-bottom:var(--spacing-md)}.form-group label{color:#0f172a;display:block;font-size:.8125rem;margin-bottom:.25rem;margin-bottom:var(--spacing-xs)}.form-group input,.form-group select,.form-group textarea{background:#fff;background:var(--bg-primary);border:1px solid #e2e8f0;border:1px solid var(--border-color);border-radius:12px;border-radius:var(--border-radius);color:#0f172a;color:var(--text-primary);font-family:inherit;font-size:.875rem;padding:.625rem .875rem;transition:none;transition:var(--transition);width:100%}.form-group input:focus,.form-group select:focus,.form-group 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tr:hover{background:#f8fafc;background:var(--bg-secondary)}.badge{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:9999px;display:inline-flex;font-size:.75rem;font-weight:500;gap:.25rem;gap:var(--spacing-xs);padding:.25rem .625rem}.badge-success{background:#10b9811a;border:1px solid #10b9814d;color:#10b981;color:var(--secondary)}.badge-warning{color:var(--warning)}.badge-danger{color:var(--danger)}.badge-info{color:var(--info)}.loading{align-items:center;display:flex;justify-content:center;padding:2.5rem;padding:var(--spacing-2xl)}.spinner{border:4px solid #e5e7eb;border-top-color:#10b981;border:4px solid var(--gray-200);border-radius:50%;border-top-color:var(--primary);height:48px;width:48px}.glass{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:#ffffffb3;background:var(--bg-glass);border:1px solid #fff3}*{-ms-overflow-style:none;scrollbar-width:none}::-webkit-scrollbar{display:none}@media (max-width:768px){.container{padding:0 1rem;padding:0 var(--spacing-md)}.card{padding:1.5rem;padding:var(--spacing-lg)}.table{font-size:.75rem}.table td,.table th{padding:1rem;padding:var(--spacing-md)}}.admin-dashboard{background:var(--bg-secondary);display:flex;flex-direction:column;min-height:100vh}.admin-header{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:var(--bg-glass);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-sm);justify-content:space-between;padding:var(--spacing-lg) var(--spacing-xl);position:-webkit-sticky;position:sticky;top:0;z-index:100}.admin-header,.header-left,.logo{align-items:center;display:flex}.logo{color:var(--text-primary);font-size:1.25rem;font-weight:700;gap:var(--spacing-md)}.logo-icon{align-items:center;border-radius:var(--border-radius);box-shadow:var(--shadow-glow);color:#fff;display:flex;height:44px;justify-content:center;width:44px}.logo-icon,.logo-text{background:linear-gradient(135deg,#10b981,#059669)}.logo-text{-webkit-text-fill-color:#0000;-webkit-background-clip:text;background-clip:text;font-weight:800;letter-spacing:-.5px}.header-right{gap:var(--spacing-lg)}.header-right,.theme-toggle{align-items:center;display:flex}.theme-toggle{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--border-radius);box-shadow:var(--shadow-sm);color:var(--text-primary);cursor:pointer;height:44px;justify-content:center;padding:var(--spacing-sm);transition:var(--transition);width:44px}.theme-toggle:hover{background:var(--bg-secondary);box-shadow:var(--shadow-md)}.user-menu{align-items:center;display:flex;gap:var(--spacing-md)}.user-avatar{background:linear-gradient(135deg,#10b981,#059669);border-radius:50%;box-shadow:var(--shadow-md);font-weight:600;height:44px;justify-content:center;width:44px}.logout-btn,.user-avatar{align-items:center;color:#fff;display:flex}.logout-btn{background:linear-gradient(135deg,var(--danger) 0,#dc2626 100%);border:none;border-radius:var(--border-radius);box-shadow:0 4px 14px 0 #ef44444d;cursor:pointer;font-size:.8125rem;font-weight:500;gap:var(--spacing-xs);padding:.5rem 1rem;transition:var(--transition)}.logout-btn:hover{box-shadow:0 6px 20px 0 #ef444466}.dashboard-content{display:flex;flex:1 1;overflow:hidden}.admin-sidebar{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:var(--bg-glass);border-right:1px solid var(--border-color);display:flex;flex-direction:column;height:100vh;left:0;overflow:hidden;padding:var(--spacing-xl);position:fixed;top:0;width:280px;z-index:100}.sidebar-header{align-items:center;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;margin-bottom:var(--spacing-xl);padding-bottom:var(--spacing-lg)}.sidebar-header .logo{align-items:center;color:var(--text-primary);display:flex;font-size:1.25rem;font-weight:600;gap:var(--spacing-sm)}.sidebar-header .logo-icon{align-items:center;background:#0000;border:none;border-radius:calc(var(--border-radius)*.75);box-shadow:none;color:#fff;display:flex;height:48px;justify-content:center;width:48px}.sidebar-header .logo-text{color:var(--text-primary);font-size:1.25rem;font-weight:700;letter-spacing:-.25px}.sidebar-footer .theme-toggle,.sidebar-header .theme-toggle{align-items:center;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:16px;box-shadow:var(--shadow-sm);color:var(--text-primary);cursor:pointer;display:flex;height:36px;justify-content:center;margin:0 auto;padding:3px;position:relative;transition:all .3s ease;width:80px}.sidebar-footer .theme-toggle-slider,.sidebar-header .theme-toggle-slider{align-items:center;display:flex;height:100%;justify-content:space-between;padding:0 6px;position:relative;width:100%}.sidebar-footer .theme-icon,.sidebar-header .theme-icon{flex-shrink:0;position:relative;transition:all .3s ease;z-index:2}.sidebar-footer .theme-toggle-thumb,.sidebar-header .theme-toggle-thumb{background:#fff;border:1px solid var(--border-color);border-radius:50%;box-shadow:0 2px 6px #0003;height:28px;left:3px;position:absolute;top:50%;transform:translateY(-50%);transition:all .3s ease;width:28px;z-index:1}[data-theme=dark] .sidebar-footer .theme-toggle-thumb,[data-theme=dark] .sidebar-header .theme-toggle-thumb{background:#1e293b;border-color:#334155}.sidebar-footer .theme-toggle.dark .theme-toggle-thumb,.sidebar-header .theme-toggle.dark .theme-toggle-thumb{left:calc(100% - 31px);transform:translateY(-50%)}.sidebar-footer .theme-toggle.light .sun-icon,.sidebar-header .theme-toggle.light .sun-icon{color:#f59e0b}.sidebar-footer .theme-toggle.dark .moon-icon,.sidebar-header .theme-toggle.dark .moon-icon{color:#3b82f6}.sidebar-footer .theme-toggle.dark .sun-icon,.sidebar-footer .theme-toggle.light .moon-icon,.sidebar-header .theme-toggle.dark .sun-icon,.sidebar-header .theme-toggle.light .moon-icon{color:var(--text-tertiary)}.sidebar-header .theme-toggle:hover{background:var(--bg-secondary);box-shadow:var(--shadow-md)}.sidebar-footer{border-top:1px solid var(--border-color);margin-top:auto;padding-top:var(--spacing-lg)}.logout-btn-sidebar{align-items:center;background:var(--danger);border:none;border-radius:var(--border-radius);color:#fff;cursor:pointer;display:flex;font-size:.8125rem;font-weight:500;gap:var(--spacing-xs);justify-content:center;padding:.5rem 1rem;transition:var(--transition);width:100%}.logout-btn-sidebar:hover{box-shadow:0 6px 20px 0 #ef444466}.sidebar-nav{flex:1 1;flex-direction:column;gap:var(--spacing-xs)}.nav-item,.sidebar-nav{display:flex;overflow:hidden}.nav-item{align-items:center;border-radius:var(--border-radius);color:var(--text-secondary);cursor:pointer;font-size:.875rem;font-weight:500;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);position:relative;transition:var(--transition)}.nav-item:before{background:#0000;content:"";height:100%;left:0;position:absolute;top:0;width:3px}.nav-item:hover{background:var(--bg-secondary);color:var(--text-primary)}.nav-item.active{background:#10b9811a;box-shadow:var(--shadow-sm);color:var(--primary);font-weight:600}.nav-item.active:before{background:var(--primary)}.nav-item svg{flex-shrink:0;transition:var(--transition)}.nav-item.active svg{color:var(--primary)}.nav-indicator{background:var(--primary);border-radius:50%;box-shadow:0 0 10px var(--primary);height:6px;position:absolute;right:var(--spacing-md);width:6px}.admin-main{background:#0000;flex:1 1;margin-left:280px;overflow-y:auto;padding:var(--spacing-xl)}.dashboard-overview{margin:0;max-width:100%}.page-header h1{color:var(--text-primary);font-size:1.5rem;font-weight:600;letter-spacing:-.25px;margin-bottom:var(--spacing-sm)}.page-header p{font-size:1rem;font-weight:500}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));margin-bottom:var(--spacing-2xl)}.stat-card{box-shadow:var(--shadow);gap:var(--spacing-lg);overflow:hidden;padding:var(--spacing-xl);position:relative}.stat-card:before{background:linear-gradient(90deg,#10b981,#059669);content:"";height:4px;left:0;position:absolute;right:0;top:0}.stat-card:hover{border-color:var(--primary)}.stat-icon{border-radius:var(--border-radius-lg);box-shadow:var(--shadow-md);height:64px;width:64px}.stat-label{color:var(--text-secondary);font-size:.875rem;font-weight:500}.stat-label,.stat-value{margin-bottom:var(--spacing-xs)}.stat-value{letter-spacing:-.5px}.stat-change{align-items:center;color:var(--text-tertiary);display:flex;font-size:.75rem;gap:var(--spacing-xs)}.stat-change.positive{color:var(--secondary);font-weight:600}.dashboard-sections{grid-gap:var(--spacing-lg);display:grid;gap:var(--spacing-lg);grid-template-columns:repeat(auto-fit,minmax(500px,1fr))}.section-card{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:var(--bg-glass);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);box-shadow:var(--shadow);padding:var(--spacing-xl)}.section-card h2{color:var(--text-primary);font-size:1.25rem;font-weight:600;letter-spacing:-.25px;margin-bottom:var(--spacing-lg)}.chart-card{grid-column:1/-1}.user-cell{gap:var(--spacing-md)}.user-avatar-mini,.user-cell{align-items:center;display:flex}.user-avatar-mini{background:linear-gradient(135deg,#10b981,#059669);border-radius:50%;box-shadow:var(--shadow-sm);color:#fff;flex-shrink:0;font-size:.875rem;font-weight:600;height:36px;justify-content:center;width:36px}@media (max-width:1024px){.admin-sidebar{width:240px}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}}@media (max-width:768px){.dashboard-content{flex-direction:column}.admin-sidebar{border-bottom:1px solid var(--border-color);border-right:none;height:auto;padding:var(--spacing-md);position:static;width:100%}.sidebar-nav{flex-direction:row;overflow-x:auto;padding-bottom:var(--spacing-sm)}.nav-item{min-width:-webkit-fit-content;min-width:fit-content;white-space:nowrap}.admin-main{margin-left:0;padding:var(--spacing-md)}.dashboard-sections,.stats-grid{grid-template-columns:1fr}.page-header h1{font-size:1.5rem}}.modal-overlay{background:#0000001a;padding:var(--spacing-md)}.modal-content{border-radius:calc(var(--border-radius-lg)*.75);box-shadow:0 10px 25px #00000026;display:flex;flex-direction:column;max-width:90vw;overflow:hidden}.modal-content,[data-theme=dark] .modal-content{background:#fff}.modal-sm{width:380px}.modal-md{width:560px}.modal-lg{width:720px}.modal-xl{max-width:1300px!important;width:1300px!important}.modal-header{border-bottom:1px solid var(--border-color);margin-bottom:0;padding:.25rem var(--spacing-lg)}.modal-header,[data-theme=dark] .modal-header{background:#fff}.modal-header h3{font-size:1.25rem;font-weight:600;letter-spacing:-.25px}.modal-close{align-items:center;background:#0000;border:none;border-radius:calc(var(--border-radius)*.75);color:var(--text-secondary);cursor:pointer;display:flex;height:28px;justify-content:center;padding:var(--spacing-xs);transition:var(--transition);width:28px}.modal-close:hover{background:var(--bg-secondary);color:var(--text-primary)}.modal-body{-ms-overflow-style:none;background:#fff!important;flex:1 1;overflow-y:auto;padding:var(--spacing-sm) var(--spacing-lg);scrollbar-width:none}.modal-body::-webkit-scrollbar{display:none}[data-theme=dark] .modal-body{background:#fff!important}.modal-body *,.modal-content,.modal-content *{background-color:#fff!important}.modal-body div[style*=background],.modal-body input,.modal-body select,.modal-body textarea{background:#fff!important;background-color:#fff!important}.modal-body .form-group{background:#0000!important}.modal-body [style*=background]{background:#fff!important;background-color:#fff!important}@media (max-width:768px){.modal-content{border-radius:0;max-height:100vh;max-width:100%;width:100%!important}.modal-overlay{padding:0}.modal-header h3{font-size:1.25rem}}.courses-page{margin:0;max-width:100%}.page-header{margin-bottom:var(--spacing-2xl)}.page-actions{align-items:center;display:flex;gap:var(--spacing-md)}.search-box{min-width:280px}.course-form{background:#fff;border:1px solid var(--border-color);border-radius:calc(var(--border-radius-lg)*.75);box-shadow:var(--shadow-md);margin-bottom:var(--spacing-lg);padding:var(--spacing-md)}[data-theme=dark] .course-form{background:var(--bg-primary)}.form-header{align-items:center;border-bottom:2px solid var(--border-color);display:flex;justify-content:space-between;margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-md)}.form-header h3{color:var(--text-primary);font-size:1.5rem;font-weight:700;letter-spacing:-.5px}.close-btn{align-items:center;background:#0000;border:none;border-radius:var(--border-radius);color:var(--text-secondary);cursor:pointer;display:flex;height:36px;justify-content:center;padding:var(--spacing-sm);transition:var(--transition);width:36px}.close-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.form-grid{grid-gap:var(--spacing-sm) var(--spacing-md);display:grid;gap:var(--spacing-sm) var(--spacing-md);grid-template-columns:1fr}.form-group.full-width,.video-upload-section{grid-column:1/-1}.upload-area{background:var(--bg-secondary);border:1.5px dashed var(--border-color);border-radius:calc(var(--border-radius-lg)*.75);cursor:pointer;overflow:hidden;padding:var(--spacing-md);position:relative;text-align:center;transition:var(--transition)}.upload-area:before{background:#10b9811a;content:"";height:100%;left:-100%;position:absolute;top:0;transition:var(--transition-slow);width:100%}.upload-area:hover:before{left:100%}.upload-area:hover{background:#10b9810d;border-color:var(--primary);box-shadow:var(--shadow-md)}.upload-area.dragover{background:#10b9811a;border-color:var(--primary);box-shadow:var(--shadow-glow)}.upload-icon{color:var(--text-tertiary);height:36px;margin:0 auto var(--spacing-sm);opacity:.6;width:36px}.upload-text{color:var(--text-primary);font-size:.8125rem;font-weight:400;margin-bottom:var(--spacing-xs)}.upload-hint{color:var(--text-tertiary);font-size:.6875rem}.progress-bar{border-radius:9999px;box-shadow:inset 0 2px 4px #0000001a;height:10px;margin-top:var(--spacing-md);width:100%}.progress-fill{background:var(--primary);border-radius:9999px}.video-url-display{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--border-radius);margin-top:var(--spacing-md);padding:var(--spacing-md)}.video-url-display small{color:var(--text-secondary);display:block;font-size:.75rem;font-weight:600;margin-bottom:var(--spacing-xs)}.video-url-display div{color:var(--text-primary);font-family:Fira Code,monospace;font-size:.75rem;word-break:break-all}.checkbox-group{border-radius:var(--border-radius);padding:var(--spacing-sm);transition:var(--transition)}.checkbox-group:hover{background:var(--bg-secondary)}.courses-table-container{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:var(--bg-glass);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-lg);overflow:hidden}.table-header{padding:var(--spacing-lg) 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1;flex-direction:column;gap:var(--spacing-xs)}.activity-header{align-items:center;display:flex;gap:var(--spacing-md);justify-content:space-between}.activity-type{color:var(--text-primary);font-size:.875rem;font-weight:600}.activity-time{align-items:center;color:var(--text-tertiary);display:flex;font-size:.75rem;gap:4px}.activity-description{color:var(--text-secondary);font-size:.875rem;line-height:1.5}.activity-user{align-items:center;color:var(--text-tertiary);display:flex;font-size:.75rem;gap:4px;margin-top:var(--spacing-xs)}.loading-container{color:var(--text-secondary)}.empty-state,.loading-container{align-items:center;display:flex;flex-direction:column;gap:var(--spacing-md);justify-content:center;padding:var(--spacing-3xl)}.empty-state{color:var(--text-tertiary)}.empty-state svg{opacity:.5}.pagination{align-items:center;border-top:1px solid var(--border-color);display:flex;gap:var(--spacing-md);justify-content:center;margin-top:var(--spacing-lg);padding:var(--spacing-lg)}.pagination button:disabled{cursor:not-allowed;opacity:.5}@media (max-width:768px){.activity-filters{flex-direction:column}.search-box{width:100%}.activity-header{align-items:flex-start;flex-direction:column}}.app,.loading-screen{min-height:100vh}.loading-screen{align-items:center;background:var(--bg-secondary);display:flex;justify-content:center}.loading-screen .spinner{height:48px;width:48px}