:root{--bg-primary:#0a0a0b;--bg-secondary:#111113;--bg-tertiary:#18181b;--bg-elevated:#1f1f23;--border:rgba(255,255,255,0.08);--border-hover:rgba(255,255,255,0.15);--text-primary:#fafafa;--text-secondary:#a1a1aa;--text-tertiary:#71717a;--accent:#5e5ce6;--accent-hover:#7b78f2;--success:#22c55e;--error:#ef4444;--warning:#f59e0b}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Inter',-apple-system,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased}
.noise{position:fixed;inset:0;pointer-events:none;opacity:0.03;z-index:1000;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
.gradient-bg{position:fixed;top:-50%;left:-50%;width:200%;height:200%;pointer-events:none;z-index:-1;background:radial-gradient(circle at 30% 20%,rgba(94,92,230,0.12) 0%,transparent 50%),radial-gradient(circle at 70% 80%,rgba(217,70,239,0.08) 0%,transparent 50%)}
.navbar{position:fixed;top:0;left:0;right:0;height:64px;background:rgba(10,10,11,0.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);z-index:100}
.nav-content{max-width:1400px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;font-weight:600;font-size:1.1rem;cursor:pointer}.logo svg{color:var(--accent)}
.nav-menu{display:flex;gap:4px}
.nav-link{padding:8px 16px;background:transparent;border:none;color:var(--text-secondary);font-size:0.9rem;font-weight:500;border-radius:8px;cursor:pointer;transition:all 0.2s}
.nav-link:hover{color:var(--text-primary);background:var(--bg-tertiary)}.nav-link.active{color:var(--text-primary);background:var(--bg-elevated)}
.nav-user{display:flex;align-items:center;gap:16px}#nav-username{color:var(--text-secondary);font-size:0.9rem}
.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text-secondary);padding:8px 16px;border-radius:8px;font-size:0.875rem;font-weight:500;cursor:pointer;transition:all 0.2s}
.btn-ghost:hover{border-color:var(--border-hover);color:var(--text-primary)}
.btn-primary{padding:12px 20px;background:var(--accent);border:none;border-radius:10px;color:white;font-size:0.9rem;font-weight:600;cursor:pointer;transition:all 0.2s;display:inline-flex;align-items:center;gap:8px}
.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-primary:disabled{opacity:0.5;cursor:not-allowed;transform:none}
.btn-secondary{padding:10px 16px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:8px;color:var(--text-secondary);font-size:0.875rem;font-weight:500;cursor:pointer;transition:all 0.2s}
.btn-secondary:hover{border-color:var(--border-hover);color:var(--text-primary)}
.btn-sm{padding:8px 14px;font-size:0.8rem}
.main-content{padding-top:64px;min-height:100vh}

/* Breadcrumb */
.breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:16px;font-size:0.9rem}
.breadcrumb-item{color:var(--text-tertiary);cursor:pointer;transition:color 0.2s}
.breadcrumb-item:hover{color:var(--accent)}
.breadcrumb-item.active{color:var(--text-primary);cursor:default}
.breadcrumb-item.active:hover{color:var(--text-primary)}
.breadcrumb-sep{color:var(--text-tertiary)}

.auth-container{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - 64px);padding:40px 24px}
.auth-card{width:100%;max-width:400px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:16px;padding:40px}
.auth-header{text-align:center;margin-bottom:32px}.auth-header h1{font-size:1.75rem;font-weight:600;margin-bottom:8px}.auth-header p{color:var(--text-secondary)}
.auth-tabs{display:flex;background:var(--bg-tertiary);border-radius:10px;padding:4px;margin-bottom:28px}
.auth-tab{flex:1;padding:10px;background:transparent;border:none;color:var(--text-tertiary);font-size:0.9rem;font-weight:500;border-radius:8px;cursor:pointer;transition:all 0.2s}
.auth-tab.active{background:var(--bg-elevated);color:var(--text-primary)}
.auth-form{display:flex;flex-direction:column;gap:20px}
.input-group{display:flex;flex-direction:column;gap:8px}.input-group label{font-size:0.875rem;font-weight:500;color:var(--text-secondary)}.required{color:var(--error)}.optional{color:var(--text-tertiary);font-weight:400;font-size:0.8rem}
.input-group input,.input-group textarea,.input-group select{padding:12px 16px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:10px;color:var(--text-primary);font-size:0.95rem;transition:all 0.2s;font-family:inherit;width:100%}
.input-group input:focus,.input-group textarea:focus,.input-group select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(94,92,230,0.15)}
.input-group input::placeholder,.input-group textarea::placeholder{color:var(--text-tertiary)}
.pending-container{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - 64px);padding:40px 24px}
.pending-card{text-align:center}.pending-icon{color:var(--warning);margin-bottom:24px}.pending-card h2{font-size:1.5rem;margin-bottom:12px}.pending-card p{color:var(--text-secondary);margin-bottom:24px}
.page-container{max-width:1200px;margin:0 auto;padding:48px 24px}
.page-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:40px;flex-wrap:wrap;gap:20px}
.page-header h1{font-size:2rem;font-weight:600;margin-bottom:8px}.page-header p{color:var(--text-secondary)}
.header-actions{display:flex;gap:12px;align-items:center}
.view-toggle{display:flex;gap:4px;background:var(--bg-tertiary);border-radius:8px;padding:4px}
.view-btn{padding:8px 16px;background:transparent;border:none;color:var(--text-tertiary);font-size:0.85rem;font-weight:500;border-radius:6px;cursor:pointer;transition:all 0.2s}
.view-btn.active{background:var(--bg-elevated);color:var(--text-primary)}
.series-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.series-card{background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--bg-tertiary) 100%);border:1px solid var(--border);border-radius:16px;padding:24px;cursor:pointer;transition:all 0.3s;position:relative;overflow:hidden}
.series-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent),#d946ef);opacity:0;transition:opacity 0.3s}
.series-card:hover{border-color:var(--border-hover);transform:translateY(-4px);box-shadow:0 20px 40px rgba(0,0,0,0.3)}
.series-card:hover::before{opacity:1}
.series-icon{width:48px;height:48px;background:var(--bg-elevated);border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:var(--accent)}
.series-name{font-size:1.1rem;font-weight:600;margin-bottom:8px}
.series-count{font-size:0.85rem;color:var(--text-tertiary)}
.series-detail{margin-top:-20px}
.series-detail-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;flex-wrap:wrap;gap:12px}
.series-detail-header h2{font-size:1.5rem}
.series-header-actions{display:flex;gap:8px;flex-wrap:wrap}
.lectures-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.lecture-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;overflow:hidden;cursor:pointer;transition:all 0.2s}
.lecture-card:hover{border-color:var(--border-hover);transform:translateY(-2px)}
.lecture-thumb{aspect-ratio:16/9;background:var(--bg-tertiary);display:flex;align-items:center;justify-content:center}.lecture-thumb svg{color:var(--text-tertiary)}
.lecture-content{padding:16px}
.lecture-title{font-weight:600;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.lecture-meta{display:flex;align-items:center;gap:8px;font-size:0.8rem;color:var(--text-tertiary);flex-wrap:wrap}
.category-badge{background:var(--accent);color:white;padding:3px 8px;border-radius:4px;font-size:0.7rem;font-weight:500}
.series-badge{background:var(--bg-tertiary);color:var(--text-secondary);padding:3px 8px;border-radius:4px;font-size:0.7rem;font-weight:500;border:1px solid var(--border)}
.lectures-list{display:flex;flex-direction:column;gap:12px}
.lecture-item{display:flex;align-items:center;gap:12px;padding:16px 20px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;transition:all 0.2s}
.lecture-item:hover{border-color:var(--border-hover);background:var(--bg-tertiary)}
.lecture-item-main{display:flex;align-items:center;gap:16px;flex:1;cursor:pointer}
.lecture-item-icon{width:48px;height:48px;background:var(--bg-elevated);border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--text-tertiary)}
.lecture-item-info{flex:1;min-width:0}
.lecture-item-title{font-weight:500;margin-bottom:4px}
.lecture-item-meta{font-size:0.8rem;color:var(--text-tertiary)}
.lecture-check{display:flex;align-items:center;justify-content:center;width:24px;flex-shrink:0}
.lecture-check input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);cursor:pointer}
.lecture-check.disabled input{cursor:not-allowed;opacity:0.3}

/* Drag and Drop */
.drag-handle{cursor:grab;color:var(--text-tertiary);padding:8px;display:flex;align-items:center;justify-content:center}
.drag-handle:active{cursor:grabbing}
.lecture-item.draggable{cursor:grab}
.lecture-item.draggable:active{cursor:grabbing}
.lecture-item.dragging{opacity:0.5;background:var(--bg-elevated);border-color:var(--accent)}
.lecture-item.drag-over{border-color:var(--accent);background:rgba(94,92,230,0.1)}

/* Sort Dropdown */
.sort-dropdown{position:relative}
.sort-trigger{display:flex;align-items:center;gap:6px}
.sort-trigger svg{flex-shrink:0}
.sort-menu{position:absolute;top:100%;right:0;min-width:160px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:10px;margin-top:8px;box-shadow:0 10px 40px rgba(0,0,0,0.4);z-index:50;overflow:hidden}
.sort-option{display:block;width:100%;padding:12px 16px;background:transparent;border:none;text-align:left;cursor:pointer;font-size:0.85rem;color:var(--text-secondary);transition:all 0.2s}
.sort-option:hover{background:var(--bg-tertiary);color:var(--text-primary)}
.sort-option.active{color:var(--accent);background:rgba(94,92,230,0.1)}

/* Table Filters */
.table-filters{display:flex;align-items:center;gap:16px;margin-bottom:16px;padding:16px 20px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;flex-wrap:wrap}
.filter-group{display:flex;align-items:center;gap:8px}
.filter-group label{font-size:0.85rem;color:var(--text-tertiary)}
.filter-group select{padding:8px 12px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:6px;color:var(--text-primary);font-size:0.85rem;cursor:pointer;min-width:140px}
.filter-group select:focus{outline:none;border-color:var(--accent)}

/* Lectures Table */
.lectures-table{width:100%;border-collapse:collapse;background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;overflow:hidden}
.lectures-table thead{background:var(--bg-tertiary)}
.lectures-table th{padding:14px 16px;text-align:left;font-size:0.8rem;font-weight:600;color:var(--text-secondary);border-bottom:1px solid var(--border)}
.lectures-table td{padding:14px 16px;border-bottom:1px solid var(--border);font-size:0.9rem}
.lectures-table tbody tr:last-child td{border-bottom:none}
.lectures-table tbody tr:hover{background:var(--bg-tertiary)}
.col-check{width:50px;text-align:center}
.col-check input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);cursor:pointer}
.col-check input[type=checkbox]:disabled{cursor:not-allowed;opacity:0.3}
.col-title{min-width:200px;cursor:pointer}
.col-title:hover{color:var(--accent)}
.col-series{width:140px}
.col-category{width:120px}
.col-size{width:100px;color:var(--text-tertiary)}
.col-date{width:120px;color:var(--text-tertiary)}
.title-cell{display:flex;align-items:center;gap:12px}
.title-cell svg{color:var(--text-tertiary);flex-shrink:0}
.no-series{color:var(--text-tertiary)}
.empty-cell{text-align:center;padding:40px!important;color:var(--text-tertiary)}
.lecture-row{transition:background 0.2s}

/* Filter Headers */
.filter-header{display:flex;align-items:center;gap:6px;cursor:pointer;position:relative}
.filter-header:hover{color:var(--text-primary)}
.filter-header svg{width:14px;height:14px}
.filter-header.active{color:var(--accent)}
.filter-dropdown{position:absolute;top:100%;left:0;min-width:180px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;margin-top:8px;box-shadow:0 10px 40px rgba(0,0,0,0.3);z-index:50;display:none}
.filter-dropdown.show{display:block}
.filter-option{padding:10px 14px;cursor:pointer;font-size:0.85rem;font-weight:400;color:var(--text-secondary);transition:all 0.2s}
.filter-option:hover{background:var(--bg-tertiary);color:var(--text-primary)}
.filter-option.selected{color:var(--accent);background:rgba(94,92,230,0.1)}
.filter-option:first-child{border-radius:8px 8px 0 0}
.filter-option:last-child{border-radius:0 0 8px 8px}

/* Bulk Actions */
.bulk-actions{display:flex;align-items:center;gap:16px;padding:16px 20px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;margin-bottom:16px}
#selected-count{font-size:0.9rem;color:var(--text-secondary);font-weight:500}
.bulk-info{font-size:0.9rem;color:var(--text-secondary);margin-bottom:20px;padding:12px 16px;background:var(--bg-tertiary);border-radius:8px}
.bulk-options{margin-top:16px}
.checkbox-label{display:flex;align-items:center;gap:10px;cursor:pointer;padding:12px 16px;background:var(--bg-tertiary);border-radius:8px;font-size:0.9rem;color:var(--text-secondary)}
.checkbox-label:hover{background:var(--bg-elevated)}
.checkbox-label input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent)}

.upload-task{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;padding:20px;margin-bottom:16px;position:relative}
.task-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border)}
.task-number{font-weight:600;color:var(--accent)}
.task-remove{background:none;border:none;color:var(--text-tertiary);font-size:1.2rem;cursor:pointer;padding:4px 8px}.task-remove:hover{color:var(--error)}
.form-row{margin-bottom:16px}
.form-row.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.upload-zone-mini{border:2px dashed var(--border);border-radius:10px;padding:20px;text-align:center;cursor:pointer;transition:all 0.2s}
.upload-zone-mini:hover{border-color:var(--accent);background:rgba(94,92,230,0.05)}
.zone-text{font-size:0.9rem;color:var(--text-tertiary)}
.task-progress{margin-top:12px}
.progress-track{height:4px;background:var(--bg-tertiary);border-radius:2px;overflow:hidden}
.progress-bar{height:100%;background:linear-gradient(90deg,var(--accent),#d946ef);width:0%;transition:width 0.3s}
.progress-text{display:block;margin-top:8px;font-size:0.8rem;color:var(--accent)}
.task-status{margin-top:8px;font-size:0.85rem}
.video-container{background:#000;border-radius:12px;overflow:hidden;margin-bottom:24px}
#video-player{width:100%;max-height:70vh;display:block}
.video-info{max-width:800px}
#watch-title{font-size:1.5rem;font-weight:600;margin-bottom:12px}
.video-meta{display:flex;align-items:center;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.video-meta span{font-size:0.85rem;color:var(--text-tertiary)}
.video-description{color:var(--text-secondary);margin-bottom:24px;white-space:pre-wrap;line-height:1.7}
.video-actions{display:flex;gap:12px;flex-wrap:wrap}
.btn-edit{padding:12px 20px;background:transparent;border:1px solid var(--border);border-radius:10px;color:var(--text-secondary);font-size:0.9rem;font-weight:500;cursor:pointer;transition:all 0.2s}
.btn-edit:hover{border-color:var(--accent);color:var(--accent)}
.btn-delete{padding:12px 20px;background:transparent;border:1px solid rgba(239,68,68,0.3);border-radius:10px;color:var(--error);font-size:0.9rem;font-weight:500;cursor:pointer;transition:all 0.2s}
.btn-delete:hover{background:rgba(239,68,68,0.1);border-color:var(--error)}
.back-btn{display:inline-flex;align-items:center;gap:4px;background:transparent;border:none;color:var(--text-secondary);font-size:0.9rem;cursor:pointer;margin-bottom:24px;padding:8px 0}
.back-btn:hover{color:var(--text-primary)}
.admin-tabs{display:flex;gap:8px;margin-bottom:24px;border-bottom:1px solid var(--border);padding-bottom:16px}
.admin-tab{padding:10px 20px;background:transparent;border:1px solid var(--border);border-radius:8px;color:var(--text-secondary);font-size:0.9rem;font-weight:500;cursor:pointer;transition:all 0.2s;display:flex;align-items:center;gap:8px}
.admin-tab:hover{border-color:var(--border-hover);color:var(--text-primary)}
.admin-tab.active{background:var(--accent);border-color:var(--accent);color:white}
.count-badge{background:rgba(255,255,255,0.2);padding:2px 8px;border-radius:10px;font-size:0.75rem}
.user-item{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;margin-bottom:12px}
.user-info{flex:1}.user-name{font-weight:600;font-size:1rem;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.user-meta{font-size:0.8rem;color:var(--text-tertiary)}
.user-permissions{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.perm-badge{font-size:0.7rem;padding:3px 8px;border-radius:4px;background:var(--bg-tertiary);color:var(--text-secondary)}
.perm-badge.active{background:rgba(34,197,94,0.15);color:var(--success)}
.perm-badge.inactive{background:rgba(239,68,68,0.15);color:var(--error);text-decoration:line-through}
.admin-badge{background:var(--accent);color:white;padding:2px 8px;border-radius:4px;font-size:0.7rem}
.user-actions{display:flex;gap:8px;flex-wrap:wrap}
.btn-approve{padding:8px 16px;background:var(--success);border:none;border-radius:8px;color:white;font-size:0.8rem;font-weight:500;cursor:pointer}
.btn-revoke{padding:8px 14px;background:transparent;border:1px solid var(--warning);border-radius:8px;color:var(--warning);font-size:0.8rem;font-weight:500;cursor:pointer}
.btn-permission{padding:8px 14px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:8px;color:var(--text-secondary);font-size:0.8rem;font-weight:500;cursor:pointer}
.btn-permission:hover{border-color:var(--accent);color:var(--accent)}
.btn-remove{padding:8px 12px;background:transparent;border:1px solid var(--error);border-radius:8px;color:var(--error);font-size:0.8rem;cursor:pointer}
.modal{position:fixed;inset:0;z-index:300;display:flex;align-items:center;justify-content:center}
.modal-overlay{position:absolute;inset:0;background:rgba(0,0,0,0.7);backdrop-filter:blur(4px)}
.modal-content{position:relative;background:var(--bg-secondary);border:1px solid var(--border);border-radius:16px;padding:28px;width:90%;max-width:440px;animation:modalIn 0.2s ease}
.modal-sm{max-width:360px}
@keyframes modalIn{from{opacity:0;transform:scale(0.95)}to{opacity:1;transform:scale(1)}}
.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}
.modal-header h2{font-size:1.25rem;font-weight:600}
.modal-close{background:none;border:none;color:var(--text-tertiary);font-size:1.5rem;cursor:pointer;padding:4px;line-height:1}
.modal-close:hover{color:var(--text-primary)}
.modal-actions{display:flex;gap:12px;margin-top:24px;justify-content:flex-end}
.permission-user-name{font-weight:500;margin-bottom:20px;padding:12px 16px;background:var(--bg-tertiary);border-radius:8px}
.permission-grid{display:flex;flex-direction:column;gap:12px}
.permission-item{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-tertiary);border-radius:8px;cursor:pointer}
.permission-item:hover{background:var(--bg-elevated)}
.permission-item input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent)}
/* Upload Complete Modal */
.upload-complete-icon{text-align:center;margin-bottom:20px;color:var(--success)}
.upload-complete-title{text-align:center;font-size:1.5rem;font-weight:600;margin-bottom:12px}
.upload-complete-desc{text-align:center;color:var(--text-secondary);margin-bottom:24px}
.upload-complete-actions{display:flex;justify-content:center}

.toast{position:fixed;bottom:24px;right:24px;padding:14px 20px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;font-size:0.9rem;font-weight:500;box-shadow:0 20px 40px rgba(0,0,0,0.4);animation:slideUp 0.3s ease;z-index:200}
.toast.success{border-color:var(--success);color:var(--success)}.toast.error{border-color:var(--error);color:var(--error)}
@keyframes slideUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.hidden{display:none!important}
.empty-state{text-align:center;padding:60px 20px;color:var(--text-tertiary)}
::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
@media(max-width:768px){.nav-menu{display:none}.page-header{flex-direction:column}.form-row.two-col{grid-template-columns:1fr}.series-grid{grid-template-columns:1fr}.lectures-grid{grid-template-columns:1fr}.lectures-table{font-size:0.8rem}.lectures-table th,.lectures-table td{padding:10px 8px}.col-series,.col-size{display:none}.bulk-actions{flex-wrap:wrap}.series-header-actions{width:100%;justify-content:flex-start}}