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0;justify-content:center;border-left:none;border-right:3px solid transparent;gap:0}.sidebar-link.active{border-left-color:transparent;border-right-color:var(--accent)}.sidebar-link.active:before{display:none}.sidebar-link svg{width:20px;height:20px}.sidebar-footer{padding:12px;display:flex;flex-direction:column;align-items:center}.sidebar-footer a,.sidebar-footer button{justify-content:center;padding:10px;font-size:0;gap:0}.sidebar-footer a svg,.sidebar-footer button svg{width:18px;height:18px}.main-content{margin-left:var(--sidebar-collapsed);padding:28px 24px}.stats-grid{grid-template-columns:repeat(2,1fr)}.page-header h1{font-size:22px}}@media (max-width: 768px){.sidebar-toggle{display:flex}.sidebar{width:var(--sidebar-width);transform:translate(-100%);box-shadow:none}.sidebar.open{transform:translate(0);box-shadow:8px 0 40px #00000080}.sidebar.open~.sidebar-backdrop,.sidebar-backdrop.visible{display:block}.sidebar-brand span,.sidebar-link .link-text,.sidebar-link span:not(.link-icon){display:inline}.sidebar-brand{padding:24px 20px;justify-content:flex-start}.sidebar-link{padding:13px 22px;justify-content:flex-start;border-left:3px solid transparent;border-right:none;gap:14px}.sidebar-link.active{border-left-color:var(--accent);border-right-color:transparent}.sidebar-footer{padding:18px 22px;align-items:flex-start}.sidebar-footer a,.sidebar-footer button{justify-content:flex-start;font-size:13px;gap:10px}.main-content{margin-left:0;padding:72px 16px 24px;width:100%}.page-header{flex-direction:column;gap:12px;align-items:flex-start;margin-bottom:24px}.page-header h1{font-size:20px}.stats-grid{grid-template-columns:1fr 1fr;gap:12px}.stat-card{padding:20px;gap:14px}.stat-info h3{font-size:24px}.stat-icon{width:44px;height:44px}.chart-grid{grid-template-columns:1fr}.analytics-header{flex-direction:column;align-items:flex-start;gap:12px}.form-row{grid-template-columns:1fr}.popular-table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}.card-header{padding:18px 20px}.card-body{padding:20px}.modal{max-width:100%;margin:10px}.modal-content{width:95vw;max-height:90vh;margin:5vh auto}.btn{min-height:44px;padding:10px 18px}.btn-icon{min-width:44px;min-height:44px}.lesson-item{padding:14px 18px;flex-wrap:wrap}}@media (max-width: 480px){.stats-grid{grid-template-columns:1fr;gap:12px}.main-content{padding:72px 16px 20px}.page-header{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:20px}.page-header h1{font-size:18px}.data-table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap}.modal-overlay{padding:0;align-items:flex-end}.modal{max-width:100%;max-height:100vh;border-radius:16px 16px 0 0;margin:0;animation:slideUp .3s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(100%)}to{opacity:1;transform:translateY(0)}}.confirm-overlay{padding:16px}.confirm-box{padding:24px}.modal-header{padding:18px 20px}.modal-body{padding:20px}.modal-footer{padding:16px 20px;flex-direction:column}.modal-footer .btn{width:100%;justify-content:center}.card-header{padding:16px 18px;flex-direction:column;align-items:flex-start;gap:10px}.card-body{padding:18px}.quick-actions{width:100%}.quick-actions .btn{flex:1;justify-content:center;min-width:0}.lesson-item .lesson-info{min-width:0;flex:1}.back-link{font-size:13px}.stat-card{padding:20px}.stat-info h3{font-size:26px}.badge{font-size:10px;padding:3px 10px}.access-denied h1{font-size:28px}.auth-screen h1{font-size:26px}}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}button:focus:not(:focus-visible),a:focus:not(:focus-visible),input:focus:not(:focus-visible),select:focus:not(:focus-visible),textarea:focus:not(:focus-visible){outline:none}.verify-btn{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:6px;border:1px solid;font-size:13px;cursor:pointer;transition:all .3s;background:transparent}.verify-btn.verified{color:#0af;border-color:#00aaff4d}.verify-btn.verified:hover{background:#00aaff1a}.verify-btn.unverified{color:#ff6b6b;border-color:#ff6b6b4d}.verify-btn.unverified:hover{background:#ff6b6b1a}.image-upload-preview{position:relative;display:inline-block;border-radius:8px;overflow:hidden;border:1px solid rgba(0,170,255,.1)}.image-upload-preview img{max-height:120px;max-width:100%;object-fit:cover;display:block}.image-upload-remove{position:absolute;top:4px;right:4px;background:#000000b3;border:none;color:#fff;width:22px;height:22px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center}.image-upload-area{border:2px dashed rgba(0,170,255,.15);border-radius:8px;padding:24px;text-align:center;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:6px;color:var(--text-secondary);font-size:13px;transition:all .3s}.image-upload-area:hover{border-color:#0af6;background:#00aaff05}.image-upload-area svg{color:var(--accent)}.spin{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media screen and (max-width: 768px){html,body{overflow-x:hidden!important;width:100%!important}.admin-layout{grid-template-columns:1fr!important}.sidebar{display:none!important}.main-content{margin-left:0!important;padding:16px!important;width:100%!important}.page-header{flex-direction:column!important;gap:12px!important;align-items:flex-start!important}.stats-grid{grid-template-columns:1fr 1fr!important;gap:10px!important}.chart-grid,.form-row{grid-template-columns:1fr!important}table,.popular-table{display:block!important;overflow-x:auto!important;font-size:13px!important}.modal-content,.confirm-box{width:92vw!important;max-width:92vw!important;margin:4vh auto!important}.card{border-radius:10px!important}.btn{padding:8px 14px!important;font-size:13px!important}}.admin-mobile-header{display:none;position:fixed;top:0;left:0;right:0;height:56px;background-color:#080810;border-bottom:1px solid rgba(255,255,255,.06);align-items:center;padding:0 16px;gap:12px;z-index:900}.admin-hamburger{background:none;border:none;color:#ccc;cursor:pointer;padding:6px}.admin-mobile-title{font-size:15px;font-weight:600;color:var(--accent, #00aaff)}.admin-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;z-index:998}@media screen and (max-width: 768px){.admin-mobile-header{display:flex!important}.admin-overlay,.admin-layout{display:block!important}.sidebar{display:flex!important;position:fixed!important;top:0!important;left:-280px!important;bottom:0!important;width:260px!important;z-index:999!important;transition:left .3s ease!important;flex-direction:column!important;overflow-y:auto!important;background-color:#080810!important}.sidebar.open{left:0!important}.main-content{margin-left:0!important;padding:72px 12px 24px!important;width:100%!important;min-height:100vh!important}.page-header{flex-direction:column!important;align-items:flex-start!important;gap:10px!important}.page-header h1{font-size:18px!important}.stats-grid{grid-template-columns:1fr 1fr!important;gap:10px!important}.chart-grid,.form-row{grid-template-columns:1fr!important}table,.popular-table{display:block!important;overflow-x:auto!important;white-space:nowrap!important;font-size:12px!important}.modal-content,.confirm-box{width:92vw!important;max-width:92vw!important;max-height:85vh!important;overflow-y:auto!important}.card{padding:14px!important}.btn{padding:8px 12px!important;font-size:12px!important}}.user-search-bar{display:flex;align-items:center;gap:10px;padding:10px 14px;background:#ffffff08;border:1px solid rgba(255,255,255,.08);border-radius:8px;margin-bottom:16px}.user-search-bar svg{color:var(--text-secondary);flex-shrink:0}.user-search-bar input{flex:1;background:none;border:none;color:var(--text-primary);font-size:14px;outline:none}.user-search-bar input::placeholder{color:var(--text-secondary)}@media screen and (max-width: 375px){html{font-size:13px}.admin-mobile-header{height:50px!important;padding:0 10px!important}.admin-mobile-title{font-size:13px!important}.main-content{padding:58px 10px 16px!important}.page-header h1{font-size:16px!important}.page-header .btn{padding:5px 10px!important;font-size:11px!important}.stats-grid{grid-template-columns:1fr!important;gap:8px!important}.stat-card{padding:14px!important}.stat-card h3{font-size:20px!important}.card{padding:12px!important;border-radius:8px!important}.form-group label{font-size:12px!important}.form-group input,.form-group textarea,.form-group select{padding:8px 10px!important;font-size:13px!important}.modal-content{margin:8px!important;padding:16px!important;max-height:88vh!important}.confirm-box{padding:20px 16px!important}table,.popular-table{font-size:11px!important}table th,table td,.popular-table th,.popular-table td{padding:6px 8px!important}.sidebar{width:240px!important}.sidebar-brand h2{font-size:16px!important}.sidebar-link{font-size:13px!important;padding:10px 16px!important}.btn{padding:7px 10px!important;font-size:11px!important}.chart-card{padding:14px!important}.chart-card h3{font-size:14px!important}.user-search-bar{padding:8px 10px!important}.user-search-bar input{font-size:13px!important}.verify-btn{padding:3px 8px!important;font-size:11px!important}.role-select{padding:4px 6px!important;font-size:11px!important}.image-upload-area{padding:16px!important}.image-upload-preview img{max-height:80px!important}img{max-width:100%!important}}