@import "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css";:root{--primary:#4f46e5;--primary-hover:#4338ca;--gradient-primary:linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);--success:#10b981;--success-hover:#059669;--bg-light:#f8fafc;--text-dark:#0f172a;--text-gray:#64748b;--header-h:70px;--border-color:#e2e8f0;--shadow-soft:0 4px 6px -1px #0000000d, 0 2px 4px -1px #00000008;--shadow-hover:0 20px 25px -5px #4f46e526, 0 10px 10px -5px #4f46e50a;--glass-bg:#ffffffb3;--glass-border:1px solid #ffffff4d}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{box-sizing:border-box;width:100%;max-width:100vw;overflow-x:hidden}body{background-color:var(--bg-light);color:var(--text-dark);flex-direction:column;min-height:100vh;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;display:flex}#root{flex-direction:column;min-height:100vh;display:flex}a{color:inherit;text-decoration:none}ul{list-style:none}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 16px}.main-content{flex:1}.btn{cursor:pointer;border:none;border-radius:9999px;justify-content:center;align-items:center;padding:12px 28px;font-size:1rem;font-weight:600;transition:all .3s;display:inline-flex;position:relative;overflow:hidden}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-soft)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 20px #4f46e566}.btn-outline{color:var(--primary);border:2px solid var(--primary);background-color:#0000}.btn-outline:hover{background-color:#4f46e50d;transform:translateY(-2px);box-shadow:0 0 15px #4f46e533}.header{z-index:100;-webkit-backdrop-filter:blur(8px);height:var(--header-h);border-bottom:1px solid var(--border-color);background:#fffffff2;position:sticky;top:0;box-shadow:0 2px 10px #0000000d}.header .container{justify-content:space-between;align-items:center;height:100%;display:flex}.header-logo{color:var(--primary);align-items:center;gap:8px;font-size:1.5rem;font-weight:800;display:flex}.nav-desktop{align-items:center;gap:32px;display:flex}.nav-link{color:var(--text-gray);font-weight:600;transition:color .3s}.nav-link:hover,.nav-link.active{color:var(--primary)}.header-auth .btn{padding:8px 20px;font-size:.95rem}.nav-mobile-btn{color:var(--text-gray);cursor:pointer;background:0 0;border:none;font-size:1.5rem;display:none}.drawer-content.open{transform:translate(-300px)}.drawer-close{color:var(--text-gray);cursor:pointer;background:0 0;border:none;font-size:1.5rem}.drawer-body{flex-direction:column;gap:15px;padding:20px;display:flex}.hero-section{background:linear-gradient(180deg, #fff 0%, var(--bg-light) 100%);align-items:center;min-height:70vh;padding:80px 0;display:flex}.hero-grid{grid-template-columns:1fr 1fr;align-items:center;gap:60px;display:grid}.hero-content h1{color:var(--text-dark);letter-spacing:-1px;margin-bottom:24px;font-size:3.5rem;font-weight:800;line-height:1.2}.hero-content h1 span{color:var(--primary)}.hero-content p{color:var(--text-gray);max-width:90%;margin-bottom:40px;font-size:1.25rem}.hero-actions{flex-wrap:wrap;gap:16px;display:flex}.hero-image-box{border-radius:24px;transition:transform .5s;overflow:hidden;transform:perspective(1000px)rotateY(-5deg);box-shadow:0 20px 40px #0000001a}.hero-image-box:hover{transform:perspective(1000px)rotateY(0)scale(1.02)}.hero-image-box img{object-fit:cover;width:100%;height:100%;display:block}.features-section{background:#fff;padding:80px 0}.section-header{text-align:center;margin-bottom:60px}.section-header h2{margin-bottom:16px;font-size:2.5rem;font-weight:800}.features-grid{grid-template-columns:repeat(4,1fr);gap:30px;display:grid}.feature-card{border:1px solid var(--border-color);text-align:center;background:#fff;border-radius:20px;padding:40px 30px;transition:all .3s}.feature-card:hover{border-color:#0000;transform:translateY(-10px);box-shadow:0 15px 30px #0000000d}.feature-icon{color:#fff;border-radius:16px;justify-content:center;align-items:center;width:60px;height:60px;margin:0 auto 24px;font-size:1.8rem;display:flex}.icon-purple{background:linear-gradient(135deg,#c084fc,#9333ea)}.icon-blue{background:linear-gradient(135deg,#60a5fa,#2563eb)}.icon-orange{background:linear-gradient(135deg,#fb923c,#ea580c)}.icon-green{background:linear-gradient(135deg,#34d399,#059669)}.feature-card h3{margin-bottom:12px;font-size:1.25rem}.feature-card p{color:var(--text-gray);font-size:.95rem}.lesson-nav{border:1px solid var(--border-color);background:#fff;border-radius:20px;flex-wrap:wrap;justify-content:center;gap:12px;margin:40px 0;padding:12px;display:flex}.l-nav-item{cursor:pointer;background:var(--bg-light);color:var(--text-gray);border-radius:12px;padding:10px 24px;font-weight:600;transition:all .3s}.l-nav-item:hover{background:#e2e8f0}.l-nav-item.active{background:var(--primary);color:#fff}.lesson-module{border:1px solid var(--border-color);text-align:center;background:#fff;border-radius:24px;max-width:800px;margin:0 auto 60px;padding:40px;box-shadow:0 10px 30px #00000005}.app-container{flex-direction:column;min-height:100vh;display:flex}.main-container{flex:1}.footer{color:#94a3b8;background-color:#0f172a;margin-top:auto;padding:30px 0}.footer-grid{grid-template-columns:repeat(4,1fr);gap:40px;margin-bottom:30px;display:grid}.footer-title{color:#fff;margin-bottom:24px;font-size:1.2rem;font-weight:700}.footer-links{flex-direction:column;gap:12px;display:flex}.footer-links a:hover{color:var(--primary)}.footer-bottom{text-align:center;border-top:1px solid #1e293b;padding-top:20px;font-size:.9rem}.admin-stats{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;margin-bottom:30px;display:grid}.stat-card{cursor:pointer;background-color:#fff;border-radius:12px;justify-content:space-between;align-items:center;padding:24px;transition:all .3s ease-in-out;display:flex;position:relative;overflow:hidden;box-shadow:0 4px 12px #0000000d}.stat-card:hover{transform:translateY(-5px);box-shadow:0 10px 20px #0000001a}.stat-info{flex-direction:column;align-items:flex-start;display:flex}.stat-card h3{color:#6b7280;text-transform:uppercase;letter-spacing:.5px;margin:0;font-size:14px;font-weight:600}.stat-card h1{color:#111827;margin:8px 0 0;font-size:32px;font-weight:700}.stat-icon{opacity:.8;border-radius:50%;justify-content:center;align-items:center;padding:12px;font-size:28px;display:flex}.admin-table{border-collapse:collapse;background:#fff;border-radius:8px;width:100%;margin-top:10px;overflow:hidden;box-shadow:0 2px 8px #0000000d}.admin-table th{color:var(--text-dark);background-color:#f8f9fa;font-weight:700}.admin-table tr:hover{background-color:#f9f9f9}.btn-edit,.btn-del{cursor:pointer;border:none;border-radius:6px;padding:8px 16px;font-weight:600;transition:background-color .2s,transform .2s}.btn-edit{color:#fff;background-color:#3498db;margin-right:8px}.btn-edit:hover{background-color:#2980b9;transform:translateY(-2px)}.btn-del{color:#fff;background-color:#e74c3c}.btn-del:hover{background-color:#c0392b;transform:translateY(-2px)}.btn-action{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:10px 20px;font-weight:600;transition:all .3s}.btn-action:hover{background:var(--primary-hover);transform:translateY(-2px)}.btn-add{background-color:var(--success);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:8px 20px;font-weight:600;transition:all .2s}.btn-add:hover{background-color:var(--success-hover);transform:translateY(-2px)}.modal-overlay{z-index:1000;background-color:#00000080;justify-content:center;align-items:center;width:100%;height:100vh;display:flex;position:fixed;top:0;left:0}.modal-content{background:#fff;border-radius:12px;flex-direction:column;gap:16px;width:400px;max-width:90%;padding:24px;display:flex;box-shadow:0 10px 25px #0003}.modal-content .form-group{flex-direction:column;gap:5px;display:flex}.modal-content label{color:var(--text-dark);font-weight:600}.modal-content input,.modal-content select,.modal-content textarea{box-sizing:border-box;border:1px solid #ccc;border-radius:6px;width:100%;padding:10px;font-family:inherit}.modal-content input:focus{border-color:var(--primary);outline:none}.modal-actions{justify-content:flex-end;gap:10px;margin-top:10px;display:flex}@media (width<=992px){.features-grid,.footer-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=768px){.nav-desktop,.header-auth{display:none}.nav-mobile-btn{display:block}.hero-grid{text-align:center;grid-template-columns:1fr}.hero-content h1{font-size:2.5rem}.hero-content p{max-width:100%;margin:0 auto 32px}.hero-actions{justify-content:center}.hero-image-box{transform:none}.hero-image-box:hover{transform:scale(1.02)}.features-grid,.footer-grid{grid-template-columns:1fr}}.toolbar{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;margin-bottom:30px;padding-bottom:15px;display:flex}.toolbar-title{color:var(--text-color);font-size:1.5rem;font-weight:700}.toolbar-actions{gap:12px;display:flex}.class-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px;display:grid}.class-card{border:1px solid var(--border-color);background-color:#fff;border-radius:12px;flex-direction:column;transition:transform .2s,box-shadow .2s;display:flex;overflow:hidden;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.class-card:hover{transform:translateY(-5px);box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d}.class-card-header{background:linear-gradient(135deg, var(--primary) 0%, #a855f7 100%);color:#fff;align-items:flex-end;height:100px;padding:24px 20px;display:flex}.class-card-header h3{white-space:nowrap;text-overflow:ellipsis;width:100%;margin:0;font-size:1.25rem;font-weight:600;overflow:hidden}.class-card-body{flex-direction:column;flex-grow:1;gap:12px;padding:20px;display:flex}.class-code-wrapper{color:#4b5563;margin:0;font-size:.95rem}.class-code{color:var(--primary);letter-spacing:1px;background:#f3f4f6;border-radius:4px;padding:4px 8px;font-family:monospace;font-size:1.1rem;font-weight:700}.dropdown{position:absolute;top:20px;right:20px}.settings-btn{color:#fff;cursor:pointer;background:#fff3;border:none;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;transition:background .2s;display:flex}.settings-btn:hover{background:#fff6}.dropdown-menu{z-index:100;border:1px solid var(--border-color);background:#fff;border-radius:8px;width:180px;position:absolute;top:40px;right:0;overflow:hidden;box-shadow:0 10px 25px -5px #0000001a,0 8px 10px -6px #0000001a}.dropdown-menu button{text-align:left;border:none;border-bottom:1px solid var(--border-color);cursor:pointer;background:0 0;align-items:center;gap:10px;width:100%;padding:12px 16px;font-size:.95rem;font-weight:500;transition:background .2s;display:flex;color:#333!important}.dropdown-menu button:last-child{border-bottom:none}.dropdown-menu button:hover{background:#f3f4f6}.dropdown-menu button.text-danger{color:#dc2626!important}.dropdown-menu button.text-danger:hover{background:#fef2f2}.members-list::-webkit-scrollbar{width:6px}.members-list::-webkit-scrollbar-track{background:#f1f1f1;border-radius:4px}.members-list::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:4px}.members-list::-webkit-scrollbar-thumb:hover{background:#a8a8a8}.file-drop-zone{text-align:center;cursor:pointer;background-color:#f8fafc;border:2px dashed #cbd5e1;border-radius:8px;flex-direction:column;align-items:center;gap:10px;padding:30px;transition:all .2s;display:flex}.file-drop-zone:hover{border-color:var(--primary);background-color:#f3e8ff}.file-drop-zone i{color:#94a3b8;font-size:40px;transition:color .2s}.file-drop-zone:hover i{color:var(--primary)}.file-drop-zone p{color:#475569;margin:0;font-size:.95rem}.file-drop-zone .file-name{color:var(--primary);font-weight:600}.hidden-file-input{display:none}.exam-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-top:20px;display:grid}.exam-card{border:1px solid 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#00000008}.post-header{align-items:center;gap:12px;margin-bottom:16px;display:flex}.post-avatar{background-color:var(--primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:45px;height:45px;font-size:1.2rem;font-weight:700;display:flex}.post-meta h4{color:var(--text-color);margin:0 0 4px;font-size:1.05rem}.post-meta span{color:#6b7280;font-size:.85rem}.post-body{white-space:pre-wrap;word-break:break-word;color:#374151;margin-bottom:16px;line-height:1.6}.post-attachments-grid{flex-direction:column;gap:12px;margin-bottom:16px;display:flex}.attachment-image{object-fit:contain;border:1px solid #e5e7eb;border-radius:8px;width:auto;max-width:100%;max-height:300px}.attachment-pdf{border:1px solid var(--border-color);border-radius:8px;width:100%;height:400px}.attachment-document{border:1px solid var(--border-color);color:var(--text-color);background-color:#f9fafb;border-radius:8px;align-items:center;gap:12px;padding:12px 16px;text-decoration:none;transition:all 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16px}.comment-author{color:var(--text-color);margin-bottom:4px;font-size:.9rem;font-weight:600}.comment-text{color:#374151;white-space:pre-wrap;word-break:break-word;font-size:.95rem}.comment-time{color:#6b7280;margin-top:4px;font-size:.75rem;display:block}.comment-input-group{align-items:center;gap:12px;display:flex}.comment-input-group input{border:1px solid var(--border-color);border-radius:24px;outline:none;flex:1;padding:12px 16px;font-family:inherit;transition:all .2s}.comment-input-group input:focus{border-color:var(--primary);box-shadow:0 0 0 2px #3b82f61a}.dropdown-menu{opacity:0;visibility:hidden;background-color:#fff;border-radius:8px;flex-direction:column;min-width:200px;padding:10px 0;transition:all .3s;display:flex;position:absolute;top:100%;left:0;transform:translateY(10px);box-shadow:0 10px 25px #0000001a}.dropdown-item{color:#4b5563;align-items:center;gap:10px;padding:12px 20px;font-size:.95rem;text-decoration:none;transition:background-color .2s,color .2s;display:flex}.dropdown-item:hover{color:#1d4ed8;background-color:#f3f4f6;font-weight:500}.action-menu-container{z-index:100;background-color:#fff;border:1px solid #e5e7eb;border-radius:8px;min-width:140px;padding:8px 0;animation:.2s ease-out fadeIn;position:absolute;top:25px;right:0;box-shadow:0 4px 12px #00000026}.action-menu-btn{cursor:pointer;color:#374151;text-align:left;white-space:nowrap;background:0 0;border:none;align-items:center;width:100%;padding:10px 16px;font-size:.95rem;font-weight:500;transition:background-color .2s;display:flex}.action-menu-btn i{width:20px;margin-right:8px}.action-menu-btn:hover{background-color:#f3f4f6}.action-menu-btn.btn-edit:hover i{color:#3b82f6}.action-menu-btn.btn-delete{color:#ef4444}.action-menu-btn.btn-delete:hover{background-color:#fef2f2}@keyframes 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(width<=768px){.listening-content{flex-direction:column}.listening-left,.listening-right{flex:100%}}#sec-media{background:#f5f7fb;min-height:calc(100vh - 80px);padding:60px 0}.media-container{width:min(92%,1200px);margin:auto}.media-header{text-align:center;margin-bottom:40px}.media-header h2{color:#2c3e50;margin-bottom:12px;font-size:38px}.media-header p{color:#666;font-size:18px}.media-loading,.media-empty{text-align:center;color:#888;background:#fff;border-radius:18px;padding:60px 20px;font-size:1.2rem;box-shadow:0 4px 15px #0000000d}.media-empty i{color:#cbd5e1;margin-bottom:15px;font-size:3rem;display:block}.media-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:30px;display:grid}.media-card-link{color:inherit;text-decoration:none;display:block}.media-card{background:#fff;border-radius:16px;flex-direction:column;height:100%;transition:transform .3s,box-shadow .3s;display:flex;overflow:hidden;box-shadow:0 4px 20px 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tr:hover{background-color:#f1f5f9}.admin-table tbody tr:nth-child(2n){background-color:#f8fafc}.admin-table-empty{text-align:center;color:#64748b;padding:32px!important}.text-nowrap{white-space:nowrap}.text-ellipsis{white-space:nowrap;text-overflow:ellipsis;max-width:200px;overflow:hidden}.badge{color:#475569;background:#e2e8f0;border-radius:9999px;padding:4px 12px;font-size:12px;font-weight:600}.badge-green{color:#047857;background:#d1fae5}.badge-purple{color:#7e22ce;background:#f3e8ff}.btn-edit-sm{color:#2563eb;cursor:pointer;background:#eff6ff;border:none;border-radius:6px;margin-right:8px;padding:6px 12px;font-size:13px}.btn-edit-sm:hover{background:#dbeafe}.btn-del-sm{color:#dc2626;cursor:pointer;background:#fef2f2;border:none;border-radius:6px;padding:6px 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label{color:#475569;font-size:14px;font-weight:600}.admin-input{border:1px solid #cbd5e1;border-radius:8px;outline:none;padding:10px 12px;font-size:14px;transition:border-color .2s}.admin-input:focus{border-color:#4f46e5;box-shadow:0 0 0 2px #4f46e51a}.admin-modal-footer{background:#f8fafc;border-top:1px solid #e2e8f0;justify-content:flex-end;gap:12px;padding:16px 24px;display:flex}.btn-secondary{color:#475569;cursor:pointer;background:#fff;border:1px solid #cbd5e1;border-radius:8px;padding:10px 20px;font-size:14px;font-weight:500}.btn-secondary:hover{background:#f1f5f9}@media (width<=768px){.admin-body{flex-direction:column}.admin-sidebar{flex-direction:row;width:100%;height:auto;overflow-x:auto}.admin-sidebar-logo{display:none}.admin-sidebar-nav{flex-direction:row;gap:10px;padding:10px}.admin-nav-item{justify-content:center;width:auto;padding:10px 14px}.admin-nav-item span,.admin-sidebar-footer{display:none}.admin-main{width:100%}.admin-content{padding:10px}.admin-stats-grid,.admin-form-grid{grid-template-columns:1fr}.admin-form-group.full-width{grid-column:1/-1}}.auth-page-container{background:linear-gradient(135deg,#fdfbfb 0%,#ebedee 100%);justify-content:center;align-items:center;min-height:calc(100vh - 160px);padding:40px 20px;display:flex}.auth-card{text-align:center;background:#fff;border-radius:20px;width:100%;max-width:420px;padding:40px;box-shadow:0 10px 30px #00000014}.auth-card h2{color:var(--primary);margin-top:0;margin-bottom:10px;font-size:28px}.auth-subtitle{color:var(--text-light);margin-bottom:30px;font-size:14px}.auth-error{color:#fff;text-align:left;background-color:#ff7675;border-radius:8px;align-items:center;gap:10px;margin-bottom:20px;padding:12px;font-size:14px;display:flex}.auth-form{text-align:left}.auth-form .form-group{margin-bottom:20px}.auth-form 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span{color:var(--primary);cursor:pointer;font-weight:700;transition:color .3s}.auth-toggle span:hover{color:#e84393}.profile-container{padding:40px 0;animation:.4s fadeIn}.profile-header{margin-bottom:30px}.profile-title{color:var(--text-dark);margin:0;font-size:2rem;font-weight:800}.profile-grid{grid-template-columns:1fr;gap:30px;display:grid}@media (width>=992px){.profile-grid{grid-template-columns:320px 1fr}}.profile-sidebar{text-align:center;background:#fff;border-radius:20px;height:fit-content;padding:40px 30px;box-shadow:0 10px 30px #00000008}.profile-avatar-large{background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;border:5px solid #fff;border-radius:50%;justify-content:center;align-items:center;width:130px;height:130px;margin:0 auto 20px;font-size:4rem;font-weight:700;display:flex;box-shadow:0 10px 25px #6c5ce74d}.profile-username{color:var(--text-dark);margin:0 0 5px;font-size:1.5rem;font-weight:800}.profile-role{color:#636e72;background:var(--bg-light);border-radius:20px;margin-bottom:30px;padding:5px 15px;font-size:.9rem;font-weight:600;display:inline-block}.profile-tabs{flex-direction:column;gap:10px;display:flex}.profile-tab{color:#4b5563;cursor:pointer;text-align:left;background:0 0;border:1px solid #0000;border-radius:12px;align-items:center;gap:15px;padding:14px 20px;font-weight:600;transition:all .2s;display:flex}.profile-tab:hover{background:var(--bg-light);color:var(--primary)}.profile-tab.active{background:var(--primary);color:#fff;box-shadow:0 5px 15px #6c5ce733}.profile-content{background:#fff;border-radius:20px;padding:40px;box-shadow:0 10px 30px #00000008}.profile-section-title{color:var(--text-dark);border-bottom:2px solid var(--bg-light);margin-top:0;margin-bottom:30px;padding-bottom:15px;font-size:1.4rem;font-weight:700}.profile-form-grid{grid-template-columns:1fr;gap:25px;display:grid}@media (width>=768px){.profile-form-grid{grid-template-columns:1fr 1fr}}.profile-input-group{flex-direction:column;gap:10px;display:flex}.profile-input-group label{color:#2d3436;font-size:.95rem;font-weight:700}.profile-input{color:#2d3436;background-color:#f9fafb;border:2px solid #dfe6e9;border-radius:12px;outline:none;padding:14px 18px;font-size:1rem;transition:all .2s}.profile-input:focus{border-color:var(--primary);background-color:#fff;box-shadow:0 0 0 4px #6c5ce71a}.profile-input:read-only{color:#636e72;cursor:not-allowed;background-color:#e5e7eb;border-color:#dfe6e9}.profile-actions{justify-content:flex-end;margin-top:40px;display:flex}