:root{--primary: #4f46e5;--primary-dark: #3730a3;--primary-light: #e0e7ff;--secondary: #06b6d4;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--info: #3b82f6;--dark: #1e293b;--gray: #64748b;--light-gray: #f1f5f9;--border: #e2e8f0;--white: #ffffff;--bg: #f1f5f9;--card-bg: #ffffff;--text: #1e293b;--text-muted: #64748b;--sidebar-bg: #1e293b;--shadow-sm: 0 1px 3px rgba(0,0,0,.08);--shadow-md: 0 4px 12px rgba(0,0,0,.1);--shadow-lg: 0 8px 24px rgba(0,0,0,.12);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--sidebar-w: 240px;--transition: background .3s, color .3s, border-color .3s}[data-theme=dark]{--bg: #0f172a;--card-bg: #1e293b;--text: #f1f5f9;--text-muted: #94a3b8;--border: #334155;--light-gray: #1e293b;--white: #1e293b;--dark: #f1f5f9;--sidebar-bg: #0f172a}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;transition:var(--transition);min-height:100vh}a{color:var(--primary);text-decoration:none;transition:color .2s}a:hover{color:var(--primary-dark)}img{max-width:100%;display:block}ul,ol{list-style:none}button{font-family:inherit;cursor:pointer}input,textarea,select{font-family:inherit}h1,h2,h3,h4,h5,h6{color:var(--text);line-height:1.3;font-weight:700}.app-layout{display:flex;min-height:100vh}.main-content{flex:1;margin-left:var(--sidebar-w);display:flex;flex-direction:column;min-height:100vh;background:var(--bg);transition:var(--transition)}.page-body{flex:1;padding:24px 28px;background:var(--bg);transition:var(--transition)}@media (max-width: 768px){.main-content{margin-left:0}.page-body{padding:16px}}.header-bar{display:flex;align-items:center;justify-content:flex-end;gap:12px;padding:12px 20px;background:var(--card-bg);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50;transition:var(--transition)}.sidebar{width:var(--sidebar-w);background:var(--sidebar-bg);position:fixed;top:0;left:0;height:100vh;display:flex;flex-direction:column;overflow-y:auto;overflow-x:hidden;z-index:100;transition:transform .3s ease,background .3s;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.1) transparent}.sidebar::-webkit-scrollbar{width:4px}.sidebar::-webkit-scrollbar-thumb{background:#ffffff26;border-radius:2px}.sidebar-logo{padding:24px 20px 16px;border-bottom:1px solid rgba(255,255,255,.08)}.sidebar-logo h2{font-size:1.6rem;font-weight:800;color:#fff;letter-spacing:-.5px}.sidebar-logo h2 span{color:#818cf8}.sidebar-user{display:flex;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid rgba(255,255,255,.08)}.user-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#7c3aed);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;color:#fff;flex-shrink:0}.user-info .name{font-size:.875rem;font-weight:600;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:150px}.user-info .role{font-size:.72rem;color:#ffffff80;text-transform:capitalize}.sidebar-nav{flex:1;padding:12px 0}.nav-section-title{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:#ffffff59;padding:8px 20px 4px}.nav-link{display:flex;align-items:center;gap:10px;padding:10px 20px;color:#ffffffa6;font-size:.875rem;font-weight:500;transition:all .2s;border-left:3px solid transparent;text-decoration:none}.nav-link:hover{background:#ffffff12;color:#fff;border-left-color:#ffffff4d}.nav-link.active{background:#4f46e540;color:#fff;border-left-color:var(--primary);font-weight:600}.nav-link .icon{font-size:1rem;width:20px;text-align:center;flex-shrink:0}.sidebar-footer{padding:16px 20px;border-top:1px solid rgba(255,255,255,.08)}.logout-btn{width:100%;padding:10px 16px;background:#ef444426;color:#fca5a5;border:1px solid rgba(239,68,68,.25);border-radius:var(--radius-sm);font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s;text-align:left}.logout-btn:hover{background:#ef444447;color:#fff}.mobile-menu-btn{display:none;position:fixed;top:14px;left:14px;z-index:200;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-sm);width:38px;height:38px;font-size:1.1rem;align-items:center;justify-content:center;box-shadow:var(--shadow-md)}@media (max-width: 768px){.mobile-menu-btn{display:flex}.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0);box-shadow:var(--shadow-lg)}}.page-header{margin-bottom:24px}.page-header h1{font-size:1.6rem;font-weight:800;color:var(--text);margin-bottom:4px}.page-header p{color:var(--text-muted);font-size:.9rem}.card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 24px;box-shadow:var(--shadow-sm);transition:var(--transition)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:8px}.card-title{font-size:1rem;font-weight:700;color:var(--text)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;display:flex;align-items:center;gap:16px;box-shadow:var(--shadow-sm);transition:var(--transition),transform .2s}.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.stat-icon{width:48px;height:48px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.4rem;flex-shrink:0}.stat-icon.blue{background:#dbeafe}.stat-icon.green{background:#d1fae5}.stat-icon.yellow{background:#fef3c7}.stat-icon.purple{background:#ede9fe}.stat-icon.cyan{background:#cffafe}.stat-icon.red{background:#fee2e2}[data-theme=dark] .stat-icon.blue{background:#3b82f633}[data-theme=dark] .stat-icon.green{background:#10b98133}[data-theme=dark] .stat-icon.yellow{background:#f59e0b33}[data-theme=dark] .stat-icon.purple{background:#8b5cf633}[data-theme=dark] .stat-icon.cyan{background:#06b6d433}[data-theme=dark] .stat-icon.red{background:#ef444433}.stat-info .value{font-size:1.6rem;font-weight:800;color:var(--text);line-height:1}.stat-info .label{font-size:.78rem;color:var(--text-muted);margin-top:4px;font-weight:500}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 18px;border-radius:var(--radius-sm);font-size:.875rem;font-weight:600;border:1px solid transparent;cursor:pointer;transition:all .2s;white-space:nowrap;text-decoration:none;line-height:1}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover:not(:disabled){background:var(--primary-dark);border-color:var(--primary-dark);color:#fff}.btn-secondary{background:var(--light-gray);color:var(--text);border-color:var(--border)}.btn-secondary:hover:not(:disabled){background:var(--border);color:var(--text)}[data-theme=dark] .btn-secondary{background:#334155;color:var(--text);border-color:#475569}[data-theme=dark] .btn-secondary:hover:not(:disabled){background:#475569}.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}.btn-danger:hover:not(:disabled){background:#dc2626;border-color:#dc2626}.btn-success{background:var(--success);color:#fff;border-color:var(--success)}.btn-success:hover:not(:disabled){background:#059669;border-color:#059669}.btn-sm{padding:5px 12px;font-size:.8rem}.btn-lg{padding:12px 24px;font-size:1rem}.w-full{width:100%}.form-group{margin-bottom:16px}.form-label{display:block;font-size:.85rem;font-weight:600;color:var(--text);margin-bottom:6px}.form-control{width:100%;padding:9px 13px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.875rem;color:var(--text);background:var(--card-bg);transition:border-color .2s,box-shadow .2s,background .3s,color .3s;outline:none}.form-control:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51f}.form-control:disabled{background:var(--light-gray);cursor:not-allowed;opacity:.7}[data-theme=dark] .form-control{background:#0f172a;border-color:#334155;color:var(--text)}[data-theme=dark] .form-control:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e533}[data-theme=dark] .form-control:disabled{background:#1e293b}textarea.form-control{resize:vertical;min-height:80px}select.form-control{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}.role-selector{display:flex;gap:10px;flex-wrap:wrap}.role-option{display:none}.role-label{display:flex;align-items:center;gap:6px;padding:8px 16px;border:2px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;font-size:.875rem;font-weight:600;color:var(--text-muted);transition:all .2s;background:var(--card-bg)}.role-label:hover{border-color:var(--primary);color:var(--primary)}.role-option:checked+.role-label{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}[data-theme=dark] .role-option:checked+.role-label{background:#4f46e533}.role-icon{font-size:1rem}.divider{height:1px;background:var(--border);margin:20px 0}.table-wrapper{overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--border)}table{width:100%;border-collapse:collapse;font-size:.875rem}thead{background:var(--light-gray);transition:background .3s}[data-theme=dark] thead{background:#0f172a}th{padding:11px 16px;text-align:left;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);white-space:nowrap;border-bottom:1px solid var(--border)}td{padding:12px 16px;color:var(--text);border-bottom:1px solid var(--border);vertical-align:middle}tbody tr{background:var(--card-bg);transition:background .15s}tbody tr:last-child td{border-bottom:none}tbody tr:hover{background:var(--light-gray)}[data-theme=dark] tbody tr:hover{background:#0f172a}.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:.72rem;font-weight:700;text-transform:capitalize;white-space:nowrap}.badge-success{background:#d1fae5;color:#065f46}.badge-warning{background:#fef3c7;color:#92400e}.badge-danger{background:#fee2e2;color:#991b1b}.badge-info{background:#dbeafe;color:#1e40af}.badge-purple{background:#ede9fe;color:#5b21b6}.badge-secondary{background:var(--light-gray);color:var(--text-muted)}[data-theme=dark] .badge-success{background:#10b98133;color:#6ee7b7}[data-theme=dark] .badge-warning{background:#f59e0b33;color:#fcd34d}[data-theme=dark] .badge-danger{background:#ef444433;color:#fca5a5}[data-theme=dark] .badge-info{background:#3b82f633;color:#93c5fd}[data-theme=dark] .badge-purple{background:#8b5cf633;color:#c4b5fd}[data-theme=dark] .badge-secondary{background:#334155;color:#94a3b8}.alert{display:flex;align-items:center;gap:10px;padding:12px 16px;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;margin-bottom:16px;border:1px solid transparent}.alert-success{background:#d1fae5;color:#065f46;border-color:#a7f3d0}.alert-error{background:#fee2e2;color:#991b1b;border-color:#fecaca}.alert-warning{background:#fef3c7;color:#92400e;border-color:#fde68a}.alert-info{background:#dbeafe;color:#1e40af;border-color:#bfdbfe}[data-theme=dark] .alert-success{background:#10b98126;color:#6ee7b7;border-color:#10b9814d}[data-theme=dark] .alert-error{background:#ef444426;color:#fca5a5;border-color:#ef44444d}[data-theme=dark] .alert-warning{background:#f59e0b26;color:#fcd34d;border-color:#f59e0b4d}[data-theme=dark] .alert-info{background:#3b82f626;color:#93c5fd;border-color:#3b82f64d}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;width:100%;max-width:520px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg);transition:background .3s,border-color .3s}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid var(--border)}.modal-title{font-size:1.1rem;font-weight:700;color:var(--text)}.modal-close{background:var(--light-gray);border:none;border-radius:var(--radius-sm);width:30px;height:30px;display:flex;align-items:center;justify-content:center;font-size:.9rem;color:var(--text-muted);cursor:pointer;transition:all .2s}.modal-close:hover{background:var(--border);color:var(--text)}.loading-inline{display:flex;align-items:center;justify-content:center;gap:12px;padding:60px 20px;color:var(--text-muted);font-size:.9rem}.spinner{width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0}@keyframes spin{to{transform:rotate(360deg)}}.progress-bar{height:10px;background:var(--border);border-radius:5px;overflow:hidden}.progress-fill{height:100%;border-radius:5px;transition:width .8s ease;background:var(--primary)}.empty-state{text-align:center;padding:48px 20px;color:var(--text-muted)}.empty-state .icon{font-size:2.8rem;margin-bottom:12px}.empty-state h3{font-size:1rem;font-weight:700;color:var(--text);margin-bottom:6px}.empty-state p{font-size:.875rem;color:var(--text-muted);margin-bottom:16px}.mt-3{margin-top:12px}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#4f46e5,#7c3aed,#06b6d4);padding:20px}[data-theme=dark] .auth-page{background:linear-gradient(135deg,#4f46e5,#7c3aed,#06b6d4)}.auth-card{background:#fff;border-radius:var(--radius-lg);padding:40px 36px;width:100%;max-width:420px;box-shadow:0 20px 60px #0003}[data-theme=dark] .auth-card{background:#1e293b;border:1px solid #334155}.auth-logo{text-align:center;margin-bottom:28px}.auth-logo h1{font-size:2rem;font-weight:900;color:var(--primary);letter-spacing:-1px}.auth-logo p{font-size:.8rem;color:var(--text-muted);margin-top:4px}.auth-title{font-size:1.4rem;font-weight:800;color:var(--text);margin-bottom:4px}.auth-subtitle{font-size:.875rem;color:var(--text-muted);margin-bottom:24px}.auth-footer{text-align:center;margin-top:20px;font-size:.875rem;color:var(--text-muted)}.auth-footer a{color:var(--primary);font-weight:600}.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}.course-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);transition:var(--transition),transform .2s,box-shadow .2s;display:flex;flex-direction:column}.course-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.course-card-header{background:linear-gradient(135deg,var(--primary),#7c3aed);padding:20px;color:#fff}.course-card-header h3{font-size:1rem;font-weight:700;color:#fff;margin-bottom:4px}.course-card-header p{font-size:.8rem;opacity:.85;color:#ffffffd9}.course-card-body{padding:16px 20px 20px;flex:1;display:flex;flex-direction:column;gap:12px}.course-meta{display:flex;flex-direction:column;gap:6px}.course-meta-item{display:flex;align-items:center;gap:6px;font-size:.82rem;color:var(--text-muted)}.course-meta-item span{color:var(--text)}.attendance-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:20px}.att-stat{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;text-align:center;transition:var(--transition)}.att-stat .value{font-size:2rem;font-weight:800;line-height:1;margin-bottom:6px}.att-stat .label{font-size:.8rem;color:var(--text-muted);font-weight:500}.att-stat.present .value{color:var(--success)}.att-stat.absent .value{color:var(--danger)}.att-stat.percent .value{color:var(--primary)}.insight-card{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border-radius:var(--radius-md);font-size:.875rem;line-height:1.55;border-left:4px solid transparent;background:var(--light-gray);color:var(--text);transition:background .3s}.insight-card.success{background:#d1fae5;border-left-color:var(--success);color:#065f46}.insight-card.warning{background:#fef3c7;border-left-color:var(--warning);color:#92400e}.insight-card.danger{background:#fee2e2;border-left-color:var(--danger);color:#991b1b}.insight-card.info{background:#dbeafe;border-left-color:var(--info);color:#1e40af}[data-theme=dark] .insight-card.success{background:#10b98126;color:#6ee7b7}[data-theme=dark] .insight-card.warning{background:#f59e0b26;color:#fcd34d}[data-theme=dark] .insight-card.danger{background:#ef444426;color:#fca5a5}[data-theme=dark] .insight-card.info{background:#3b82f626;color:#93c5fd}.chatbot-toggle{position:fixed;bottom:24px;right:24px;width:52px;height:52px;border-radius:50%;border:none;color:#fff;font-size:1.3rem;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 16px #4f46e566;z-index:500;cursor:pointer;transition:all .2s}.chatbot-toggle:hover{transform:scale(1.08);box-shadow:0 6px 20px #4f46e580}.chatbot-window{position:fixed;bottom:88px;right:24px;width:360px;background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:499;display:flex;flex-direction:column;overflow:hidden;transition:background .3s,border-color .3s}.chatbot-header{padding:14px 16px;display:flex;align-items:center;gap:10px;color:#fff}.chatbot-header h4{color:#fff}.chatbot-messages{flex:1;overflow-y:auto;background:var(--bg);transition:background .3s;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.chatbot-messages::-webkit-scrollbar{width:4px}.chatbot-messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.chat-msg{padding:10px 13px;border-radius:16px;font-size:.84rem;line-height:1.55;max-width:88%;word-break:break-word}.chat-msg.user{background:var(--primary);color:#fff;align-self:flex-end}.chat-msg.bot{background:var(--card-bg);color:var(--text);border:1px solid var(--border)}[data-theme=dark] .chat-msg.bot{background:#334155;border-color:#475569}.chatbot-input{display:flex;align-items:center;gap:8px;padding:10px 12px;border-top:1px solid var(--border);background:var(--card-bg);transition:background .3s,border-color .3s}.chatbot-input input{flex:1;border:1px solid var(--border);border-radius:22px;padding:8px 14px;font-size:.84rem;background:var(--bg);color:var(--text);outline:none;transition:border-color .2s,background .3s,color .3s}.chatbot-input input:focus{border-color:var(--primary)}@media (max-width: 480px){.chatbot-window{width:calc(100vw - 32px);right:16px;bottom:80px}}.notification-bell{position:relative;background:none;border:none;width:38px;height:38px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1.15rem;color:var(--text-muted);cursor:pointer;transition:background .2s,color .2s}.notification-bell:hover{background:var(--light-gray);color:var(--text)}[data-theme=dark] .notification-bell:hover{background:#334155}.notification-bell .badge-dot{position:absolute;top:6px;right:6px;width:8px;height:8px;background:var(--danger);border-radius:50%;border:2px solid var(--card-bg)}.notification-dropdown{position:absolute;top:calc(100% + 8px);right:0;width:340px;background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:300;overflow:hidden;transition:background .3s,border-color .3s}.notification-dropdown-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--border)}.notification-dropdown-header h4{font-size:.9rem;font-weight:700;color:var(--text)}.notification-dropdown-header button{background:none;border:none;font-size:.78rem;color:var(--primary);cursor:pointer;font-weight:600}.notification-dropdown-header button:hover{text-decoration:underline}.notification-list{max-height:320px;overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.notification-list::-webkit-scrollbar{width:4px}.notification-list::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.notification-item{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .15s;background:var(--card-bg)}.notification-item:last-child{border-bottom:none}.notification-item:hover{background:var(--light-gray)}[data-theme=dark] .notification-item:hover{background:#0f172a}.notification-item.unread{background:var(--primary-light);border-left:3px solid var(--primary)}[data-theme=dark] .notification-item.unread{background:#4f46e51f;border-left-color:var(--primary)}.notification-item.unread:hover{background:#c7d2fe}[data-theme=dark] .notification-item.unread:hover{background:#4f46e533}.notification-icon{width:34px;height:34px;border-radius:50%;background:var(--light-gray);display:flex;align-items:center;justify-content:center;font-size:.95rem;flex-shrink:0}[data-theme=dark] .notification-icon{background:#334155}.notification-content{flex:1;min-width:0}.notification-content p{font-size:.82rem;color:var(--text);line-height:1.45;margin-bottom:3px}.notification-content .notification-time{font-size:.72rem;color:var(--text-muted)}.notification-dropdown-footer{padding:10px 16px;text-align:center;border-top:1px solid var(--border)}.notification-dropdown-footer a{font-size:.82rem;color:var(--primary);font-weight:600}.dark-toggle{background:none;border:1px solid var(--border);border-radius:var(--radius-sm);width:38px;height:38px;display:flex;align-items:center;justify-content:center;font-size:1rem;color:var(--text-muted);cursor:pointer;transition:background .2s,color .2s,border-color .2s}.dark-toggle:hover{background:var(--light-gray);color:var(--text);border-color:var(--primary)}[data-theme=dark] .dark-toggle:hover{background:#334155}@keyframes shimmer{0%{background-position:-400px 0}to{background-position:400px 0}}.skeleton{background:linear-gradient(90deg,var(--border) 25%,var(--light-gray) 50%,var(--border) 75%);background-size:800px 100%;animation:shimmer 1.4s infinite linear;border-radius:var(--radius-sm)}[data-theme=dark] .skeleton{background:linear-gradient(90deg,#334155 25%,#475569,#334155 75%);background-size:800px 100%;animation:shimmer 1.4s infinite linear}.skeleton-line{height:14px;border-radius:7px;margin-bottom:10px}.skeleton-line:last-child{margin-bottom:0}.skeleton-line.short{width:40%}.skeleton-line.medium{width:65%}.skeleton-line.long{width:90%}.skeleton-line.full{width:100%}.skeleton-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 24px}.skeleton-avatar{width:40px;height:40px;border-radius:50%}.skeleton-title{height:20px;border-radius:10px;width:55%;margin-bottom:12px}.file-upload-area{border:2px dashed var(--border);border-radius:var(--radius-lg);padding:40px 24px;text-align:center;cursor:pointer;transition:border-color .2s,background .2s;background:var(--light-gray);color:var(--text-muted)}.file-upload-area:hover{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}[data-theme=dark] .file-upload-area:hover{background:#4f46e51a}.file-upload-area.dragging{border-color:var(--primary);background:var(--primary-light);color:var(--primary);box-shadow:0 0 0 4px #4f46e526;transform:scale(1.01)}[data-theme=dark] .file-upload-area.dragging{background:#4f46e526}.file-upload-area .upload-icon{font-size:2.4rem;margin-bottom:12px;display:block}.file-upload-area p{font-size:.9rem;font-weight:500;margin-bottom:4px}.file-upload-area span{font-size:.78rem;color:var(--text-muted)}.report-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;box-shadow:var(--shadow-sm);transition:var(--transition),box-shadow .2s}.report-card:hover{box-shadow:var(--shadow-md)}.report-card-info{display:flex;align-items:center;gap:14px}.report-card-icon{width:44px;height:44px;border-radius:var(--radius-md);background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0}[data-theme=dark] .report-card-icon{background:#4f46e533}.report-card-info h4{font-size:.9rem;font-weight:700;color:var(--text);margin-bottom:2px}.report-card-info p{font-size:.78rem;color:var(--text-muted)}.export-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-sm);font-size:.82rem;font-weight:600;cursor:pointer;transition:background .2s,transform .15s;white-space:nowrap;flex-shrink:0}.export-btn:hover{background:var(--primary-dark);transform:translateY(-1px)}.export-btn:active{transform:translateY(0)}.export-btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.export-btn.secondary{background:var(--light-gray);color:var(--text);border:1px solid var(--border)}.export-btn.secondary:hover{background:var(--border)}[data-theme=dark] .export-btn.secondary{background:#334155;border-color:#475569}@media (max-width: 1024px){.stats-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width: 768px){.main-content{padding:64px 16px 16px}.stats-grid{grid-template-columns:repeat(2,1fr);gap:12px}.courses-grid{grid-template-columns:1fr}.attendance-summary{grid-template-columns:repeat(3,1fr);gap:10px}.card{padding:16px}.modal{padding:20px}.notification-dropdown{width:calc(100vw - 32px);right:-8px}.report-card{flex-direction:column;align-items:flex-start}.export-btn{width:100%;justify-content:center}}@media (max-width: 480px){.page-header h1{font-size:1.3rem}.stats-grid{grid-template-columns:1fr 1fr}.stat-card{padding:14px;gap:10px}.stat-info .value{font-size:1.3rem}.attendance-summary{grid-template-columns:1fr}.auth-card{padding:28px 20px}.btn-lg{padding:10px 18px;font-size:.9rem}}.text-muted{color:var(--text-muted)}.text-primary{color:var(--primary)}.text-success{color:var(--success)}.text-danger{color:var(--danger)}.text-warning{color:var(--warning)}.text-center{text-align:center}.text-right{text-align:right}.font-bold{font-weight:700}.font-semibold{font-weight:600}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.mb-2{margin-bottom:8px}.mb-3{margin-bottom:12px}.mb-4{margin-bottom:16px}.mb-5{margin-bottom:20px}.mt-2{margin-top:8px}.mt-4{margin-top:16px}.mt-5{margin-top:20px}.p-0{padding:0}.rounded{border-radius:var(--radius-md)}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--gray)}::selection{background:var(--primary-light);color:var(--primary-dark)}[data-theme=dark] ::selection{background:#4f46e559;color:#e0e7ff}:focus-visible{outline:2px solid var(--primary);outline-offset:2px}@media print{.sidebar,.chatbot-toggle,.chatbot-window,.mobile-menu-btn,.header-bar{display:none!important}.main-content{margin-left:0;padding:0}.card{box-shadow:none;border:1px solid #e2e8f0}}