:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;min-width:320px;min-height:100vh}#root{width:100%}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;margin:0;padding:0;background-color:#f0f2f5;color:#333}.app{min-height:100vh;display:flex;flex-direction:column}.login-container{display:flex;justify-content:center;align-items:center;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2)}.login-card{background:#fff;padding:2rem;border-radius:15px;box-shadow:0 10px 25px #0003;width:100%;max-width:400px}.login-header{text-align:center;margin-bottom:2rem}.login-header h1{font-size:1.5rem;color:#333;margin-bottom:.5rem}.login-tabs{display:flex;margin-bottom:1.5rem;border-bottom:2px solid #eee}.login-tab{flex:1;padding:10px;border:none;background:none;cursor:pointer;font-weight:600;color:#666;transition:all .3s}.login-tab.active{color:#667eea;border-bottom:2px solid #667eea}.admin-dashboard{display:flex;min-height:100vh}.sidebar{width:260px;background:#2c3e50;color:#fff;display:flex;flex-direction:column;position:fixed;height:100vh;overflow-y:auto}.sidebar-header{padding:20px;background:#1a252f;text-align:center}.sidebar-menu{flex:1;padding:20px 0}.sidebar-item{display:flex;align-items:center;width:100%;padding:15px 20px;border:none;background:none;color:#bdc3c7;cursor:pointer;text-align:left;transition:all .3s;font-size:1rem}.sidebar-item:hover,.sidebar-item.active{background:#34495e;color:#fff;border-left:4px solid #3498db}.sidebar-item .icon{margin-right:10px;width:24px;text-align:center}.sidebar-footer{padding:20px;border-top:1px solid #34495e}.dashboard-content{flex:1;margin-left:260px;padding:20px;background:#f0f2f5}.content-header{background:#fff;padding:15px 25px;border-radius:10px;box-shadow:0 2px 5px #0000000d;margin-bottom:20px;display:flex;justify-content:space-between;align-items:center}.teacher-dashboard{padding:20px}.dashboard-header{background:#fff;padding:15px 25px;border-radius:10px;box-shadow:0 2px 5px #0000000d;margin-bottom:20px;display:flex;justify-content:space-between;align-items:center}.user-info{margin-right:20px;font-size:1.1rem}.panel{background:#fff;padding:25px;border-radius:10px;box-shadow:0 2px 10px #0000000d;margin-bottom:20px}.form-group{margin-bottom:15px}.form-group label{display:block;margin-bottom:5px;font-weight:500;color:#555}.form-control{width:100%;padding:10px;border:1px solid #ddd;border-radius:5px;font-size:1rem;box-sizing:border-box}.btn{padding:10px 20px;border:none;border-radius:5px;cursor:pointer;font-weight:600;transition:all .3s;font-size:1rem}.btn-primary{background:#3498db;color:#fff}.btn-primary:hover{background:#2980b9}.btn-secondary{background:#95a5a6;color:#fff}.btn-secondary:hover{background:#7f8c8d}.btn-success{background:#2ecc71;color:#fff}.btn-success:hover{background:#27ae60}.btn-danger{background:#e74c3c;color:#fff}.btn-danger:hover{background:#c0392b}.btn-warning{background:#f1c40f;color:#fff}.btn-warning:hover{background:#f39c12}.btn-info{background:#17a2b8;color:#fff}.btn-info:hover{background:#138496}.btn-block{width:100%}.alert{padding:10px;border-radius:5px;margin-bottom:15px}.alert-error{background:#fee2e2;color:#c0392b;border:1px solid #fecaca}.alert-success{background:#d1fae5;color:#047857;border:1px solid #a7f3d0}.alert-info{background:#e0f2fe;color:#0369a1;border:1px solid #bae6fd}.logout-btn{width:100%;padding:10px;background:#c0392b;color:#fff;border:none;border-radius:5px;cursor:pointer;transition:background .3s}.logout-btn:hover{background:#a93226}table{width:100%;border-collapse:collapse;margin-top:10px}th,td{padding:12px;text-align:left;border-bottom:1px solid #eee}th{background-color:#f8f9fa;font-weight:600;color:#555}tr:hover{background-color:#f9f9f9}