.snackbar-container{position:fixed;top:20px;right:20px;z-index:9999;display:flex;flex-direction:column;gap:12px;pointer-events:none}.snackbar-item{display:flex;align-items:center;gap:var(--spacing-sm);min-width:320px;max-width:480px;padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-lg);box-shadow:0 8px 32px #0000001f;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.1);font-size:var(--font-size-sm);font-weight:500;pointer-events:all;transform:translate(100%);opacity:0;transition:all .3s cubic-bezier(.4,0,.2,1)}.snackbar-item.snackbar-visible{transform:translate(0);opacity:1}.snackbar-item.snackbar-removing{transform:translate(100%);opacity:0}.snackbar-icon{display:flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:50%;font-size:12px;font-weight:700;flex-shrink:0}.snackbar-message{flex:1;line-height:1.4;word-break:break-word}.snackbar-close{background:none;border:none;color:inherit;cursor:pointer;padding:4px;border-radius:4px;font-size:14px;opacity:.7;transition:opacity .2s ease;flex-shrink:0}.snackbar-close:hover{opacity:1;background:#ffffff1a}.snackbar-success{background:#10b981f2;color:#fff;border-color:#10b9814d}.snackbar-success .snackbar-icon{background:#fff3;color:#fff}.snackbar-error{background:#ef4444f2;color:#fff;border-color:#ef44444d}.snackbar-error .snackbar-icon{background:#fff3;color:#fff}.snackbar-warning{background:#f59e0bf2;color:#fff;border-color:#f59e0b4d}.snackbar-warning .snackbar-icon{background:#fff3;color:#fff}.snackbar-info{background:#3b82f6f2;color:#fff;border-color:#3b82f64d}.snackbar-info .snackbar-icon{background:#fff3;color:#fff}@media (max-width: 768px){.snackbar-container{top:10px;right:10px;left:10px}.snackbar-item{min-width:auto;max-width:none}}.auth-form{max-width:400px;margin:0 auto;padding:var(--spacing-2xl);background:var(--color-white);border-radius:var(--radius-2xl);box-shadow:0 20px 60px #00000026;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2)}.auth-form h2{text-align:center;margin-bottom:var(--spacing-xl);color:var(--color-gray-800);font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold)}.admin-notice{background:linear-gradient(135deg,#e8f4f8,#f0f9ff);border:1px solid #bee5eb;padding:var(--spacing-lg);border-radius:var(--radius-xl);margin-bottom:var(--spacing-xl);font-size:var(--font-size-sm);color:#0c5460;text-align:center;box-shadow:0 4px 12px #0c54601a;display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm)}.notice-icon{font-size:var(--font-size-lg);display:inline-block}.form-group{margin-bottom:var(--spacing-lg);position:relative}.form-group label{display:block;margin-bottom:var(--spacing-sm);font-weight:var(--font-weight-semibold);color:var(--color-gray-700);font-size:var(--font-size-sm)}.form-group input{width:100%;padding:var(--spacing-md);border:2px solid var(--color-gray-200);border-radius:var(--radius-lg);font-size:var(--font-size-base);transition:all .3s cubic-bezier(.4,0,.2,1);background:var(--color-white);box-sizing:border-box}.form-group input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #667eea1a;transform:translateY(-1px)}.form-group input:disabled{background-color:var(--color-gray-50);border-color:var(--color-gray-200);cursor:not-allowed;opacity:.7}.field-error{color:var(--color-error);font-size:var(--font-size-xs);margin-top:var(--spacing-xs);display:flex;align-items:center;gap:var(--spacing-xs)}.error-message{background:linear-gradient(135deg,#fef2f2,#fde8e8);border:1px solid #fecaca;color:var(--color-error);padding:var(--spacing-md);border-radius:var(--radius-lg);margin-bottom:var(--spacing-lg);font-size:var(--font-size-sm);display:flex;align-items:center;gap:var(--spacing-sm);box-shadow:0 4px 12px #ef44441a}.error-message:before{content:"⚠️";font-size:var(--font-size-base);flex-shrink:0}.submit-button{width:100%;padding:var(--spacing-md);background:var(--gradient-primary);color:var(--color-white);border:none;border-radius:var(--radius-lg);font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 4px 15px #667eea4d;position:relative;overflow:hidden}.submit-button:before{content:"";position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:#ffffff4d;transition:width .6s,height .6s;transform:translate(-50%,-50%)}.submit-button:active:before{width:300px;height:300px}.submit-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 25px #667eea66}.submit-button:active:not(:disabled){transform:translateY(0)}.submit-button:disabled{background:var(--color-gray-400);cursor:not-allowed;transform:none;box-shadow:none}.auth-toggle{text-align:center;margin-top:var(--spacing-xl);padding-top:var(--spacing-lg);border-top:1px solid var(--color-gray-200)}.auth-toggle p{margin-bottom:var(--spacing-sm);color:var(--color-gray-600);font-size:var(--font-size-sm)}.toggle-button{background:none;border:none;color:var(--color-primary);text-decoration:none;cursor:pointer;font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);transition:all .2s ease;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-md)}.toggle-button:hover:not(:disabled){color:var(--color-primary-dark);background:#667eea1a}.toggle-button:disabled{color:var(--color-gray-400);cursor:not-allowed}.submit-button.loading{position:relative;color:transparent}.submit-button.loading:after{content:"";position:absolute;top:50%;left:50%;width:20px;height:20px;margin:-10px 0 0 -10px;border:2px solid transparent;border-top:2px solid var(--color-white);border-radius:50%;animation:spin 1s linear infinite}.form-group{position:relative}.form-group input:hover:not(:disabled){border-color:var(--color-gray-300)}.form-group input:not(:-moz-placeholder)+label{transform:translateY(-.5rem);font-size:var(--font-size-xs);color:var(--color-primary)}.form-group input:focus+label,.form-group input:not(:placeholder-shown)+label{transform:translateY(-.5rem);font-size:var(--font-size-xs);color:var(--color-primary)}.form-group.floating-label{position:relative}.form-group.floating-label label{position:absolute;top:var(--spacing-md);left:var(--spacing-md);transition:all .3s cubic-bezier(.4,0,.2,1);pointer-events:none;background:var(--color-white);padding:0 var(--spacing-xs);z-index:1}.form-group.floating-label input:not(:-moz-placeholder)+label{top:-.5rem;font-size:var(--font-size-xs);color:var(--color-primary)}.form-group.floating-label input:focus+label,.form-group.floating-label input:not(:placeholder-shown)+label{top:-.5rem;font-size:var(--font-size-xs);color:var(--color-primary)}.form-group input:valid:not(:-moz-placeholder){border-color:var(--color-success)}.form-group input:valid:not(:placeholder-shown){border-color:var(--color-success)}.form-group input:valid:not(:-moz-placeholder):focus{box-shadow:0 0 0 3px #10b9811a}.form-group input:valid:not(:placeholder-shown):focus{box-shadow:0 0 0 3px #10b9811a}.auth-form{animation:slideUp .6s cubic-bezier(.4,0,.2,1)}@keyframes slideUp{0%{opacity:0;transform:translateY(2rem)}to{opacity:1;transform:translateY(0)}}.form-group{animation:fadeInUp .6s cubic-bezier(.4,0,.2,1) forwards;opacity:0}.form-group:nth-child(1){animation-delay:.1s}.form-group:nth-child(2){animation-delay:.2s}.form-group:nth-child(3){animation-delay:.3s}.form-group:nth-child(4){animation-delay:.4s}.submit-button{animation:fadeInUp .6s cubic-bezier(.4,0,.2,1) forwards;animation-delay:.5s;opacity:0}@keyframes fadeInUp{0%{opacity:0;transform:translateY(1rem)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion: reduce){.auth-form,.form-group,.submit-button{animation:none;opacity:1}.form-group input,.submit-button{transition:none}}@media (max-width: 480px){.auth-form{margin:var(--spacing-md);padding:var(--spacing-xl);max-width:none}.auth-form h2{font-size:var(--font-size-xl)}}.invitation-input{font-family:Courier New,monospace;text-transform:uppercase;letter-spacing:1px;font-weight:var(--font-weight-semibold)}.invitation-input.valid{border-color:var(--color-success);background:#10b9810d}.invitation-input.invalid{border-color:var(--color-error);background:#ef44440d}.field-message{margin-top:var(--spacing-xs);font-size:var(--font-size-sm);display:flex;align-items:center;gap:var(--spacing-xs)}.field-message.success{color:var(--color-success)}.field-message.error{color:var(--color-error)}.field-message.info{color:var(--color-info)}.field-help{margin-top:var(--spacing-xs);font-size:var(--font-size-xs);color:var(--color-gray-500);line-height:1.4}.spinner{animation:spin 1s linear infinite}.registration-disabled{text-align:center;padding:var(--spacing-2xl);background:linear-gradient(135deg,#fef7f0,#fff2e6);border:2px solid #fed7aa;border-radius:var(--radius-2xl);margin:var(--spacing-xl) 0}.disabled-icon{font-size:var(--font-size-4xl);margin-bottom:var(--spacing-lg);opacity:.7}.registration-disabled h2{color:var(--color-warning);margin-bottom:var(--spacing-md);font-size:var(--font-size-xl)}.registration-disabled p{color:var(--color-gray-600);margin-bottom:var(--spacing-xl);line-height:1.6}.registration-disabled .toggle-button{background:var(--gradient-primary);color:var(--color-white);border:none;padding:var(--spacing-sm) var(--spacing-xl);border-radius:var(--radius-lg);font-weight:var(--font-weight-semibold);cursor:pointer;transition:all var(--transition-base);box-shadow:0 4px 15px #667eea4d}.registration-disabled .toggle-button:hover{transform:translateY(-2px);box-shadow:0 8px 25px #667eea66}.account-inactive{text-align:center;max-width:500px;margin:0 auto;padding:var(--spacing-2xl);background:var(--color-white);border-radius:var(--radius-2xl);box-shadow:0 20px 60px #00000026;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2)}.inactive-icon{font-size:4rem;margin-bottom:var(--spacing-lg);display:block;opacity:.7}.account-inactive h1{color:var(--color-red-600);margin-bottom:var(--spacing-xl);font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold)}.inactive-message{margin-bottom:var(--spacing-2xl);color:var(--color-gray-700);line-height:1.6}.inactive-message p{margin-bottom:var(--spacing-md)}.contact-info{background:var(--color-gray-50);padding:var(--spacing-lg);border-radius:var(--radius-lg);margin-bottom:var(--spacing-2xl)}.contact-info h3{color:var(--color-gray-800);margin-bottom:var(--spacing-sm);font-size:var(--font-size-lg)}.contact-info p{color:var(--color-gray-600);font-size:var(--font-size-sm);margin:0}.logout-button{background:linear-gradient(135deg,#3b82f6,#1d4ed8);color:#fff!important;border:none;padding:var(--spacing-md) var(--spacing-xl);border-radius:var(--radius-lg);font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px #3b82f64d;text-decoration:none;display:inline-block}.logout-button:hover{background:linear-gradient(135deg,#1d4ed8,#1e3a8a);transform:translateY(-2px);box-shadow:0 6px 20px #3b82f666;color:#fff!important}.logout-button:active{transform:translateY(0);box-shadow:0 2px 8px #3b82f64d;color:#fff!important}.app{min-height:100vh;background-color:var(--color-bg-light)}.app-container{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:var(--spacing-lg);background:var(--gradient-primary)}.username-input-container{display:flex;align-items:center;justify-content:center;min-height:100vh;background:transparent}.username-input-content{background:var(--color-white);padding:var(--spacing-xl);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);max-width:400px;width:100%}.input-header{text-align:center;margin-bottom:var(--spacing-xl)}.user-icon{font-size:var(--font-size-4xl);margin-bottom:var(--spacing-md);color:var(--color-primary)}.input-header h2{color:var(--color-gray-800);margin-bottom:var(--spacing-xs);font-size:var(--font-size-xl)}.input-header p{color:var(--color-gray-500);font-size:var(--font-size-sm)}.username-form .form-group{margin-bottom:var(--spacing-lg)}.username-form label{display:block;margin-bottom:var(--spacing-xs);color:var(--color-gray-800);font-weight:var(--font-weight-medium)}.username-form input{width:100%;padding:var(--spacing-sm);border:2px solid var(--color-gray-200);border-radius:var(--radius-lg);font-size:var(--font-size-base);transition:border-color var(--transition-base)}.username-form input:focus{outline:none;border-color:var(--color-primary)}.submit-btn{width:100%;padding:var(--spacing-sm);background:var(--gradient-primary);color:var(--color-white);border:none;border-radius:var(--radius-lg);font-size:var(--font-size-base);cursor:pointer;transition:transform var(--transition-base)}.submit-btn:hover:not(:disabled){transform:translateY(-2px)}.submit-btn:disabled{opacity:.6;cursor:not-allowed}.quiz-list h2{color:var(--color-white);margin-bottom:var(--spacing-xl);font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);text-align:center;text-shadow:var(--shadow-text)}.quiz-table-container{background:#fffffff2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-radius:var(--radius-2xl);box-shadow:var(--shadow-xl);overflow:hidden;border:1px solid rgba(255,255,255,.2)}.quiz-table th{font-weight:var(--font-weight-bold);color:var(--color-gray-600);font-size:var(--font-size-sm);text-transform:uppercase;letter-spacing:.1em}.quiz-name{font-weight:var(--font-weight-semibold);color:var(--color-gray-900);font-size:var(--font-size-lg)}.actions{display:flex;gap:var(--spacing-sm)}.start-btn,.edit-btn,.delete-btn,.sessions-btn{padding:var(--spacing-sm) var(--spacing-md);border:none;border-radius:8px;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 2px 8px #0000001a}.start-btn{background:linear-gradient(135deg,#48bb78,#38a169);color:#fff}.start-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 15px #48bb7866}.edit-btn{background:linear-gradient(135deg,#ed8936,#dd6b20);color:#fff}.edit-btn:hover{transform:translateY(-2px);box-shadow:0 4px 15px #ed893666}.delete-btn{background:linear-gradient(135deg,#f56565,#e53e3e);color:#fff}.delete-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 15px #f5656566}.sessions-btn{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.sessions-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 15px #667eea66}.start-btn:disabled,.delete-btn:disabled,.sessions-btn:disabled{opacity:.6;cursor:not-allowed;transform:none}.import-quiz-modal{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;padding:1rem;z-index:1000}.import-quiz-content{background:#fff;border-radius:12px;box-shadow:0 20px 25px #00000026;max-width:800px;width:100%;max-height:90vh;overflow-y:auto}.import-quiz-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem;border-bottom:1px solid #e2e8f0}.import-quiz-header h2{margin:0;color:#1a202c;font-size:1.25rem}.close-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;color:#a0aec0;padding:.25rem}.close-btn:hover{color:#4a5568}.import-form{padding:1.5rem}.import-form .form-group{margin-bottom:1.5rem}.import-form label{display:block;margin-bottom:.5rem;color:#4a5568;font-weight:500;font-size:.875rem}.import-form input,.import-form textarea{width:100%;padding:.75rem;border:2px solid #e2e8f0;border-radius:6px;font-size:.875rem;transition:border-color .2s ease}.import-form textarea{font-family:Courier New,monospace;resize:vertical}.import-form input:focus,.import-form textarea:focus{outline:none;border-color:#3182ce}.format-info{background:#f7fafc;padding:1rem;border-radius:6px;margin-bottom:1.5rem}.format-info h4{margin:0 0 .5rem;color:#4a5568;font-size:.875rem}.format-info pre{background:#edf2f7;padding:.75rem;border-radius:4px;font-size:.75rem;overflow-x:auto;margin:.5rem 0}.format-info p{margin:.5rem 0 0;color:#718096;font-size:.75rem}.form-actions{display:flex;justify-content:flex-end;gap:1rem;padding-top:1rem;border-top:1px solid #e2e8f0}.cancel-btn{padding:.5rem 1rem;background:#edf2f7;color:#4a5568;border:1px solid #e2e8f0;border-radius:6px;cursor:pointer;transition:background-color .2s ease}.cancel-btn:hover{background:#e2e8f0}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);width:100%}.login-container{text-align:center;max-width:400px;width:100%}.login-container h1{color:#fff;font-size:3rem;margin-bottom:.5rem;font-weight:700}.login-container>p{color:#ffffffe6;font-size:1.1rem;margin-bottom:2rem}.app{min-height:100vh;background-color:#f5f5f5}.quiz-loading,.quiz-error{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:20px;text-align:center}.quiz-error h2{color:#e74c3c;margin-bottom:1rem}.quiz-error p{color:#666;margin-bottom:2rem}.back-btn{background:#ffffffe6;color:#4a5568;border:1px solid rgba(255,255,255,.3);padding:.75rem 1.5rem;border-radius:8px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .3s ease;box-shadow:0 2px 8px #0000001a}.quiz-sessions{min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2)}.quiz-sessions-header{background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.2);padding:1.5rem 2rem;box-shadow:0 2px 20px #0000001a}.quiz-sessions-header .header-content{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.quiz-sessions-header .header-left h1{color:#1a202c;margin:0 0 .5rem;font-size:2rem;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.quiz-meta{display:flex;gap:1rem;margin:0}.quiz-meta-item{background:linear-gradient(135deg,#667eea1a,#764ba21a);padding:.4rem .8rem;border-radius:6px;font-size:.85rem;font-weight:600;color:#4a5568;border:1px solid rgba(102,126,234,.2)}.quiz-sessions-header .header-actions{display:flex;gap:1rem;align-items:center}.quiz-sessions-header .back-btn{color:#4a5568!important;background:#ffffffe6}.quiz-sessions-header .back-btn:hover{color:#2d3748!important;background:#fff}.create-session-btn{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:.75rem 1.5rem;border-radius:8px;cursor:pointer;font-size:.9rem;font-weight:600;transition:all .3s ease;box-shadow:0 2px 8px #0000001a}.create-session-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 15px #667eea66}.create-session-btn:disabled{opacity:.6;cursor:not-allowed;transform:none}.quiz-sessions-main{padding:2rem}.quiz-sessions-content{max-width:1200px;margin:0 auto}.sessions-count{text-align:center;margin-bottom:2rem}.sessions-count p{color:#ffffffe6;font-size:.95rem;margin:0;font-weight:500;text-shadow:0 1px 3px rgba(0,0,0,.1)}.sessions-section{background:#fffffff2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-radius:16px;padding:2rem;box-shadow:0 8px 32px #0000001a;border:1px solid rgba(255,255,255,.2)}.sessions-section h2{color:#1a202c;font-size:1.5rem;font-weight:700;margin:0 0 1.5rem;background:linear-gradient(135deg,#667eea,#764ba2);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.sessions-info{margin-bottom:1.5rem}.sessions-info 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768px){.user-management__stats{grid-template-columns:repeat(2,1fr);gap:var(--spacing-md)}.user-management__filters{grid-template-columns:1fr;gap:var(--spacing-md);padding:var(--spacing-lg)}.filter-group{min-width:auto}.filter-input,.filter-select{height:52px;font-size:var(--font-size-base)}.users-table__header,.users-table__row{grid-template-columns:1fr;gap:var(--spacing-sm);text-align:left}.users-table__header{display:none}.users-table__row{padding:var(--spacing-xl);border-bottom:1px solid rgba(255,255,255,.1);display:block;border-left:none;border-radius:var(--radius-lg);margin-bottom:var(--spacing-md);background:var(--glass-bg);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border)}.users-table__row:hover{transform:translateY(-2px);border-left:none;box-shadow:0 8px 24px 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