.login-container{background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.login-card{background:#fff;border-radius:10px;box-shadow:0 10px 40px #0003;width:100%;max-width:400px;padding:40px}.login-header{text-align:center;margin-bottom:30px}.login-header h1{font-size:28px;color:#667eea;margin-bottom:8px}.login-header p{color:#999;font-size:14px}.error-message{background:#f8d7da;color:#721c24;padding:12px;border-radius:5px;margin-bottom:20px;font-size:14px}.form-group label{display:block;margin-bottom:8px;color:#333;font-weight:500;font-size:14px}.form-group input{width:100%;padding:12px;border:1px solid #ddd;border-radius:5px;font-size:14px;transition:border-color .3s,box-shadow .3s}.login-button{width:100%;padding:12px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:5px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .2s}.login-button:hover:not(:disabled){transform:translateY(-2px)}.login-button:disabled{opacity:.7;cursor:not-allowed}.login-footer{text-align:center;margin-top:20px;font-size:14px;color:#999}.login-footer a{color:#667eea;text-decoration:none;font-weight:600}.login-footer a:hover{text-decoration:underline}.register-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);padding:20px}.register-card{background:#fff;border-radius:12px;box-shadow:0 10px 40px #0003;padding:40px;max-width:450px;width:100%}.register-header{text-align:center;margin-bottom:30px}.register-header h1{font-size:28px;color:#333;margin-bottom:8px}.register-header p{color:#666;font-size:14px}.error-message{background:#fee;color:#c33;padding:12px;border-radius:6px;margin-bottom:20px;border-left:4px solid #c33;font-size:14px}.success-message{background:#efe;color:#3c3;padding:12px;border-radius:6px;margin-bottom:20px;border-left:4px solid #3c3;font-size:14px}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:600;color:#333;font-size:14px}.form-group input{width:100%;padding:12px;border:1px solid #ddd;border-radius:6px;font-size:14px;transition:border-color .2s;box-sizing:border-box}.form-group input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.register-button{width:100%;padding:12px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:6px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s;margin-top:10px}.register-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 24px #667eea66}.register-button:disabled{opacity:.7;cursor:not-allowed}.register-footer{text-align:center;margin-top:20px;font-size:14px;color:#666}.register-footer p{margin:0}.link-btn{background:none;border:none;color:#667eea;font-weight:600;cursor:pointer;margin-left:5px;transition:color .2s}.link-btn:hover{color:#764ba2}.notification-list-page{max-width:800px;margin:0 auto;padding:20px}.notification-list-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:20px;border-bottom:2px solid #e0e0e0}.notification-list-header h1{margin:0;font-size:28px;font-weight:600;color:#333}.notification-list-actions{display:flex;gap:10px}.action-button{background:#4a90e2;color:#fff;border:none;border-radius:6px;padding:10px 16px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease}.action-button:hover{background:#357abd;transform:translateY(-1px)}.action-button.danger{background:#e74c3c}.action-button.danger:hover{background:#c0392b}.notification-list-filters{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap}.filter-button{background:#fff;color:#666;border:2px solid #e0e0e0;border-radius:20px;padding:8px 16px;font-size:13px;font-weight:500;cursor:pointer;transition:all .2s ease}.filter-button:hover{border-color:#4a90e2;color:#4a90e2}.filter-button.active{background:#4a90e2;color:#fff;border-color:#4a90e2}.notification-list-content{min-height:400px}.empty-list-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;text-align:center}.empty-list-state .empty-icon{font-size:64px;margin-bottom:16px;opacity:.5}.empty-list-state h3{margin:0 0 8px;font-size:20px;color:#333}.empty-list-state p{margin:0;color:#666;font-size:14px}.notification-list-items{display:flex;flex-direction:column;gap:12px}.notification-list-item{display:flex;gap:15px;background:#fff;border:1px solid #e0e0e0;border-left:4px solid;border-radius:8px;padding:16px;transition:all .2s ease}.notification-list-item:hover{box-shadow:0 2px 8px #0000001a;transform:translateY(-2px)}.notification-list-item.unread{background:#f8fbfd;border-left-width:4px}.notification-list-icon-wrapper{position:relative;flex-shrink:0}.notification-list-icon{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;color:#fff;font-size:18px;font-weight:700}.notification-list-unread-dot{position:absolute;top:-2px;right:-2px;width:12px;height:12px;background:#4a90e2;border-radius:50%;border:2px solid white;box-shadow:0 0 4px #4a90e24d}.notification-list-details{flex:1;min-width:0}.notification-list-header-row{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:6px}.notification-list-title{font-weight:600;font-size:16px;color:#333;flex:1}.notification-list-time{font-size:12px;color:#999;white-space:nowrap;margin-left:12px}.notification-list-message{font-size:14px;color:#555;margin:6px 0 10px;line-height:1.5}.notification-list-challenge{margin:8px 0}.notification-list-challenge .challenge-tag{display:inline-flex;align-items:center;gap:4px;background:#f0f0f0;color:#666;padding:4px 10px;border-radius:4px;font-size:12px;font-weight:500}.notification-list-actions{display:flex;gap:16px;margin-top:10px;padding-top:10px;border-top:1px solid #f0f0f0}.notification-action-link{background:none;border:none;color:#4a90e2;font-size:12px;font-weight:500;cursor:pointer;padding:4px 8px;border-radius:3px;transition:all .2s ease}.notification-action-link:hover{background:#e8f4fd;text-decoration:underline}.notification-action-link.danger{color:#e74c3c}.notification-action-link.danger:hover{background:#fdf2f2}@keyframes slide-in{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}.notification-list-item{animation:slide-in .3s ease-out}@media (max-width: 768px){.notification-list-page{padding:15px}.notification-list-header{flex-direction:column;align-items:flex-start;gap:12px}.notification-list-header h1{font-size:24px}.notification-list-actions{width:100%;flex-direction:column}.action-button{width:100%}.notification-list-filters{flex-wrap:wrap}.filter-button{flex:1;min-width:80px}.notification-list-header-row{flex-direction:column;gap:4px}.notification-list-time{margin-left:0;margin-top:4px}.notification-list-item{padding:12px}.notification-list-icon{width:36px;height:36px;font-size:14px}}.notification-system{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:1000}.notification-toast-container{position:fixed;top:80px;right:20px;z-index:1001;pointer-events:auto;display:flex;flex-direction:column;gap:10px}.notification-toast{min-width:300px;max-width:400px;background:#fff;border:1px solid #e0e0e0;border-radius:8px;box-shadow:0 4px 12px #00000026;overflow:hidden;animation:slide-in-right .3s ease-out}@keyframes slide-in-right{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}@keyframes slide-out-right{0%{opacity:1;transform:translate(0)}to{opacity:0;transform:translate(100%)}}.notification-toast.removing{animation:slide-out-right .3s ease-out forwards}.notification-toast.success{border-left:4px solid #27ae60}.notification-toast.error{border-left:4px solid #e74c3c}.notification-toast.warning{border-left:4px solid #f39c12}.notification-toast.info{border-left:4px solid #3498db}.notification-toast.challenge{border-left:4px solid #9b59b6}.notification-toast.admin{border-left:4px solid #e67e22}.notification-toast-content{padding:15px;display:flex;align-items:flex-start;gap:12px}.notification-toast-icon{flex-shrink:0;font-size:20px;line-height:1}.notification-toast-text{flex:1;min-width:0}.notification-toast-title{font-weight:600;font-size:14px;color:#333;margin:0 0 4px}.notification-toast-message{font-size:13px;color:#555;margin:0;line-height:1.4}.notification-toast-close{flex-shrink:0;background:none;border:none;color:#999;cursor:pointer;padding:4px;font-size:16px;line-height:1;transition:color .2s ease}.notification-toast-close:hover{color:#666}@media (max-width: 768px){.notification-toast-container{right:10px;left:10px;top:70px}.notification-toast{min-width:auto;max-width:none}}.notification-panel{position:relative;display:inline-block}.notification-button{position:relative;background:#f8f9fa;border:2px solid #e0e0e0;border-radius:50%;width:40px;height:40px;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:18px;transition:all .2s ease}.notification-button:hover{background:#e9ecef;border-color:#4a90e2;transform:scale(1.05)}.notification-button:active{transform:scale(.95)}.notification-icon{animation:bell-ring .3s ease-in-out}.notification-badge{position:absolute;top:-5px;right:-5px;background:#e74c3c;color:#fff;font-size:11px;font-weight:700;padding:2px 6px;border-radius:10px;min-width:18px;text-align:center;box-shadow:0 2px 4px #0003}.notification-dropdown{position:absolute;top:50px;right:0;width:400px;max-height:600px;background:#fff;border:1px solid #e0e0e0;border-radius:8px;box-shadow:0 4px 20px #00000026;z-index:1000;overflow:hidden}.notification-header{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;border-bottom:1px solid #e0e0e0;background:#f8f9fa}.notification-header h3{margin:0;font-size:16px;font-weight:600;color:#333}.notification-actions{display:flex;gap:8px}.action-button{background:none;border:1px solid #ddd;border-radius:4px;padding:4px 8px;font-size:12px;cursor:pointer;transition:all .2s ease}.action-button:hover{background:#e9ecef;border-color:#4a90e2}.notification-content{max-height:400px;overflow-y:auto}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 20px;text-align:center}.empty-icon{font-size:48px;margin-bottom:10px}.empty-state p{color:#666;font-size:14px;margin:0}.notification-list{display:flex;flex-direction:column}.notification-item{display:flex;padding:15px 20px;border-bottom:1px solid #f0f0f0;cursor:pointer;transition:background .2s ease;gap:12px}.notification-item:hover{background:#f8f9fa}.notification-item.unread{background:#e8f4fd;border-left:3px solid #4a90e2}.notification-item.success{border-left-color:#27ae60}.notification-item.error{border-left-color:#e74c3c}.notification-item.warning{border-left-color:#f39c12}.notification-item.info{border-left-color:#3498db}.notification-item.challenge{border-left-color:#9b59b6}.notification-item.admin{border-left-color:#e67e22}.notification-icon-wrapper{position:relative;flex-shrink:0}.notification-type-icon{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:#f0f0f0;border-radius:50%;font-size:16px}.unread-dot{position:absolute;top:0;right:0;width:10px;height:10px;background:#4a90e2;border-radius:50%;border:2px solid white}.notification-details{flex:1;min-width:0}.notification-header-row{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:4px}.notification-title{font-weight:600;font-size:14px;color:#333;flex:1}.notification-time{font-size:12px;color:#999;white-space:nowrap;margin-left:8px}.notification-message{font-size:13px;color:#555;margin:4px 0 8px;line-height:1.4}.notification-challenge{margin:8px 0}.challenge-tag{display:inline-block;background:#f0f0f0;color:#666;padding:2px 8px;border-radius:3px;font-size:11px;font-weight:500}.notification-action-button{background:#4a90e2;color:#fff;border:none;border-radius:4px;padding:4px 12px;font-size:12px;cursor:pointer;transition:background .2s ease}.notification-action-button:hover{background:#357abd}.notification-footer{padding:10px 15px;border-top:1px solid #e0e0e0;background:#f8f9fa}.view-all-button{width:100%;background:#fff;border:1px solid #4a90e2;color:#4a90e2;padding:8px;border-radius:4px;cursor:pointer;font-size:13px;font-weight:500;transition:all .2s ease}.view-all-button:hover{background:#4a90e2;color:#fff}.notification-overlay{position:fixed;top:0;left:0;right:0;bottom:0;z-index:999}@keyframes bell-ring{0%,to{transform:rotate(0)}25%{transform:rotate(15deg)}75%{transform:rotate(-15deg)}}@keyframes slide-in{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.notification-dropdown{animation:slide-in .2s ease-out}.notification-content::-webkit-scrollbar{width:6px}.notification-content::-webkit-scrollbar-track{background:#f1f1f1}.notification-content::-webkit-scrollbar-thumb{background:#888;border-radius:3px}.notification-content::-webkit-scrollbar-thumb:hover{background:#555}@media (max-width: 768px){.notification-dropdown{width:320px;right:-80px}.notification-header,.notification-item{padding:12px 15px}}.navbar{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:15px 30px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 10px #0000001a;position:sticky;top:0;z-index:100}.navbar-brand{font-size:20px;font-weight:700}.navbar-menu{display:flex;gap:20px;align-items:center}.nav-link{color:#fff;text-decoration:none;font-weight:500;font-size:14px;cursor:pointer;transition:opacity .2s}.nav-link:hover{opacity:.8}.navbar-right{display:flex;align-items:center;gap:15px;margin-left:auto}.navbar-username{color:#fff;font-weight:600;font-size:14px}.logout-btn{background:#fff3;color:#fff;border:1px solid rgba(255,255,255,.3);padding:8px 16px;border-radius:5px;font-size:14px;font-weight:600;cursor:pointer;transition:background .2s}.logout-btn:hover{background:#ffffff4d;border-color:#ffffff80}@media (max-width: 768px){.navbar{flex-direction:column;gap:15px}.navbar-menu{width:100%;justify-content:space-between;flex-direction:column}.navbar-right{width:100%;margin-left:0}}.stat-card{background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 8px #0000001a;text-align:center}.stat-card h3{color:#999;font-size:12px;font-weight:500;margin-bottom:10px;text-transform:uppercase}.stat-value{font-size:32px;font-weight:700;color:#667eea}.challenge-item{display:flex;justify-content:space-between;align-items:center;padding:15px;border-bottom:1px solid #f0f0f0;cursor:pointer;transition:background .2s}.challenge-item:hover{background:#f9f9f9}.challenge-item:last-child{border-bottom:none}.challenge-info{flex:1}.challenge-info.not-enrolled:hover{background:inherit}.enroll-prompt{font-size:12px;color:#ff9800;margin-top:5px;font-weight:500;font-style:italic}.challenge-title{font-weight:600;color:#333;margin-bottom:5px}.challenge-meta{font-size:12px;color:#999}.challenge-progress{font-size:12px;color:#666;margin-top:5px;font-weight:500}.challenge-status{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.btn-enroll{padding:6px 12px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:12px;font-weight:600;transition:transform .2s,box-shadow .2s}.btn-enroll:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.btn-enroll:active{transform:translateY(0)}.btn-enroll.enrolled{background:linear-gradient(135deg,#4caf50,#45a049);cursor:not-allowed}.btn-enroll:disabled{opacity:.8}.btn-enroll:disabled:hover{transform:none;box-shadow:none}@media (max-width: 768px){.challenge-item{flex-direction:column;align-items:flex-start}.challenge-status{margin-top:10px}}.dashboard{min-height:100vh;background:#f5f7fa}.dashboard-header{margin-bottom:30px}.dashboard-header h1{font-size:28px;color:#333;margin-bottom:5px}.dashboard-header p{color:#999;font-size:14px}.error-message{background:#f8d7da;color:#721c24;padding:12px 20px;border-radius:5px;margin-bottom:20px;font-size:14px}.loading{display:flex;justify-content:center;align-items:center;min-height:100vh;font-size:18px;color:#999}.challenges-section{background:#fff;border-radius:8px;box-shadow:0 2px 8px #0000001a;overflow:hidden}.challenges-list{padding:20px}@media (max-width: 768px){.stats-grid{grid-template-columns:repeat(2,1fr)}.dashboard-header h1{font-size:24px}}.admin-layout{display:flex;min-height:calc(100vh - 60px);background:#f5f5f5}.admin-sidebar{width:250px;background:linear-gradient(180deg,#667eea,#764ba2);padding:20px;box-shadow:0 2px 8px #0000001a;overflow-y:auto}.sidebar-header{color:#fff;font-size:16px;font-weight:700;margin-bottom:30px;text-align:center}.sidebar-menu{display:flex;flex-direction:column;gap:10px}.sidebar-item{padding:12px 16px;background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#ffffffe6;border-radius:6px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s;text-align:left}.sidebar-item:hover{background:#fff3;color:#fff}.sidebar-item.active{background:#fff;color:#667eea;border-color:#fff;box-shadow:0 2px 8px #00000026}.admin-main{flex:1;overflow-y:auto;padding:30px}@media (max-width: 768px){.admin-layout{flex-direction:column}.admin-sidebar{width:100%}.sidebar-menu{flex-direction:row;gap:5px}.sidebar-item{padding:10px 12px;font-size:12px}.admin-main{padding:20px}}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-bottom:30px}.stat-card{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:25px;border-radius:8px;text-align:center;box-shadow:0 4px 12px #667eea33;transition:transform .2s}.stat-card:hover{transform:translateY(-2px);box-shadow:0 6px 16px #667eea4d}.stat-value{font-size:32px;font-weight:700;margin-bottom:8px}.stat-label{font-size:14px;opacity:.9}.leaderboard-section{margin-top:30px}.leaderboard-section h3{font-size:16px;font-weight:700;color:#333;margin-bottom:15px}.leaderboard-table{width:100%;border-collapse:collapse;background:#fff;border-radius:6px;overflow:hidden}.leaderboard-table thead{background:#f5f5f5}.leaderboard-table th{padding:12px;text-align:left;font-weight:600;color:#333;border-bottom:2px solid #e0e0e0}.leaderboard-table td{padding:12px;border-bottom:1px solid #e0e0e0}.leaderboard-table tbody tr{transition:background .2s}.leaderboard-table tbody tr.clickable-row{cursor:pointer}.leaderboard-table tbody tr.clickable-row:hover{background:#f9f9f9}.rank-badge{display:inline-block;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:4px 12px;border-radius:12px;font-size:12px;font-weight:600}.admin-page{min-height:100vh;background:#f5f5f5}.admin-content{max-width:1400px;margin:0 auto;padding:30px 20px}.data-table{width:100%;border-collapse:collapse;background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 1px 4px #0000000d}.role-badge{display:inline-block;padding:4px 12px;border-radius:20px;font-size:12px;font-weight:600;text-transform:uppercase}.role-admin{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.role-user{background:#e3f2fd;color:#1976d2}.btn-save,.btn-cancel,.btn-edit,.btn-delete{padding:6px 12px;margin-right:5px;border:none;border-radius:4px;font-size:12px;font-weight:600;cursor:pointer;transition:all .2s}.btn-save{background:#4caf50;color:#fff}.btn-save:hover{background:#45a049}.btn-cancel{background:#f44336;color:#fff}.btn-cancel:hover{background:#da190b}.section-header{font-size:18px;font-weight:700;color:#333;margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid #667eea;display:flex;justify-content:space-between;align-items:center}.btn-create{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:10px 20px;border-radius:6px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s}.btn-create:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea4d}.search-input{width:100%;max-width:400px;padding:10px;margin-bottom:20px;border:1px solid #ddd;border-radius:6px;font-size:14px}.desc-cell{max-width:300px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#666;font-size:13px}.type-badge,.difficulty-badge{display:inline-block;padding:4px 12px;border-radius:4px;font-size:12px;font-weight:600;text-transform:uppercase}.type-fe{background:#e3f2fd;color:#1976d2}.type-be{background:#f3e5f5;color:#7b1fa2}.type-api{background:#e0f2f1;color:#00796b}.difficulty-easy{background:#e8f5e9;color:#2e7d32}.difficulty-medium{background:#fff3e0;color:#e65100}.difficulty-hard{background:#ffebee;color:#c62828}.btn-edit,.btn-delete{padding:6px 12px;margin-right:5px;border:none;border-radius:4px;font-size:12px;font-weight:600;cursor:pointer;transition:all .2s}.btn-edit{background:#2196f3;color:#fff}.btn-edit:hover{background:#0b7dda}.btn-delete{background:#ff9800;color:#fff}.btn-delete:hover{background:#e68900}.empty-state{text-align:center;padding:40px;color:#999;font-size:14px}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0000004d;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background:#fff;border-radius:8px;padding:2rem;max-width:680px;width:100%;max-height:90vh;overflow-y:auto;border:1px solid #e0e0e0;box-shadow:0 10px 30px #00000026;position:relative}.modal-loading-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#fffffff2;border-radius:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:10}.modal-loading-spinner{width:48px;height:48px;border:4px solid #e0e0e0;border-top-color:#667eea;border-radius:50%;animation:spin .8s linear infinite;margin-bottom:20px}@keyframes spin{to{transform:rotate(360deg)}}.modal-loading-text{font-size:18px;font-weight:600;color:#333;margin:0 0 8px}.modal-loading-subtext{font-size:14px;color:#888;margin:0}.modal-close:disabled,.btn-cancel:disabled{opacity:.3;cursor:not-allowed}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;padding-bottom:1rem;border-bottom:2px solid #667eea}.modal-header h3{margin:0;font-size:1.5rem;color:#333}.modal-close{background:transparent;border:none;color:#999;font-size:1.5rem;cursor:pointer;padding:.5rem;width:2.5rem;height:2.5rem;display:flex;align-items:center;justify-content:center;border-radius:.5rem;transition:all .3s ease}.form-field{margin-bottom:20px}.form-field label{display:block;font-weight:600;color:#333;margin-bottom:8px;font-size:14px}.form-field input,.form-field textarea,.form-field select{width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;font-size:14px;font-family:inherit}.form-field input:focus,.form-field textarea:focus,.form-field select:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.form-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:15px}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}.btn-submit,.btn-cancel{padding:10px 20px;border:none;border-radius:6px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s}.btn-submit{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.btn-submit:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea4d}.btn-cancel{background:#e0e0e0;color:#333}.btn-cancel:hover{background:#d0d0d0}.scenarios-section{margin-bottom:20px}.scenarios-section label{display:block;font-weight:600;color:#333;margin-bottom:10px;font-size:14px}.scenario-input-group input{width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;font-size:14px}.scenario-input-group input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.injection-type-select{flex:1;padding:10px;border:1px solid #ddd;border-radius:6px;font-size:14px;background:#fff;cursor:pointer}.injection-type-select:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.btn-remove-scenario{background:#ff9800;color:#fff;border:none;padding:8px 12px;border-radius:4px;cursor:pointer;font-weight:600;transition:all .2s}.btn-add-scenario{background:#e0e0e0;color:#333;border:none;padding:8px 16px;border-radius:4px;cursor:pointer;font-size:12px;font-weight:600;transition:all .2s}.btn-add-scenario:hover{background:#d0d0d0}.app-type-options{display:flex;gap:20px;margin-top:8px;padding:12px;background:#f8f9fa;border-radius:6px;border:1px solid #e9ecef}.existing-app-dropdowns{margin-bottom:20px;padding:16px;background:#f8f9fa;border-radius:6px;border:1px solid #e9ecef;animation:slideDown .2s ease}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.form-row.two-cols{grid-template-columns:1fr 1fr;gap:15px}.scenario-input-group{display:flex;flex-direction:column;gap:8px;margin-bottom:16px;padding:14px;background:#f8f9fa;border-radius:6px;border:1px solid #e9ecef;position:relative}.scenario-name-input input{width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;font-size:14px;font-family:inherit}.scenario-name-input input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.scenario-description-input textarea{width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;font-size:14px;font-family:inherit;resize:vertical;min-height:60px}.scenario-description-input textarea:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.scenario-input-group .btn-remove-scenario{position:absolute;top:10px;right:10px;background:#fee;color:#c62828;border:1px solid #fcc;width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;padding:0;font-size:14px;line-height:1}.scenario-input-group .btn-remove-scenario:hover{background:#c62828;color:#fff;border-color:#c62828}.scenario-note{display:block;font-size:12px;font-weight:400;color:#888;margin-top:4px}.form-field select:disabled{background:#f0f0f0;color:#aaa;cursor:not-allowed}.scenario-input-group input:disabled,.scenario-input-group textarea:disabled{background:#f0f0f0;color:#666;cursor:not-allowed}.scenario-input-group:has(input:disabled){background:#f5f5f5;border-color:#e0e0e0}.challenges-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-top:20px}.challenge-card{background:#fff;border-radius:8px;padding:20px;border:1px solid #e0e0e0;box-shadow:0 2px 4px #0000001a;transition:all .2s}.challenge-card:hover{box-shadow:0 4px 12px #00000026;transform:translateY(-2px)}.challenge-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.challenge-header h3{margin:0;font-size:16px;color:#333}.badge{display:inline-block;padding:4px 8px;border-radius:4px;font-size:12px;font-weight:600;text-transform:uppercase}.badge-frontend,.badge-fe{background:#e3f2fd;color:#1976d2}.badge-backend,.badge-be{background:#f3e5f5;color:#7b1fa2}.challenge-description{color:#666;font-size:14px;margin-bottom:15px;min-height:40px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.challenge-meta{display:flex;flex-direction:column;gap:8px;margin-bottom:15px;font-size:13px;color:#555}.meta-item{display:flex;justify-content:space-between}.challenge-actions{display:flex;gap:10px;border-top:1px solid #eee;padding-top:15px}.btn-edit,.btn-delete{flex:1;padding:8px 16px;border:none;border-radius:4px;font-size:13px;font-weight:600;cursor:pointer;transition:all .2s}.btn-edit{background:#f5f5f5;color:#333;border:1px solid #ddd}.btn-edit:hover{background:#e8e8e8}.btn-delete{background:#fff5f5;color:#dc3545;border:1px solid #fed7d7}.btn-delete:hover{background:#ffe5e5;background:linear-gradient(135deg,#ffe5e5,#ffd5d5)}.loading,.error,.no-data{text-align:center;padding:40px;color:#666;font-size:16px}.error{color:#dc3545}.be-endpoint-section{margin-bottom:20px}.be-section-hint{font-size:12px;color:#888;margin:4px 0 8px}.be-endpoint-preview{margin-top:12px;padding:16px;background:#f8f9fa;border:1px solid #e9ecef;border-radius:6px}.endpoint-badge{display:flex;align-items:center;gap:8px;margin-bottom:8px}.method-badge{padding:4px 10px;border-radius:4px;font-size:12px;font-weight:700;text-transform:uppercase}.method-get{background:#61affe;color:#fff}.method-post{background:#49cc90;color:#fff}.method-put{background:#fca130;color:#fff}.method-delete{background:#f93e3e;color:#fff}.method-patch{background:#50e3c2;color:#fff}.endpoint-path{font-family:monospace;font-size:14px;color:#333;font-weight:600}.endpoint-summary{font-size:13px;color:#666;margin:0 0 12px}.endpoint-response-info{margin-bottom:8px;font-size:13px}.endpoint-response-info .response-label{display:inline-block;margin-right:6px;font-weight:600}.endpoint-response-info code{background:#e9ecef;padding:2px 6px;border-radius:3px;font-size:12px;color:#333}.scenarios-section{margin-top:20px;border-top:2px solid #e0e0e0;padding-top:20px}.scenarios-section label{font-weight:600;margin-bottom:15px;display:block;color:#333}.scenario-note{font-weight:400;font-size:12px;color:#666;margin-left:8px}.scenario-input-group{display:flex;flex-direction:column;gap:10px;margin-bottom:15px;padding:15px;background:#f9f9f9;border-radius:6px;border:1px solid #e0e0e0;position:relative}.scenario-name-input input,.scenario-description-input textarea{width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;font-size:14px;background:#fff;transition:all .2s}.scenario-name-input input:focus,.scenario-description-input textarea:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.scenario-description-input textarea{min-height:80px;resize:vertical}.scenario-description-input textarea::placeholder{color:#999;font-style:italic}.btn-remove-scenario{background:#ff9800;color:#fff;border:none;padding:8px 12px;border-radius:4px;cursor:pointer;font-weight:600;transition:all .2s;align-self:flex-start}.btn-remove-scenario:hover{background:#e68900}.btn-add-scenario{background:#667eea;color:#fff;border:none;padding:10px 16px;border-radius:6px;cursor:pointer;font-size:12px;font-weight:600;transition:all .2s}.btn-add-scenario:hover{background:#5568d3;transform:translateY(-1px)}.app-type-options{display:flex;gap:20px;margin-top:8px}.app-option{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:14px;font-weight:500;color:#333}.app-option input[type=radio]{width:auto;margin:0;cursor:pointer}.app-option:hover{color:#667eea}.admin-injection-types{padding:2rem;max-width:1400px;margin:0 auto}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.page-header h1{margin:0;font-size:2rem;color:#fff}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:.75rem 1.5rem;border-radius:.5rem;cursor:pointer;font-size:1rem;font-weight:600;transition:all .3s ease}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 20px #667eea4d}.btn-secondary{background:#2d3748;color:#fff;border:none;padding:.75rem 1.5rem;border-radius:.5rem;cursor:pointer;font-size:1rem;transition:all .3s ease}.btn-secondary:hover{background:#4a5568}.btn-edit{background:#3182ce;color:#fff;border:none;padding:.5rem 1rem;border-radius:.375rem;cursor:pointer;font-size:.875rem;transition:all .3s ease}.btn-edit:hover{background:#2b6cb0}.btn-delete{background:#e53e3e;color:#fff;border:none;padding:.5rem 1rem;border-radius:.375rem;cursor:pointer;font-size:.875rem;transition:all .3s ease}.btn-delete:hover{background:#c53030}.loading{text-align:center;padding:2rem;color:#a0aec0;font-size:1.25rem}.error-banner{background:#e53e3e1a;border:1px solid #e53e3e;color:#fc8181;padding:1rem;border-radius:.5rem;margin-bottom:1rem}.filters-section{display:flex;gap:1rem;align-items:center;background:linear-gradient(135deg,#1e293b,#334155);padding:1.5rem;border-radius:1rem;margin-bottom:2rem;border:1px solid rgba(255,255,255,.1);flex-wrap:wrap}.search-box{flex:2;min-width:300px}.search-input{width:100%;padding:.75rem 1rem;border:1px solid rgba(255,255,255,.1);border-radius:.5rem;background:#0000004d;color:#fff;font-size:.95rem;transition:all .3s ease}.filter-box{display:flex;align-items:center;gap:.75rem;flex:1;min-width:200px}.filter-box label{color:#e2e8f0;font-weight:500;font-size:.9rem;white-space:nowrap}.filter-select{padding:.75rem 1rem;border:1px solid rgba(255,255,255,.1);border-radius:.5rem;background:#0000004d;color:#fff;font-size:.95rem;transition:all .3s ease;min-width:150px;flex:1}.filter-select:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.stats-box{display:flex;align-items:center;gap:.5rem;padding:.75rem 1rem;background:#667eea1a;border-radius:.5rem;border:1px solid rgba(102,126,234,.3);flex-shrink:0}.stat-label{color:#a0aec0;font-size:.875rem}.stat-value{color:#667eea;font-weight:600;font-size:1rem}.table-container{background:linear-gradient(135deg,#1e293b,#334155);border-radius:1rem;overflow-x:auto;border:1px solid rgba(255,255,255,.1)}.injection-types-table{width:100%;border-collapse:collapse;min-width:900px}.injection-types-table thead{background:#0000004d}.injection-types-table th{padding:1rem;text-align:left;color:#e2e8f0;font-weight:600;font-size:.875rem;text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid rgba(255,255,255,.1)}.injection-types-table td{padding:1rem;color:#cbd5e0;font-size:.95rem;border-bottom:1px solid rgba(255,255,255,.05)}.injection-types-table tr:last-child td{border-bottom:none}.injection-types-table tbody tr:hover{background:#667eea0d}.no-results{text-align:center;color:#a0aec0;padding:2rem;font-style:italic}.name-cell{min-width:200px}.name-cell strong{color:#fff;font-weight:600}.description-cell{max-width:300px;word-wrap:break-word}.app-type-cell{min-width:120px}.app-type-badge{padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.badge-frontend{background:#4299e133;color:#63b3ed;border:1px solid #4299e1}.badge-backend{background:#ed64a633;color:#ed64a6;border:1px solid #d53f8c}.badge-both{background:#ed893633;color:#f6ad55;border:1px solid #dd6b20}.params-cell{max-width:250px;min-width:150px}.params-code{display:block;background:#0000004d;padding:.5rem .75rem;border-radius:.375rem;font-size:.8rem;color:#e2e8f0;overflow-x:auto;white-space:nowrap;word-break:break-all}.no-params{color:#718096;font-style:italic;font-size:.875rem}.date-cell{min-width:120px;color:#718096;font-size:.875rem}.actions-cell{min-width:200px}.table-actions{display:flex;gap:.5rem}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0000004d;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem}.modal-content{background:#fff;border-radius:1rem;padding:2rem;max-width:600px;width:100%;max-height:90vh;overflow-y:auto;border:1px solid #e0e0e0;box-shadow:0 10px 30px #00000026}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.modal-header h2{margin:0;font-size:1.5rem;color:#333}.modal-close{background:transparent;border:none;color:#999;font-size:2rem;cursor:pointer;line-height:1;padding:0;width:2rem;height:2rem;display:flex;align-items:center;justify-content:center;border-radius:.5rem;transition:all .3s ease}.modal-close:hover{background:#ef44441a;color:#ef4444}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;color:#333;font-weight:500;font-size:.9rem}.form-group input,.form-group textarea,.form-group select{width:100%;padding:.75rem;border:1px solid #ddd;border-radius:.5rem;background:#fff;color:#333;font-size:.95rem;transition:all .3s ease;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif}.form-group input:focus,.form-group textarea:focus,.form-group select:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.form-group textarea{resize:vertical;min-height:100px;font-family:Monaco,Menlo,Ubuntu Mono,monospace}.form-group small{display:block;margin-top:.5rem;color:#666;font-size:.8rem}.error-message{background:#ef44441a;border:1px solid #ef4444;color:#dc2626;padding:.75rem;border-radius:.5rem;margin-bottom:1rem;font-size:.9rem}.modal-actions{display:flex;justify-content:flex-end;gap:1rem;margin-top:2rem;padding-top:1.5rem;border-top:1px solid #e0e0e0}.admin-section{background:#fff;border-radius:8px;padding:20px;box-shadow:0 2px 8px #0000001a}.section-header{font-size:18px;font-weight:700;color:#333;margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid #667eea}.data-table{width:100%;border-collapse:collapse;background:#fff;border-radius:6px;overflow:hidden;box-shadow:0 1px 4px #0000000d}.data-table thead{background:#f9f9f9}.data-table th{padding:15px;text-align:left;font-weight:600;color:#333;border-bottom:2px solid #e0e0e0}.data-table td{padding:15px;border-bottom:1px solid #e0e0e0}.data-table tbody tr:hover{background:#f9f9f9}.status-badge{display:inline-block;padding:4px 12px;border-radius:4px;font-size:12px;font-weight:600;text-transform:uppercase}.status-correct{background:#e8f5e9;color:#2e7d32}.status-incorrect{background:#ffebee;color:#c62828}.status-pending{background:#e3f2fd;color:#1976d2}.error-message{background:#ffebee;color:#c62828;padding:12px;border-radius:6px;margin-bottom:20px;border-left:4px solid #c62828}.empty-state{text-align:center;padding:40px;color:#999;font-style:italic}.id-cell{font-family:monospace;font-size:12px;max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.search-input{width:100%;padding:10px;margin-bottom:20px;border:1px solid #ddd;border-radius:4px;font-size:14px}.search-input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.btn-view{padding:6px 12px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:12px;font-weight:600;transition:transform .2s,box-shadow .2s}.btn-view:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.detail-section{background:#f9f9f9;padding:20px;border-radius:6px;margin-bottom:20px}.detail-row{display:flex;align-items:center;padding:10px 0;border-bottom:1px solid #eee;gap:15px}.detail-row:last-child{border-bottom:none}.detail-label{font-weight:600;color:#333;min-width:120px}.detail-value{color:#666;flex:1;word-break:break-all}.detail-id{font-family:monospace;font-size:12px;color:#999}.btn-close{padding:8px 20px;background:#999;color:#fff;border:none;border-radius:4px;cursor:pointer;font-weight:600}.btn-close:hover{background:#777}.scenarios-table-section{margin-top:20px}.scenarios-table-section h4{color:#333;margin-bottom:15px;font-size:14px;font-weight:600}.scenarios-detail-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid #ddd;border-radius:4px;overflow:hidden}.scenarios-detail-table thead{background:#f5f5f5}.scenarios-detail-table th{padding:12px;text-align:left;font-weight:600;color:#333;border-bottom:1px solid #ddd;font-size:12px}.scenarios-detail-table td{padding:12px;border-bottom:1px solid #eee;font-size:12px}.scenarios-detail-table tr:last-child td{border-bottom:none}.flag-cell{font-family:monospace;color:#666;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.status-success{background:#4caf50}.status-failed{background:#f44336}.loading{text-align:center;padding:40px;color:#666}.user-profile{min-height:100vh;background:#f5f7fa;padding:30px 20px;max-width:1000px;margin:0 auto}.back-btn{background:none;border:none;color:#667eea;font-size:14px;cursor:pointer;margin-bottom:25px;font-weight:600;transition:color .2s}.back-btn:hover{color:#764ba2}.profile-header{background:#fff;border-radius:8px;padding:30px;display:flex;align-items:center;gap:30px;box-shadow:0 2px 8px #0000001a;margin-bottom:25px}.profile-avatar{width:100px;height:100px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;display:flex;align-items:center;justify-content:center;font-size:48px;font-weight:600;flex-shrink:0}.profile-info{flex:1}.profile-info h1{margin:0 0 8px;color:#333;font-size:28px}.profile-info .email{margin:0 0 15px;color:#999;font-size:14px}.profile-meta{display:flex;gap:25px;font-size:13px;color:#666}.profile-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:15px;margin-bottom:30px}.stat-card{background:linear-gradient(135deg,#667eea,#764ba2);padding:20px;border-radius:8px;text-align:center;box-shadow:0 2px 8px #0000001a;color:#fff}.stat-value{font-size:28px;font-weight:600;color:#fff;margin-bottom:8px}.stat-label{font-size:12px;color:#fff;font-weight:500;opacity:.95}.submission-history{background:#fff;border-radius:8px;padding:30px;box-shadow:0 2px 8px #0000001a}.submission-history h2{margin:0 0 20px;color:#333;font-size:20px}.submission-history table{width:100%;border-collapse:collapse}.submission-history table thead{background:#f9f9f9;border-bottom:2px solid #ddd}.submission-history table th{padding:12px;text-align:left;font-weight:600;color:#333;font-size:13px}.submission-history table td{padding:12px;border-bottom:1px solid #f0f0f0;color:#666;font-size:13px}.submission-history table tbody tr:hover{background:#f9f9f9}.status-badge{display:inline-block;padding:4px 8px;border-radius:3px;font-size:11px;font-weight:600}.status-badge.correct{background:#d4edda;color:#155724}.status-badge.incorrect{background:#f8d7da;color:#721c24}@media (max-width: 768px){.user-profile{padding:15px}.profile-header{flex-direction:column;text-align:center;padding:20px}.profile-meta{justify-content:center;flex-wrap:wrap}.profile-stats{grid-template-columns:repeat(2,1fr)}.submission-history table{font-size:12px}.submission-history table th,.submission-history table td{padding:8px}}.challenge-detail{min-height:100vh;background:#f5f7fa}.back-button{background:none;border:none;color:#667eea;font-size:14px;cursor:pointer;margin-bottom:20px;font-weight:600;transition:color .2s}.back-button:hover{color:#764ba2}.challenge-header{background:#fff;padding:30px;border-radius:8px;margin-bottom:20px;box-shadow:0 2px 8px #0000001a}.challenge-header h1{font-size:28px;color:#333;margin-bottom:15px}.challenge-meta{display:flex;gap:15px;align-items:center;font-size:14px}.challenge-meta .status{color:#999}.content-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:20px}.card{background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 8px #0000001a}.card-title{font-size:16px;font-weight:600;color:#333;margin-bottom:15px;padding-bottom:10px;border-bottom:2px solid #667eea}.card-content{color:#666;font-size:14px;line-height:1.6}.card-content p{margin-bottom:10px}.card-content ul{margin-left:20px;margin-top:10px}.card-content li{margin-bottom:8px}.open-app-btn{width:100%;margin-top:15px;padding:10px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:5px;font-weight:600;cursor:pointer;font-size:14px;transition:transform .2s}.open-app-btn:hover{transform:translateY(-2px)}.scenarios-list{display:flex;flex-direction:column;gap:0}.scenario-item.completed-scenario{opacity:.5;background:#f0f0f0;pointer-events:none}.scenario-item.completed-scenario .scenario-name{text-decoration:line-through;color:#999}.scenario-item{cursor:pointer;transition:background .2s;background:#fff;display:flex;justify-content:space-between;align-items:center;padding:15px;border-bottom:1px solid #f0f0f0}.scenario-item:hover{background:#f9f9f9}.scenario-item.active{background:#e7f3ff;border-left:4px solid #667eea;padding-left:11px}.scenario-item.completed{opacity:.7}.scenario-left{display:flex;gap:15px;align-items:flex-start;flex:1}.scenario-number{background:#667eea;color:#fff;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:12px;flex-shrink:0}.scenario-info{flex:1}.scenario-name{font-weight:600;color:#333;margin-bottom:5px}.scenario-desc{font-size:12px;color:#999}.scenario-status{display:flex;align-items:center;margin-left:15px}.status-badge{width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px}.status-badge.completed{background:#d4edda;color:#155724}.status-badge.pending{background:#f0f0f0;color:#999}.simulation-section{background:#fff;padding:30px;border-radius:8px;box-shadow:0 2px 8px #0000001a;margin-bottom:20px}.sim-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:20px}.sim-title{font-size:20px;color:#333;margin:0;flex:1}.sim-buttons{display:flex;gap:10px}.test-btn,.simulate-btn,.reset-btn-header{padding:10px 20px;border:none;border-radius:5px;font-weight:600;cursor:pointer;transition:all .3s;font-size:13px}.test-btn{background:#06b6d4;color:#fff}.test-btn:hover:not(:disabled){background:#0891b2}.test-btn:disabled{opacity:.6;cursor:not-allowed}.simulate-btn{background:#a855f7;color:#fff}.simulate-btn:hover:not(:disabled){background:#9333ea}.reset-btn-header{background:#6b7280;color:#fff}.reset-btn-header:hover:not(:disabled){background:#4b5563}.reset-btn-header:disabled{opacity:.4;cursor:not-allowed}.sim-info{color:#666;font-size:14px;margin-bottom:20px}.simulate-btn{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:10px 20px;border-radius:5px;font-weight:600;cursor:pointer;font-size:14px;transition:transform .2s;display:flex;align-items:center;gap:8px}.simulate-btn:hover:not(:disabled){transform:translateY(-2px)}.simulate-btn:disabled{opacity:.6;cursor:not-allowed}.loading-spinner{margin-top:20px;width:40px;height:40px;border:4px solid #f0f0f0;border-top:4px solid #667eea;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.simulate-success{margin-top:20px;padding:15px;background:#d4edda;color:#155724;border:1px solid #c3e6cb;border-radius:5px;font-weight:500;font-size:14px}.test-success{margin-top:20px;padding:15px;background:#d1ecf1;color:#0c5460;border:1px solid #bee5eb;border-radius:5px;font-weight:500;font-size:14px}.test-success p{margin:8px 0}.session-url{margin:12px 0;padding:10px;background:#fff9;border-radius:3px}.session-url code{font-family:monospace;font-size:12px;color:#0c5460;word-break:break-all}.open-session-btn{background:#17a2b8;color:#fff;border:none;padding:8px 16px;border-radius:4px;cursor:pointer;font-weight:600;font-size:13px;margin-top:10px}.open-session-btn:hover{background:#138496}.reset-btn{background:#6b7280;color:#fff;padding:8px 16px;border:none;border-radius:4px;cursor:pointer;font-weight:600;font-size:13px}.reset-btn:hover{background:#4b5563}.session-actions{display:flex;gap:10px;margin-top:15px}.submission-section{background:#fff;padding:30px;border-radius:8px;box-shadow:0 2px 8px #0000001a}.submit-info{color:#666;font-size:14px;margin-bottom:20px}.flag-input-wrapper{position:relative;margin-bottom:15px}.flag-input{width:100%;padding:12px;border:2px solid #ddd;border-radius:5px;font-size:14px;font-family:Courier New,monospace;transition:border-color .3s;background:#fff}.flag-input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.flag-input:disabled{background:#f5f5f5;color:#999;cursor:not-allowed}.flag-copied{position:absolute;right:12px;top:50%;transform:translateY(-50%);color:#28a745;font-weight:600}.submit-btn{width:100%;padding:12px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:5px;font-weight:600;cursor:pointer;transition:transform .2s;font-size:16px}.submit-btn:hover:not(:disabled){transform:translateY(-2px)}.submit-btn:disabled{opacity:.5;cursor:not-allowed}.feedback{margin-top:15px;padding:12px 15px;border-radius:5px;font-size:14px;font-weight:600}.feedback.success{background:#d4edda;color:#155724;border:1px solid #c3e6cb}.feedback.error{background:#f8d7da;color:#721c24;border:1px solid #f5c6cb}.popup-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.popup{background:#fff;border-radius:10px;box-shadow:0 10px 40px #0003;max-width:500px;width:90%;padding:0;overflow:hidden}.popup-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:20px;font-size:18px;font-weight:600}.popup-content{padding:20px}.popup-content p{color:#666;font-size:14px;margin-bottom:15px}.flag-display{background:#f5f5f5;border:2px dashed #667eea;padding:15px;border-radius:5px;font-family:Courier New,monospace;font-weight:600;color:#333;word-break:break-all;margin-bottom:15px;-webkit-user-select:all;user-select:all}.popup-instructions{color:#999;font-size:12px!important;font-style:italic}.popup-close-btn{display:block;width:100%;padding:12px;background:#667eea;color:#fff;border:none;font-weight:600;cursor:pointer;transition:background .2s}.popup-close-btn:hover{background:#764ba2}@media (max-width: 768px){.content-grid{grid-template-columns:1fr}.challenge-header h1{font-size:24px}.challenge-meta{flex-wrap:wrap}.popup{width:95%}}.screenshot-input-wrapper{margin-bottom:20px;display:flex;flex-direction:column;gap:12px}.screenshot-label{font-weight:600;color:#333;font-size:14px}.screenshot-input{padding:12px;border:2px dashed #667eea;border-radius:6px;background:#f9fafb;cursor:pointer;font-size:14px;transition:all .2s}.screenshot-input:hover:not(:disabled){border-color:#764ba2;background:#f0f0ff}.screenshot-input:disabled{opacity:.6;cursor:not-allowed}.filename{font-size:13px;color:#667eea;font-weight:500}.api-docs-card{grid-column:1 / -1}.api-docs-inline{margin-top:8px}.fe-app-section{margin-top:16px;padding:16px;background:#f8f9fa;border:1px solid #e9ecef;border-radius:8px}.fe-app-info{margin-bottom:12px}.fe-info-row{display:flex;align-items:center;gap:8px;margin-bottom:8px;font-size:14px}.fe-info-label{font-weight:600;color:#555;min-width:100px}.fe-info-value{font-family:monospace;font-size:13px;color:#333;word-break:break-all}.fe-app-buttons{display:flex;gap:10px;flex-wrap:wrap}.fe-app-buttons .open-session-btn,.fe-app-buttons .reset-injection-btn{flex:1;min-width:140px}.fe-app-guide{margin:16px 0;padding:16px;background:#f8f9fa;border:1px solid #e9ecef;border-radius:8px}.fe-app-guide .fe-app-info{margin-bottom:12px}.fe-app-guide .reset-injection-btn{margin-top:0}.fe-app-guide-card{background:#f8f9fa;border:1px solid #e9ecef;border-radius:8px;padding:16px;margin-bottom:16px}.fe-app-guide-card .card-title{margin:0 0 12px;font-size:18px;color:#333}.fe-app-guide-card .fe-app-info{margin-bottom:12px}.fe-app-guide-card .fe-info-row{display:flex;align-items:center;gap:8px;margin-bottom:8px;font-size:14px}.fe-app-guide-card .fe-info-label{font-weight:600;color:#555;min-width:100px}.fe-app-guide-card .fe-info-value{font-family:monospace;font-size:13px;color:#333;word-break:break-all}.fe-app-guide-card .reset-injection-btn{margin-top:0}.fe-app-guide-card .open-session-btn{margin-top:8px;width:100%}.fe-app-guide-card .reset-injection-btn{margin-top:0;width:100%;margin-bottom:8px}.simulate-success{margin-top:12px;padding:16px;background:#f8f9fa;border:1px solid #e9ecef;border-radius:8px}.simulate-success p{margin:0 0 8px}.simulate-success p:last-child{margin-bottom:0}.automation-hint{font-size:13px;color:#666;margin:8px 0 0}.automation-url{font-family:monospace;font-size:12px;color:#333;word-break:break-all;display:block;margin-top:4px}.api-docs{background:#f8f9fa;border:1px solid #e9ecef;border-radius:8px;padding:20px;margin-bottom:20px}.api-docs-header h3{margin:0 0 16px;font-size:18px;color:#333}.api-endpoint-info{margin-bottom:20px}.endpoint-badge-large{display:flex;align-items:center;gap:10px;margin-bottom:8px}.endpoint-path-large{font-family:monospace;font-size:18px;font-weight:700;color:#333}.endpoint-summary-large{font-size:15px;color:#555;margin:0 0 4px;font-weight:500}.endpoint-description{font-size:13px;color:#888;margin:0}.api-section{margin-bottom:16px;padding:12px;background:#fff;border-radius:6px;border:1px solid #e9ecef}.api-section-title{font-size:14px;font-weight:600;margin-bottom:8px}.api-success{color:#28a745}.api-error{color:#dc3545}.api-warning{color:#ffc107}.api-response-info{display:flex;align-items:flex-start;gap:10px}.api-status{padding:2px 8px;border-radius:4px;font-size:13px;font-weight:600;white-space:nowrap}.api-status-success{background:#d4edda;color:#155724}.api-status-error{background:#f8d7da;color:#721c24}.api-code-block{background:#f1f3f5;padding:10px;border-radius:4px;font-size:13px;font-family:monospace;overflow-x:auto;margin:0;flex:1}.api-injected-section{border-color:#ffeaa7;background:#fffdf0}.api-injected-hint{font-size:13px;color:#856404;margin:0 0 10px}.api-flag-location{display:flex;align-items:center;gap:6px;padding:8px;background:#fff3cd;border-radius:4px;font-size:13px}.flag-icon{font-size:16px}.flag-label{font-weight:600;color:#856404}.flag-value{font-family:monospace;background:#ffeaa7;padding:2px 6px;border-radius:3px;color:#333}.http-client{background:#f8f9fa;border:1px solid #e9ecef;border-radius:8px;padding:20px;margin-bottom:20px}.http-client-header h3{margin:0 0 16px;font-size:18px;color:#333}.http-request-line{display:flex;gap:10px;margin-bottom:12px}.http-method-select{padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-weight:600;font-size:13px;width:100px}.http-path-input{flex:1;padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-family:monospace;font-size:13px}.http-send-btn{padding:8px 20px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:4px;font-weight:600;cursor:pointer;white-space:nowrap;transition:all .2s}.http-send-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 2px 8px #667eea4d}.http-send-btn:disabled{opacity:.5;cursor:not-allowed}.http-body-section{margin-bottom:12px}.http-body-label{display:block;font-size:13px;font-weight:600;margin-bottom:4px;color:#555}.http-body-input{width:100%;padding:10px;border:1px solid #ddd;border-radius:4px;font-family:monospace;font-size:13px;resize:vertical}.http-hint{font-size:13px;color:#856404;padding:8px;background:#fff3cd;border-radius:4px}.http-response{margin-top:16px;border-top:1px solid #e9ecef;padding-top:16px}.http-response-header{margin-bottom:8px}.http-response-status{padding:4px 10px;border-radius:4px;font-weight:600;font-size:13px}.status-success{background:#d4edda;color:#155724}.status-error{background:#f8d7da;color:#721c24}.http-response-error{color:#dc3545;font-size:13px}.http-response-body{background:#f1f3f5;padding:12px;border-radius:4px;font-family:monospace;font-size:13px;overflow-x:auto;margin:0}.mock-url-section{border-color:#b8daff!important;background:#f0f7ff!important}.mock-url-display{display:flex;align-items:center;gap:10px;padding:10px;background:#fff;border:1px solid #b8daff;border-radius:4px;margin-bottom:8px}.mock-url-display code{flex:1;font-family:monospace;font-size:13px;color:#333;word-break:break-all}.injection-status{padding:3px 8px;border-radius:3px;font-size:11px;font-weight:600;white-space:nowrap}.injection-status.injected{background:#fff3cd;color:#856404}.injection-status.normal{background:#d4edda;color:#155724}.curl-example{white-space:pre-wrap;word-wrap:break-word}.reset-injection-btn{margin-top:12px;padding:8px 16px;background:linear-gradient(135deg,#ff9a56,#ff6a88);color:#fff;border:none;border-radius:4px;font-weight:600;cursor:pointer;transition:all .2s}.reset-injection-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 2px 8px #ff6a884d}.reset-injection-btn:disabled{background:#d4edda;color:#155724;cursor:default;opacity:1}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:#f5f7fa;color:#333}#root{width:100%;min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:30px 20px}.section-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:20px 30px;font-size:18px;font-weight:600}.badge{display:inline-block;padding:4px 12px;border-radius:20px;font-size:12px;font-weight:600}.badge-solved{background:#d4edda;color:#155724}.badge-pending{background:#fff3cd;color:#856404}.badge-in-progress{background:#cfe2ff;color:#084298}.badge-points{background:#e7f3ff;color:#06c}.badge-medium{background:#fff3cd;color:#856404}.badge-hard{background:#f8d7da;color:#721c24}.badge-easy{background:#d4edda;color:#155724}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f5f5f5}#root{width:100%;margin:0 auto;padding:20px}.App{text-align:center;max-width:1200px;margin:0 auto}