:root{--primary: #4F46E5;--primary-hover: #4338CA;--primary-light: #E0E7FF;--bg-body: #F3F4F6;--bg-card: #FFFFFF;--text-main: #111827;--text-secondary: #6B7280;--border: #E5E7EB;--success: #10B981;--warning: #F59E0B;--danger: #EF4444;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--font-sans: "Inter", system-ui, -apple-system, sans-serif;--transition-fast: .2s ease}body{font-family:var(--font-sans);background-color:var(--bg-body);color:var(--text-main);margin:0;display:block;-webkit-font-smoothing:antialiased;min-height:100vh}button{font-family:var(--font-sans)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}.app-layout{display:flex;min-height:100vh;background-color:var(--bg-body)}.main-content{flex:1;padding:2rem;overflow-y:auto;max-width:100vw;transition:padding var(--transition-fast)}.sidebar{width:280px;background-color:var(--bg-card);border-right:1px solid var(--border);display:flex;flex-direction:column;position:sticky;top:0;height:100vh;z-index:50;transition:transform .3s ease}.sidebar-header{padding:1.5rem 2rem;display:flex;align-items:center;justify-content:space-between}.sidebar-title{font-size:1.5rem;font-weight:700;color:var(--primary);margin:0;letter-spacing:-.025em}.nav-links{list-style:none;padding:1rem;display:flex;flex-direction:column;gap:.5rem;flex:1}.nav-link{display:flex;align-items:center;gap:12px;padding:12px 16px;text-decoration:none;color:var(--text-secondary);border-radius:var(--radius-md);transition:all var(--transition-fast);font-weight:500}.nav-link:hover{background-color:var(--primary-light);color:var(--primary)}.nav-link.active{background-color:var(--primary-light);color:var(--primary);font-weight:600}.sidebar-footer{padding:1rem;border-top:1px solid var(--border)}.logout-btn{width:100%;display:flex;align-items:center;gap:12px;padding:12px 16px;background:none;border:none;color:var(--danger);cursor:pointer;border-radius:var(--radius-md);font-weight:500;transition:background-color var(--transition-fast);text-align:left}.logout-btn:hover{background-color:#fef2f2}.mobile-header{display:none;align-items:center;justify-content:space-between;padding:1rem;background-color:var(--bg-card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:40}.mobile-title{font-size:1.25rem;font-weight:700;color:var(--primary);margin:0}.menu-btn,.close-sidebar-btn{background:none;border:none;padding:8px;cursor:pointer;color:var(--text-main);display:flex;align-items:center;justify-content:center}.close-sidebar-btn{display:none}.sidebar-overlay{display:none;position:fixed;inset:0;background-color:#00000080;z-index:45;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}@media(max-width:768px){.app-layout{flex-direction:column}.sidebar{position:fixed;top:0;left:0;height:100%;transform:translate(-100%);box-shadow:var(--shadow-lg)}.sidebar.open{transform:translate(0)}.mobile-header,.close-sidebar-btn{display:flex}.sidebar-overlay{display:block}.main-content{padding:1rem}}.loading-screen{display:flex;justify-content:center;align-items:center;height:100vh;background-color:var(--bg-body)}.spinner{width:40px;height:40px;border:4px solid var(--primary-light);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.page-header{margin-bottom:2rem}.page-title{font-size:1.875rem;font-weight:700;color:var(--text-main);margin-bottom:.5rem}.page-subtitle{color:var(--text-secondary)}.card{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:1.5rem;border:1px solid var(--border);transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;margin-bottom:2rem}.stat-card{background:var(--bg-card);padding:1.5rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border);display:flex;align-items:center;gap:1rem}.stat-icon-wrapper{padding:12px;border-radius:12px;display:flex;align-items:center;justify-content:center}.stat-icon-wrapper.purple{background-color:#eef2ff;color:#4f46e5}.stat-icon-wrapper.green{background-color:#ecfdf5;color:#10b981}.stat-icon-wrapper.red{background-color:#fef2f2;color:#ef4444}.stat-content h3{font-size:.875rem;color:var(--text-secondary);font-weight:500;margin:0 0 4px}.stat-content p{font-size:1.5rem;color:var(--text-main);font-weight:700;margin:0}.login-container{display:flex;justify-content:center;align-items:center;min-height:100vh;background:linear-gradient(135deg,#4f46e5,#7c3aed);padding:1rem}.login-card{background:#fff;border-radius:var(--radius-xl);padding:3rem;box-shadow:0 25px 50px -12px #00000040;width:100%;max-width:420px;text-align:center}.btn-google{background-color:#fff;color:#374151;border:1px solid #D1D5DB;transition:all .2s;width:100%;display:flex;align-items:center;justify-content:center;gap:12px;padding:12px;border-radius:var(--radius-md);font-weight:500;cursor:pointer}.btn-google:hover{background-color:#f9fafb;border-color:#9ca3af}.btn-google:disabled{opacity:.6;cursor:not-allowed}.table-container{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);overflow:hidden;border:1px solid var(--border);margin-top:1.5rem;overflow-x:auto}.data-table{width:100%;border-collapse:collapse;text-align:left}.data-table th,.data-table td{padding:1rem 1.5rem;border-bottom:1px solid var(--border)}.data-table th{background-color:var(--bg-body);color:var(--text-secondary);font-weight:600;font-size:.875rem;text-transform:uppercase;letter-spacing:.05em}.data-table tr:last-child td{border-bottom:none}.data-table tr:hover td{background-color:#f9fafb}.form-card{background:var(--bg-card);padding:2rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border);max-width:600px}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500;color:var(--text-main);font-size:.95rem}.form-control{width:100%;padding:.75rem 1rem;border:1px solid var(--border);border-radius:var(--radius-md);font-size:1rem;background-color:#fff;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);font-family:inherit}.form-control:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}textarea.form-control{min-height:120px;resize:vertical}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.625rem 1.25rem;border-radius:var(--radius-md);font-weight:500;font-size:.95rem;cursor:pointer;transition:all var(--transition-fast);border:1px solid transparent;gap:8px}.btn:hover{transform:translateY(-1px)}.btn-primary{background-color:var(--primary);color:#fff;box-shadow:0 1px 2px #0000000d}.btn-primary:hover{background-color:var(--primary-hover)}.btn-secondary{background-color:#fff;border-color:var(--border);color:var(--text-main)}.btn-secondary:hover{background-color:var(--bg-body);border-color:#d1d5db}.btn-danger{background-color:var(--danger);color:#fff}.btn-danger:hover{background-color:#dc2626}.btn-block{width:100%}.badge{display:inline-flex;align-items:center;padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:600;text-transform:uppercase}.badge-success{background-color:#d1fae5;color:#065f46}.badge-warning{background-color:#fef3c7;color:#92400e}.badge-danger{background-color:#fee2e2;color:#991b1b}.badge-info{background-color:#dbeafe;color:#1e40af}.challenge-actions{display:flex;gap:1rem;margin-bottom:2rem}.modal-overlay{position:fixed;inset:0;background-color:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);padding:1rem}.modal-content{background:#fff;padding:2rem;border-radius:var(--radius-lg);width:100%;max-width:700px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg);animation:slideUp .3s ease-out}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;border-bottom:1px solid var(--border);padding-bottom:1rem}.modal-title{font-size:1.25rem;font-weight:700;color:var(--text-main);margin:0}.modal-close-btn{background:none;border:none;cursor:pointer;color:var(--text-secondary);padding:4px;border-radius:4px;transition:background-color var(--transition-fast)}.modal-close-btn:hover{background-color:var(--bg-body);color:var(--danger)}.modal-body{margin-bottom:1.5rem}.modal-footer{display:flex;justify-content:flex-end;gap:1rem;padding-top:1rem;border-top:1px solid var(--border)}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.challenge-list{display:flex;flex-direction:column;gap:1rem}.challenge-card{background:var(--bg-card);padding:1.5rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border);display:flex;justify-content:space-between;align-items:flex-start;transition:box-shadow var(--transition-fast)}.challenge-card:hover{box-shadow:var(--shadow-lg)}.challenge-info h3{margin:0 0 .5rem;font-size:1.125rem;color:var(--text-main)}.challenge-meta{display:flex;gap:1rem;color:var(--text-secondary);font-size:.875rem;align-items:center;flex-wrap:wrap}.challenge-prizes{margin-top:1rem;display:flex;gap:.5rem;flex-wrap:wrap}.prize-section{background-color:#f8fafc;padding:1.25rem;border-radius:var(--radius-md);margin-bottom:1.5rem;border:1px solid var(--border)}.prize-header{margin:0 0 1rem;font-size:1rem;font-weight:600;display:flex;align-items:center;gap:8px;color:var(--warning)}.avatar{width:40px;height:40px;border-radius:50%;background-color:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:600}.feedback-detail{background-color:#f8fafc;padding:1rem;border-radius:var(--radius-md);margin-top:.5rem}.leaderboard-page{max-width:1200px;margin:0 auto}.podium-container{display:flex;justify-content:center;align-items:flex-end;gap:1.5rem;margin-bottom:3rem;padding:0 1rem}.podium-item{display:flex;flex-direction:column;align-items:center}.podium-user{display:flex;flex-direction:column;align-items:center;margin-bottom:1rem;transition:transform var(--transition-fast)}.podium-winner{transform:scale(1.1)}.crown-icon{color:#f59e0b;margin-bottom:.5rem;animation:bounce 1s infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.podium-avatar{width:4rem;height:4rem;border-radius:50%;border:4px solid;overflow:hidden;box-shadow:var(--shadow-lg);background-color:#f3f4f6;display:flex;align-items:center;justify-content:center}.podium-avatar.rank-1{border-color:#fcd34d}.podium-avatar.rank-2{border-color:#d1d5db}.podium-avatar.rank-3{border-color:#fb923c}.podium-avatar img{width:100%;height:100%;object-fit:cover}.avatar-initials{font-size:1.25rem;font-weight:700;color:var(--text-secondary)}.podium-username{font-weight:700;margin-top:.5rem;color:var(--text-main);font-size:.875rem}.podium-score{font-size:.75rem;color:var(--text-secondary);font-weight:600}.podium-block{width:8rem;background:linear-gradient(to bottom,#4f46e5,#3730a3);border-radius:var(--radius-lg) var(--radius-lg) 0 0;box-shadow:var(--shadow-xl);display:flex;align-items:center;justify-content:center;color:#fff;position:relative}.podium-height-1{height:12rem}.podium-height-2{height:8rem}.podium-height-3{height:6rem}.podium-rank{font-size:2.5rem;font-weight:800;opacity:.5}.rank-cell{font-family:Courier New,monospace;color:var(--text-secondary);font-weight:600}.participant-info{display:flex;align-items:center;gap:.75rem}.participant-avatar{width:2rem;height:2rem;border-radius:50%;background-color:#e5e7eb;display:flex;align-items:center;justify-content:center;overflow:hidden}.participant-avatar img{width:100%;height:100%;object-fit:cover}.avatar-initials-small{font-size:.75rem;font-weight:700;color:var(--text-secondary)}.participant-name{color:var(--text-main);font-weight:500}.score-cell{font-weight:700;color:var(--primary)}@media(max-width:768px){.podium-container{gap:1rem}.podium-block{width:5rem}.podium-height-1{height:10rem}.podium-height-2{height:7rem}.podium-height-3{height:5rem}}.feedback-page{max-width:1000px;margin:0 auto}.feedback-list{display:flex;flex-direction:column;gap:1rem}.feedback-card{background:var(--bg-card);padding:1.5rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:2px solid transparent;transition:all var(--transition-fast)}.feedback-card.marked{border-color:var(--success)}.feedback-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:1rem}.feedback-user-info{display:flex;align-items:center;gap:.75rem}.feedback-avatar{width:2.5rem;height:2.5rem;border-radius:50%;object-fit:cover}.feedback-avatar-placeholder{width:2.5rem;height:2.5rem;border-radius:50%;background-color:#e5e7eb;display:flex;align-items:center;justify-content:center}.feedback-username{font-weight:600;font-size:1rem;color:var(--text-main)}.feedback-email{font-size:.85rem;color:var(--text-secondary)}.feedback-rating{display:flex;gap:.5rem;align-items:center}.stars-container{display:flex;gap:3px}.feedback-comment{background:#f9fafb;padding:1rem;border-radius:var(--radius-md);margin-bottom:1rem;font-size:.95rem;line-height:1.6;color:#374151}.feedback-footer{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--text-secondary)}.feedback-date{display:flex;align-items:center;gap:.5rem}.feedback-actions{display:flex;gap:.75rem}.btn-marked{background-color:var(--success);color:#fff}.btn-marked:hover{background-color:#059669}.btn-delete{background-color:#fee2e2;color:var(--danger)}.btn-delete:hover{background-color:#fecaca}.error-banner{background:#fee2e2;color:#b91c1c;padding:.75rem 1rem;border-radius:var(--radius-md);margin-bottom:1.5rem;display:flex;align-items:center;gap:.75rem}.error-close-btn{margin-left:auto;background:none;border:none;cursor:pointer;font-size:1.5rem;color:#b91c1c}.pagination{margin-top:2rem;display:flex;justify-content:center;gap:1rem;align-items:center}.pagination-info{color:var(--text-secondary);font-size:.875rem}.user-cell{display:flex;flex-direction:column}.user-cell .username{font-weight:600;color:var(--text-main)}.user-cell .email{font-size:.8rem;color:var(--text-secondary)}.code-badge{display:inline-block;background:#eff6ff;color:#1d4ed8;padding:2px 6px;border-radius:4px;font-size:.7rem;font-family:monospace;width:fit-content;margin-top:2px}.text-green{color:#10b981;font-weight:600}.action-btn{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:var(--bg-body);border:1px solid var(--border);border-radius:6px;cursor:pointer;font-size:.85rem;color:var(--text-main);transition:all .2s}.action-btn:hover{background:#f3f4f6;border-color:#d1d5db}.action-btn.success{background:#10b981;color:#fff;border-color:#059669}.action-btn.success:hover{background:#059669}.back-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem 1rem;background:transparent;border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;margin-right:1.5rem;color:var(--text-secondary)}.back-btn:hover{background:var(--bg-body);color:var(--text-main)}.status-badge{padding:4px 8px;border-radius:12px;font-size:.75rem;font-weight:600;text-transform:uppercase}.status-badge.completed,.status-badge.paid,.status-badge.approved{background:#d1fae5;color:#065f46}.status-badge.pending{background:#fef3c7;color:#92400e}.status-badge.rejected,.status-badge.cancelled{background:#fee2e2;color:#991b1b}.referral-tree{display:flex;flex-direction:column;gap:1rem}.tree-node{background:#fff;border:1px solid var(--border);border-radius:8px;padding:1rem}.tree-node.level-1{border-left:4px solid #6366f1}.tree-node.level-2{margin-top:1rem;margin-left:2rem;border-left:4px solid #a5b4fc;background:#f8fafc}.node-content{display:flex;align-items:center;gap:1rem}.node-name{font-weight:600;color:var(--text-main)}.node-plan{font-size:.7rem;background:#e0e7ff;color:#4338ca;padding:2px 6px;border-radius:4px}.node-date{font-size:.8rem;color:var(--text-secondary);margin-left:auto}.node-marker{color:#94a3b8;font-size:1.2rem}