.admin-layout{display:flex;min-height:100vh}.admin-sidebar{width:240px;background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;transition:width .2s}.admin-sidebar.collapsed{width:60px}.admin-sidebar-header{padding:16px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}.admin-sidebar-header h2{margin:0;font-size:18px;color:var(--text-primary)}.admin-collapse-btn{background:none;border:none;color:var(--text-secondary);cursor:pointer;font-size:14px;padding:4px 8px;border-radius:var(--radius-sm)}.admin-collapse-btn:hover{background:var(--bg-tertiary)}.admin-nav{flex:1;padding:8px;display:flex;flex-direction:column;gap:2px}.admin-nav-link{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);color:var(--text-secondary);text-decoration:none;font-size:14px;font-weight:500;transition:all .15s}.admin-nav-link:hover{background:var(--bg-tertiary);color:var(--text-primary)}.admin-nav-link.active{background:var(--primary);color:#fff}.admin-nav-icon{width:24px;text-align:center;font-size:16px;flex-shrink:0}.admin-sidebar-footer{padding:8px;border-top:1px solid var(--border)}.back-link{color:var(--text-hint)!important}.admin-main{flex:1;margin-left:240px;padding:24px;min-height:100vh;transition:margin-left .2s}.admin-sidebar.collapsed+.admin-main{margin-left:60px}.admin-page-header{margin-bottom:24px}.admin-page-header h1{margin:0 0 4px;font-size:24px;color:var(--text-primary)}.admin-page-header p{margin:0;color:var(--text-secondary);font-size:14px}.admin-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px}.admin-stat-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.admin-stat-card .stat-label{font-size:12px;color:var(--text-hint);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}.admin-stat-card .stat-value{font-size:28px;font-weight:700;color:var(--text-primary)}.admin-stat-card .stat-sub{font-size:12px;color:var(--text-secondary);margin-top:4px}.admin-table-container{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto}.admin-table{width:100%;border-collapse:collapse;font-size:14px}.admin-table th{text-align:left;padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text-hint);font-size:12px;text-transform:uppercase;letter-spacing:.5px;font-weight:600;white-space:nowrap}.admin-table td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text-primary)}.admin-table tr:last-child td{border-bottom:none}.admin-table tr:hover td{background:var(--bg-tertiary)}.admin-table a{color:var(--primary-light);text-decoration:none}.admin-table a:hover{text-decoration:underline}.badge{display:inline-block;padding:2px 8px;border-radius:12px;font-size:12px;font-weight:600}.badge-active,.badge-completed{background:#10b98126;color:var(--success)}.badge-suspended,.badge-cancelled{background:#ef444426;color:var(--error)}.badge-pending,.badge-draft,.badge-registration{background:#f59e0b26;color:var(--warning)}.badge-in_progress,.badge-admin{background:#4f46e526;color:var(--primary-light)}.admin-toolbar{display:flex;gap:12px;margin-bottom:16px;flex-wrap:wrap;align-items:center}.admin-toolbar input,.admin-toolbar select{padding:8px 12px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px}.admin-toolbar input:focus,.admin-toolbar select:focus{outline:none;border-color:var(--primary)}.admin-toolbar input::placeholder{color:var(--text-hint)}.admin-pagination{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:16px;padding:12px 0}.admin-pagination button{padding:6px 12px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);cursor:pointer;font-size:13px}.admin-pagination button:hover:not(:disabled){background:var(--bg-tertiary)}.admin-pagination button:disabled{opacity:.4;cursor:not-allowed}.admin-pagination span{color:var(--text-secondary);font-size:13px}.admin-form{display:flex;flex-direction:column;gap:16px;max-width:600px}.admin-form-group{display:flex;flex-direction:column;gap:4px}.admin-form-group label{font-size:13px;font-weight:600;color:var(--text-secondary)}.admin-form-group input,.admin-form-group select{padding:10px 14px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px}.admin-form-group input:focus,.admin-form-group select:focus{outline:none;border-color:var(--primary)}.admin-form-actions{display:flex;gap:12px;margin-top:8px}.admin-btn{padding:8px 16px;border:none;border-radius:var(--radius-sm);font-size:13px;font-weight:600;cursor:pointer;transition:opacity .15s}.admin-btn:hover{opacity:.85}.admin-btn:disabled{opacity:.5;cursor:not-allowed}.admin-btn-primary{background:var(--primary);color:#fff}.admin-btn-danger{background:var(--error);color:#fff}.admin-btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border)}.admin-btn-sm{padding:4px 10px;font-size:12px}.admin-chart-section{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:24px}.admin-chart-section h3{margin:0 0 16px;font-size:16px;color:var(--text-primary)}.admin-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}.admin-detail-section{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.admin-detail-section h3{margin:0 0 16px;font-size:16px;color:var(--text-primary)}.admin-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:200}.admin-modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:24px;min-width:360px;max-width:480px}.admin-modal h3{margin:0 0 12px;color:var(--text-primary)}.admin-modal p{margin:0 0 20px;color:var(--text-secondary)}.admin-modal-actions{display:flex;gap:12px;justify-content:flex-end}.admin-active-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}@media (max-width: 768px){.admin-sidebar{width:60px}.admin-sidebar .admin-nav-link span:not(.admin-nav-icon){display:none}.admin-sidebar-header h2{display:none}.admin-main{margin-left:60px;padding:16px}.admin-stats-grid{grid-template-columns:1fr 1fr}.admin-detail-grid,.admin-active-grid{grid-template-columns:1fr}}:root{--primary: #4F46E5;--primary-light: #818CF8;--primary-lighter: #E0E7FF;--primary-dark: #3730A3;--primary-darker: #312E81;--success: #10B981;--warning: #F59E0B;--error: #EF4444;--bg: #0F172A;--bg-card: #1E293B;--bg-surface: #334155;--text: #F8FAFC;--text-secondary: #94A3B8;--text-hint: #64748B;--border: #475569;--radius: 12px;--radius-sm: 8px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}a{color:var(--primary-light);text-decoration:none}a:hover{text-decoration:underline}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border:none;border-radius:var(--radius-sm);font-size:15px;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-outline{background:transparent;color:var(--primary-light);border:1px solid var(--border)}.btn-outline:hover{border-color:var(--primary-light);background:#4f46e51a}.card{background:var(--bg-card);border-radius:var(--radius);padding:24px;border:1px solid var(--border)}input,select,textarea{width:100%;padding:10px 14px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-surface);color:var(--text);font-size:15px;outline:none;transition:border .2s}input:focus,select:focus,textarea:focus{border-color:var(--primary)}input::placeholder{color:var(--text-hint)}.container{max-width:1200px;margin:0 auto;padding:0 20px}.oauth-divider{display:flex;align-items:center;gap:12px;margin-bottom:20px;color:var(--text-hint);font-size:13px}.oauth-divider:before,.oauth-divider:after{content:"";flex:1;height:1px;background:var(--border)}.top-nav{padding:12px 24px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border);background:var(--bg-card);position:relative}.top-nav-logo{display:flex;align-items:center;gap:10px;font-size:1.5rem;font-weight:700;color:var(--text);text-decoration:none}.top-nav-logo:hover{text-decoration:none}.nav-links{display:flex;gap:16px;align-items:center}.nav-link{color:var(--text-secondary);font-size:14px;font-weight:500;text-decoration:none}.nav-link:hover{color:var(--text);text-decoration:none}.nav-link-admin{color:var(--primary-light);font-weight:600}.nav-username{color:var(--text-secondary);font-size:14px}.hamburger{display:none;flex-direction:column;justify-content:center;gap:5px;background:none;border:none;cursor:pointer;padding:4px;z-index:10}.hamburger span{display:block;width:24px;height:2px;background:var(--text);border-radius:2px;transition:transform .2s}@media (max-width: 768px){.hamburger{display:flex}.nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;background:var(--bg-card);border-bottom:1px solid var(--border);padding:16px 24px;gap:12px;z-index:100}.nav-links.open{display:flex}.nav-link,.nav-username{font-size:16px;padding:4px 0}.nav-links .btn{width:100%;text-align:center}}