:root{--primary:#1a5276;--accent:#e74c3c;--bg:#f0f3f7;--sidebar:#0e3a56;--sidebar-w:220px;}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;background:var(--bg);color:#333;font-size:14px}
.admin-wrap{display:flex;min-height:100vh}
.admin-sidebar{width:var(--sidebar-w);background:var(--sidebar);color:#fff;position:fixed;top:0;left:0;bottom:0;overflow-y:auto}
.admin-sidebar .logo{padding:20px;text-align:center;font-size:18px;font-weight:700;border-bottom:1px solid rgba(255,255,255,.1)}
.admin-sidebar .logo small{font-size:12px;font-weight:400;color:#aaa}
.admin-sidebar nav ul{list-style:none;padding:10px 0}
.admin-sidebar nav a{display:block;padding:12px 20px;color:#ccc;text-decoration:none;transition:.2s}
.admin-sidebar nav a:hover,.admin-sidebar nav a.active{background:rgba(255,255,255,.08);color:#fff;border-left:3px solid var(--primary)}
.admin-main{flex:1;margin-left:var(--sidebar-w);padding:20px}
.admin-topbar{background:#fff;padding:15px 20px;border-radius:8px;margin-bottom:20px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 1px 3px rgba(0,0,0,.05)}
.admin-topbar h1{font-size:18px;color:var(--primary)}
.admin-topbar .user-info{color:#666;font-size:13px}
.admin-topbar .user-info a{color:var(--primary);margin-left:10px;text-decoration:none}
.card{background:#fff;border-radius:8px;padding:20px;margin-bottom:20px;box-shadow:0 1px 3px rgba(0,0,0,.05)}
.card h2{font-size:16px;margin-bottom:15px;padding-bottom:10px;border-bottom:1px solid #eee;color:var(--primary)}
table{width:100%;border-collapse:collapse;font-size:13px}
table th,table td{padding:10px;border-bottom:1px solid #eee;text-align:left}
table th{background:#f8f9fa;font-weight:600;color:#555}
table tr:hover{background:#fafafa}
.btn{display:inline-block;padding:6px 14px;border-radius:4px;text-decoration:none;font-size:13px;cursor:pointer;border:none}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:#0e3a56}
.btn-success{background:#28a745;color:#fff}
.btn-warning{background:#f0ad4e;color:#fff}
.btn-danger{background:#dc3545;color:#fff}
.btn-sm{padding:4px 10px;font-size:12px}
.form-group{margin-bottom:15px}
.form-group label{display:block;margin-bottom:5px;font-weight:600;color:#555}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:8px 10px;border:1px solid #ddd;border-radius:4px;font-size:13px}
.form-group textarea{min-height:80px;resize:vertical}
.search-bar{display:flex;gap:10px;margin-bottom:15px;flex-wrap:wrap}
.search-bar input,.search-bar select{padding:6px 10px;border:1px solid #ddd;border-radius:4px;font-size:13px}
.pagination{margin-top:15px;text-align:center}
.pagination a,.pagination span{display:inline-block;padding:5px 10px;margin:0 2px;border:1px solid #ddd;border-radius:3px;text-decoration:none;color:#333;font-size:12px}
.pagination a:hover,.pagination span.current{background:var(--primary);color:#fff;border-color:var(--primary)}
.badge{display:inline-block;padding:2px 8px;border-radius:3px;font-size:11px}
.badge-green{background:#d4edda;color:#155724}
.badge-red{background:#f8d7da;color:#721c24}
.badge-yellow{background:#fff3cd;color:#856404}
.badge-blue{background:#cce5ff;color:#004085}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:15px;margin-bottom:20px}
.stat-card{background:#fff;border-radius:8px;padding:20px;text-align:center;box-shadow:0 1px 3px rgba(0,0,0,.05)}
.stat-card .num{font-size:28px;font-weight:700;color:var(--primary);margin-bottom:5px}
.stat-card .label{color:#888;font-size:13px}
.level-tag{display:inline-block;padding:2px 8px;border-radius:3px;font-size:11px}
.level-1{background:#e9ecef;color:#495057}
.level-2{background:#d1ecf1;color:#0c5460}
.level-3{background:#fff3cd;color:#856404}
.level-4{background:#f8d7da;color:#721c24}
@media(max-width:768px){
.admin-sidebar{position:relative;width:100%;height:auto}
.admin-wrap{flex-direction:column}
.admin-main{margin-left:0}
}