*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f0f2f5;color:#333}.layout{display:flex;min-height:100vh}.sidebar{width:200px;background:#1a1a2e;color:#fff;padding:20px 0;flex-shrink:0}.sidebar h2{font-size:16px;text-align:center;padding:0 16px 20px;border-bottom:1px solid #333;margin-bottom:12px}.sidebar a{display:block;padding:10px 24px;color:#aaa;text-decoration:none;font-size:14px}.sidebar a:hover,.sidebar a.active{color:#fff;background:#16213e}.main{flex:1;padding:24px}.card{background:#fff;border-radius:8px;padding:20px;margin-bottom:16px;box-shadow:0 1px 3px #0000000f}.card h3{font-size:16px;margin-bottom:16px;color:#333}.stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin-bottom:20px}.stat-card{background:#fff;border-radius:8px;padding:16px;box-shadow:0 1px 3px #0000000f}.stat-card .label{font-size:12px;color:#999}.stat-card .value{font-size:28px;font-weight:700;color:#333;margin-top:4px}.stat-card .value.green{color:#28a745}.stat-card .value.blue{color:#4a90d9}.stat-card .value.red{color:#dc3545}.stat-card .value.orange{color:#f0ad4e}input,select,textarea{padding:6px 10px;border:1px solid #ddd;border-radius:4px;font-size:13px}input:focus,select:focus,textarea:focus{outline:none;border-color:#4a90d9}textarea{width:100%;min-height:60px;resize:vertical}.btn{padding:6px 16px;border:none;border-radius:4px;font-size:13px;cursor:pointer}.btn-primary{background:#4a90d9;color:#fff}.btn-primary:hover{background:#3a7bc8}.btn-danger{background:#e74c3c;color:#fff}.btn-danger:hover{background:#c0392b}.btn-success{background:#28a745;color:#fff}.btn-sm{padding:4px 10px;font-size:12px}.msg{padding:6px 10px;border-radius:4px;margin-bottom:12px;font-size:13px}.msg-success{background:#d4edda;color:#155724}.msg-error{background:#f8d7da;color:#721c24}table{width:100%;border-collapse:collapse;font-size:13px}th,td{padding:8px 10px;text-align:left;border-bottom:1px solid #eee}th{background:#fafafa;color:#666;font-weight:600}tr:hover{background:#f8f9fa}input[type=checkbox]{cursor:pointer}.login-page{display:flex;justify-content:center;align-items:center;min-height:100vh}.login-card{width:320px}.login-card h2{text-align:center;margin-bottom:20px}.flex{display:flex;gap:8px;align-items:center}.mb-12{margin-bottom:12px}.status-dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px}.status-dot.online{background:#28a745}.status-dot.offline{background:#dc3545}