/* 네비게이션 드롭다운 UI/UX 개선 */
        .nav-group { position: relative; display: inline-block; cursor: pointer; font-weight: 600; }
        .nav-group-title { padding: 8px 12px; color: rgba(255,255,255,0.85); transition: color 0.3s; }
        .nav-group:hover .nav-group-title { color: #a78bfa; }
        .nav-dropdown {
            display: none; position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
            background: rgba(15,15,30,0.95); border: 1px solid rgba(139,92,246,0.3); border-radius: 12px;
            padding: 10px; min-width: 170px; z-index: 1000; backdrop-filter: blur(12px); box-shadow: 0 10px 30px rgba(0,0,0,0.5);
        }
        .nav-group:hover .nav-dropdown { display: block; }
        .nav-dropdown a {
            display: block !important; padding: 10px 15px !important; margin: 0 !important;
            text-align: center; font-size: 0.95rem !important; font-weight: 600 !important;
            border-bottom: 1px solid rgba(255,255,255,0.05) !important; color: #fff !important;
        }
        .nav-dropdown a:last-child { border-bottom: none !important; }
        
        @media screen and (max-width: 768px) {
            .nav-group { width: 100%; text-align: center; margin: 0; }
            .nav-group-title { display: block; font-size: 1.1rem; padding: 12px; border-bottom: 1px solid rgba(255,255,255,0.08); }
            .nav-dropdown {
                display: none; position: static; transform: none; box-shadow: none;
                background: rgba(255,255,255,0.03); border: none; border-radius: 8px; margin-top: 5px;
            }
            .nav-group.mobile-active .nav-dropdown { display: block; }
        }