body { font-family: 'Noto Sans KR', sans-serif; }
        
        /* Sidebar & Layout */
        .sidebar-item {
            position: relative;
            overflow: hidden;
            transition: all 0.2s ease;
        }
        .sidebar-item.active {
            background: #F3F4F6;
            color: #7C3AED;
            font-weight: 600;
        }
        .sidebar-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            height: 100%;
            width: 4px;
            background: #7C3AED;
        }

        /* Help Card Hover */
        .help-card {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .help-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            border-color: #C084FC;
        }

        /* Accordion Transition */
        .accordion-content {
            transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }
        .accordion-content.open {
            max-height: 500px; /* Arbitrary large height */
            opacity: 1;
        }
        .accordion-icon {
            transition: transform 0.3s ease;
        }
        .accordion-btn[aria-expanded="true"] .accordion-icon {
            transform: rotate(180deg);
        }

        /* Search Input Focus */
        .search-container:focus-within {
            box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.1);
            border-color: #7C3AED;
        }

        /* Animations */
        .fade-in { animation: fadeIn 0.4s ease-out forwards; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

        /* Custom Scrollbar */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: #94a3b8; }