/* Navigation */
        .app-nav {
            background: var(--bg-card);
            border-right: 1px solid var(--border-color);
            width: var(--nav-width);
            height: 100vh;
            position: fixed;
            display: flex;
            flex-direction: column;
            padding: 30px 20px;
            z-index: 100;
            overflow-y: auto;
            overflow-x: hidden;
            -webkit-overflow-scrolling: touch;
        }

        .app-nav::-webkit-scrollbar {
            display: none;
        }

        .app-nav {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }

        .nav-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .app-logo {
            height: 120px;
            width: 120px;
            max-width: 100%;
            object-fit: contain;
            transition: transform 180ms ease;
            margin-bottom: 10px;
            background: white;
            padding: 12px;
            border-radius: 20px;
            box-shadow: var(--shadow-sm);
        }

        @media (max-width: 1366px) {
            .app-logo {
                height: 100px;
            }
        }

        @media (max-width: 1024px) {
            .app-logo {
                height: 75px;
            }
        }

        .nav-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex: 1;
        }

        .nav-btn {
            background: transparent;
            border: none;
            padding: 14px 20px;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-muted);
            text-align: left;
            display: flex;
            align-items: center;
            gap: 15px;
            cursor: pointer;
            transition: background-color 180ms ease, color 180ms ease, transform 180ms ease;
        }

        .nav-btn i {
            font-size: 1.2rem;
            width: 24px;
            text-align: center;
        }

        .nav-btn:hover {
            background: var(--bg-body);
            color: var(--primary);
        }

        .nav-btn:active {
            transform: scale(.97);
        }