body {
            font-family: 'Inter', sans-serif;
        }
        .calculator-card {
            background-color: white;
            border-radius: 1rem;
            padding: 2rem;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .calculator-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        .nav-link {
            transition: color 0.3s ease;
            cursor: pointer;
        }
        .nav-link:hover, .nav-link.active {
            color: #3b82f6; /* blue-500 */
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-primary {
            background-color: #3b82f6;
            color: white;
        }
        .btn-primary:hover {
            background-color: #2563eb;
        }
        .result-box {
            background-color: #f3f4f6; /* gray-100 */
            border-left: 4px solid #3b82f6; /* blue-500 */
            padding: 1rem;
            border-radius: 0.5rem;
            margin-top: 1.5rem;
        }
        .page {
            display: none;
        }
        .page.active {
            display: block;
        }