:root {
            --primary-color: #d1b06b;
            /* LegalXcode Orange */
            --secondary-color: #1e293b;
            /* Dark Slate */
            --light-bg: #f8f9fa;
            --border-radius: 12px;
        }

        .gst-section {
            background-color: #fdfdfd;
            padding: 80px 0;
            font-family: 'Inter', sans-serif;
        }

        /* Card Styling */
        .calculator-card {
            border: none;
            border-radius: var(--border-radius);
            box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            background: #fff;
        }

        .card-header-custom {
            background: var(--primary-color);
            color: white;
            padding: 20px;
            text-align: center;
        }

        .card-header-custom h1 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* Form Elements */
        .form-label {
            font-weight: 600;
            color: var(--secondary-color);
            font-size: 0.9rem;
            margin-bottom: 8px;
        }

        .form-control {
            border: 1px solid #e2e8f0;
            padding: 12px;
            border-radius: 8px;
            font-size: 1rem;
        }

        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(230, 81, 0, 0.1);
        }

        /* Custom Radio Buttons (Toggle Style) */
        .btn-group-custom {
            display: flex;
            gap: 10px;
            width: 100%;
        }

        .btn-check:checked+.btn-custom {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            box-shadow: 0 4px 6px rgba(230, 81, 0, 0.3);
        }

        .btn-custom {
            flex: 1;
            border: 1px solid #e2e8f0;
            color: #64748b;
            background: #fff;
            padding: 10px;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.2s ease;
        }

        .btn-custom:hover {
            background-color: #fff7ed;
            color: var(--primary-color);
            border-color: var(--primary-color);
        }

        /* Rate Grid */
        .rate-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
        }

        /* Result Box */
        .result-container {
            background: var(--secondary-color);
            color: white;
            height: 100%;
            padding: 40px 30px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
        }

        .result-item {
            margin-bottom: 25px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding-bottom: 15px;
        }

        .result-item:last-child {
            border-bottom: none;
            margin-bottom: 0;
        }

        .result-label {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            opacity: 0.7;
            margin-bottom: 5px;
            display: block;
        }

        .result-value {
            font-size: 1.75rem;
            font-weight: 700;
            color: #fff;
            display: block;
        }

        .profit-highlight {
            color: #4ade80;
            /* Green for profit */
        }

        @media (max-width: 768px) {
            .result-container {
                border-radius: 0 0 var(--border-radius) var(--border-radius);
                padding: 30px;
            }

            .rate-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }