:root {
            --primary-blue: #1355a3;
            --primary-green: #6eb52c;
            --light-gray: #f4f7f6;
            --dark-gray: #333;
            --border-color: #ccc;
            --white: #ffffff;
            --error-red: #d9534f;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--light-gray);
            color: var(--dark-gray);
            margin: 0;
            line-height: 1.6;
        }

        .main-container {
            max-width: 900px;
            margin: 2rem auto;
            padding: 2.5rem;
            background-color: var(--white);
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
        }

        .form-header h1 {
            color: var(--primary-blue);
            text-align: center;
            margin-bottom: 0.5rem;
            font-size: 4.5rem;
        }

        .form-header p {
            text-align: center;
            color: #666;
            margin-bottom: 2.5rem;
            font-size: 2.1rem;
        }
        
        .required-notice {
            text-align: center;
            margin-bottom: 2rem;
            color: #555;
            font-style: italic;
        }

        .form-section {
            margin-bottom: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid #e0e0e0;
        }

        .form-section h2 {
            font-size: 1.6rem;
            color: var(--primary-blue);
            margin-top: 0;
            margin-bottom: 1.5rem;
        }

        .form-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.75rem;
        }

        .grid-full-width {
            grid-column: 1 / -1;
        }

        .form-group {
            display: flex;
            flex-direction: column;
        }

        label {
            font-weight: 600;
            margin-bottom: 0.5rem;
            font-size: 1.1em;
            color: #444;
        }

        label .required-star {
            color: var(--error-red);
            font-weight: bold;
        }

        .form-control {
            width: 100%;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1.2em;
            transition: border-color 0.3s, box-shadow 0.3s;
            box-sizing: border-box;
        }

        .form-control:focus {
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(19, 85, 163, 0.15);
            outline: none;
        }

        .dob-group {
            display: flex;
            gap: 10px;
        }

        .dob-group select {
            flex: 1;
        }
        
        #password-feedback {
            margin-top: 8px;
            font-size: 0.9em;
            font-weight: 500;
            height: 1em;
        }
        .msg-success { color: var(--primary-green); }
        .msg-error { color: var(--error-red); }

        .privacy-group {
            margin-top: 1rem;
            padding: 1.5rem;
            background-color: #f9fafb;
            border-left: 5px solid var(--primary-blue);
            border-radius: 4px;
        }

        .privacy-group p, .privacy-group label {
            font-size: 1.1em;
            line-height: 1.7;
        }
        
        .privacy-group label {
             display: flex;
             align-items: center;
             font-weight: 500;
             margin-top: 1rem;
        }

        .privacy-group input[type="checkbox"] {
            width: 1.3em;
            height: 1.3em;
            margin-right: 12px;
            accent-color: var(--primary-blue);
        }

        .submit-btn {
            display: block;
            width: 100%;
            max-width: 320px;
            margin: 2.5rem auto 0;
            padding: 16px;
            background-color: var(--primary-green);
            color: var(--white);
            border: none;
            border-radius: 8px;
            font-size: 2.2rem;
            font-weight: bold;
            cursor: pointer;
            text-align: center;
            transition: background-color 0.3s, transform 0.2s;
        }

        .submit-btn:hover {
            background-color: #5a9e25;
            transform: translateY(-3px);
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        }

        @media (max-width: 768px) {
            .form-grid {
                grid-template-columns: 1fr;
            }
            .main-container {
                padding: 1.5rem;
                margin: 1rem;
            }
            .form-header h1 {
                font-size: 2rem;
            }
        }

        .form-intro-text {
            text-align: center;
            font-size: 1.1em;
            padding: 1rem;
            background-color: #e8f0f7;
            border-radius: 8px;
            margin-bottom: 2rem;
            color: var(--primary-blue);
            border: 1px solid #d1e0ee;
        }
        
        .payment-options-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            align-items: start;
        }
        
        .payment-option {
            display: flex;
            align-items: center;
            padding: 1rem;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s ease-in-out;
        }
        .payment-option:has(input:checked) {
            border-color: var(--primary-blue);
            background-color: #f7f9fc;
            box-shadow: 0 0 0 2px rgba(19, 85, 163, 0.2);
        }
        .payment-option input[type="radio"] {
            margin-right: 12px;
            width: 1.2em;
            height: 1.2em;
            accent-color: var(--primary-blue);
        }
        .payment-option label {
            margin-bottom: 0;
            font-size: 1em;
            font-weight: 500;
        }
        .bank-details {
            padding: 1.5rem;
            background-color: #f9fafb;
            border-radius: 8px;
            margin-top: 1.5rem;
            line-height: 1.8;
        }
        
        /* Promo Code Validation Styles */
        .form-control.promo-valid {
            border-color: var(--primary-green);
            box-shadow: 0 0 0 3px rgba(110, 181, 44, 0.2);
        }
        .form-control.promo-invalid {
            border-color: var(--error-red);
            box-shadow: 0 0 0 3px rgba(217, 83, 79, 0.2);
        }