:root {
            --dark-blue: #1C338A;
            --primary-yellow: #FFD700;
            --light-bg: #F8FAFC;
            --dark-text: #1F2937;
            --gray-text: #6B7280;
        }
        
        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--light-bg);
            font-size: 1rem;
        }
        
        .main-container {
            background-color: var(--light-bg);
            box-shadow: none;
        }

        .input-field {
            border: none;
            border-bottom: 1px solid #E2E8F0;
            background-color: transparent;
        }

        .input-field:focus, 
            #amount:focus {
            outline: none;
            box-shadow: 0 0 0 2px var(--dark-blue);
         }

        .pay-button {
            background-color: var(--primary-yellow);
            color: var(--dark-blue);
            font-weight: 700;
        }

        .pay-button:hover {
            background-color: #e0bf00;
        }
        
        .checkbox-group input[type="checkbox"]:checked {
            background-color: var(--primary-yellow);
            border-color: var(--primary-yellow);
        }

        .checkbox-group input[type="checkbox"] {
            appearance: none;
            width: 1.25rem;
            height: 1.25rem;
            border: 1px solid #D1D5DB;
            border-radius: 0.25rem;
            cursor: pointer;
            position: relative;
        }

        .checkbox-group input[type="checkbox"]:checked::after {
            content: '\2713';
            font-size: 0.875rem;
            color: var(--dark-blue);
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .section-title {
            color: var(--dark-text);
        }

        .message-box {
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 12px 16px;
        margin-bottom: 20px;
        border-radius: 8px;
        font-size: 0.95rem;
        font-weight: 500;
        background-color: #fff3cd; /* soft yellow */
        color: #856404; /* dark yellow text */
        border: 1px solid #ffeeba;
        }

        .message-box i {
          font-size: 1.2rem;
          color: #d39e00; /* stronger yellow for icon */
        }