body {
        background: #f2fdf5;
        font-family: Arial, sans-serif;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        min-height: 100vh;
        margin: 0;
        padding: 10px 10px 40px; /* space for footer */
        position: relative;
        -webkit-user-select:none; /* nonaktifkan select */
        -moz-user-select:none;
        -ms-user-select:none;
        user-select:none;
    }
    form {
        background: white;
        padding: 10px;
        border-radius: 6px;
        box-shadow: 0 0 8px rgba(0,0,0,0.1);
        max-width: 400px;
        width: 90%;
        box-sizing: border-box;
        text-align: center;
        user-select:text; /* form input bisa di select */
    }
    h2 {
        margin-top: 1px;
        margin-bottom: 15px;
        text-align: center;
        font-size: 1.5rem;
    }
    label {
        font-weight: bold;
        display: block;
        margin-bottom: 6px;
        text-align: center;
        font-size: 1rem;
    }
    input[type="text"] {
        width: 100%;
        box-sizing: border-box;
        font-family: monospace;
        font-size: 1.8rem;
        padding: 6px;
        margin-bottom: 1px;
        border-radius: 8px;
        border: 1px solid #ccc;
        text-align: center;
        user-select:text;
    }
    /* Container baris biaya/kode unik/nominal */
    .info-row {
        margin: 10px auto 8px auto;
        max-width: 400px;
        width: 90%;
        display: flex;
        gap: 4px;
        justify-content: center;
        font-size: 0.7rem;
        flex-wrap: nowrap; /* tetap 1 baris */
    }
    .info-box {
        background: #e6f0ea;
        padding: 8px 12px;
        border-radius: 8px;
        box-shadow: 0 1px 5px rgba(0,0,0,0.1);
        color: #2d6a4f;
        font-weight: 600;
        text-align: center;
        user-select: text;
        min-width: 100px;
        flex-shrink: 0;
    }
    .info-box.biaya {
        background: #d7e8d5;
        color: #1b3a2a;
        font-size: 0.7rem;
        flex-basis: 40%;
    }
    .info-box.kode-unik {
        background: #f0f7f0;
        color: #4a7f4a;
        font-size: 0.7rem;
        flex-basis: 40%;
        margin-bottom: 0px;

    }
    .info-box.nominal-final {
        background: #bad5bb;
        color: #155214;
        margin-top: 0px;
        font-size: 1rem;
        font-weight: 500;
        flex-basis: 60%;
        
    }
    .error {
        color: #b00020;
        font-weight: bold;
        margin-bottom: 1px;
        text-align: center;
        font-size: 1rem;
    }
    .qr-code {
        margin-top: 1px;
        text-align: center;
        width: 90%;
        max-width: 400px;
        user-select:none;
    }
    .qr-code h3 {
          margin-top: 1px;
          font-size: 1.2rem;
        margin-bottom: 10px;
    }
    .qr-code img {
        width: 60%;
        height: auto;
        max-width: 400px;
        border-radius: 10px;
        box-shadow: 0 0 10px rgba(0,0,0,0.15);
        user-select:none;
    }
    .btns {
        margin-top: 10px;
        display: flex;
        justify-content: center;
        gap: 10px;
        flex-wrap: wrap;
    }
    button {
        cursor: pointer;
        padding: 10px 15px;
        font-size: 1rem;
        border-radius: 6px;
        border: none;
        background: #2d6a4f;
        color: white;
        transition: background 0.3s ease;
        user-select:none;
    }
    button:hover {
        background: #1b3a2a;
    }
    footer {
        position: fixed;
        bottom: 0;
        width: 100%;
        background: #2d6a4f;
        color: #d7e8d5;
        text-align: center;
        padding: 8px 0;
        font-size: 0.9rem;
        font-weight: 600;
        font-family: Arial, sans-serif;
        user-select: none;
        box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    }
    @media (max-width: 480px) {
        body {
            padding: 15px 10px 60px;
        }
        form {
            padding: 15px;
        }
        h2 {
            font-size: 1.25rem;
        }
        label, input[type="text"], .error {
            font-size: 0.9rem;
        }
        .qr-code h3 {
            font-size: 1rem;
        }
        .info-row {
            flex-direction: column;
            gap: 10px;
            max-width: 100%;
            flex-wrap: wrap;
        }
        .info-box.biaya,
        .info-box.kode-unik,
        .info-box.nominal-final {
            flex-basis: 100%;
        }
    }