.gst-calculator-container {
    max-width: 100%;
    width: 400px;
    margin: 20px auto;
    background: #f4f4f4;
    padding: 20px;
    border-radius: 12px;
    font-family: Arial, sans-serif;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.gst-calculator-container h2 {
    text-align: center;
    font-size: 22px;
}

.gst-calculator-container label,
.gst-calculator-container select,
.gst-calculator-container input,
.gst-calculator-container button {
    display: block;
    width: 100%;
    margin-bottom: 15px;
    font-size: 16px;
}

.gst-calculator-container input,
.gst-calculator-container select {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 6px;
}

.gst-calculator-container button {
    background-color: #00695c;
    color: #fff;
    border: none;
    padding: 10px;
    cursor: pointer;
    border-radius: 6px;
}

.gst-calculator-container button:hover {
    background-color: #004d40;
}

.gst-result p {
    margin: 6px 0;
    font-size: 16px;
}

.gst-result span {
    font-weight: bold;
}

@media (max-width: 480px) {
    .gst-calculator-container {
        padding: 15px;
        width: 90%;
    }

    .gst-calculator-container h2 {
        font-size: 20px;
    }
}