.gst-form-container {
    max-width: 900px;
    margin: 30px auto;
    background: #f9f9f9;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    font-family: Arial, sans-serif;
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
    font-size: 14px;
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: all 0.3s ease;
    font-family: Arial, sans-serif;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 0 0 5px rgba(76, 175, 80, 0.2);
    background-color: #fafafa;
}

.form-group input:readonly,
.form-group textarea:readonly {
    background-color: #f0f0f0;
    cursor: not-allowed;
    color: #666;
}

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

.gst-input-group input {
    flex: 1;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.gst-btn {
    padding: 12px 24px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.gst-btn:hover {
    background-color: #45a049;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.gst-btn:active {
    transform: scale(0.98);
}

.gst-btn-submit {
    width: 100%;
    margin-top: 20px;
    padding: 14px;
    font-size: 16px;
}

#gst-results h3 {
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 16px;
    color: #333;
    border-bottom: 2px solid #4CAF50;
    padding-bottom: 10px;
}

.error-message {
    color: #d32f2f;
    font-size: 13px;
    margin-top: 5px;
    display: block;
}

#loading {
    text-align: center;
    padding: 40px;
    background: #f5f5f5;
    border-radius: 4px;
}

#loading p {
    color: #666;
    font-size: 14px;
    margin: 0;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
}

textarea {
    resize: vertical;
    min-height: 100px;
}

@media (max-width: 600px) {
    .gst-form-container {
        padding: 20px;
        margin: 20px 10px;
    }

    .gst-input-group {
        flex-direction: column;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 10px;
        font-size: 16px;
    }
}