.gst-calculator-container {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 600px;
    margin: 0 auto;
    padding: 25px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid #e0e0e0;
}

.gst-calculator-title {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 25px;
    font-size: 24px;
    font-weight: 600;
    padding-bottom: 10px;
    border-bottom: 2px solid #f1f1f1;
}

.gst-calculator-form {
    margin-bottom: 20px;
}

.gst-input-group {
    margin-bottom: 18px;
}

.gst-input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
    font-size: 15px;
}

.gst-input-group input,
.gst-input-group select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 15px;
    transition: all 0.3s;
    background-color: #f9f9f9;
}

.gst-input-group input:focus,
.gst-input-group select:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
    background-color: #fff;
}

.gst-button-group {
    display: flex;
    gap: 12px;
    margin-top: 25px;
}

.gst-calculate-btn,
.gst-reset-btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.gst-calculate-btn {
    background-color: #3498db;
    color: white;
}

.gst-calculate-btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

.gst-reset-btn {
    background-color: #e74c3c;
    color: white;
}

.gst-reset-btn:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
}

.gst-results-container {
    margin-top: 25px;
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    border: 1px solid #e9ecef;
}

.gst-result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px dashed #dee2e6;
}

.gst-result-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.gst-result-label {
    font-weight: 500;
    color: #495057;
}

.gst-result-value {
    font-weight: 600;
    color: #2c3e50;
}

.gst-total .gst-result-value {
    color: #e74c3c;
}

.gst-grand-total .gst-result-value {
    color: #27ae60;
    font-size: 18px;
}

/* Responsive styles */
@media (max-width: 768px) {
    .gst-calculator-container {
        padding: 15px;
    }
    
    .gst-button-group {
        flex-direction: column;
    }
    
    .gst-calculate-btn,
    .gst-reset-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .gst-calculator-title {
        font-size: 20px;
    }
    
    .gst-input-group input,
    .gst-input-group select {
        padding: 10px 12px;
    }
}