.gst-calculator {
    max-width: 500px;
    margin: 20px auto;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 16px;
}

.calculate-btn {
    width: 100%;
    padding: 12px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

.calculate-btn:hover {
    background: #45a049;
}

.calculator-results {
    margin-top: 25px;
}

.result-box {
    background: white;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.result-box h4 {
    margin-top: 0;
    color: #2c3e50;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}

.result-box p {
    margin: 10px 0;
    font-size: 16px;
}

.split-tax {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #eee;
}

.fas {
    margin-right: 8px;
    color: #4CAF50;
}