.gst-calculator-container{max-width:500px;margin:0 auto;padding:20px;background-color:#f9f9f9;border-radius:8px;box-shadow:0 2px 10px rgba(0,0,0,.1);font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif}.gst-calculator-container h3{color:#2c3e50;margin-top:0;margin-bottom:20px;text-align:center;font-size:1.5em}.gst-calculator-container h3 i{margin-right:10px;color:#3498db}.gst-calculator-form .form-group{margin-bottom:15px}.gst-calculator-form label{display:block;margin-bottom:5px;font-weight:600;color:#34495e}.gst-calculator-form label i{margin-right:8px;color:#7f8c8d;width:20px;text-align:center}.gst-calculator-form .form-control{width:100%;padding:10px;border:1px solid #ddd;border-radius:4px;font-size:16px;box-sizing:border-box}.btn-calculate{width:100%;padding:12px;background-color:#3498db;color:#fff;border:none;border-radius:4px;font-size:16px;font-weight:600;cursor:pointer;transition:background-color .3s}.btn-calculate:hover{background-color:#2980b9}.btn-calculate i{margin-right:8px}.gst-results{margin-top:25px;padding:15px;background-color:#fff;border-radius:4px;border-left:4px solid #3498db}.gst-results h4{margin-top:0;margin-bottom:15px;color:#2c3e50;font-size:1.2em}.gst-results h4 i{margin-right:8px;color:#27ae60}.result-item{display:flex;justify-content:space-between;margin-bottom:10px;padding-bottom:8px;border-bottom:1px dashed #eee}.result-item:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.result-label{font-weight:600;color:#7f8c8d}.result-value{font-weight:600;color:#2c3e50}.total-price{margin-top:15px;padding-top:10px;border-top:2px solid #3498db}.total-price .result-label{color:#3498db;font-size:1.1em}.total-price .result-value{color:#3498db;font-size:1.1em}