.royalty-calculator{max-width:600px;margin:0 auto;padding:20px}.royalty-calculator label{display:block;margin-top:10px}.royalty-calculator input[type="number"]{width:200px;font-size:17px;padding:15px 20px;border-radius:10px}#result,#kdpResult{margin-top:20px;font-weight:700}.result-box{background-color:#f0f8ff;border:2px solid #4682b4;border-radius:10px;padding:15px;margin-top:20px;font-size:18px}.result-box h3{margin-top:0;color:#4682b4}.result-value{font-size:24px;font-weight:700;color:#2e8b57}.hidden{display:none}