body{margin:0;padding:0;background-color:#f3f8ff;font-family:'Poppins', sans-serif}.container{width:60%;max-width:1000px;margin:30px auto;background:#ffffff;padding:20px;border-radius:8px;box-shadow:0px 4px 12px rgba(0,0,0,0.1)}.top-header{background:#003060;color:white;font-size:22px;font-weight:600;padding:15px;text-align:center;border-radius:8px 8px 0 0;margin-bottom:5px}.header{background:#6699CC;padding:15px;text-align:center;color:white;font-size:22px;font-weight:600;border-radius:8px;margin-top:0;margin-bottom:7px}label{display:block;margin-top:10px;font-weight:600}input[type="number"],  select{width:100%;padding:8px;margin-top:5px;border:1px solid #ccc;border-radius:6px;font-size:16px}.button-container{text-align:center;margin-top:15px}.calculate-btn{display:block;margin:0 auto;width:100%;max-width:300px;padding:12px;font-size:18px;font-weight:600;color:#fff;background:#28a745;border:none;border-radius:6px;cursor:pointer;transition:background 0.3s}.calculate-btn:hover{background:#218838}.result-container{display:none;margin-top:20px;background-color:#fdfdfd;padding:15px;border-radius:6px;box-shadow:0px 4px 8px rgba(0,0,0,0.1)}.result-section{margin-top:10px}.result-table{width:100%;border-collapse:collapse;margin-top:10px}.result-table th,  .result-table td{border:1px solid #ccc;padding:10px;text-align:center;font-weight:500}.result-table th{background:#00539f;color:#fff;font-weight:600}@media (max-width:600px){.container{width:90%}.calculate-btn{font-size:16px}}