body{font-family:Arial, sans-serif;background:#f4f8fc;margin:0;padding:0}.container{max-width:650px;margin:40px auto;background:white;padding:30px;border-radius:15px;box-shadow:0 0 15px rgba(0, 0, 0, 0.1)}h1{text-align:center;background-color:#0a2c58;color:white;padding:12px;font-size:22px;font-weight:600;border-radius:10px 10px 0 0;margin-top:0}h2{background-color:#6e98c9;color:white;text-align:center;font-size:22px;font-weight:600;padding:10px;border-radius:0 0 10px 10px;margin-top:0}.calculator label{display:block;margin-top:20px;font-weight:bold}.calculator input{width:100%;padding:10px;font-size:16px;margin-top:5px;border-radius:8px;border:1px solid #ccc}button{margin-top:25px;background-color:#4CAF50;color:white;padding:12px;font-size:18px;width:100%;border:none;border-radius:8px;cursor:pointer}button:hover{background-color:#3e8e41}.result{margin-top:30px;font-size:16px;line-height:1.6;background-color:#eef6ff;padding:20px;border-radius:12px}