body{font-family:Arial;background:#f4f6ff;text-align:center}
.header{background:linear-gradient(120deg,#5f2cff,#00c6ff);color:#fff;padding:20px}
.container{background:#fff;margin:40px auto;padding:40px;border-radius:15px;width:90%;max-width:500px;box-shadow:0 10px 30px rgba(0,0,0,.1)}
input{width:100%;padding:15px;margin:10px 0;border-radius:10px;border:1px solid #ddd}
button{background:#5f2cff;color:#fff;border:none;padding:12px 25px;border-radius:8px;cursor:pointer;margin-top:15px}
.result{margin-top:25px;font-size:22px;font-weight:bold}