:root{
   --primary:#0f62fe;
   --bg:#f5f7fb;
   --card:#fff;
}
 *{box-sizing:border-box;}

body{
  margin:0;
  font-family:Arial, Helvetica, sans-serif;
  background:var(--bg);
  color:#111;
  line-height:1.5;
}
.container{
  max-width:700px;
  margin:18px auto;
  padding:16px;
  background:var(--card);
  border-radius:14px;
  box-shadow:0 4px 18px rgba(8,20,66,0.08);
}
h1{
  margin:0 0 14px;
  font-size:20px;
  font-weight:600;
}
textarea{
  width:100%;
  min-height:160px;
  padding:14px;
  border-radius:10px;
  border:1px solid #dbe4f2;
  font-size:15px;
  resize:vertical;
}
button{
  padding:8px 14px;
  border:0;
  border-radius:6px;
  background:#0a0;
  color:#fff;
  font-weight:bold;
  margin:4px;
  cursor:pointer;
}
button:hover{
  background:#0f0;
  color:#000;
}
#result{
  white-space:pre-wrap;
  background:#fff;
  border:1px solid #0f0;
  padding:10px;
  border-radius:8px;
  margin-top:10px;
  min-height:100px;
  max-height:150px;
  overflow-y:auto;
}