body {
  background: #0d1117;
  color: #fff;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background: #161b22;
  padding: 15px;
  display: flex;
  gap: 10px;
}
input[type="text"] {
  flex: 1;
  padding: 10px;
  border-radius: 5px;
  border: none;
  outline: none;
  background: #0d1117;
  color: #fff;
  font-size: 16px;
}
button {
  padding: 10px 15px;
  border-radius: 5px;
  border: none;
  background: #238636;
  color: #fff;
  cursor: pointer;
}
button:hover { background: #2ea043; }
main { padding: 20px; }
.result { border: 1px solid #30363d; margin-bottom: 15px; padding: 10px; border-radius: 5px; }