* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f4f5;
  color: #18181b;
}

.container {
  max-width: 900px;
  margin: 50px auto;
  padding: 30px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

h1 {
  margin-bottom: 5px;
}

.subtitle {
  color: #666;
  margin-bottom: 30px;
}

label {
  display: block;
  margin-top: 20px;
  margin-bottom: 8px;
  font-weight: bold;
}

textarea {
  width: 100%;
  height: 250px;
  padding: 15px;
  font-family: monospace;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 8px;
  resize: vertical;
}

input {
  width: 100%;
  padding: 14px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 15px;
}

button {
  margin-top: 20px;
  padding: 14px 25px;
  border: none;
  border-radius: 8px;
  background: #18181b;
  color: white;
  font-size: 15px;
  cursor: pointer;
}

button:hover {
  opacity: 0.85;
}

.result {
  margin-top: 30px;
}

pre {
  background: #f4f4f5;
  padding: 20px;
  border-radius: 8px;
  white-space: pre-wrap;
  word-wrap: break-word;
  min-height: 100px;
}