body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  color: #222;
}

.container {
  max-width: 1200px;
  margin: 40px auto;
  padding: 25px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

h1 {
  margin-top: 0;
}

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

input {
  width: 100%;
  padding: 12px;
  font-size: 18px;
  box-sizing: border-box;
  margin-bottom: 15px;
}

button {
  padding: 10px 18px;
  font-size: 16px;
  cursor: pointer;
}

.output {
  padding: 15px;
  background: #eeeeee;
  border-radius: 8px;
  font-family: monospace;
  word-break: break-all;
  line-height: 1.6;
}

canvas {
  width: 100%;
  height: 300px;
  border: 1px solid #ccc;
  background: white;
}