body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 20px;
  background: #f5f7fa;
  color: #333;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #444;
}

.container {
  max-width: 500px;
  margin: auto;
  padding: 20px;
  background: white;
  border-radius: 16px;
  box-shadow: 0 0 20px rgba(0,0,0,0.05);
}

input[type="file"],
button {
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  border: none;
  border-radius: 8px;
  background: #0066cc;
  color: white;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  background: #004999;
}

img, canvas {
  display: block;
  margin: 20px auto;
  max-width: 100%;
}