* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  background: #f5f7fb;
  margin: 0;
  padding: 0;
  display: flex;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
}

.container {
  background: #ffffff;
  padding: 24px 28px;
  width: 100%;
  max-width: 520px;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

h2 {
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 1.4rem;
  color: #222;
}

input[type="file"] {
  display: block;
  margin-bottom: 14px;
}

button {
  background: #4f46e5;
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background: #4338ca;
}

button:disabled {
  background: #a5a5a5;
  cursor: not-allowed;
}

pre {
  margin-top: 18px;
  padding: 14px;
  background: #f1f3f8;
  border-radius: 6px;
  max-height: 300px;
  overflow-y: auto;
  white-space: pre-wrap;
  font-size: 0.9rem;
  color: #111;
}