body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: #f5f7fb;
  color: #1f2937;
}

.container {
  max-width: 920px;
  margin: 24px auto;
  padding: 0 16px;
}

h1 {
  margin-bottom: 8px;
}

.intro {
  margin-top: 0;
  color: #4b5563;
}

.card {
  background: white;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

input,
select,
button {
  width: 100%;
  box-sizing: border-box;
  margin-top: 8px;
  margin-bottom: 8px;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
}

button {
  background: #005bbb;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background: #004999;
}

pre {
  background: #f3f4f6;
  border-radius: 8px;
  padding: 12px;
  overflow: auto;
}