* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f3f6fb;
  color: #1f2a37;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
}

.card {
  background: #ffffff;
  border: 1px solid #dbe5f0;
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 12px;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
}

h1 {
  font-size: 22px;
  margin: 0 0 6px;
}

h2 {
  font-size: 16px;
  margin: 0 0 10px;
}

.muted {
  margin: 0;
  color: #5b6675;
  font-size: 13px;
}

.row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}

label {
  font-size: 13px;
  color: #3a4655;
}

input,
select,
button {
  border-radius: 8px;
  border: 1px solid #c8d6e5;
  padding: 10px;
  font-size: 14px;
}

button {
  background: #0f67d1;
  color: #fff;
  border: none;
}

button:disabled {
  background: #9db7dc;
}

.hint {
  margin: 8px 0 0;
  font-size: 12px;
  color: #516173;
  white-space: pre-wrap;
}

pre {
  margin: 8px 0 0;
  padding: 10px;
  border-radius: 8px;
  background: #0b1220;
  color: #d8e5ff;
  font-size: 12px;
  overflow-x: auto;
}