body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: #f5f6f8;
  color: #1f2937;
}

.shell {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 16px;
}

.panel {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 24px;
}

h1 {
  margin: 0 0 20px;
  font-size: 22px;
}

label {
  display: block;
  margin: 14px 0;
  font-size: 14px;
}

input,
select,
textarea {
  display: block;
  width: 100%;
  box-sizing: border-box;
  margin-top: 6px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  padding: 10px;
  font-size: 14px;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

button {
  border: 0;
  border-radius: 6px;
  background: #0f766e;
  color: white;
  padding: 10px 14px;
  cursor: pointer;
  min-height: 40px;
}

button:hover {
  background: #115e59;
}

pre {
  min-height: 180px;
  margin-top: 20px;
  padding: 14px;
  background: #111827;
  color: #e5e7eb;
  border-radius: 6px;
  overflow: auto;
}