:root {
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  color: #1f2937;
  background: #f9fafb;
}

.container {
  max-width: 760px;
  margin: 64px auto;
  padding: 0 20px 40px;
}

h1 {
  margin: 0;
  font-size: 2rem;
}

.subtitle {
  margin-top: 10px;
  color: #4b5563;
}

section {
  margin-top: 28px;
  padding: 20px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid #e5e7eb;
}

h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

a {
  color: #2563eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}