body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f9fbfc;
  color: #222;
  line-height: 1.7;
  text-align: center;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

.hero {
  padding: 80px 0 60px;
}

.hero h1 {
  font-size: 2rem;
  color: #0088cc;
  margin-bottom: 15px;
}

.hero p {
  color: #555;
  font-size: 1.1rem;
  margin-bottom: 30px;
}

.btn.primary {
  background: #0088cc;
  color: white;
  padding: 12px 28px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: bold;
  transition: 0.2s;
}

.btn.primary:hover {
  background: #0077b6;
}

section {
  margin-top: 60px;
}

section h2 {
  color: #111;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

ul, ol {
  text-align: left;
  max-width: 600px;
  margin: 0 auto;
  padding-left: 20px;
  color: #444;
}

.footer {
  background: #fff;
  padding: 30px 10px;
  margin-top: 60px;
  border-top: 1px solid #eee;
  font-size: 14px;
  color: #666;
}

.keywords {
  font-size: 12px;
  color: #999;
  margin-top: 5px;
}