* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.8;
  color: #222;
  background: #fafafa;
}

header {
  background: #1a1a2e;
  color: #fff;
  padding: 48px 20px 32px;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 32px;
  letter-spacing: 4px;
}

header .sub {
  margin: 8px 0 20px;
  color: #aaa;
  font-size: 14px;
}

nav a {
  color: #8ec5ff;
  text-decoration: none;
  margin: 0 12px;
  font-size: 14px;
}

nav a:hover { text-decoration: underline; }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px;
}

article {
  background: #fff;
  border-radius: 8px;
  padding: 28px 32px;
  margin-bottom: 28px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

article h2 {
  margin: 0 0 4px;
  font-size: 22px;
}

article .meta {
  color: #999;
  font-size: 13px;
  margin: 0 0 16px;
}

article p { margin: 0 0 12px; }

footer {
  text-align: center;
  color: #999;
  font-size: 13px;
  padding: 24px 20px 40px;
}