* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
  color: #1a1a1a;
  background: #ffffff;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 880px;
  margin: 0 auto;
  padding: 20px 24px;
  border-bottom: 1px solid #eaeaea;
}

.logo {
  font-weight: 700;
  font-size: 20px;
  color: #1a1a1a;
  text-decoration: none;
}

nav a {
  margin-left: 20px;
  color: #555;
  text-decoration: none;
  font-size: 14px;
}

nav a:hover { color: #1a1a1a; }

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.hero {
  padding: 32px 0 24px;
  margin-bottom: 24px;
  border-bottom: 1px solid #eaeaea;
}

.hero h1 { font-size: 40px; margin-bottom: 8px; }
.tagline { font-size: 18px; color: #444; margin-bottom: 4px; }
.tagline-cn { font-size: 15px; color: #777; }

h1 { font-size: 32px; margin-bottom: 16px; }

h2 {
  font-size: 22px;
  margin-top: 36px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #eaeaea;
}

h3 { font-size: 17px; margin-top: 22px; margin-bottom: 8px; }
h4 { font-size: 15px; margin-top: 18px; margin-bottom: 6px; color: #333; }

p, li { margin-bottom: 10px; font-size: 15px; }
ul, ol { padding-left: 24px; margin-bottom: 12px; }

a { color: #0070f3; }
a:hover { text-decoration: underline; }

code {
  background: #f4f4f4;
  padding: 1px 6px;
  border-radius: 3px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 20px;
  font-size: 14px;
}

th, td {
  padding: 8px 12px;
  border: 1px solid #eaeaea;
  text-align: left;
  vertical-align: top;
}

th { background: #fafafa; font-weight: 600; }

.meta {
  color: #888;
  font-size: 13px;
  margin-bottom: 24px;
}

.lang-divider {
  margin: 56px 0 32px;
  padding-top: 32px;
  border-top: 2px solid #eaeaea;
  text-align: center;
  font-size: 13px;
  color: #888;
  letter-spacing: 1px;
}

footer {
  border-top: 1px solid #eaeaea;
  padding: 24px;
  text-align: center;
  color: #888;
  font-size: 13px;
}

footer a { color: #888; }