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

body {
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  color: #2c2c2c;
  background: #fdfdfc;
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  font-size: 16px;
}

header { margin-bottom: 40px; }

header h1 {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 1px;
}

header h1 a { color: #1a1a1a; text-decoration: none; }

.sub {
  color: #8a8a8a;
  font-size: 14px;
  margin-top: 6px;
}

.intro {
  color: #555;
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid #ececec;
}

.posts { list-style: none; }

.posts li {
  margin-bottom: 30px;
  padding-bottom: 24px;
  border-bottom: 1px solid #f2f2f2;
}

.posts li:last-child { border-bottom: none; }

.posts a {
  color: #1a1a1a;
  text-decoration: none;
  font-size: 18px;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}

.posts a:hover { border-bottom-color: #1a1a1a; }

.date {
  color: #aaa;
  font-size: 13px;
  margin-left: 10px;
}

.posts p {
  color: #666;
  font-size: 14px;
  margin-top: 8px;
}

article h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
}

article .meta {
  color: #aaa;
  font-size: 13px;
  margin-bottom: 28px;
}

article p { margin-bottom: 18px; color: #333; }

article h3 {
  font-size: 17px;
  margin: 28px 0 12px;
  font-weight: 600;
}

article code {
  background: #f4f4f2;
  padding: 2px 5px;
  border-radius: 3px;
  font-size: 14px;
  font-family: "SF Mono", Consolas, monospace;
}

article pre {
  background: #f7f7f5;
  padding: 14px 16px;
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: 18px;
  font-size: 13.5px;
  line-height: 1.6;
}

article pre code { background: none; padding: 0; }

.back {
  display: inline-block;
  margin-top: 36px;
  color: #8a8a8a;
  text-decoration: none;
  font-size: 14px;
}

.back:hover { color: #1a1a1a; }

footer {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid #ececec;
  color: #bbb;
  font-size: 13px;
  text-align: center;
}