body {
  margin: 0;
  padding: 0;
  color: #222;
  background: #f7f8fb;
  font-family: Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 38px 22px 70px;
  background: #fff;
  box-shadow: 0 20px 60px rgba(15, 23, 42, .08);
}

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

a:hover {
  text-decoration: underline;
}

h1 {
  margin: 0 0 12px;
  font-size: 30px;
  line-height: 1.3;
}

h2 {
  margin: 42px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #e5e7eb;
  font-size: 23px;
}

.meta,
.period {
  color: #64748b;
}

.meta {
  margin-bottom: 28px;
}

.period {
  margin-top: -4px;
  font-size: 14px;
}

blockquote {
  margin: 16px 0;
  padding: 8px 16px;
  color: #475569;
  background: #f8fafc;
  border-left: 4px solid #94a3b8;
}

figure {
  margin: 26px 0;
  padding: 14px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
}

figure img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
}

figcaption {
  margin-top: 10px;
  color: #64748b;
  font-size: 13px;
  line-height: 1.55;
  text-align: center;
}

.figure_grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 26px 0;
}

.figure_grid figure {
  margin: 0;
}

.post_nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 42px;
  padding-top: 18px;
  border-top: 1px solid #e5e7eb;
}

.post_nav a {
  display: block;
  padding: 12px 14px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
}

.post_nav .wide {
  grid-column: 1 / -1;
}

@media (max-width: 720px) {
  main {
    padding: 28px 16px 54px;
  }

  h1 {
    font-size: 25px;
  }

  .figure_grid,
  .post_nav {
    grid-template-columns: 1fr;
  }

  .post_nav .wide {
    grid-column: auto;
  }
}