body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f7f7f7;
  color: #222;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 20px;
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid #ddd;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo img {
  height: 40px;
}

.main-nav a {
  margin-left: 15px;
  text-decoration: none;
  color: #333;
  font-weight: 600;
}

.main-nav a:hover {
  color: #6aa300;
}

.site-footer {
  background: #eee;
  margin-top: 40px;
  font-size: 14px;
  color: #555;
}

/* style article  */
.article { background:#fff; border:1px solid #ddd; padding:22px; border-radius:10px; }
.article-header { margin-bottom: 12px; }
.article-meta { margin: 6px 0 0; color:#666; font-size: 14px; }
.article h2 { margin-top: 18px; }
.article ul { padding-left: 20px; }
.article-footer { margin-top: 20px; }