* { box-sizing: border-box; }
body {
  margin: 0 auto;
  max-width: 880px;
  padding: 24px 16px 48px;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  color: #222;
  background: #f7f7f7;
}
header { text-align: center; margin-bottom: 24px; }
header h1 { margin: 0 0 4px; font-size: 32px; }
header h1 a { color: inherit; text-decoration: none; }
.tagline { margin: 0 0 16px; color: #666; }
nav { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
nav a, nav button {
  border: 1px solid #ddd;
  background: #fff;
  color: #333;
  border-radius: 999px;
  padding: 4px 14px;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
}
nav button.active { background: #f48120; border-color: #f48120; color: #fff; }
main { display: flex; flex-direction: column; gap: 16px; }
.card {
  display: flex;
  gap: 16px;
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}
.card .thumb { flex: 0 0 220px; }
.card .thumb img { width: 100%; height: auto; border-radius: 4px; display: block; }
.card-body { min-width: 0; }
.card-body h2 { margin: 0 0 6px; font-size: 18px; line-height: 1.5; }
.card-body h2 a { color: #222; text-decoration: none; }
.card-body h2 a:hover { color: #f48120; }
.meta { margin: 0 0 8px; color: #999; font-size: 13px; }
.excerpt { margin: 0 0 8px; color: #555; font-size: 14px; }
.more { color: #f48120; text-decoration: none; font-size: 14px; }
article { background: #fff; border-radius: 8px; padding: 24px; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08); }
article h1 { font-size: 24px; line-height: 1.5; margin: 0 0 8px; }
article time { color: #999; font-size: 13px; }
article img { max-width: 100%; height: auto; }
article pre, article code { background: #f0f0f0; border-radius: 4px; }
article pre { padding: 12px; overflow-x: auto; }
article code { padding: 2px 5px; }
article pre code { padding: 0; background: none; }
.source { color: #999; font-size: 13px; word-break: break-all; }
footer { text-align: center; color: #999; font-size: 13px; margin-top: 32px; }
@media (max-width: 640px) {
  .card { flex-direction: column; }
  .card .thumb { flex: none; }
  article { padding: 16px; }
}