:root {
  --text: #24292f;
  --muted: #6b7280;
  --accent: #0f766e;
  --border: #e5e7eb;
  --code-bg: #f6f8fa;
  --max-width: 46rem;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.75;
  font-size: 17px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* 页头 */
.site-header { border-bottom: 1px solid var(--border); padding: 1rem 0; }
.header-inner { display: flex; align-items: center; justify-content: space-between; }
.site-title { font-size: 1.3rem; font-weight: 700; color: var(--text); text-decoration: none; }
.site-nav a { margin-left: 1rem; color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--accent); }

/* 主体 */
main.container { padding-top: 2rem; padding-bottom: 3rem; }

/* 文章列表 */
.post-item { padding: 1.5rem 0; border-bottom: 1px solid var(--border); }
.post-title { margin: 0 0 0.25rem; line-height: 1.3; }
.post-title a { color: var(--text); text-decoration: none; }
.post-title a:hover { color: var(--accent); }
.post-meta { color: var(--muted); font-size: 0.9rem; margin-bottom: 1rem; }
.post-summary { color: #374151; }

/* 文章正文 */
.post-content { font-size: 1.05rem; }
.post-content h2, .post-content h3 { line-height: 1.4; margin-top: 2rem; }
.post-content a { color: var(--accent); }

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
  margin: 1.5rem auto;
}

.post-content code {
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}
.post-content pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
}
.post-content pre code { background: none; padding: 0; }

.post-content blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 1rem;
  border-left: 4px solid var(--accent);
  color: var(--muted);
  background: var(--code-bg);
}

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); padding: 1.5rem 0; color: var(--muted); font-size: 0.9rem; }

@media (max-width: 640px) {
  body { font-size: 16px; }
}