body { font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; max-width: 800px; margin: 0 auto; padding: 0 20px; line-height: 1.6; color: #1a1a2e; }
.site-header { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; border-bottom: 2px solid #1a1a2e; flex-wrap: wrap; }
.site-title { font-size: 1.5rem; font-weight: bold; color: #1a1a2e; text-decoration: none; }
.site-header nav a { margin-left: 16px; color: #4361ee; text-decoration: none; font-size: 0.95rem; }
.site-header nav a:hover { text-decoration: underline; }
.post-theme { display: inline-block; background: #4361ee; color: #fff; padding: 2px 10px; border-radius: 12px; font-size: 0.8rem; margin-bottom: 8px; }
.post-title { margin: 8px 0; }
.post-meta { color: #666; font-size: 0.9rem; }
.post-source { margin-top: 24px; padding-top: 12px; border-top: 1px solid #ddd; font-size: 0.9rem; color: #555; }
.site-footer { margin-top: 60px; padding: 20px 0; border-top: 1px solid #ddd; color: #888; font-size: 0.85rem; }