:root{--bg:#fafbfc;--fg:#1f2933;--muted:#6b7280;--accent:#2563eb;--border:#e5e7eb;--card:#ffffff}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.wrap{max-width:880px;margin:0 auto;padding:0 20px}.site-header{background:#fff;border-bottom:1px solid var(--border);padding:14px 0}.site-header .brand{font-weight:700;margin-right:24px;color:var(--fg);text-decoration:none}.site-header nav a{margin-right:16px;color:var(--muted);text-decoration:none;font-size:14px}.site-header nav a:hover{color:var(--accent)}.site-footer{color:var(--muted);font-size:12px;padding:32px 0}h1,h2,h3{color:var(--fg)}h1{margin-top:32px}.card{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:24px;margin:16px 0}.muted{color:var(--muted)}.tag{display:inline-block;background:#eef2ff;color:#4338ca;padding:2px 8px;border-radius:4px;font-size:12px;margin-right:6px}.bullets{padding-left:20px;line-height:1.65}.bullets li{margin-bottom:8px}a{color:var(--accent)}