:root{--fb-bg: #f7f8fa;--fb-fg: #1f2329;--fb-accent: #2563eb;--fb-border: #e2e5ea}*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;background:var(--fb-bg);color:var(--fb-fg)}.fb-header{display:flex;align-items:center;gap:1rem;padding:.75rem 1.5rem;background:#fff;border-bottom:1px solid var(--fb-border)}.fb-header nav{display:flex;gap:1rem;flex:1}.fb-header a{text-decoration:none;color:var(--fb-fg)}.fb-header a.router-link-active{color:var(--fb-accent);font-weight:600}.fb-main{max-width:960px;margin:0 auto;padding:1.5rem}