:root{--bg:#f2f4f6;--panel:#fff;--line:#d5dce3;--ink:#14202b;--ink-soft:#55636f;--brand:#2d5f8b;--brand-deep:#244d71;color:var(--ink);background:var(--bg);font-family:Segoe UI,system-ui,-apple-system,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.5}*{box-sizing:border-box}body{background:var(--bg);margin:0}.shell{min-height:100vh}.topbar{background:var(--brand-deep);color:#fff;align-items:center;gap:14px;height:56px;padding:0 20px;display:flex}.brand{font-size:17px;font-weight:600}.topbar .muted{color:#ffffffb3}.page{max-width:880px;margin:0 auto;padding:32px 20px}h1{margin:0 0 12px;font-size:28px}.lede{max-width:65ch;font-size:17px}.muted{color:var(--ink-soft)}