:root { --ink:#0f172a; --muted:#64748b; --accent:#0ea5e9; }
*{box-sizing:border-box} body{margin:0;font-family:system-ui,Segoe UI,Roboto,Ubuntu,Arial;color:var(--ink)}
.container{max-width:1080px;margin:0 auto;padding:1rem}
.nav{border-bottom:1px solid #e5e7eb; position:sticky; top:0; background:#fff}
.nav-inner{display:flex;justify-content:space-between;align-items:center}
.brand{text-decoration:none; font-weight:700; color:var(--ink)}
.footer{border-top:1px solid #e5e7eb;margin-top:2rem} .footer-inner{padding:1rem 0;color:var(--muted)}
.lead{font-size:1.15rem;color:var(--muted)}