:root{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;color:#111827;background:#f8fafc}*{box-sizing:border-box}body{margin:0}a{text-decoration:none;color:#1d4ed8}a:hover{text-decoration:underline}.app-shell{min-height:100vh}.topbar{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.5rem;border-bottom:1px solid #e2e8f0;background:#fff;gap:1rem;flex-wrap:wrap}.brand{font-weight:700}nav{display:flex;gap:.75rem}.lang-switch{display:flex;align-items:center;gap:.5rem}.content{max-width:960px;margin:0 auto;padding:1.25rem}.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin-top:1rem}.card{background:#fff;border:1px solid #e2e8f0;border-radius:10px;padding:1rem}.muted{color:#475569}