:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;color:#1f2937;background:#f3f4f6}*{box-sizing:border-box}body{margin:0}.app-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.5rem;background:#111827;color:#fff}.app-header a{color:#93c5fd;text-decoration:none}.app-main{max-width:960px;margin:2rem auto;padding:0 1rem}.card{background:#fff;border-radius:12px;padding:1.5rem;box-shadow:0 1px 3px #00000014}.card.error{border:1px solid #fecaca}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1rem;margin-top:1rem}.grid div{display:flex;flex-direction:column;gap:.25rem}.grid strong{font-size:1.5rem}.hint{margin-top:1rem;color:#6b7280;font-size:.9rem}