:root{font-family:Inter,system-ui,sans-serif;background-color:#f8fafc;color:#0f172a}main{max-width:720px;margin:4rem auto;padding:2rem;background:#fff;border-radius:1rem;box-shadow:0 10px 30px #0f172a1f}h1{margin-bottom:.5rem}section{margin-top:1.5rem;padding:1rem;border-left:4px solid #2563eb;background:#eff6ff}