:root{color-scheme:light dark;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:#142746;background:#f4f8ff;font-size:17px;line-height:1.75}*{box-sizing:border-box}body{margin:0}header,main,footer{max-width:850px;margin:auto;padding:24px}header{display:flex;align-items:center;gap:16px;border-bottom:1px solid #bfd4f0}header img{width:68px;height:68px;border-radius:16px}header strong{font-size:1.6rem}nav{margin-left:auto;display:flex;gap:16px;flex-wrap:wrap}a{color:#075bc7;text-underline-offset:4px}main{padding-top:40px;padding-bottom:48px}h1{font-size:clamp(1.8rem,5vw,2.5rem);line-height:1.25;margin:0 0 24px}h2{font-size:1.3rem;line-height:1.4;margin-top:36px}p{margin:12px 0}section{scroll-margin-top:20px}.intro{font-size:1.15rem}.card{background:#fff;border:1px solid #cadcf5;border-radius:22px;padding:24px;margin:24px 0}.button{display:inline-block;padding:10px 20px;background:#075bc7;color:white;border-radius:12px;text-decoration:none;overflow-wrap:anywhere}small,footer{font-size:.85rem;color:#465e7b}footer{border-top:1px solid #bfd4f0}a:focus-visible{outline:3px solid #7855c8;outline-offset:5px}@media(prefers-color-scheme:dark){:root{background:#09172d;color:#e3edff}a{color:#7dcaff}.card{background:#102540;border-color:#29466b}small,footer{color:#adbed5}header,footer{border-color:#29466b}.button{background:#1478e7;color:white}}@media(max-width:550px){header{flex-wrap:wrap}nav{margin-left:0;width:100%}main,header,footer{padding-left:20px;padding-right:20px}}