:root{color-scheme:dark;font-family:system-ui,Meiryo,sans-serif;background:#101621;color:#edf2fa;font-size:16px}body{margin:0;line-height:1.85}main{max-width:760px;margin:3rem auto;padding:0 1.3rem}h1{font-size:1.8rem}h2{font-size:1.2rem;margin-top:2rem}a{color:#7edecf}p{color:#c7d3e4}a:focus-visible{outline:2px solid #7edecf;outline-offset:4px}