:root{color-scheme:dark}body{margin:0;background:#111215;color:#f5f5f4;font:16px/1.75 Arial,sans-serif}body[data-theme="light"]{background:#fff;color:#1d2026;color-scheme:light}main{width:min(860px,88%);margin:40px auto 60px}.back,a{color:#ff9d67;text-decoration:underline;text-underline-offset:4px}body[data-theme="light"] a{color:#9f3500;font-weight:700}header,section{border-bottom:1px solid #454951;padding:0 0 24px;margin:0 0 24px}.meta{color:#b9bcc3;font-size:.9rem}.intro{font-size:1.12rem}h1{font-size:clamp(2rem,5vw,2.7rem);line-height:1.2}h2{font-size:1.3rem;line-height:1.35}footer{display:flex;gap:18px;flex-wrap:wrap}:focus-visible{outline:3px solid #ff5a00;outline-offset:4px}