:root{--bg:#f5f7fb;--text:#182333;--accent:#1769aa}*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}header,main,footer{max-width:1000px;margin:auto;padding:16px}nav{display:flex;gap:16px;flex-wrap:wrap}a{color:var(--accent)}a:focus-visible{outline:3px solid #000}.hero,section,aside{background:#fff;padding:20px;margin:16px 0;border-radius:12px}.btn{display:inline-block;padding:12px 18px;background:var(--accent);color:#fff;text-decoration:none;border-radius:8px}@media(max-width:600px){body{font-size:16px}section,.hero,aside{padding:16px}}