:root{--ink:#17213a;--muted:#5d6981;--line:#e2e7f0;--brand:#3c5cdb;--wash:#f5f7fc}*{box-sizing:border-box}body{margin:0;background:var(--wash);color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI",sans-serif}header,main,footer{max-width:940px;margin:auto}header{padding:28px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-weight:800}.mark{width:42px;height:42px;border-radius:12px;background:var(--brand);color:white;display:grid;place-items:center;font-size:23px}.brand small{display:block;color:#71809e;font-size:10px;letter-spacing:2px}nav{display:flex;gap:16px;flex-wrap:wrap}nav a,footer a{color:var(--brand)}main{background:white;border:1px solid var(--line);border-radius:18px;padding:50px 60px;box-shadow:0 12px 40px #2535690a}h1{font-size:42px;line-height:1.15;margin:0 0 10px}h2{margin-top:38px;font-size:23px}h3{margin-top:24px}.meta,.muted{color:var(--muted)}li{margin:8px 0}.callout{background:#eef3ff;border:1px solid #dbe4ff;padding:18px 20px;border-radius:12px}.button{display:inline-block;background:var(--brand);color:white;text-decoration:none;padding:12px 18px;border-radius:9px;font-weight:700}footer{padding:28px 24px 45px;color:var(--muted);display:flex;gap:14px;flex-wrap:wrap}@media(max-width:680px){header{align-items:flex-start;flex-direction:column}main{border-radius:0;padding:34px 22px}h1{font-size:34px}}