:root{color-scheme:light dark;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}*{box-sizing:border-box}body{margin:0;background:#f6f7f9;color:#19222e}main{max-width:760px;margin:auto;padding:44px 22px 80px}nav{display:flex;justify-content:space-between;gap:16px;align-items:center;flex-wrap:wrap;margin-bottom:48px}nav a{color:#345b97;text-decoration:none;font-weight:600}nav .brand{font-size:1.2rem;color:#19222e}nav .links{display:flex;gap:20px}h1{font-size:clamp(2rem,6vw,3.6rem);line-height:1.12;letter-spacing:-.045em;margin:0 0 16px}h2{font-size:1.35rem;letter-spacing:-.02em;margin:34px 0 8px}p,li{max-width:67ch}p.lead{font-size:1.18rem;color:#455364}.card{background:#fff;border:1px solid #dfe4ea;border-radius:18px;padding:24px;margin:26px 0;box-shadow:0 8px 28px #19222e0a}.button{display:inline-block;background:#2867b2;color:white!important;padding:11px 17px;border-radius:10px;text-decoration:none;font-weight:700}a{color:#225da5}small,footer{color:#5b6776}footer{border-top:1px solid #dfe4ea;padding-top:22px;margin-top:48px}@media(prefers-color-scheme:dark){body{background:#111820;color:#edf2f8}nav .brand{color:#edf2f8}nav a,a{color:#8bbcff}p.lead,small,footer{color:#a6b4c4}.card{background:#1b2631;border-color:#374451;box-shadow:none}footer{border-color:#374451}}