:root{--bg:#f3fafc;--head:#cdeff7;--card:#fff;--text:#0b3a4a;--muted:#5b6b73;--accent:#0b8fae;--navy:#0b4a5e;--line:#e3ecef}
@media (prefers-color-scheme:dark){:root{--bg:#0c171b;--head:#123039;--card:#152228;--text:#e6f4f8;--muted:#9fb2b9;--accent:#5fd3ee;--navy:#0a3644;--line:#24363d}}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text)}
header{background:var(--head);padding:20px 16px}header a{color:var(--text);text-decoration:none;font-weight:800;display:flex;align-items:center;gap:10px}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}main .wrap{padding:24px 16px 48px}
h1{font-size:30px;line-height:1.2;margin:8px 0}h2{font-size:20px;margin:28px 0 8px}a{color:var(--accent)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;margin:14px 0}
.hero{background:var(--navy);color:#fff;border-radius:20px;padding:24px;margin:16px 0}.hero h1{color:#fff}
.btn{display:inline-block;background:#22b8d8;color:#fff;font-weight:700;padding:12px 20px;border-radius:12px;text-decoration:none}
ul{padding-left:20px}footer{color:var(--muted);font-size:14px;padding:24px 16px;border-top:1px solid var(--line)}
.muted{color:var(--muted)}