*{box-sizing:border-box}body{margin:0;font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:#0f172a;color:#e2e8f0}
a{color:#38bdf8}header,main,footer{max-width:860px;margin:0 auto;padding:20px}
header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;border-bottom:1px solid #1e293b}
header a.brand{font-weight:700;font-size:20px;color:#f8fafc;text-decoration:none}nav a{margin-left:14px;font-size:15px}
h1{font-size:30px;line-height:1.25;color:#f8fafc}h2{margin-top:34px;color:#f8fafc;font-size:22px}
.tool{background:#111c33;border:1px solid #1e293b;border-radius:10px;padding:4px 20px 14px;margin:18px 0}
.cta{display:inline-block;background:#0284c7;color:#fff;padding:10px 18px;border-radius:8px;text-decoration:none;font-weight:600}
footer{border-top:1px solid #1e293b;font-size:14px;color:#94a3b8}footer a{margin-right:14px}
code{background:#1e293b;padding:1px 5px;border-radius:4px}
.ad-slot{display:block;min-height:250px;margin:28px auto;max-width:860px}