:root{
  --bg:#ffffff; --fg:#1a1f2b; --muted:#5b6472; --line:#e6e9ef;
  --brand:#2f6df0; --brand-dark:#1f52c4; --accent:#0fb98a; --card:#f7f9fc;
  --maxw:720px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--fg);
  font:17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:800;font-size:22px;color:var(--fg);letter-spacing:-.02em}
.logo span{color:var(--brand)}
nav a{color:var(--muted);font-size:15px;margin-left:20px}
.hero{padding:56px 0 40px;text-align:center}
.hero h1{font-size:38px;line-height:1.15;letter-spacing:-.02em;margin:0 0 14px}
.hero p{font-size:19px;color:var(--muted);max-width:560px;margin:0 auto 26px}
.btn{display:inline-block;background:var(--brand);color:#fff;font-weight:600;
  padding:13px 26px;border-radius:10px;font-size:16px}
.btn:hover{background:var(--brand-dark);text-decoration:none}
h2{font-size:26px;letter-spacing:-.01em;margin:40px 0 12px}
h3{font-size:20px;margin:28px 0 8px}
.lead{font-size:19px;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 22px;margin:14px 0}
.posts{list-style:none;padding:0;margin:16px 0}
.posts li{padding:16px 0;border-bottom:1px solid var(--line)}
.posts a{font-weight:600;font-size:18px}
.posts .ex{color:var(--muted);font-size:15px;margin-top:4px}
article{padding:16px 0 40px}
article h1{font-size:32px;line-height:1.2;letter-spacing:-.02em;margin:8px 0 6px}
article .meta{color:var(--muted);font-size:14px;margin-bottom:8px}
article .tldr{background:var(--card);border-left:4px solid var(--accent);
  border-radius:8px;padding:14px 18px;margin:18px 0}
article p,article li{font-size:17px}
article ul,article ol{padding-left:22px}
.faq dt{font-weight:600;margin-top:16px}
.faq dd{margin:4px 0 0}
footer.site{border-top:1px solid var(--line);margin-top:48px;padding:28px 0;color:var(--muted);font-size:14px}
footer.site a{color:var(--muted)}
@media(max-width:600px){.hero h1{font-size:30px}.hero{padding:36px 0 28px}article h1{font-size:26px}}