:root{
  --bg:#f7f8fa; --surface:#fff; --ink:#0f172a; --ink-soft:#475569; --ink-faint:#94a3b8;
  --accent:#2563eb; --accent-dk:#1e40af; --gold:#b88a1b; --line:#e2e8f0; --navy:#0f172a;
  --maxw:720px; --radius:16px; --shadow:0 10px 30px rgba(15,23,42,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:18px/1.7 "Inter","Segoe UI",system-ui,-apple-system,sans-serif}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-dk)}

header.site{position:sticky;top:0;z-index:10;background:rgba(247,248,250,.85);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.site .wrap{max-width:1080px;display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-weight:700;font-size:18px;color:var(--ink)}
.brand span{color:var(--accent)}
.back{font:600 13px/1 "Inter",system-ui,sans-serif;color:var(--accent)}

main.article{padding:3.5rem 24px 2rem}
.article .eyebrow{font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0}
.article h1{font-size:clamp(2rem,5vw,2.8rem);line-height:1.12;letter-spacing:-.02em;margin:.6rem 0 .8rem}
.article .subtitle{font-size:1.2rem;color:var(--ink-soft);margin:0 0 1rem;font-style:italic}
.article .byline{font-size:.9rem;color:var(--ink-faint);border-bottom:1px solid var(--line);padding-bottom:1.5rem;margin-bottom:2rem}

article h2{font-size:1.05rem;font-family:"Inter",system-ui,sans-serif;text-transform:uppercase;
  letter-spacing:.08em;color:var(--ink-faint);margin:2.8rem 0 1rem;font-weight:700}
article h3{font-size:1.3rem;margin:2rem 0 .8rem;letter-spacing:-.01em}
article p{margin:0 0 1.2rem}
article ul{margin:0 0 1.2rem;padding-left:1.4rem}
article li{margin:0 0 .5rem;line-height:1.65}
article strong{color:var(--ink)}
article em{color:var(--ink-soft)}
article hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}
article a{border-bottom:1px solid rgba(37,99,235,.25)}

.article-cta{margin:3.5rem 0 1rem;padding-top:2rem;border-top:1px solid var(--line);text-align:center}
.article-cta .formula-mini{color:var(--ink-soft);font-weight:600;margin-bottom:1.2rem;font-size:.95rem}
.btn{display:inline-block;padding:.6rem 1.1rem;border-radius:10px;font-weight:600;font-size:14px;
  background:var(--accent);color:#fff !important;margin:.25rem;border-bottom:none !important}
.btn:hover{background:var(--accent-dk)}
.btn-ghost{background:transparent;color:var(--ink) !important;border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent) !important}

footer{padding:3rem 0;border-top:1px solid var(--line);text-align:center;color:var(--ink-faint);font-size:14px;margin-top:2rem}

/* article hero image */
.article-hero{margin:1.5rem 0 2.5rem}
.article-hero img{width:100%;height:auto;display:block;border-radius:12px;border:1px solid var(--line);box-shadow:0 10px 30px rgba(15,23,42,.07)}
.article-hero figcaption{font-size:.85rem;color:var(--ink-faint);margin-top:.7rem;text-align:center;line-height:1.5}

/* inline article figure (in-body, shortcode) */
.article-fig{margin:2.5rem 0}
.article-fig img{width:100%;height:auto;display:block;border-radius:12px;border:1px solid var(--line);box-shadow:0 10px 30px rgba(15,23,42,.07)}
.article-fig figcaption{font-size:.85rem;color:var(--ink-faint);margin-top:.7rem;text-align:center;line-height:1.5}

/* code — inline spans and fenced blocks (ASCII diagrams, CLI output) */
article code{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  font-size:.88em;background:#eef1f6;color:var(--ink);padding:.12em .38em;border-radius:5px;
  border:1px solid var(--line)}
article pre{background:#0f172a;color:#e2e8f0;border:1px solid var(--line);border-radius:12px;
  padding:1.1rem 1.25rem;margin:2rem 0;overflow-x:auto;line-height:1.55;
  box-shadow:0 10px 30px rgba(15,23,42,.07)}
article pre code{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  font-size:.85rem;background:none;color:inherit;padding:0;border:0;border-radius:0;
  white-space:pre;display:block}