/* article.css — two-column field-guide layout, styled to match the homepage.
   Left sticky rail (TOC + persistent CTA) + readable content column.
   Tokens mirror style.css: #050505 / gold #FFD700 / Poppins + JetBrains Mono. */
:root{
  --bg-body:#050505; --bg-panel:rgba(10,10,10,0.85); --glass:rgba(20,20,20,0.6);
  --border:rgba(255,255,255,0.08); --primary:#FFD700; --primary-hover:#e6c200;
  --text-main:#ffffff; --text-muted:#a0a0a0; --text-read:#dcdcdc;
  --font-main:'Poppins',sans-serif; --font-tech:'JetBrains Mono',monospace;
  --ease:cubic-bezier(0.2,0.8,0.2,1); --measure:72ch; --bar-h:60px;
}
*{box-sizing:border-box;margin:0;padding:0;outline:none}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background-color:var(--bg-body);color:var(--text-main);font-family:var(--font-main);
  line-height:1.75;font-size:1.05rem;overflow-x:hidden;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  background-image:radial-gradient(ellipse 70% 50% at 50% -8%,rgba(255,215,0,.045),transparent 60%)}
a{color:var(--primary);text-decoration:none;text-underline-offset:3px}
a:hover{text-decoration:underline}
::selection{background:rgba(255,215,0,.22);color:#fff}

/* ---- sticky top bar: back-left, persistent CTA-right ---- */
.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;height:var(--bar-h);
  border-bottom:1px solid #1c1c1c;padding:0 clamp(20px,5vw,40px);
  position:sticky;top:0;z-index:30;background:rgba(7,7,8,.86);backdrop-filter:blur(12px) saturate(140%)}
.topbar .back{font-family:var(--font-tech);font-size:.8rem;letter-spacing:.04em;color:var(--text-muted);display:flex;align-items:center;gap:8px;transition:color .2s var(--ease)}
.topbar .back .dot{color:var(--primary)}
.topbar .back:hover{color:#fff;text-decoration:none}
.topbar .topcta{position:relative;overflow:hidden;display:inline-flex;align-items:center;height:38px;padding:0 18px;border-radius:8px;
  font-family:var(--font-main);font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.4px;color:#1a1200;
  background:linear-gradient(135deg,#FFE873 0%,#FFD700 45%,#E5A800 100%);background-size:200% 200%;
  box-shadow:0 3px 12px rgba(255,215,0,.26),inset 0 1px 0 rgba(255,255,255,.4);transition:transform .25s var(--ease),box-shadow .25s,background-position .6s}
.topbar .topcta:hover{transform:translateY(-1px);background-position:100% 100%;text-decoration:none;box-shadow:0 6px 20px rgba(255,215,0,.45)}

/* ---- two-column shell ---- */
.layout{max-width:1180px;margin:0 auto;padding:clamp(36px,5vw,60px) clamp(20px,5vw,40px) 0;
  display:grid;grid-template-columns:232px minmax(0,1fr);gap:clamp(36px,5vw,64px);align-items:start}
.content-col{min-width:0;max-width:var(--measure)}

/* ---- left rail (sticky) ---- */
.side-rail{position:sticky;top:calc(var(--bar-h) + 28px);align-self:start;display:flex;flex-direction:column;gap:22px}
.side-rail.no-toc .toc{display:none}
.toc .toc-title{font-family:var(--font-tech);font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;color:var(--text-muted);margin-bottom:12px}
.toc ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px;border-left:1px solid #1d1d1d}
.toc li{margin:0}
.toc a{display:block;padding:6px 0 6px 14px;margin-left:-1px;border-left:2px solid transparent;font-size:.82rem;line-height:1.4;color:var(--text-muted)}
.toc a:hover{color:#fff;text-decoration:none}
.toc a.active{color:var(--primary);border-left-color:var(--primary)}
.rail-cta{font-family:var(--font-tech);font-size:.74rem;font-weight:700;letter-spacing:.04em;color:var(--primary);
  border:1px solid rgba(255,215,0,.32);border-radius:9px;padding:11px 14px;text-align:center;transition:.2s var(--ease)}
.rail-cta:hover{background:rgba(255,215,0,.08);text-decoration:none}

/* ---- article body ---- */
.article{width:100%}
.breadcrumb{font-family:var(--font-tech);font-size:.68rem;letter-spacing:.1em;color:var(--text-muted);margin-bottom:26px;text-transform:uppercase}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{margin:0 9px;opacity:.45}
.eyebrow{font-family:var(--font-tech);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--primary);margin-bottom:18px;display:inline-block;font-weight:700}
.article h1{font-size:clamp(2rem,1.4rem + 2.4vw,2.9rem);font-weight:700;line-height:1.1;letter-spacing:-.02em;color:#fff;text-wrap:balance;margin-bottom:18px}
.dek{font-size:1.2rem;line-height:1.5;color:var(--text-muted);font-weight:300;text-wrap:pretty;margin-bottom:24px}
.byline{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;font-family:var(--font-tech);font-size:.72rem;color:var(--text-muted);padding-bottom:26px;margin-bottom:38px;border-bottom:1px solid #1d1d1d}
.byline .who b{color:#fff;font-weight:500}
.byline .role{color:var(--primary)}
.byline .sep{opacity:.4}
.article h2{font-size:clamp(1.45rem,1.2rem + 1vw,1.85rem);font-weight:700;line-height:1.22;letter-spacing:-.01em;color:#fff;margin:50px 0 16px;text-wrap:balance;scroll-margin-top:calc(var(--bar-h) + 24px)}
.article h2::before{content:"";display:block;width:38px;height:3px;background:linear-gradient(135deg,#FFE873,#FFD700,#E5A800);border-radius:3px;margin-bottom:20px}
.article h3{font-size:1.18rem;font-weight:600;color:var(--primary);margin:32px 0 10px}
.article p{margin:0 0 22px;color:var(--text-read)}
.article strong{color:#fff;font-weight:600}
.article em{color:var(--text-muted);font-style:italic}
.article ul,.article ol{margin:0 0 22px;padding-left:1.35em}
.article li{margin:0 0 11px;padding-left:.35em;color:var(--text-read)}
.article li::marker{color:var(--primary)}
.article hr{border:none;border-top:1px solid #1d1d1d;margin:42px 0}
.article a{border-bottom:1px solid rgba(255,215,0,.3)}
.article a:hover{border-bottom-color:var(--primary);text-decoration:none}
.article blockquote{margin:34px 0;padding:8px 0 8px 28px;border-left:3px solid var(--primary)}
.article blockquote p{font-size:1.32rem;line-height:1.42;font-weight:300;color:#fff;letter-spacing:-.01em;text-wrap:pretty;margin:0}
.article blockquote strong{font-weight:500;color:#fff}
.article code{font-family:var(--font-tech);font-size:.84em;background:#0d0d0d;border:1px solid var(--border);padding:.12em .45em;border-radius:5px;color:var(--primary);white-space:nowrap}
.article pre{background:#0a0a0a;border:1px solid var(--border);border-radius:12px;padding:18px 20px;overflow:auto;margin:0 0 22px}
.article pre code{border:none;background:none;padding:0;color:#9ecbff;white-space:pre;font-size:.82rem}

/* ---- CTA bar / related / footer (within content column) ---- */
.cta-bar{margin:14px 0 8px;padding:24px 28px;border:1px solid var(--border);border-radius:16px;
  background:linear-gradient(180deg,rgba(255,215,0,.07),transparent 70%),var(--glass);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px}
.cta-bar .t{color:var(--text-read);font-size:1.02rem;max-width:42ch}
.cta-bar a{position:relative;overflow:hidden;display:inline-flex;align-items:center;justify-content:center;height:50px;padding:0 26px;border-radius:8px;border-bottom:none;
  font-family:var(--font-main);font-weight:600;font-size:.92rem;text-transform:uppercase;letter-spacing:.5px;color:#1a1200;
  background:linear-gradient(135deg,#FFE873 0%,#FFD700 45%,#E5A800 100%);background-size:200% 200%;
  box-shadow:0 4px 14px rgba(255,215,0,.28),inset 0 1px 0 rgba(255,255,255,.45);transition:transform .25s var(--ease),box-shadow .25s,background-position .6s;white-space:nowrap}
.cta-bar a:hover{transform:translateY(-2px);background-position:100% 100%;text-decoration:none;box-shadow:0 8px 26px rgba(255,215,0,.5)}
.related{margin:46px 0 0;padding:32px 0 0;border-top:1px solid #1d1d1d}
.related h4{font-family:var(--font-tech);font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;color:var(--text-muted);margin-bottom:16px}
.related ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.related a{display:block;padding:15px 18px;border:1px solid var(--border);border-radius:11px;background:var(--glass);font-size:.96rem;color:#fff;border-bottom:1px solid var(--border);transition:border-color .25s var(--ease),background .25s,transform .2s var(--ease)}
.related a:hover{border-color:rgba(255,215,0,.4);background:rgba(255,215,0,.04);transform:translateX(4px);text-decoration:none}
.article-footer{margin:0;padding:36px 0 84px;color:var(--text-muted);font-size:.78rem;font-family:var(--font-tech);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
.article-footer a{color:var(--text-muted)}
.article-footer a:hover{color:var(--primary)}

/* ---- responsive: single column under 980px (rail hides; topbar CTA persists) ---- */
@media(max-width:980px){
  .layout{grid-template-columns:1fr;max-width:760px}
  .side-rail{display:none}
}
@media(max-width:560px){
  body{font-size:1rem}
  .article blockquote p{font-size:1.16rem}
  .topbar .topcta{font-size:.72rem;padding:0 13px}
  .cta-bar{padding:20px 18px}
}