/* agent-journey — Nocturne design language (gold on warm near-black) */
:root {
  --bg: #070706;
  --bg-soft: #0d0d0b;
  --panel: #121210;
  --gold: #e3b341;
  --gold-hi: #f0c76a;
  --ink: #f2efe7;
  --muted: #b4aea0;
  --faint: #7d776b;
  --hairline: rgba(255, 255, 255, .07);
  --green: #4ade80;
  --radius: 14px;
  --shadow: 0 40px 90px -40px rgba(0, 0, 0, .9);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { overflow-x: clip; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
/* film grain */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 60; pointer-events: none; opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}
/* gold scroll progress */
#progress { position: fixed; top: 0; left: 0; height: 2px; width: 0; background: var(--gold); z-index: 70; }
a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold-hi); }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 28px; }

/* hero */
.hero { padding: 120px 0 72px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; top: -200px; right: -160px; width: 640px; height: 640px; border-radius: 50%;
  background: radial-gradient(circle, rgba(227, 179, 65, .10), transparent 65%); pointer-events: none;
}
.eyebrow {
  font-family: 'JetBrains Mono', monospace; font-size: 12.5px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--gold); display: inline-flex; align-items: center; gap: 10px;
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: var(--gold); }
h1 {
  font-family: 'Instrument Serif', Georgia, serif; font-weight: 400;
  font-size: clamp(56px, 9vw, 96px); line-height: 1.02; letter-spacing: -.01em; margin: 26px 0 22px;
}
h1 em { font-style: italic; color: var(--gold); }
.hero-sub { font-size: 19px; color: var(--muted); max-width: 560px; line-height: 1.65; }
.hero-sub b { color: var(--ink); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin: 30px 0 0; }
.chip {
  font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: .06em;
  color: var(--muted); border: 1px solid var(--hairline); background: var(--panel);
  padding: 7px 16px; border-radius: 999px;
}
.hero-fig { margin-top: 56px; }
.hero-fig img { width: 100%; border-radius: var(--radius); border: 1px solid var(--hairline); box-shadow: var(--shadow); display: block; }
.hero-fig figcaption { font-family: 'JetBrains Mono', monospace; font-size: 11.5px; color: var(--faint); margin-top: 12px; letter-spacing: .04em; }

/* chapters */
.chapters { padding: 96px 0 40px; position: relative; }
.chapters h2 { font-family: 'Instrument Serif', Georgia, serif; font-weight: 400; font-size: 44px; margin-bottom: 8px; }
.chapters .lede { color: var(--muted); font-size: 16.5px; max-width: 520px; margin-bottom: 44px; }
.chap {
  position: relative; padding: 34px 0 34px 96px; border-top: 1px solid var(--hairline);
  opacity: 0; transform: translateY(22px); transition: opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1);
}
.chap.in { opacity: 1; transform: none; }
.chap:last-of-type { border-bottom: 1px solid var(--hairline); }
.chap .num {
  position: absolute; left: -8px; top: 6px; font-family: 'Instrument Serif', Georgia, serif;
  font-size: 88px; line-height: 1; color: rgba(227, 179, 65, .13); pointer-events: none; user-select: none;
}
.chap .date { font-family: 'JetBrains Mono', monospace; font-size: 11.5px; letter-spacing: .18em; text-transform: uppercase; color: var(--faint); }
.chap .status { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .1em; color: var(--green); margin-left: 10px; }
.chap h3 { font-family: 'Instrument Serif', Georgia, serif; font-weight: 400; font-size: 30px; margin: 10px 0 8px; line-height: 1.2; }
.chap h3 a { color: var(--ink); }
.chap h3 a:hover { color: var(--gold); }
.chap p { color: var(--muted); font-size: 15.5px; max-width: 600px; }
.chap h3.soon { color: var(--muted); font-style: italic; }
.chap .read {
  font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--gold); display: inline-block; margin-top: 16px; border-bottom: 1px solid rgba(227, 179, 65, .4); padding-bottom: 2px;
}
.chap .read:hover { color: var(--gold-hi); border-color: var(--gold-hi); }

/* byline */
.byline { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 22px 0 26px; font-size: 14px; color: var(--faint); font-family: 'JetBrains Mono', monospace; }
.by-author { color: var(--ink); font-weight: 500; }
.by-sep { width: 3px; height: 3px; border-radius: 50%; background: var(--gold); opacity: .7; }

/* article grid + TOC */
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 56px; padding-bottom: 40px; }
.toc-wrap { position: relative; }
.toc { position: sticky; top: 36px; border-left: 1px solid var(--hairline); padding-left: 18px; }
.toc-title { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--gold); margin-bottom: 14px; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 0; }
.toc a { display: block; color: var(--faint); font-size: 13px; line-height: 1.45; padding: 5px 0; border-left: 1px solid transparent; margin-left: -19px; padding-left: 18px; transition: color .2s; }
.toc a:hover { color: var(--ink); }
.toc a.active { color: var(--gold); border-left-color: var(--gold); }

/* code copy */
.article pre { position: relative; }
.copy-code {
  position: absolute; top: 12px; right: 12px; font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: .08em; text-transform: uppercase; color: var(--faint); background: var(--bg-soft);
  border: 1px solid var(--hairline); border-radius: 6px; padding: 5px 11px; cursor: pointer; transition: color .2s, border-color .2s;
}
.copy-code:hover { color: var(--gold); border-color: rgba(227, 179, 65, .5); }

/* table wrapper */
.table-wrapper { overflow-x: auto; margin: 20px 0; border: 1px solid var(--hairline); border-radius: var(--radius); }
.table-wrapper table { margin: 0; }

/* end actions + chapter nav */
.end-actions { display: flex; gap: 12px; margin: 48px 0 12px; }
.ghost-btn {
  font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--muted); background: var(--panel); border: 1px solid var(--hairline); border-radius: 8px;
  padding: 9px 18px; cursor: pointer; transition: color .2s, border-color .2s;
}
.ghost-btn:hover { color: var(--gold); border-color: rgba(227, 179, 65, .5); }
.nextprev { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 44px; border-top: 1px solid var(--hairline); padding-top: 26px; }
.np-block { display: flex; flex-direction: column; gap: 4px; }
.np-next { text-align: right; align-items: flex-end; }
.np-label { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--faint); }
.np-block a { font-family: 'Instrument Serif', Georgia, serif; font-size: 20px; color: var(--ink); }
.np-block a:hover { color: var(--gold); }
.np-soon { font-family: 'Instrument Serif', Georgia, serif; font-size: 20px; color: var(--faint); font-style: italic; }

/* chapter meta chips on index */
.chap-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chap-meta span { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .06em; color: var(--faint); border: 1px solid var(--hairline); border-radius: 999px; padding: 4px 12px; }


/* footer */
footer { margin-top: 110px; padding: 30px 0 48px; border-top: 1px solid var(--hairline); }
footer .row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 13.5px; color: var(--faint); }
footer .row b { color: var(--muted); font-weight: 600; }

/* article page */
.article-hero { padding: 90px 0 40px; }
.article-hero .back { font-family: 'JetBrains Mono', monospace; font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--faint); }
.article-hero .back:hover { color: var(--gold); }
.article-hero h1 { font-size: clamp(44px, 7vw, 72px); margin-top: 18px; }
.article { padding-bottom: 60px; }
.article h2 { font-family: 'Instrument Serif', Georgia, serif; font-weight: 400; font-size: 34px; margin: 56px 0 14px; color: var(--ink); }
.article h2::before { content: ""; display: block; width: 34px; height: 2px; background: var(--gold); margin-bottom: 16px; }
.article h3 { font-size: 20px; font-weight: 600; margin: 34px 0 10px; color: var(--ink); }
.article p { color: var(--muted); font-size: 16.5px; margin: 14px 0; max-width: 70ch; }
.article ul, .article ol { color: var(--muted); font-size: 16.5px; margin: 14px 0 14px 26px; max-width: 70ch; }
.article li { margin: 8px 0; }
.article strong { color: var(--ink); }
.article code {
  font-family: 'JetBrains Mono', monospace; font-size: .86em; background: var(--panel);
  border: 1px solid var(--hairline); border-radius: 5px; padding: 2px 7px; color: var(--gold);
}
.article pre {
  background: var(--panel); border: 1px solid var(--hairline); border-radius: var(--radius);
  padding: 20px 22px; overflow-x: auto; margin: 18px 0; box-shadow: var(--shadow);
}
.article pre code { background: none; border: none; padding: 0; color: var(--ink); }
.article blockquote {
  border-left: 2px solid var(--gold); padding: 4px 0 4px 22px; margin: 20px 0; color: var(--ink);
  font-family: 'Instrument Serif', Georgia, serif; font-size: 21px; font-style: italic; line-height: 1.5;
}
.article blockquote p { color: var(--ink); margin: 0; }
.article table { border-collapse: collapse; margin: 20px 0; width: 100%; font-size: 14.5px; }
.article th, .article td { border: 1px solid var(--hairline); padding: 10px 14px; text-align: left; }
.article th { font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--gold); background: var(--panel); }
.article td { color: var(--muted); }
.article hr { border: none; border-top: 1px solid var(--hairline); margin: 40px 0; }

@media (max-width: 640px) {
  .hero { padding: 84px 0 48px; }
  .chap { padding-left: 64px; }
  .chap .num { font-size: 60px; left: -2px; }
  .wrap { padding: 0 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .chap { opacity: 1; transform: none; transition: none; }
  #progress { display: none; }
}