@font-face { font-family: "Source Serif 4"; font-weight: 400; font-style: normal; font-display: swap; src: url(/fonts/SourceSerif4-400.ttf) format("truetype"); }
@font-face { font-family: "Source Serif 4"; font-weight: 400; font-style: italic; font-display: swap; src: url(/fonts/SourceSerif4-400i.ttf) format("truetype"); }
@font-face { font-family: "Source Serif 4"; font-weight: 600; font-display: swap; src: url(/fonts/SourceSerif4-600.ttf) format("truetype"); }
@font-face { font-family: "Source Serif 4"; font-weight: 700; font-display: swap; src: url(/fonts/SourceSerif4-700.ttf) format("truetype"); }
@font-face { font-family: Inter; font-weight: 400; font-display: swap; src: url(/fonts/Inter-400.ttf) format("truetype"); }
@font-face { font-family: Inter; font-weight: 600; font-display: swap; src: url(/fonts/Inter-600.ttf) format("truetype"); }
@font-face { font-family: "JetBrains Mono"; font-weight: 400; font-display: swap; src: url(/fonts/JetBrainsMono-400.ttf) format("truetype"); }

:root { --ink: #12382f; --accent: #1d6b58; --gold: #e7b84a; --text: #1f2523; --muted: #5d6a66;
  --line: #d9e2df; --tint: #f3f6f5; --paper: #fdfcf9; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--text); font: 18px/1.65 "Source Serif 4", Georgia, serif; }
a { color: var(--accent); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 720px; }
h1, h2, h3 { color: var(--ink); line-height: 1.2; }
h2 { font: 600 1.5rem/1.25 Inter, system-ui, sans-serif; margin: 0 0 16px; }
h3 { font: 600 1.05rem/1.3 Inter, system-ui, sans-serif; margin: 28px 0 10px; }
section { padding: 56px 0; }
.band { background: var(--tint); }
.muted { color: var(--muted); }
.eyebrow { font: 600 0.75rem/1 Inter, sans-serif; letter-spacing: 0.25em; text-transform: uppercase; color: var(--accent); margin: 0 0 14px; }

.site-head { background: var(--ink); }
.site-head .wrap { display: flex; justify-content: space-between; align-items: center; height: 56px; }
.site-head a { color: #f4f1e8; text-decoration: none; font: 600 0.95rem Inter, sans-serif; }
.site-head .brand { font: 700 1.1rem "Source Serif 4", serif; }

.hero { background: var(--ink); color: #f4f1e8; padding: 64px 0 72px; }
.hero h1 { color: #f4f1e8; font-size: clamp(2.6rem, 9vw, 4.6rem); line-height: 1; margin: 0 0 22px; }
.hero h1::after { content: ""; display: block; width: 96px; height: 3px; background: var(--gold); margin-top: 22px; }
.hero .eyebrow { color: #9cc9bb; }
.hero .lede { font: 600 1.3rem/1.35 Inter, sans-serif; margin: 0 0 10px; }
.hero .sub { color: #c9dcd5; font-style: italic; max-width: 560px; margin: 0 0 28px; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn { display: inline-block; padding: 13px 22px; border-radius: 6px; font: 600 1rem/1.2 Inter, sans-serif; text-decoration: none; }
.btn-buy { background: var(--gold); color: #1d1a10; }
.btn-buy:hover { background: #f0c75e; }
.btn-buy.is-soon { background: #cfd6d3; color: #4b5552; cursor: default; }
.btn-ghost { border: 1.5px solid currentColor; color: inherit; }
.hero .btn-ghost { color: #f4f1e8; }

.ticks { list-style: none; padding: 0; margin: 0 0 16px; }
.ticks li { padding-left: 28px; position: relative; margin: 0 0 10px; }
.ticks li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

.toc { list-style: none; padding: 0; margin: 0; }
.toc-part { margin: 0 0 18px; font: 600 1rem Inter, sans-serif; color: var(--ink); }
.part-label { display: block; font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.toc-part ol { list-style: none; padding: 0; margin: 0; }
.toc-ch, .toc-ap { font: 400 1.05rem/1.45 "Source Serif 4", serif; color: var(--text); padding: 7px 0; border-bottom: 1px solid var(--line); display: flex; gap: 12px; }
.toc .n { font: 600 0.85rem/1.9 Inter, sans-serif; color: var(--muted); min-width: 1.6em; }

.faq dt { font: 600 1.02rem Inter, sans-serif; color: var(--ink); margin-top: 18px; }
.faq dd { margin: 6px 0 0; }
.closing { text-align: center; }
.closing .cta { justify-content: center; }

.chapter { padding: 48px 0 64px; }
.chapter h1 { font-size: clamp(1.9rem, 6vw, 2.6rem); margin: 0 0 28px; }
.prose h2 { margin-top: 36px; }
.prose blockquote { margin: 18px 0; padding: 10px 16px; background: var(--tint); border-left: 3px solid var(--accent); }
.prose code { font: 0.85em "JetBrains Mono", monospace; background: var(--tint); padding: 1px 4px; border-radius: 3px; }
.prose pre { background: #f6f8f7; border: 1px solid var(--line); padding: 12px 14px; border-radius: 4px; overflow-x: auto; font-size: 0.8rem; }
.prose pre code { background: none; padding: 0; }
.prose table { display: block; overflow-x: auto; border-collapse: collapse; font: 0.9rem/1.45 Inter, sans-serif; margin: 16px 0; }
.prose th { text-align: left; border-bottom: 1.5px solid var(--ink); padding: 6px 10px; }
.prose td { border-bottom: 1px solid var(--line); padding: 6px 10px; vertical-align: top; }
.prose img { max-width: 100%; }
.prose { overflow-wrap: anywhere; }
.buy-panel { margin-top: 48px; padding: 28px; background: var(--ink); color: #f4f1e8; border-radius: 8px; }
.buy-panel h2 { color: #f4f1e8; }
article.prose { padding-top: 48px; padding-bottom: 64px; }

.site-foot { border-top: 1px solid var(--line); padding: 28px 0; font: 0.88rem/1.6 Inter, sans-serif; color: var(--muted); }
.site-foot p { margin: 4px 0; }
.site-foot a { color: var(--muted); }