@font-face {
  font-family: "Atlas Serif";
  src: local("Iowan Old Style"), local("Songti SC"), local("STSong");
  font-display: swap;
}

:root {
  --paper: #f6f4ed;
  --paper-raised: #fbfaf6;
  --paper-soft: #efede5;
  --ink: #20231f;
  --ink-muted: #686c64;
  --ink-faint: #93978e;
  --line: rgba(32, 35, 31, 0.13);
  --line-strong: rgba(32, 35, 31, 0.24);
  --moss: #405b47;
  --moss-soft: #dce5d8;
  --acid: #cbe96b;
  --code: #20241f;
  --code-ink: #e8eadf;
  --shadow: 0 22px 70px rgba(24, 28, 22, 0.10);
  --serif: "Atlas Serif", "Iowan Old Style", "Songti SC", "STSong", serif;
  --sans: "Avenir Next", Avenir, "PingFang SC", "Hiragino Sans GB", sans-serif;
  --mono: "SFMono-Regular", "Cascadia Code", "Roboto Mono", monospace;
  --sidebar: 276px;
  --toc: 216px;
  --top: 72px;
}

:root[data-theme="dark"] {
  --paper: #171a17;
  --paper-raised: #1e221e;
  --paper-soft: #242824;
  --ink: #f0eee7;
  --ink-muted: #a9aea4;
  --ink-faint: #777e75;
  --line: rgba(240, 238, 231, 0.11);
  --line-strong: rgba(240, 238, 231, 0.21);
  --moss: #a9c5a6;
  --moss-soft: #293329;
  --acid: #d4ef79;
  --code: #101310;
  --code-ink: #e9ebe2;
  --shadow: 0 24px 72px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--top) + 28px);
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 84% -8%, color-mix(in srgb, var(--moss-soft) 70%, transparent) 0, transparent 28rem),
    var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.34;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.035'/%3E%3C/svg%3E");
  z-index: 20;
}

a { color: inherit; }
button, input { font: inherit; }
button { color: inherit; }

::selection { background: var(--acid); color: #1d221a; }

.skip-link {
  position: fixed;
  left: 16px;
  top: -60px;
  z-index: 100;
  padding: 10px 16px;
  color: #172014;
  background: var(--acid);
  border-radius: 999px;
  text-decoration: none;
  transition: top 160ms ease;
}
.skip-link:focus { top: 14px; }

.reading-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--acid);
  transform: scaleX(0);
  transform-origin: left;
  z-index: 90;
  will-change: transform;
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--top);
  display: grid;
  grid-template-columns: var(--sidebar) 1fr auto;
  align-items: center;
  padding: 0 24px 0 28px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(18px) saturate(120%);
  z-index: 50;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
  text-decoration: none;
  letter-spacing: -0.02em;
  font-weight: 650;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  font: 700 13px/1 var(--mono);
  background: var(--ink);
  color: var(--acid);
}

.brand small {
  display: block;
  color: var(--ink-faint);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  line-height: 1.1;
  text-transform: uppercase;
}

.topbar-context {
  min-width: 0;
  padding-left: 28px;
  color: var(--ink-muted);
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-actions { display: flex; align-items: center; gap: 8px; }

.icon-button,
.search-button {
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper-raised) 82%, transparent);
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.icon-button:hover,
.search-button:hover {
  border-color: var(--line-strong);
  background: var(--paper-raised);
  transform: translateY(-1px);
}

.icon-button { width: 38px; display: grid; place-items: center; }
.icon-button svg { width: 16px; height: 16px; }
.theme-moon { display: none; }
[data-current-theme="dark"] .theme-sun { display: none; }
[data-current-theme="dark"] .theme-moon { display: block; }

.search-button {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px 0 14px;
  color: var(--ink-muted);
  font-size: 13px;
  white-space: nowrap;
}
.search-button kbd {
  padding: 1px 7px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper-soft);
  color: var(--ink-muted);
  font: 10px/20px var(--mono);
}

.nav-toggle { display: none; }

.sidebar {
  position: fixed;
  inset: var(--top) auto 0 0;
  width: var(--sidebar);
  padding: 28px 20px 56px 28px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  z-index: 40;
  scrollbar-width: thin;
}

.sidebar-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin: 0 8px 30px 0;
  color: var(--ink-faint);
  font: 600 10px/1.2 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-group { margin: 0 0 25px; }
.nav-label {
  margin: 0 0 8px;
  color: var(--ink-faint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-link {
  position: relative;
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 8px;
  align-items: baseline;
  padding: 7px 10px 7px 0;
  color: var(--ink-muted);
  font-size: 13px;
  line-height: 1.35;
  text-decoration: none;
  transition: color 150ms ease, transform 150ms ease;
}
.nav-link:hover { color: var(--ink); transform: translateX(2px); }
.nav-link.is-active { color: var(--ink); font-weight: 650; }
.nav-link.is-active::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--acid);
  box-shadow: inset 0 0 0 3px var(--ink);
}
.nav-number { color: var(--ink-faint); font: 10px/1.5 var(--mono); }

.nav-backdrop { display: none; }

.page-shell {
  min-height: 100vh;
  padding: calc(var(--top) + 50px) calc(var(--toc) + 68px) 100px calc(var(--sidebar) + 72px);
}

.content-wrap { max-width: 810px; margin: 0 auto; }

.chapter-header {
  margin: 0 0 58px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}
.chapter-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 20px;
  color: var(--moss);
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
.chapter-eyebrow::before { content: ""; width: 28px; height: 1px; background: currentColor; }
.chapter-header h1 {
  max-width: 760px;
  margin: 0;
  font: 500 clamp(42px, 6vw, 70px)/1.04 var(--serif);
  letter-spacing: -0.045em;
  text-wrap: balance;
}
.chapter-deck {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--ink-muted);
  font-size: 17px;
  line-height: 1.75;
}
.chapter-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 22px;
  margin-top: 26px;
  color: var(--ink-faint);
  font: 11px/1.5 var(--mono);
}

.toc {
  position: fixed;
  top: calc(var(--top) + 45px);
  right: 28px;
  width: var(--toc);
  max-height: calc(100vh - var(--top) - 80px);
  overflow: auto;
  padding-left: 24px;
  border-left: 1px solid var(--line);
  scrollbar-width: none;
}
.toc::-webkit-scrollbar { display: none; }
.toc-label {
  margin: 0 0 13px;
  color: var(--ink-faint);
  font: 700 10px/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.toc a {
  display: block;
  padding: 5px 0;
  color: var(--ink-faint);
  font-size: 11px;
  line-height: 1.45;
  text-decoration: none;
  transition: color 150ms ease, transform 150ms ease;
}
.toc a:hover, .toc a.is-active { color: var(--ink); transform: translateX(3px); }
.toc a.is-active { font-weight: 650; }

.prose { color: var(--ink); }
.prose > :first-child { margin-top: 0; }
.prose h1 { display: none; }
.prose h2,
.prose h3,
.prose h4 {
  position: relative;
  scroll-margin-top: calc(var(--top) + 25px);
  text-wrap: balance;
}
.prose h2 {
  margin: 94px 0 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font: 520 35px/1.2 var(--serif);
  letter-spacing: -0.025em;
}
.prose h3 {
  margin: 56px 0 19px;
  font: 560 24px/1.32 var(--serif);
  letter-spacing: -0.018em;
}
.prose h4 {
  margin: 36px 0 15px;
  font-size: 16px;
  line-height: 1.45;
  letter-spacing: -0.01em;
}
.heading-anchor { text-decoration: none; }
.heading-anchor::before {
  content: "#";
  position: absolute;
  right: calc(100% + 10px);
  color: transparent;
  font: 400 14px/1 var(--mono);
  transition: color 150ms ease;
}
.prose h2:hover .heading-anchor::before,
.prose h3:hover .heading-anchor::before,
.prose h4:hover .heading-anchor::before { color: var(--ink-faint); }

.prose p { margin: 0 0 1.28em; }
.prose strong { font-weight: 680; }
.prose em { font-family: var(--serif); }
.prose a:not(.heading-anchor) {
  color: var(--moss);
  text-decoration-line: underline;
  text-decoration-color: color-mix(in srgb, var(--moss) 35%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color 150ms ease, text-decoration-color 150ms ease;
}
.prose a:not(.heading-anchor):hover { color: var(--ink); text-decoration-color: var(--ink); }

.prose ul,
.prose ol { margin: 0 0 1.6em; padding-left: 1.4em; }
.prose li { margin: 0.42em 0; padding-left: 0.28em; }
.prose li::marker { color: var(--moss); }
.prose li > ul, .prose li > ol { margin-top: 0.35em; margin-bottom: 0.5em; }

.prose blockquote {
  margin: 34px 0;
  padding: 3px 0 3px 24px;
  border-left: 2px solid var(--moss);
  color: var(--ink-muted);
  font: 500 19px/1.7 var(--serif);
}
.prose blockquote p:last-child { margin-bottom: 0; }

.prose hr { margin: 70px 0; border: 0; border-top: 1px solid var(--line); }

.prose code {
  padding: 0.14em 0.36em;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--paper-soft);
  font: 0.86em/1.4 var(--mono);
  overflow-wrap: anywhere;
}
.prose pre {
  position: relative;
  margin: 30px 0;
  padding: 23px 24px;
  overflow: auto;
  border: 1px solid color-mix(in srgb, var(--code-ink) 10%, transparent);
  border-radius: 15px;
  color: var(--code-ink);
  background: var(--code);
  box-shadow: inset 0 1px rgba(255,255,255,0.035);
  font: 12px/1.72 var(--mono);
  tab-size: 2;
}
.prose pre code { padding: 0; border: 0; color: inherit; background: transparent; font: inherit; overflow-wrap: normal; }
.copy-code {
  position: absolute;
  top: 9px;
  right: 9px;
  padding: 4px 9px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 7px;
  color: #b8beb3;
  background: rgba(0,0,0,0.22);
  font: 10px/1.5 var(--sans);
  cursor: pointer;
  opacity: 0;
  transition: opacity 150ms ease;
}
.prose pre:hover .copy-code, .copy-code:focus { opacity: 1; }

.hljs-keyword, .hljs-selector-tag, .hljs-literal { color: #d7ef92; }
.hljs-string, .hljs-regexp { color: #aed5aa; }
.hljs-title, .hljs-section, .hljs-function { color: #f3d697; }
.hljs-comment, .hljs-quote { color: #788077; font-style: italic; }
.hljs-number, .hljs-symbol, .hljs-bullet { color: #dcb3a0; }
.hljs-attr, .hljs-attribute, .hljs-variable { color: #b3cad9; }

.table-wrap { margin: 32px 0; overflow-x: auto; border: 1px solid var(--line); border-radius: 13px; }
.prose table { width: 100%; border-collapse: collapse; font-size: 13px; line-height: 1.55; }
.prose th { color: var(--ink); background: var(--paper-soft); font-weight: 680; text-align: left; }
.prose th, .prose td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose tr:last-child td { border-bottom: 0; }
.prose tr:hover td { background: color-mix(in srgb, var(--moss-soft) 35%, transparent); }

.diagram {
  margin: 38px 0;
  padding: 26px 20px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-raised);
}
.mermaid { display: flex; justify-content: center; min-width: 520px; }
.mermaid svg { max-width: 100%; height: auto; }
.mermaid .edgeLabel p { color: #20231f !important; }
:root[data-theme="dark"] .mermaid .edgeLabel p { color: #ffffff !important; }
:root[data-theme="dark"] .mermaid .edgeLabel { background-color: #343a34 !important; }

.katex-display { margin: 2em 0 !important; overflow-x: auto; overflow-y: hidden; }

.chapter-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 90px 0 0;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.pager-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 19px 20px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: color-mix(in srgb, var(--paper-raised) 55%, transparent);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}
.pager-link:last-child { text-align: right; }
.pager-link:hover { transform: translateY(-2px); border-color: var(--line-strong); background: var(--paper-raised); }
.pager-link small { color: var(--ink-faint); font: 10px/1.4 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.pager-link strong { font-size: 13px; line-height: 1.4; }

.site-footer {
  margin-top: 72px;
  color: var(--ink-faint);
  font-size: 11px;
  text-align: center;
}

.search-dialog {
  width: min(720px, calc(100vw - 32px));
  max-height: min(760px, calc(100vh - 60px));
  margin: 9vh auto 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 19px;
  color: var(--ink);
  background: var(--paper-raised);
  box-shadow: var(--shadow);
}
.search-dialog::backdrop { background: rgba(14, 18, 13, 0.43); backdrop-filter: blur(7px); }
.search-form { display: flex; align-items: center; gap: 12px; padding: 16px 18px; border-bottom: 1px solid var(--line); }
.search-form svg { width: 19px; color: var(--ink-faint); flex: 0 0 auto; }
.search-form input { width: 100%; border: 0; outline: 0; color: var(--ink); background: transparent; font-size: 17px; }
.search-form input::placeholder { color: var(--ink-faint); }
.search-close { border: 0; background: transparent; color: var(--ink-faint); cursor: pointer; font-size: 12px; }
.search-results { max-height: 610px; overflow-y: auto; padding: 8px; }
.search-empty { display: grid; place-items: center; min-height: 250px; color: var(--ink-faint); text-align: center; }
.search-empty span { display: grid; place-items: center; width: 48px; height: 48px; border: 1px solid var(--line); border-radius: 50%; font: 12px/1 var(--mono); }
.search-empty p { margin-top: -60px; font-size: 13px; }
.search-result { display: block; padding: 14px 15px; border-radius: 11px; text-decoration: none; transition: background 140ms ease; }
.search-result:hover, .search-result:focus { outline: 0; background: var(--paper-soft); }
.search-result__chapter { display: block; margin-bottom: 3px; color: var(--moss); font: 9px/1.5 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.search-result strong { display: block; font: 550 17px/1.35 var(--serif); }
.search-result p { margin: 5px 0 0; color: var(--ink-muted); font-size: 12px; line-height: 1.5; }

/* Home */
.home-shell { padding-top: calc(var(--top) + 60px); }
.home-hero { max-width: 1080px; margin: 0 auto 110px; }
.home-kicker { margin: 0 0 24px; color: var(--moss); font: 700 11px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.home-title { max-width: 930px; margin: 0; font: 500 clamp(58px, 9vw, 122px)/0.88 var(--serif); letter-spacing: -0.065em; }
.home-title em { color: var(--moss); font-weight: 400; }
.home-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: end; margin-top: 58px; padding-top: 30px; border-top: 1px solid var(--line); }
.home-intro p { max-width: 560px; margin: 0; color: var(--ink-muted); font: 500 20px/1.65 var(--serif); }
.home-cta { display: flex; justify-content: flex-end; gap: 10px; }
.button-primary, .button-secondary { display: inline-flex; align-items: center; justify-content: center; min-height: 45px; padding: 0 18px; border-radius: 999px; font-size: 13px; text-decoration: none; transition: transform 160ms ease, background 160ms ease; }
.button-primary { color: #192015; background: var(--acid); }
.button-secondary { border: 1px solid var(--line-strong); background: var(--paper-raised); }
.button-primary:hover, .button-secondary:hover { transform: translateY(-2px); }

.home-metrics { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 1080px; margin: 0 auto 120px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.metric { padding: 28px 24px 30px 0; }
.metric + .metric { padding-left: 28px; border-left: 1px solid var(--line); }
.metric strong { display: block; font: 500 48px/1 var(--serif); letter-spacing: -0.04em; }
.metric span { display: block; margin-top: 9px; color: var(--ink-faint); font-size: 11px; }

.home-section { max-width: 1080px; margin: 0 auto 120px; }
.section-heading { display: grid; grid-template-columns: 240px 1fr; gap: 40px; margin-bottom: 40px; }
.section-heading small { color: var(--ink-faint); font: 700 10px/1.5 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.section-heading h2 { max-width: 680px; margin: 0; font: 500 42px/1.12 var(--serif); letter-spacing: -0.035em; }

.chapter-list { border-top: 1px solid var(--line); }
.chapter-row { display: grid; grid-template-columns: 72px 1fr minmax(240px, 0.75fr) 24px; gap: 22px; align-items: center; min-height: 94px; border-bottom: 1px solid var(--line); text-decoration: none; transition: background 180ms ease, padding 180ms ease; }
.chapter-row:hover { padding: 0 14px; background: color-mix(in srgb, var(--moss-soft) 40%, transparent); }
.chapter-row__number { color: var(--ink-faint); font: 11px/1 var(--mono); }
.chapter-row h3 { margin: 0; font: 520 24px/1.25 var(--serif); letter-spacing: -0.015em; }
.chapter-row p { margin: 0; color: var(--ink-muted); font-size: 12px; line-height: 1.5; }
.chapter-row__arrow { color: var(--moss); font-size: 18px; }

.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.principle { min-height: 230px; padding: 24px; border: 1px solid var(--line); border-radius: 15px; background: color-mix(in srgb, var(--paper-raised) 50%, transparent); }
.principle span { color: var(--moss); font: 10px/1 var(--mono); }
.principle h3 { margin: 70px 0 12px; font: 520 23px/1.2 var(--serif); }
.principle p { margin: 0; color: var(--ink-muted); font-size: 13px; }

.snapshot { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; padding: 44px; border-radius: 20px; color: #f1f2e9; background: #20241f; }
.snapshot h2 { margin: 0; font: 500 38px/1.12 var(--serif); letter-spacing: -0.03em; }
.snapshot p { margin: 0 0 18px; color: #b9bdb3; font-size: 13px; }
.snapshot a { color: var(--acid); text-underline-offset: 4px; }
.snapshot-code { align-self: end; color: #aeb5aa; font: 11px/1.85 var(--mono); }
.snapshot-code b { color: var(--acid); font-weight: 500; }

[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity 650ms ease, transform 650ms cubic-bezier(.2,.7,.2,1); }
[data-reveal].is-revealed { opacity: 1; transform: none; }

@media (max-width: 1240px) {
  :root { --toc: 0px; }
  .toc { display: none; }
  .page-shell { padding-right: 72px; }
}

@media (max-width: 980px) {
  :root { --sidebar: 0px; --top: 64px; }
  .topbar { grid-template-columns: 1fr auto; padding: 0 16px; }
  .topbar-context { display: none; }
  .brand small { display: none; }
  .nav-toggle { display: grid; }
  .search-button span { display: none; }
  .search-button kbd { display: none; }
  .search-button { width: 38px; padding: 0; justify-content: center; }
  .sidebar { width: min(326px, 88vw); padding-left: 24px; transform: translateX(-102%); box-shadow: var(--shadow); transition: transform 240ms cubic-bezier(.2,.8,.2,1); }
  body.nav-open { overflow: hidden; }
  body.nav-open .sidebar { transform: none; }
  .nav-backdrop { position: fixed; inset: var(--top) 0 0; display: block; border: 0; background: rgba(12,15,12,.36); opacity: 0; pointer-events: none; z-index: 35; transition: opacity 200ms ease; }
  body.nav-open .nav-backdrop { opacity: 1; pointer-events: auto; }
  .page-shell { padding: calc(var(--top) + 42px) 28px 80px; }
  .content-wrap { max-width: 760px; }
  .home-shell { padding-top: calc(var(--top) + 45px); }
}

@media (max-width: 720px) {
  body { font-size: 15px; }
  .page-shell { padding-left: 20px; padding-right: 20px; }
  .chapter-header { margin-bottom: 46px; }
  .chapter-header h1 { font-size: clamp(39px, 13vw, 58px); }
  .chapter-deck { font-size: 16px; }
  .prose h2 { margin-top: 72px; font-size: 30px; }
  .prose h3 { margin-top: 45px; font-size: 22px; }
  .prose a { overflow-wrap: anywhere; }
  .heading-anchor::before { display: none; }
  .prose pre { margin-left: -8px; margin-right: -8px; padding: 20px 17px; border-radius: 12px; }
  .prose blockquote { margin-left: 0; padding-left: 18px; font-size: 18px; }
  .diagram { margin-left: -8px; margin-right: -8px; padding: 18px 12px; }
  .chapter-pager { grid-template-columns: 1fr; }
  .pager-link:last-child { text-align: left; }
  .home-hero, .home-metrics, .home-section { margin-left: 20px; margin-right: 20px; }
  .home-title { font-size: clamp(58px, 19vw, 90px); }
  .home-intro { grid-template-columns: 1fr; gap: 28px; }
  .home-cta { justify-content: flex-start; flex-wrap: wrap; }
  .home-metrics { grid-template-columns: 1fr; }
  .metric { padding: 22px 0; }
  .metric + .metric { padding-left: 0; border-top: 1px solid var(--line); border-left: 0; }
  .section-heading { grid-template-columns: 1fr; gap: 12px; }
  .section-heading h2 { font-size: 34px; }
  .chapter-row { grid-template-columns: 42px 1fr 20px; gap: 10px; padding: 18px 0; }
  .chapter-row p { display: none; }
  .chapter-row h3 { font-size: 21px; }
  .principles { grid-template-columns: 1fr; }
  .principle { min-height: 190px; }
  .principle h3 { margin-top: 45px; }
  .snapshot { grid-template-columns: 1fr; gap: 34px; padding: 30px 24px; }
  .search-dialog { margin-top: 12px; max-height: calc(100vh - 24px); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

@media print {
  .topbar, .sidebar, .toc, .chapter-pager, .search-dialog, .reading-progress { display: none !important; }
  .page-shell { padding: 0; }
  body { background: white; color: black; }
  .content-wrap { max-width: none; }
  .chapter-header h1 { font-size: 42px; }
  .prose a { color: black !important; }
  .prose pre { break-inside: avoid; }
}