:root {
  --charcoal: #111719; --paper: #fafaf9; --ink: #171d20;
  --muted: #5e676d; --line: #d3d6d7; --red: #a3212c; --red-hover: #841923;
  --font-display: 'Barlow Condensed', 'Arial Narrow', Impact, sans-serif;
  --font-text: Inter, 'Helvetica Neue', Arial, sans-serif;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font-text); font-size: 1rem; line-height: 1.65; }
h1, h2, h3, p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }
[hidden] { display: none !important; }
.shell { width: min(1260px, calc(100% - 96px)); margin-inline: auto; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid #bd753a; outline-offset: 5px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 10px 16px; background: var(--paper); transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.site-header { background: var(--charcoal); color: #fafaf8; }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 28px; }
.brand { font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; letter-spacing: 2px; line-height: 1.05; border-left: 2px solid var(--red); padding-left: 14px; }
.header-inner nav { display: flex; gap: 34px; font-size: .875rem; font-weight: 500; }
.header-inner nav a { display: flex; align-items: center; min-height: 44px; }
.header-inner nav a:hover { color: #e19a9f; }
.hero { position: relative; isolation: isolate; overflow: hidden; background: #080c0e; color: #f9f9f6; }
.hero-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center top; z-index: -3; }
.hero-shade { position: absolute; inset: 0; z-index: -2; background: linear-gradient(90deg, rgba(3,7,8,.2), transparent 60%), linear-gradient(0deg, rgba(3,7,8,.45), transparent 40%); }
.hero-copy { padding-top: clamp(120px, 11.5vw, 160px); padding-bottom: 30px; }
.eyebrow { font-size: .75rem; font-weight: 600; letter-spacing: 2.7px; line-height: 1.5; text-transform: uppercase; color: var(--red); }
.hero .eyebrow { color: #f0efeb; margin-bottom: 14px; }
.hero h1 { font-family: var(--font-display); font-weight: 800; font-size: clamp(64px, 6.3vw, 88px); line-height: .91; letter-spacing: -.8px; max-width: 600px; }
.hero h1 span { display: block; }
.hero-rule { width: 62px; height: 3px; background: var(--red); margin: 16px 0 12px; }
.hero-lead { font-size: clamp(24px, 2.1vw, 29px); line-height: 1.25; letter-spacing: -.4px; }
.hero-description { font-size: 1rem; line-height: 1.5; margin-top: 9px; max-width: 460px; color: #dedfdd; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 26px; min-height: 50px; padding: 11px 24px; font-size: 1rem; font-weight: 500; line-height: 1.5; border-radius: 2px; transition: background .15s; }
.button > span { font-size: 23px; line-height: 1; }
.button-red { background: var(--red); color: white; margin-top: 18px; }
.button-red:hover { background: var(--red-hover); }
.author { font-size: .8125rem; letter-spacing: 2px; margin-top: 16px; color: #dedfdd; }
.contents-layout { display: grid; grid-template-columns: minmax(0, 1fr) 166px; gap: 40px; align-items: start; padding-block: 38px 64px; }
.contents-section { min-width: 0; }
.section-heading { margin-bottom: 14px; }
.section-heading > .eyebrow { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.section-heading > .eyebrow::after { content: ''; flex: 1; height: 1px; background: var(--red); }
h2 { font-family: var(--font-display); font-size: clamp(40px, 4vw, 56px); font-weight: 700; letter-spacing: -.6px; line-height: 1.1; }
.contents-toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 18px; margin-top: 5px; }
.section-description { font-size: .875rem; color: var(--muted); }
.contents-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; }
.contents-controls button { display: inline-flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 44px; padding: 5px 0; border: 0; background: transparent; color: var(--red); font-size: .875rem; cursor: pointer; }
.contents-controls button:hover { text-decoration: underline; text-underline-offset: 4px; }
.contents-controls button[aria-disabled='true'] { color: var(--muted); cursor: default; text-decoration: none; }
.contents-controls button span { font-size: 1.1rem; }
.chapter-section { border-top: 1px solid var(--line); scroll-margin-top: 24px; }
.chapter-section:last-child { border-bottom: 1px solid var(--line); }
.chapter-section summary { display: grid; grid-template-columns: 38px minmax(0, 1fr) 66px 16px; gap: 18px; align-items: center; list-style: none; cursor: pointer; padding: 14px 2px; min-height: 60px; }
.chapter-section summary::-webkit-details-marker { display: none; }
.chapter-section summary::marker { content: ''; }
.chapter-section summary:hover .chapter-title { color: var(--red); }
.section-number { font-family: var(--font-display); font-size: 1.6rem; font-weight: 600; color: var(--red); line-height: 1.2; }
.chapter-label { display: block; min-width: 0; }
.chapter-title { display: block; font-family: var(--font-display); font-size: 1.625rem; line-height: 1.2; font-weight: 600; letter-spacing: -.2px; }
.chapter-description { display: none; }
.topic-count { font-size: .8125rem; line-height: 1.5; text-align: right; color: var(--muted); white-space: nowrap; }
.disclosure-icon { position: relative; width: 16px; height: 16px; color: var(--red); }
.disclosure-icon::before, .disclosure-icon::after { content: ''; position: absolute; background: currentColor; left: 1px; right: 1px; top: 7px; height: 1.5px; }
.disclosure-icon::after { transform: rotate(90deg); }
.chapter-section[open] .disclosure-icon::after { transform: none; }
.chapter-topics { list-style: none; margin: 0 0 18px 56px; padding: 0; border-left: 2px solid #b34049; }
.chapter-topics li { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; min-height: 40px; padding: 7px 19px; font-size: 1rem; line-height: 1.6; }
.chapter-topics li:nth-child(odd) { background: #f0f1f0; }
.chapter-topics .chapter-link { color: var(--red); text-decoration: underline; text-underline-offset: 4px; }
.chapter-topics .chapter-link:hover { color: var(--red-hover); }
.chapter-topics .chapter-link span { font-size: .875rem; }
.print-page { font-size: .8125rem; white-space: nowrap; color: var(--muted); font-variant-numeric: tabular-nums; }
.print-note { font-size: .75rem; color: var(--muted); margin-top: 18px; }
.resource-corner { padding-left: 23px; border-left: 1px solid var(--line); }
.resource-corner .eyebrow { letter-spacing: 2px; margin-bottom: 12px; }
.book-art { display: block; width: 68px; margin-bottom: 8px; }
.book-art img { width: 100%; height: auto; box-shadow: 2px 4px 8px #11171922; }
.resource-link { display: flex; align-items: center; gap: 6px; width: fit-content; min-height: 44px; font-size: .875rem; line-height: 1.4; text-decoration: underline; text-decoration-color: #c1c7ca; text-underline-offset: 4px; }
.resource-link:hover { color: var(--red); text-decoration-color: var(--red); }
.apps-mini { border-top: 1px solid var(--line); margin-top: 14px; padding-top: 18px; }
.apps-mini .eyebrow { margin-bottom: 0; }
.app-publisher { font-size: .75rem; color: var(--muted); margin-top: 5px; }
.app-publisher a { text-decoration: underline; text-underline-offset: 3px; }
.site-footer { background: #0b1113; color: #edf0ee; padding-block: 26px; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.site-footer .brand { font-size: 1rem; letter-spacing: 1.5px; padding-block: 5px; }
.site-footer p { font-size: .75rem; color: #b9c0c1; }
.back-top { font-size: .875rem; display: flex; gap: 15px; align-items: center; min-height: 44px; }
@media (max-width: 1050px) {
  .shell { width: calc(100% - 64px); }
  .contents-layout { gap: 28px; grid-template-columns: minmax(0, 1fr) 158px; }
  .resource-corner { padding-left: 18px; }
}
@media (max-width: 760px) {
  html { scroll-padding-top: 20px; }
  .shell { width: calc(100% - 40px); }
  .header-inner { min-height: 68px; gap: 12px; }
  .brand { font-size: 1.05rem; letter-spacing: 1.2px; padding-left: 9px; }
  .header-inner nav { gap: 15px; font-size: .875rem; }
  .hero-image { height: auto; aspect-ratio: 1586 / 992; object-fit: cover; object-position: center top; }
  .hero-shade { background: linear-gradient(0deg, #080c0e 0%, #080c0e 49%, rgba(8,12,14,.08) 80%, transparent 100%); }
  .hero-copy { padding-top: calc(53vw + 12px); padding-bottom: 30px; }
  .hero h1 { font-size: clamp(60px, 14vw, 84px); letter-spacing: -.5px; }
  .hero h1 span:first-child { font-size: .7em; line-height: 1.05; }
  .hero .eyebrow { font-size: .75rem; letter-spacing: 1.4px; }
  .hero-lead { font-size: 1.5rem; }
  .hero-description { max-width: 370px; }
  .author { letter-spacing: 1.3px; }
  .contents-layout { grid-template-columns: minmax(0, 1fr); gap: 32px; padding-block: 30px 40px; }
  h2 { font-size: 2.625rem; }
  .contents-toolbar { margin-top: 8px; gap: 2px 18px; }
  .chapter-section summary { grid-template-columns: 28px minmax(0, 1fr) 54px 14px; gap: 11px; padding: 14px 0; min-height: 60px; }
  .section-number { font-size: 1.4rem; }
  .chapter-title { font-size: 1.45rem; }
  .topic-count { font-size: .75rem; }
  .disclosure-icon { width: 14px; }
  .chapter-topics { margin-left: 39px; margin-bottom: 16px; }
  .chapter-topics li { padding: 8px 12px; gap: 12px; }
  .resource-corner { display: flex; flex-wrap: wrap; gap: 20px 42px; padding: 24px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .book-art { width: 56px; }
  .apps-mini { border: 0; padding: 0; margin: 0; }
  .apps-mini .eyebrow { margin-bottom: 8px; }
  .footer-inner { align-items: flex-start; flex-wrap: wrap; gap: 12px; }
  .site-footer p { order: 3; width: 100%; }
  .site-footer .brand { font-size: .9375rem; }
  .back-top { min-height: 32px; }
  .site-footer { padding-bottom: calc(25px + env(safe-area-inset-bottom)); }
}
@media (max-width: 360px) {
  .header-inner { flex-wrap: wrap; padding-block: 14px 4px; gap: 4px; }
  .header-inner nav { width: 100%; justify-content: space-between; }
  .chapter-section summary { grid-template-columns: 25px minmax(0, 1fr) 14px; gap: 8px; }
  .topic-count { display: none; }
  .chapter-topics { margin-left: 33px; }
}
@media print {
  .site-header, .hero, .resource-corner, .site-footer, .contents-controls { display: none !important; }
  .shell { width: 100%; }
  .contents-layout { display: block; padding: 0; }
  .chapter-section { break-inside: avoid; }
  .chapter-section summary { padding: 8px 0; min-height: 0; }
  .disclosure-icon { display: none; }
  .chapter-title { font-size: 20px; }
  .chapter-topics { margin-bottom: 10px; }
  .chapter-topics li { min-height: 0; padding-block: 2px; font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}