:root {
  --paper: #f3efe6;
  --paper-2: #ebe4d8;
  --ink: #171513;
  --muted: #6e675f;
  --line: rgba(23, 21, 19, 0.16);
  --line-strong: rgba(23, 21, 19, 0.34);
  --accent: #7f1d2d;
  --accent-dark: #5e1420;
  --brass: #9a7844;
  --white: #fffdf8;
  --shadow: 0 14px 50px rgba(24, 18, 13, 0.08);
  --header-h: 72px;
  --sidebar-w: 286px;
  --reading: 790px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; }
a { color: inherit; }
button { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 9999;
  top: 10px;
  left: 10px;
  transform: translateY(-150%);
  padding: 10px 14px;
  background: var(--ink);
  color: var(--white);
  border-radius: 2px;
}
.skip-link:focus { transform: none; }

.site-shell { min-height: 100vh; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid var(--line);
  background: rgba(243, 239, 230, 0.94);
  backdrop-filter: blur(14px);
}
.header-inner {
  max-width: 1520px;
  height: 100%;
  margin: 0 auto;
  padding: 0 30px;
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto minmax(260px, 1fr);
  align-items: center;
  gap: 22px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  width: max-content;
}
.brand-mark {
  width: 28px;
  height: 28px;
  background: url('assets/ornament.svg') center/contain no-repeat;
}
.brand-copy { line-height: 1; }
.brand-title {
  display: block;
  font-size: 13px;
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: .07em;
  text-transform: uppercase;
}
.brand-sub {
  display: block;
  margin-top: 5px;
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: 12px;
  color: var(--muted);
}
.main-nav { display: flex; align-items: center; justify-content: center; gap: 34px; }
.nav-link, .nav-button {
  border: 0;
  background: transparent;
  padding: 8px 0;
  text-decoration: none;
  font-size: 12px;
  line-height: 1;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
  cursor: pointer;
  border-bottom: 1px solid transparent;
}
.nav-link:hover, .nav-button:hover, .nav-link.active { border-color: var(--ink); }
.header-actions { justify-self: end; display: flex; align-items: center; gap: 10px; }
.search-trigger {
  min-width: 150px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border: 1px solid var(--line-strong);
  background: transparent;
  padding: 10px 12px;
  cursor: pointer;
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .1em;
}
.search-trigger:hover { background: var(--ink); color: var(--white); }
.search-kbd { color: var(--muted); font-size: 10px; }
.search-trigger:hover .search-kbd { color: #d7d0c5; }
.mobile-menu-btn { display: none; }

/* Home */
.home-main { max-width: 1400px; margin: 0 auto; padding: 86px 42px 100px; }
.home-hero {
  position: relative;
  min-height: 370px;
  border-bottom: 1px solid var(--line-strong);
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  gap: 72px;
  align-items: end;
  padding-bottom: 56px;
  overflow: hidden;
}
.home-hero::after {
  content: "";
  position: absolute;
  right: -28px;
  bottom: 14px;
  width: 350px;
  height: 350px;
  background: url('assets/ornament.svg') center/contain no-repeat;
  opacity: .11;
  pointer-events: none;
}
.eyebrow {
  margin: 0 0 22px;
  font-size: 11px;
  line-height: 1;
  font-weight: 900;
  letter-spacing: .19em;
  text-transform: uppercase;
  color: var(--accent);
}
.display-title {
  margin: 0;
  max-width: 880px;
  font-size: clamp(58px, 8vw, 126px);
  line-height: .83;
  font-weight: 950;
  letter-spacing: -.065em;
  text-transform: uppercase;
}
.display-title .serif-word {
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-weight: 400;
  text-transform: none;
  letter-spacing: -.055em;
}
.hero-note {
  position: relative;
  z-index: 1;
  max-width: 370px;
  justify-self: end;
  padding-left: 22px;
  border-left: 2px solid var(--accent);
  color: var(--muted);
  font-size: 15px;
}
.hero-note strong { color: var(--ink); }

.continue-strip {
  display: grid;
  grid-template-columns: 150px 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.strip-label { font-size: 10px; font-weight: 900; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.continue-title { font-size: 18px; font-weight: 850; letter-spacing: -.02em; }
.continue-meta { display: block; margin-top: 2px; color: var(--muted); font-size: 13px; }
.inline-arrow {
  border: 0;
  background: none;
  cursor: pointer;
  font-weight: 900;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 10px 0;
}
.inline-arrow:hover { color: var(--accent); }

.module-index { padding-top: 66px; }
.section-heading-row { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 22px; }
.section-kicker { margin: 0; font-size: 11px; font-weight: 900; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); }
.section-title { margin: 4px 0 0; font-size: clamp(34px, 4vw, 60px); line-height: .98; font-weight: 950; letter-spacing: -.045em; }
.module-row {
  position: relative;
  display: grid;
  grid-template-columns: 84px minmax(260px, .75fr) minmax(320px, 1fr) 110px;
  gap: 24px;
  align-items: center;
  min-height: 118px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
}
.module-row:last-child { border-bottom: 1px solid var(--line); }
.module-row:hover .module-row-title { color: var(--accent); }
.module-row:hover .module-arrow { transform: translateX(5px); }
.module-number { font-family: Georgia, 'Times New Roman', serif; font-style: italic; font-size: 25px; color: var(--accent); }
.module-row-title { font-size: 23px; line-height: 1.06; font-weight: 950; letter-spacing: -.035em; text-transform: uppercase; transition: color .14s ease; }
.module-desc { max-width: 620px; color: var(--muted); font-size: 14px; line-height: 1.55; }
.module-arrow { justify-self: end; font-size: 24px; transition: transform .14s ease; }
.module-progress { margin-top: 8px; width: 110px; height: 3px; background: rgba(23,21,19,.10); }
.module-progress > span { display: block; height: 100%; background: var(--accent); }

/* Course / module overview */
.course-main, .revision-main { max-width: 1260px; margin: 0 auto; padding: 70px 42px 100px; }
.page-intro { padding: 18px 0 50px; border-bottom: 1px solid var(--line-strong); }
.page-title { margin: 0; max-width: 960px; font-size: clamp(48px, 7vw, 90px); line-height: .89; font-weight: 950; letter-spacing: -.055em; text-transform: uppercase; }
.page-lede { max-width: 720px; margin: 26px 0 0; color: var(--muted); font-size: 17px; }
.course-module { padding: 48px 0; border-bottom: 1px solid var(--line); }
.course-module-head { display: grid; grid-template-columns: 75px 1fr auto; align-items: start; gap: 20px; margin-bottom: 26px; }
.course-module-title { margin: 0; font-size: 30px; line-height: 1; font-weight: 950; letter-spacing: -.04em; text-transform: uppercase; }
.chapter-list { margin-left: 95px; border-top: 1px solid var(--line); }
.chapter-link { display: grid; grid-template-columns: 52px 1fr auto; gap: 14px; padding: 15px 0; border-bottom: 1px solid var(--line); text-decoration: none; align-items: center; }
.chapter-link:hover .chapter-name { color: var(--accent); }
.chapter-num { font-size: 10px; color: var(--muted); font-weight: 900; letter-spacing: .12em; }
.chapter-name { font-weight: 780; letter-spacing: -.015em; }
.chapter-status { font-size: 12px; color: var(--muted); }

/* Study */
.study-layout {
  min-height: calc(100vh - var(--header-h));
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
}
.study-sidebar {
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  border-right: 1px solid var(--line);
  padding: 34px 24px 28px 30px;
  background: rgba(239, 233, 222, .48);
}
.sidebar-module-number { font-family: Georgia, 'Times New Roman', serif; font-style: italic; color: var(--accent); font-size: 16px; }
.sidebar-module-title { margin: 8px 0 28px; font-size: 21px; line-height: .98; font-weight: 950; letter-spacing: -.035em; text-transform: uppercase; }
.sidebar-chapters { display: grid; gap: 3px; }
.sidebar-link {
  display: grid;
  grid-template-columns: 20px 1fr auto;
  gap: 8px;
  align-items: center;
  text-decoration: none;
  padding: 9px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.28;
  border-bottom: 1px solid transparent;
}
.sidebar-link:hover { color: var(--ink); }
.sidebar-link.active { color: var(--ink); font-weight: 850; border-color: var(--line-strong); }
.sidebar-dot { width: 5px; height: 5px; background: currentColor; border-radius: 50%; opacity: .55; }
.sidebar-status { font-size: 11px; color: var(--accent); }
.sidebar-back { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); display: inline-block; text-decoration: none; font-size: 11px; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.sidebar-back:hover { color: var(--accent); }

.study-main { min-width: 0; }
.reading-wrap { max-width: calc(var(--reading) + 180px); margin: 0 auto; padding: 62px 50px 100px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 34px; font-size: 11px; color: var(--muted); }
.breadcrumbs a { text-decoration: none; }
.breadcrumbs a:hover { color: var(--accent); }
.chapter-hero {
  position: relative;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-strong);
}
.chapter-hero::after {
  content: "";
  position: absolute;
  right: -38px;
  top: -20px;
  width: 170px;
  height: 170px;
  background: url('assets/ornament.svg') center/contain no-repeat;
  opacity: .075;
  pointer-events: none;
}
.chapter-label { margin: 0 0 14px; font-size: 10px; font-weight: 900; letter-spacing: .18em; color: var(--accent); text-transform: uppercase; }
.chapter-title { margin: 0; max-width: 780px; font-size: clamp(46px, 6.2vw, 82px); line-height: .88; font-weight: 950; letter-spacing: -.055em; text-transform: uppercase; }
.chapter-intro { max-width: 720px; margin: 26px 0 0; font-size: 19px; line-height: 1.65; color: #3d3934; }
.contents-line { display: flex; align-items: start; gap: 16px; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); }
.contents-label { flex: 0 0 auto; padding-top: 3px; font-size: 9px; font-weight: 900; letter-spacing: .16em; color: var(--muted); text-transform: uppercase; }
.contents-links { display: flex; flex-wrap: wrap; gap: 5px 14px; }
.contents-links a { text-decoration: none; font-size: 12px; font-weight: 750; border-bottom: 1px solid var(--line); }
.contents-links a:hover { color: var(--accent); border-color: var(--accent); }

.study-section { scroll-margin-top: calc(var(--header-h) + 22px); padding: 58px 0 8px; }
.section-number { margin-bottom: 12px; color: var(--accent); font-family: Georgia, 'Times New Roman', serif; font-style: italic; font-size: 17px; }
.study-section h2 { margin: 0 0 22px; max-width: 740px; font-size: clamp(31px, 4vw, 48px); line-height: 1; font-weight: 950; letter-spacing: -.04em; }
.study-section h3 { margin: 34px 0 12px; font-size: 20px; line-height: 1.18; font-weight: 900; letter-spacing: -.02em; }
.study-section p { max-width: 760px; margin: 0 0 17px; }
.study-section strong { font-weight: 850; }
.study-section ul, .study-section ol { max-width: 760px; margin: 18px 0 26px; padding-left: 24px; }
.study-section li { margin: 8px 0; padding-left: 3px; }
.study-section li::marker { color: var(--accent); font-weight: 800; }
.term {
  border-bottom: 1px dotted var(--accent);
  font-weight: 800;
  cursor: help;
}
.plain-note {
  max-width: 760px;
  margin: 24px 0;
  padding: 18px 22px 18px 24px;
  border-left: 3px solid var(--accent);
  background: rgba(255,255,255,.28);
}
.plain-note-label { display: block; margin-bottom: 7px; font-size: 9px; line-height: 1; font-weight: 950; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); }
.example-block {
  max-width: 760px;
  margin: 28px 0;
  padding: 24px 0 0 56px;
  position: relative;
  border-top: 1px solid var(--line);
}
.example-block::before {
  content: "EX";
  position: absolute;
  left: 0;
  top: 23px;
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  color: var(--accent);
  font-size: 22px;
}
.example-title { font-size: 10px; font-weight: 950; letter-spacing: .15em; text-transform: uppercase; color: var(--muted); }
.example-block p { margin-top: 8px; }
.added-note { max-width: 760px; margin: 18px 0 22px; color: var(--muted); font-size: 12px; font-style: italic; }

.visual {
  max-width: 760px;
  margin: 30px 0 34px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line-strong);
  padding: 24px 0;
}
.visual-title { margin-bottom: 18px; font-size: 10px; font-weight: 950; letter-spacing: .15em; text-transform: uppercase; }
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 0; }
.flow-step { flex: 1 1 130px; min-width: 120px; border-left: 1px solid var(--line-strong); padding: 18px 16px; }
.flow-step:first-child { border-left: 0; padding-left: 0; }
.flow-step-num { display: block; margin-bottom: 8px; font-family: Georgia, 'Times New Roman', serif; color: var(--accent); font-style: italic; }
.flow-step strong { display: block; font-size: 15px; line-height: 1.15; }
.flow-step small { display: block; margin-top: 7px; color: var(--muted); line-height: 1.35; }
.pyramid { max-width: 550px; margin: 10px auto 0; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.pyramid-row { height: 54px; display: flex; align-items: center; justify-content: center; background: var(--ink); color: var(--white); font-weight: 850; font-size: 13px; }
.pyramid-row:nth-child(1) { width: 34%; }
.pyramid-row:nth-child(2) { width: 48%; background: #2d2925; }
.pyramid-row:nth-child(3) { width: 62%; background: #443d36; }
.pyramid-row:nth-child(4) { width: 78%; background: #5c5147; }
.pyramid-row:nth-child(5) { width: 94%; background: var(--accent); }
.two-col-compare { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line-strong); }
.compare-col { padding: 22px 26px 22px 0; border-right: 1px solid var(--line); }
.compare-col + .compare-col { padding-left: 26px; padding-right: 0; border-right: 0; }
.compare-col h4 { margin: 0 0 12px; font-size: 18px; font-weight: 950; text-transform: uppercase; letter-spacing: -.02em; }
.compare-col p, .compare-col li { font-size: 14px; }
.compare-col ul { margin-bottom: 0; }

.exam-recap {
  max-width: 760px;
  margin: 40px 0 16px;
  background: var(--ink);
  color: var(--paper);
  padding: 30px 32px 28px;
  position: relative;
  overflow: hidden;
}
.exam-recap::after {
  content: "";
  position: absolute;
  width: 150px;
  height: 150px;
  right: -38px;
  bottom: -40px;
  background: url('assets/ornament.svg') center/contain no-repeat;
  filter: grayscale(1) brightness(7);
  opacity: .07;
}
.exam-recap-label { display: block; margin-bottom: 16px; color: #d9b9be; font-size: 9px; font-weight: 950; letter-spacing: .18em; text-transform: uppercase; }
.exam-recap p, .exam-recap li { color: #f5eee5; font-size: 14px; }
.exam-recap ul { margin-bottom: 0; }

.source-strip {
  max-width: 760px;
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  align-items: center;
}
.source-copy { color: var(--muted); font-size: 12px; line-height: 1.4; }
.source-copy strong { color: var(--ink); }
.source-link { text-decoration: none; font-size: 10px; line-height: 1; font-weight: 950; letter-spacing: .12em; text-transform: uppercase; border-bottom: 1px solid var(--ink); padding-bottom: 3px; }
.source-link:hover { color: var(--accent); border-color: var(--accent); }

.chapter-footer-nav { max-width: 760px; margin-top: 76px; padding-top: 26px; border-top: 1px solid var(--line-strong); display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px; align-items: center; }
.prev-next { text-decoration: none; }
.prev-next.next { text-align: right; }
.prev-next-label { display: block; color: var(--muted); font-size: 9px; font-weight: 950; letter-spacing: .14em; text-transform: uppercase; }
.prev-next-title { display: block; margin-top: 3px; font-weight: 850; font-size: 14px; }
.prev-next:hover .prev-next-title { color: var(--accent); }
.complete-btn {
  border: 1px solid var(--line-strong);
  background: transparent;
  padding: 11px 14px;
  cursor: pointer;
  font-size: 10px;
  line-height: 1;
  font-weight: 950;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.complete-btn:hover, .complete-btn.completed { background: var(--ink); color: var(--white); }

/* Revision */
.revision-picker { padding-top: 36px; }
.revision-module-row { display: grid; grid-template-columns: 70px 1fr auto; gap: 18px; align-items: center; padding: 20px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.revision-module-row:hover .revision-name { color: var(--accent); }
.revision-name { font-size: 21px; font-weight: 900; letter-spacing: -.025em; text-transform: uppercase; }
.revision-sheet { max-width: 850px; margin: 0 auto; padding: 70px 42px 100px; }
.revision-chapter { padding: 44px 0; border-bottom: 1px solid var(--line); }
.revision-chapter h2 { margin: 0 0 18px; font-size: 30px; line-height: 1; font-weight: 950; letter-spacing: -.04em; text-transform: uppercase; }
.revision-section { margin: 26px 0; }
.revision-section h3 { margin: 0 0 9px; font-size: 16px; line-height: 1.15; font-weight: 900; }
.revision-section ul { padding-left: 20px; margin: 8px 0; }
.revision-section li { margin: 4px 0; font-size: 14px; }

/* Search */
.modal-backdrop { position: fixed; inset: 0; z-index: 500; background: rgba(17, 14, 12, .52); display: flex; align-items: flex-start; justify-content: center; padding: 9vh 20px 20px; }
.search-modal { width: min(760px, 100%); max-height: 80vh; overflow: hidden; background: var(--paper); box-shadow: 0 28px 100px rgba(0,0,0,.22); border: 1px solid rgba(255,255,255,.18); display: flex; flex-direction: column; }
.search-head { border-bottom: 1px solid var(--line-strong); display: grid; grid-template-columns: 1fr auto; align-items: center; }
.search-input { width: 100%; border: 0; outline: 0; background: transparent; padding: 24px 26px; font-size: 22px; font-weight: 700; color: var(--ink); }
.search-close { border: 0; background: transparent; cursor: pointer; padding: 18px 22px; font-weight: 900; }
.search-results { overflow-y: auto; padding: 0 24px 24px; }
.search-empty { padding: 34px 2px; color: var(--muted); font-size: 14px; }
.search-result { display: grid; grid-template-columns: 1fr auto; gap: 20px; padding: 18px 2px; border-bottom: 1px solid var(--line); text-decoration: none; }
.search-result:hover .search-result-title { color: var(--accent); }
.search-result-kicker { font-size: 9px; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.search-result-title { margin-top: 4px; font-weight: 900; }
.search-result-snippet { margin-top: 5px; color: var(--muted); font-size: 12px; line-height: 1.45; }
.search-result-arrow { align-self: center; }

/* Mobile drawer */
.mobile-drawer { position: fixed; inset: var(--header-h) 0 0 0; z-index: 300; background: var(--paper); overflow-y: auto; padding: 30px 24px 60px; }
.mobile-drawer[hidden] { display: none; }
.mobile-module { border-top: 1px solid var(--line); padding: 18px 0; }
.mobile-module > a { display: flex; gap: 14px; text-decoration: none; font-size: 18px; font-weight: 900; text-transform: uppercase; letter-spacing: -.02em; }
.mobile-chapters { padding: 11px 0 0 36px; }
.mobile-chapters a { display: block; padding: 7px 0; color: var(--muted); text-decoration: none; font-size: 14px; }
.mobile-chapters a:hover { color: var(--ink); }

/* 404 */
.not-found { max-width: 800px; margin: 0 auto; padding: 120px 32px; }
.not-found h1 { font-size: 70px; line-height: .9; text-transform: uppercase; letter-spacing: -.05em; }

:focus-visible { outline: 3px solid rgba(127, 29, 45, .3); outline-offset: 4px; }

@media (max-width: 1050px) {
  :root { --sidebar-w: 235px; }
  .header-inner { grid-template-columns: 1fr auto; }
  .main-nav { display: none; }
  .home-hero { grid-template-columns: 1fr; gap: 34px; min-height: auto; }
  .hero-note { justify-self: start; }
  .module-row { grid-template-columns: 58px minmax(250px, 1fr) 1.1fr 40px; }
}

@media (max-width: 780px) {
  :root { --header-h: 64px; }
  body { font-size: 16px; }
  .header-inner { padding: 0 18px; grid-template-columns: 1fr auto; }
  .brand-sub { display: none; }
  .brand-title { font-size: 11px; }
  .brand-mark { width: 23px; height: 23px; }
  .search-trigger { min-width: auto; padding: 9px 10px; }
  .search-trigger span:first-child, .search-kbd { display: none; }
  .search-trigger::after { content: "⌕"; font-size: 18px; }
  .mobile-menu-btn { display: inline-block; border: 0; background: transparent; padding: 8px 6px; cursor: pointer; font-weight: 950; font-size: 13px; }
  .header-actions { gap: 2px; }

  .home-main, .course-main, .revision-main { padding: 54px 20px 72px; }
  .home-hero { padding-bottom: 36px; }
  .display-title { font-size: clamp(50px, 18vw, 80px); }
  .home-hero::after { width: 230px; height: 230px; right: -60px; }
  .hero-note { font-size: 14px; padding-left: 16px; }
  .continue-strip { grid-template-columns: 1fr auto; gap: 16px; }
  .strip-label { grid-column: 1 / -1; }
  .module-row { grid-template-columns: 46px 1fr 24px; min-height: 100px; gap: 12px; }
  .module-desc, .module-progress { display: none; }
  .module-row-title { font-size: 19px; }

  .course-module-head { grid-template-columns: 44px 1fr; }
  .course-module-head .module-arrow { display: none; }
  .chapter-list { margin-left: 0; }
  .chapter-link { grid-template-columns: 42px 1fr auto; }

  .study-layout { display: block; }
  .study-sidebar { display: none; }
  .reading-wrap { padding: 42px 20px 72px; }
  .chapter-title { font-size: clamp(44px, 15vw, 72px); }
  .chapter-intro { font-size: 17px; }
  .chapter-hero::after { width: 130px; height: 130px; right: -45px; }
  .contents-line { display: block; }
  .contents-label { margin-bottom: 10px; }
  .contents-links { gap: 8px 13px; }
  .study-section { padding-top: 48px; }
  .study-section h2 { font-size: 34px; }
  .example-block { padding-left: 42px; }
  .two-col-compare { grid-template-columns: 1fr; }
  .compare-col { border-right: 0; border-bottom: 1px solid var(--line); padding: 20px 0; }
  .compare-col + .compare-col { padding: 20px 0; border-bottom: 0; }
  .flow { display: block; }
  .flow-step { border-left: 0; border-top: 1px solid var(--line); padding: 14px 0; }
  .flow-step:first-child { border-top: 0; }
  .exam-recap { margin-left: -2px; margin-right: -2px; padding: 25px 22px; }
  .source-strip { grid-template-columns: 1fr; gap: 12px; }
  .chapter-footer-nav { grid-template-columns: 1fr 1fr; }
  .complete-btn { grid-column: 1 / -1; grid-row: 1; }
  .revision-sheet { padding: 48px 20px 72px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; }
}

@media print {
  .site-header, .study-sidebar, .chapter-footer-nav, .source-link { display: none !important; }
  body { background: white; color: black; font-size: 11pt; }
  .reading-wrap, .revision-sheet { max-width: none; padding: 0; }
  .chapter-hero::after, .exam-recap::after { display: none; }
  .exam-recap { background: #eee; color: black; break-inside: avoid; }
  .exam-recap p, .exam-recap li { color: black; }
  .study-section { break-inside: auto; }
}