/*
 * ACE HTML Course — Universal Frontend Styles
 * Architecture fix: all chapters use this single static stylesheet.
 * Chapter 2 is the canonical course design system for Chapters 2+.
 * Chapter 1 extensions are retained here only for backward compatibility.
 */

/* ===== SHARED / FROZEN DESIGN SYSTEM ===== */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,400;9..40,500;9..40,600;9..40,700&family=Source+Serif+4:opsz,wght@8..60,500;8..60,600;8..60,700&display=swap');

:root {
  --paper: #f7f4ed;
  --paper-2: #eee9de;
  --ink: #132643;
  --text: #273547;
  --muted: #687386;
  --orange: #f45d22;
  --orange-deep: #d84813;
  --white: #fffdf8;
  --line: rgba(19, 38, 67, .14);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "DM Sans", "Segoe UI", Arial, sans-serif;
  --header-h: 68px;
  --content: min(1220px, calc(100vw - 128px));
  --radius: 18px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--text); font-family: var(--sans); font-kerning: normal; margin: 0; overflow-x: hidden; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
h1, h2, h3, blockquote { font-kerning: normal; font-optical-sizing: auto; text-wrap: balance; }

/* Media is intentionally unframed. These rules override theme and CMS defaults. */
img {
  background: transparent !important;
  border: 0 !important;
  border-radius: 16px;
  box-shadow: none !important;
  display: block;
  height: auto;
  max-width: 100%;
  outline: 0 !important;
  padding: 0 !important;
}
.bare-media { background: transparent; border: 0; box-shadow: none; margin: 0; padding: 0; }
.bare-media::before, .bare-media::after { content: none !important; }

:focus-visible { outline: 3px solid rgba(244, 93, 34, .45); outline-offset: 4px; }
::selection { background: rgba(244, 93, 34, .24); color: var(--ink); }

.wordmark { color: var(--ink); font-size: 13px; font-weight: 750; letter-spacing: .08em; text-decoration: none; text-transform: uppercase; white-space: nowrap; }
.course-header {
  align-items: center;
  backdrop-filter: blur(18px);
  background: rgba(247, 244, 237, .92);
  border-bottom: 1px solid rgba(19, 38, 67, .1);
  display: grid;
  gap: 22px;
  grid-template-columns: auto 1fr auto;
  height: var(--header-h);
  left: 0;
  padding: 8px 92px 8px max(24px, calc((100vw - 1380px) / 2));
  position: fixed;
  right: 0;
  top: 0;
  z-index: 80;
}
.header-context { border-left: 1px solid var(--line); display: flex; flex-direction: column; min-width: 0; padding-left: 22px; }
.header-context span { color: var(--muted); font-size: 9px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.header-context strong { color: var(--ink); font-family: var(--serif); font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.header-progress { align-items: center; display: flex; gap: 10px; }
.header-progress > span { background: rgba(19, 38, 67, .11); border-radius: 999px; height: 4px; overflow: hidden; width: 138px; }
.header-progress i { background: var(--orange); display: block; height: 100%; transform-origin: left; transition: width .35s ease; width: 0; }
.header-progress b { color: var(--ink); font-size: 10px; min-width: 30px; text-align: right; }
.mobile-map-toggle { display: none; }

.theme-floors .course-header {border:0px!important;}

.chapter-flow { padding-top: 0px; }
.lesson-scene {
  min-height: calc(100vh - var(--header-h));
  min-height: calc(100svh - var(--header-h));
  overflow: clip;
  padding: clamp(72px, 8vw, 128px) max(96px, calc((100vw - 1220px) / 2));
  position: relative;
  scroll-margin-top: var(--header-h);
}
.lesson-scene + .lesson-scene { border-top: 1px solid rgba(19, 38, 67, .09); }
.scene-index { align-items: center; color: var(--orange-deep); display: flex; font-size: 10px; font-weight: 750; gap: 12px; letter-spacing: .16em; margin: 0 0 24px; text-transform: uppercase; }
.scene-index span { color: currentColor; font-family: var(--serif); font-size: 20px; letter-spacing: 0; }
.text-action, .scene-next, .primary-action { text-decoration: none; }
.text-action { align-items: center; color: var(--ink); display: inline-flex; font-size: 12px; font-weight: 750; gap: 18px; margin-top: 30px; }
.text-action i, .scene-next i, .primary-action i, .completion-panel a i { color: var(--orange); font-style: normal; transition: transform .25s ease; }
.text-action:hover i, .primary-action:hover i, .completion-panel a:hover i { transform: translateX(5px); }
.scene-next { align-items: center; bottom: 34px; color: var(--muted); display: flex; font-size: 10px; font-weight: 700; gap: 14px; letter-spacing: .08em; position: absolute; right: max(96px, calc((100vw - 1220px) / 2)); text-transform: uppercase; }
.scene-next i { font-size: 17px; }
.scene-next:hover i { transform: translateY(4px); }

.scene-rail {
  align-items: center;
  background: rgba(255, 253, 248, .92);
  border: 1px solid rgba(19, 38, 67, .1);
  border-radius: 16px;
  box-shadow: 0 18px 60px rgba(19, 38, 67, .08);
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 10px 12px;
  position: fixed;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 66px;
  z-index: 70;
}
.scene-rail > p { color: var(--muted); font-size: 8px; font-weight: 750; letter-spacing: .08em; margin: 0 0 6px; text-align: center; text-transform: uppercase; }
.scene-rail > a { align-items: center; display: flex; justify-content: center; min-height: 38px; position: relative; text-decoration: none; width: 100%; }
.scene-rail > a > i { background: rgba(19, 38, 67, .18); border-radius: 50%; height: 7px; transition: transform .25s ease, background .25s ease; width: 7px; }
.scene-rail > a span { background: var(--ink); border-radius: 8px; color: white; font-size: 9px; opacity: 0; padding: 8px 10px; pointer-events: none; position: absolute; right: calc(100% + 12px); transform: translateX(6px); transition: opacity .2s ease, transform .2s ease; white-space: nowrap; }
.scene-rail > a span::after { border: 5px solid transparent; border-left-color: var(--ink); content: ""; left: 100%; position: absolute; top: 50%; transform: translateY(-50%); }
.scene-rail > a b { color: #ff8b5e; margin-right: 5px; }
.scene-rail > a:hover span, .scene-rail > a:focus-visible span { opacity: 1; transform: translateX(0); }
.scene-rail > a.is-active > i { background: var(--orange); transform: scale(1.6); }
.scene-rail > a.is-viewed > i { background: var(--ink); }
.scene-rail > a.is-active > i { background: var(--orange); }
.rail-progress { align-items: center; display: flex; flex-direction: column; gap: 5px; margin-top: 7px; }
.rail-progress > span { background: rgba(19, 38, 67, .11); border-radius: 999px; height: 52px; overflow: hidden; position: relative; width: 3px; }
.rail-progress i { background: var(--orange); bottom: 0; left: 0; position: absolute; right: 0; transition: height .35s ease; }
.rail-progress b { color: var(--muted); font-size: 8px; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s ease; }
.reveal.is-revealed { opacity: 1; transform: translateY(0); }

/* Review index */
.review-page { background: #eae5d9; min-height: 100vh; }
.review-header { align-items: center; display: flex; justify-content: space-between; margin: auto; padding: 28px 0; width: var(--content); }
.review-header p { color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .12em; margin: 0; text-transform: uppercase; }
.review-main { margin: auto; padding: clamp(70px, 8vw, 124px) 0; width: var(--content); }
.review-hero { max-width: 960px; }
.eyebrow { color: var(--orange-deep); font-size: 10px; font-weight: 750; letter-spacing: .15em; text-transform: uppercase; }
.review-hero h1 { color: var(--ink); font-family: var(--serif); font-size: clamp(48px, 5.8vw, 82px); letter-spacing: -.032em; line-height: .98; margin: 24px 0 30px; }
.review-lead { color: #536071; font-size: clamp(16px, 1.4vw, 20px); line-height: 1.75; max-width: 740px; }
.review-grid { display: grid; gap: 18px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: clamp(70px, 8vw, 120px); }
.review-card { align-items: end; background: var(--white); border-radius: 18px; display: grid; gap: 50px; grid-template-columns: auto 1fr; min-height: 340px; overflow: hidden; padding: 34px; position: relative; text-decoration: none; transition: transform .3s ease, background .3s ease; }
.review-card::after { background: var(--card-accent, var(--orange)); bottom: 0; content: ""; height: 6px; left: 0; position: absolute; transform: scaleX(.16); transform-origin: left; transition: transform .35s ease; width: 100%; }
.review-card:hover { transform: translateY(-6px); }
.review-card:hover::after { transform: scaleX(1); }
.review-card--intro { --card-accent: #f45d22; }
.review-card--purpose { --card-accent: #ff641e; background: #fff0e7; }
.review-card--plot { --card-accent: #102445; background: #edf0f4; }
.review-card--floors { --card-accent: #ff7240; background: #182941; color: white; }
.review-number { color: var(--card-accent); font-family: var(--serif); font-size: 30px; }
.review-card p { color: var(--card-accent); font-size: 9px; font-weight: 750; letter-spacing: .14em; margin: 0 0 14px; text-transform: uppercase; }
.review-card h2 { color: inherit; font-family: var(--serif); font-size: clamp(29px, 2.6vw, 40px); letter-spacing: -.024em; line-height: 1.08; margin: 0 0 34px; }
.review-link { font-size: 11px; font-weight: 700; }
.review-link b { color: var(--card-accent); display: inline-block; margin-left: 10px; transition: transform .2s ease; }
.review-card:hover .review-link b { transform: translate(4px, -4px); }
.review-contract { background: var(--orange); border-radius: 18px; color: white; margin-top: 18px; padding: clamp(42px, 6vw, 84px); }
.review-contract .eyebrow { color: var(--ink); }
.review-contract h2 { font-family: var(--serif); font-size: clamp(40px, 5vw, 66px); letter-spacing: -.028em; margin: 18px 0; }
.review-contract > p:last-child { font-size: 15px; line-height: 1.7; max-width: 780px; }

/* Introduction — editorial/cinematic */
.theme-intro { --paper: #f8f5ee; }
.intro-opening { align-items: center; display: grid; gap: clamp(50px, 7vw, 105px); grid-template-columns: .9fr 1.1fr; }
.intro-opening__copy h1 { color: var(--ink); font-family: var(--serif); font-size: clamp(54px, 5.7vw, 86px); letter-spacing: -.034em; line-height: .94; margin: 0 0 34px; }
.hero-lead { color: #556174; font-size: clamp(17px, 1.5vw, 21px); line-height: 1.72; max-width: 570px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 28px; }
.hero-meta span { color: var(--muted); font-size: 10px; font-weight: 650; letter-spacing: .06em; text-transform: uppercase; }
.intro-opening__media img { aspect-ratio: 16/11; object-fit: cover; width: 100%; }
.intro-fragments { align-items: center; background: #efe9dd; display: grid; gap: 44px 72px; grid-template-columns: .8fr 1.2fr; }
.fragment-title h2 { color: var(--ink); font-family: var(--serif); font-size: clamp(47px, 5vw, 72px); letter-spacing: -.032em; line-height: .98; margin: 0 0 28px; }
.fragment-title > p:last-child { color: #596474; line-height: 1.7; max-width: 470px; }
.fragment-board { height: 430px; position: relative; }
.fragment-board article { background: var(--white); border-radius: 14px; left: var(--x); padding: 24px 26px; position: absolute; top: var(--y); transform: rotate(var(--r)); transition: transform .3s ease; width: 190px; }
.fragment-board article:hover { transform: rotate(0) translateY(-7px); }
.fragment-board strong { color: var(--ink); display: block; font-family: var(--serif); font-size: 27px; }
.fragment-board span { color: var(--muted); font-size: 10px; font-weight: 650; letter-spacing: .05em; text-transform: uppercase; }
.fragment-principle { align-items: center; background: var(--ink); border-radius: 14px; color: white; display: grid; gap: 24px; grid-column: 1 / -1; grid-template-columns: 140px 1fr; padding: 24px 28px; }
.fragment-principle span { color: #ff8a58; font-size: 9px; font-weight: 750; letter-spacing: .13em; text-transform: uppercase; }
.fragment-principle p { font-family: var(--serif); font-size: clamp(20px, 2.2vw, 30px); line-height: 1.25; margin: 0; }
.intro-path { background: var(--white); display: grid; gap: 36px 75px; grid-template-columns: .85fr 1.15fr; }
.path-copy h2 { color: var(--ink); font-family: var(--serif); font-size: clamp(44px, 4.6vw, 68px); letter-spacing: -.03em; line-height: 1; margin: 0 0 28px; }
.path-copy > p:last-child { color: var(--muted); line-height: 1.7; }
.path-sequence { counter-reset: none; list-style: none; margin: 0; padding: 0; }
.path-sequence li { align-items: start; border-top: 1px solid var(--line); display: grid; gap: 22px; grid-template-columns: 45px 1fr; padding: 22px 0; transition: padding-left .25s ease; }
.path-sequence li:hover { padding-left: 9px; }
.path-sequence > li > span { color: var(--orange); font-family: var(--serif); font-size: 20px; }
.path-sequence strong { color: var(--ink); display: block; font-family: var(--serif); font-size: 23px; }
.path-sequence p { color: var(--muted); font-size: 12px; line-height: 1.55; margin: 5px 0 0; }
.path-media { grid-column: 1 / -1; justify-self: center; max-width: 100%; width: 100%; }
.path-media img { width: 100%; }
.intro-outcome { align-items: center; background: var(--ink); color: rgba(255,255,255,.75); display: grid; gap: clamp(50px, 8vw, 120px); grid-template-columns: .45fr 1.55fr; }
.outcome-number { color: rgba(255,255,255,.08); font-family: var(--serif); font-size: clamp(180px, 25vw, 400px); letter-spacing: -.08em; line-height: .7; }
.outcome-copy { max-width: 840px; }
.outcome-copy h2 { color: white; font-family: var(--serif); font-size: clamp(45px, 4.8vw, 70px); letter-spacing: -.03em; line-height: .98; margin: 0 0 30px; }
.outcome-lead { font-size: 16px; line-height: 1.7; max-width: 650px; }
.editorial-checklist { list-style: none; margin: 44px 0; padding: 0; }
.editorial-checklist li { border-top: 1px solid rgba(255,255,255,.15); display: grid; gap: 25px; grid-template-columns: 150px 1fr; padding: 17px 0; }
.editorial-checklist span { color: #ff8a58; font-size: 10px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.editorial-checklist p { font-family: var(--serif); font-size: 18px; margin: 0; }
.primary-action { align-items: center; background: var(--orange); border-radius: 10px; color: white; display: inline-grid; font-size: 11px; font-weight: 750; gap: 30px; grid-template-columns: auto auto auto; padding: 16px 20px; }
.primary-action span { color: rgba(255,255,255,.7); font-weight: 500; }
.primary-action i { color: white; }

/* Purpose — warm decision studio */
.theme-purpose { --paper: #f7f4ed; --ink: #102445; --text: #2d3b50; --muted: #697586; --orange: #ff641e; --orange-deep: #d9480f; --line: rgba(16, 36, 69, .15); }
.theme-purpose .course-header { background: rgba(247, 244, 237, .94); }
.purpose-chaos { align-items: end; background: #f7f4ed; display: grid; gap: 28px 64px; grid-template-columns: .9fr 1.1fr; }
.purpose-title h1 { color: var(--ink); font-family: var(--serif); font-size: clamp(50px, 5.2vw, 76px); letter-spacing: -.033em; line-height: .96; margin: 0 0 28px; }
.purpose-title > p:not(.scene-index) { line-height: 1.72; max-width: 520px; }
.purpose-question { align-self: center; background: #102445; border-radius: 16px; color: white; padding: clamp(35px, 4.5vw, 66px); }
.purpose-question > span { color: #ef987b; font-size: 9px; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.purpose-question blockquote { font-family: var(--serif); font-size: clamp(34px, 3.6vw, 52px); letter-spacing: -.022em; line-height: 1.08; margin: 24px 0; }
.purpose-question p { color: rgba(255,255,255,.62); font-size: 12px; }
.purpose-opening-media { grid-column: 1 / -1; justify-self: end; max-width: 100%; width: 100%; }
.purpose-opening-media img { aspect-ratio: 16/9; object-fit: cover; width: 100%; }
.purpose-illusion { background: #102445; color: rgba(255,255,255,.7); display: grid; gap: 35px 68px; grid-template-columns: .86fr 1.14fr; }
.purpose-section-heading h2 { color: inherit; font-family: var(--serif); font-size: clamp(44px, 4.6vw, 68px); letter-spacing: -.03em; line-height: .99; margin: 0 0 26px; }
.purpose-illusion .purpose-section-heading h2 { color: white; }
.purpose-section-heading > p:last-child { line-height: 1.7; max-width: 620px; }
.purpose-comparison-media { align-self: center; }
.purpose-comparison-media img { width: 100%; }
.purpose-versus { align-items: stretch; display: grid; gap: 18px; grid-column: 1 / -1; grid-template-columns: 1fr auto 1fr; }
.purpose-versus article { background: rgba(255,255,255,.06); border-radius: 14px; padding: 28px; }
.purpose-versus > div { align-self: center; color: #ef7650; font-family: var(--serif); font-size: 34px; }
.purpose-versus span { color: #ef987b; font-size: 9px; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.purpose-versus strong { color: white; display: block; font-family: var(--serif); font-size: 26px; margin: 12px 0; }
.purpose-versus p { font-size: 12px; line-height: 1.65; margin: 0; }
.purpose-illusion .scene-next { color: rgba(255,255,255,.55); }
.purpose-shift { background: #fbfaf6; }
.purpose-section-heading--compact { max-width: 800px; }
.purpose-archetypes { display: grid; gap: 12px; grid-template-columns: repeat(4, 1fr); margin-top: 54px; }
.archetype { border-radius: 16px; display: flex; flex-direction: column; min-height: 390px; padding: 28px; transition: transform .3s ease; }
.archetype:hover { transform: translateY(-7px); }
.archetype > span { font-family: var(--serif); font-size: 22px; }
.archetype h3 { font-family: var(--serif); font-size: 27px; letter-spacing: -.025em; line-height: 1.05; margin: auto 0 18px; }
.archetype p { font-size: 12px; line-height: 1.65; }
.archetype ul { border-top: 1px solid currentColor; list-style: none; margin: 18px 0 0; padding: 15px 0 0; }
.archetype li { font-size: 10px; margin-top: 8px; padding-left: 15px; position: relative; }
.archetype li::before { content: "—"; left: 0; position: absolute; }
.archetype--home { background: #d7dfcf; color: #314430; }
.archetype--rental { background: #d3dee6; color: #233f52; }
.archetype--villa { background: #e8d8c4; color: #5a3a24; }
.archetype--commercial { background: #838383; color: #f4eee5; }
.purpose-system { align-items: center; background: #edf0f4; display: grid; gap: 38px 70px; grid-template-columns: .82fr 1.18fr; }
.system-copy h2 { color: var(--ink); font-family: var(--serif); font-size: clamp(43px, 4.4vw, 65px); letter-spacing: -.03em; line-height: 1; margin: 0 0 25px; }
.system-copy > p:not(.scene-index) { line-height: 1.7; }
.system-copy blockquote { border-left: 3px solid var(--orange); font-family: var(--serif); font-size: 23px; line-height: 1.35; margin: 35px 0 0; padding-left: 22px; }
.purpose-cascade { list-style: none; margin: 0; padding: 0; }
.purpose-cascade li { align-items: center; background: rgba(255,255,255,.58); border-radius: 12px; display: grid; gap: 22px; grid-template-columns: 115px 1fr; margin-top: 9px; padding: 17px 20px; transition: transform .25s ease, background .25s ease; }
.purpose-cascade li:hover { background: white; transform: translateX(6px); }
.purpose-cascade span { color: var(--orange-deep); font-size: 10px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.purpose-cascade p { font-size: 12px; line-height: 1.5; margin: 0; }
.system-media { grid-column: 1 / -1; justify-self: center; max-width: 100%; width: 100%; }
.purpose-craft { align-items: start; background: #f45d22; color: rgba(255,255,255,.82); display: grid; gap: 50px 80px; grid-template-columns: .82fr 1.18fr; }
.allocation-copy h2 { color: white; font-family: var(--serif); font-size: clamp(43px, 4.3vw, 64px); letter-spacing: -.029em; line-height: .99; margin: 0 0 27px; }
.allocation-copy > p:not(.scene-index) { line-height: 1.7; }
.theme-purpose .purpose-craft .scene-index { color: #ffd0c0; }
.token-readout { align-items: center; border-top: 1px solid rgba(255,255,255,.3); display: flex; gap: 15px; margin-top: 36px; padding-top: 22px; }
.token-readout span { color: white; font-family: var(--serif); font-size: 48px; }
.token-readout p { font-size: 10px; font-weight: 700; letter-spacing: .1em; margin: 0; text-transform: uppercase; }
.allocation-board { display: grid; gap: 10px; }
.allocation-board > button:not(.review-decision) { align-items: center; background: rgba(255,255,255,.12); border: 0; border-radius: 12px; color: white; cursor: pointer; display: grid; gap: 7px 15px; grid-template-columns: 1fr auto; min-height: 78px; padding: 17px 18px; text-align: left; transition: background .25s ease, transform .25s ease; }
.allocation-board > button:not(.review-decision):hover { background: rgba(255,255,255,.2); transform: translateX(4px); }
.allocation-board button span { font-family: var(--serif); font-size: 19px; }
.allocation-board button small { color: rgba(255,255,255,.6); font-size: 10px; grid-column: 1; }
.allocation-board button i { align-items: center; border: 1px solid rgba(255,255,255,.45); border-radius: 50%; display: flex; font-style: normal; grid-column: 2; grid-row: 1 / 3; height: 28px; justify-content: center; width: 28px; }
.allocation-board > button.is-selected { background: #102445; }
.allocation-board > button.is-selected i { background: white; border-color: white; color: #102445; }
.review-decision { background: white; border: 0; border-radius: 10px; color: #102445; cursor: pointer; font-size: 11px; font-weight: 750; margin-top: 8px; min-height: 50px; padding: 14px 18px; }
.review-decision:disabled { cursor: not-allowed; opacity: .45; }
.allocation-feedback { font-size: 11px; line-height: 1.55; margin: 5px 2px 0; }
.completion-panel { align-items: center; background: #102445; border-radius: 15px; color: white; display: grid; gap: 16px 24px; grid-column: 1 / -1; grid-template-columns: auto 1fr auto; padding: 23px 26px; }
.completion-panel > span { color: #ef987b; font-size: 9px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.completion-panel > p { font-family: var(--serif); font-size: 18px; margin: 0; }
.completion-panel > a { color: white; font-size: 11px; font-weight: 750; text-decoration: none; }
.completion-panel a i { margin-left: 12px; }

/* Plot — technical relationship lab */
.theme-plot { --paper: #f7f4ed; --ink: #102445; --text: #2d3b50; --muted: #697586; --orange: #ff641e; --orange-deep: #d9480f; --line: rgba(16, 36, 69, .15); }
.theme-plot .course-header { background: rgba(247, 244, 237, .94); }
.plot-chaos { align-items: center; background-color: #f7f4ed; background-image: linear-gradient(rgba(16,36,69,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(16,36,69,.035) 1px, transparent 1px); background-size: 32px 32px; display: grid; gap: 60px; grid-template-columns: .86fr 1.14fr; }
.plot-title h1 { color: var(--ink); font-family: var(--serif); font-size: clamp(48px, 5vw, 74px); letter-spacing: -.032em; line-height: .97; margin: 0 0 28px; }
.plot-title > p:not(.scene-index) { line-height: 1.7; max-width: 540px; }
.plot-definitions { margin: 40px 0 0; }
.plot-definitions div { border-top: 1px solid var(--line); display: grid; gap: 20px; grid-template-columns: 115px 1fr; padding: 15px 0; }
.plot-definitions dt { color: var(--orange-deep); font-size: 10px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.plot-definitions dd { font-size: 12px; line-height: 1.55; margin: 0; }
.plot-opening-media img { aspect-ratio: 1/1; object-fit: cover; width: 100%; }
.plot-illusion { background: #102445; color: rgba(255,255,255,.72); }
.plot-section-heading { max-width: 1040px; }
.plot-section-heading h2 { color: white; font-family: var(--serif); font-size: clamp(45px, 4.7vw, 70px); letter-spacing: -.03em; line-height: .99; margin: 0 0 26px; }
.plot-section-heading > p:last-child { line-height: 1.7; max-width: 650px; }
.plot-illusion .scene-index { color: #ff9468; }
.area-lab { align-items: center; display: grid; gap: clamp(50px, 7vw, 100px); grid-template-columns: 1.05fr .95fr; margin-top: 65px; }
.area-diagram { aspect-ratio: 1; background: #b8c894; border-radius: 18px; overflow: hidden; position: relative; }
.area-diagram::before { background: repeating-linear-gradient(135deg, rgba(255,255,255,.25) 0 2px, transparent 2px 10px); bottom: 0; content: ""; left: 0; position: absolute; right: 0; top: 0; }
.area-diagram__plot, .area-diagram__open { color: #1c332c; font-size: 9px; font-weight: 750; letter-spacing: .1em; position: absolute; text-transform: uppercase; z-index: 2; }
.area-diagram__plot { left: 20px; top: 18px; }
.area-diagram__open { bottom: 18px; right: 20px; }
.area-diagram__footprint { align-items: center; background: #f7f2e8; border-radius: 6px; bottom: 11%; display: flex; justify-content: center; left: 13%; position: absolute; right: 13%; top: 14%; transition: inset .35s ease; z-index: 1; }
.area-diagram__footprint span { color: #1c332c; font-family: var(--serif); font-size: clamp(20px, 3vw, 36px); font-weight: 700; }
.lab-label { color: #ff9468; font-size: 9px; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.area-controls h3 { color: white; font-family: var(--serif); font-size: clamp(34px, 4vw, 53px); letter-spacing: -.04em; line-height: 1; margin: 15px 0 35px; }
.area-controls label { align-items: end; display: flex; justify-content: space-between; }
.area-controls label span { font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.area-controls output { color: white; font-family: var(--serif); font-size: 26px; }
.area-controls input { accent-color: #ff7640; margin: 18px 0 6px; width: 100%; }
.range-ends { color: rgba(255,255,255,.48); display: flex; font-size: 8px; justify-content: space-between; }
.area-readout { display: grid; grid-template-columns: repeat(3, 1fr); margin: 36px 0 0; }
.area-readout div { border-left: 1px solid rgba(255,255,255,.14); padding-left: 15px; }
.area-readout div:first-child { border-left: 0; padding-left: 0; }
.area-readout dt { color: rgba(255,255,255,.5); font-size: 8px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.area-readout dd { color: white; font-family: var(--serif); font-size: 25px; margin: 8px 0 0; }
.area-readout small { font-family: var(--sans); font-size: 8px; }
.lab-note { color: rgba(255,255,255,.5); font-size: 9px; margin-top: 26px; }
.plot-illusion .scene-next { color: rgba(255,255,255,.5); }
.plot-shift { align-content: center; background: #f5f2e9; display: grid; gap: 50px 70px; grid-template-columns: .8fr 1.2fr; }
.plot-shift-copy h2 { color: var(--ink); font-family: var(--serif); font-size: clamp(43px, 4.4vw, 65px); letter-spacing: -.03em; line-height: 1; margin: 0 0 25px; }
.plot-shift-copy > p:not(.scene-index) { line-height: 1.7; }
.question-pair { display: grid; gap: 14px; }
.question-pair article { border-left: 4px solid var(--orange); padding: 18px 0 18px 26px; transition: transform .25s ease; }
.question-pair article:hover { transform: translateX(7px); }
.question-pair span { color: var(--orange-deep); font-size: 9px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.question-pair h3 { color: var(--ink); font-family: var(--serif); font-size: clamp(24px, 2.8vw, 38px); line-height: 1.12; margin: 10px 0 13px; }
.question-pair p { color: var(--muted); font-size: 12px; line-height: 1.6; margin: 0; }
.land-principle { align-items: center; background: #dce5ce; border-radius: 14px; display: grid; gap: 25px; grid-column: 1 / -1; grid-template-columns: auto 1fr; margin: 10px 0 0; padding: 26px 30px; }
.land-principle strong { color: var(--ink); font-family: var(--serif); font-size: 32px; }
.land-principle p { margin: 0; }
.plot-system { background: #e4eadb; }
.plot-section-heading--table h2 { color: var(--ink); }
.footprint-table-wrap { margin-top: 55px; overflow-x: auto; }
.footprint-table { border-collapse: collapse; min-width: 760px; width: 100%; }
.footprint-table th { border-bottom: 2px solid var(--ink); color: var(--ink); font-size: 9px; letter-spacing: .1em; padding: 13px 15px; text-align: left; text-transform: uppercase; }
.footprint-table td { border-bottom: 1px solid rgba(28,51,44,.18); font-size: 12px; padding: 20px 15px; vertical-align: middle; }
.footprint-table td:first-child strong { color: var(--ink); font-family: var(--serif); font-size: 27px; }
.footprint-table tr.is-working td { background: rgba(255,255,255,.55); }
.footprint-table tr.is-working td:first-child { box-shadow: inset 4px 0 var(--orange); }
.usage-bar { background: rgba(28,51,44,.1); border-radius: 999px; display: inline-block; height: 7px; margin-right: 10px; overflow: hidden; vertical-align: middle; width: 100px; }
.usage-bar i { background: var(--orange); display: block; height: 100%; }
.open-area-list { align-items: start; display: grid; gap: 50px; grid-template-columns: .55fr 1.45fr; margin-top: 70px; }
.open-area-list h3 { color: var(--ink); font-family: var(--serif); font-size: 35px; margin: 0; }
.open-area-list ul { display: grid; gap: 20px 28px; grid-template-columns: 1fr 1fr; list-style: none; margin: 0; padding: 0; }
.open-area-list li { border-top: 1px solid var(--line); padding-top: 14px; }
.open-area-list span { color: var(--orange-deep); font-size: 9px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.open-area-list p { font-size: 12px; line-height: 1.55; margin-bottom: 0; }
.plot-craft { align-items: center; background: #f5f2e9; display: grid; gap: 40px 75px; grid-template-columns: .84fr 1.16fr; }
.plot-craft-copy h2 { color: var(--ink); font-family: var(--serif); font-size: clamp(43px, 4.4vw, 65px); letter-spacing: -.03em; line-height: 1; margin: 0 0 26px; }
.plot-craft-copy > p:not(.scene-index) { line-height: 1.7; }
.statement-check { display: grid; gap: 10px; }
.statement-check button { align-items: center; background: #e7ebdf; border: 0; border-radius: 12px; color: var(--text); cursor: pointer; display: grid; gap: 17px; grid-template-columns: 36px 1fr; min-height: 76px; padding: 14px 18px; text-align: left; transition: transform .22s ease, background .22s ease; }
.statement-check button:hover { background: #dce5ce; transform: translateX(5px); }
.statement-check button span { align-items: center; background: var(--ink); border-radius: 50%; color: white; display: flex; font-size: 10px; height: 30px; justify-content: center; width: 30px; }
.statement-check button p { font-size: 12px; line-height: 1.55; margin: 0; }
.statement-check button.is-correct { background: #bfd1af; }
.statement-check button.is-wrong { background: #eed4c8; }
.statement-check > p { color: var(--muted); font-size: 10px; }
.plot-reference-media { grid-column: 1 / -1; justify-self: center; max-width: 100%; width: 100%; }
.plot-craft .completion-panel { background: var(--ink); }

/* Floors — vertical construction story */
.theme-floors { --paper: #14253b; --ink: #11223a; --text: #d8dfeb; --muted: #94a2b5; --orange: #ff6a32; --orange-deep: #e6501c; --line: rgba(255,255,255,.15); color: var(--text); }
.theme-floors .course-header { background: rgba(20, 37, 59, .94); border-bottom-color: rgba(255,255,255,.1); }
.theme-floors .wordmark, .theme-floors .header-context strong, .theme-floors .header-progress b { color: white; }
.theme-floors .header-context { border-left-color: rgba(255,255,255,.15); }
.theme-floors .header-context span { color: #9cabc0; }
.theme-floors .header-progress > span { background: rgba(255,255,255,.14); }
.theme-floors .scene-rail { background: rgba(20,37,59,.93); border-color: rgba(255,255,255,.13); }
.theme-floors .scene-rail > p, .theme-floors .rail-progress b { color: #9cabc0; }
.theme-floors .scene-rail > a > i { background: rgba(255,255,255,.25); }
.theme-floors .scene-rail > a.is-viewed > i { background: white; }
.theme-floors .scene-rail > a.is-active > i { background: var(--orange); }
.floor-chaos { align-items: center; background: #14253b; display: grid; gap: 45px 85px; grid-template-columns: 1.1fr .9fr; }
.floor-title h1 { color: white; font-family: var(--serif); font-size: clamp(49px, 5.2vw, 78px); letter-spacing: -.033em; line-height: .96; margin: 0 0 28px; }
.floor-title > p:not(.scene-index) { color: #aab6c6; font-size: 16px; line-height: 1.7; max-width: 650px; }
.floor-equation { align-items: center; display: grid; gap: 18px; grid-template-columns: 1fr auto 1fr; }
.floor-equation div { background: rgba(255,255,255,.06); border-radius: 15px; padding: 25px; text-align: center; }
.floor-equation span { color: #99a7bb; display: block; font-size: 9px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.floor-equation strong { color: white; display: block; font-family: var(--serif); font-size: clamp(44px, 5vw, 70px); line-height: 1; margin-top: 15px; }
.floor-equation small { color: var(--orange); font-size: 9px; }
.floor-equation > i { color: var(--orange); font-family: var(--serif); font-size: 35px; font-style: normal; }
.floor-answer { border-top: 1px solid rgba(255,255,255,.14); display: flex; gap: 35px; grid-column: 1 / -1; padding-top: 26px; }
.floor-answer p { color: white; font-family: var(--serif); font-size: clamp(20px, 2vw, 27px); margin: 0; }
.theme-floors .scene-next { color: #8f9caf; }
.floor-illusion { align-items: center; background: #e9e2d7; color: #445064; display: grid; gap: 70px; grid-template-columns: 1.15fr .85fr; }
.floor-opening-media img { width: 100%; }
.floor-illusion-copy h2 { color: var(--ink); font-family: var(--serif); font-size: clamp(43px, 4.5vw, 67px); letter-spacing: -.03em; line-height: 1; margin: 0 0 28px; }
.floor-illusion-copy > p:not(.scene-index) { line-height: 1.7; }
.floor-illusion-copy blockquote { color: var(--orange-deep); font-family: var(--serif); font-size: clamp(25px, 3vw, 41px); line-height: 1.2; margin: 38px 0 0; }
.floor-shift { align-items: center; background: #182a43; display: grid; gap: 60px 90px; grid-template-columns: .8fr 1.2fr; }
.floor-builder-copy h2 { color: white; font-family: var(--serif); font-size: clamp(44px, 4.6vw, 68px); letter-spacing: -.03em; line-height: 1; margin: 0 0 28px; }
.floor-builder-copy > p:not(.scene-index) { color: #aab6c6; line-height: 1.7; }
.configuration-buttons { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 34px; }
.configuration-buttons button { background: transparent; border: 1px solid rgba(255,255,255,.18); border-radius: 999px; color: white; cursor: pointer; font-size: 10px; min-height: 39px; padding: 9px 18px; transition: background .22s ease, border-color .22s ease, transform .22s ease; }
.configuration-buttons button:hover { transform: translateY(-3px); }
.configuration-buttons button.is-active { background: var(--orange); border-color: var(--orange); }
.floor-builder { align-items: end; display: grid; gap: 35px; grid-template-columns: 1fr .8fr; }
.building-stack { height: 440px; perspective: 900px; position: relative; }
.stack-site { background: #38485b; bottom: 14px; color: #aab6c6; font-size: 9px; left: 6%; letter-spacing: .1em; padding: 20px; position: absolute; right: 6%; text-align: center; text-transform: uppercase; transform: rotateX(58deg) rotateZ(-2deg); }
.stack-level, .stack-roof { background: rgba(235, 239, 243, .92); border-radius: 4px; height: 62px; left: 16%; position: absolute; right: 16%; transform: skewY(-4deg); transition: opacity .35s ease, transform .35s ease; }
.stack-level::before, .stack-level::after { background: rgba(255,255,255,.15); bottom: -56px; content: ""; position: absolute; top: 50px; width: 8px; }
.stack-level::before { left: 18px; }
.stack-level::after { right: 18px; }
.stack-level span { color: #182a43; font-size: 8px; font-weight: 750; left: 14px; letter-spacing: .09em; position: absolute; top: 15px; text-transform: uppercase; }
.stack-level--1 { bottom: 68px; }
.stack-level--2 { bottom: 143px; }
.stack-level--3 { bottom: 218px; }
.stack-level--4 { bottom: 293px; }
.stack-roof { background: var(--orange); bottom: 365px; height: 16px; }
.floor-builder[data-levels="1"] .stack-level--2, .floor-builder[data-levels="1"] .stack-level--3, .floor-builder[data-levels="1"] .stack-level--4,
.floor-builder[data-levels="2"] .stack-level--3, .floor-builder[data-levels="2"] .stack-level--4,
.floor-builder[data-levels="3"] .stack-level--4 { opacity: 0; transform: skewY(-4deg) translateY(35px); }
.floor-builder[data-levels="1"] .stack-roof { bottom: 130px; }
.floor-builder[data-levels="2"] .stack-roof { bottom: 205px; }
.floor-builder[data-levels="3"] .stack-roof { bottom: 280px; }
.builder-readout { margin: 0; }
.builder-readout > div { border-top: 1px solid rgba(255,255,255,.14); padding: 17px 0; }
.builder-readout dt { color: #92a0b3; font-size: 8px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.builder-readout dd { color: white; font-family: var(--serif); font-size: 30px; margin: 8px 0 0; }
.builder-readout small { color: #92a0b3; font-family: var(--sans); font-size: 8px; }
.builder-readout .builder-total dd { color: var(--orange); font-size: 39px; }
.floor-system { background: #f0ece4; color: #445064; }
.floor-system-heading h2 { color: var(--ink); font-family: var(--serif); font-size: clamp(45px, 4.7vw, 70px); letter-spacing: -.03em; line-height: .99; margin: 0 0 26px; max-width: 920px; }
.floor-system-heading > p:not(.scene-index) { line-height: 1.7; max-width: 680px; }
.floor-ledger { margin-top: 60px; }
.floor-ledger > div { align-items: center; border-bottom: 1px solid rgba(17,34,58,.14); display: grid; gap: 25px; grid-template-columns: .7fr 1.2fr 1fr; min-height: 78px; padding: 12px 18px; }
.floor-ledger .ledger-head { border-bottom: 2px solid var(--ink); color: #6b7687; font-size: 9px; font-weight: 750; letter-spacing: .1em; min-height: 44px; text-transform: uppercase; }
.floor-ledger strong { color: var(--ink); font-family: var(--serif); font-size: 25px; }
.floor-ledger > div > span:not([role="columnheader"]) { align-items: center; color: #647082; display: flex; gap: 18px; }
.floor-ledger i { background: linear-gradient(90deg, var(--orange), #ffad88); display: block; height: 8px; width: calc(var(--levels) * 20%); }
.floor-ledger b { color: var(--ink); font-family: var(--serif); font-size: 24px; text-align: right; }
.floor-ledger .is-target { background: var(--ink); border-radius: 10px; color: white; }
.floor-ledger .is-target strong, .floor-ledger .is-target b { color: white; }
.floor-ledger .is-target > span { color: #b3becd !important; }
.floor-notes { display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); margin-top: 45px; }
.floor-notes article { border-top: 2px solid var(--orange); padding-top: 15px; }
.floor-notes span { color: var(--orange-deep); font-size: 9px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.floor-notes p { color: #647082; font-size: 12px; line-height: 1.55; }
.floor-craft { align-items: start; background: #11223a; display: grid; gap: 42px 80px; grid-template-columns: .8fr 1.2fr; }
.floor-craft-copy h2 { color: white; font-family: var(--serif); font-size: clamp(43px, 4.4vw, 66px); letter-spacing: -.03em; line-height: 1; margin: 0 0 26px; }
.floor-craft-copy > p:not(.scene-index) { color: #a8b4c4; line-height: 1.7; }
.target-builder { background: rgba(255,255,255,.06); border-radius: 15px; padding: 30px; }
.target-readout > span { color: #8f9daf; font-size: 8px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.target-readout > strong { color: white; display: block; font-family: var(--serif); font-size: 42px; margin-top: 12px; }
.target-readout p { color: #a7b3c3; }
.target-readout p b { color: var(--orange); font-family: var(--serif); font-size: 28px; }
.target-readout > i { background: rgba(255,255,255,.12); border-radius: 999px; display: block; height: 7px; overflow: hidden; }
.target-readout > i span { background: var(--orange); display: block; height: 100%; transition: width .35s ease; width: 33.33%; }
.target-controls { align-items: center; display: grid; gap: 15px; grid-template-columns: 46px 1fr 46px; margin: 28px 0; }
.target-controls button { background: var(--orange); border: 0; border-radius: 50%; color: white; cursor: pointer; font-size: 23px; height: 44px; width: 44px; }
.target-controls > span { color: #b1bdcc; font-size: 11px; text-align: center; }
.target-controls b { color: white; }
.target-builder fieldset { border: 0; margin: 30px 0 0; padding: 0; }
.target-builder fieldset:disabled { opacity: .42; }
.target-builder legend { color: white; font-family: var(--serif); font-size: 21px; margin-bottom: 15px; }
.target-builder fieldset button { background: rgba(255,255,255,.08); border: 0; border-radius: 9px; color: white; cursor: pointer; margin-top: 8px; min-height: 46px; padding: 12px 15px; text-align: left; width: 100%; }
.target-builder fieldset button:hover { background: rgba(255,255,255,.15); }
.target-feedback { color: #9daabc; font-size: 10px; line-height: 1.5; }
.floor-reference-media { grid-column: 1 / -1; justify-self: center; max-width: 650px; width: 58%; }
.theme-floors .completion-panel { background: var(--orange); }
.theme-floors .completion-panel > span { color: #342017; }

@media (max-width: 1100px) {
  :root { --content: min(900px, calc(100vw - 64px)); }
  .lesson-scene { padding-left: 52px; padding-right: 100px; }
  .scene-next { right: 100px; }
  .intro-opening, .intro-fragments, .purpose-chaos, .purpose-illusion, .purpose-system, .purpose-craft, .plot-chaos, .plot-shift, .plot-craft, .floor-chaos, .floor-illusion, .floor-shift, .floor-craft { grid-template-columns: 1fr; }
  .intro-opening__media { order: -1; }
  .intro-opening__media img { max-height: 470px; }
  .fragment-board { min-height: 420px; }
  .purpose-opening-media, .path-media, .system-media, .plot-reference-media, .floor-reference-media { width: 80%; }
  .purpose-archetypes { grid-template-columns: 1fr 1fr; }
  .archetype { min-height: 330px; }
  .purpose-comparison-media { order: -1; }
  .area-lab { grid-template-columns: 1fr 1fr; }
  .floor-opening-media { order: -1; }
}

@media (max-width: 760px) {
  :root { --header-h: 62px; --content: calc(100vw - 32px); }
  .course-header { gap: 12px; grid-template-columns: 1fr auto; padding: 7px 14px; }
  .course-header .wordmark { display: none; }
  .header-context { border-left: 0; padding-left: 0; }
  .header-context span { font-size: 8px; }
  .header-context strong { font-size: 13px; }
  .header-progress { display: none; }
  .mobile-map-toggle { align-items: center; background: transparent; border: 1px solid var(--line); border-radius: 999px; color: var(--ink); display: flex; font-size: 9px; font-weight: 750; gap: 8px; min-height: 37px; padding: 8px 12px; text-transform: uppercase; }
  .theme-floors .mobile-map-toggle { border-color: rgba(255,255,255,.18); color: white; }
  .mobile-map-toggle i { font-style: normal; transition: transform .2s ease; }
  .mobile-map-toggle[aria-expanded="true"] i { transform: rotate(180deg); }
  .scene-rail { align-items: stretch; border-radius: 16px 16px 0 0; bottom: 0; box-shadow: 0 -12px 40px rgba(19,38,67,.14); display: grid; gap: 4px; grid-template-columns: repeat(5, 1fr); left: 0; opacity: 0; padding: 12px 10px max(12px, env(safe-area-inset-bottom)); pointer-events: none; right: 0; top: auto; transform: translateY(15px); transition: opacity .2s ease, transform .2s ease; width: auto; }
  .scene-rail.is-open { opacity: 1; pointer-events: auto; transform: translateY(0); }
  .scene-rail > p, .rail-progress { display: none; }
  .scene-rail > a { min-height: 50px; }
  .scene-rail > a > i { height: 9px; width: 9px; }
  .scene-rail > a span { background: transparent; color: var(--ink); display: block; font-size: 8px; margin-top: 23px; opacity: 1; padding: 0; right: auto; transform: none; }
  .theme-floors .scene-rail > a span { color: white; }
  .scene-rail > a span::after { display: none; }
  .scene-rail > a span b { display: none; }
  .lesson-scene { min-height: calc(100svh - var(--header-h)); overflow: visible; padding: 72px 20px 88px; }
  .scene-next { bottom: 24px; right: 20px; }
  .scene-next span { display: none; }
  .scene-index { margin-bottom: 18px; }
  .review-header { padding: 22px 0; }
  .review-main { padding-top: 55px; }
  .review-grid { grid-template-columns: 1fr; }
  .review-card { min-height: 270px; }
  .intro-opening { gap: 35px; }
  .intro-opening__copy h1 { font-size: clamp(44px, 13vw, 58px); line-height: .98; }
  .hero-meta { align-items: start; flex-direction: column; }
  .intro-fragments { gap: 35px; }
  .fragment-title h2 { font-size: clamp(42px, 12.5vw, 56px); }
  .fragment-board { height: auto; min-height: 0; display: grid; gap: 9px; grid-template-columns: 1fr 1fr; }
  .fragment-board article { left: auto; padding: 18px; position: relative; top: auto; transform: none; width: auto; }
  .fragment-board article:last-child { grid-column: 1 / -1; }
  .fragment-principle { gap: 12px; grid-template-columns: 1fr; }
  .intro-path { gap: 40px; grid-template-columns: 1fr; }
  .path-media { width: 100%; }
  .intro-outcome { gap: 20px; grid-template-columns: 1fr; }
  .outcome-number { font-size: 130px; }
  .editorial-checklist li { gap: 8px; grid-template-columns: 1fr; }
  .primary-action { gap: 16px; grid-template-columns: auto auto; }
  .primary-action span { display: none; }
  .purpose-title h1, .plot-title h1, .floor-title h1 { font-size: clamp(42px, 11.8vw, 52px); line-height: 1; }
  .purpose-question { padding: 28px 23px; }
  .purpose-question blockquote { font-size: 37px; }
  .purpose-opening-media, .system-media, .plot-reference-media, .floor-reference-media { width: 100%; }
  .purpose-versus { grid-template-columns: 1fr; }
  .purpose-versus > div { transform: rotate(90deg); justify-self: center; }
  .purpose-archetypes { grid-template-columns: 1fr; }
  .archetype { min-height: 300px; }
  .purpose-cascade li { gap: 8px; grid-template-columns: 1fr; }
  .completion-panel { align-items: start; grid-template-columns: 1fr; }
  .area-lab { grid-template-columns: 1fr; margin-top: 45px; }
  .area-diagram { order: 2; }
  .area-readout { gap: 10px; }
  .area-readout dd { font-size: 21px; }
  .land-principle { gap: 10px; grid-template-columns: 1fr; }
  .open-area-list { gap: 25px; grid-template-columns: 1fr; }
  .open-area-list ul { grid-template-columns: 1fr; }
  .footprint-table-wrap { margin-left: -20px; margin-right: -20px; padding-left: 20px; }
  .plot-section-heading h2, .purpose-section-heading h2, .floor-system-heading h2 { font-size: clamp(39px, 10.8vw, 48px); line-height: 1.03; }
  .floor-equation { gap: 9px; }
  .floor-equation div { padding: 19px 10px; }
  .floor-equation strong { font-size: 38px; }
  .floor-answer { flex-direction: column; gap: 10px; }
  .floor-builder { grid-template-columns: 1fr; }
  .building-stack { height: 390px; }
  .floor-ledger { margin-left: -10px; margin-right: -10px; overflow-x: auto; }
  .floor-ledger > div { grid-template-columns: 115px 200px 130px; min-width: 500px; }
  .floor-notes { grid-template-columns: 1fr; }
  .target-builder { padding: 24px 19px; }
}

@media (max-width: 430px) {
  .lesson-scene { padding-left: 16px; padding-right: 16px; }
  .scene-next { right: 16px; }
  .review-main, .review-header { width: calc(100vw - 24px); }
  .review-card { grid-template-columns: 1fr; gap: 12px; padding: 25px; }
  .review-card h2 { margin-bottom: 24px; }
  .purpose-section-heading h2, .plot-section-heading h2, .floor-system-heading h2, .outcome-copy h2 { font-size: 39px; }
  .purpose-craft, .plot-craft, .floor-craft { gap: 35px; }
  .allocation-board button span { font-size: 17px; }
  .area-diagram__footprint span { font-size: 19px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}


/* ===== CHAPTER 1 COMPATIBILITY EXTENSIONS ===== */
/* Chapter 1 extensions for the approved ACE course design system. */

.theme-builtup {
  --paper: #f4f1e9;
  --paper-2: #e8edf1;
}

.theme-definition {
  --paper: #f6f2e9;
  --paper-2: #ebe5d9;
}

.review-card--builtup { --card-accent: #f45d22; background: #e9edf1; }
.review-card--definition { --card-accent: #ff8a58; background: #132643; color: white; }

.purpose-priority-matrix {
  background: rgba(255,255,255,.06);
  border-radius: 14px;
  color: rgba(255,255,255,.72);
  grid-column: 1 / -1;
  overflow: hidden;
}

.purpose-priority-matrix > div {
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,.09);
  display: grid;
  gap: 16px;
  grid-template-columns: 1.2fr 1fr 1fr;
  padding: 12px 18px;
}

.purpose-priority-matrix__head { background: rgba(255,255,255,.08); }
.purpose-priority-matrix strong { color: white; font-family: var(--serif); font-size: 15px; }
.purpose-priority-matrix span { color: inherit; font-size: 10px; letter-spacing: 0; text-transform: none; }
.purpose-priority-matrix__head span { color: #ef987b; font-size: 8px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.purpose-priority-matrix > p { font-size: 9px; margin: 0; padding: 11px 18px; }

.purpose-carry-list,
.floor-carry-list,
.plot-decision-sequence {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.purpose-carry-list li {
  border-bottom: 1px solid rgba(255,255,255,.25);
  display: grid;
  font-size: 11px;
  gap: 9px;
  grid-template-columns: 16px 1fr;
  line-height: 1.45;
  padding: 9px 0;
}

.purpose-carry-list li::before { color: var(--ink); content: "→"; font-weight: 750; }

.plot-decision-sequence { counter-reset: plot-step; }
.plot-decision-sequence li { align-items: start; border-bottom: 1px solid var(--line); color: var(--ink); counter-increment: plot-step; display: grid; font-size: 11px; gap: 12px; grid-template-columns: 25px 1fr; line-height: 1.45; padding: 9px 0; }
.plot-decision-sequence li::before { color: var(--orange-deep); content: counter(plot-step, decimal-leading-zero); font-family: var(--serif); font-size: 14px; }
.footprint-table-note { color: var(--muted); font-size: 9px; line-height: 1.5; margin: 12px 0 0; }

.floor-responsibilities {
  display: grid;
  gap: 9px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 34px;
}

.floor-responsibilities article { background: rgba(255,255,255,.66); border-radius: 12px; min-height: 145px; padding: 17px; }
.floor-responsibilities span { color: var(--orange-deep); font-size: 8px; font-weight: 750; letter-spacing: .09em; text-transform: uppercase; }
.floor-responsibilities p { color: var(--muted); font-size: 10px; line-height: 1.5; margin: 22px 0 0; }
.floor-system-media { margin: 28px auto 0; max-width: 100%; margin-top: 32px !important;}
.floor-system-media img { aspect-ratio: 21 / 8; object-fit: cover; width: 100%; }
.floor-carry-list li { border-bottom: 1px solid rgba(255,255,255,.12); color: #b6c0cd; display: grid; font-size: 10px; gap: 9px; grid-template-columns: 14px 1fr; line-height: 1.45; padding: 8px 0; }
.floor-carry-list li::before { color: var(--orange); content: "✓"; }
.floor-useful-question { border-left: 3px solid var(--orange); color: white; font-family: var(--serif); font-size: clamp(18px, 1.7vw, 24px); line-height: 1.3; margin: 24px 0 0; padding-left: 17px; }

.theme-builtup .lesson-scene,
.theme-definition .lesson-scene {
  min-height: calc(100vh - var(--header-h));
  min-height: calc(100svh - var(--header-h));
}

/* Lesson 1.4 — construction scale studio */
.builtup-chaos {
  align-items: center;
  background:
    linear-gradient(90deg, rgba(19, 38, 67, .045) 1px, transparent 1px) 0 0 / 54px 54px,
    linear-gradient(rgba(19, 38, 67, .045) 1px, transparent 1px) 0 0 / 54px 54px,
    var(--paper);
  display: grid;
  gap: 34px 70px;
  grid-template-columns: .9fr 1.1fr;
}

.builtup-opening h1 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(46px, 4.8vw, 72px);
  letter-spacing: -.034em;
  line-height: .98;
  margin: 0 0 28px;
  max-width: 700px;
}

.builtup-overline,
.definition-kicker {
  color: var(--orange-deep);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: .14em;
  margin: 0 0 18px;
  text-transform: uppercase;
}

.builtup-lead {
  color: #566274;
  font-size: clamp(16px, 1.35vw, 20px);
  line-height: 1.7;
  max-width: 590px;
}

.builtup-number-field {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.builtup-number-field article {
  background: rgba(255, 253, 248, .86);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  min-height: 250px;
  padding: 28px 24px;
  position: relative;
}

.builtup-number-field article::after {
  background: rgba(19, 38, 67, .1);
  bottom: 0;
  content: "";
  height: 5px;
  left: 0;
  position: absolute;
  width: 100%;
}

.builtup-number-field article.is-answer {
  background: var(--ink);
  color: white;
  transform: translateY(-20px);
}

.builtup-number-field article.is-answer::after { background: var(--orange); }
.builtup-number-field span { color: var(--muted); font-size: 9px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.builtup-number-field .is-answer span { color: #ff9c74; }
.builtup-number-field strong { color: var(--ink); font-family: var(--serif); font-size: clamp(37px, 3.4vw, 52px); line-height: 1; margin: auto 0 8px; }
.builtup-number-field .is-answer strong { color: white; }
.builtup-number-field small { color: var(--muted); font-size: 11px; }
.builtup-number-field .is-answer small { color: #c6cfdb; }

.builtup-definition {
  align-items: start;
  background: rgba(255, 253, 248, .85);
  border-radius: 15px;
  display: grid;
  gap: 13px 28px;
  grid-column: 1 / -1;
  grid-template-columns: 150px 1fr;
  padding: 24px 28px;
}

.builtup-definition > span { color: var(--orange-deep); font-size: 9px; font-weight: 750; letter-spacing: .12em; padding-top: 5px; text-transform: uppercase; }
.builtup-definition p { color: var(--ink); font-family: var(--serif); font-size: clamp(19px, 1.8vw, 26px); line-height: 1.28; margin: 0; }
.builtup-definition small { color: var(--muted); grid-column: 2; line-height: 1.6; }

.builtup-illusion {
  background: #e9edf1;
  display: grid;
  gap: 28px 48px;
  grid-template-columns: .82fr 1.18fr;
}

.builtup-heading { max-width: 880px; }
.builtup-heading h2,
.builtup-system-copy h2,
.builtup-exercise-copy h2 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(43px, 4.5vw, 66px);
  letter-spacing: -.032em;
  line-height: 1;
  margin: 0 0 26px;
}

.builtup-heading > p:last-child,
.builtup-system-copy > p,
.builtup-exercise-copy > p {
  color: #596576;
  font-size: 16px;
  line-height: 1.7;
}

.builtup-heading blockquote {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(36px, 4vw, 58px);
  letter-spacing: -.03em;
  line-height: 1.04;
  margin: 0 0 28px;
}

.builtup-compare {
  align-self: end;
  background: rgba(255, 255, 255, .74);
  border-radius: 16px;
  overflow: hidden;
}

.builtup-compare > div {
  align-items: center;
  border-bottom: 1px solid rgba(19, 38, 67, .09);
  display: grid;
  gap: 10px;
  grid-template-columns: 1.25fr .8fr .8fr;
  padding: 15px 18px;
}

.builtup-compare > div:last-child { border-bottom: 0; }
.builtup-compare__labels { background: var(--ink); color: white; }
.builtup-compare span { color: var(--muted); font-size: 10px; font-weight: 650; }
.builtup-compare b,
.builtup-compare strong { color: var(--ink); font-size: 11px; }
.builtup-compare__labels strong { color: white; }
.builtup-compare b.is-accent { color: var(--orange-deep); font-family: var(--serif); font-size: 22px; }
.builtup-compare .is-total { background: #fff8f2; }
.builtup-compare .is-total b:last-child { color: var(--orange-deep); font-family: var(--serif); font-size: 21px; }
.builtup-compare-media { grid-column: 2; grid-row: 1 / span 2; }
.builtup-compare-media img { aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }
.builtup-caption { color: var(--muted); font-size: 11px; grid-column: 2; line-height: 1.55; margin: -14px 0 0; }

.builtup-shift {
  background: var(--white);
  display: grid;
  gap: 38px 55px;
  grid-template-columns: 1.05fr .95fr;
}

.builtup-heading--compact { grid-column: 1 / -1; max-width: 940px; }
.area-methods { display: grid; gap: 14px; }
.area-method { border-radius: 17px; padding: 28px; }
.area-method--multiply { background: #fff0e7; }
.area-method--add { background: #edf0f4; }
.area-method > span { color: var(--orange-deep); font-size: 9px; font-weight: 750; letter-spacing: .11em; text-transform: uppercase; }
.area-method > p { color: var(--muted); font-size: 12px; line-height: 1.55; margin: 18px 0 0; }
.area-equation { align-items: end; display: grid; gap: 4px 11px; grid-template-columns: auto auto auto auto auto auto auto; margin-top: 24px; }
.area-equation b,
.area-equation strong { color: var(--ink); font-family: var(--serif); font-size: clamp(29px, 2.5vw, 40px); line-height: 1; }
.area-equation strong { color: var(--orange-deep); }
.area-equation i { color: var(--orange); font-style: normal; font-size: 22px; padding-bottom: 11px; }
.area-equation small { color: var(--muted); font-size: 8px; line-height: 1.3; max-width: 65px; }
.area-method ol { display: grid; gap: 8px; grid-template-columns: repeat(3, 1fr); list-style: none; margin: 22px 0 0; padding: 0; }
.area-method li { background: rgba(255,255,255,.7); border-radius: 10px; padding: 15px; }
.area-method li b { color: var(--ink); display: block; font-family: var(--serif); font-size: 27px; }
.area-method li small { color: var(--muted); font-size: 9px; }
.area-sum { align-items: end; display: flex; justify-content: space-between; margin-top: 17px; }
.area-sum span { color: var(--muted); font-size: 10px; }
.area-sum strong { color: var(--ink); font-family: var(--serif); font-size: 25px; }
.area-method-media img { aspect-ratio: 16 / 11; object-fit: cover; width: 100%; }
.builtup-question { align-items: center; background: var(--ink); border-radius: 14px; color: white; display: grid; gap: 20px; grid-column: 1 / -1; grid-template-columns: 160px 1fr; padding: 22px 28px; }
.builtup-question span { color: #ff956b; font-size: 9px; font-weight: 750; letter-spacing: .11em; text-transform: uppercase; }
.builtup-question p { font-family: var(--serif); font-size: clamp(20px, 2vw, 28px); margin: 0; }

.builtup-system {
  background: var(--ink);
  color: white;
  display: grid;
  gap: 30px 54px;
  grid-template-columns: .72fr 1.28fr;
}

.builtup-system .scene-index { color: #ff8d61; }
.builtup-system-copy h2 { color: white; }
.builtup-system-copy > p { color: #bdc7d4; }
.builtup-system-copy blockquote { border-left: 3px solid var(--orange); color: white; font-family: var(--serif); font-size: clamp(22px, 2.2vw, 31px); line-height: 1.3; margin: 32px 0 0; padding-left: 22px; }
.quantity-orbit { display: grid; gap: 9px; grid-template-columns: repeat(2, 1fr); }
.quantity-orbit article { background: rgba(255,255,255,.075); border-radius: 13px; min-height: 150px; padding: 20px; transition: background .25s ease, transform .25s ease; }
.quantity-orbit article:hover { background: rgba(255,255,255,.12); transform: translateY(-4px); }
.quantity-orbit article:last-child { grid-column: 1 / -1; min-height: 120px; }
.quantity-orbit span { color: #ff8d61; font-family: var(--serif); font-size: 17px; }
.quantity-orbit h3 { color: white; font-family: var(--serif); font-size: 23px; margin: 12px 0 7px; }
.quantity-orbit p { color: #bdc7d4; font-size: 11px; line-height: 1.55; margin: 0; }
.quantity-media { grid-column: 1 / -1; }
.quantity-media img { aspect-ratio: 21 / 8; object-fit: cover; width: 100%; }

.builtup-craft {
  background: #f0ece3;
  display: grid;
  gap: 38px 52px;
  grid-template-columns: .8fr 1.2fr;
}

.builtup-craft .builtup-heading { max-width: 590px; }
.area-language { display: grid; gap: 10px; grid-template-columns: repeat(3, 1fr); }
.area-language article { background: var(--white); border-radius: 15px; min-height: 240px; padding: 25px; position: relative; }
.area-language article.is-primary { background: var(--orange); color: white; transform: translateY(-18px); }
.area-language span { color: var(--orange-deep); font-size: 9px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.area-language .is-primary span { color: var(--ink); }
.area-language h3 { color: var(--ink); font-family: var(--serif); font-size: 27px; margin: 58px 0 12px; }
.area-language .is-primary h3 { color: white; }
.area-language p { color: var(--muted); font-size: 12px; line-height: 1.55; }
.area-language .is-primary p { color: white; }
.builtup-checklist { align-self: start; background: var(--white); border-radius: 16px; grid-column: 1 / -1; list-style: none; margin: 0; padding: 18px 28px; }
.builtup-checklist li { align-items: start; border-bottom: 1px solid var(--line); color: var(--ink); display: grid; font-size: 13px; gap: 14px; grid-template-columns: 22px 1fr; padding: 14px 0; }
.builtup-checklist li:last-child { border-bottom: 0; }
.builtup-checklist li::before { color: var(--orange); content: "✓"; font-weight: 750; }

.builtup-exercise {
  background: #e8edf1;
  display: grid;
  gap: 42px 62px;
  grid-template-columns: .78fr 1.22fr;
}

.builtup-principle { background: var(--ink); border-radius: 13px; color: white; margin-top: 35px; padding: 21px; }
.builtup-principle span { color: #ff9166; font-size: 9px; font-weight: 750; letter-spacing: .11em; text-transform: uppercase; }
.builtup-principle p { font-family: var(--serif); font-size: 22px; line-height: 1.28; margin: 9px 0 0; }
.builtup-calculator { background: var(--white); border-radius: 18px; padding: clamp(28px, 4vw, 48px); }
.calculator-inputs { align-items: end; display: grid; gap: 18px; grid-template-columns: 1fr auto 1fr; }
.calculator-inputs > i { color: var(--orange); font-family: var(--serif); font-size: 30px; font-style: normal; padding-bottom: 16px; }
.calculator-inputs label { display: grid; gap: 8px; position: relative; }
.calculator-inputs label > span { color: var(--muted); font-size: 9px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.calculator-inputs input,
.calculator-inputs select { background: #f1eee7; border: 0; border-radius: 10px; color: var(--ink); font-family: var(--serif); font-size: 26px; min-height: 62px; padding: 12px 16px; width: 100%; }
.calculator-inputs label > small { bottom: 21px; color: var(--muted); font-size: 9px; position: absolute; right: 14px; }
.calculator-result { align-items: end; background: var(--orange); border-radius: 14px; color: white; display: grid; gap: 5px 14px; grid-template-columns: 1fr auto auto; margin-top: 22px; padding: 22px 24px; }
.calculator-result span { font-size: 10px; font-weight: 700; letter-spacing: .08em; padding-bottom: 6px; text-transform: uppercase; }
.calculator-result strong { font-family: var(--serif); font-size: 42px; line-height: .9; }
.calculator-result small { padding-bottom: 5px; }
.builtup-calculator fieldset { border: 0; margin: 32px 0 0; padding: 0; }
.builtup-calculator legend { color: var(--ink); font-family: var(--serif); font-size: 23px; margin-bottom: 15px; }
.builtup-calculator fieldset button { background: transparent; border: 1px solid rgba(19,38,67,.16); border-radius: 10px; color: var(--ink); cursor: pointer; display: block; margin-top: 8px; padding: 13px 15px; text-align: left; transition: background .2s ease, color .2s ease; width: 100%; }
.builtup-calculator fieldset button:hover { background: #edf0f4; }
.builtup-calculator fieldset button.is-correct { background: var(--ink); color: white; }
.builtup-calculator fieldset button.is-wrong { background: #fff0e7; color: var(--orange-deep); }
.builtup-calculator > p { color: var(--muted); font-size: 11px; margin: 15px 0 0; }
.builtup-exercise .completion-panel { grid-column: 1 / -1; }

/* Lesson 1.5 — editorial synthesis */
.definition-chaos {
  align-items: center;
  background: var(--paper);
  display: grid;
  gap: 42px 70px;
  grid-template-columns: .95fr 1.05fr;
}

.definition-opening h1 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(47px, 5vw, 74px);
  letter-spacing: -.036em;
  line-height: .97;
  margin: 0 0 28px;
}

.definition-opening > p:last-of-type { color: #586475; font-size: 17px; line-height: 1.7; max-width: 600px; }
.definition-fragments { height: 390px; position: relative; }
.definition-fragments > span { background: var(--white); border-radius: 13px; box-shadow: 0 22px 55px rgba(19,38,67,.08); color: var(--ink); font-family: var(--serif); font-size: clamp(22px, 2.2vw, 31px); left: var(--x); padding: 21px 24px; position: absolute; top: var(--y); transform: rotate(var(--r)); transition: transform .25s ease; }
.definition-fragments > span:hover { transform: rotate(0) translateY(-6px); }
.definition-fragments small { color: var(--muted); display: block; font-family: var(--sans); font-size: 8px; font-weight: 700; letter-spacing: .09em; margin-top: 6px; text-transform: uppercase; }
.definition-reality { align-items: start; background: var(--ink); border-radius: 15px; color: white; display: grid; gap: 24px; grid-column: 1 / -1; grid-template-columns: 170px 1fr; padding: 25px 29px; }
.definition-reality span { color: #ff9167; font-size: 9px; font-weight: 750; letter-spacing: .11em; padding-top: 5px; text-transform: uppercase; }
.definition-reality p { font-family: var(--serif); font-size: clamp(18px, 1.7vw, 25px); line-height: 1.35; margin: 0; }

.definition-illusion {
  background: #ece6db;
  display: grid;
  gap: 42px 58px;
  grid-template-columns: .72fr 1.28fr;
}

.definition-heading h2,
.definition-system-copy h2,
.classification-copy h2 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(43px, 4.5vw, 66px);
  letter-spacing: -.032em;
  line-height: 1;
  margin: 0 0 27px;
}

.definition-heading > p:last-child,
.definition-system-copy > p,
.classification-copy > p { color: #5a6676; font-size: 16px; line-height: 1.7; }
.missing-context { display: grid; gap: 10px; grid-template-columns: repeat(2, 1fr); }
.missing-context article { background: var(--white); border-radius: 15px; min-height: 190px; padding: 24px; transition: transform .25s ease; }
.missing-context article:hover { transform: translateY(-5px); }
.missing-context strong { color: var(--ink); display: block; font-family: var(--serif); font-size: 25px; }
.missing-context span { color: var(--orange-deep); display: block; font-size: 8px; font-weight: 750; letter-spacing: .12em; margin: 30px 0 8px; text-transform: uppercase; }
.missing-context p { color: var(--muted); font-size: 12px; line-height: 1.55; margin: 0; }
.definition-quote { border-left: 3px solid var(--orange); color: var(--ink); font-family: var(--serif); font-size: clamp(24px, 2.7vw, 38px); grid-column: 1 / -1; line-height: 1.25; margin: 0; padding: 8px 0 8px 25px; }

.definition-shift {
  background: var(--white);
  display: grid;
  gap: 34px 50px;
  grid-template-columns: 1fr 1fr;
}

.definition-heading--compact { grid-column: 1 / -1; max-width: 930px; }
.before-after { align-items: stretch; display: grid; gap: 18px; grid-column: 1 / -1; grid-template-columns: .7fr auto 1.3fr; }
.before-after > i { align-self: center; color: var(--orange); font-size: 26px; font-style: normal; }
.before-after article { border-radius: 15px; padding: 25px 28px; }
.before-after__before { background: #f0ece4; }
.before-after__after { background: var(--ink); color: white; }
.before-after span { color: var(--orange-deep); font-size: 8px; font-weight: 750; letter-spacing: .11em; text-transform: uppercase; }
.before-after__after span { color: #ff9368; }
.before-after p { color: var(--ink); font-family: var(--serif); font-size: clamp(19px, 1.8vw, 26px); line-height: 1.35; margin: 18px 0 0; }
.before-after__after p { color: white; }
.definition-statement-media img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; }
.definition-summary { display: grid; gap: 10px; grid-template-columns: repeat(2, 1fr); }
.definition-summary article { background: #f0ece4; border-radius: 12px; padding: 18px 20px; }
.definition-summary span { color: var(--orange-deep); display: block; font-size: 8px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.definition-summary strong { color: var(--ink); display: block; font-family: var(--serif); font-size: 23px; margin-top: 12px; }

.definition-system {
  background: #e9edf1;
  display: grid;
  gap: 38px 55px;
  grid-template-columns: .72fr 1.28fr;
}

.definition-jobs { counter-reset: none; list-style: none; margin: 0; padding: 0; }
.definition-jobs li { align-items: center; border-top: 1px solid rgba(19,38,67,.15); display: grid; gap: 25px; grid-template-columns: 110px 1fr; padding: 19px 0; transition: padding-left .22s ease; }
.definition-jobs li:hover { padding-left: 10px; }
.definition-jobs span { color: var(--orange-deep); font-size: 9px; font-weight: 750; letter-spacing: .09em; text-transform: uppercase; }
.definition-jobs p { color: var(--ink); font-family: var(--serif); font-size: 22px; margin: 0; }
.definition-system-media { grid-column: 1 / -1; }
.definition-system-media img { aspect-ratio: 21 / 8; object-fit: cover; width: 100%; }

.definition-craft {
  background: var(--ink);
  color: white;
  display: grid;
  gap: 35px 52px;
  grid-template-columns: .78fr 1.22fr;
}

.definition-craft .scene-index { color: #ff9168; }
.definition-craft .definition-heading h2 { color: white; }
.definition-craft .definition-heading > p:last-child { color: #c0cad6; }
.certainty-ledger { display: grid; gap: 8px; }
.certainty-ledger article { align-items: center; background: rgba(255,255,255,.075); border-radius: 12px; display: grid; gap: 20px; grid-template-columns: 150px 1fr; padding: 16px 19px; }
.certainty-ledger span { color: #ff9168; font-size: 9px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.certainty-ledger p { color: white; font-family: var(--serif); font-size: 17px; line-height: 1.35; margin: 0; }
.certainty-media { grid-column: 1; }
.certainty-media img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; }
.chapter-takeaways { align-self: stretch; background: var(--orange); border-radius: 15px; color: white; padding: 27px; }
.chapter-takeaways > p { color: var(--ink); font-size: 9px; font-weight: 750; letter-spacing: .1em; margin: 0 0 20px; text-transform: uppercase; }
.chapter-takeaways ul { list-style: none; margin: 0; padding: 0; }
.chapter-takeaways li { align-items: start; border-bottom: 1px solid rgba(255,255,255,.27); display: grid; font-size: 12px; gap: 11px; grid-template-columns: 18px 1fr; line-height: 1.5; padding: 11px 0; }
.chapter-takeaways li:last-child { border-bottom: 0; }
.chapter-takeaways li::before { content: "✓"; font-weight: 750; }

.definition-exercise {
  background: #f0ece4;
  display: grid;
  gap: 40px 60px;
  grid-template-columns: .7fr 1.3fr;
}

.classification-board { background: var(--white); border-radius: 18px; display: grid; gap: 10px; padding: clamp(25px, 4vw, 43px); }
.classification-board label { align-items: center; background: #f1eee7; border-radius: 11px; display: grid; gap: 18px; grid-template-columns: 1fr 190px; padding: 13px 15px; }
.classification-board label > span { color: var(--ink); font-family: var(--serif); font-size: 19px; }
.classification-board select { background: white; border: 1px solid rgba(19,38,67,.12); border-radius: 8px; color: var(--ink); min-height: 42px; padding: 8px 10px; width: 100%; }
.classification-board label.is-correct { background: #e5efe9; }
.classification-board label.is-wrong { background: #fff0e7; }
.classification-board > button { align-items: center; background: var(--orange); border: 0; border-radius: 10px; color: white; cursor: pointer; display: flex; font-weight: 700; justify-content: space-between; margin-top: 8px; min-height: 50px; padding: 13px 17px; }
.classification-board > button i { font-style: normal; transition: transform .2s ease; }
.classification-board > button:hover i { transform: translateX(5px); }
.classification-board > p { color: var(--muted); font-size: 11px; margin: 3px 0 0; }
.definition-exercise .completion-panel { grid-column: 1 / -1; }

@media (max-width: 980px) {
  .builtup-chaos,
  .builtup-illusion,
  .builtup-shift,
  .builtup-system,
  .builtup-craft,
  .builtup-exercise,
  .definition-chaos,
  .definition-illusion,
  .definition-shift,
  .definition-system,
  .definition-craft,
  .definition-exercise { grid-template-columns: 1fr; }

  .builtup-compare-media,
  .builtup-caption,
  .quantity-media,
  .builtup-checklist,
  .builtup-exercise .completion-panel,
  .definition-heading--compact,
  .before-after,
  .definition-system-media,
  .certainty-media,
  .definition-exercise .completion-panel { grid-column: 1; grid-row: auto; }

  .builtup-number-field article.is-answer,
  .area-language article.is-primary { transform: none; }
  .quantity-media img,
  .definition-system-media img { aspect-ratio: 16 / 9; }
  .floor-responsibilities { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 680px) {
  .builtup-definition,
  .builtup-question,
  .definition-reality { grid-template-columns: 1fr; }
  .builtup-definition small { grid-column: 1; }
  .builtup-number-field,
  .area-language,
  .missing-context,
  .definition-summary { grid-template-columns: 1fr; }
  .builtup-number-field article { min-height: 165px; }
  .builtup-number-field strong { margin-top: 48px; }
  .builtup-compare > div { grid-template-columns: 1.1fr .9fr .9fr; padding: 13px 11px; }
  .builtup-compare span,
  .builtup-compare b,
  .builtup-compare strong { font-size: 9px; }
  .area-equation { grid-template-columns: auto 1fr; }
  .area-equation i { display: none; }
  .area-method ol { grid-template-columns: 1fr; }
  .quantity-orbit { grid-template-columns: 1fr; }
  .quantity-orbit article:last-child { grid-column: 1; }
  .calculator-inputs { grid-template-columns: 1fr; }
  .calculator-inputs > i { padding: 0; text-align: center; }
  .calculator-result { grid-template-columns: 1fr auto; }
  .calculator-result span { grid-column: 1 / -1; }
  .definition-fragments { height: 520px; }
  .definition-fragments > span { left: min(var(--x), 56%); }
  .before-after { grid-template-columns: 1fr; }
  .before-after > i { transform: rotate(90deg); }
  .certainty-ledger article,
  .classification-board label { grid-template-columns: 1fr; }
  .classification-board label { gap: 10px; }
  .floor-responsibilities { grid-template-columns: 1fr; }
  .floor-system-media img { aspect-ratio: 4 / 3; }
  .purpose-priority-matrix > div { gap: 8px; grid-template-columns: 1.15fr 1fr 1fr; padding: 11px 10px; }
  .purpose-priority-matrix strong { font-size: 12px; }
  .purpose-priority-matrix span { font-size: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .builtup-number-field article.is-answer,
  .area-language article.is-primary,
  .definition-fragments > span,
  .quantity-orbit article,
  .missing-context article { transform: none; transition: none; }
}


/* ===== CANONICAL STRUCTURE DESIGN SYSTEM (APPROVED CHAPTER 2) ===== */
/* Chapter 2 — Structure. Uses only ACE navy, orange, mineral blue and warm paper. */

.theme-structure {
  --structure-paper: #f6f3ec;
  --structure-paper-blue: #eaf0f4;
  --structure-navy: #102643;
  --structure-orange: #f45d22;
  --structure-orange-soft: #ffede4;
  --structure-blue: #496c8a;
  --structure-muted: #667385;
  background: var(--structure-paper);
  color: var(--structure-navy);
}

.theme-structure .lesson-scene {
  min-height: calc(100vh - var(--header-h));
  min-height: calc(100svh - var(--header-h));
  padding-bottom: max(54px, env(safe-area-inset-bottom));
  scroll-margin-top: var(--header-h);
}

.structure-opening,
.structure-copy,
.structure-closing { max-width: 720px; }

.structure-kicker {
  color: var(--structure-orange);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: .15em;
  margin: 0 0 18px;
  text-transform: uppercase;
}

.structure-opening h1,
.structure-copy h2,
.structure-closing h2 {
  color: var(--structure-navy);
  font-family: var(--serif);
  font-size: clamp(38px, 4.4vw, 64px);
  letter-spacing: -.035em;
  line-height: 1.02;
  margin: 0 0 24px;
}

.structure-opening h1 { font-size: clamp(43px, 5vw, 70px); }
.structure-opening > p:not(.scene-index):not(.structure-kicker),
.structure-copy > p,
.structure-closing > p {
  color: var(--structure-muted);
  font-size: clamp(15px, 1.25vw, 18px);
  line-height: 1.72;
}

.structure-hero {
  align-items: center;
  background:
    linear-gradient(90deg, rgba(16,38,67,.045) 1px, transparent 1px) 0 0 / 46px 46px,
    linear-gradient(rgba(16,38,67,.045) 1px, transparent 1px) 0 0 / 46px 46px,
    var(--structure-paper);
  display: grid;
  gap: 50px;
  grid-template-columns: minmax(0,.9fr) minmax(340px,1.1fr);
}

.structure-hero--reverse { grid-template-columns: minmax(340px,1.1fr) minmax(0,.9fr); }
.structure-hero--reverse .structure-opening { order: 2; }

.structure-hero-media,
.structure-inline-media { margin: 0; }
.structure-hero-media img,
.structure-inline-media img {
  border: 0 !important;
  border-radius: 18px;
  box-shadow: none !important;
  display: block;
  height: auto;
  max-width: 100%;
  outline: 0 !important;
  width: 100%;
}
.structure-hero-media img { aspect-ratio: 4 / 3; object-fit: cover; }
.structure-inline-media figcaption { color: var(--structure-muted); font-size: 10px; line-height: 1.55; margin-top: 11px; }

.structure-signal {
  background: var(--structure-navy);
  border-radius: 16px;
  color: white;
  margin-top: 28px;
  padding: 22px 24px;
}
.structure-signal span { color: #ff9b73; font-size: 9px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.structure-signal p { font-family: var(--serif); font-size: clamp(19px, 1.8vw, 26px); line-height: 1.3; margin: 9px 0 0; }

.structure-terms {
  align-items: start;
  background: var(--structure-paper-blue);
  display: grid;
  gap: 42px 62px;
  grid-template-columns: minmax(270px,.75fr) minmax(0,1.25fr);
}

.structure-term-grid,
.structure-option-grid,
.structure-question-grid,
.structure-stat-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0,1fr));
}

.structure-term-grid article,
.structure-option-grid article,
.structure-question-grid article,
.structure-stat-grid article {
  background: rgba(255,255,255,.75);
  border-radius: 15px;
  min-height: 150px;
  padding: 22px;
}
.structure-term-grid span,
.structure-option-grid span,
.structure-question-grid span,
.structure-stat-grid span {
  color: var(--structure-orange);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.structure-term-grid h3,
.structure-option-grid h3,
.structure-question-grid h3,
.structure-stat-grid h3 {
  color: var(--structure-navy);
  font-family: var(--serif);
  font-size: clamp(19px,1.7vw,25px);
  line-height: 1.15;
  margin: 28px 0 9px;
}
.structure-term-grid p,
.structure-option-grid p,
.structure-question-grid p,
.structure-stat-grid p { color: var(--structure-muted); font-size: 11px; line-height: 1.55; margin: 0; }

.structure-compare {
  background: var(--structure-navy);
  color: white;
  display: grid;
  gap: 42px 60px;
  grid-template-columns: minmax(250px,.7fr) minmax(0,1.3fr);
}
.structure-compare .scene-index,
.structure-compare .structure-copy h2 { color: white; }
.structure-compare .structure-copy > p { color: #b9c5d3; }

.structure-option-grid article { background: rgba(255,255,255,.07); }
.structure-option-grid h3 { color: white; }
.structure-option-grid p { color: #c0cad6; }
.structure-option-grid strong { color: #ff9b73; display: block; font-size: 9px; letter-spacing: .08em; margin-top: 14px; text-transform: uppercase; }

.structure-watch {
  background: var(--structure-paper);
  display: grid;
  gap: 36px 64px;
  grid-template-columns: minmax(0,1.05fr) minmax(280px,.95fr);
}
.structure-watch-card {
  background: white;
  border-radius: 18px;
  padding: 30px;
}
.structure-watch-card > span { color: var(--structure-orange); font-size: 9px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.structure-watch-card blockquote { color: var(--structure-navy); font-family: var(--serif); font-size: clamp(24px,2.5vw,36px); line-height: 1.18; margin: 18px 0 26px; }
.structure-watch-list { list-style: none; margin: 0; padding: 0; }
.structure-watch-list li { border-top: 1px solid rgba(16,38,67,.1); color: var(--structure-muted); display: grid; font-size: 12px; gap: 11px; grid-template-columns: 20px 1fr; line-height: 1.5; padding: 13px 0; }
.structure-watch-list li::before { color: var(--structure-orange); content: "→"; font-weight: 750; }

.structure-exercise {
  align-items: center;
  background: var(--structure-paper-blue);
  display: grid;
  gap: 48px 66px;
  grid-template-columns: minmax(270px,.8fr) minmax(0,1.2fr);
}

.structure-activity {
  background: white;
  border-radius: 20px;
  padding: clamp(24px,3vw,42px);
}
.structure-activity fieldset { border: 0; margin: 0; padding: 0; }
.structure-activity legend,
.structure-activity > h3 { color: var(--structure-navy); font-family: var(--serif); font-size: clamp(23px,2.2vw,32px); line-height: 1.2; margin: 0 0 24px; }
.structure-choice-grid { display: grid; gap: 10px; grid-template-columns: repeat(2,minmax(0,1fr)); }
.structure-choice-grid button,
.structure-activity button[data-structure-check] {
  background: #eef2f5;
  border: 0;
  border-radius: 12px;
  color: var(--structure-navy);
  cursor: pointer;
  font: 650 12px/1.35 var(--sans);
  min-height: 56px;
  padding: 14px 16px;
  text-align: left;
  transition: background .25s ease, color .25s ease, transform .25s ease;
}
.structure-choice-grid button:hover,
.structure-activity button[data-structure-check]:hover { transform: translateY(-2px); }
.structure-choice-grid button.is-correct { background: var(--structure-navy); color: white; }
.structure-choice-grid button.is-wrong { background: var(--structure-orange-soft); color: #8e3414; }
.structure-feedback { color: var(--structure-muted); font-size: 11px; line-height: 1.55; margin: 16px 0 0; min-height: 34px; }

.structure-checks { display: grid; gap: 9px; }
.structure-checks label { align-items: center; background: #eef2f5; border-radius: 12px; color: var(--structure-navy); cursor: pointer; display: grid; font-size: 12px; gap: 12px; grid-template-columns: 20px 1fr; padding: 14px; }
.structure-checks input { accent-color: var(--structure-orange); height: 17px; width: 17px; }
.structure-activity button[data-structure-check] { background: var(--structure-orange); color: white; margin-top: 14px; text-align: center; width: 100%; }

.structure-match { display: grid; gap: 10px; }
.structure-match label { align-items: center; background: #eef2f5; border-radius: 12px; display: grid; gap: 12px; grid-template-columns: minmax(0,1fr) minmax(150px,.7fr); padding: 12px 14px; }
.structure-match label > span { color: var(--structure-navy); font-size: 12px; font-weight: 650; }
.structure-match select,
.structure-calculator input,
.structure-calculator select {
  background: white;
  border: 1px solid rgba(16,38,67,.14);
  border-radius: 9px;
  color: var(--structure-navy);
  font: 600 12px var(--sans);
  min-height: 42px;
  padding: 8px 10px;
  width: 100%;
}
.structure-match label.is-correct { background: #dfeaec; }
.structure-match label.is-wrong { background: var(--structure-orange-soft); }

.structure-slider { margin: 26px 0; }
.structure-slider input { accent-color: var(--structure-orange); width: 100%; }
.structure-slider__readout { align-items: baseline; display: flex; gap: 10px; margin-top: 12px; }
.structure-slider__readout strong { color: var(--structure-navy); font-family: var(--serif); font-size: 44px; }
.structure-slider__readout span { color: var(--structure-muted); font-size: 12px; }
.structure-impact-bars { display: grid; gap: 9px; }
.structure-impact-bars div { align-items: center; display: grid; gap: 10px; grid-template-columns: 110px 1fr; }
.structure-impact-bars span { color: var(--structure-muted); font-size: 10px; }
.structure-impact-bars i { background: var(--structure-orange); border-radius: 20px; display: block; height: 8px; transform-origin: left; transition: width .35s ease; }

.structure-calculator { display: grid; gap: 12px; grid-template-columns: repeat(2,minmax(0,1fr)); }
.structure-calculator label span { color: var(--structure-muted); display: block; font-size: 9px; font-weight: 700; letter-spacing: .08em; margin-bottom: 7px; text-transform: uppercase; }
.structure-calculator__result { background: var(--structure-navy); border-radius: 13px; color: white; grid-column: 1 / -1; padding: 20px; }
.structure-calculator__result span { color: #ff9b73; display: block; font-size: 9px; letter-spacing: .1em; text-transform: uppercase; }
.structure-calculator__result strong { display: block; font-family: var(--serif); font-size: 38px; margin-top: 6px; }

.structure-intro-hero {
  align-items: end;
  background: var(--structure-navy);
  color: white;
  display: grid;
  gap: 42px;
  grid-template-columns: minmax(0,.75fr) minmax(360px,1.25fr);
}
.structure-intro-hero h1 { color: white; font-family: var(--serif); font-size: clamp(46px,5.5vw,76px); letter-spacing: -.04em; line-height: .96; margin: 0 0 24px; }
.structure-intro-hero p { color: #bec9d5; font-size: clamp(15px,1.25vw,18px); line-height: 1.7; }
.structure-intro-hero .structure-hero-media img { aspect-ratio: 16 / 10; }
.structure-index-grid { display: grid; gap: 10px; grid-template-columns: repeat(3,minmax(0,1fr)); }
.structure-index-grid a { background: white; border-radius: 14px; color: var(--structure-navy); min-height: 150px; padding: 20px; text-decoration: none; transition: transform .25s ease, background .25s ease; }
.structure-index-grid a:hover { background: var(--structure-orange-soft); transform: translateY(-3px); }
.structure-index-grid span { color: var(--structure-orange); font-size: 10px; font-weight: 750; }
.structure-index-grid strong { display: block; font-family: var(--serif); font-size: 20px; line-height: 1.15; margin-top: 34px; }
.structure-index-grid a:nth-child(4n + 2) { background: #eaf0f4; }
.structure-index-grid a:nth-child(4n + 3) { background: #ffede4; }
.structure-index-grid a:nth-child(4n + 4) { background: #102643; color: white; }
.structure-index-grid a:nth-child(4n + 4) span { color: #ff9b73; }
.structure-index-grid a:nth-child(4n + 5) { background: #f0ece3; }

.structure-check-page .structure-option-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }

@media (max-width: 980px) {
  .structure-hero,
  .structure-hero--reverse,
  .structure-terms,
  .structure-compare,
  .structure-watch,
  .structure-exercise,
  .structure-intro-hero { grid-template-columns: 1fr; }
  .structure-hero--reverse .structure-opening { order: 0; }
  .structure-hero-media { max-width: 760px; }
  .structure-check-page .structure-option-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 680px) {
  .structure-term-grid,
  .structure-option-grid,
  .structure-question-grid,
  .structure-stat-grid,
  .structure-choice-grid,
  .structure-index-grid,
  .structure-check-page .structure-option-grid { grid-template-columns: 1fr; }
  .structure-term-grid article,
  .structure-option-grid article,
  .structure-question-grid article,
  .structure-stat-grid article { min-height: 0; }
  .structure-match label { grid-template-columns: 1fr; }
  .structure-calculator { grid-template-columns: 1fr; }
  .structure-impact-bars div { grid-template-columns: 86px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .structure-index-grid a,
  .structure-choice-grid button,
  .structure-impact-bars i { scroll-behavior: auto; transition: none; }
}

/* --------------------------------------------------------------------------
   Four-template rotation
   1 = blueprint / analytical
   2 = editorial / gallery
   3 = vertical systems / night
   4 = specification lab / bento
   -------------------------------------------------------------------------- */

/* Shared proportion corrections: scenes remain at least a viewport but their
   internal cards and media are no longer stretched to arbitrary equal heights. */
.theme-structure .lesson-scene {
  align-content: center;
  grid-auto-rows: max-content;
  padding-bottom: max(58px, env(safe-area-inset-bottom));
  padding-top: clamp(54px, 6vw, 92px);
}

.structure-term-grid article,
.structure-option-grid article,
.structure-question-grid article,
.structure-stat-grid article { align-self: start; height: auto; min-height: 0; }

.structure-term-grid,
.structure-option-grid,
.structure-question-grid,
.structure-stat-grid { align-self: start; grid-auto-rows: max-content; }

.structure-hero-media,
.structure-inline-media,
.structure-watch-card,
.structure-activity { align-self: center; }

.structure-hero-media img {
  aspect-ratio: auto;
  max-height: min(60svh, 650px);
  object-fit: contain;
}

.structure-inline-media { max-width: 860px; }
.structure-inline-media img { max-height: min(52svh, 560px); object-fit: contain; }
.structure-hero > .structure-signal { grid-column: 1 / -1; margin-top: 0; max-width: 780px; }
.structure-hero > .structure-inline-media { grid-column: 1 / -1; justify-self: center; margin-top: 4px; width: min(100%, 880px); }
.structure-exercise > .completion-panel { grid-column: 1 / -1; margin-top: 0; }
.structure-copy > p:last-child,
.structure-opening > p:last-child { margin-bottom: 0; }

/* Template 1 — analytical blueprint. A controlled grid, numeric cards and a
   dark comparison board. Used by lessons 2.1, 2.5 and 2.9. */
.structure-template-1 .structure-hero {
  background:
    linear-gradient(90deg, rgba(16,38,67,.05) 1px, transparent 1px) 0 0 / 38px 38px,
    linear-gradient(rgba(16,38,67,.05) 1px, transparent 1px) 0 0 / 38px 38px,
    #f7f4ed;
  gap: 40px 58px;
  grid-template-columns: minmax(0,.88fr) minmax(360px,1.12fr);
}
.structure-template-1 .structure-opening { max-width: 620px; }
.structure-template-1 .structure-opening h1 { font-size: clamp(42px,4.6vw,66px); }
.structure-template-1 .structure-stat-grid article { background: rgba(255,255,255,.82); padding: 20px; }
.structure-template-1 .structure-terms { background: #eaf0f4; }
.structure-template-1 .structure-compare { background: #102643; }
.structure-template-1 .structure-watch-card { box-shadow: inset 4px 0 0 #f45d22; }
.structure-template-1 .structure-exercise { background: #eaf0f4; }

/* Template 2 — editorial gallery. A narrow reading column, larger isolated
   image, four-column option strip and dark quotation panel. */
.structure-template-2 { --structure-paper: #fbf8f1; --structure-paper-blue: #f1ede4; }
.structure-template-2 .structure-hero {
  align-items: center;
  background: #fbf8f1;
  gap: 34px 72px;
  grid-template-columns: minmax(0,1.08fr) minmax(330px,.92fr);
}
.structure-template-2 .structure-hero::before {
  background: #f45d22;
  content: "";
  height: 6px;
  left: max(96px, calc((100vw - 1220px) / 2));
  position: absolute;
  top: 0;
  width: 84px;
}
.structure-template-2 .structure-hero--reverse { grid-template-columns: minmax(0,1.08fr) minmax(330px,.92fr); }
.structure-template-2 .structure-hero--reverse .structure-opening { order: 0; }
.structure-template-2 .structure-opening { max-width: 700px; }
.structure-template-2 .structure-opening h1 { font-size: clamp(40px,4.25vw,60px); line-height: 1.04; }
.structure-template-2 .structure-hero-media { justify-self: end; width: min(100%, 560px); }
.structure-template-2 .structure-hero-media img { border-radius: 34px 10px 34px 10px; }
.structure-template-2 .structure-terms {
  background: #f0ece3;
  display: block;
}
.structure-template-2 .structure-terms .structure-copy { max-width: 860px; }
.structure-template-2 .structure-term-grid { grid-template-columns: repeat(4,minmax(0,1fr)); margin-top: 42px; }
.structure-template-2 .structure-term-grid article { background: transparent; border-top: 2px solid rgba(16,38,67,.16); border-radius: 0; padding: 20px 4px 4px; }
.structure-template-2 .structure-term-grid h3 { margin-top: 42px; }
.structure-template-2 .structure-compare {
  background: #f45d22;
  display: block;
}
.structure-template-2 .structure-compare .structure-copy { max-width: 850px; }
.structure-template-2 .structure-compare .structure-copy > p { color: rgba(255,255,255,.76); }
.structure-template-2 .structure-option-grid { grid-template-columns: repeat(4,minmax(0,1fr)); margin-top: 44px; }
.structure-template-2 .structure-option-grid article { background: rgba(16,38,67,.94); padding: 23px 20px; }
.structure-template-2 .structure-watch { background: #fbf8f1; grid-template-columns: minmax(0,.9fr) minmax(350px,1.1fr); }
.structure-template-2 .structure-watch-card { background: #102643; color: white; padding: clamp(28px,3.4vw,48px); }
.structure-template-2 .structure-watch-card blockquote { color: white; }
.structure-template-2 .structure-watch-card > span { color: #ff9b73; }
.structure-template-2 .structure-watch-list li { border-color: rgba(255,255,255,.12); color: #c2ccd7; }
.structure-template-2 .structure-exercise { background: #eaf0f4; grid-template-columns: minmax(0,1fr) minmax(400px,.95fr); }

/* Template 3 — vertical systems story. Dark opening, light system ledger,
   pale comparison field and orange watch panel. */
.structure-template-3 .course-header { background: rgba(16,38,67,.96); border-bottom-color: rgba(255,255,255,.1); }
.structure-template-3 .wordmark,
.structure-template-3 .header-context strong,
.structure-template-3 .header-progress b { color: white; }
.structure-template-3 .header-context { border-left-color: rgba(255,255,255,.16); }
.structure-template-3 .header-context span { color: #9fb0c2; }
.structure-template-3 .header-progress > span { background: rgba(255,255,255,.14); }
.structure-template-3 .structure-hero {
  background: #102643;
  color: white;
  gap: 46px 66px;
  grid-template-columns: minmax(0,.72fr) minmax(390px,1.28fr);
}
.structure-template-3 .structure-opening h1 { color: white; font-size: clamp(43px,4.8vw,68px); }
.structure-template-3 .structure-opening > p:not(.scene-index):not(.structure-kicker) { color: #b8c5d3; }
.structure-template-3 .structure-hero-media img { border-radius: 10px 46px 10px 46px; }
.structure-template-3 .structure-hero > .structure-signal { background: #f45d22; }
.structure-template-3 .structure-hero > .structure-signal span { color: #102643; }
.structure-template-3 .structure-terms { background: #f5f2e9; grid-template-columns: minmax(230px,.62fr) minmax(0,1.38fr); }
.structure-template-3 .structure-term-grid article { background: #fffdf8; padding: 20px 22px; }
.structure-template-3 .structure-compare { background: #dfe8ee; color: #102643; }
.structure-template-3 .structure-compare .scene-index,
.structure-template-3 .structure-compare .structure-copy h2 { color: #102643; }
.structure-template-3 .structure-compare .structure-copy > p { color: #667385; }
.structure-template-3 .structure-option-grid article { background: white; }
.structure-template-3 .structure-option-grid h3 { color: #102643; }
.structure-template-3 .structure-option-grid p { color: #667385; }
.structure-template-3 .structure-option-grid strong { color: #d84813; }
.structure-template-3 .structure-watch { background: #102643; }
.structure-template-3 .structure-watch .scene-index,
.structure-template-3 .structure-watch .structure-copy h2 { color: white; }
.structure-template-3 .structure-watch .structure-copy > p { color: #b8c5d3; }
.structure-template-3 .structure-watch-card { background: #f45d22; }
.structure-template-3 .structure-watch-card > span { color: #102643; }
.structure-template-3 .structure-watch-card blockquote { color: white; }
.structure-template-3 .structure-watch-list li { border-color: rgba(255,255,255,.22); color: white; }
.structure-template-3 .structure-watch-list li::before { color: #102643; }
.structure-template-3 .structure-exercise { background: #f5f2e9; }

/* Lessons with an additional mapped misconception image use an intentional
   second row instead of allowing both media objects to create a tall stack. */
.structure-template-2 #frame-location {
  grid-template-areas:
    "frame-copy frame-main"
    "frame-signal frame-detail";
  grid-template-columns: minmax(0,.94fr) minmax(370px,1.06fr);
}
.structure-template-2 #frame-location .structure-opening { grid-area: frame-copy; }
.structure-template-2 #frame-location > .structure-hero-media { grid-area: frame-main; }
.structure-template-2 #frame-location > .structure-signal { grid-area: frame-signal; grid-column: auto; max-width: none; }
.structure-template-2 #frame-location > .structure-inline-media { grid-area: frame-detail; grid-column: auto; justify-self: stretch; margin: 0; width: 100%; }
.structure-template-2 #frame-location > .structure-inline-media img { max-height: 260px; width: 100%; }

.structure-template-3 #wall-choice {
  grid-template-areas:
    "wall-copy wall-media"
    "wall-signal wall-media";
}
.structure-template-3 #wall-choice .structure-opening { grid-area: wall-copy; }
.structure-template-3 #wall-choice > .structure-hero-media { grid-area: wall-media; }
.structure-template-3 #wall-choice > .structure-signal { grid-area: wall-signal; grid-column: auto; max-width: none; }

.structure-template-1 #tank-days {
  grid-template-areas:
    "tank-copy tank-media"
    "tank-signal tank-media";
}
.structure-template-1 #tank-days .structure-opening { grid-area: tank-copy; }
.structure-template-1 #tank-days > .structure-hero-media { grid-area: tank-media; }
.structure-template-1 #tank-days > .structure-signal { grid-area: tank-signal; grid-column: auto; max-width: none; }

/* Template 4 — specification lab. A pale technical field, asymmetric bento
   cards, white comparison studio and orange completion scene. */
.structure-template-4 .structure-hero {
  background:
    linear-gradient(90deg, rgba(73,108,138,.06) 1px, transparent 1px) 0 0 / 28px 28px,
    linear-gradient(rgba(73,108,138,.06) 1px, transparent 1px) 0 0 / 28px 28px,
    #eaf0f4;
  gap: 34px 54px;
  grid-template-columns: minmax(330px,.92fr) minmax(0,1.08fr);
}
.structure-template-4 .structure-hero--reverse { grid-template-columns: minmax(330px,.92fr) minmax(0,1.08fr); }
.structure-template-4 .structure-hero--reverse .structure-opening { order: 0; }
.structure-template-4 .structure-opening h1 { font-size: clamp(39px,4.2vw,59px); }
.structure-template-4 .structure-hero-media { justify-self: end; width: min(100%, 620px); }
.structure-template-4 .structure-terms { background: #102643; color: white; }
.structure-template-4 .structure-terms .scene-index,
.structure-template-4 .structure-terms .structure-copy h2 { color: white; }
.structure-template-4 .structure-terms .structure-copy > p { color: #b8c5d3; }
.structure-template-4 .structure-term-grid { grid-template-columns: 1.2fr .8fr; }
.structure-template-4 .structure-term-grid article { background: rgba(255,255,255,.07); }
.structure-template-4 .structure-term-grid article:nth-child(2),
.structure-template-4 .structure-term-grid article:nth-child(3) { background: rgba(244,93,34,.18); }
.structure-template-4 .structure-term-grid h3 { color: white; }
.structure-template-4 .structure-term-grid p { color: #c2ccd7; }
.structure-template-4 .structure-compare { background: #fffdf8; color: #102643; }
.structure-template-4 .structure-compare .scene-index,
.structure-template-4 .structure-compare .structure-copy h2 { color: #102643; }
.structure-template-4 .structure-compare .structure-copy > p { color: #667385; }
.structure-template-4 .structure-option-grid article:nth-child(odd) { background: #eaf0f4; }
.structure-template-4 .structure-option-grid article:nth-child(even) { background: #ffede4; }
.structure-template-4 .structure-option-grid h3 { color: #102643; }
.structure-template-4 .structure-option-grid p { color: #667385; }
.structure-template-4 .structure-option-grid strong { color: #d84813; }
.structure-template-4 .structure-watch {
  background:
    linear-gradient(90deg, rgba(16,38,67,.04) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(rgba(16,38,67,.04) 1px, transparent 1px) 0 0 / 34px 34px,
    #f6f3ec;
}
.structure-template-4 .structure-watch-card { background: #102643; }
.structure-template-4 .structure-watch-card > span { color: #ff9b73; }
.structure-template-4 .structure-watch-card blockquote { color: white; }
.structure-template-4 .structure-watch-list li { border-color: rgba(255,255,255,.13); color: #c2ccd7; }
.structure-template-4 .structure-exercise { background: #f45d22; }
.structure-template-4 .structure-exercise .scene-index,
.structure-template-4 .structure-exercise .structure-closing h2 { color: white; }
.structure-template-4 .structure-exercise .structure-closing > p { color: rgba(255,255,255,.8); }

@media (max-width: 1100px) {
  .structure-template-2 .structure-term-grid,
  .structure-template-2 .structure-option-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 980px) {
  .structure-template-1 .structure-hero,
  .structure-template-2 .structure-hero,
  .structure-template-2 .structure-hero--reverse,
  .structure-template-2 .structure-watch,
  .structure-template-2 .structure-exercise,
  .structure-template-3 .structure-hero,
  .structure-template-3 .structure-terms,
  .structure-template-4 .structure-hero,
  .structure-template-4 .structure-hero--reverse { grid-template-columns: 1fr; }
  .structure-template-2 .structure-hero-media,
  .structure-template-4 .structure-hero-media { justify-self: start; }
  .structure-template-2 #frame-location,
  .structure-template-3 #wall-choice,
  .structure-template-1 #tank-days {
    grid-template-areas: none;
    grid-template-columns: 1fr;
  }
  .structure-template-2 #frame-location .structure-opening,
  .structure-template-2 #frame-location > .structure-hero-media,
  .structure-template-2 #frame-location > .structure-signal,
  .structure-template-2 #frame-location > .structure-inline-media,
  .structure-template-3 #wall-choice .structure-opening,
  .structure-template-3 #wall-choice > .structure-hero-media,
  .structure-template-3 #wall-choice > .structure-signal,
  .structure-template-1 #tank-days .structure-opening,
  .structure-template-1 #tank-days > .structure-hero-media,
  .structure-template-1 #tank-days > .structure-signal { grid-area: auto; }
}

@media (max-width: 680px) {
  .theme-structure .lesson-scene { padding-bottom: max(76px, env(safe-area-inset-bottom)); padding-top: 44px; }
  .structure-opening h1,
  .structure-template-1 .structure-opening h1,
  .structure-template-2 .structure-opening h1,
  .structure-template-3 .structure-opening h1,
  .structure-template-4 .structure-opening h1 { font-size: clamp(36px,12vw,48px); }
  .structure-copy h2,
  .structure-closing h2 { font-size: clamp(33px,10.5vw,44px); }
  .structure-hero-media img,
  .structure-inline-media img { max-height: none; width: 100%; }
  .structure-template-2 .structure-term-grid,
  .structure-template-2 .structure-option-grid,
  .structure-template-4 .structure-term-grid { grid-template-columns: 1fr; }
  .structure-template-2 .structure-hero::before { left: 20px; }
  .structure-template-2 .structure-hero-media img,
  .structure-template-3 .structure-hero-media img { border-radius: 16px; }
  .structure-watch-card,
  .structure-activity { padding: 23px; }
  .structure-choice-grid button { min-height: 50px; }
}


/* ===== WORDPRESS COURSE SHELL / INDEX ===== */
.achc-course-host {
  --paper: #f7f4ed;
  --paper-2: #eee9de;
  --ink: #132643;
  --text: #273547;
  --muted: #687386;
  --orange: #f45d22;
  --orange-deep: #d84813;
  --white: #fffdf8;
  --line: rgba(19, 38, 67, .14);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "DM Sans", "Segoe UI", Arial, sans-serif;
  background: var(--paper);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  isolation: isolate;
  left: 50%;
  line-height: 1.5;
  margin-left: -50vw;
  max-width: none !important;
  min-height: 100vh;
  min-height: 100svh;
  overflow-x: clip;
  position: relative;
  width: 100vw;
}

.achc-course-host *,
.achc-course-host *::before,
.achc-course-host *::after {
  box-sizing: border-box;
}

.achc-course-host img {
  background: transparent !important;
  border: 0 !important;
  border-radius: 16px;
  box-shadow: none !important;
  height: auto;
  max-width: 100%;
  outline: 0 !important;
  padding: 0 !important;
}

.achc-course-host button,
.achc-course-host input,
.achc-course-host select,
.achc-course-host textarea {
  font-family: var(--sans);
}

.achc-return-to-index {
  align-items: center;
  background: rgba(255, 253, 248, .94);
  border: 1px solid rgba(19, 38, 67, .12);
  border-radius: 999px;
  bottom: max(18px, env(safe-area-inset-bottom));
  box-shadow: 0 12px 38px rgba(19, 38, 67, .1);
  color: var(--ink);
  display: inline-flex;
  font-size: 11px;
  font-weight: 700;
  gap: 8px;
  left: 18px;
  padding: 10px 15px;
  position: fixed;
  text-decoration: none;
  z-index: 75;
}

.achc-return-to-index:hover {
  color: var(--orange-deep);
}

.achc-empty-lesson {
  margin: auto;
  max-width: 800px;
  padding: 160px 32px;
}

.achc-empty-lesson h1 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(40px, 5vw, 68px);
  margin: 0 0 20px;
}

/* WordPress admin-bar safety for the approved fixed course header. */
.admin-bar .achc-course-host .course-header {
  top: 32px;
}

/* Course index shell. Lesson pages themselves use the frozen approved CSS. */
.achc-index {
  background: #f7f4ed;
  padding-bottom: 100px;
}

.achc-index__header {
  align-items: center;
  border-bottom: 1px solid rgba(19, 38, 67, .1);
  display: flex;
  justify-content: space-between;
  margin: auto;
  max-width: 1220px;
  padding: 24px 0;
  width: calc(100% - 64px);
}

.achc-index__header p,
.achc-index__header span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .11em;
  margin: 0;
  text-transform: uppercase;
}

.achc-index__main {
  margin: auto;
  max-width: 1220px;
  padding: clamp(72px, 9vw, 132px) 0;
  width: calc(100% - 64px);
}

.achc-index__intro {
  max-width: 900px;
}

.achc-index__intro h1 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(48px, 5.4vw, 76px);
  letter-spacing: -.032em;
  line-height: 1;
  margin: 22px 0 28px;
}

.achc-index__intro > p:last-child {
  color: #536071;
  font-size: clamp(16px, 1.4vw, 20px);
  line-height: 1.75;
  max-width: 720px;
}

.achc-index__chapters {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(64px, 8vw, 110px);
}

.achc-index-card {
  background: var(--white);
  border: 1px solid rgba(19, 38, 67, .09);
  border-radius: 22px;
  margin: 0;
  overflow: hidden;
  transition: box-shadow .25s ease, transform .25s ease;
}

.achc-index-card__image {
  display: block;
  overflow: hidden;
  width: 100%;
}

.achc-index-card__image img {
  aspect-ratio: 16 / 9;
  display: block;
  height: auto;
  object-fit: cover;
  transition: transform .35s ease;
  width: 100%;
}

.achc-index-card:hover .achc-index-card__image img {
  transform: scale(1.02);
}

.achc-index-card:hover {
  box-shadow: 0 22px 58px rgba(19, 38, 67, .1);
  transform: translateY(-3px);
}

.achc-index-card__chapter {
  align-items: center;
  display: grid;
  gap: 22px;
  grid-template-columns: 48px minmax(0, 1fr);
  min-height: 250px;
  padding: 34px 34px 30px;
}

.achc-index-card__number {
  align-self: start;
  color: var(--orange);
  font-family: var(--serif);
  font-size: 31px;
  line-height: 1;
  padding-top: 4px;
}

.achc-index-card h2 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(30px, 2.7vw, 41px);
  letter-spacing: -.025em;
  line-height: 1.08;
  margin: 5px 0 26px;
}

.achc-index-card__copy > p {
  color: var(--orange-deep);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: .13em;
  margin: 0;
  text-transform: uppercase;
}

.achc-index-card__open {
  align-items: center;
  background: var(--ink);
  border-radius: 999px;
  color: #fff !important;
  display: inline-flex;
  font-size: 11px;
  font-weight: 700;
  gap: 18px;
  grid-column: 2;
  justify-self: start;
  letter-spacing: .02em;
  margin-top: 3px;
  padding: 11px 17px;
  text-decoration: none !important;
  transition: background .2s ease, transform .2s ease;
}

.achc-index-card__open:hover {
  background: var(--orange-deep);
  transform: translateX(2px);
}

.achc-index-card__progress {
  align-items: center;
  display: flex;
  gap: 10px;
  max-width: 310px;
}

.achc-index-card__progress span {
  background: rgba(19, 38, 67, .1);
  border-radius: 999px;
  height: 4px;
  overflow: hidden;
  width: 100%;
}

.achc-index-card__progress i {
  background: var(--orange);
  display: block;
  height: 100%;
}

.achc-index-card__progress b {
  color: var(--muted);
  font-size: 10px;
}

.achc-index-card__lessons {
  border-top: 1px solid rgba(19, 38, 67, .1);
}

.achc-index-card__lessons > summary {
  align-items: center;
  color: var(--ink);
  cursor: pointer;
  display: grid;
  font-size: 11px;
  font-weight: 700;
  gap: 10px;
  grid-template-columns: 1fr auto 18px;
  list-style: none;
  padding: 18px 34px;
  user-select: none;
}

.achc-index-card__lessons > summary::-webkit-details-marker {
  display: none;
}

.achc-index-card__lessons > summary b {
  background: rgba(19, 38, 67, .08);
  border-radius: 99px;
  font-size: 9px;
  min-width: 25px;
  padding: 4px 7px;
  text-align: center;
}

.achc-index-card__lessons > summary i {
  height: 18px;
  position: relative;
  width: 18px;
}

.achc-index-card__lessons > summary i::before,
.achc-index-card__lessons > summary i::after {
  background: var(--orange);
  content: "";
  height: 2px;
  left: 4px;
  position: absolute;
  top: 8px;
  transition: transform .2s ease;
  width: 10px;
}

.achc-index-card__lessons > summary i::after {
  transform: rotate(90deg);
}

.achc-index-card__lessons[open] > summary i::after {
  transform: rotate(0);
}

.achc-index-card__lessons ol {
  border-top: 1px solid rgba(19, 38, 67, .08);
  list-style: none;
  margin: 0;
  padding: 5px 18px 18px;
}

.achc-index-card__lessons li {
  border-bottom: 1px solid rgba(19, 38, 67, .07);
  margin: 0;
}

.achc-index-card__lessons li:last-child {
  border-bottom: 0;
}

.achc-index-card__lessons li a {
  align-items: center;
  color: var(--ink);
  display: grid;
  gap: 12px;
  grid-template-columns: 34px minmax(0, 1fr) auto 14px;
  min-height: 56px;
  padding: 9px 14px;
  text-decoration: none;
}

.achc-index-card__lessons li a:hover {
  background: rgba(244, 93, 34, .055);
  border-radius: 9px;
}

.achc-index-card__lessons li span,
.achc-index-card__lessons li em {
  color: var(--muted);
  font-size: 9px;
  font-style: normal;
  font-weight: 700;
}

.achc-index-card__lessons li strong {
  font-size: 12px;
  line-height: 1.3;
}

.achc-index-card__lessons li i {
  color: var(--orange);
  font-style: normal;
}

.achc-index__empty {
  background: var(--white);
  border-radius: 18px;
  margin-top: 70px;
  padding: clamp(36px, 6vw, 72px);
}

.achc-index__empty h2 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(32px, 4vw, 50px);
  margin: 0 0 16px;
}

@media (max-width: 782px) {
  .achc-course-host {
    left: auto;
    margin-left: 0;
    max-width: 100% !important;
    width: 100%;
  }

  .admin-bar .achc-course-host .course-header {
    top: 46px;
  }

  .achc-return-to-index {
    bottom: max(12px, env(safe-area-inset-bottom));
    left: 12px;
  }

  .achc-index__header,
  .achc-index__main {
    width: calc(100% - 34px);
  }

  .achc-index__header {
    align-items: flex-start;
    gap: 8px;
    padding: 18px 0;
  }

  .achc-index__header span {
    text-align: right;
  }

  .achc-index__intro h1 {
    font-size: clamp(42px, 12vw, 58px);
  }

  .achc-index__chapters {
    grid-template-columns: 1fr;
  }

  .achc-index-card__chapter {
    gap: 16px;
    grid-template-columns: 38px 1fr;
    min-height: 230px;
    padding: 26px 21px 24px;
  }

  .achc-index-card__open {
    grid-column: 2;
  }

  .achc-index-card__lessons > summary {
    padding: 17px 21px;
  }

  .achc-index-card__lessons ol {
    padding-inline: 8px;
  }

  .achc-index-card__lessons li a {
    gap: 8px;
    grid-template-columns: 30px minmax(0, 1fr) 12px;
  }

  .achc-index-card__lessons li em {
    display: none;
  }
}

.achc-course-host .achc-next-locked {
  cursor: not-allowed !important;
  opacity: .58;
}

.achc-completion-notice {
  align-items: flex-start;
  background: #102445;
  border-left: 4px solid #ff641e;
  border-radius: 12px;
  bottom: max(24px, env(safe-area-inset-bottom));
  box-shadow: 0 20px 55px rgba(16, 36, 69, .24);
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 4px;
  left: 50%;
  max-width: min(460px, calc(100vw - 32px));
  opacity: 0;
  padding: 16px 20px;
  pointer-events: none;
  position: fixed;
  transform: translate(-50%, 18px);
  transition: opacity .24s ease, transform .24s ease;
  width: max-content;
  z-index: 10020;
}

.achc-completion-notice.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.achc-completion-notice strong {
  color: #fff;
  font: 700 14px/1.35 "DM Sans", sans-serif;
}

.achc-completion-notice span {
  color: rgba(255,255,255,.76);
  font: 400 12px/1.45 "DM Sans", sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .achc-index-card,
  .achc-index-card:hover,
  .achc-index-card__open,
  .achc-index-card__open:hover {
    transform: none;
    transition: none;
  }

  .achc-completion-notice {
    transition: none;
  }
}