:root {
  --ink: #1d1c19;
  --muted: #68645c;
  --paper: #f4f1e9;
  --surface: #fbfaf6;
  --surface-2: #e8e3d8;
  --line: #c9c2b5;
  --line-dark: #938c80;
  --red: #c94b32;
  --red-dark: #963823;
  --white: #fffefb;
  --serif: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "Noto Serif JP", serif;
  --sans: "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  --mono: "SFMono-Regular", "Roboto Mono", Menlo, Consolas, monospace;
  --max-width: 1180px;
  color-scheme: light;
}

[hidden] { display: none !important; }

/* Curriculum atlas — an editorial reference sheet, not a dashboard. */
.curriculum-hero {
  padding: clamp(8.5rem, 15vw, 13rem) 0 4.5rem;
  background: var(--paper, #f3f0e8);
  border-bottom: 1px solid rgba(29, 35, 32, .2);
}

.curriculum-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(18rem, .65fr);
  gap: clamp(3rem, 9vw, 9rem);
  align-items: end;
}

.curriculum-hero h1 {
  max-width: 14ch;
  margin: 1.1rem 0 0;
  font-size: clamp(3.25rem, 7vw, 7.7rem);
  line-height: .94;
  letter-spacing: -.065em;
  font-weight: 590;
}

.curriculum-hero h1 em {
  color: #d65f3b;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 400;
  font-style: normal;
}

.curriculum-intro {
  padding-top: 1.2rem;
  border-top: 3px solid #1d2320;
  font-size: 1rem;
  line-height: 1.9;
}

.curriculum-intro p + p { margin-top: 1.2rem; }

.curriculum-ledger {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(4rem, 8vw, 8rem);
  border-top: 1px solid #1d2320;
  border-bottom: 1px solid #1d2320;
}

.curriculum-ledger div {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  padding: 1.15rem 1.25rem;
  border-right: 1px solid rgba(29, 35, 32, .25);
}

.curriculum-ledger div:last-child { border-right: 0; }
.curriculum-ledger strong { font-family: Georgia, serif; font-size: 2rem; font-weight: 400; }
.curriculum-ledger span { font-size: .75rem; letter-spacing: .06em; }

.curriculum-principle {
  padding: 3.5rem 0;
  color: #f3f0e8;
  background: #1d2320;
}

.principle-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem 1.25rem;
  margin: 1.5rem 0;
  font-size: clamp(1.4rem, 3.5vw, 3.4rem);
  letter-spacing: -.035em;
}

.principle-line span { border-bottom: 1px solid #e1724e; }
.principle-line i { color: #aeb5ae; font-family: "Yu Mincho", serif; font-size: .48em; font-style: normal; }
.principle-note { max-width: 52rem; color: #cbd0cb; line-height: 1.8; }

.curriculum-section { padding: clamp(5rem, 10vw, 9rem) 0; }
.curriculum-section-head { display: grid; grid-template-columns: 1.15fr .7fr; gap: clamp(2rem, 8vw, 8rem); align-items: end; margin-bottom: 4rem; }
.curriculum-section-head h2 { margin: .8rem 0 0; font-size: clamp(2.65rem, 5.4vw, 5.6rem); line-height: .98; letter-spacing: -.055em; font-weight: 560; }
.curriculum-section-head > p { max-width: 38rem; line-height: 1.9; }

.course-switch {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 3.5rem;
  border-top: 1px solid #1d2320;
  border-bottom: 1px solid #1d2320;
}

.course-switch button {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  color: inherit;
  background: transparent;
  border: 0;
  border-right: 1px solid rgba(29, 35, 32, .25);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.course-switch button:last-child { border-right: 0; }
.course-switch button span { color: #867f75; font-family: Georgia, serif; }
.course-switch button[aria-selected="true"] { color: #f3f0e8; background: #1d2320; }

.course-sheet > header {
  display: grid;
  grid-template-columns: 1fr 1.7fr;
  gap: 1.5rem 4rem;
  padding-bottom: 3rem;
}

.course-sheet > header p { grid-column: 1; color: #d65f3b; font-size: .75rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.course-sheet > header h3 { grid-column: 1; font-size: clamp(2rem, 4vw, 4.2rem); line-height: 1; letter-spacing: -.04em; }
.course-sheet > header blockquote { grid-column: 2; grid-row: 1 / span 2; margin: 0; padding-left: 2rem; border-left: 1px solid #1d2320; font-family: "Yu Mincho", serif; font-size: clamp(1.15rem, 2vw, 1.75rem); line-height: 1.7; }

.unit-sheet {
  display: grid;
  grid-template-columns: minmax(8rem, .32fr) minmax(0, 1.68fr);
  border-top: 1px solid #1d2320;
}

.unit-number { padding: 2.2rem 1.5rem 2rem 0; }
.unit-number span { display: block; font-family: Georgia, serif; font-size: clamp(1.55rem, 3vw, 3rem); }
.unit-number small { color: #777268; text-transform: uppercase; letter-spacing: .08em; }
.unit-main { padding: 2.2rem 0 5rem 3rem; border-left: 1px solid rgba(29, 35, 32, .25); }
.unit-main h4 { max-width: 22ch; margin: 0 0 1.4rem; font-size: clamp(1.8rem, 3.4vw, 3.5rem); line-height: 1.08; letter-spacing: -.045em; }
.unit-performance { max-width: 54rem; font-size: 1.08rem; line-height: 1.85; }

.unit-evidence { display: grid; grid-template-columns: 11rem 1fr; gap: 1rem; margin: 2rem 0; padding: 1.1rem 0; border-top: 1px solid #d65f3b; border-bottom: 1px solid #d65f3b; }
.unit-evidence span { color: #a24a31; font-size: .72rem; font-weight: 700; letter-spacing: .08em; }
.unit-evidence strong { font-weight: 560; }

.official-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: 0 0 2rem; background: #e8e4da; }
.official-pair div { padding: 1.2rem; }
.official-pair div + div { border-left: 1px solid rgba(29, 35, 32, .22); }
.official-pair dt { margin-bottom: .5rem; font-size: .7rem; font-weight: 700; letter-spacing: .08em; }
.official-pair dd { margin: 0; font-size: .9rem; line-height: 1.7; }

.alignment-strip { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; margin: 0 0 2.3rem; }
.alignment-strip > span { margin-right: .5rem; font-size: .72rem; font-weight: 700; letter-spacing: .08em; }
.alignment-strip a { padding: .32rem .6rem; color: inherit; border-bottom: 1px solid #867f75; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .72rem; text-decoration: none; }

.concept-list { border-top: 1px solid rgba(29, 35, 32, .38); }
.concept-row { border-bottom: 1px solid rgba(29, 35, 32, .25); }
.concept-row summary { display: grid; grid-template-columns: 7rem 1fr auto; gap: 1rem; align-items: baseline; padding: 1rem 0; cursor: pointer; list-style: none; }
.concept-row summary::-webkit-details-marker { display: none; }
.concept-row summary span { color: #867f75; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .73rem; }
.concept-row summary strong { font-size: 1.05rem; font-weight: 600; }
.concept-row summary i { color: #a24a31; font-size: .7rem; font-style: normal; }
.concept-row[open] summary i { font-size: 0; }
.concept-row[open] summary i::after { content: "閉じる"; font-size: .7rem; }
.concept-body { padding: .8rem 0 2rem 8rem; }
.concept-understanding { max-width: 56rem; font-family: "Yu Mincho", serif; font-size: 1.08rem; line-height: 1.8; }
.concept-body dl { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 1.2rem; background: rgba(29, 35, 32, .18); }
.concept-body dl div { padding: 1rem; background: #f3f0e8; }
.concept-body dt { margin-bottom: .35rem; color: #777268; font-size: .7rem; font-weight: 700; letter-spacing: .08em; }
.concept-body dd { margin: 0; font-size: .88rem; line-height: 1.65; }
.concept-body a { color: #a24a31; }

.elementary-backcast { background: #dfe7df; }
.thread-index { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid #1d2320; }
.thread-index a { display: grid; grid-template-columns: 2rem 1fr; gap: .55rem; min-height: 7.5rem; padding: 1rem; color: inherit; border-right: 1px solid rgba(29, 35, 32, .22); border-bottom: 1px solid #1d2320; text-decoration: none; }
.thread-index a:nth-child(4n) { border-right: 0; }
.thread-index span { color: #657467; font-family: Georgia, serif; }
.thread-index small { grid-column: 2; align-self: end; color: #657467; line-height: 1.45; }

.thread-list { margin-top: 6rem; }
.thread-sheet { display: grid; grid-template-columns: .55fr 1.45fr; padding: 3.5rem 0; border-top: 1px solid #1d2320; }
.thread-sheet > header { display: flex; gap: 1.2rem; align-items: flex-start; }
.thread-sheet > header > span { color: #657467; font-family: Georgia, serif; font-size: 2.5rem; }
.thread-sheet h3 { max-width: 12ch; margin: 0; font-size: clamp(1.75rem, 3vw, 3rem); line-height: 1.05; letter-spacing: -.04em; }
.thread-sheet header p { margin-top: .7rem; color: #657467; }
.thread-stages { display: grid; grid-template-columns: repeat(3, 1fr); border-left: 1px solid rgba(29, 35, 32, .3); }
.thread-stages section { padding: 0 1.5rem 1rem; border-right: 1px solid rgba(29, 35, 32, .25); }
.thread-stages section:last-child { border-right: 0; }
.stage-band { color: #5d6d60; font-size: .7rem; font-weight: 700; letter-spacing: .08em; }
.thread-stages h4 { min-height: 4.5rem; margin: .7rem 0; font-size: 1.15rem; line-height: 1.45; }
.thread-stages > section > p:not(.stage-band) { min-height: 7rem; font-size: .88rem; line-height: 1.7; }
.thread-stages dl { margin: 1.2rem 0 0; }
.thread-stages dl div { padding: .8rem 0; border-top: 1px solid rgba(29, 35, 32, .22); }
.thread-stages dt { margin-bottom: .4rem; font-size: .65rem; font-weight: 700; letter-spacing: .08em; }
.thread-stages dd { margin: 0; font-size: .8rem; line-height: 1.6; }
.thread-stages dd span { display: inline-block; margin: 0 .3rem .3rem 0; padding-bottom: .12rem; border-bottom: 1px solid #657467; }
.thread-stages a { color: #405e48; }

.next-framework { color: #eee9de; background: #252521; }
.next-framework .curriculum-section-head > p { color: #bebcb4; }
.draft-warning { display: flex; align-items: center; gap: 1rem; margin-bottom: 3rem; padding: .9rem 1rem; border: 1px solid #e1724e; }
.draft-warning strong { color: #e1724e; font-size: .75rem; letter-spacing: .1em; }
.proposal-columns { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid #77766e; }
.proposal-columns > section { padding: 1.5rem; border-right: 1px solid #77766e; }
.proposal-columns > section:last-child { border-right: 0; }
.proposal-columns > section > h3 { min-height: 4rem; margin: 0 0 2rem; font-size: 1.2rem; }
.proposal-columns article { padding: 1.5rem 0; border-top: 1px solid #575750; }
.proposal-columns article > p { color: #e1724e; font-size: .67rem; font-weight: 700; letter-spacing: .08em; }
.proposal-columns h4 { margin: .4rem 0 1rem; font-size: 1rem; line-height: 1.45; }
.proposal-columns ul { margin: 0 0 1rem; padding-left: 1rem; color: #bebcb4; font-size: .83rem; line-height: 1.7; }
.proposal-columns article > div { display: flex; flex-wrap: wrap; gap: .35rem; }
.proposal-columns a { padding-bottom: .15rem; color: #eee9de; border-bottom: 1px solid #77766e; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .66rem; text-decoration: none; }

.source-register { background: #e8e4da; }
.source-ledger-row { display: grid; grid-template-columns: 5rem 1fr auto; align-items: center; gap: 1.5rem; padding: 1.4rem 0; border-top: 1px solid #1d2320; }
.source-ledger-row > span { color: #867f75; font-family: Georgia, serif; font-size: 1.4rem; }
.source-ledger-row strong { font-size: 1rem; }
.source-ledger-row p { margin: .35rem 0 0; color: #777268; font-size: .82rem; }
.source-ledger-row a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .3rem; }

@media (max-width: 900px) {
  .curriculum-hero-grid, .curriculum-section-head, .course-sheet > header, .thread-sheet { grid-template-columns: 1fr; }
  .curriculum-ledger { grid-template-columns: 1fr 1fr; }
  .curriculum-ledger div:nth-child(2) { border-right: 0; }
  .curriculum-ledger div:nth-child(-n+2) { border-bottom: 1px solid rgba(29, 35, 32, .25); }
  .course-sheet > header blockquote { grid-column: 1; grid-row: auto; }
  .thread-index { grid-template-columns: 1fr 1fr; }
  .thread-index a:nth-child(2n) { border-right: 0; }
  .thread-stages { border-left: 0; }
  .proposal-columns { grid-template-columns: 1fr; }
  .proposal-columns > section { border-right: 0; border-bottom: 1px solid #77766e; }
}

@media (max-width: 660px) {
  .curriculum-hero h1 { max-width: none; font-size: 2.55rem; line-height: 1.02; }
  .curriculum-ledger, .course-switch, .thread-index, .thread-stages, .official-pair, .concept-body dl { grid-template-columns: 1fr; }
  .curriculum-ledger div, .course-switch button, .thread-index a, .thread-stages section { border-right: 0; }
  .curriculum-ledger div, .course-switch button { border-bottom: 1px solid rgba(29, 35, 32, .25); }
  .unit-sheet { grid-template-columns: 1fr; }
  .unit-number { padding-bottom: .8rem; }
  .unit-main { padding: 0 0 4rem; border-left: 0; }
  .unit-evidence { grid-template-columns: 1fr; }
  .official-pair div + div { border-top: 1px solid rgba(29, 35, 32, .22); border-left: 0; }
  .concept-row summary { grid-template-columns: 5.5rem 1fr auto; }
  .concept-body { padding-left: 0; }
  .thread-stages > section > p:not(.stage-band), .thread-stages h4 { min-height: 0; }
  .thread-stages section { padding: 1.5rem 0; border-bottom: 1px solid rgba(29, 35, 32, .25); }
  .source-ledger-row { grid-template-columns: 2.5rem 1fr; }
  .source-ledger-row a { grid-column: 2; }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  font-feature-settings: "palt" 1;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

body.dialog-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.23em;
}

button,
input,
select {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 4px;
}

::selection {
  color: var(--white);
  background: var(--red);
}

.skip-link {
  position: fixed;
  z-index: 9999;
  top: 12px;
  left: 12px;
  padding: 9px 14px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 64px), var(--max-width));
  margin-inline: auto;
}

/* Masthead */
.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid transparent;
  background: rgba(244, 241, 233, 0.96);
  transition: border-color 160ms ease, background 160ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  background: rgba(244, 241, 233, 0.985);
}

.nav-shell {
  display: flex;
  min-height: 88px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 39px;
  height: 39px;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
  font-family: var(--serif);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-type {
  display: grid;
  padding-left: 14px;
  border-left: 1px solid var(--line-dark);
  line-height: 1;
}

.brand-type strong {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.11em;
}

.brand-type small {
  margin-top: 7px;
  color: var(--muted);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
}

.brand-credit {
  margin-top: 6px;
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: 0.52rem;
  letter-spacing: 0.045em;
  line-height: 1.15;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 27px;
}

.site-nav a {
  position: relative;
  padding: 9px 0 7px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
  content: "";
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav .nav-cta {
  padding: 9px 14px;
  border: 1px solid var(--ink);
}

.site-nav .nav-cta::after {
  display: none;
}

.site-nav .nav-cta:hover,
.site-nav .nav-cta[aria-current="page"] {
  color: var(--white);
  background: var(--ink);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  border-left: 1px solid var(--line-dark);
  background: transparent;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  display: block;
  width: 20px;
  height: 1px;
  margin: 5px auto;
  background: var(--ink);
  content: "";
}

/* Hero */
.hero {
  padding: 82px 0 72px;
  border-bottom: 1px solid var(--line-dark);
}

.hero-grid {
  display: grid;
  align-items: start;
  grid-template-columns: minmax(0, 1.18fr) minmax(350px, 0.82fr);
  gap: clamp(64px, 9vw, 126px);
}

.hero-copy {
  padding-top: 25px;
}

.eyebrow {
  margin: 0 0 30px;
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: 0.69rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  line-height: 1.65;
  text-transform: uppercase;
}

.hero h1,
.page-hero h1 {
  max-width: 860px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.65rem, 7.4vw, 7.25rem);
  font-weight: 500;
  letter-spacing: -0.085em;
  line-height: 1.08;
}

.hero h1 .accent-word {
  position: relative;
  color: var(--red);
}

.hero h1 .accent-word::after {
  position: absolute;
  right: -0.22em;
  bottom: 0.03em;
  width: 0.16em;
  height: 0.16em;
  border-radius: 50%;
  background: var(--red);
  content: "";
}

.page-credit {
  margin: 19px 0 0;
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  line-height: 1.5;
}

.page-hero .page-credit {
  grid-column: 2;
}

.hero-lead {
  max-width: 680px;
  margin: 32px 0 0;
  color: #4f4b44;
  font-size: 1rem;
  line-height: 2;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 40px;
}

.button {
  display: inline-flex;
  min-height: 51px;
  align-items: center;
  justify-content: center;
  gap: 32px;
  padding: 12px 20px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: color 150ms ease, background 150ms ease;
}

.button:hover {
  color: var(--white);
  background: var(--red);
  border-color: var(--red);
}

.button-primary {
  color: var(--white);
  background: var(--ink);
}

.button-secondary {
  border-left: 0;
}

.button-coral {
  color: var(--ink);
  border-color: var(--paper);
  background: var(--paper);
}

.button-sm {
  min-height: 39px;
  gap: 18px;
  padding: 8px 13px;
  font-size: 0.76rem;
}

.button-icon {
  font-family: var(--serif);
  font-size: 1.2rem;
}

.hero-visual {
  position: relative;
  margin: 0;
}

.atlas-board {
  position: relative;
  min-height: 488px;
  padding: 27px 29px 25px;
  border-top: 6px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: var(--surface);
}

.atlas-caption {
  display: flex;
  margin: 0;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-dark);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
}

.atlas-core {
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding: 27px 0 25px;
}

.atlas-core span {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.4;
}

.atlas-core strong {
  color: var(--red);
  font-family: var(--serif);
  font-size: 5.7rem;
  font-weight: 400;
  letter-spacing: -0.08em;
  line-height: 0.82;
}

.learning-index {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ink);
  list-style: none;
}

.orbit-card {
  display: grid;
  min-height: 58px;
  align-items: center;
  grid-template-columns: 36px 1fr auto;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.orbit-card > span,
.orbit-card small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.59rem;
  letter-spacing: 0.08em;
}

.orbit-card strong {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
}

.hero-note {
  width: calc(100% - 28px);
  margin: -1px 0 0 28px;
  padding: 15px 17px;
  color: var(--paper);
  background: var(--ink);
  font-family: var(--serif);
  font-size: 0.82rem;
  line-height: 1.8;
}

.hero-note span {
  display: inline-block;
  margin-right: 10px;
  color: #c5beb2;
  font-family: var(--mono);
  font-size: 0.57rem;
  letter-spacing: 0.11em;
}

/* Counters and sections */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line-dark);
}

.stat {
  display: flex;
  min-height: 118px;
  align-items: baseline;
  gap: 11px;
  padding: 28px 24px;
  border-right: 1px solid var(--line);
}

.stat:first-child {
  padding-left: 0;
}

.stat:last-child {
  border-right: 0;
}

.stat strong {
  font-family: var(--serif);
  font-size: 3.35rem;
  font-weight: 400;
  letter-spacing: -0.07em;
  line-height: 1;
}

.stat span {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.section {
  padding: 126px 0;
}

.section-tight {
  padding: 88px 0;
}

.section-surface {
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  background: var(--surface);
}

.section-ink {
  color: var(--paper);
  background: var(--ink);
}

.section-head {
  display: grid;
  align-items: end;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 80px;
  margin-bottom: 58px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line-dark);
}

.section-head h2,
.source-panel h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.45rem, 4.4vw, 4.6rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 1.25;
}

.section-head .eyebrow {
  margin-bottom: 22px;
}

.section-head > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 2;
}

.section-ink .section-head {
  border-color: #5e5a53;
}

.section-ink .section-head > p,
.section-ink .eyebrow {
  color: #c8c1b5;
}

.text-link,
.arrow-link {
  display: inline-block;
  font-size: 0.79rem;
  font-weight: 600;
  text-decoration: none;
}

.text-link {
  padding-bottom: 5px;
  border-bottom: 1px solid currentColor;
}

.arrow-link::after {
  display: inline-block;
  margin-left: 18px;
  content: "↗";
  transition: transform 160ms ease;
}

.arrow-link:hover::after {
  transform: translate(3px, -3px);
}

/* School index */
.school-grid,
.card-grid,
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.school-card {
  position: relative;
  min-height: 392px;
  padding: 26px 34px 30px;
  border-top: 4px solid var(--ink);
  border-right: 1px solid var(--line);
  background: transparent;
}

.school-card:first-child {
  padding-left: 0;
}

.school-card:last-child {
  padding-right: 0;
  border-right: 0;
}

.school-number {
  display: block;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.09em;
}

.school-card h3 {
  margin: 54px 0 0;
  font-family: var(--serif);
  font-size: 3.4rem;
  font-weight: 500;
  letter-spacing: -0.065em;
}

.school-card .years {
  display: block;
  margin-top: 4px;
  color: var(--red-dark);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.school-card p {
  margin: 45px 0 28px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 2;
}

.school-card .arrow-link {
  position: absolute;
  bottom: 31px;
}

/* Lesson cards */
.card-grid,
.featured-grid {
  gap: 0;
  border-top: 1px solid var(--ink);
}

.deck-card,
.material-card,
.knowledge-card {
  background: transparent;
}

.deck-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.deck-card:nth-child(3n + 1) {
  border-left: 1px solid var(--line);
}

.deck-cover {
  position: relative;
  display: flex;
  min-height: 244px;
  flex-direction: column;
  justify-content: space-between;
  padding: 22px;
  overflow: hidden;
  color: var(--paper);
  background: #252923;
}

.deck-card[data-accent="green"] .deck-cover {
  background: #39443b;
}

.deck-card[data-accent="blue"] .deck-cover {
  background: #35424a;
}

.deck-card[data-accent="gold"] .deck-cover {
  background: #66543a;
}

.deck-cover::before {
  position: absolute;
  top: -64px;
  right: -54px;
  width: 150px;
  height: 150px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 50%;
  content: "";
}

.deck-cover::after {
  position: absolute;
  top: 82px;
  right: 30px;
  width: 54px;
  height: 54px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  content: "";
}

.deck-index {
  position: relative;
  z-index: 1;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
}

.deck-cover-title {
  position: relative;
  z-index: 1;
  max-width: 90%;
  font-family: var(--serif);
  font-size: 1.78rem;
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1.45;
}

.deck-body {
  display: flex;
  min-height: 342px;
  flex: 1;
  flex-direction: column;
  padding: 25px 22px 22px;
}

.meta-row,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 13px;
}

.meta-pill,
.tag {
  display: inline-block;
  padding: 2px 0;
  color: var(--muted);
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  font-size: 0.65rem;
  line-height: 1.5;
}

.deck-body h3,
.material-card h3 {
  margin: 23px 0 10px;
  font-family: var(--serif);
  font-size: 1.42rem;
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.5;
}

.deck-body p,
.material-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.79rem;
  line-height: 1.85;
}

.deck-body .tag-row {
  margin-top: 18px;
}

.card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 24px;
}

.card-source {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.04em;
}

/* Inquiry process */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid #68635b;
}

.process-step {
  position: relative;
  min-height: 292px;
  padding: 25px 28px;
  border-right: 1px solid #5a5650;
}

.process-step:first-child {
  padding-left: 0;
}

.process-step:last-child {
  border-right: 0;
}

.process-step .number {
  color: #aaa296;
  font-family: var(--serif);
  font-size: 2.7rem;
  line-height: 1;
}

.process-step h3 {
  margin: 52px 0 16px;
  font-family: var(--serif);
  font-size: 1.38rem;
  font-weight: 600;
}

.process-step p {
  margin: 0;
  color: #c8c1b5;
  font-size: 0.78rem;
  line-height: 1.9;
}

.process-step p strong {
  color: var(--paper);
  font-weight: 500;
}

.process-step::after {
  position: absolute;
  top: 40px;
  right: -7px;
  z-index: 2;
  width: 13px;
  height: 13px;
  color: var(--ink);
  border-radius: 50%;
  background: var(--paper);
  content: "";
}

.process-step:last-child::after {
  display: none;
}

/* Knowledge categories */
.category-cloud {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
}

.category-chip-card {
  display: grid;
  min-height: 102px;
  align-items: center;
  grid-template-columns: 54px 1fr;
  gap: 15px;
  padding: 18px 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: color 160ms ease, background 160ms ease;
}

.category-chip-card:nth-child(3n + 1) {
  border-left: 1px solid var(--line);
}

.category-chip-card:hover {
  color: var(--white);
  background: var(--ink);
}

.category-letter {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid currentColor;
  font-family: var(--serif);
  font-size: 1.05rem;
}

.category-chip-card strong,
.category-chip-card small {
  display: block;
}

.category-chip-card strong {
  font-family: var(--serif);
  font-size: 0.98rem;
  font-weight: 600;
}

.category-chip-card small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.61rem;
}

.category-chip-card:hover small {
  color: #c8c1b5;
}

.source-panel {
  display: grid;
  grid-template-columns: 0.84fr 1.16fr;
  gap: 88px;
  padding: 46px 0 46px 39px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  border-left: 9px solid var(--red);
}

.source-panel .eyebrow {
  margin-bottom: 18px;
}

.source-list {
  border-top: 1px solid var(--line-dark);
}

.source-item {
  padding: 21px 0;
  border-bottom: 1px solid var(--line);
}

.source-item strong,
.source-item span {
  display: block;
}

.source-item strong {
  font-family: var(--serif);
  font-size: 0.94rem;
  font-weight: 600;
  line-height: 1.7;
}

.source-item span {
  margin-top: 7px;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.8;
}

.source-list .arrow-link {
  margin-top: 25px;
}

/* Interior pages */
.page-hero {
  padding: 86px 0 76px;
  border-bottom: 1px solid var(--line-dark);
}

.page-hero .container {
  display: grid;
  grid-template-columns: 155px minmax(0, 1fr);
}

.page-kicker {
  padding-top: 14px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.1em;
  writing-mode: vertical-rl;
}

.page-kicker span {
  display: inline-block;
  margin-bottom: 11px;
  color: var(--red);
  font-family: var(--serif);
  font-size: 2.15rem;
  letter-spacing: 0;
}

.page-hero h1 {
  grid-column: 2;
  font-size: clamp(3.7rem, 7.3vw, 7.6rem);
}

.page-hero .hero-lead,
.page-hero .process-rail,
.page-hero .stats-strip {
  grid-column: 2;
}

.page-hero .hero-lead {
  max-width: 710px;
}

.page-hero .stats-strip {
  width: 100%;
  margin-top: 48px;
  border-top: 1px solid var(--line-dark);
}

.toolbar {
  position: sticky;
  z-index: 80;
  top: 88px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-dark);
  background: rgba(244, 241, 233, 0.985);
}

.toolbar-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.search-field {
  position: relative;
  display: block;
  flex: 1;
  max-width: 470px;
}

.search-field::before {
  position: absolute;
  top: 50%;
  left: 0;
  color: var(--red);
  font-family: var(--serif);
  font-size: 1.2rem;
  transform: translateY(-50%);
  content: "⌕";
}

.search-field input,
.select-field select {
  min-height: 43px;
  color: var(--ink);
  border: 0;
  border-bottom: 1px solid var(--line-dark);
  border-radius: 0;
  background: transparent;
  font-size: 0.8rem;
}

.search-field input {
  width: 100%;
  padding: 8px 8px 8px 30px;
}

.select-field select {
  min-width: 164px;
  padding: 8px 25px 8px 2px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px 19px;
}

.filter-chip {
  padding: 8px 1px 7px;
  color: var(--muted);
  border: 0;
  border-bottom: 1px solid transparent;
  border-radius: 0;
  background: transparent;
  font-size: 0.78rem;
  cursor: pointer;
}

.filter-chip:hover,
.filter-chip[aria-pressed="true"] {
  color: var(--ink);
  border-color: var(--red);
}

.catalog-section {
  min-height: 55vh;
  padding: 56px 0 116px;
}

.catalog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 20px;
}

.catalog-count {
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
}

.empty-state {
  grid-column: 1 / -1;
  padding: 72px 20px;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  color: var(--muted);
  text-align: center;
}

/* Inquiry materials */
.process-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 52px;
  border-top: 1px solid var(--line-dark);
}

.rail-step {
  position: relative;
  padding: 21px 20px 4px 37px;
  border-right: 1px solid var(--line);
  font-family: var(--serif);
  font-size: 0.84rem;
}

.rail-step:first-child {
  padding-left: 37px;
}

.rail-step:last-child {
  border-right: 0;
}

.rail-step::before {
  position: absolute;
  top: 20px;
  left: 12px;
  color: var(--red);
  font-family: var(--mono);
  font-size: 0.59rem;
  content: attr(data-number);
}

.rail-step:first-child::before {
  right: auto;
  left: 12px;
}

.material-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}

.material-card {
  display: grid;
  min-height: 366px;
  grid-template-columns: 61px 1fr;
  align-content: start;
  padding: 29px 31px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.material-card:nth-child(2n + 1) {
  border-left: 1px solid var(--line);
}

.material-icon {
  grid-row: 1 / span 5;
  display: grid;
  width: 43px;
  height: 43px;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
  font-family: var(--serif);
  font-size: 0.9rem;
}

.material-card .meta-row,
.material-card h3,
.material-card > p,
.material-card > .tag-row,
.material-card .card-actions {
  grid-column: 2;
}

.material-card h3 {
  margin-top: 20px;
}

.material-card > .tag-row {
  margin-top: 21px;
}

.material-card .card-actions {
  align-self: end;
}

.material-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

/* Knowledge browser */
.capability-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
}

.capability-card {
  min-height: 245px;
  padding: 26px 30px;
  border-top: 0 !important;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line-dark);
}

.capability-card:first-child {
  border-left: 1px solid var(--line);
}

.capability-card .cap-number {
  color: var(--red);
  font-family: var(--serif);
  font-size: 2rem;
}

.capability-card h3 {
  margin: 37px 0 14px;
  font-family: var(--serif);
  font-size: 1.28rem;
  font-weight: 600;
}

.capability-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.9;
}

.knowledge-shell {
  display: grid;
  align-items: start;
  grid-template-columns: 258px minmax(0, 1fr);
  gap: 51px;
}

.category-nav {
  position: sticky;
  top: 172px;
  max-height: calc(100vh - 200px);
  overflow: auto;
  border-top: 1px solid var(--ink);
}

.category-nav button {
  display: grid;
  width: 100%;
  min-height: 55px;
  align-items: center;
  grid-template-columns: 33px 1fr auto;
  gap: 8px;
  padding: 9px 3px;
  color: var(--muted);
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.category-nav button:hover,
.category-nav button[aria-pressed="true"] {
  color: var(--ink);
  background: var(--surface);
}

.category-nav button[aria-pressed="true"] {
  box-shadow: inset 3px 0 var(--red);
  padding-left: 10px;
}

.category-nav .nav-letter {
  font-family: var(--serif);
  font-size: 0.86rem;
  text-align: center;
}

.category-nav .nav-title {
  font-size: 0.72rem;
  font-weight: 600;
}

.category-nav .nav-count {
  font-family: var(--mono);
  font-size: 0.58rem;
}

.knowledge-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}

.knowledge-card {
  display: grid;
  min-height: 258px;
  grid-template-rows: auto 1fr auto;
  gap: 20px;
  padding: 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  transition: color 150ms ease, background 150ms ease;
}

.knowledge-card:nth-child(2n + 1) {
  border-left: 1px solid var(--line);
}

.knowledge-card:hover,
.knowledge-card:focus-visible {
  color: var(--white);
  background: var(--ink);
}

.knowledge-id {
  width: fit-content;
  padding-bottom: 3px;
  color: var(--red-dark);
  border-bottom: 1px solid currentColor;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 600;
}

.knowledge-card:hover .knowledge-id {
  color: #e6816e;
}

.knowledge-main h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.55;
}

.knowledge-main p {
  margin: 0;
  color: var(--muted);
  font-size: 0.73rem;
  line-height: 1.85;
}

.knowledge-main .knowledge-plain-label {
  margin-bottom: 7px;
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: .58rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.knowledge-main .knowledge-formal-name {
  display: flex;
  gap: 8px;
  margin: 0 0 12px;
  padding: 7px 0;
  color: var(--ink);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-family: var(--serif);
  font-size: .78rem;
  font-weight: 700;
}

.knowledge-formal-name span {
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: .55rem;
  letter-spacing: .05em;
}

.knowledge-card:hover .knowledge-main p,
.knowledge-card:hover .tag,
.knowledge-card:focus-visible .knowledge-main p,
.knowledge-card:focus-visible .tag {
  color: #c8c1b5;
}

.level-dots {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}

.level-dots span {
  padding: 7px 5px 0;
  color: var(--muted);
  border-right: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.57rem;
  text-align: center;
}

.level-dots span:last-child {
  border-right: 0;
}

/* Dialogs */
.dialog {
  max-width: none;
  max-height: none;
  margin: auto;
  padding: 0;
  border: 1px solid var(--ink);
  border-radius: 0;
  color: var(--ink);
  background: var(--surface);
  box-shadow: 18px 18px 0 rgba(29, 28, 25, 0.2);
}

.dialog::backdrop {
  background: rgba(29, 28, 25, 0.68);
}

.dialog-close {
  display: grid;
  width: 39px;
  height: 39px;
  place-items: center;
  padding: 0;
  border: 1px solid currentColor;
  border-radius: 0;
  background: transparent;
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

.slide-dialog {
  width: min(96vw, 1320px);
  height: min(94vh, 900px);
}

.player-shell {
  display: grid;
  height: 100%;
  grid-template-rows: auto 1fr auto;
  background: #11110f;
}

.player-head {
  display: flex;
  min-height: 61px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 16px 10px 22px;
  color: var(--paper);
  border-bottom: 1px solid #47443f;
}

.player-title {
  margin: 0;
  overflow: hidden;
  font-family: var(--serif);
  font-size: 0.9rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.player-head-actions,
.sheet-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.player-head .button,
.player-head .dialog-close {
  color: var(--paper);
  border-color: #6c675e;
  background: transparent;
}

.slide-stage {
  display: grid;
  min-height: 0;
  place-items: center;
  padding: 28px;
  overflow: auto;
  container-type: size;
}

.slide-frame {
  width: min(100%, calc(100cqh * 16 / 9), 1050px);
  aspect-ratio: 16 / 9;
  background: var(--paper);
}

.slide {
  position: relative;
  display: grid;
  width: 100%;
  height: 100%;
  grid-template-rows: auto 1fr auto;
  padding: clamp(28px, 4vw, 67px);
  overflow: hidden;
  color: var(--ink);
  background: var(--paper);
}

.slide::after {
  position: absolute;
  top: 0;
  right: 0;
  width: 17px;
  height: 100%;
  background: var(--red);
  content: "";
}

.slide-eyebrow {
  position: relative;
  z-index: 1;
  font-family: var(--mono);
  font-size: clamp(0.48rem, 1vw, 0.7rem);
  letter-spacing: 0.08em;
}

.slide-content {
  position: relative;
  z-index: 1;
  align-self: center;
}

.slide h2 {
  max-width: 850px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 4.3vw, 4.8rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 1.22;
}

.slide .slide-lead {
  max-width: 760px;
  margin: clamp(12px, 2.2vw, 26px) 0 0;
  color: var(--muted);
  font-size: clamp(0.72rem, 1.4vw, 1.1rem);
  line-height: 1.8;
}

.slide-items {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(13px, 2.3vw, 27px);
  border-top: 1px solid var(--ink);
}

.slide-item {
  min-height: clamp(45px, 7vw, 82px);
  padding: clamp(7px, 1.4vw, 15px);
  border-right: 1px solid var(--line-dark);
  font-size: clamp(0.55rem, 1.1vw, 0.9rem);
  line-height: 1.6;
}

.slide-item:last-child {
  border-right: 0;
}

.slide-prompt {
  position: relative;
  z-index: 1;
  max-width: 76%;
  padding-top: clamp(8px, 1.5vw, 17px);
  border-top: 1px solid var(--line-dark);
  font-family: var(--serif);
  font-size: clamp(0.62rem, 1.25vw, 0.98rem);
  font-weight: 600;
}

.player-controls {
  display: grid;
  min-height: 68px;
  align-items: center;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  padding: 11px 22px;
  color: var(--paper);
  border-top: 1px solid #47443f;
}

.control-group {
  display: flex;
}

.control-button {
  display: grid;
  width: 43px;
  height: 39px;
  place-items: center;
  border: 1px solid #6c675e;
  border-radius: 0;
  background: transparent;
  color: var(--paper);
  cursor: pointer;
}

.control-button + .control-button {
  border-left: 0;
}

.control-button:disabled {
  opacity: 0.3;
  cursor: default;
}

.progress-track {
  height: 1px;
  background: #555149;
}

.progress-bar {
  width: 0;
  height: 100%;
  background: var(--red);
  transition: width 180ms ease;
}

.slide-counter {
  font-family: var(--mono);
  font-size: 0.67rem;
}

.sheet-dialog {
  width: min(96vw, 1030px);
  height: min(94vh, 940px);
}

.sheet-dialog-head,
.knowledge-dialog-head {
  position: sticky;
  z-index: 3;
  top: 0;
  display: flex;
  min-height: 66px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 18px 12px 26px;
  color: var(--paper);
  border-bottom: 1px solid #4c4943;
  background: var(--ink);
}

.sheet-dialog-head h2,
.knowledge-dialog-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
}

.sheet-dialog-head .dialog-close,
.knowledge-dialog-head .dialog-close {
  color: var(--paper);
}

.worksheet-wrap {
  height: calc(100% - 66px);
  padding: 34px;
  overflow: auto;
  background: #ddd8cd;
}

.worksheet {
  width: min(100%, 794px);
  min-height: 1123px;
  margin: 0 auto;
  padding: 52px 58px;
  color: #171714;
  background: #fff;
  box-shadow: 8px 8px 0 rgba(29, 28, 25, 0.12);
}

.worksheet-meta {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid #171714;
  font-family: var(--mono);
  font-size: 0.6rem;
}

.worksheet h1 {
  margin: 33px 0 15px;
  font-family: var(--serif);
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.04em;
}

.worksheet-intro {
  margin: 0 0 25px;
  font-size: 0.8rem;
  line-height: 1.85;
}

.worksheet-instructions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid #171714;
  border-bottom: 1px solid #171714;
}

.worksheet-instructions span {
  padding: 10px;
  border-right: 1px solid #aaa;
  font-size: 0.65rem;
}

.worksheet-instructions span:last-child {
  border-right: 0;
}

.worksheet-section {
  margin-top: 30px;
}

.worksheet-section h3 {
  margin: 0 0 7px;
  font-family: var(--serif);
  font-size: 0.93rem;
}

.worksheet-section p {
  margin: 0;
  font-size: 0.72rem;
}

.worksheet-save-note { margin: 18px 0 0; padding: 10px; background: #eee8db; border-left: 5px solid var(--red); font-size: .65rem; line-height: 1.65; }
.worksheet-section textarea { width: 100%; margin-top: 10px; padding: 10px; color: #171714; background: rgba(255,255,255,.64); border: 1px solid #777; border-radius: 0; font: inherit; font-size: .75rem; line-height: 1.75; resize: vertical; }
.worksheet-section textarea + .writing-lines { display: none; }

.writing-lines {
  min-height: 110px;
  margin-top: 10px;
  border-top: 1px solid #aaa;
  background: repeating-linear-gradient(to bottom, transparent 0, transparent 27px, #c8c8c8 28px);
}

.knowledge-dialog {
  width: min(94vw, 930px);
  max-height: 90vh;
  overflow: auto;
}

.knowledge-detail {
  padding: 45px 52px 53px;
}

.detail-meta {
  display: flex;
  gap: 12px;
}

.detail-definition {
  margin: 28px 0 38px;
  padding-left: 21px;
  border-left: 5px solid var(--red);
  font-family: var(--serif);
  font-size: 1.33rem;
  line-height: 1.9;
}

.detail-language-intro {
  margin-top: 28px;
  padding: 20px 0;
  border-top: 6px solid var(--red);
  border-bottom: 1px solid var(--ink);
}

.detail-language-intro > span,
.detail-language-intro > small {
  display: block;
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: .62rem;
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: .06em;
}

.detail-language-intro h3 {
  margin: 16px 0 7px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .65rem;
  letter-spacing: .07em;
}

.detail-language-intro p {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-size: 1.22rem;
  line-height: 1.75;
}

.ontology-relations,
.ontology-applications {
  margin: 38px 0;
  border-top: 6px solid var(--ink);
}

.ontology-applications {
  border-top-color: var(--red);
}

.ontology-relations header,
.ontology-applications header {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 7px 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--ink);
}

.ontology-relations header span,
.ontology-applications header span {
  grid-row: span 2;
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: .59rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.ontology-relations header h3,
.ontology-applications header h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.2rem;
}

.ontology-relations header p,
.ontology-applications header p {
  margin: 0;
  color: var(--muted);
  font-size: .72rem;
  line-height: 1.65;
}

.ontology-relations > div,
.ontology-applications > div {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-left: 1px solid var(--ink);
}

.ontology-relations a,
.ontology-applications a {
  display: grid;
  min-height: 165px;
  align-content: start;
  gap: 9px;
  padding: 18px;
  color: inherit;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  text-decoration: none;
}

.ontology-relations a:hover,
.ontology-applications a:hover {
  background: #ece4d5;
}

.ontology-relations a span,
.ontology-applications a span,
.ontology-applications a small {
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: .58rem;
  line-height: 1.45;
}

.ontology-relations a strong,
.ontology-applications a strong {
  font-family: var(--serif);
  font-size: .92rem;
  line-height: 1.45;
}

.ontology-relations a p,
.ontology-applications a p {
  margin: 0;
  color: var(--muted);
  font-size: .71rem;
  line-height: 1.7;
}

.ontology-applications a small {
  margin-top: auto;
  color: var(--muted);
}

.level-timeline {
  border-top: 1px solid var(--ink);
}

.level-row {
  display: grid;
  align-items: start;
  grid-template-columns: 49px 157px 1fr;
  gap: 15px;
  padding: 19px 0;
  border-bottom: 1px solid var(--line);
}

.level-badge {
  padding: 3px 0;
  color: var(--red-dark);
  border-bottom: 1px solid currentColor;
  font-family: var(--mono);
  font-size: 0.69rem;
  font-weight: 600;
  text-align: center;
}

.placement {
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.6;
}

.level-row p {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.85;
}

.detail-section {
  margin-top: 38px;
  padding: 25px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.detail-section h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 1.05rem;
}

.detail-section p {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.detail-source {
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 0.7rem;
}

@media (max-width: 680px) {
  .ontology-relations header,
  .ontology-applications header {
    grid-template-columns: 1fr;
  }

  .ontology-relations header span,
  .ontology-applications header span {
    grid-row: auto;
  }

  .ontology-relations > div,
  .ontology-applications > div {
    grid-template-columns: 1fr;
  }
}

/* Footer */
.site-footer {
  padding: 74px 0 26px;
  color: #d4cec3;
  background: var(--ink);
}

.site-footer .brand-mark {
  color: var(--ink);
  background: var(--paper);
}

.site-footer .brand-type {
  border-color: #6e6961;
}

.site-footer .brand-type small {
  color: #a9a297;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 0.65fr 0.9fr;
  gap: 75px;
}

.footer-copy {
  max-width: 440px;
  margin: 27px 0 0;
  color: #aaa399;
  font-size: 0.75rem;
  line-height: 1.9;
}

.footer-nav h2 {
  margin: 0 0 22px;
  color: #8f887e;
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-nav a {
  display: block;
  width: fit-content;
  margin: 9px 0;
  font-size: 0.75rem;
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--white);
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  margin-top: 65px;
  padding-top: 18px;
  color: #777168;
  border-top: 1px solid #4c4943;
  font-family: var(--mono);
  font-size: 0.57rem;
  letter-spacing: 0.08em;
}

.footer-bottom .footer-about {
  color: #d4cec3;
  text-decoration: none;
  border-bottom: 1px solid #777168;
}

.footer-bottom .footer-about:hover,
.footer-bottom .footer-about:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* Motion */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 480ms ease, transform 480ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.no-js .reveal {
  opacity: 1;
  transform: none;
}

@media (max-width: 1050px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(330px, 0.92fr);
    gap: 52px;
  }

  .hero h1 {
    font-size: clamp(3.7rem, 7vw, 5.8rem);
  }

  .school-card {
    padding-inline: 24px;
  }

  .school-card h3 {
    font-size: 2.8rem;
  }

  .deck-body {
    min-height: 390px;
  }

  .knowledge-shell {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 32px;
  }
}

@media (max-width: 840px) {
  .container {
    width: min(calc(100% - 40px), var(--max-width));
  }

  .nav-shell {
    min-height: 72px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 12px 20px 20px;
    border-bottom: 1px solid var(--ink);
    background: var(--paper);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a,
  .site-nav .nav-cta {
    padding: 14px 4px;
    border: 0;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav .nav-cta:hover,
  .site-nav .nav-cta[aria-current="page"] {
    color: var(--ink);
    background: transparent;
  }

  .hero {
    padding: 58px 0 64px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 68px;
  }

  .hero-copy {
    padding-top: 0;
  }

  .hero h1 {
    font-size: clamp(4rem, 12.5vw, 6.6rem);
  }

  .hero-lead {
    max-width: 620px;
  }

  .hero-visual {
    width: min(100%, 500px);
    margin-left: auto;
  }

  .stats-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat:nth-child(2) {
    border-right: 0;
  }

  .stat:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .section,
  .section-tight {
    padding: 88px 0;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .school-grid,
  .featured-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .school-card,
  .school-card:first-child,
  .school-card:last-child {
    min-height: 305px;
    padding: 26px 0 32px;
    border-right: 0;
    border-bottom: 1px solid var(--line-dark);
  }

  .school-card h3 {
    margin-top: 30px;
  }

  .school-card p {
    max-width: 540px;
    margin-top: 27px;
  }

  .deck-card,
  .deck-card:nth-child(3n + 1) {
    display: grid;
    grid-template-columns: minmax(225px, 0.74fr) minmax(0, 1.26fr);
    border-left: 1px solid var(--line);
  }

  .deck-cover {
    min-height: 100%;
  }

  .deck-body {
    min-height: 345px;
  }

  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-step,
  .process-step:first-child {
    min-height: 250px;
    padding: 24px;
    border-bottom: 1px solid #5a5650;
  }

  .process-step:nth-child(2) {
    border-right: 0;
  }

  .process-step:nth-child(2)::after {
    display: none;
  }

  .category-cloud {
    grid-template-columns: repeat(2, 1fr);
  }

  .category-chip-card:nth-child(3n + 1) {
    border-left: 0;
  }

  .category-chip-card:nth-child(2n + 1) {
    border-left: 1px solid var(--line);
  }

  .source-panel {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .page-hero {
    padding: 63px 0;
  }

  .page-hero .container {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .page-hero h1 {
    font-size: clamp(3.8rem, 10vw, 6rem);
  }

  .toolbar {
    top: 72px;
  }

  .toolbar-shell {
    align-items: stretch;
    flex-direction: column;
    gap: 12px;
  }

  .search-field {
    max-width: none;
  }

  .material-grid {
    grid-template-columns: 1fr;
  }

  .material-card,
  .material-card:nth-child(2n + 1) {
    border-left: 1px solid var(--line);
  }

  .capability-cards {
    grid-template-columns: 1fr;
  }

  .capability-card,
  .capability-card:first-child {
    min-height: auto;
    border-left: 1px solid var(--line);
  }

  .capability-card h3 {
    margin-top: 18px;
  }

  .knowledge-shell {
    grid-template-columns: 1fr;
  }

  .category-nav {
    position: static;
    display: flex;
    max-height: none;
    overflow: auto;
    border-bottom: 1px solid var(--line-dark);
  }

  .category-nav button {
    min-width: 135px;
    grid-template-columns: 25px 1fr;
    padding: 11px;
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }

  .category-nav button[aria-pressed="true"] {
    box-shadow: inset 0 -3px var(--red);
  }

  .category-nav .nav-count {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1.4fr 0.6fr;
  }

  .footer-nav:last-child {
    grid-column: 2;
  }
}

@media (max-width: 600px) {
  .container {
    width: min(calc(100% - 30px), var(--max-width));
  }

  .brand-type small {
    display: none;
  }

  .hero {
    padding-top: 42px;
  }

  .eyebrow {
    margin-bottom: 20px;
    font-size: 0.61rem;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(3.25rem, 16vw, 5.2rem);
    line-height: 1.08;
  }

  .hero-lead {
    margin-top: 25px;
    font-size: 0.87rem;
    line-height: 1.9;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button-secondary {
    border-top: 0;
    border-left: 1px solid var(--ink);
  }

  .atlas-board {
    min-height: 450px;
    padding: 22px;
  }

  .atlas-core strong {
    font-size: 4.5rem;
  }

  .orbit-card {
    grid-template-columns: 30px 1fr;
  }

  .orbit-card small {
    display: none;
  }

  .stats-strip {
    width: calc(100% + 30px);
    margin-left: -15px;
  }

  .stat,
  .stat:first-child {
    min-height: 95px;
    padding: 22px 15px;
  }

  .stat strong {
    font-size: 2.7rem;
  }

  .section,
  .section-tight {
    padding: 70px 0;
  }

  .section-head {
    margin-bottom: 42px;
  }

  .section-head h2,
  .source-panel h2 {
    font-size: clamp(2.35rem, 11vw, 3.6rem);
  }

  .school-card h3 {
    font-size: 2.7rem;
  }

  .deck-card,
  .deck-card:nth-child(3n + 1) {
    display: flex;
    border-left: 1px solid var(--line);
  }

  .deck-cover {
    min-height: 230px;
  }

  .deck-body {
    min-height: 345px;
  }

  .process-grid,
  .category-cloud,
  .knowledge-results {
    grid-template-columns: 1fr;
  }

  .process-step,
  .process-step:first-child {
    min-height: 210px;
    padding: 24px 0;
    border-right: 0;
  }

  .process-step::after {
    display: none;
  }

  .process-step h3 {
    margin-top: 28px;
  }

  .category-chip-card,
  .category-chip-card:nth-child(2n + 1),
  .category-chip-card:nth-child(3n + 1) {
    border-left: 1px solid var(--line);
  }

  .source-panel {
    gap: 33px;
    padding: 34px 0 34px 21px;
    border-left-width: 6px;
  }

  .page-hero .container {
    display: block;
  }

  .page-kicker {
    margin-bottom: 18px;
    padding: 0;
    writing-mode: initial;
  }

  .page-kicker span {
    margin: 0 10px 0 0;
    font-size: 1.3rem;
  }

  .page-hero .hero-lead {
    margin-top: 25px;
  }

  .page-hero .stats-strip {
    width: 100%;
    margin-left: 0;
  }

  .process-rail {
    grid-template-columns: repeat(2, 1fr);
  }

  .rail-step {
    border-bottom: 1px solid var(--line);
  }

  .toolbar {
    position: relative;
    top: auto;
  }

  .filter-group {
    gap: 4px 13px;
  }

  .catalog-section {
    padding: 40px 0 80px;
  }

  .material-card {
    display: block;
    min-height: 405px;
    padding: 24px 21px;
  }

  .material-icon {
    margin-bottom: 18px;
  }

  .knowledge-card,
  .knowledge-card:nth-child(2n + 1) {
    min-height: 230px;
    border-left: 1px solid var(--line);
  }

  .player-head .button {
    display: none;
  }

  .slide-dialog {
    width: 100vw;
    height: 100dvh;
    border: 0;
    box-shadow: none;
  }

  .slide-stage {
    padding: 9px;
  }

  .slide {
    padding: 12px 20px;
  }

  .slide-eyebrow { font-size: 0.4rem; }

  .slide h2 {
    font-size: 1.25rem;
    line-height: 1.12;
  }

  .slide .slide-lead {
    margin-top: 6px;
    font-size: 0.55rem;
    line-height: 1.45;
  }

  .slide::after {
    width: 7px;
  }

  .slide-items {
    grid-template-columns: repeat(3, 1fr);
    margin-top: 7px;
  }

  .slide-item {
    min-height: 28px;
    padding: 4px;
    font-size: 0.43rem;
    line-height: 1.35;
  }

  .slide-prompt {
    max-width: 92%;
    padding-top: 5px;
    font-size: 0.48rem;
    line-height: 1.35;
  }

  .slide-prompt span { margin-bottom: 2px; font-size: 0.36rem; }

  .slide[data-kind="reconsider"] .slide-content::before { width: 28px; margin-bottom: 7px; border-top-width: 2px; }

  .player-controls {
    padding-inline: 12px;
  }

  .sheet-dialog,
  .knowledge-dialog {
    width: 100vw;
    height: 100dvh;
    max-height: none;
    border: 0;
    box-shadow: none;
  }

  .worksheet-wrap {
    padding: 12px;
  }

  .worksheet {
    min-height: 900px;
    padding: 31px 23px;
  }

  .worksheet-meta,
  .worksheet-instructions {
    grid-template-columns: 1fr;
    flex-direction: column;
  }

  .worksheet-instructions span {
    border-right: 0;
    border-bottom: 1px solid #aaa;
  }

  .knowledge-detail {
    padding: 32px 22px;
  }

  .detail-definition {
    font-size: 1.1rem;
  }

  .level-row {
    grid-template-columns: 40px 1fr;
  }

  .level-row p {
    grid-column: 1 / -1;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .footer-nav:last-child {
    grid-column: auto;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }
}

/* HTML lesson canvas — story, explicit agents, and manipulable concept diagrams. */
.slide-frame { container-type: inline-size; }
.slide {
  display: grid;
  padding: 0;
  grid-template-rows: 7.3cqw minmax(0, 1fr) 10.4cqw;
  background: #f4f0e7;
}
.slide::after { width: .72cqw; }
.slide-story-strip {
  position: relative;
  z-index: 2;
  display: grid;
  min-width: 0;
  grid-template-columns: 20cqw minmax(0, 1fr);
  align-items: stretch;
  border-bottom: 1px solid currentColor;
}
.slide-story-strip > .slide-eyebrow {
  display: flex;
  align-items: center;
  padding: 0 2.1cqw;
  border-right: 1px solid currentColor;
  font-size: .82cqw;
  line-height: 1.35;
}
.slide-story-strip > div { display: grid; min-width: 0; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.slide-story-strip > div > span {
  display: grid;
  min-width: 0;
  align-content: center;
  padding: .72cqw .88cqw;
  border-right: 1px solid rgba(29, 28, 25, .24);
}
.slide-story-strip > div > span:last-child { border-right: 0; }
.slide-story-strip b { color: var(--muted); font: 700 .82cqw/1.2 var(--mono); letter-spacing: .05em; }
.slide-story-strip small {
  margin-top: .25cqw;
  overflow: hidden;
  color: var(--muted);
  font-size: .8cqw;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.slide-story-strip .is-current { color: var(--paper); background: var(--ink); }
.slide-story-strip .is-current b { color: #efbd6b; }
.slide-story-strip .is-current small { color: #e2ded5; }

.slide-main {
  display: grid;
  min-width: 0;
  min-height: 0;
  grid-template-columns: minmax(0, 42fr) minmax(0, 58fr);
}
.slide-content {
  display: flex;
  min-width: 0;
  min-height: 0;
  align-self: stretch;
  flex-direction: column;
  padding: 1.55cqw 1.7cqw 1.1cqw 2.65cqw;
  border-right: 1px solid currentColor;
}
.slide-scene {
  display: -webkit-box;
  margin: 0 0 .75cqw;
  overflow: hidden;
  color: var(--muted);
  font-size: .69cqw;
  line-height: 1.45;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}
.slide-scene span {
  display: inline-block;
  margin-right: .55cqw;
  color: var(--red-dark);
  font: 700 .58cqw/1.4 var(--mono);
  letter-spacing: .06em;
}
.slide h2 {
  max-width: none;
  margin: 0;
  font-size: clamp(1rem, 3.2cqw, 2.9rem);
  line-height: 1.13;
  letter-spacing: -.055em;
}
.slide[data-title-length="long"] h2 { font-size: clamp(.82rem, 2.36cqw, 2.3rem); line-height: 1.17; }
.slide .slide-lead {
  display: -webkit-box;
  max-width: none;
  margin: .85cqw 0 0;
  overflow: hidden;
  color: var(--muted);
  font-size: clamp(.48rem, .94cqw, .95rem);
  line-height: 1.58;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}
.slide-subject {
  margin: auto 0 0;
  padding: .8cqw 0 0;
  border-top: .42cqw solid var(--red);
}
.slide-subject span { display: block; margin-bottom: .35cqw; color: var(--red-dark); font: 700 .66cqw/1 var(--mono); letter-spacing: .06em; }
.slide-subject strong { display: block; font-family: var(--serif); font-size: 1.16cqw; line-height: 1.44; }
.slide-continuity { display: grid; margin: .65cqw 0 0; grid-template-columns: 1fr 1fr; }
.slide-continuity span { padding-right: .6cqw; color: var(--muted); font-size: .64cqw; line-height: 1.38; }
.slide-continuity span + span { padding-right: 0; padding-left: .6cqw; border-left: 1px solid var(--line-dark); }

.slide-visual { min-width: 0; min-height: 0; padding: 1.35cqw 2.35cqw 1.2cqw 1.7cqw; }
.slide-figure { display: grid; height: 100%; min-height: 0; margin: 0; grid-template-rows: auto 1fr auto auto; }
.figure-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1cqw; padding-bottom: .7cqw; border-bottom: 1px solid currentColor; }
.figure-heading span { color: var(--red-dark); font: 700 .7cqw/1 var(--mono); letter-spacing: .06em; }
.figure-heading strong { font-family: var(--serif); font-size: 1.1cqw; font-weight: 600; }
.slide-figure button { color: inherit; background: transparent; border: 0; border-radius: 0; font: inherit; cursor: pointer; }
.slide-figure button:focus-visible, .slide-quick-record input:focus-visible { outline: .25cqw solid #d9a23c; outline-offset: .16cqw; }
.slide-figure button:disabled { cursor: default; opacity: .35; }
.slide-figure figcaption {
  display: grid;
  grid-template-columns: minmax(8.5cqw, .65fr) 1.35fr;
  gap: .8cqw;
  align-items: baseline;
  padding: .7cqw 0 0;
  border-top: 1px solid currentColor;
}
.slide-figure figcaption b { color: var(--red-dark); font-family: var(--serif); font-size: .88cqw; line-height: 1.35; }
.slide-figure figcaption span { font-size: .8cqw; line-height: 1.38; }

.flow-nodes, .revision-track, .evidence-ladder {
  display: grid;
  min-height: 0;
  align-items: center;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.flow-node, .revision-node, .evidence-rung {
  position: relative;
  display: grid;
  min-height: 9.2cqw;
  align-content: center;
  gap: .65cqw;
  padding: 1cqw .78cqw !important;
  border: 1px solid currentColor !important;
  border-left: 0 !important;
  text-align: left;
}
.flow-node:first-child, .revision-node:first-child, .evidence-rung:first-child { border-left: 1px solid currentColor !important; }
.flow-node:not(:last-child)::after {
  position: absolute;
  z-index: 2;
  top: 50%;
  right: -.52cqw;
  width: 1cqw;
  height: 1cqw;
  transform: translateY(-50%) rotate(45deg);
  border-top: 1px solid currentColor;
  border-right: 1px solid currentColor;
  background: #f4f0e7;
  content: "";
}
.flow-node span, .revision-node span, .evidence-rung span { color: var(--muted); font: 700 .64cqw/1 var(--mono); }
.flow-node strong, .revision-node strong, .evidence-rung strong { font-family: var(--serif); font-size: .98cqw; line-height: 1.34; }
.flow-node.is-active, .revision-node.is-active, .evidence-rung.is-active { color: var(--paper); background: var(--ink); }
.flow-node.is-active span, .revision-node.is-active span, .evidence-rung.is-active span { color: #efbd6b; }
.flow-node.is-active::after { background: var(--ink); }
.figure-step-controls { display: flex; align-items: center; justify-content: flex-end; gap: .8cqw; padding-top: .55cqw; }
.figure-step-controls button { padding: .36cqw .58cqw; border: 1px solid currentColor; font-size: .58cqw; }
.figure-step-controls span { color: var(--muted); font: .55cqw/1 var(--mono); }

.story-steps { display: grid; min-height: 0; align-items: center; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.story-step { display: grid; min-height: 11cqw; align-content: center; gap: .6cqw; padding: .9cqw !important; border-top: 1px solid currentColor !important; border-bottom: 1px solid currentColor !important; border-left: 1px solid currentColor !important; text-align: left; }
.story-step:last-child { border-right: 1px solid currentColor !important; }
.story-step span { color: var(--red-dark); font: 700 .6cqw/1 var(--mono); }
.story-step strong { font-family: var(--serif); font-size: 1.12cqw; }
.story-step small { color: var(--muted); font-size: .66cqw; line-height: 1.4; }
.story-step.is-active { color: var(--paper); background: var(--ink); }
.story-step.is-active span { color: #efbd6b; }
.story-step.is-active small { color: #e2ded5; }

.concept-orbit { position: relative; min-height: 0; }
.orbit-core { position: absolute; z-index: 2; top: 50%; left: 50%; display: grid; width: 14cqw; min-height: 7.4cqw; align-content: center; padding: 1cqw; transform: translate(-50%, -50%); color: var(--paper); background: var(--ink); text-align: center; }
.orbit-core span { color: #efbd6b; font: .55cqw/1 var(--mono); }
.orbit-core strong { margin-top: .45cqw; font-family: var(--serif); font-size: .82cqw; line-height: 1.35; }
.orbit-node { position: absolute; width: 11.5cqw; min-height: 3.5cqw; padding: .65cqw !important; border: 1px solid currentColor !important; font-size: .65cqw !important; line-height: 1.35; }
.orbit-node.is-active { color: var(--paper); background: var(--red-dark); }
.orbit-1 { top: 8%; left: 3%; }.orbit-2 { top: 8%; right: 3%; }.orbit-3 { bottom: 8%; left: 3%; }.orbit-4 { right: 3%; bottom: 8%; }.orbit-5 { bottom: 3%; left: 50%; transform: translateX(-50%); }
.orbit-node::after { position: absolute; z-index: -1; width: 6cqw; border-top: 1px solid currentColor; content: ""; }
.orbit-1::after, .orbit-3::after { left: 100%; }.orbit-2::after, .orbit-4::after { right: 100%; }

.comparison-pair { display: grid; min-height: 0; align-items: center; grid-template-columns: 1fr 1fr; gap: 1cqw; }
.comparison-option { display: grid; min-height: 9.5cqw; align-content: center; gap: .8cqw; padding: 1cqw !important; border: 1px solid currentColor !important; text-align: left; }
.comparison-option span { color: var(--red-dark); font: 700 .58cqw/1 var(--mono); }
.comparison-option strong { font-family: var(--serif); font-size: .87cqw; line-height: 1.45; }
.comparison-option.is-active { color: var(--paper); background: var(--ink); }
.comparison-option.is-active span { color: #efbd6b; }
.evidence-slider { display: grid; grid-template-columns: 8cqw 1fr 12cqw; gap: .8cqw; align-items: center; padding: .55cqw 0; }
.evidence-slider span { color: var(--muted); font: .57cqw/1 var(--mono); }
.evidence-slider input { width: 100%; accent-color: var(--red-dark); }
.evidence-slider output { font-family: var(--serif); font-size: .64cqw; }
.evidence-rung.is-filled, .revision-node.is-open { box-shadow: inset 0 -.42cqw 0 var(--red); }

.slide-task {
  position: relative;
  z-index: 2;
  display: grid;
  min-width: 0;
  grid-template-columns: 1.3fr .7fr;
  border-top: 1px solid currentColor;
}
.slide-prompt { max-width: none; padding: 1.05cqw 1.4cqw 1cqw 2.65cqw; border-top: 0; }
.slide-prompt span { margin-bottom: .35cqw; font-size: .64cqw; }
.slide-prompt strong { display: block; font-size: .96cqw; line-height: 1.36; }
.slide-quick-record { display: grid; min-width: 0; align-content: center; padding: .8cqw 2.3cqw .8cqw 1.1cqw; border-left: 1px solid currentColor; }
.slide-quick-record span { margin-bottom: .4cqw; color: var(--red-dark); font: 700 .54cqw/1 var(--mono); }
.slide-quick-record input { width: 100%; min-width: 0; padding: .52cqw .65cqw; color: inherit; background: rgba(255, 255, 255, .35); border: 1px solid currentColor; border-radius: 0; font: .62cqw/1.3 var(--sans); }

.slide[data-kind="opening"] .slide-story-strip .is-current,
.slide[data-kind="opening"] .flow-node.is-active,
.slide[data-kind="opening"] .story-step.is-active,
.slide[data-kind="opening"] .comparison-option.is-active,
.slide[data-kind="opening"] .orbit-core,
.slide[data-kind="opening"] .revision-node.is-active,
.slide[data-kind="opening"] .evidence-rung.is-active { color: var(--ink); background: #efbd6b; }
.slide[data-kind="opening"] .slide-scene,
.slide[data-kind="opening"] .slide-lead,
.slide[data-kind="opening"] .slide-continuity span,
.slide[data-kind="opening"] .story-step small,
.slide[data-kind="opening"] .figure-step-controls span { color: #c7c0b5; }
.slide[data-kind="opening"] .flow-node:not(:last-child)::after { background: var(--ink); }
.slide[data-kind="opening"] .flow-node.is-active::after { background: #efbd6b; }
.slide[data-kind="opening"] .slide-quick-record input { background: rgba(255, 255, 255, .08); }

@media (max-width: 760px) {
  .slide-dialog { width: 100vw; height: 100dvh; max-width: none; max-height: none; }
  .slide-stage { padding: 8px; }
}

/* 2026 editorial slide system: one message, one illustration, one learner action. */
.slide-editorial {
  grid-template-rows: 5.6cqw minmax(0, 1fr) 10.8cqw;
  background: #f4f0e7;
}
.slide-minimal-head {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1cqw;
  padding: 0 2.3cqw 0 2.65cqw;
  border-bottom: 1px solid currentColor;
}
.slide-minimal-head > div { display: flex; align-items: center; gap: .7cqw; }
.slide-minimal-head > div span { color: var(--muted); font: 700 .62cqw/1 var(--mono); }
.slide-minimal-head > div b { padding: .3cqw .55cqw; color: var(--paper); background: var(--ink); font: 700 .62cqw/1 var(--mono); letter-spacing: .05em; }
.slide-editorial .slide-main { grid-template-columns: minmax(0, 42fr) minmax(0, 58fr); }
.slide-editorial .slide-main.is-experiment { grid-template-columns: minmax(0, 29fr) minmax(0, 71fr); }
.slide-editorial .slide-main.is-choice { grid-template-columns: minmax(0, 35fr) minmax(0, 65fr); }
.slide-editorial .slide-content {
  padding: 2cqw 1.7cqw 1.45cqw 2.65cqw;
  justify-content: flex-start;
}
.slide-message-label { margin: 0 0 .72cqw; color: var(--red-dark); font: 700 .62cqw/1 var(--mono); letter-spacing: .08em; }
.slide-editorial h2 { font-size: clamp(1rem, 3.35cqw, 3.05rem); line-height: 1.08; line-break: strict; white-space: pre-line; word-break: auto-phrase; }
.slide-editorial[data-title-length="long"] h2 { font-size: clamp(.9rem, 2.65cqw, 2.55rem); line-height: 1.13; }
.slide-editorial .slide-lead { margin-top: 1cqw; font-size: clamp(.5rem, 1.02cqw, .98rem); line-height: 1.6; -webkit-line-clamp: 4; }
.slide-illustration-panel { padding: 1.25cqw 2.3cqw 1.15cqw 1.45cqw; }
.lesson-illustration { display: grid; height: 100%; min-height: 0; margin: 0; grid-template-rows: minmax(0, 1fr); }
.lesson-illustration-crop { position: relative; min-height: 0; overflow: hidden; border: 1px solid var(--ink); background: #e9e1d3; }
.lesson-illustration-crop img {
  position: absolute;
  top: 0;
  left: 0;
  width: 300%;
  max-width: none;
  height: 200%;
  object-fit: cover;
  transform: translate(calc(var(--scene-column) * -33.333333%), calc(var(--scene-row) * -50%));
}
.lesson-illustration figcaption { display: grid; grid-template-columns: 5.5cqw 1fr; gap: .7cqw; padding: .55cqw 0 .45cqw; border-bottom: 1px solid var(--line-dark); }
.lesson-illustration figcaption span { color: var(--red-dark); font: 700 .56cqw/1.3 var(--mono); }
.lesson-illustration figcaption strong { font-size: .66cqw; font-weight: 600; line-height: 1.4; }
.illustration-focus { display: flex; justify-content: flex-end; gap: .35cqw; padding-top: .45cqw; }
.illustration-focus button { padding: .3cqw .5cqw; color: inherit; border: 1px solid currentColor; border-radius: 0; background: transparent; font: 700 .52cqw/1 var(--sans); cursor: pointer; }
.illustration-focus button[aria-pressed="true"] { color: var(--paper); background: var(--ink); }
.illustration-focus button:focus-visible { outline: .2cqw solid #d9a23c; outline-offset: .12cqw; }
.lesson-illustration.is-compact { height: auto; min-height: 0; margin-top: auto; grid-template-rows: 8.2cqw; }
.lesson-illustration.is-compact figcaption { display: block; padding-top: .42cqw; border-bottom: 0; }
.lesson-illustration.is-compact figcaption span { display: none; }
.lesson-illustration.is-compact figcaption strong { display: -webkit-box; overflow: hidden; font-size: .57cqw; line-height: 1.35; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.slide-editorial .slide-task { grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr); }
.slide-editorial .slide-prompt { display: grid; align-content: center; padding: .85cqw 1.2cqw .85cqw 2.65cqw; }
.slide-editorial .slide-prompt strong { font-size: .86cqw; line-height: 1.4; }
.slide-editorial .slide-quick-record { padding: .7cqw 2.3cqw .7cqw 1cqw; }
.slide-editorial .slide-quick-record span { display: block; margin-bottom: .32cqw; color: var(--muted); font: 700 .54cqw/1 var(--mono); }
.slide-editorial .slide-quick-record textarea { width: 100%; min-height: 3.8cqw; padding: .48cqw .62cqw; resize: none; color: var(--ink); border: 1px solid var(--line-dark); border-radius: 0; background: rgba(255,255,255,.72); font: .7cqw/1.35 var(--sans); }
.slide-editorial .slide-quick-record.is-required textarea { border-width: .2cqw; border-color: var(--red-dark); background: #fff9ef; }
.slide-editorial[data-kind="prediction"] { background: #f7eee5; }
.slide-editorial[data-kind="prediction"]::after { background: #d9a23c; }
.slide-editorial[data-kind="prediction"] .slide-message-label { color: #8a5a11; }
.slide-editorial[data-kind="opening"] .slide-minimal-head > div b { color: var(--ink); background: #efbd6b; }
.slide-editorial[data-kind="opening"] .lesson-illustration figcaption strong,
.slide-editorial[data-kind="opening"] .slide-quick-record span { color: #d7d0c4; }
.slide-editorial[data-kind="opening"] .lesson-illustration-crop,
.slide-editorial[data-kind="opening"] .slide-quick-record textarea { border-color: #8a8479; }
.slide-editorial .slide-concept-experiment { padding: .75cqw 1.45cqw .75cqw .9cqw !important; }
.slide-editorial .slide-concept-experiment .concept-experiment { border: 1px solid var(--ink); }
.slide-choice-panel { padding: .8cqw 2.3cqw .8cqw 1.2cqw; }
.learner-choice-experience { display: grid; height: 100%; min-height: 0; grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr); gap: .8cqw; }
.learner-choice-experience .lesson-illustration.is-compact { height: 100%; margin-top: 0; align-self: stretch; grid-template-rows: minmax(0, 1fr); }
.learner-choice-options { display: grid; min-height: 0; grid-template-rows: repeat(2, minmax(0, 1fr)); gap: .7cqw; }
.learner-choice-options button { display: grid; min-height: 0; padding: 1cqw; text-align: left; color: var(--ink); border: 1px solid var(--ink); border-radius: 0; background: transparent; cursor: pointer; }
.learner-choice-options button span { color: var(--red-dark); font: 800 .58cqw/1 var(--mono); letter-spacing: .08em; }
.learner-choice-options button strong { align-self: center; font-size: .78cqw; line-height: 1.42; }
.learner-choice-options button[aria-pressed="true"] { color: var(--paper); background: var(--ink); }
.learner-choice-options button[aria-pressed="true"] span { color: #efbd6b; }
.learner-choice-options button:focus-visible { outline: .2cqw solid #d9a23c; outline-offset: .12cqw; }

@media (max-width: 760px) {
  .slide-editorial { display: grid; grid-template-rows: auto auto auto; }
  .slide-minimal-head { min-height: 48px; padding: .7rem 1rem; }
  .slide-minimal-head .slide-eyebrow { font-size: .6rem; }
  .slide-minimal-head > div span, .slide-minimal-head > div b { font-size: .55rem; }
  .slide-editorial .slide-main, .slide-editorial .slide-main.is-experiment, .slide-editorial .slide-main.is-choice { display: block; }
  .slide-editorial .slide-content { min-height: 0; padding: 1.35rem 1.1rem; }
  .slide-message-label { margin-bottom: .65rem; font-size: .58rem; }
  .slide-editorial h2, .slide-editorial[data-title-length="long"] h2 { font-size: clamp(1.65rem, 7.5vw, 2.25rem); }
  .slide-editorial .slide-lead { margin-top: .75rem; font-size: .8rem; }
  .slide-illustration-panel { min-height: 520px; padding: 1rem; }
  .lesson-illustration-crop { min-height: 380px; }
  .lesson-illustration figcaption { grid-template-columns: 5rem 1fr; gap: .7rem; padding: .65rem 0; }
  .lesson-illustration figcaption span { font-size: .55rem; }
  .lesson-illustration figcaption strong { font-size: .68rem; }
  .illustration-focus { gap: .4rem; padding-top: .6rem; }
  .illustration-focus button { min-height: 36px; padding: .45rem .6rem; font-size: .6rem; }
  .lesson-illustration.is-compact { margin-top: 1rem; grid-template-rows: 250px; }
  .lesson-illustration.is-compact figcaption strong { font-size: .65rem; }
  .slide-editorial .slide-concept-experiment { min-height: 640px; padding: 1rem !important; }
  .slide-choice-panel { min-height: 640px; padding: 1rem; }
  .learner-choice-experience { grid-template-columns: 1fr; gap: .8rem; }
  .learner-choice-experience .lesson-illustration.is-compact { height: auto; grid-template-rows: 260px; }
  .learner-choice-options { gap: .65rem; }
  .learner-choice-options button { min-height: 120px; padding: .85rem; }
  .learner-choice-options button span { font-size: .58rem; }
  .learner-choice-options button strong { font-size: .76rem; }
  .slide-editorial .slide-task { grid-template-columns: 1fr; }
  .slide-editorial .slide-quick-record { padding: .9rem 1.1rem 1.1rem; border-top: 1px solid currentColor; border-left: 0; }
  .slide-editorial .slide-quick-record span { margin-bottom: .5rem; font-size: .58rem; }
  .slide-editorial .slide-quick-record textarea { min-height: 72px; padding: .65rem; font-size: .76rem; }
}

/* Concept experiments: an editorial laboratory, not a generic dashboard. */
.concept-materials {
  margin: 1.5rem 0 2.5rem;
  border-top: 5px solid var(--ink);
  background: var(--surface);
  scroll-margin-top: 10rem;
}

.concept-materials > header {
  display: grid;
  grid-template-columns: minmax(12rem, .65fr) minmax(18rem, 1.35fr);
  gap: .35rem 2rem;
  padding: 1.25rem 1.4rem 1.35rem;
  border-bottom: 1px solid var(--ink);
}

.concept-materials > header span,
.concept-experiment header > p,
.concept-experiment-controls > div > span,
.experiment-verdict > span,
.concept-experiment-result > aside > span,
.concept-experiment > footer span,
.experiment-connections span {
  font: 700 .68rem/1.3 var(--sans);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.concept-materials > header strong { font: 600 clamp(1.2rem, 2.3vw, 1.7rem)/1.35 var(--serif); }
.concept-materials > header p { grid-column: 2; margin: .15rem 0 0; color: var(--muted); line-height: 1.7; }

.concept-material-roadmap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--ink);
}

.concept-material-roadmap li { position: relative; min-height: 9.2rem; padding: 1rem 1rem 1.2rem; border-right: 1px solid var(--line); }
.concept-material-roadmap li:last-child { border-right: 0; }
.concept-material-roadmap li::after { position: absolute; right: -.42rem; top: 1.15rem; z-index: 1; content: "→"; color: var(--red); font-weight: 800; }
.concept-material-roadmap li:last-child::after { display: none; }
.concept-material-roadmap span { display: block; margin-bottom: 1rem; color: var(--red-dark); font: 700 .65rem/1 var(--mono); }
.concept-material-roadmap strong { display: block; font-size: .9rem; line-height: 1.55; }
.concept-material-roadmap small { display: block; margin-top: .65rem; color: var(--muted); font-size: .67rem; line-height: 1.45; }
.concept-material-roadmap .is-start { background: #f1eadc; }
.concept-material-roadmap .is-bridge { background: #e5ece7; }

.concept-materials > nav {
  display: flex;
  overflow-x: auto;
  border-bottom: 1px solid var(--ink);
  scrollbar-width: thin;
}

.concept-materials > nav a { display: grid; grid-template-columns: auto minmax(12rem, 1fr); gap: .8rem; align-items: start; min-width: 19rem; padding: .9rem 1rem; color: inherit; border-right: 1px solid var(--line); text-decoration: none; }
.concept-materials > nav a:hover { background: #eee7da; }
.concept-materials > nav span { color: var(--red-dark); font: 700 .65rem/1.6 var(--mono); }
.concept-materials > nav strong { font-size: .78rem; line-height: 1.45; }

.concept-material { border-bottom: 1px solid var(--ink); scroll-margin-top: 10rem; }
.concept-material > summary { display: grid; grid-template-columns: 6rem minmax(12rem, 1fr) auto; gap: 1rem; align-items: baseline; padding: 1rem 1.4rem; cursor: pointer; list-style: none; }
.concept-material > summary::-webkit-details-marker { display: none; }
.concept-material > summary span { color: var(--red-dark); font: 700 .67rem/1 var(--mono); }
.concept-material > summary strong { font: 600 1.05rem/1.45 var(--serif); }
.concept-material > summary small { color: var(--muted); font-size: .7rem; }
.concept-material[open] > summary { color: var(--white); background: var(--ink); }
.concept-material[open] > summary span { color: #f4a287; }
.concept-material[open] > summary small { color: #d4cec3; }

.concept-experiment { color: var(--ink); background: var(--surface); }
.article-toc + .concept-experiment,
.foundation-studio .concept-experiment,
[data-learning-mode-lab] > .concept-experiment,
[data-inquiry-lab] > .concept-experiment,
[data-curriculum-lab] > .concept-experiment,
[data-guidelines-lab] > .concept-experiment { margin: clamp(1.5rem, 4vw, 4rem) 0; border-top: 7px solid var(--red-dark); border-bottom: 1px solid var(--ink); }
.concept-material > .concept-experiment { border-top: 1px solid var(--line); }
.concept-materials.is-single > .concept-experiment { border-top: 0; }
.podcast-experiment { margin-top: 1.4rem; border: 1px solid var(--ink); background: var(--surface); }
.podcast-experiment > summary { display: grid; min-height: 3.5rem; padding: .9rem 1.1rem; align-items: center; color: var(--white); background: var(--ink); font-weight: 750; cursor: pointer; list-style: none; }
.podcast-experiment > summary::-webkit-details-marker { display: none; }
.podcast-experiment > summary::after { grid-area: 1 / 2; content: "+"; color: #efbd6b; font: 700 1.2rem/1 var(--mono); justify-self: end; }
.podcast-experiment[open] > summary::after { content: "−"; }
.podcast-experiment .concept-experiment { margin: 0; border: 0; }

.experiment-connections {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  border-bottom: 1px solid var(--ink);
  background: #e8ece7;
}

.experiment-connections > * { min-width: 0; }
.experiment-connections a,
.experiment-connections div { display: block; padding: .9rem 1rem; color: inherit; text-decoration: none; }
.experiment-connections a:hover { background: #dce6df; }
.experiment-connections span { display: block; margin-bottom: .35rem; color: var(--muted); font-size: .58rem; }
.experiment-connections strong { display: block; font-size: .75rem; line-height: 1.45; }
.experiment-connections i { align-self: center; color: var(--red); font-style: normal; }

.concept-experiment > header { padding: clamp(1.4rem, 3vw, 2.6rem) clamp(1.25rem, 3vw, 2.6rem); border-bottom: 1px solid var(--ink); }
.concept-experiment > header p { margin: 0 0 .9rem; color: var(--red-dark); }
.concept-experiment > header h3 { max-width: 24ch; margin: 0; font: 600 clamp(1.8rem, 4.5vw, 3.6rem)/1.15 var(--serif); letter-spacing: -.035em; }
.concept-experiment > header > strong { display: block; max-width: 48rem; margin-top: 1.2rem; font-size: clamp(.95rem, 1.6vw, 1.2rem); line-height: 1.7; }

.concept-experiment-workbench { display: grid; grid-template-columns: minmax(15rem, .72fr) minmax(0, 1.5fr); }
.concept-experiment-controls { padding: 1.4rem; border-right: 1px solid var(--ink); background: #eee9df; }
.concept-experiment-controls > div:first-child { margin-bottom: 1.25rem; padding-bottom: 1rem; border-bottom: 3px solid var(--ink); }
.concept-experiment-controls > div:first-child span { display: block; margin-bottom: .3rem; }
.concept-experiment-controls > div:first-child small { color: var(--muted); line-height: 1.6; }
.concept-experiment-control { display: block; padding: .85rem 0; border-bottom: 1px solid var(--line); }
.concept-experiment-control > span { display: block; margin-bottom: .55rem; font-weight: 700; font-size: .78rem; }
.concept-experiment-control > div { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .75rem; align-items: center; }
.concept-experiment-control input[type="range"] { width: 100%; accent-color: var(--red); }
.concept-experiment-control input[type="number"],
.concept-experiment-control input[type="text"],
.concept-experiment-control select { width: 100%; min-height: 42px; padding: .55rem .65rem; color: var(--ink); border: 1px solid var(--line-dark); border-radius: 0; background: var(--white); font: 700 .86rem/1 var(--sans); }
.concept-experiment-control output { min-width: 5rem; color: var(--red-dark); font: 700 1rem/1 var(--mono); text-align: right; }
.concept-experiment-controls > button { margin-top: 1rem; padding: .55rem .8rem; color: var(--ink); border: 1px solid var(--ink); background: transparent; font-weight: 700; cursor: pointer; }
.concept-experiment-controls > button:hover { color: var(--white); background: var(--ink); }

.concept-experiment-stepper > div { grid-template-columns: 2.75rem minmax(4rem, 1fr) 4rem; gap: .4rem; }
.concept-experiment-stepper input { position: absolute; inline-size: 1px !important; block-size: 1px; overflow: hidden; opacity: 0; }
.concept-experiment-stepper button { min-height: 46px; color: var(--white); border: 0; background: var(--ink); font: 700 1rem/1 var(--mono); cursor: pointer; }
.concept-experiment-stepper button:last-child { background: var(--red-dark); }
.concept-experiment-stepper output { display: grid; min-height: 46px; place-items: center; color: var(--ink); border: 1px solid var(--ink); background: var(--white); text-align: center; }

.concept-experiment-result { min-width: 0; }
.experiment-verdict { padding: 1.45rem clamp(1.25rem, 3vw, 2.4rem); border-bottom: 1px solid var(--line); }
.experiment-verdict span { display: block; margin-bottom: .5rem; color: var(--red-dark); }
.experiment-verdict strong { display: block; font: 600 clamp(1.25rem, 2.7vw, 2.2rem)/1.35 var(--serif); }
.experiment-verdict p { max-width: 50rem; margin: .7rem 0 0; color: var(--muted); line-height: 1.75; }
.concept-experiment-result > dl { display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); margin: 0; border-bottom: 1px solid var(--line); }
.concept-experiment-result > dl div { padding: 1rem 1.15rem; border-right: 1px solid var(--line); }
.concept-experiment-result > dl div:last-child { border-right: 0; }
.concept-experiment-result dt { color: var(--muted); font-size: .65rem; }
.concept-experiment-result dd { margin: .35rem 0 0; overflow-wrap: anywhere; font: 700 1rem/1.35 var(--mono); }
.concept-experiment-result > aside { padding: 1.1rem 1.4rem; border-top: 1px solid var(--line); background: #eef1ed; }
.concept-experiment-result > aside span { color: #3e6959; }
.concept-experiment-result > aside p { margin: .45rem 0 0; line-height: 1.75; }

.experiment-visual { min-height: 19rem; padding: clamp(1.25rem, 3vw, 2.4rem); }
.experiment-bars { display: grid; gap: .9rem; }
.experiment-bars header { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: .25rem; font-size: .72rem; }
.experiment-bars header span { font-family: var(--mono); }
.experiment-bars i { display: block; height: 1.05rem; background: #ddd7cc; }
.experiment-bars b { display: block; height: 100%; min-width: 2px; background: var(--red); transition: width .18s ease; }
.experiment-flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr)); gap: 1.35rem; align-items: stretch; margin: 0; padding: 0; list-style: none; }
.experiment-flow li { position: relative; min-height: 8rem; padding: 1rem; border: 1px solid var(--ink); background: var(--white); }
.experiment-flow li::after { position: absolute; right: -1.1rem; top: 50%; content: "→"; color: var(--red); font-weight: 800; }
.experiment-flow li:last-child::after { display: none; }
.experiment-flow li > span { display: block; width: .65rem; height: .65rem; margin-bottom: 1rem; border-radius: 50%; background: #4f816d; }
.experiment-flow li.is-warn > span { background: var(--red); }
.experiment-flow strong, .experiment-flow small { display: block; }
.experiment-flow small { margin-top: .4rem; color: var(--muted); line-height: 1.45; }
.experiment-bits > div { display: grid; grid-template-columns: repeat(8, minmax(2.1rem, 1fr)); gap: .4rem; }
.experiment-bits b { display: grid; min-height: 3.5rem; place-items: center; color: var(--white); background: var(--ink); font: 700 1.4rem/1 var(--mono); }
.experiment-bits b.is-one { background: var(--red-dark); }
.experiment-bits p { display: flex; flex-wrap: wrap; gap: .45rem; align-items: center; margin: .9rem 0 0; font-family: var(--mono); }
.experiment-bits p span { padding: .2rem .45rem; background: #eee8dc; }
.experiment-series svg { display: block; width: 100%; max-height: 14rem; overflow: visible; }
.experiment-series line { stroke: var(--line-dark); }
.experiment-series polyline { fill: none; stroke: var(--red); stroke-width: 3; }
.experiment-series circle { fill: var(--ink); }
.experiment-series > span { display: block; margin-top: .45rem; color: var(--muted); font-size: .68rem; }
.experiment-matrix { display: grid; grid-template-columns: auto 1fr; gap: .5rem; }
.experiment-matrix > div { display: grid; grid-template-columns: 1fr 1fr; }
.experiment-matrix article { min-height: 7rem; padding: 1rem; border: 1px solid var(--ink); background: #eef1ed; }
.experiment-matrix article.is-warn { background: #f2ded5; }
.experiment-matrix .axis-y { writing-mode: vertical-rl; font-size: .68rem; }
.experiment-matrix .axis-x { grid-column: 2; text-align: center; font-size: .68rem; }
.experiment-table { overflow-x: auto; }
.experiment-table table { width: 100%; border-collapse: collapse; }
.experiment-table th, .experiment-table td { padding: .65rem .75rem; border: 1px solid var(--line-dark); text-align: left; }
.experiment-table th { color: var(--white); background: var(--ink); font-size: .7rem; }
.experiment-table td { font-family: var(--mono); }

/* Network laboratories: the visual is the mechanism being inspected, not decoration. */
.experiment-packet, .experiment-network, .experiment-rsa { margin: 0; }
.experiment-packet > div { display: flex; gap: .55rem; align-items: stretch; overflow-x: auto; padding-bottom: .35rem; }
.experiment-packet article { flex: 1 0 7.2rem; min-width: 0; border: 1px solid var(--ink); background: var(--white); box-shadow: inset 0 .28rem 0 #4f816d; }
.experiment-packet article.is-warn { background: #f5e5de; box-shadow: inset 0 .28rem 0 var(--red); }
.experiment-packet article header { display: grid; gap: .22rem; padding: .65rem; border-bottom: 1px solid var(--line); }
.experiment-packet article header strong { font: 800 .78rem/1 var(--mono); }
.experiment-packet article header span { color: var(--muted); font-size: .56rem; line-height: 1.35; }
.experiment-packet article p { margin: 0; padding: .8rem .65rem; overflow-wrap: anywhere; font: 800 .8rem/1.25 var(--mono); }
.experiment-packet figcaption, .experiment-network figcaption, .experiment-rsa figcaption { margin-top: .6rem; color: var(--muted); font-size: .62rem; line-height: 1.5; }

.experiment-network .network-lane { display: flex; min-width: 0; align-items: center; justify-content: center; }
.experiment-network .network-lane article { display: grid; flex: 0 1 8.2rem; min-width: 4.8rem; min-height: 7.2rem; align-content: center; justify-items: center; gap: .35rem; padding: .65rem .4rem; border: 1px solid var(--ink); background: var(--white); text-align: center; }
.experiment-network .network-lane article > i { display: grid; width: 2.4rem; height: 2.4rem; place-items: center; color: var(--white); border-radius: 50%; background: #4f816d; font-style: normal; }
.experiment-network .network-lane article.is-warn { color: #742c25; background: #f5e5de; }
.experiment-network .network-lane article.is-warn > i { background: var(--red); }
.experiment-network .network-lane article.is-muted { color: #777; background: #e5e1d8; border-style: dashed; }
.experiment-network .network-lane article.is-muted > i { background: #a8a298; }
.experiment-network .network-lane article strong { font-size: .7rem; line-height: 1.3; }
.experiment-network .network-lane article small { color: var(--muted); font-size: .55rem; line-height: 1.3; }
.network-link { display: flex; flex: 1 1 4.2rem; min-width: 2rem; align-items: center; color: #4f816d; }
.network-link b { flex: 1; height: .16rem; background: currentColor; }
.network-link em { font: 800 1.1rem/1 var(--sans); }
.network-link.is-warn { color: var(--red); }
.network-routes { display: flex; flex-wrap: wrap; gap: .35rem; margin: .75rem 0 0; padding: 0; list-style: none; }
.network-routes li { padding: .35rem .5rem; border: 1px solid var(--line); font: 650 .55rem/1.2 var(--mono); }
.network-routes li.is-warn { color: #742c25; border-color: var(--red); background: #f5e5de; }

.experiment-rsa { padding: .2rem; }
.rsa-actors { display: grid; grid-template-columns: 1fr minmax(6rem, .6fr) 1fr; gap: .7rem; align-items: center; }
.rsa-actors article { display: grid; min-height: 8rem; align-content: center; justify-items: center; gap: .45rem; border: 1px solid var(--ink); background: var(--white); text-align: center; }
.rsa-actors article > span { display: grid; width: 2.6rem; height: 2.6rem; place-items: center; color: var(--white); border-radius: 50%; background: var(--ink); font: 800 1.1rem/1 var(--serif); }
.rsa-actors article strong { font-family: var(--serif); }
.rsa-actors article small { color: var(--muted); font-size: .6rem; }
.rsa-actors > i { display: grid; gap: .5rem; color: var(--red-dark); text-align: center; font-style: normal; }
.rsa-actors > i b, .rsa-actors > i small { font: 800 .6rem/1.2 var(--mono); }
.rsa-actors > i em { font: 800 1.5rem/1 var(--sans); }
.rsa-equation { display: flex; align-items: center; justify-content: center; gap: .8rem; padding: 1rem; border: 1px solid var(--ink); background: var(--white); font: 750 1rem/1 var(--mono); }
.rsa-equation strong { color: var(--red-dark); font-size: 1.25rem; }
.rsa-keycards { display: grid; grid-template-columns: 1fr 1fr; margin-top: .7rem; border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.rsa-keycards article { display: grid; gap: .4rem; padding: 1rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: #eef1ed; }
.rsa-keycards article:last-child { background: #eee9df; }
.rsa-keycards span { color: var(--muted); font: 700 .55rem/1 var(--mono); }
.rsa-keycards strong { font: 800 .8rem/1.3 var(--mono); }
.experiment-rsa.is-invalid .rsa-equation, .experiment-rsa.is-invalid .rsa-keycards article:last-child { background: #f5e5de; }
.experiment-rsa.is-process > div { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: .5rem; align-items: center; }
.experiment-rsa.is-process article { display: grid; min-height: 8rem; align-content: center; gap: .4rem; padding: .75rem; color: #8d877e; border: 1px dashed #aaa398; background: #e8e3d9; }
.experiment-rsa.is-process article.is-active { color: var(--ink); border: 1px solid var(--ink); background: var(--white); box-shadow: inset 0 .3rem 0 #4f816d; }
.experiment-rsa.is-process.is-invalid article.is-active:last-of-type { box-shadow: inset 0 .3rem 0 var(--red); }
.experiment-rsa.is-process article span { color: var(--red-dark); font: 800 .56rem/1 var(--mono); }
.experiment-rsa.is-process article strong { font-size: .68rem; line-height: 1.4; }
.experiment-rsa.is-process article b { overflow-wrap: anywhere; font: 800 1rem/1.2 var(--mono); }
.experiment-rsa.is-process > div > i { color: var(--red); font: 800 1.2rem/1 var(--sans); }

.concept-experiment > footer { display: grid; grid-template-columns: .72fr 1.4fr .8fr; border-top: 1px solid var(--ink); }
.concept-experiment > footer > * { padding: 1.2rem 1.35rem; border-right: 1px solid var(--line); }
.concept-experiment > footer > *:last-child { border-right: 0; }
.concept-experiment > footer > div span,
.concept-experiment > footer > label span,
.concept-experiment > footer > aside span { display: block; margin-bottom: .55rem; color: var(--red-dark); }
.concept-experiment > footer > div strong,
.concept-experiment > footer > aside p { font-size: .8rem; line-height: 1.65; }
.concept-experiment > footer textarea { width: 100%; padding: .75rem; border: 1px solid var(--line-dark); border-radius: 0; background: var(--white); font: .82rem/1.7 var(--sans); resize: vertical; }
.concept-experiment > footer aside { background: #eee9df; }
.concept-experiment > footer aside p { margin: 0; }

/* The same calculation lives inside an HTML lesson slide, with a tighter composition. */
.slide-concept-experiment { overflow: hidden; padding: 0 !important; }
.slide-concept-experiment .concept-experiment { width: 100%; height: 100%; border: 0; background: #f7f3ea; }
.slide-concept-experiment .concept-experiment-workbench { display: grid; grid-template-columns: 1fr; grid-template-rows: auto 1fr; height: 100%; }
.slide-concept-experiment .concept-experiment-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .45rem .7rem; padding: .65rem .75rem; border: 0; border-bottom: 1px solid currentColor; }
.slide-concept-experiment .concept-experiment-controls > div:first-child { grid-column: 1 / -1; margin: 0; padding: 0 0 .35rem; border: 0; }
.slide-concept-experiment .concept-experiment-controls > div:first-child span { margin-bottom: .1rem; font-size: .58rem; }
.slide-concept-experiment .concept-experiment-controls > div:first-child small { display: -webkit-box; overflow: hidden; font-size: .63rem; line-height: 1.35; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.slide-concept-experiment .concept-experiment-control { min-width: 0; padding: 0; border: 0; }
.slide-concept-experiment .concept-experiment-control > span { margin-bottom: .2rem; overflow: hidden; font-size: .57rem; text-overflow: ellipsis; white-space: nowrap; }
.slide-concept-experiment .concept-experiment-control input[type="number"],
.slide-concept-experiment .concept-experiment-control input[type="text"],
.slide-concept-experiment .concept-experiment-control select { min-height: 2rem; padding: .3rem .45rem; font-size: .68rem; }
.slide-concept-experiment .concept-experiment-control output { min-width: 3.5rem; font-size: .68rem; }
.slide-concept-experiment .concept-experiment-stepper > div { grid-template-columns: 2rem minmax(3.5rem, 1fr) 3rem; }
.slide-concept-experiment .concept-experiment-stepper button,
.slide-concept-experiment .concept-experiment-stepper output { min-height: 2rem; font-size: .7rem; }
.slide-concept-experiment .concept-experiment-result { display: grid; grid-template-rows: auto 1fr; min-height: 0; }
.slide-concept-experiment .experiment-verdict { padding: .6rem .75rem; }
.slide-concept-experiment .experiment-verdict span { margin-bottom: .15rem; font-size: .55rem; }
.slide-concept-experiment .experiment-verdict strong { font-size: .92rem; line-height: 1.25; }
.slide-concept-experiment .experiment-verdict p,
.slide-concept-experiment .concept-experiment-result > dl,
.slide-concept-experiment .concept-experiment-result > aside { display: none; }
.slide-concept-experiment .experiment-visual { display: grid; min-height: 0; padding: .7rem .75rem; overflow: hidden; align-content: center; }
.slide-concept-experiment .experiment-bars { gap: .45rem; }
.slide-concept-experiment .experiment-bars header { margin-bottom: .1rem; font-size: .6rem; }
.slide-concept-experiment .experiment-bars i { height: .72rem; }
.slide-concept-experiment .experiment-flow { gap: .35rem; }
.slide-concept-experiment .experiment-flow li { min-height: 4rem; padding: .45rem; }
.slide-concept-experiment .experiment-flow li::after { display: none; }
.slide-concept-experiment .experiment-flow li > span { width: .35rem; height: .35rem; margin-bottom: .35rem; }
.slide-concept-experiment .experiment-flow strong { font-size: .58rem; }
.slide-concept-experiment .experiment-flow small { margin-top: .12rem; font-size: .5rem; }
.slide-concept-experiment .experiment-bits > div { gap: .2rem; }
.slide-concept-experiment .experiment-bits b { min-height: 3rem; font-size: 1.05rem; }
.slide-concept-experiment .experiment-bits p { margin-top: .45rem; font-size: .6rem; }
.slide-concept-experiment .experiment-series svg { max-height: 9.5rem; }
.slide-concept-experiment .experiment-table th,
.slide-concept-experiment .experiment-table td { padding: .28rem .35rem; font-size: .55rem; }
.slide-concept-experiment .experiment-matrix article { min-height: 3.5rem; padding: .45rem; }
.slide-concept-experiment .experiment-packet article { flex-basis: 5.4rem; }
.slide-concept-experiment .experiment-packet article header { padding: .35rem; }
.slide-concept-experiment .experiment-packet article header strong { font-size: .56rem; }
.slide-concept-experiment .experiment-packet article header span { font-size: .44rem; }
.slide-concept-experiment .experiment-packet article p { padding: .42rem .35rem; font-size: .58rem; }
.slide-concept-experiment .experiment-packet figcaption,
.slide-concept-experiment .experiment-network figcaption,
.slide-concept-experiment .experiment-rsa figcaption { margin-top: .3rem; font-size: .48rem; }
.slide-concept-experiment .experiment-network .network-lane article { min-width: 3.7rem; min-height: 4.8rem; padding: .35rem .25rem; }
.slide-concept-experiment .experiment-network .network-lane article > i { width: 1.55rem; height: 1.55rem; font-size: .55rem; }
.slide-concept-experiment .experiment-network .network-lane article strong { font-size: .5rem; }
.slide-concept-experiment .experiment-network .network-lane article small { font-size: .42rem; }
.slide-concept-experiment .network-link { min-width: 1.1rem; }
.slide-concept-experiment .network-routes { margin-top: .3rem; }
.slide-concept-experiment .network-routes li { padding: .2rem .3rem; font-size: .42rem; }
.slide-concept-experiment .rsa-actors article { min-height: 5rem; }
.slide-concept-experiment .rsa-actors article > span { width: 1.6rem; height: 1.6rem; font-size: .68rem; }
.slide-concept-experiment .rsa-actors article strong { font-size: .6rem; }
.slide-concept-experiment .rsa-actors article small,
.slide-concept-experiment .rsa-actors > i b,
.slide-concept-experiment .rsa-actors > i small { font-size: .43rem; }
.slide-concept-experiment .rsa-equation { padding: .55rem; font-size: .68rem; }
.slide-concept-experiment .rsa-keycards article { padding: .55rem; }
.slide-concept-experiment .rsa-keycards strong { font-size: .58rem; }
.slide-concept-experiment .experiment-rsa.is-process article { min-height: 5rem; padding: .4rem; }
.slide-concept-experiment .experiment-rsa.is-process article span { font-size: .44rem; }
.slide-concept-experiment .experiment-rsa.is-process article strong { font-size: .5rem; }
.slide-concept-experiment .experiment-rsa.is-process article b { font-size: .65rem; }

.positional-stage {
  display: grid;
  min-height: 100%;
  grid-template-rows: auto minmax(0, 1fr) auto auto auto auto;
  padding: .7rem .8rem;
  background: #f8f4ea;
}
.positional-stage > header { display: flex; align-items: baseline; justify-content: space-between; gap: .7rem; padding-bottom: .45rem; border-bottom: 1px solid var(--ink); }
.positional-stage > header span { color: var(--red-dark); font: 700 .58rem/1 var(--mono); letter-spacing: .08em; }
.positional-stage > header strong { font: 700 .72rem/1.25 var(--serif); }
.positional-places { display: grid; min-height: 0; align-items: stretch; grid-template-columns: repeat(var(--place-count), minmax(0, 1fr)); border-left: 1px solid var(--ink); }
.positional-place { position: relative; display: grid; min-width: 0; align-content: center; gap: .2rem; padding: .35rem .22rem; color: var(--ink); border: 0; border-right: 1px solid var(--ink); background: transparent; cursor: pointer; }
.positional-place:hover, .positional-place:focus-visible { background: #fff; outline: .2rem solid #d9a23c; outline-offset: -.2rem; }
.positional-place b { font: 800 clamp(1.2rem, 2.8cqw, 2.25rem)/1 var(--mono); }
.positional-place span, .positional-place small { color: var(--muted); font: 600 .52rem/1.2 var(--mono); }
.positional-place em { color: var(--red-dark); font: 800 .68rem/1 var(--mono); }
.positional-place.is-changed { box-shadow: inset 0 -.28rem 0 #d9a23c; }
.positional-place.is-carry-source::after { position: absolute; top: .25rem; right: .25rem; width: .42rem; height: .42rem; border-radius: 50%; background: var(--red); content: ""; }
.positional-place.is-carry-target { background: #e5eee9; }
.positional-equation { display: flex; min-width: 0; align-items: center; justify-content: center; gap: .45rem; padding: .48rem .35rem; overflow: hidden; border-top: 1px solid var(--ink); font: 700 .64rem/1.25 var(--mono); white-space: nowrap; }
.positional-equation strong { color: var(--red-dark); font-size: .85rem; }
.positional-equation sub, .positional-equivalents sub { margin-left: .08rem; font-size: .52em; }
.positional-carry { display: grid; grid-template-columns: 5rem 1fr; gap: .6rem; padding: .38rem .5rem; color: var(--muted); border-top: 1px solid var(--line); font-size: .56rem; line-height: 1.35; }
.positional-carry span { font: 700 .5rem/1.35 var(--mono); }
.positional-carry.is-active { color: #742c25; background: #f4e4dd; }
.positional-equivalents { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.positional-equivalents div { display: grid; min-width: 0; gap: .16rem; padding: .38rem .28rem; border-right: 1px solid var(--ink); text-align: center; }
.positional-equivalents span { color: var(--muted); font: 700 .46rem/1 var(--mono); }
.positional-equivalents strong { overflow: hidden; font: 800 .68rem/1.1 var(--mono); text-overflow: ellipsis; }
.positional-equivalents .is-current { color: var(--paper); background: var(--ink); }
.positional-equivalents .is-current span { color: #efbd6b; }
.positional-stage > p { margin: 0; padding-top: .36rem; color: var(--muted); font-size: .5rem; line-height: 1.3; }
.slide-concept-experiment .concept-experiment.is-positional .concept-experiment-workbench { grid-template-rows: auto minmax(0, 1fr); }
.slide-concept-experiment .concept-experiment.is-positional [data-experiment-result] { min-height: 0; overflow: hidden; }

@media (max-width: 880px) {
  .concept-materials > header { grid-template-columns: 1fr; }
  .concept-materials > header p { grid-column: 1; }
  .concept-experiment-workbench { grid-template-columns: 1fr; }
  .concept-experiment-controls { border-right: 0; border-bottom: 1px solid var(--ink); }
  .experiment-connections { grid-template-columns: 1fr; }
  .experiment-connections i { display: none; }
  .experiment-connections > * { border-bottom: 1px solid var(--line); }
  .concept-experiment > footer { grid-template-columns: 1fr; }
  .concept-experiment > footer > * { border-right: 0; border-bottom: 1px solid var(--line); }
}

@media (max-width: 620px) {
  .concept-material-roadmap { grid-template-columns: 1fr; }
  .concept-material-roadmap li { min-height: 0; padding: .8rem 1rem; border-right: 0; border-bottom: 1px solid var(--line); }
  .concept-material-roadmap li::after { right: 1rem; top: auto; bottom: -.55rem; content: "↓"; }
  .concept-material-roadmap span { margin-bottom: .45rem; }
  .concept-material > summary { grid-template-columns: 1fr; gap: .35rem; }
  .concept-material > summary small { display: none; }
  .concept-experiment > header h3 { font-size: 1.7rem; }
  .experiment-visual { min-height: 15rem; padding: 1rem; }
  .experiment-flow { grid-template-columns: 1fr; }
  .experiment-flow li { min-height: 0; }
  .experiment-flow li::after { right: auto; left: 1rem; top: auto; bottom: -1.25rem; content: "↓"; }
  .experiment-bits > div { grid-template-columns: repeat(4, 1fr); }
}

/* Teacher access — deliberately quiet, closer to a small editorial archive than a dashboard. */
.teacher-section { padding: 68px 0 120px; }
.teacher-login-shell { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(360px, 0.7fr); gap: 11vw; align-items: start; }
.teacher-login-shell > aside { padding: 10px 0 40px 38px; border-left: 8px solid var(--red); }
.teacher-login-shell h2, .teacher-library h2 { margin: 13px 0 18px; font-family: var(--serif); font-size: clamp(1.7rem, 3vw, 2.8rem); font-weight: 600; line-height: 1.35; }
.teacher-login-shell aside > p:not(.eyebrow), .teacher-library-head p { max-width: 620px; color: var(--muted); font-size: 0.75rem; line-height: 1.9; }
.teacher-login-form { display: grid; gap: 22px; padding: 34px; border-top: 5px solid var(--ink); background: #ebe7dc; box-shadow: 18px 18px 0 rgba(37, 35, 31, 0.07); }
.teacher-login-form h2 { margin: 9px 0 0; font-size: 1.75rem; }
.teacher-login-form .button { justify-self: start; min-width: 150px; }
.form-status { min-height: 1.5em; margin: -4px 0; color: var(--red-dark); font-size: 0.7rem; line-height: 1.6; }
.teacher-library-head { display: flex; justify-content: space-between; gap: 42px; align-items: flex-end; padding-bottom: 34px; border-bottom: 1px solid var(--ink); }
.teacher-library-actions, .teacher-deck-actions { display: flex; gap: 9px; flex-wrap: wrap; }
.teacher-deck-list { border-bottom: 1px solid var(--ink); }
.teacher-deck-row { display: grid; grid-template-columns: 55px minmax(0, 1fr) auto; gap: 24px; align-items: center; padding: 24px 0; border-bottom: 1px solid var(--line); }
.teacher-deck-row:last-child { border-bottom: 0; }
.teacher-deck-index { color: var(--red-dark); font-family: var(--serif); font-size: 1.45rem; }
.teacher-deck-row p, .teacher-deck-row h3, .teacher-deck-row small { margin: 0; }
.teacher-deck-row > div:nth-child(2) > p { color: var(--muted); font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.06em; }
.teacher-deck-row h3 { margin: 5px 0; font-family: var(--serif); font-size: 1.05rem; font-weight: 600; }
.teacher-deck-row small { color: var(--muted); font-size: 0.63rem; line-height: 1.6; }
.teacher-row-status { grid-column: 2 / -1; min-height: 0; color: var(--red-dark); font-size: 0.65rem; }
.teacher-row-status:empty { display: none; }
.teacher-cycle { display: grid; margin: 2.8rem 0; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.teacher-cycle article { min-height: 10rem; padding: 1.2rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.teacher-cycle span { color: var(--red-dark); font: 700 .6rem/1.4 var(--mono); }
.teacher-cycle h3 { margin: 1.4rem 0 .55rem; font-family: var(--serif); font-size: 1.25rem; }
.teacher-cycle p { margin: 0; color: var(--muted); font-size: .72rem; line-height: 1.75; }
.teacher-toolbar { display: grid; margin: 3rem 0 0; grid-template-columns: minmax(18rem, 1fr) auto; gap: 1rem; align-items: end; padding: 1.1rem; color: var(--paper); background: var(--ink); }
.teacher-toolbar > label { display: grid; gap: .4rem; }
.teacher-toolbar > label span { color: #efbd6b; font: 700 .58rem/1.4 var(--mono); }
.teacher-toolbar input { min-height: 44px; padding: .7rem; color: var(--paper); background: #202936; border: 1px solid #6f7986; border-radius: 0; font: inherit; }
.teacher-toolbar input::placeholder { color: #aab2bc; }
.teacher-toolbar > div { display: flex; }
.teacher-toolbar > div button { min-height: 44px; padding: .65rem .85rem; color: #d5dae0; background: transparent; border: 1px solid #6f7986; border-right: 0; border-radius: 0; font-size: .69rem; font-weight: 750; cursor: pointer; }
.teacher-toolbar > div button:last-child { border-right: 1px solid #6f7986; }
.teacher-toolbar > div button[aria-pressed="true"] { color: var(--ink); background: #efbd6b; border-color: #efbd6b; }
.teacher-result-count { margin: .85rem 0; color: var(--muted); font: .62rem/1.5 var(--mono); }
.teacher-deck-copy > strong { display: block; margin-top: .55rem; color: var(--ink); font-family: var(--serif); font-size: .82rem; font-weight: 500; line-height: 1.55; }
.teacher-empty { padding: 4rem 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); text-align: center; }
.teacher-empty strong { font-family: var(--serif); font-size: 1.25rem; }
.teacher-empty p { color: var(--muted); font-size: .72rem; }

.teacher-planner { width: min(94vw, 1120px); max-height: 92dvh; padding: 0; color: var(--ink); background: var(--paper); border: 1px solid var(--ink); box-shadow: 0 30px 80px rgba(20, 24, 31, .36); }
.teacher-planner::backdrop { background: rgba(18, 22, 28, .72); }
.teacher-planner > header { position: sticky; z-index: 3; top: 0; display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding: 1rem 1.3rem; color: var(--paper); background: #10151c; border-bottom: 1px solid #626b76; }
.teacher-planner > header p { margin: 0 0 .25rem; color: #efbd6b; font: 700 .58rem/1.3 var(--mono); }
.teacher-planner > header h2 { margin: 0; font-family: var(--serif); font-size: 1.1rem; font-weight: 500; }
.teacher-planner > header button { display: grid; width: 42px; height: 42px; place-items: center; color: var(--paper); background: transparent; border: 1px solid #6f7986; border-radius: 0; font-size: 1.3rem; cursor: pointer; }
.teacher-planner > nav { position: sticky; z-index: 2; top: 75px; display: grid; grid-template-columns: repeat(3, 1fr); background: #ddd7cb; border-bottom: 1px solid var(--ink); }
.teacher-planner > nav button { min-height: 52px; color: inherit; background: transparent; border: 0; border-right: 1px solid var(--ink); border-radius: 0; font-weight: 800; cursor: pointer; }
.teacher-planner > nav button[aria-pressed="true"] { color: var(--paper); background: var(--ink); box-shadow: inset 0 5px 0 #efbd6b; }
.teacher-planner-body { min-height: 34rem; padding: clamp(1.5rem, 4vw, 3.5rem); }
.planner-lead { padding-bottom: 2rem; border-bottom: 1px solid var(--ink); }
.planner-lead > span { color: var(--red-dark); font: 700 .61rem/1.4 var(--mono); }
.planner-lead h3 { max-width: 25ch; margin: .75rem 0; font-family: var(--serif); font-size: clamp(1.8rem, 3.5vw, 3.25rem); font-weight: 500; line-height: 1.35; }
.planner-lead p { max-width: 48rem; color: var(--muted); font-size: .78rem; line-height: 1.85; }
.planner-before-grid { display: grid; margin-top: 2rem; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.planner-before-grid > section { padding: 1.2rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.planner-before-grid h4 { margin: 0 0 1rem; font-family: var(--serif); font-size: 1.05rem; }
.planner-before-grid dl, .planner-before-grid ol { margin: 0; padding: 0; list-style: none; }
.planner-before-grid dl > div { padding: .8rem 0; border-top: 1px solid var(--line); }
.planner-before-grid dt { color: var(--red-dark); font: 700 .58rem/1.4 var(--mono); }
.planner-before-grid dd { margin: .35rem 0 0; font-size: .72rem; line-height: 1.75; }
.planner-before-grid li { display: grid; grid-template-columns: 3.5rem 1fr; gap: .7rem; padding: .8rem 0; border-top: 1px solid var(--line); }
.planner-before-grid li > span { color: var(--red-dark); font: 700 .61rem/1.4 var(--mono); }
.planner-before-grid li b { font-family: var(--serif); }
.planner-before-grid li p { margin: .3rem 0 0; font-size: .7rem; line-height: 1.65; }
.prep-check { display: grid; margin: 1.5rem 0 0; padding: 1.1rem; gap: .7rem; border: 1px solid var(--ink); }
.prep-check legend { padding: 0 .45rem; color: var(--red-dark); font: 700 .61rem/1.4 var(--mono); }
.prep-check label { display: flex; gap: .65rem; align-items: center; font-size: .74rem; }
.prep-check input { width: 1.2rem; height: 1.2rem; accent-color: var(--green); }
.decision-ledger { margin-top: 2rem; border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.decision-ledger-head, .decision-ledger article { display: grid; grid-template-columns: .8fr 1.2fr 1.3fr; }
.decision-ledger-head { color: var(--paper); background: var(--ink); }
.decision-ledger-head span { padding: .7rem; border-right: 1px solid #68727f; font: 700 .58rem/1.4 var(--mono); }
.decision-ledger article > * { min-width: 0; padding: 1rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.decision-ledger article > div { display: grid; align-content: start; gap: .35rem; }
.decision-ledger article span { color: var(--red-dark); font: 700 .58rem/1.4 var(--mono); }
.decision-ledger article strong, .decision-ledger article b { font-family: var(--serif); font-size: .82rem; line-height: 1.55; }
.decision-ledger article p, .decision-ledger article small { margin: 0; color: var(--muted); font-size: .68rem; line-height: 1.65; }
.teacher-listen { display: grid; margin-top: 1.5rem; padding: 1rem 0; grid-template-columns: 10rem 1fr; border-top: 6px solid #efbd6b; border-bottom: 1px solid var(--ink); }
.teacher-listen span { color: var(--red-dark); font: 700 .6rem/1.4 var(--mono); }
.teacher-listen p { margin: 0; font-family: var(--serif); line-height: 1.7; }
.after-prompts { display: grid; margin-top: 2rem; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.after-prompts article { min-height: 11rem; padding: 1rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.after-prompts span { color: var(--red-dark); font: 700 .6rem/1 var(--mono); }
.after-prompts strong { display: block; margin: 1.7rem 0 .6rem; font-family: var(--serif); }
.after-prompts p { margin: 0; color: var(--muted); font-size: .69rem; line-height: 1.7; }
.teacher-note { display: grid; gap: .6rem; margin-top: 1.5rem; }
.teacher-note > span { color: var(--red-dark); font: 700 .61rem/1.4 var(--mono); }
.teacher-note textarea { width: 100%; padding: 1rem; color: inherit; background: #eee8dc; border: 1px solid var(--ink); border-radius: 0; font: inherit; line-height: 1.8; resize: vertical; }
.teacher-planner > footer { position: sticky; z-index: 2; bottom: 0; display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding: .85rem 1.2rem; color: var(--paper); background: #10151c; border-top: 1px solid #626b76; }
.teacher-planner > footer p { margin: 0; color: #cfd4da; font-size: .64rem; }
.teacher-planner > footer div { display: flex; gap: .45rem; }
.teacher-planner > footer button, .teacher-planner > footer a { display: inline-flex; min-height: 40px; padding: .55rem .75rem; align-items: center; color: var(--paper); background: transparent; border: 1px solid #6f7986; border-radius: 0; text-decoration: none; font-size: .67rem; font-weight: 800; cursor: pointer; }
.teacher-planner > footer [data-planner-download] { color: var(--ink); background: #efbd6b; border-color: #efbd6b; }

@media (max-width: 800px) {
  .teacher-login-shell { grid-template-columns: 1fr; gap: 45px; }
  .teacher-library-head { display: grid; align-items: start; }
  .teacher-deck-row { grid-template-columns: 40px minmax(0, 1fr); }
  .teacher-deck-actions { grid-column: 2; }
  .teacher-row-status { grid-column: 2; }
  .teacher-cycle, .planner-before-grid, .after-prompts { grid-template-columns: 1fr; }
  .teacher-toolbar { grid-template-columns: 1fr; }
  .teacher-toolbar > div { overflow-x: auto; }
  .teacher-planner { width: 100vw; height: 100dvh; max-height: none; border: 0; }
  .decision-ledger-head { display: none; }
  .decision-ledger article { grid-template-columns: 1fr; }
  .teacher-listen { grid-template-columns: 1fr; gap: .5rem; }
  .teacher-planner > footer { align-items: stretch; flex-direction: column; }
  .teacher-planner > footer div { overflow-x: auto; }
}

@media (max-width: 520px) {
  .teacher-section { padding: 42px 0 85px; }
  .teacher-login-form { padding: 26px 22px; }
  .teacher-login-shell > aside { padding-left: 24px; }
}

@media print {
  body:has(.teacher-planner[open]) > *:not(.teacher-planner) { display: none !important; }
  .teacher-planner[open] { position: static; display: block; width: 100%; max-height: none; border: 0; box-shadow: none; }
  .teacher-planner > header, .teacher-planner > nav, .teacher-planner > footer { position: static; color: #111; background: #fff; }
  .teacher-planner > header button, .teacher-planner > footer { display: none; }
}

/* Admin publishing */
.admin-hero h1 { font-size: clamp(3.2rem, 6.1vw, 6.8rem); }
.admin-section { padding: 66px 0 120px; }
.admin-layout { display: grid; align-items: start; grid-template-columns: 280px minmax(0, 1fr); gap: 72px; }
.admin-guide { position: sticky; top: 126px; padding-top: 20px; border-top: 1px solid var(--ink); }
.admin-guide h2 { margin: 14px 0 26px; font-family: var(--serif); font-size: 1.55rem; font-weight: 600; line-height: 1.55; }
.admin-guide ol { margin: 0; padding: 0; list-style: none; counter-reset: publish; border-top: 1px solid var(--line); }
.admin-guide li { display: grid; grid-template-columns: 30px 1fr; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 0.72rem; counter-increment: publish; }
.admin-guide li::before { color: var(--red-dark); font-family: var(--mono); font-size: 0.6rem; content: "0" counter(publish); }
.admin-guide > p:last-child { margin-top: 25px; color: var(--muted); font-size: 0.67rem; line-height: 1.9; }
.admin-form { min-width: 0; }
.admin-form fieldset { margin: 0 0 54px; padding: 0; border: 0; }
.admin-form legend { width: 100%; margin-bottom: 23px; padding: 0 0 12px; border-bottom: 1px solid var(--ink); font-family: var(--serif); font-size: 1.15rem; font-weight: 600; }
.admin-form legend span { margin-right: 18px; color: var(--red-dark); font-family: var(--mono); font-size: 0.64rem; }
.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 21px 26px; }
.field, .check-field { display: grid; align-content: start; gap: 8px; }
.field-wide { grid-column: 1 / -1; }
.field > span { color: var(--muted); font-size: 0.65rem; font-weight: 600; }
.field input, .field textarea, .field select { width: 100%; min-height: 44px; padding: 10px 12px; color: var(--ink); border: 1px solid var(--line-dark); border-radius: 0; background: rgba(255, 255, 255, 0.28); font: inherit; font-size: 0.75rem; }
.field textarea { resize: vertical; line-height: 1.75; }
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--red-dark); outline: 2px solid rgba(157, 56, 39, 0.12); }
.field small { color: var(--muted); font-size: 0.58rem; line-height: 1.6; }
.story-form-grid, .support-form-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.story-form-grid > div, .support-form-grid > div { display: grid; align-content: start; gap: 15px; padding: 19px 16px 22px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.story-form-grid > div:first-child, .support-form-grid > div:first-child { border-left: 1px solid var(--line); }
.support-form-grid { margin-top: 27px; }
.upload-field { min-height: 142px; padding: 19px; border: 1px solid var(--line-dark); background: rgba(255, 255, 255, 0.22); }
.upload-field input { padding: 7px 0; border: 0; background: transparent; }
.check-field { display: flex; align-items: flex-start; grid-template-columns: none; gap: 11px; color: var(--muted); font-size: 0.67rem; line-height: 1.7; }
.check-field input { width: 17px; height: 17px; margin-top: 2px; accent-color: var(--red-dark); }
.publish-bar { position: sticky; z-index: 20; bottom: 0; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 17px 19px; color: var(--paper); border-top: 1px solid #555149; background: var(--ink); box-shadow: 0 -12px 25px rgba(29, 28, 25, 0.12); }
.publish-bar p { margin: 0; font-size: 0.66rem; line-height: 1.7; }
.publish-bar p a { color: #f1ad90; }
.publish-bar .is-error { color: #ffb0a2; }
.publish-bar .is-success { color: #bcd6b9; }
.publish-bar .is-working { color: #ead3a4; }
.publish-bar button:disabled { opacity: 0.45; cursor: wait; }

@media (max-width: 1050px) {
  .admin-layout { grid-template-columns: 220px minmax(0, 1fr); gap: 38px; }
  .story-form-grid, .support-form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .story-form-grid > div:nth-child(3), .support-form-grid > div:nth-child(3) { border-left: 1px solid var(--line); }
}

@media (max-width: 840px) {
  .admin-layout { display: block; }
  .admin-guide { position: static; margin-bottom: 54px; }
}

@media (max-width: 600px) {
  .admin-section { padding: 42px 0 90px; }
  .field-grid, .story-form-grid, .support-form-grid { grid-template-columns: 1fr; }
  .field-wide { grid-column: auto; }
  .story-form-grid > div, .story-form-grid > div:nth-child(3), .support-form-grid > div, .support-form-grid > div:nth-child(3) { border-left: 1px solid var(--line); }
  .publish-bar { align-items: stretch; flex-direction: column; }
  .publish-bar .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media print {
  body {
    background: #fff;
  }

  .site-header,
  main,
  .site-footer,
  .sheet-dialog-head,
  .dialog::backdrop {
    display: none !important;
  }

  .sheet-dialog[open] {
    position: static;
    display: block;
    width: auto;
    height: auto;
    max-height: none;
    border: 0;
    box-shadow: none;
  }

  .worksheet-wrap {
    height: auto;
    padding: 0;
    overflow: visible;
    background: #fff;
  }

  .worksheet {
    width: 210mm;
    min-height: 297mm;
    margin: 0;
    padding: 14mm 16mm;
    box-shadow: none;
  }
}

/* Narrative lesson player */
.deck-question {
  margin: 19px 0 0 !important;
  padding: 15px 0 0;
  color: var(--ink) !important;
  border-top: 1px solid var(--line);
  font-family: var(--serif);
  font-size: 0.82rem !important;
  font-weight: 600;
  line-height: 1.75 !important;
}

.story-line {
  display: grid;
  margin-top: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.story-line span {
  min-width: 0;
  padding: 9px 7px 0;
  color: var(--muted);
  border-right: 1px solid var(--line);
  font-size: 0.56rem;
  line-height: 1.55;
}

.story-line span:first-child { padding-left: 0; }
.story-line span:last-child { padding-right: 0; border-right: 0; }
.story-line b { display: block; margin-bottom: 4px; color: var(--red-dark); font-family: var(--mono); font-size: 0.55rem; font-weight: 600; }
.curriculum-alignment { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 15px 0 0 !important; color: var(--ink) !important; font-size: 0.6rem !important; line-height: 1.5 !important; }
.curriculum-alignment b { margin-right: 3px; color: var(--red-dark); font-family: var(--mono); font-size: 0.52rem; letter-spacing: 0.07em; }
.curriculum-alignment span { padding: 3px 6px; border: 1px solid var(--line-dark); }

.slide-workspace {
  display: grid;
  min-height: 0;
  grid-template-columns: minmax(0, 1fr) auto;
}

.player-panel {
  width: min(34vw, 420px);
  padding: 29px 28px 48px;
  overflow: auto;
  color: var(--ink);
  border-left: 1px solid #47443f;
  background: var(--paper);
}

.player-panel[hidden] { display: none; }
.panel-kicker { margin: 0 0 15px; color: var(--red-dark); font-family: var(--mono); font-size: 0.61rem; letter-spacing: 0.1em; }
.player-panel h2 { margin: 0; font-family: var(--serif); font-size: 1.35rem; font-weight: 600; line-height: 1.45; }
.panel-role, .panel-intro { color: var(--muted); font-size: 0.7rem; line-height: 1.75; }
.player-panel dl { margin: 25px 0 0; }
.panel-row { padding: 14px 0; border-top: 1px solid var(--line); }
.panel-row dt { margin-bottom: 6px; color: var(--red-dark); font-family: var(--mono); font-size: 0.57rem; }
.panel-row dd { margin: 0; font-size: 0.69rem; line-height: 1.75; }
.panel-story { display: grid; margin-top: 24px; border-top: 1px solid var(--ink); }
.panel-story > div { display: grid; grid-template-columns: 76px 1fr; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.panel-story b { color: var(--red-dark); font-family: var(--serif); font-size: 0.78rem; }
.panel-story span { color: var(--muted); font-size: 0.68rem; line-height: 1.65; }
.support-list { margin-top: 25px; border-top: 1px solid var(--ink); }
.support-list details { border-bottom: 1px solid var(--line); }
.support-list summary { display: grid; grid-template-columns: 34px 1fr; align-items: center; padding: 15px 0; cursor: pointer; }
.support-list summary span { color: var(--red-dark); font-family: var(--mono); font-size: 0.63rem; }
.support-list summary b { font-family: var(--serif); font-size: 0.84rem; font-weight: 600; }
.support-list details p { margin: 0 0 14px 34px; font-size: 0.7rem; line-height: 1.75; }
.support-list .support-diagnosis { margin-bottom: 5px; color: var(--muted); font-size: 0.61rem; }

.slide-prompt span {
  display: block;
  margin-bottom: 4px;
  color: var(--red-dark);
  font-family: var(--mono);
  font-size: 0.52rem;
  letter-spacing: 0.11em;
}

.slide[data-kind="gate"]::after { width: 28px; background: var(--red-dark); }
.slide[data-kind="opening"] { color: var(--paper); background: var(--ink); }
.slide[data-kind="opening"]::after { width: 28px; background: var(--red); }
.slide[data-kind="opening"] .slide-lead { color: #c7c0b5; }
.slide[data-kind="opening"] .slide-items { border-top-color: #716b62; }
.slide[data-kind="opening"] .slide-item { border-right-color: #716b62; }
.slide[data-kind="opening"] .slide-prompt { border-top-color: #716b62; }
.slide[data-kind="reveal"]::after { width: 28px; background: var(--green); }
.slide[data-kind="checkpoint"]::after { width: 28px; background: var(--gold); }
.slide[data-kind="revision"]::after { width: 28px; background: var(--blue); }
.slide[data-kind="summary"] { background: #e7e1d6; }
.slide[data-kind="summary"]::after { width: 28px; background: var(--ink); }
.slide[data-kind="transfer"] { background: #ebe7dd; }
.slide[data-kind="reconsider"] .slide-content::before { display: block; width: 46px; margin-bottom: 18px; border-top: 4px solid var(--red); content: ""; }
.slide-frame.is-document { height: 100%; aspect-ratio: auto; background: #24231f; }
.document-player { display: grid; height: 100%; grid-template-rows: 1fr auto; }
.document-player iframe { width: 100%; height: 100%; min-height: 0; border: 0; background: var(--paper); }
.document-actions { display: flex; justify-content: center; gap: 10px; padding: 12px; border-top: 1px solid #47443f; background: #11110f; }

.teacher-curriculum-map { margin: 1.35rem 0; padding: 1.25rem; border: 1px solid var(--ink); background: #ece6da; }
.teacher-curriculum-map > div { display: grid; grid-template-columns: 9rem 1fr; gap: .35rem 1.2rem; align-items: baseline; padding-bottom: 1rem; border-bottom: 1px solid rgba(36, 35, 31, .28); }
.teacher-curriculum-map > div span { grid-row: 1 / span 2; color: var(--coral); font-size: .7rem; font-weight: 800; letter-spacing: .11em; }
.teacher-curriculum-map h4 { margin: 0; font-size: 1.1rem; }
.teacher-curriculum-map p { margin: .25rem 0 0; line-height: 1.7; }
.teacher-curriculum-map dl { margin: 0; }
.teacher-curriculum-map dl div { display: grid; grid-template-columns: 9rem 1fr; gap: 1.2rem; padding: .8rem 0; border-bottom: 1px solid rgba(36, 35, 31, .18); }
.teacher-curriculum-map dl div:last-child { border-bottom: 0; padding-bottom: 0; }
.teacher-curriculum-map dt { font-weight: 800; }
.teacher-curriculum-map dd { margin: 0; line-height: 1.7; }
.panel-curriculum { margin-top: 1.4rem; padding-top: 1.25rem; border-top: 1px solid currentColor; }
.panel-curriculum h3 { margin: .35rem 0 .6rem; font-size: 1.05rem; }
.panel-curriculum p, .panel-curriculum li { font-size: .82rem; line-height: 1.65; }
.panel-curriculum ul { margin: .8rem 0 0; padding-left: 1.2rem; }

@media (max-width: 600px) {
  .player-head [data-hint-toggle],
  .player-head [data-design-toggle] { display: inline-flex; min-height: 32px; padding-inline: 8px; font-size: 0.58rem; }
  .slide-workspace { position: relative; display: block; }
  .slide-workspace .slide-stage { height: 100%; }
  .player-panel { position: absolute; z-index: 3; inset: 0 0 0 auto; width: min(90vw, 390px); border-left: 1px solid var(--ink); box-shadow: -14px 0 30px rgba(0, 0, 0, 0.28); }
  .teacher-curriculum-map > div, .teacher-curriculum-map dl div { grid-template-columns: 1fr; gap: .35rem; }
  .teacher-curriculum-map > div span { grid-row: auto; }
}

/* Keep the HTML canvas proportional after the legacy kind accents above. */
.slide::after,
.slide[data-kind="gate"]::after,
.slide[data-kind="opening"]::after,
.slide[data-kind="reveal"]::after,
.slide[data-kind="checkpoint"]::after,
.slide[data-kind="revision"]::after,
.slide[data-kind="summary"]::after { width: .72cqw; }
.slide-prompt span { margin-bottom: .35cqw; font-size: .64cqw; }
.slide[data-kind="reconsider"] .slide-content::before { display: none; }

/* In portrait view, the HTML slide becomes a readable vertical lesson card. */
@media (max-width: 760px) {
  .slide-stage { display: block; overflow: auto; container-type: normal; }
  .slide-frame { width: 100%; height: auto; min-height: 100%; max-height: none; aspect-ratio: auto; container-type: inline-size; }
  .slide { height: auto; min-height: 100%; overflow: visible; grid-template-rows: auto auto auto; }
  .slide-story-strip { grid-template-columns: 1fr; }
  .slide-story-strip > .slide-eyebrow { min-height: 42px; padding: .65rem .9rem; border-right: 0; border-bottom: 1px solid currentColor; font-size: .65rem; }
  .slide-story-strip > div > span { min-height: 46px; padding: .5rem .38rem; }
  .slide-story-strip b { font-size: .56rem; }
  .slide-story-strip small { display: none; }
  .slide-main { display: block; }
  .slide-content { min-height: 430px; padding: 1.35rem 1.15rem 1rem; border-right: 0; border-bottom: 1px solid currentColor; }
  .slide-scene { margin-bottom: .9rem; font-size: .7rem; line-height: 1.55; -webkit-line-clamp: 3; }
  .slide-scene span { margin-right: .45rem; font-size: .57rem; }
  .slide h2, .slide[data-title-length="long"] h2 { font-size: clamp(1.65rem, 8.2vw, 2.2rem); line-height: 1.18; }
  .slide .slide-lead { margin-top: .85rem; font-size: .79rem; line-height: 1.65; -webkit-line-clamp: 5; }
  .slide-subject { margin-top: auto; padding-top: .85rem; border-top-width: 4px; }
  .slide-subject span { margin-bottom: .42rem; font-size: .58rem; }
  .slide-subject strong { font-size: .92rem; line-height: 1.6; }
  .slide-continuity { margin-top: .75rem; }
  .slide-continuity span { padding-right: .65rem; font-size: .62rem; line-height: 1.55; }
  .slide-continuity span + span { padding-left: .65rem; }
  .slide-visual { min-height: 410px; padding: 1.25rem 1.05rem; }
  .slide-figure { min-height: 370px; }
  .figure-heading { gap: .7rem; padding-bottom: .7rem; }
  .figure-heading span { font-size: .57rem; }
  .figure-heading strong { font-size: .82rem; text-align: right; }
  .slide-figure figcaption { grid-template-columns: 1fr; gap: .35rem; padding-top: .7rem; }
  .slide-figure figcaption b { font-size: .78rem; }
  .slide-figure figcaption span { font-size: .68rem; line-height: 1.55; }
  .flow-nodes, .revision-track, .evidence-ladder, .story-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem; }
  .flow-node, .revision-node, .evidence-rung, .story-step { min-height: 112px; padding: .8rem !important; border: 1px solid currentColor !important; }
  .flow-node::after { display: none; }
  .flow-node span, .revision-node span, .evidence-rung span, .story-step span { font-size: .56rem; }
  .flow-node strong, .revision-node strong, .evidence-rung strong, .story-step strong { font-size: .78rem; line-height: 1.45; }
  .story-step small { font-size: .62rem; }
  .concept-orbit { min-height: 270px; }
  .orbit-core { width: 42%; min-height: 86px; padding: .7rem; }
  .orbit-core span { font-size: .52rem; }
  .orbit-core strong { font-size: .7rem; }
  .orbit-node { width: 34%; min-height: 58px; padding: .45rem !important; font-size: .61rem !important; }
  .comparison-pair { gap: .65rem; }
  .comparison-option { min-height: 132px; padding: .75rem !important; }
  .comparison-option span { font-size: .55rem; }
  .comparison-option strong { font-size: .75rem; }
  .evidence-slider { grid-template-columns: 1fr; gap: .45rem; }
  .evidence-slider span, .evidence-slider output { font-size: .62rem; }
  .figure-step-controls { gap: .65rem; padding-top: .65rem; }
  .figure-step-controls button { min-height: 34px; padding: .4rem .65rem; font-size: .62rem; }
  .figure-step-controls span { font-size: .58rem; }
  .slide-task { grid-template-columns: 1fr; }
  .slide-prompt { padding: 1rem 1.15rem; }
  .slide-prompt span { margin-bottom: .45rem; font-size: .58rem; }
  .slide-prompt strong { font-size: .8rem; line-height: 1.55; }
  .slide-editorial .slide-prompt { padding: 1rem 1.15rem; }
  .slide-editorial .slide-prompt span { margin-bottom: .45rem; font-size: .58rem; }
  .slide-editorial .slide-prompt strong { font-size: .8rem; line-height: 1.55; }
  .slide-quick-record { padding: .9rem 1.15rem 1.15rem; border-top: 1px solid currentColor; border-left: 0; }
  .slide-quick-record span { margin-bottom: .45rem; font-size: .57rem; }
  .slide-quick-record input { min-height: 42px; padding: .6rem .7rem; font-size: .72rem; }
}