.v2-page {
  --v2-ink: #132b3b;
  --v2-muted: #5e7180;
  --v2-line: #d8e2e5;
  --v2-paper: #f6f7f3;
  --v2-card: #ffffff;
  --v2-blue: #315cf4;
  --v2-teal: #0b8178;
  --v2-purple: #7553b9;
  --v2-amber: #b77920;
  --v2-shadow: 0 22px 60px rgba(28, 51, 62, .09);
  background: var(--v2-paper);
  color: var(--v2-ink);
}

.v2-page .toc nav a {
  align-items: center;
}

.v2-page .reading-layout {
  grid-template-columns: minmax(220px, 252px) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 68px);
  max-width: 1580px;
  margin-inline: auto;
}

.v2-page .reading-main {
  width: min(100%, 1120px);
  max-width: 1120px;
}

.v2-page .toc nav a {
  min-height: 45px;
}

.v2-page .hero {
  padding: 6px 0 42px;
}

.v2-page .hero > .eyebrow {
  margin-bottom: 8px;
}

.v2-page .hero > h1 {
  max-width: 820px;
  margin: 0 0 14px;
  font-size: clamp(36px, 3.45vw, 49px);
  line-height: 1.16;
}

.v2-page .hero > .hero-lead {
  max-width: 720px;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}

.v2-overview-shell {
  margin: 24px 0 32px;
  padding: clamp(16px, 2vw, 24px);
  border: 1px solid rgba(49, 92, 244, .18);
  border-radius: 26px;
  background: linear-gradient(135deg, rgba(255,255,255,.98), rgba(240,246,246,.96));
  box-shadow: var(--v2-shadow);
}

.v2-overview-shell [data-v3-global-map]:empty {
  display: none;
}

.v2-overview-shell [data-v3-global-map]:not(:empty) {
  margin-bottom: 16px;
}

.v2-page-role {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 10px;
  margin: 0 0 16px;
}

.v2-page-role > span,
.v2-page-role > a {
  display: block;
  padding: 11px 13px;
  border: 1px solid var(--v2-line);
  border-radius: 10px;
  background: rgba(255,255,255,.78);
  color: #5b6e7c;
  font-size: 13px;
  line-height: 1.55;
  text-decoration: none;
}

.v2-page-role b {
  color: var(--v2-ink);
}

.v2-page-role a:hover,
.v2-page-role a:focus-visible {
  border-color: var(--v2-blue);
  color: #315cf4;
}

.v2-reading-paths {
  margin: 28px 0 34px;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid rgba(11, 129, 120, .24);
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(255,255,255,.98), rgba(237,248,244,.96));
  box-shadow: 0 16px 42px rgba(27, 62, 66, .08);
}

.v2-reading-paths > header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 24px;
  margin-bottom: 18px;
}

.v2-reading-kicker {
  margin: 0 0 3px;
  color: #0a7970;
  font-size: 11px;
  font-weight: 780;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.v2-reading-paths h2 {
  margin: 0 0 5px;
  font-size: clamp(25px, 2.4vw, 32px);
}

.v2-reading-paths header p:last-child {
  max-width: 650px;
  margin: 0;
  color: #5b6e7c;
  font-size: 14px;
  line-height: 1.65;
}

.v2-graph-reference {
  flex: 0 0 auto;
  padding: 9px 12px;
  border-radius: 9px;
  background: rgba(255,255,255,.82);
  color: #0a7970;
  font-size: 13px;
  font-weight: 680;
  line-height: 1.45;
  text-decoration: none;
}

.v2-graph-reference:hover,
.v2-graph-reference:focus-visible {
  background: #fff;
  box-shadow: inset 0 0 0 1px rgba(11, 129, 120, .28);
}

.v2-reading-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.v2-reading-card {
  display: flex;
  min-width: 0;
  min-height: 178px;
  flex-direction: column;
  padding: 17px;
  border: 1px solid var(--v2-line);
  border-radius: 15px;
  background: rgba(255,255,255,.88);
  color: var(--v2-ink);
  text-decoration: none;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

.v2-reading-card.is-primary {
  border-color: rgba(49, 92, 244, .35);
  background: linear-gradient(145deg, #fff, #f0f4ff);
}

.v2-reading-card:hover,
.v2-reading-card:focus-visible {
  border-color: var(--v2-blue);
  box-shadow: 0 10px 25px rgba(28, 51, 62, .1);
  transform: translateY(-2px);
}

.v2-reading-card small {
  color: #0a7970;
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .08em;
}

.v2-reading-card strong {
  margin: 8px 0 5px;
  font-size: 18px;
  line-height: 1.35;
}

.v2-reading-card > span {
  color: #5b6e7c;
  font-size: 13px;
  line-height: 1.65;
}

.v2-reading-card > b {
  margin-top: auto;
  padding-top: 12px;
  color: #315cf4;
  font-size: 13px;
}

.v2-reading-goals {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(11, 129, 120, .16);
}

.v2-reading-goals p {
  display: flex;
  min-width: 0;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  color: #5b6e7c;
  font-size: 12px;
  line-height: 1.5;
}

.v2-reading-goals small {
  flex: 0 0 auto;
  color: #0a7970;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .06em;
}

.v2-reading-goals b {
  font-weight: 620;
}

.v2-overview-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 9px;
}

.v2-overview-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 10px 12px;
  border: 1px solid var(--v2-line);
  border-radius: 12px;
  background: rgba(255,255,255,.82);
  color: var(--v2-ink);
  text-decoration: none;
  font-weight: 650;
  line-height: 1.35;
}

.v2-overview-nav a:hover,
.v2-overview-nav a:focus-visible {
  border-color: var(--v2-blue);
  transform: translateY(-1px);
}

.v2-overview-nav small {
  color: #315cf4;
  font: 700 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.v2-unit {
  position: relative;
  padding: clamp(52px, 6vw, 82px) 0 clamp(70px, 8vw, 112px);
  border-top: 1px solid rgba(19, 43, 59, .12);
}

.v2-unit::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: min(160px, 28%);
  height: 3px;
  background: linear-gradient(90deg, var(--v2-blue), var(--v2-teal));
}

.v2-unit-heading {
  display: grid;
  grid-template-columns: 146px minmax(0, 1fr);
  gap: clamp(22px, 3vw, 42px);
  align-items: start;
  margin-bottom: clamp(34px, 5vw, 62px);
}

.v3-chapter-map:empty,
.v3-output-loop-slot:empty,
.v3-model-history-slot:empty {
  display: none;
}

.v3-chapter-map:not(:empty) {
  margin: -28px 0 34px 154px;
}

.v3-map-handoff {
  margin: 58px 0 16px;
  padding: 18px 20px;
  border-left: 4px solid var(--v2-teal);
  background: #f1f8f6;
}

.v3-map-handoff > span {
  color: #0a7970;
  font-size: 12px;
  font-weight: 760;
  letter-spacing: .08em;
}

.v3-map-handoff > p {
  max-width: 820px;
  margin: 7px 0 0;
  color: #5b6e7c;
  font-size: 15px;
  line-height: 1.72;
}

.v3-map-handoff + .v3-chapter-map:not(:empty) {
  margin: 0 0 48px;
}

.v3-output-loop-slot:not(:empty),
.v3-model-history-slot:not(:empty) {
  margin: 20px 0 24px;
}

.v2-unit-index {
  position: sticky;
  top: 28px;
  display: grid;
  gap: 5px;
  align-content: start;
}

.v2-unit-index span {
  color: #315cf4;
  font: 700 clamp(40px, 5vw, 66px)/.9 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: -.08em;
}

.v2-unit-index small {
  max-width: 132px;
  text-wrap: balance;
  word-break: keep-all;
  color: #5b6e7c;
  font-size: 11px;
  line-height: 1.45;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.v2-unit-kicker {
  margin: 0 0 10px;
  color: #0a7970;
  font-size: 12px;
  font-weight: 760;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.v2-unit-heading h2 {
  margin: 0 0 12px;
  font-size: clamp(30px, 4.2vw, 52px);
  line-height: 1.15;
  letter-spacing: -.04em;
}

.v2-unit-question {
  margin: 0 0 18px;
  color: #315cf4;
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 680;
  line-height: 1.45;
}

.v2-unit-intro {
  max-width: 760px;
  margin: 0;
  color: #5b6e7c;
  font-size: 17px;
  line-height: 1.85;
}

.v2-route-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 48px;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.v2-route-strip li {
  display: flex;
  align-items: center;
  gap: 11px;
  min-height: 72px;
  padding: 13px;
  border: 1px solid var(--v2-line);
  border-radius: 14px;
  background: var(--v2-card);
}

.v2-route-strip b {
  display: grid;
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 50%;
  background: #eaf0ff;
  color: var(--v2-blue);
  font-size: 12px;
}

.v2-route-strip span {
  font-size: 14px;
  font-weight: 680;
  line-height: 1.35;
}


.v2-unit-nav {
  margin: 6px 0 38px;
  padding: 15px 20px 16px;
  border: 1px solid var(--v2-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, .66);
}

.v2-unit-nav > p {
  margin: 0 0 11px;
  color: #0a7970;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .08em;
}

.v2-unit-nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.v2-unit-nav li {
  display: flex;
  align-items: center;
}

.v2-unit-nav li + li::before {
  flex: none;
  width: 16px;
  height: 1px;
  margin: 0 4px;
  background: var(--v2-line);
  content: "";
}

.v2-unit-nav a {
  display: inline-flex;
  gap: 9px;
  align-items: center;
  min-height: 36px;
  padding: 5px 13px 5px 6px;
  border-radius: 999px;
  color: var(--v2-ink);
  font-size: 13px;
  font-weight: 650;
  line-height: 1.45;
  text-decoration: none;
}

.v2-unit-nav a b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 23px;
  height: 23px;
  border-radius: 50%;
  background: #e6ecfb;
  color: #305af0;
  font-size: 12px;
  font-weight: 800;
}

.v2-unit-nav a:hover,
.v2-unit-nav a:focus-visible {
  background: #eef3ff;
  color: var(--v2-blue);
}

.v2-unit-nav a:hover b,
.v2-unit-nav a:focus-visible b {
  background: var(--v2-blue);
  color: #fff;
}

.v2-stop-anchor {
  display: block;
  height: 1px;
  scroll-margin-top: 36px;
}

.v3-phase-heading {
  scroll-margin-top: 42px;
}

.v3-phase-heading:not(.v3-concept-bridge) {
  margin: 34px 0 26px;
  padding: 16px 20px;
  border-left: 4px solid var(--v2-blue);
  border-radius: 0 14px 14px 0;
  background: linear-gradient(90deg, rgba(49, 92, 244, .08), rgba(255, 255, 255, .48));
}

.v3-phase-heading > span {
  color: #0a7970;
  font-size: 12px;
  font-weight: 760;
  letter-spacing: .08em;
}

.v3-phase-heading:not(.v3-concept-bridge) h3 {
  margin: 5px 0 5px;
  font-size: clamp(21px, 2.4vw, 27px);
  line-height: 1.35;
}

.v3-phase-heading:not(.v3-concept-bridge) p {
  margin: 0;
  color: #5b6e7c;
  font-size: 14px;
  line-height: 1.65;
}

.v2-stage-pause {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  margin: 34px 0 46px;
  padding: 13px 16px;
  border-top: 1px solid var(--v2-line);
  border-bottom: 1px solid var(--v2-line);
}

.v2-stage-pause span {
  color: #0a7970;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .08em;
}

.v2-stage-pause p {
  margin: 0;
  color: #5b6e7c;
  font-size: 13px;
  line-height: 1.65;
}

.v2-source-block {
  position: relative;
  margin: 52px 0;
  scroll-margin-top: 38px;
}

.v2-source-block + .v2-source-block {
  padding-top: 50px;
  border-top: 1px dashed rgba(19, 43, 59, .17);
}

.v2-source-heading {
  display: grid;
  grid-template-columns: minmax(140px, .32fr) minmax(0, 1fr);
  gap: 24px;
  align-items: baseline;
  margin: 0 0 24px;
}

.v2-source-heading > span {
  color: #5b6e7c;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
}

.v2-source-heading h3 {
  margin: 0;
  font-size: clamp(22px, 2.7vw, 31px);
  line-height: 1.3;
  letter-spacing: -.02em;
}

.v3-source-heading {
  display: block;
}

.v2-history-context .v2-source-heading,
.v3-secondary-material .v2-source-heading {
  display: block;
  width: 100%;
}

.v2-history-context .v2-source-heading > span,
.v3-secondary-material .v2-source-heading > span {
  display: block;
  margin-bottom: 6px;
}

.v2-history-context .v2-source-heading h3,
.v3-secondary-material .v2-source-heading h3,
.v2-history-context h3,
.v3-secondary-material h3,
.v2-history-context h4,
.v3-secondary-material h4 {
  width: 100%;
  max-width: none;
  font-size: 20px;
  line-height: 1.4;
}

.v2-history-context .v2-source-block > .chapter-intro,
.v3-secondary-material .v2-source-block > .chapter-intro {
  margin-left: 0;
}

.v2-source-block > .chapter-intro {
  margin: -6px 0 30px;
  color: #5b6e7c;
}

.v2-source-block > .ap17-subnav {
  display: none;
}

.v2-legacy-anchor {
  position: absolute;
  top: -26px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  scroll-margin-top: 36px;
}

.v2-legacy-map {
  margin: 0 0 42px;
  padding: 20px 22px;
  border: 1px solid #d8e1ea;
  border-left: 4px solid var(--v2-purple);
  border-radius: 12px;
  background: #fbfcff;
  scroll-margin-top: 36px;
}

.v2-legacy-map > summary {
  color: var(--v2-purple);
  font-size: 16px;
  font-weight: 730;
  line-height: 1.5;
  cursor: pointer;
}

.v2-legacy-map > div {
  padding-top: 12px;
}

.v2-legacy-map > span {
  color: var(--v2-purple);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .08em;
}

.v2-legacy-map h3 {
  margin: 5px 0 8px;
  font-size: 18px;
}

.v2-legacy-map p {
  margin: 0 0 12px;
  color: #5b6e7c;
  font-size: 14px;
}

.v2-legacy-map nav {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.v2-legacy-map nav a {
  padding: 5px 9px;
  border-radius: 7px;
  background: white;
  color: #315cf4;
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}

.v2-object-legend,
.v2-two-concepts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 42px;
}

.v2-object-legend > div,
.v2-two-concepts > article {
  padding: 18px;
  border: 1px solid var(--v2-line);
  border-radius: 15px;
  background: var(--v2-card);
}

.v2-object-legend b,
.v2-object-legend span {
  display: block;
}

.v2-object-legend b {
  margin-bottom: 4px;
  color: #315cf4;
}

.v2-object-legend span {
  color: #5b6e7c;
  font-size: 13px;
}

.v2-two-concepts {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 40px 0 52px;
}

.v2-two-concepts > article {
  padding: clamp(20px, 3vw, 30px);
}

.v2-two-concepts article > span,
.v2-card-kicker {
  color: #0a7970;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .08em;
}

.v2-two-concepts h3 {
  margin: 7px 0 12px;
  font-size: 21px;
  line-height: 1.35;
}

.v2-two-concepts p {
  margin: 0 0 12px;
  color: #5b6e7c;
  font-size: 15px;
}

.v2-visibility-primer,
.v2-crosslayer-primer,
.v2-problem-triad,
.v3-concept-bridge,
.v3-history-thread {
  margin: 46px 0;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--v2-line);
  border-radius: 18px;
  background: var(--v2-card);
}

.v2-visibility-primer > span,
.v2-crosslayer-primer > span,
.v2-problem-triad > span,
.v3-concept-bridge > span,
.v3-history-thread > span {
  color: #0a7970;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .08em;
}

.v2-visibility-primer h3,
.v2-crosslayer-primer h3,
.v2-problem-triad h3,
.v3-concept-bridge h3,
.v3-history-thread h3 {
  margin: 6px 0 18px;
  font-size: clamp(21px, 2.5vw, 28px);
  line-height: 1.35;
}

.v2-visibility-primer > div,
.v2-problem-triad > div {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.v2-visibility-primer > div p,
.v2-problem-triad article {
  margin: 0;
  padding: 15px;
  border-radius: 11px;
  background: #f4f7fa;
}

.v2-visibility-primer > p {
  margin: 14px 0 0;
  color: #5b6e7c;
  font-size: 14px;
}

.v2-problem-triad > div {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.v2-problem-triad article b {
  display: block;
  margin-bottom: 5px;
  color: #315cf4;
}

.v2-problem-triad article p {
  margin: 0;
  color: #5b6e7c;
  font-size: 13px;
  line-height: 1.6;
}

.v3-concept-bridge p,
.v3-history-thread > p {
  max-width: 820px;
  margin: 10px 0 0;
  color: #5b6e7c;
  font-size: 15px;
  line-height: 1.72;
}

.v3-history-thread ol {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.v3-history-thread li {
  padding: 15px;
  border: 1px solid rgba(49, 92, 244, .12);
  border-radius: 12px;
  background: #f4f7fa;
}

.v3-history-thread li b {
  color: #315cf4;
  font-size: 14px;
}

.v3-history-thread li p {
  margin: 6px 0 0;
  color: #5b6e7c;
  font-size: 13px;
  line-height: 1.6;
}

.v2-crosslayer-primer dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin: 0;
}

.v2-crosslayer-primer dl > div {
  padding: 13px 14px;
  border-radius: 10px;
  background: #f4f7fa;
}

.v2-crosslayer-primer dt {
  color: #315cf4;
  font-size: 13px;
  font-weight: 760;
}

.v2-crosslayer-primer dd {
  margin: 4px 0 0;
  color: #5b6e7c;
  font-size: 13px;
  line-height: 1.6;
}

.v2-crosslayer-primer > p {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--v2-purple);
  background: #f8f6fc;
  color: var(--v2-muted);
  font-size: 13px;
}

.v2-history-context,
.v2-depth-note,
.v3-secondary-material {
  margin: 24px 0 46px;
  border: 1px solid var(--v2-line);
  border-radius: 13px;
  background: rgba(255,255,255,.68);
}

.v2-history-context > summary,
.v2-depth-note > summary,
.v3-secondary-material > summary {
  padding: 14px 17px;
  color: #315cf4;
  font-size: 16px;
  font-weight: 730;
  cursor: pointer;
}

.v2-history-context > div,
.v2-depth-note > div,
.v3-secondary-material > div {
  padding: 0 18px 18px;
}

.v2-history-context .v2-source-block {
  margin: 28px 0 0;
}

.v2-formula,
.v2-equation {
  overflow-x: auto;
  padding: 12px 14px;
  border-radius: 10px;
  background: #f1f5ff;
  color: var(--v2-ink) !important;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.v2-note {
  color: #5b6e7c;
  font-size: 13px !important;
}

.v3-compat-anchor {
  display: block;
  width: 1px;
  height: 1px;
  overflow: hidden;
  scroll-margin-top: 44px;
}

.v3-learning-cue {
  margin: 10px 0 0;
  color: #5b6e7c;
  font-size: 16px;
  line-height: 1.7;
}

.v3-unit-note {
  padding: 10px 12px;
  border-radius: 10px;
  background: #f1f5ff;
  color: var(--v2-muted);
  font-size: 14px !important;
  line-height: 1.65 !important;
}

.v3-follow-link {
  margin: 22px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--v2-teal);
  background: #f1f8f6;
  color: var(--v2-muted);
  font-size: 14px;
  line-height: 1.65;
}

.v3-follow-link a {
  color: #315cf4;
  font-weight: 720;
}

.v2-layer-primer {
  display: grid;
  grid-template-columns: minmax(150px, 1fr) auto minmax(170px, 1.2fr) auto minmax(150px, 1fr) auto minmax(140px, .9fr);
  gap: 9px;
  align-items: center;
  margin: 0 0 46px;
  padding: 18px;
  border: 1px solid var(--v2-line);
  border-radius: 18px;
  background: white;
}

.v2-layer-primer div {
  min-height: 74px;
  padding: 12px;
  border-radius: 11px;
  background: #f5f7fa;
}

.v2-layer-primer span,
.v2-layer-primer b {
  display: block;
}

.v2-layer-primer span {
  color: #5b6e7c;
  font-size: 11px;
}

.v2-layer-primer b {
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.35;
}

.v2-layer-primer i {
  color: #315cf4;
  font-size: 11px;
  font-style: normal;
  font-weight: 720;
  white-space: nowrap;
}

.v2-concept-card,
.v2-return-loop,
.v2-final-check {
  margin: 48px 0;
  padding: clamp(22px, 3.5vw, 36px);
  border: 1px solid rgba(49, 92, 244, .2);
  border-radius: 20px;
  background: linear-gradient(135deg, #fff, #f3f7ff);
}

.v2-concept-card h3 {
  margin: 7px 0 13px;
  font-size: clamp(22px, 2.6vw, 30px);
}

.v2-output-loop > div > .v2-equation {
  margin-bottom: 18px;
}

.v2-output-loop .v2-depth-note {
  margin-bottom: 0;
  background: white;
}

.v2-concept-card p,
.v2-return-loop p,
.v2-final-check p {
  max-width: 800px;
}

.v2-equation {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 20px;
}

.v2-equation span {
  color: #5b6e7c;
  font-family: var(--sans);
  font-size: 12px;
}

.v2-equation i {
  color: #315cf4;
  font-style: normal;
}

.v2-lab-slot:not(:empty) {
  margin: 54px 0;
}

.v2-lab-slot:empty {
  display: none;
}

.v2-moved-section {
  margin: 52px 0;
}

.v2-layer-material {
  margin-top: 48px;
}

.v2-checkpoint {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  margin-top: 48px;
  padding: 14px 16px;
  border-top: 1px solid var(--v2-line);
  border-bottom: 1px solid var(--v2-line);
  background: rgba(255,255,255,.52);
}

.v2-checkpoint-answer {
  min-width: 0;
}

.v2-checkpoint-answer > b {
  display: block;
  color: var(--v2-ink);
  font-size: 16px;
  font-weight: 720;
  line-height: 1.55;
}

.v2-checkpoint p {
  margin: 8px 0 0;
  color: #5b6e7c;
  font-size: 13px;
  line-height: 1.65;
}

.v2-checkpoint a,
.v2-return-loop a,
.v2-final-check a {
  color: #315cf4;
  font-size: 13px;
  font-weight: 730;
  text-decoration: none;
  white-space: nowrap;
}

.v2-return-loop {
  border-color: rgba(11, 129, 120, .25);
  background: linear-gradient(135deg, #fff, #eff9f6);
}

.v2-final-check {
  margin-bottom: 0;
  border-color: rgba(183, 121, 32, .3);
  background: linear-gradient(135deg, #fff, #fff9ee);
}

.v2-final-check > h3 {
  margin: 0;
  color: #93611a;
  font-size: 19px;
  font-weight: 760;
}

.v2-final-check > div {
  padding-top: 4px;
}

.v3-cache-example > div > p:first-child {
  margin-top: 4px;
  color: var(--v2-ink);
  font-size: 15px;
  line-height: 1.72;
}

.v2-final-check ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 28px;
  margin: 18px 0 22px;
  padding-left: 22px;
}

.v2-final-check li {
  padding-left: 4px;
}

@media (max-width: 1080px) {
  .v2-page .reading-layout {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 30px;
  }

  .v2-overview-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .v2-unit-heading {
    grid-template-columns: 82px minmax(0, 1fr);
  }

  .v2-layer-primer {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .v2-layer-primer i {
    display: none;
  }
}

@media (max-width: 820px) {
  .v2-page .reading-layout {
    display: block;
  }

  .v2-unit-heading,
  .v2-source-heading {
    grid-template-columns: 1fr;
  }

  .v2-unit-index {
    position: static;
    grid-template-columns: auto 1fr;
    align-items: end;
  }

  .v2-source-block > .chapter-intro {
    margin-left: 0;
  }

  .v2-unit-nav {
    margin-left: 0;
  }

  .v3-chapter-map:not(:empty) {
    margin-left: 0;
  }

  .v2-route-strip,
  .v2-object-legend,
  .v3-history-thread ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .v2-checkpoint {
    grid-template-columns: 1fr;
  }

  .v2-checkpoint a {
    justify-self: start;
  }

  .v2-reading-paths > header {
    display: block;
  }

  .v2-graph-reference {
    display: inline-block;
    margin-top: 12px;
  }

  .v2-reading-cards,
  .v2-reading-goals {
    grid-template-columns: 1fr;
  }

  .v2-reading-card {
    min-height: 0;
  }
}

@media (max-width: 520px) {
  .v2-overview-shell {
    margin-top: 28px;
    padding: 20px;
    border-radius: 18px;
  }

  .v2-reading-paths {
    margin-top: 22px;
    padding: 18px;
    border-radius: 18px;
  }

  .v2-overview-nav,
  .v2-route-strip,
  .v2-object-legend,
  .v2-two-concepts,
  .v2-layer-primer,
  .v2-page-role,
  .v2-visibility-primer > div,
  .v2-problem-triad > div,
  .v2-crosslayer-primer dl,
  .v2-final-check ol {
    grid-template-columns: 1fr;
  }

  .v2-unit {
    padding-block: 48px 74px;
  }

  .v2-unit-heading {
    gap: 18px;
  }

  .v2-source-block {
    margin-block: 40px;
  }

  .v2-checkpoint {
    margin-top: 48px;
    padding-inline: 16px;
  }
}

#generation-rounds .fv9-connector i {
  width: 2px;
  font-style: normal;
  transform: none;
}
#generation-rounds .fv9-connector i::after {
  left: 50%;
  bottom: 0;
  width: 9px;
  height: 9px;
  box-sizing: border-box;
  transform: translate(-50%, 0) rotate(45deg);
  transform-origin: center;
}

@media (prefers-reduced-motion: reduce) {
  .v2-overview-nav a,
  .v2-reading-card {
    transform: none !important;
  }
}


.v3-quiz {
  margin: 4px 0 40px;
}

.v3-quiz-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.v3-quiz-list > li {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 20px 18px;
  border: 1px solid var(--v2-line);
  border-radius: 13px;
  background: #fbfcfb;
}

.v3-quiz-topic {
  display: flex;
  gap: 9px;
  align-items: center;
  margin: 0;
  color: #5b6e7c;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .06em;
}

.v3-quiz-topic b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 21px;
  height: 21px;
  border-radius: 50%;
  background: #e6ecfb;
  color: #305af0;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.v3-quiz-ask {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
}

.v3-quiz-options {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}


.v3-quiz-options button {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  justify-content: flex-start;
  width: 100%;
  min-height: 44px;
  padding: 9px 12px;
  border: 1px solid var(--v2-line);
  border-radius: 9px;
  background: #fff;
  color: var(--v2-ink);
  font-size: 13.5px;
  font-weight: 450;
  line-height: 1.65;
  text-align: left;
}

.v3-quiz-options button > i {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  margin-top: 1px;
  border-radius: 50%;
  background: #eef1f0;
  color: #5c6f7d;
  font-size: 11px;
  font-style: normal;
  font-weight: 800;
}

.v3-quiz-options button:hover,
.v3-quiz-options button:focus-visible {
  border-color: var(--v2-blue);
  background: #f4f7ff;
}


[data-quiz-item="done"] .v3-quiz-options button {
  cursor: default;
}

[data-quiz-item="done"] .v3-quiz-options button:hover {
  border-color: var(--v2-line);
  background: #fff;
}

.v3-quiz-options button[data-quiz-state="correct"],
[data-quiz-item="done"] .v3-quiz-options button[data-quiz-state="correct"]:hover {
  border-color: #6ba898;
  background: #eef6f2;
  font-weight: 600;
}

.v3-quiz-options button[data-quiz-state="correct"] > i {
  background: var(--v2-teal);
  color: #fff;
}

.v3-quiz-options button[data-quiz-state="chosen"],
[data-quiz-item="done"] .v3-quiz-options button[data-quiz-state="chosen"]:hover {
  border-color: #d4a68a;
  background: #fbf2ec;
}

.v3-quiz-options button[data-quiz-state="chosen"] > i {
  background: var(--v2-amber);
  color: #fff;
}

.v3-quiz-note {
  margin: 2px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--v2-line);
  color: var(--v2-ink);
  font-size: 13.5px;
  line-height: 1.75;
}

.v3-quiz-note a {
  display: inline-block;
  margin-top: 4px;
  font-size: 13px;
  font-weight: 650;
  white-space: nowrap;
}

@media (max-width: 820px) {
  .v3-quiz-list { grid-template-columns: 1fr; }
}


.toc .toc-sections {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .26s ease;
}

.toc .toc-sections[data-open="true"] {
  grid-template-rows: 1fr;
}

.toc .toc-sections > ol {
  margin: 0;
  padding: 0;
  overflow: hidden;
  list-style: none;
}

.toc .toc-sections[data-open="true"] > ol {
  padding: 2px 0 5px;
}

.toc nav .toc-sections a {
  display: flex;
  align-items: center;
  margin-left: 24px;
  padding: 6px 10px 6px 13px;
  border-left: 1px solid #d5dbd5;
  border-radius: 0 6px 6px 0;
  color: #636d75;
  font-size: 11.5px;
  line-height: 1.5;
}

.toc nav .toc-sections a:hover {
  border-left-color: #a9b3bd;
  background: #eaece8;
}

.toc nav .toc-sections a[aria-current] {
  border-left-color: #254cc9;
  background: #eef2ff;
  color: #254cc9;
  font-weight: 650;
}

@media (prefers-reduced-motion: reduce) {
  .toc .toc-sections { transition: none; }
}


.acost .acost-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0 22px;
  padding: 0;
  list-style: none;
}

.acost .acost-list > li {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 18px 18px 16px;
  border: 1px solid var(--v2-line);
  border-radius: 14px;
  background: #fff;
}

.acost .acost-list > li.is-current {
  border-color: #9fb4ef;
  background: #f6f8ff;
}

.acost .acost-kind {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.5;
}

.acost .acost-kind span {
  color: #5b6e7c;
  font-size: 12.5px;
  font-weight: 450;
}

.acost .acost-read {
  display: flex;
  gap: 6px;
  align-items: baseline;
  margin: 2px 0 0;
  color: #5b6e7c;
  font-size: 14px;
}

.acost .acost-read b {
  color: var(--v2-ink);
  font-size: 30px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
  line-height: 1.15;
}

.acost .acost-list > li.is-current .acost-read b { color: #315cf4; }

.acost .acost-note {
  margin: 0;
  color: #5b6e7c;
  font-size: 13.5px;
  line-height: 1.7;
}

.acost .acost-scale {
  margin: auto 0 0;
  padding-top: 11px;
  border-top: 1px solid var(--v2-line);
  font-size: 13px;
  font-weight: 650;
  line-height: 1.55;
}


.acost .acost-caveat {
  margin: 0;
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--v2-teal);
  font-size: 14.5px;
  line-height: 1.85;
}

@media (max-width: 860px) {
  .acost .acost-list { grid-template-columns: 1fr; }
}