:root {
  --navy-700: #1b3a63;
  --navy: #10233c;
  --blue: #3d7fca;
  --blue-soft: #84b7ec;
  --orange: #ff6b35;
  --orange-dark: #c9451a;
  --cream: #f7f1e7;
  --paper: #fffdf8;
  --muted: #637285;
  --line: rgba(27, 58, 99, .16);
  --ok: #1e7e54;
  --ok-bg: #e3f5ec;
  --danger: #c0392b;
  --danger-bg: #fbe7e4;
  --waiting: #b06a00;
  --waiting-bg: #fff4e0;
  --shadow: 0 18px 48px rgba(27, 58, 99, .12);
  --font-scale: 1;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

html {
  overflow: hidden;
}

body {
  overflow: hidden;
  background: var(--cream);
  color: var(--navy);
  font-family: Calibri, "Segoe UI", system-ui, Arial, sans-serif;
  font-size: calc(16px * var(--font-scale));
  line-height: 1.45;
}

button,
input,
a {
  font: inherit;
}

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

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(255, 107, 53, .55);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 99;
  top: 8px;
  left: 8px;
  transform: translateY(-150%);
  border-radius: 10px;
  background: var(--navy-700);
  color: #fff;
  padding: 9px 14px;
  text-decoration: none;
  font-weight: 800;
}

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

.app-shell {
  display: grid;
  grid-template-rows: 58px 52px minmax(0, 1fr) 62px;
  width: 100%;
  height: 100dvh;
  overflow: hidden;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(190px, .7fr) minmax(280px, 1.6fr) auto;
  align-items: center;
  gap: 14px;
  padding: 7px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  border: 2px solid rgba(27, 58, 99, .25);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy-700) 0 62%, var(--orange) 62%);
  color: #fff;
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  font-weight: 900;
}

.brand-copy,
.module-name {
  display: flex;
  min-width: 0;
  flex-direction: column;
}

.brand-copy strong,
.module-name strong {
  overflow: hidden;
  color: var(--navy-700);
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  line-height: 1.05;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-copy span,
.module-name span {
  overflow: hidden;
  margin-top: 2px;
  color: var(--muted);
  font-size: .72em;
  font-weight: 800;
  letter-spacing: .08em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.module-name {
  text-align: center;
}

.module-name strong {
  font-size: 1.05em;
}

.reading-tools {
  display: flex;
  align-items: center;
  gap: 5px;
}

.reading-tools button {
  min-width: 42px;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--cream);
  color: var(--navy-700);
  cursor: pointer;
  font-size: .78em;
  font-weight: 900;
}

.reading-tools button[data-font-action="reset"] {
  min-width: 58px;
}

.stepper {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  padding: 7px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--cream);
}

.step-button {
  display: flex;
  min-width: 0;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
  color: var(--muted);
  cursor: pointer;
  font-size: .86em;
}

.step-button span {
  display: grid;
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  font-family: Consolas, monospace;
  font-size: .85em;
  font-weight: 900;
}

.step-button strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.step-button.active {
  border-color: var(--blue);
  background: #f3f7fb;
  color: var(--navy-700);
  box-shadow: inset 0 -4px 0 var(--orange);
}

.step-button.done {
  border-style: double;
  border-width: 3px;
  border-color: var(--ok);
  color: var(--ok);
}

.lesson {
  display: grid;
  min-width: 0;
  min-height: 0;
  grid-template-columns: minmax(245px, 31%) minmax(0, 1fr);
  gap: 12px;
  padding: 10px 14px;
  overflow: hidden;
}

.lesson-copy,
.visual-card {
  min-width: 0;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper);
  box-shadow: 0 2px 10px rgba(27, 58, 99, .10);
}

.lesson-copy {
  display: flex;
  flex-direction: column;
  padding: clamp(14px, 2vw, 24px);
  overflow: hidden;
}

.kicker {
  margin: 0 0 7px;
  color: var(--orange-dark);
  font-size: .72em;
  font-weight: 900;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.lesson-copy h1 {
  margin: 0;
  color: var(--navy-700);
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  font-size: clamp(1.45em, 2.35vw, 2.2em);
  line-height: 1.06;
  letter-spacing: -.015em;
}

.lesson-intro {
  margin: 10px 0 12px;
  color: var(--muted);
  font-size: clamp(.86em, 1.15vw, 1.02em);
  line-height: 1.45;
}

.lesson-detail {
  display: flex;
  min-height: 0;
  flex: 1;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}

.fact-list {
  display: grid;
  gap: 7px;
  margin: 0;
}

.fact {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  align-items: center;
  gap: 9px;
  padding: 8px 9px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--navy-700);
  border-radius: 11px;
  background: var(--cream);
}

.fact-code {
  display: grid;
  min-height: 34px;
  place-items: center;
  border: 2px solid var(--navy-700);
  border-radius: 9px;
  color: var(--navy-700);
  font-family: Consolas, monospace;
  font-weight: 900;
}

.fact strong,
.state-row strong {
  display: block;
  color: var(--navy-700);
  line-height: 1.12;
}

.fact small,
.state-row small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: .78em;
  font-weight: 700;
  line-height: 1.24;
}

.state-summary {
  display: grid;
  gap: 7px;
}

.state-row {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--navy-700);
  border-radius: 10px;
  background: var(--cream);
}

.state-row.open {
  border-left-style: double;
  border-left-width: 7px;
  border-left-color: var(--ok);
}

.state-row.closed {
  border-left-style: dashed;
  border-left-color: var(--danger);
}

.state-row.permanent {
  border-left-style: dotted;
  border-left-color: var(--orange-dark);
}

.key-box,
.danger-box,
.neutral-box {
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--paper);
  font-size: .9em;
  line-height: 1.35;
}

.key-box {
  border: 5px double var(--ok);
}

.danger-box {
  border: 4px dashed var(--danger);
}

.neutral-box {
  border: 2px solid var(--navy-700);
}

.key-box strong,
.danger-box strong,
.neutral-box strong {
  color: var(--navy-700);
}

.danger-box strong {
  color: var(--danger);
}

.visual-card {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  padding: 10px 12px 8px;
  overflow: hidden;
}

.visual-heading {
  display: flex;
  min-width: 0;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.visual-heading h2 {
  margin: 0;
  color: var(--navy-700);
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  font-size: 1.04em;
}

.visual-heading p {
  overflow: hidden;
  margin: 0;
  color: var(--muted);
  font-size: .76em;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.visual-controls {
  display: flex;
  min-height: 0;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 7px 0 4px;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--cream);
}

.control-group-label {
  padding-left: 8px;
  color: var(--muted);
  font-size: .72em;
  font-weight: 900;
  letter-spacing: .07em;
  text-transform: uppercase;
}

.control-button,
.sequence-button,
.gallery-button,
.download-button {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--navy-700);
  cursor: pointer;
  font-size: .76em;
  font-weight: 900;
}

.control-button {
  padding: 5px 11px;
}

.short-label {
  display: none;
}

.control-button.active {
  border: 2px solid var(--blue);
  background: #f3f7fb;
  box-shadow: inset 0 -3px 0 var(--orange);
}

.control-button.circuit-bp.active {
  border-style: solid;
  border-color: var(--blue);
}

.control-button.circuit-hp.active {
  border-style: dashed;
  border-color: var(--danger);
}

.sequence-button {
  border: 2px solid var(--navy-700);
  background: var(--navy-700);
  color: #fff;
  padding: 5px 14px;
}

.sequence-button.playing {
  border-style: dashed;
  border-color: var(--danger);
  background: var(--paper);
  color: var(--danger);
}

.position-range {
  width: min(190px, 23vw);
  accent-color: var(--orange);
}

.flow-control-group,
.rotation-controls {
  width: min(100%, 820px);
  border-radius: 16px;
}

.flow-control-group .control-button,
.rotation-controls .control-button {
  flex: 1 1 260px;
  white-space: normal;
  line-height: 1.18;
}

.flow-summary .active-flow {
  box-shadow: inset 0 -4px 0 var(--orange);
}

.quiz-tabs {
  border-radius: 16px;
}

.quiz-scoreline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--navy-700);
  font-size: .82em;
}

.quiz-scoreline span,
.quiz-counter {
  color: var(--muted);
  font-weight: 900;
}

.quiz-counter {
  font-size: .74em;
}

.quiz-prompt {
  padding: 10px 12px;
  border: 2px solid var(--navy-700);
  border-left-width: 7px;
  border-radius: 12px;
  background: var(--cream);
  color: var(--navy-700);
  line-height: 1.28;
}

.quiz-feedback strong {
  display: block;
  margin-bottom: 3px;
}

.quiz-total {
  display: grid;
  gap: 4px;
}

.quiz-total span {
  color: var(--muted);
  font-size: .78em;
  font-weight: 700;
}

.quiz-unlabelled .vv-label-box-p1,
.quiz-unlabelled .vv-label-box-service,
.quiz-unlabelled .vv-code-dark,
.quiz-unlabelled .vv-label,
.quiz-unlabelled .vv-small {
  display: none;
}

.quiz-hotspot {
  fill: rgba(61, 127, 202, .001);
  stroke: transparent;
  stroke-width: 8;
  cursor: pointer;
}

.quiz-hotspot:hover,
.quiz-hotspot:focus-visible {
  fill: rgba(61, 127, 202, .12);
  stroke: var(--blue);
  stroke-width: 8;
  stroke-dasharray: 8 6;
  outline: none;
}

.quiz-hotspot.is-correct {
  fill: rgba(227, 245, 236, .72);
  stroke: var(--ok);
  stroke-width: 12;
  stroke-dasharray: none;
}

.quiz-hotspot.is-wrong {
  fill: rgba(251, 231, 228, .76);
  stroke: var(--danger);
  stroke-width: 12;
  stroke-dasharray: 18 10;
}

.scenario-stage {
  display: grid;
  width: min(850px, 94%);
  height: 100%;
  min-height: 0;
  grid-template-rows: minmax(66px, .7fr) minmax(0, 2fr);
  align-items: center;
  gap: 12px;
  padding: 18px;
}

.scenario-mark {
  display: grid;
  width: 64px;
  height: 64px;
  place-self: center;
  place-items: center;
  border: 4px solid var(--navy-700);
  border-radius: 50%;
  background: var(--paper);
  color: var(--orange-dark);
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  font-size: 2.1em;
  font-weight: 900;
}

.scenario-choice-grid {
  display: grid;
  min-height: 0;
  grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
  align-content: center;
  gap: 12px;
}

.scenario-choice {
  display: grid;
  min-height: 72px;
  place-items: center;
  gap: 4px;
  padding: 10px 12px;
  border: 2px solid var(--navy-700);
  border-radius: 14px;
  background: var(--paper);
  color: var(--navy-700);
  cursor: pointer;
  line-height: 1.2;
  text-align: center;
}

.scenario-choice span {
  font-size: .72em;
  font-weight: 900;
}

.scenario-choice.is-correct {
  border: 5px double var(--ok);
  background: var(--ok-bg);
}

.scenario-choice.is-wrong {
  border: 4px dashed var(--danger);
  background: var(--danger-bg);
}

.scenario-choice:disabled {
  cursor: default;
  opacity: 1;
}

.game-summary {
  display: grid;
  place-items: center;
  gap: 8px;
  color: var(--navy-700);
  text-align: center;
}

.game-summary-check {
  display: grid;
  width: 72px;
  height: 72px;
  place-items: center;
  border: 6px double var(--ok);
  border-radius: 50%;
  color: var(--ok);
  font-size: 2.2em;
  font-weight: 900;
}

.game-summary strong {
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  font-size: 1.45em;
}

.game-summary-score {
  font-family: Consolas, monospace;
  font-size: 2em;
  font-weight: 900;
}

.game-summary small {
  color: var(--muted);
  font-weight: 700;
}

.visual-root {
  display: grid;
  min-width: 0;
  min-height: 0;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(61, 127, 202, .045), rgba(255, 253, 248, 0));
}

.visual-root > svg,
.visual-root > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.visual-root > .vv-svg {
  width: 92%;
  height: 92%;
}

.visual-caption {
  min-height: 1.25em;
  margin: 5px 4px 0;
  color: var(--muted);
  font-size: .72em;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
}

.gallery-shell {
  display: grid;
  width: 100%;
  height: 100%;
  grid-template-columns: 48px minmax(0, 1fr) 48px;
  align-items: center;
  gap: 8px;
}

.gallery-stage {
  display: grid;
  min-width: 0;
  min-height: 0;
  height: 100%;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 5px;
}

.gallery-stage img {
  min-height: 0;
}

.gallery-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.gallery-button {
  display: grid;
  width: 44px;
  min-width: 44px;
  height: 44px;
  place-items: center;
  border: 2px solid var(--navy-700);
  font-size: 1.15em;
}

.download-button {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 5px 12px;
  text-decoration: none;
}

.download-button.primary-download {
  background: var(--navy-700);
  color: #fff;
}

.bottom-nav {
  display: grid;
  grid-template-columns: minmax(120px, 180px) minmax(160px, 1fr) minmax(120px, 180px);
  align-items: center;
  gap: 14px;
  padding: 8px 14px;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.nav-button {
  min-height: 44px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 900;
}

.nav-button.primary {
  border: 2px solid var(--navy-700);
  background: var(--navy-700);
  color: #fff;
}

.nav-button.secondary {
  border: 2px solid var(--navy-700);
  background: var(--paper);
  color: var(--navy-700);
}

.nav-button:disabled {
  cursor: not-allowed;
  opacity: .42;
}

.progress-copy {
  display: grid;
  justify-items: center;
  gap: 5px;
  color: var(--muted);
  font-size: .75em;
  font-weight: 800;
}

.progress-track {
  width: min(320px, 100%);
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(27, 58, 99, .12);
}

.progress-track span {
  display: block;
  width: 33.333%;
  height: 100%;
  border-radius: inherit;
  background: var(--orange);
  transition: width 180ms ease;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  clip: rect(1px, 1px, 1px, 1px) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
}

@media (max-width: 920px) {
  .app-shell {
    grid-template-rows: 52px 46px minmax(0, 1fr) 56px;
  }

  .topbar {
    grid-template-columns: minmax(135px, .8fr) minmax(180px, 1.4fr) auto;
    padding-inline: 10px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: .85em;
  }

  .module-name strong {
    font-size: .9em;
  }

  .reading-tools button {
    min-width: 35px;
    min-height: 34px;
  }

  .reading-tools button[data-font-action="reset"] {
    min-width: 52px;
  }

  .stepper {
    padding: 5px 8px;
  }

  .step-button {
    min-height: 34px;
    font-size: .76em;
  }

  .step-button span {
    width: 22px;
    height: 22px;
  }

  .lesson {
    grid-template-columns: minmax(220px, 34%) minmax(0, 1fr);
    gap: 8px;
    padding: 7px 8px;
  }

  .lesson-copy {
    padding: 13px;
  }

  .visual-card {
    padding: 7px 8px 5px;
  }

  .control-group-label {
    display: none;
  }
}

@media (max-width: 1100px) and (min-width: 651px) {
  .position-range,
  .control-group-label {
    display: none;
  }

  .visual-controls {
    gap: 4px;
  }

  .control-button,
  .sequence-button {
    padding: 4px 8px;
    font-size: .7em;
  }
}

@media (max-width: 650px) {
  body {
    font-size: calc(13px * var(--font-scale));
  }

  .app-shell {
    grid-template-rows: 44px 34px minmax(0, 1fr) 48px;
  }

  .topbar {
    grid-template-columns: minmax(120px, 1fr) auto;
    gap: 6px;
    padding: 4px 6px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .brand-copy span,
  .module-name {
    display: none;
  }

  .reading-tools {
    gap: 3px;
  }

  .reading-tools button {
    min-width: 32px;
    min-height: 30px;
    padding: 2px 6px;
  }

  .reading-tools button[data-font-action="reset"] {
    min-width: 48px;
  }

  .stepper {
    gap: 4px;
    padding: 3px 4px;
  }

  .step-button {
    min-height: 28px;
    padding: 2px;
    border-radius: 9px;
  }

  .step-button span {
    width: 22px;
    height: 22px;
    font-size: .78em;
  }

  .step-button strong {
    display: none;
  }

  .lesson {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(114px, 30%) minmax(0, 1fr);
    gap: 5px;
    padding: 4px;
  }

  .lesson-copy,
  .visual-card {
    border-radius: 13px;
  }

  .lesson-copy {
    padding: 8px 10px;
  }

  .kicker {
    margin-bottom: 2px;
    font-size: .68em;
  }

  .lesson-copy h1 {
    font-size: clamp(1.28em, 5.2vw, 1.65em);
    line-height: 1;
  }

  .lesson-intro {
    margin: 4px 0 5px;
    font-size: .84em;
    line-height: 1.22;
  }

  .lesson-detail {
    display: block;
    overflow: hidden;
  }

  .fact-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 3px;
  }

  .fact {
    display: flex;
    min-width: 0;
    flex-direction: column;
    gap: 2px;
    padding: 3px;
    border-left-width: 3px;
    text-align: center;
  }

  .fact-code {
    min-height: 22px;
    width: 30px;
  }

  .fact strong {
    font-size: .76em;
  }

  .fact small {
    display: none;
  }

  .state-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px;
  }

  .state-row {
    padding: 4px 6px;
  }

  .state-row strong {
    font-size: .76em;
  }

  .state-row small {
    font-size: .68em;
    line-height: 1.05;
  }

  .key-box,
  .danger-box,
  .neutral-box {
    padding: 5px 7px;
    font-size: .76em;
    line-height: 1.15;
  }

  .visual-card {
    grid-template-rows: auto auto minmax(0, 1fr) auto;
    padding: 4px 5px 3px;
  }

  .visual-heading h2 {
    font-size: .88em;
  }

  .visual-heading p {
    max-width: 65%;
    font-size: .65em;
  }

  .visual-controls {
    gap: 3px;
    padding: 3px 0;
    overflow: hidden;
    flex-wrap: wrap;
    align-content: center;
  }

  .control-group {
    gap: 2px;
    padding: 2px;
  }

  .control-button,
  .sequence-button {
    min-height: 28px;
    padding: 3px 7px;
    font-size: .68em;
  }

  .control-button .long-label,
  .position-range {
    display: none;
  }

  .control-button .short-label {
    display: inline;
  }

  .flow-control-group .control-button,
  .rotation-controls .control-button {
    flex-basis: 145px;
    padding-inline: 5px;
    font-size: .61em;
  }

  body.screen-games .lesson {
    grid-template-rows: minmax(180px, 36%) minmax(0, 1fr);
  }

  .quiz-scoreline {
    font-size: .72em;
  }

  .quiz-counter {
    font-size: .66em;
  }

  .quiz-prompt {
    padding: 6px 8px;
    border-left-width: 5px;
    font-size: .78em;
    line-height: 1.14;
  }

  .quiz-feedback {
    font-size: .69em;
  }

  .quiz-tabs .control-button {
    padding-inline: 6px;
    font-size: .62em;
  }

  .scenario-stage {
    width: 100%;
    grid-template-rows: 42px minmax(0, 1fr);
    gap: 6px;
    padding: 6px;
  }

  .scenario-mark {
    width: 40px;
    height: 40px;
    border-width: 3px;
    font-size: 1.45em;
  }

  .scenario-choice-grid {
    grid-template-columns: repeat(auto-fit, minmax(105px, 1fr));
    gap: 6px;
  }

  .scenario-choice {
    min-height: 52px;
    padding: 5px 6px;
    font-size: .75em;
  }

  .game-summary {
    gap: 4px;
  }

  .game-summary-check {
    width: 48px;
    height: 48px;
    border-width: 4px;
    font-size: 1.55em;
  }

  .game-summary strong {
    font-size: 1.1em;
  }

  .game-summary-score {
    font-size: 1.5em;
  }

  .visual-root > .vv-svg {
    width: 96%;
    height: 96%;
  }

  html[data-reader-large="true"] .sequence-button {
    display: none;
  }

  .visual-root {
    border-radius: 9px;
  }

  .visual-caption {
    margin-top: 2px;
    font-size: .63em;
  }

  .gallery-shell {
    grid-template-columns: 36px minmax(0, 1fr) 36px;
    gap: 3px;
  }

  .gallery-button {
    width: 34px;
    min-width: 34px;
    height: 34px;
  }

  .download-button {
    min-height: 27px;
    padding: 3px 8px;
    font-size: .68em;
  }

  .bottom-nav {
    grid-template-columns: 88px minmax(0, 1fr) 98px;
    gap: 6px;
    padding: 4px 6px;
  }

  .nav-button {
    min-height: 38px;
    padding: 4px 8px;
    font-size: .75em;
  }

  .progress-copy {
    gap: 3px;
    font-size: .66em;
  }
}

@media (max-height: 700px) and (min-width: 651px) {
  .app-shell {
    grid-template-rows: 48px 42px minmax(0, 1fr) 52px;
  }

  .topbar {
    padding-block: 4px;
  }

  .brand-mark {
    width: 35px;
    height: 35px;
  }

  .stepper {
    padding-block: 4px;
  }

  .step-button {
    min-height: 32px;
  }

  .lesson {
    padding-block: 6px;
  }

  .lesson-copy {
    padding-block: 12px;
  }

  .lesson-intro {
    margin-block: 6px 8px;
  }

  .fact,
  .state-row {
    padding-block: 5px;
  }

  .bottom-nav {
    padding-block: 4px;
  }

  .nav-button {
    min-height: 40px;
  }
}

@media (max-width: 650px) and (max-height: 700px) {
  body.screen-safety .lesson {
    grid-template-rows: minmax(205px, 42%) minmax(0, 1fr);
  }

  body.screen-games .lesson {
    grid-template-rows: minmax(185px, 38%) minmax(0, 1fr);
  }
}

/* =====================================================================
   INTÉGRATION AU PACK — bouton de partage et lisibilité agrandie
   ---------------------------------------------------------------------
   Le réglage de la taille du texte n'est plus local à ce module : il est
   porté par `moteur/lisibilite.js` (bouton flottant « Aa », mémorisé et
   partagé avec toutes les pages du pack, avec bascule vers la police
   Lexend pour les lecteurs DYS). Ce moteur agit par `zoom` sur la racine
   et pose `html.lisibilite-agrandie` dès que l'on dépasse 100 %.

   L'écran de ce cours est calibré pour tenir SANS défilement à 100 %.
   Au-delà, la lisibilité passe avant la mise en page : la page défile,
   les deux colonnes s'empilent, et rien n'est coupé — sans ces règles,
   `overflow: hidden` mangerait le bas de l'écran en silence.
   ===================================================================== */
.share-button {
  padding-inline: 12px;
  white-space: nowrap;
}

/* `visible` et non `auto` : un `overflow` non visible sur <body> en ferait un
   conteneur de défilement pour ses descendants — et le sélecteur d'étapes
   collerait alors à un bloc qui, lui, ne défile pas. Piège mesuré, pas supposé. */
html.lisibilite-agrandie,
html.lisibilite-agrandie body {
  height: auto;
  overflow: visible;
}

/* Le passage en flux normal n'est pas cosmétique : dans la grille à quatre
   rangées, la rangée du sélecteur d'étapes est exactement à sa hauteur, donc
   `position: sticky` n'a aucun débattement et l'élément défile quand même.
   En bloc, il colle vraiment — la navigation reste sous la main. */
html.lisibilite-agrandie .app-shell {
  display: block;
  height: auto;
  min-height: 100dvh;
  overflow: visible;
}

html.lisibilite-agrandie .stepper {
  position: sticky;
  top: 0;
  z-index: 6;
}

html.lisibilite-agrandie .lesson {
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto auto;
  overflow: visible;
}

html.lisibilite-agrandie .lesson-copy,
html.lisibilite-agrandie .visual-card,
html.lisibilite-agrandie .lesson-detail,
html.lisibilite-agrandie .visual-root {
  min-height: 0;
  overflow: visible;
}

/* Le livret n'existe qu'à l'impression : à l'écran il ne doit ni s'afficher,
   ni être lu par une synthèse vocale, ni capter le focus. */
.print-book {
  display: none;
}

/* =====================================================================
   LE SOMMAIRE — l'adresse nue ouvre ici
   ---------------------------------------------------------------------
   Demande de F. Henninot (02/08) : « un index au lieu de quatre adresses ».
   Une seule adresse à partager, on choisit son écran dedans. Les adresses
   par écran (`?ecran=geste`) restent valides et sautent ce sommaire — elles
   servent à répondre à une question précise, plus à entrer dans le cours.
   ===================================================================== */
.home {
  display: none;
  min-height: 0;
  flex-direction: column;
  gap: clamp(10px, 1.8vh, 18px);
  padding: clamp(14px, 3vh, 30px) clamp(14px, 4vw, 48px);
  overflow: auto;
}

body.screen-home .home {
  display: flex;
}

body.screen-home .stepper,
body.screen-home .lesson,
body.screen-home .bottom-nav,
body.screen-home #copy-link {
  display: none;
}

.home-copy h1 {
  margin: 4px 0 0;
  color: var(--navy-700);
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  font-size: clamp(1.7em, 4.2vw, 2.6em);
  line-height: 1.05;
  letter-spacing: -.015em;
}

.home-intro {
  margin: 10px 0 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: clamp(.92em, 1.25vw, 1.05em);
  line-height: 1.45;
}

.home-intro strong,
.home-note strong {
  color: var(--navy-700);
}

.home-danger {
  margin: 12px 0 0;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-left: 5px dashed var(--danger);
  border-radius: 10px;
  background: var(--paper);
  font-size: .92em;
  line-height: 1.35;
}

.home-danger strong {
  color: var(--danger);
}

.home-grid {
  display: grid;
  gap: clamp(8px, 1.4vw, 14px);
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
}

.home-tile {
  display: grid;
  align-content: start;
  gap: 5px;
  padding: clamp(11px, 1.6vw, 17px);
  border: 1px solid var(--line);
  border-top: 5px solid var(--navy-700);
  border-radius: 14px;
  background: var(--paper);
  box-shadow: 0 2px 10px rgba(27, 58, 99, .10);
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.home-tile:hover {
  border-top-color: var(--orange);
  box-shadow: 0 6px 18px rgba(27, 58, 99, .16);
}

.home-tile-num {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 2px solid var(--navy-700);
  border-radius: 50%;
  color: var(--navy-700);
  font-family: Consolas, monospace;
  font-size: .85em;
  font-weight: 900;
}

.home-tile strong {
  color: var(--navy-700);
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  font-size: 1.08em;
  line-height: 1.12;
}

.home-tile small {
  color: var(--muted);
  font-size: .82em;
  line-height: 1.3;
}

.home-note {
  margin: 0;
  color: var(--muted);
  font-size: .82em;
  line-height: 1.35;
}

/* Le sommaire respire déjà : il n'a pas besoin du traitement « agrandi ». */
html.lisibilite-agrandie .home {
  overflow: visible;
}

/* La coquille est une grille à quatre rangées calibrées pour le cours ; au
   sommaire, seules l'en-tête et la page d'accueil restent — sans cette règle,
   la section tomberait dans une rangée implicite et flotterait. */
body.screen-home .app-shell {
  grid-template-rows: 58px minmax(0, 1fr);
}

/* Le rendu 3D du sommaire — reconnaître l'objet avant de l'ouvrir en coupe.
   Deux colonnes tant qu'il y a la place, une seule sur téléphone : l'image
   passe alors sous le texte, avant les tuiles. */
.home-top {
  display: grid;
  gap: clamp(12px, 2vw, 26px);
  grid-template-columns: minmax(0, 1.2fr) minmax(200px, .8fr);
  align-items: center;
}

.home-visual {
  margin: 0;
  padding: clamp(8px, 1.2vw, 14px);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
  box-shadow: 0 2px 10px rgba(27, 58, 99, .10);
}

.home-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 26vh;
  object-fit: contain;
}

.home-visual figcaption {
  margin-top: 6px;
  color: var(--muted);
  font-size: .78em;
  line-height: 1.3;
  text-align: center;
}

@media (max-width: 760px) {
  .home-top {
    grid-template-columns: minmax(0, 1fr);
  }

  .home-visual img {
    max-height: 22vh;
  }
}