:root {
  --navy: #1b3a63;
  --blue: #3d7fca;
  --blue-soft: #84b7ec;
  --orange: #ff6b35;
  --orange-deep: #c9451a;
  --cream: #f7f1e7;
  --paper: #fffdf8;
  --ink: #10233c;
  --muted: #637285;
  --line: rgba(27, 58, 99, .16);
  --ok: #1e7e54;
  --ok-bg: #e3f5ec;
  --bad: #c0392b;
  --bad-bg: #fbe7e4;
  --wait: #b06a00;
  --wait-bg: #fff4e0;
  --shadow: 0 18px 48px rgba(27, 58, 99, .14);
  --radius: 18px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

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

body {
  background: var(--cream);
  color: var(--ink);
  font-family: Calibri, "Segoe UI", system-ui, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

button, input { font: inherit; }

button { touch-action: manipulation; }

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(255, 107, 53, .52);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--paper);
  color: var(--navy);
  font-weight: 700;
}

.skip-link:focus { top: 10px; }

.appbar {
  height: 52px;
  padding: 6px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  color: var(--navy);
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
}

.brand-mark {
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--navy);
  color: white;
  font: 700 18px/1 "Trebuchet MS", Calibri, Arial, sans-serif;
  box-shadow: inset -4px -4px 0 var(--orange);
}

.brand strong,
.brand small { display: block; }

.brand strong {
  font: 700 15px/1.05 "Trebuchet MS", Calibri, Arial, sans-serif;
}

.brand small { color: var(--muted); font-size: 11px; margin-top: 2px; }

.appbar-actions { display: flex; align-items: center; gap: 8px; }

.mode-badge,
.small-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 11px;
  background: var(--paper);
  color: var(--navy);
  font-size: 12px;
  font-weight: 700;
}

.small-button { cursor: pointer; }
.small-button:hover { border-color: var(--orange); }
.exit-button { background: var(--navy); color: white; }

.home {
  height: calc(100dvh - 52px);
  overflow: hidden;
  width: min(1180px, calc(100% - 28px));
  margin-inline: auto;
  padding: clamp(14px, 2.5vh, 30px) 0 12px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  grid-template-rows: minmax(0, 1fr) auto auto;
  column-gap: clamp(22px, 4vw, 58px);
  row-gap: clamp(9px, 1.6vh, 18px);
  align-items: center;
}

.home-copy { align-self: center; }

.eyebrow {
  margin: 0 0 7px;
  color: var(--orange-deep);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1, h2, h3 {
  color: var(--navy);
  font-family: "Trebuchet MS", Calibri, Arial, sans-serif;
  text-align: left;
}

.home h1 {
  margin: 0;
  font-size: clamp(42px, 6.2vw, 76px);
  line-height: .96;
  letter-spacing: -.015em;
}

.home h1 span { color: var(--orange-deep); }

.home-intro {
  max-width: 620px;
  margin: 16px 0;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.5;
}

.home-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.home-actions > span { color: var(--muted); font-size: 13px; font-weight: 700; }

.primary-button,
.nav-button {
  min-height: 42px;
  border: 2px solid var(--navy);
  border-radius: 999px;
  padding: 9px 17px;
  background: var(--navy);
  color: white;
  cursor: pointer;
  font-weight: 800;
}

.primary-button:hover,
.nav-button:hover { transform: translateY(-1px); }

.home-visual {
  min-height: 0;
  height: min(39vh, 335px);
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--paper);
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}

.home-visual img { width: 100%; height: 100%; object-fit: cover; display: block; }

.home-visual figcaption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  border-radius: 999px;
  padding: 6px 10px;
  background: var(--navy);
  color: white;
  font-size: 11px;
  font-weight: 700;
}

.dossier-grid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 9px;
}

.dossier-card {
  min-height: 80px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--navy);
  border-radius: 14px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  box-shadow: 0 2px 10px rgba(27, 58, 99, .08);
}

.dossier-card:hover { border-top-color: var(--orange); transform: translateY(-2px); }
.dossier-card b { display: block; color: var(--navy); font-family: "Trebuchet MS", Calibri, Arial, sans-serif; }
.dossier-card span { display: block; margin-top: 3px; color: var(--muted); font-size: 12px; line-height: 1.25; }

.home-note {
  grid-column: 1 / -1;
  margin: 0;
  padding: 8px 12px;
  border-left: 4px dashed var(--orange-deep);
  color: var(--muted);
  font-size: 12px;
}

body.course-running,
body.summary-running { height: 100dvh; overflow: hidden; }

.course-shell {
  height: calc(100dvh - 52px);
  padding: 10px;
  display: grid;
  grid-template-columns: 164px minmax(0, 1fr);
  gap: 10px;
}

.course-rail,
.lesson-card {
  min-width: 0;
  min-height: 0;
  border: 1px solid var(--line);
  background: var(--paper);
}

.course-rail {
  border-radius: 16px;
  padding: 13px 10px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  gap: 9px;
}

.rail-heading { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.rail-heading span { color: var(--orange-deep); font-size: 10px; font-weight: 800; letter-spacing: .12em; }
.rail-heading strong { color: var(--navy); font: 700 13px/1 Consolas, monospace; }

.stepper { display: grid; align-content: center; gap: 7px; }

.step-button {
  width: 100%;
  min-height: 44px;
  padding: 7px 8px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  color: var(--muted);
  cursor: pointer;
  text-align: left;
}

.step-button b { display: block; color: inherit; font-size: 12px; }
.step-button small { display: block; margin-top: 1px; font-size: 10px; }
.step-button.active { border-left-color: var(--orange); color: var(--navy); background: #fff8ed; }
.step-button.done { border-left: 5px double var(--ok); color: var(--ok); }

.progress-track { height: 7px; overflow: hidden; border-radius: 999px; background: #e8e0d4; }
.progress-track span { display: block; width: 0; height: 100%; background: var(--blue); transition: width .2s ease; }
.course-rail > p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.25; }

.lesson-card {
  height: 100%;
  border-radius: 22px;
  box-shadow: var(--shadow);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  position: relative;
}

.lesson-header {
  padding: 12px 16px 8px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.lesson-heading { min-width: 0; }
.lesson-heading .eyebrow { margin-bottom: 2px; }
.lesson-heading h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 39px);
  line-height: 1.02;
  letter-spacing: -.015em;
}

.lesson-tools { display: flex; justify-content: flex-end; align-items: center; flex-wrap: wrap; gap: 6px; }

.tool-button,
.speed-control button {
  min-height: 35px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--navy);
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
}

.tool-button { padding: 6px 10px; }
.tool-button:hover, .speed-control button:hover { border-color: var(--orange); }
.tool-button:disabled { cursor: not-allowed; opacity: .45; }
.voice-button[aria-pressed="true"] { background: var(--navy); color: white; }

.speed-control {
  height: 35px;
  display: inline-grid;
  grid-template-columns: 31px 44px 31px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.speed-control button { min-height: 31px; border: 0; padding: 0; font-size: 17px; }
.speed-control span { text-align: center; color: var(--navy); font: 700 11px/1 Consolas, monospace; }

.lesson-content {
  min-height: 0;
  padding: 10px 14px;
  display: grid;
  grid-template-columns: minmax(220px, .68fr) minmax(0, 1.55fr);
  gap: 12px;
}

.lesson-copy {
  min-height: 0;
  padding: 12px 14px;
  border-left: 4px solid var(--orange);
  border-radius: 10px;
  background: #fff9ef;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.lesson-copy p { margin: 0; }
#lesson-text { font-size: clamp(14px, 1.45vw, 18px); line-height: 1.48; }
.action-prompt { margin-top: 12px !important; color: var(--navy); font-weight: 800; font-size: 13px; }

.activity-zone {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  position: relative;
}

.activity-inner {
  width: 100%;
  height: 100%;
  min-height: 0;
  padding: 12px;
  display: grid;
  align-content: center;
  gap: 10px;
}

.activity-inner h3 { margin: 0; font-size: clamp(17px, 2vw, 23px); }
.activity-inner p { margin: 0; }

.lesson-footer {
  min-height: 48px;
  padding: 6px 14px 8px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
}

.nav-button { min-height: 37px; padding: 6px 13px; font-size: 13px; }
.nav-button.secondary { background: var(--paper); color: var(--navy); }
.nav-button:disabled { opacity: .38; cursor: not-allowed; transform: none; }

.reference-box { color: var(--muted); text-align: center; font-size: 10px; }
.reference-box b { color: var(--navy); }
.code-pill {
  display: inline-block;
  margin: 1px 2px;
  padding: 2px 6px;
  border: 1px solid var(--navy);
  border-radius: 999px;
  color: var(--navy);
  background: var(--paper);
  font: 700 10px/1.2 Consolas, monospace;
}

.status-message {
  position: absolute;
  right: 14px;
  bottom: 53px;
  max-width: min(460px, calc(100% - 28px));
  margin: 0;
  padding: 7px 10px;
  border: 2px solid var(--navy);
  border-radius: 10px;
  background: var(--paper);
  color: var(--navy);
  box-shadow: 0 3px 12px rgba(27, 58, 99, .18);
  font-size: 12px;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity .15s ease, transform .15s ease;
}

.status-message.show { opacity: 1; transform: translateY(0); }

/* Composants pédagogiques */
.hero-statement,
.state-box,
.source-note {
  border: 2px solid var(--navy);
  border-radius: 14px;
  padding: 12px;
  background: var(--paper);
}

.hero-statement { text-align: center; }
.hero-statement strong { display: block; color: var(--navy); font: 700 clamp(24px, 4vw, 48px)/1 "Trebuchet MS", Calibri, Arial, sans-serif; }
.hero-statement span { display: block; margin-top: 6px; color: var(--muted); }

.cross-placement {
  height: min(42vh, 310px);
  min-height: 220px;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(var(--line), var(--line)) center/3px 74% no-repeat,
              linear-gradient(90deg, var(--line), var(--line)) center/74% 3px no-repeat;
}

.cross-label {
  position: absolute;
  min-width: 92px;
  padding: 7px 9px;
  border: 2px solid var(--navy);
  border-radius: 10px;
  background: var(--paper);
  color: var(--navy);
  text-align: center;
  font-size: 12px;
  font-weight: 800;
}

.cross-label.top { left: 50%; top: 8%; transform: translateX(-50%); }
.cross-label.right { right: 4%; top: 50%; transform: translateY(-50%); }
.cross-label.left { left: 4%; top: 50%; transform: translateY(-50%); }
.cross-label.bottom { left: 50%; bottom: 5%; transform: translateX(-50%); border: 5px double var(--ok); color: var(--ok); }
.cross-symbol { position: absolute; left: 50%; bottom: 18%; width: 86px; transform: translateX(-50%); }

.photo-layout { grid-template-columns: minmax(0, 1.5fr) minmax(180px, .8fr); align-items: stretch; }
.equipment-photo { margin: 0; min-height: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; }
.equipment-photo img { width: 100%; height: 100%; min-height: 210px; object-fit: cover; display: block; }
.equipment-photo figcaption { padding: 5px 8px; color: var(--muted); font-size: 10px; }
.feature-list { display: grid; gap: 7px; align-content: center; }
.feature-list span { padding: 8px 10px; border-left: 4px solid var(--blue); border-radius: 8px; background: #f3f7fb; font-weight: 700; font-size: 13px; }

.simulator-grid { grid-template-columns: minmax(0, 1.15fr) minmax(190px, .85fr); align-items: center; }
.coil-stage {
  min-height: 220px;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  position: relative;
  background: #eaf5fb;
}

.coil {
  position: absolute;
  inset: 18% 16% 18% 22%;
  border: 7px solid #506477;
  border-radius: 12px;
  background: repeating-linear-gradient(90deg, #6d8296 0 3px, #d9e2e8 3px 9px);
  box-shadow: inset 0 0 0 4px #f3f7fb;
}

.coil::before,
.coil::after {
  content: "";
  position: absolute;
  left: -28px;
  right: -28px;
  height: 8px;
  border: 3px solid #506477;
  border-left: 0;
  border-right: 0;
}

.coil::before { top: 28%; }
.coil::after { bottom: 28%; }

.frost-layer {
  position: absolute;
  inset: -8px;
  border: calc(2px + var(--frost, 0) * 1px) solid rgba(255,255,255,.95);
  border-radius: 15px;
  box-shadow: 0 0 calc(var(--frost, 0) * 4px) rgba(132,183,236,.95), inset 0 0 16px rgba(255,255,255,.88);
  opacity: calc(.12 + var(--frost, 0) * .2);
}

.airflow { position: absolute; left: 4%; top: 24%; bottom: 24%; width: 15%; display: grid; align-content: space-around; }
.airflow span { height: 4px; border-radius: 999px; background: var(--blue); position: relative; transform: scaleX(var(--air, 1)); transform-origin: right; }
.airflow span::after { content: ""; position: absolute; right: -2px; top: -3px; border: 5px solid transparent; border-left-color: var(--blue); }
.coil-caption { position: absolute; right: 8px; bottom: 7px; border-radius: 999px; padding: 4px 7px; background: var(--navy); color: white; font-size: 10px; font-weight: 700; }

.control-stack { display: grid; gap: 10px; }
.control-stack label { color: var(--navy); font-weight: 800; font-size: 13px; }
.control-stack input[type="range"] { width: 100%; accent-color: var(--blue); }
.scale-row { display: flex; justify-content: space-between; color: var(--muted); font-size: 10px; }
.reading-value { color: var(--navy); font: 700 clamp(24px, 4vw, 42px)/1 Consolas, monospace; }
.qualifier { color: var(--muted); font-size: 12px; }

.state-box { font-size: 13px; }
.state-box b { display: block; margin-bottom: 3px; }
.state-box.correct { border: 5px double var(--ok); color: var(--ok); background: var(--ok-bg); }
.state-box.error { border: 4px dashed var(--bad); color: var(--bad); background: var(--bad-bg); }
.state-box.pending { border: 4px dotted var(--wait); color: #7b4a00; background: var(--wait-bg); }
.state-box.neutral { border: 2px solid var(--navy); color: var(--navy); }

.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.choice-button {
  min-height: 54px;
  padding: 9px 11px;
  border: 2px solid var(--line);
  border-radius: 11px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  font-size: 13px;
  font-weight: 700;
}
.choice-button:hover { border-color: var(--blue); }
.choice-button.correct { border: 5px double var(--ok); color: var(--ok); background: var(--ok-bg); }
.choice-button.wrong { border: 4px dashed var(--bad); color: var(--bad); background: var(--bad-bg); }
.choice-button:disabled { cursor: default; }

.method-tabs,
.segmented { display: flex; flex-wrap: wrap; gap: 7px; }
.method-tabs button,
.segmented button {
  min-height: 38px;
  padding: 7px 11px;
  border: 2px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--navy);
  cursor: pointer;
  font-weight: 800;
  font-size: 12px;
}
.method-tabs button[aria-pressed="true"],
.segmented button[aria-pressed="true"] { border-color: var(--blue); background: #eef6ff; }
.method-copy { min-height: 90px; padding: 11px; border-left: 4px solid var(--blue); border-radius: 9px; background: #f3f7fb; }
.method-copy b { display: block; color: var(--navy); }

.inspection-grid,
.role-grid,
.report-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.inspection-item,
.role-card,
.report-item {
  min-height: 72px;
  padding: 9px;
  border: 2px solid var(--line);
  border-radius: 11px;
  background: var(--paper);
  color: var(--ink);
  text-align: left;
}
.inspection-item,
.report-item { cursor: pointer; }
.inspection-item[aria-pressed="true"],
.report-item[aria-pressed="true"] { border: 5px double var(--ok); background: var(--ok-bg); }
.inspection-item b,
.role-card b,
.report-item b { display: block; color: var(--navy); }
.inspection-item span,
.role-card span,
.report-item span { display: block; margin-top: 2px; color: var(--muted); font-size: 11px; line-height: 1.25; }
.role-card.regulator { border-left: 5px solid var(--blue); }
.role-card.switch { border-left: 5px dashed var(--orange-deep); }

.timer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
.timer-control { padding: 10px; border: 1px solid var(--line); border-radius: 12px; }
.timer-control > b { display: block; margin-bottom: 7px; color: var(--navy); }
.timer-result { grid-column: 1 / -1; }

.sequence-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 7px; }
.sequence-button { min-height: 70px; border: 2px solid var(--line); border-radius: 11px; background: var(--paper); color: var(--ink); cursor: pointer; font-weight: 700; }
.sequence-button.selected { border-color: var(--blue); background: #eef6ff; }
.sequence-button b { display: block; color: var(--navy); font: 700 20px/1 Consolas, monospace; }

.equipment-inspection { grid-template-columns: minmax(0, 1.4fr) minmax(200px, .8fr); }
.hotspot-photo { position: relative; min-height: 240px; overflow: hidden; border-radius: 14px; border: 1px solid var(--line); }
.hotspot-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.hotspot {
  position: absolute;
  width: 34px;
  height: 34px;
  border: 3px solid var(--orange);
  border-radius: 50%;
  background: var(--paper);
  color: var(--navy);
  cursor: pointer;
  font-weight: 800;
}
.hotspot.active { border: 5px double var(--ok); background: var(--ok-bg); color: var(--ok); }
.hotspot[data-hotspot="battery"] { left: 16%; top: 33%; }
.hotspot[data-hotspot="fans"] { right: 24%; top: 38%; }
.hotspot[data-hotspot="tray"] { left: 48%; bottom: 9%; }
.hotspot-copy { display: grid; align-content: center; gap: 8px; }

.report-output {
  min-height: 84px;
  padding: 10px;
  border: 2px solid var(--navy);
  border-radius: 11px;
  background: var(--paper);
  color: var(--ink);
  font-size: 12px;
}
.report-output b { color: var(--navy); }

.quiz-wrap { display: grid; align-content: center; gap: 9px; }
.quiz-question { color: var(--navy); font: 700 clamp(17px, 2.2vw, 24px)/1.2 "Trebuchet MS", Calibri, Arial, sans-serif; }
.quiz-feedback { min-height: 52px; }

.score-panel { text-align: center; }
.score-value { display: block; color: var(--navy); font: 700 clamp(44px, 8vw, 92px)/.95 Consolas, monospace; }
.score-panel h3 { text-align: center; margin: 4px 0; }
.score-panel p { max-width: 640px; margin: 6px auto; }
.score-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

.source-note { border-style: dotted; color: var(--muted); font-size: 11px; }
.symbol-row { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 14px; }
.symbol-card { width: min(160px, 30%); padding: 9px; border: 1px solid var(--line); border-radius: 12px; text-align: center; }
.symbol-card img { width: 74px; height: 74px; object-fit: contain; }
.symbol-card b { display: block; color: var(--navy); font-size: 12px; }

.print-book { display: none; }

@media (max-width: 1050px) {
  .lesson-content { grid-template-columns: minmax(210px, .62fr) minmax(0, 1.38fr); }
  .tool-button { padding-inline: 8px; }
  .lesson-tools { max-width: 430px; }
  .home h1 { font-size: clamp(38px, 6vw, 62px); }
}

@media (max-width: 760px) {
  .appbar { height: 42px; padding: 4px 7px; }
  .brand-mark { width: 30px; height: 30px; font-size: 15px; }
  .brand strong { font-size: 12px; }
  .brand small { display: none; }
  .mode-badge { display: none; }
  .small-button { min-height: 31px; padding: 4px 8px; font-size: 10px; }

  .home {
    height: calc(100dvh - 42px);
    width: calc(100% - 10px);
    padding-top: 7px;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    gap: 7px;
    align-content: center;
  }

  .home-copy { text-align: left; }
  .home .eyebrow { font-size: 9px; }
  .home h1 { font-size: clamp(30px, 10vw, 44px); }
  .home-intro { margin: 8px 0; font-size: 13px; line-height: 1.32; }
  .home-actions { gap: 7px; }
  .primary-button { min-height: 36px; padding: 6px 12px; font-size: 12px; }
  .home-actions > span { font-size: 10px; }
  .home-visual { display: none; }
  .dossier-grid { grid-template-columns: 1fr; gap: 5px; }
  .dossier-card { min-height: 0; padding: 6px 9px; border-top-width: 1px; border-left: 4px solid var(--navy); }
  .dossier-card b { font-size: 12px; }
  .dossier-card span { font-size: 10px; }
  .home-note { padding: 5px 8px; font-size: 9px; line-height: 1.25; }

  .course-shell {
    height: calc(100dvh - 42px);
    padding: 4px;
    grid-template-columns: 1fr;
    grid-template-rows: 38px minmax(0, 1fr);
    gap: 4px;
  }

  .course-rail {
    border-radius: 10px;
    padding: 3px 5px;
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-rows: 1fr;
    align-items: center;
    gap: 5px;
  }

  .rail-heading { display: block; }
  .rail-heading span { display: none; }
  .rail-heading strong { font-size: 10px; }
  .stepper { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); align-content: stretch; gap: 3px; }
  .step-button { min-height: 28px; padding: 3px 2px; border-left-width: 1px; text-align: center; }
  .step-button.active { border-left-width: 1px; border-bottom: 4px solid var(--orange); }
  .step-button.done { border-left-width: 1px; border-bottom: 4px double var(--ok); }
  .step-button b { font-size: 8px; }
  .step-button small { display: none; }
  .progress-track { width: 32px; height: 5px; }
  .course-rail > p { display: none; }

  .lesson-card { border-radius: 13px; grid-template-rows: auto minmax(0, 1fr) auto; }
  .lesson-header { min-height: 53px; padding: 5px 7px; align-items: center; gap: 5px; }
  .lesson-heading .eyebrow { font-size: 8px; letter-spacing: .08em; }
  .lesson-heading h2 { font-size: clamp(17px, 5.6vw, 23px); line-height: 1; }
  .lesson-tools { flex-wrap: nowrap; gap: 3px; }
  .tool-button { min-height: 30px; width: 31px; padding: 3px; overflow: hidden; white-space: nowrap; font-size: 0; }
  .tool-button > span[aria-hidden="true"] { font-size: 13px; }
  .tool-button .tool-label { display: none; }
  .voice-button span:first-child { font-size: 13px; }
  .voice-button span:last-child { display: none; }
  .speed-control { display: none; }

  .lesson-content {
    padding: 4px 6px;
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr);
    gap: 4px;
  }

  .lesson-copy { padding: 5px 7px; border-left-width: 3px; justify-content: flex-start; }
  #lesson-text { font-size: 12px; line-height: 1.22; }
  .action-prompt { margin-top: 3px !important; font-size: 10px; line-height: 1.15; }
  .activity-zone { border-radius: 10px; }
  .activity-inner { padding: 5px; gap: 5px; }
  .activity-inner h3 { font-size: 14px; }
  .activity-inner p { font-size: 10px; line-height: 1.2; }

  .lesson-footer { min-height: 39px; padding: 3px 5px; gap: 4px; }
  .nav-button { min-height: 31px; padding: 4px 8px; font-size: 10px; }
  .reference-box { font-size: 8px; line-height: 1.1; }
  .code-pill { font-size: 8px; padding: 1px 3px; }
  .status-message { right: 5px; bottom: 42px; font-size: 9px; padding: 4px 6px; }

  .hero-statement { padding: 6px; }
  .hero-statement strong { font-size: clamp(20px, 8vw, 32px); }
  .hero-statement span { font-size: 9px; }
  .cross-placement { height: 100%; min-height: 150px; }
  .cross-label { min-width: 70px; padding: 4px 5px; font-size: 9px; }
  .cross-symbol { width: 56px; bottom: 18%; }
  .photo-layout,
  .simulator-grid,
  .equipment-inspection { grid-template-columns: 1.25fr .75fr; }
  .equipment-photo img { min-height: 120px; }
  .equipment-photo figcaption { display: none; }
  .feature-list { gap: 3px; }
  .feature-list span { padding: 4px 5px; font-size: 9px; }
  .coil-stage { min-height: 130px; }
  .control-stack { gap: 5px; }
  .control-stack label { font-size: 9px; }
  .reading-value { font-size: 24px; }
  .qualifier, .state-box { font-size: 9px; line-height: 1.16; }
  .state-box { padding: 5px; }
  .choice-grid { gap: 4px; }
  .choice-button { min-height: 38px; padding: 5px 6px; font-size: 9px; line-height: 1.13; }
  .method-tabs, .segmented { gap: 3px; }
  .method-tabs button, .segmented button { min-height: 29px; padding: 3px 7px; font-size: 9px; }
  .method-copy { min-height: 54px; padding: 5px; font-size: 9px; }
  .inspection-grid, .role-grid, .report-grid { gap: 4px; }
  .inspection-item, .role-card, .report-item { min-height: 49px; padding: 5px; font-size: 9px; }
  .inspection-item span, .role-card span, .report-item span { font-size: 8px; }
  .timer-control { padding: 5px; }
  .timer-control > b { margin-bottom: 3px; font-size: 9px; }
  .sequence-row { gap: 3px; }
  .sequence-button { min-height: 48px; font-size: 8px; }
  .sequence-button b { font-size: 14px; }
  .hotspot-photo { min-height: 130px; }
  .hotspot { width: 27px; height: 27px; font-size: 10px; }
  .report-output { min-height: 54px; padding: 5px; font-size: 9px; }
  .quiz-question { font-size: 13px; }
  .quiz-feedback { min-height: 36px; }
  .score-value { font-size: 45px; }
  .score-panel p { font-size: 9px; }
  .score-actions { margin-top: 5px; }
  .symbol-row { gap: 5px; }
  .symbol-card { padding: 4px; }
  .symbol-card img { width: 42px; height: 42px; }
  .symbol-card b { font-size: 8px; }
  .source-note { padding: 4px; font-size: 8px; }
}

@media (max-width: 380px) and (max-height: 680px) {
  .home-intro { font-size: 12px; }
  .dossier-card span { display: none; }
  .home-note { font-size: 8px; }
  .lesson-copy { padding-block: 4px; }
  #lesson-text { font-size: 11px; }
  .action-prompt { font-size: 9px; }
}

@media (prefers-reduced-motion: reduce) {
  button,
  .progress-track span,
  .status-message { transition: none; }
  button:hover { transform: none; }
}