/*
 * AZ-700 Study Buddy — component styles.
 *
 * Colours, spacing, radii and type sizes come from tokens.css; this file never
 * uses a raw colour except the translucent white overlays on surfaces that are
 * dark in both themes (sidebar, hero banners), written as
 * rgb(var(--rgb-on-dark) / alpha).
 *
 * Sections: base · sidebar · main/topbar · buttons · dashboard · chapter
 * header and activity bar · lesson layout · topic viewer · quiz · practice
 * setup · labs · responsive · scenario navigation · collapsible sidebar ·
 * design-system refinements (focus, badges, code blocks, flashcards, quiz
 * states) · theme and icon controls.
 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
}

.app-shell {
  min-height: 100vh;
}

/* ── SIDEBAR ─────────────────────────────────────────────── */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  width: 320px;
  min-width: 320px;
  height: 100vh;
  overflow-y: auto;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  transition: transform 0.25s ease;
}

.brand {
  padding: 24px 20px 16px;
  border-bottom: 1px solid rgb(var(--rgb-on-dark) / 0.08);
}

.brand-mark {
  display: inline-block;
  padding: 3px 10px;
  margin-bottom: 10px;
  border-radius: 2px;
  background: var(--color-action-fill);
  color: var(--color-on-fill);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand p {
  color: var(--color-on-fill);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.3;
}

.brand span {
  display: block;
  margin-top: 4px;
  color: var(--sidebar-text);
  font-size: 12px;
}

.search-box {
  display: grid;
  gap: 8px;
  padding: 14px 20px 8px;
  color: var(--sidebar-heading);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.search-box input {
  min-height: 36px;
  width: 100%;
  padding: 8px 10px;
  border: 1px solid rgb(var(--rgb-on-dark) / 0.12);
  border-radius: var(--radius-md);
  outline: none;
  background: rgb(var(--rgb-on-dark) / 0.07);
  color: var(--color-on-fill);
}

.search-box input:focus {
  border-color: var(--color-action);
  box-shadow: 0 0 0 2px rgb(var(--rgb-action) / 0.3);
}

.nav-section {
  padding: 10px 20px 4px;
  color: var(--sidebar-heading);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.module-nav {
  display: block;
  padding: 4px 0 12px;
}

.overview-link,
.review-link,
.module-button {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 44px;
  padding: 10px 20px;
  border: 0;
  border-left: 3px solid transparent;
  border-radius: 0;
  background: transparent;
  color: var(--sidebar-text);
  font-size: 14px;
  text-align: left;
  transition: all 0.2s;
}

.overview-link:hover,
.review-link:hover,
.module-button:hover {
  background: var(--sidebar-hover);
  color: var(--color-on-fill);
}

.overview-link.active,
.review-link.active,
.module-button.active {
  background: var(--sidebar-panel);
  border-left-color: var(--color-action);
  color: var(--color-on-fill);
  font-weight: 600;
}

.nav-icon,
.module-dot {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgb(var(--rgb-on-dark) / 0.1);
  color: var(--color-on-fill);
  font-size: 11px;
  font-weight: 700;
}

.module-button.active .module-dot {
  background: var(--color-action-fill);
}

.module-label {
  min-width: 0;
  flex: 1;
}

.module-name {
  display: block;
  line-height: 1.32;
  overflow-wrap: anywhere;
  font-size: 14px;
  font-weight: 700;
}

.module-count {
  margin-left: auto;
  flex-shrink: 0;
  color: var(--sidebar-muted);
  font-size: 11px;
  font-weight: 700;
}

.nav-ch-arrow {
  flex-shrink: 0;
  width: 14px;
  color: var(--sidebar-muted);
  font-size: 16px;
  text-align: center;
}

.nav-ch-group.open .module-button {
  background: var(--sidebar-panel);
  color: var(--color-on-fill);
}

.nav-ch-sub {
  padding: 4px 0 10px;
  background: rgb(var(--rgb-shadow) / 0.12);
  border-left: 3px solid rgb(var(--rgb-action) / 0.42);
}

.nav-section-link {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 18px 10px 28px;
  border: 0;
  border-left: 3px solid transparent;
  background: transparent;
  color: var(--sidebar-link);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  transition: all 0.2s;
}

.nav-section-link:hover,
.nav-section-link.active {
  background: rgb(var(--rgb-action) / 0.18);
  border-left-color: var(--color-action);
  color: var(--color-on-fill);
}

.nav-section-emoji {
  width: 22px;
  flex-shrink: 0;
  font-size: 16px;
  line-height: 1;
  text-align: center;
}

.curriculum-heading {
  padding-top: 14px;
  color: var(--sidebar-heading);
  line-height: 1.35;
}

.sidebar-actions {
  margin-top: auto;
  padding: 16px 20px 22px;
  border-top: 1px solid rgb(var(--rgb-on-dark) / 0.08);
}

/* ── MAIN / TOPBAR ───────────────────────────────────────── */
.main {
  min-height: 100vh;
  margin-left: 320px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: var(--topbar-height);
  padding: var(--space-3) var(--space-6);
  background: var(--color-topbar);
  border-bottom: 1px solid var(--color-border);
  box-shadow: none;
  backdrop-filter: saturate(1.2) blur(6px);
}

/* Leading cluster: hamburger + page title. Kept together so that when the
   topbar stacks on small screens the toggle stays beside the heading. */
.topbar-lead {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

/* Hidden until a breakpoint turns the sidebar into an off-canvas drawer. */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 20px;
  line-height: 1;
}

.nav-toggle:hover {
  border-color: var(--color-action);
  color: var(--color-action);
}

/* Backdrop behind the open drawer. Inert and invisible until .nav-open. */
.sidebar-scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 90;
  background: var(--color-scrim);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.eyebrow {
  margin-bottom: 3px;
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  color: var(--color-text);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.25;
}

.topbar-heading h1 {
  font-size: var(--text-lg);
  line-height: 1.3;
}

.view-tabs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.tab-button {
  white-space: nowrap;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}

.tab-button:hover {
  border-color: var(--color-action);
  color: var(--color-action);
}

/* Buttons: one size, one radius, consistent states. */
.button,
.tab-button {
  min-height: 40px;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.content {
  margin: 0 auto;
  max-width: var(--content-max);
  padding: var(--space-5) var(--space-6) var(--space-8);
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.button {
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--color-action);
  color: var(--color-action);
}

.button:hover {
  background: var(--color-action-fill);
  color: var(--color-on-fill);
}

.button.primary:hover {
  background: var(--color-action-fill-hover);
  border-color: var(--color-action-strong);
}

.button.ghost:hover {
  background: rgb(var(--rgb-on-dark) / 0.12);
}

.button.full {
  width: 100%;
}

.button.link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.button:disabled {
  cursor: not-allowed;
  border-color: var(--color-border);
  background: var(--color-surface-subtle);
  color: var(--color-text-muted);
  opacity: 1;
}

/* ── DASHBOARD HERO ──────────────────────────────────────── */
.dashboard-hero {
  position: relative;
  overflow: hidden;
  margin-bottom: 24px;
  padding: 36px 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-hero-start) 0%, var(--color-hero-end) 100%);
  color: var(--color-on-fill);
}

.dashboard-hero h2 {
  margin-bottom: 6px;
  font-size: 26px;
  font-weight: 800;
}

.dashboard-hero p {
  max-width: 560px;
  font-size: 15px;
  line-height: 1.6;
  opacity: 0.85;
}

.exam-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 20px;
}

.exam-meta > div {
  padding: 10px 18px;
  border-radius: 8px;
  background: rgb(var(--rgb-on-dark) / 0.15);
}

.exam-meta div .label {
  font-size: 11px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  opacity: 0.75;
}

.exam-meta div .value {
  font-size: 20px;
  font-weight: 700;
}

/* ── RESUME CARD ─────────────────────────────────────────── */
.dashboard-resume-card {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
  padding: 24px 28px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-action-fill) 0%, var(--color-hero-end) 100%);
  color: var(--color-on-fill);
  cursor: pointer;
  box-shadow: 0 4px 20px rgb(var(--rgb-action) / 0.25);
}

.resume-card-icon {
  flex-shrink: 0;
  font-size: 40px;
}

.resume-card-body {
  flex: 1;
}

.resume-card-greeting {
  margin-bottom: 2px;
  font-size: 13px;
  opacity: 0.82;
}

.resume-card-title {
  margin-bottom: 4px;
  font-size: 20px;
  font-weight: 800;
}

.resume-card-sub {
  font-size: 13px;
  opacity: 0.82;
}

.resume-card-btn {
  flex-shrink: 0;
  padding: 10px 22px;
  border: 2px solid rgb(var(--rgb-on-dark) / 0.4);
  border-radius: 100px;
  background: rgb(var(--rgb-on-dark) / 0.18);
  color: var(--color-on-fill);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  transition: background 0.2s;
}

.resume-card-btn:hover {
  background: rgb(var(--rgb-on-dark) / 0.28);
}

/* ── SECTION HEADERS ─────────────────────────────────────── */
.dashboard-section-header {
  margin: 24px 0 10px;
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

/* ── STAT CARDS ──────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 28px;
}

.stats-row.two {
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 0;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  padding: 20px 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  text-align: center;
}

.stat-card .stat-icon {
  margin-bottom: 8px;
  font-size: 28px;
  line-height: 1;
}

.stat-card .stat-val {
  width: 100%;
  color: var(--color-text);
  font-size: 28px;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
}

.stat-card .stat-label {
  width: 100%;
  margin-top: 6px;
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.35;
  text-align: center;
}

/* ── CHAPTER CARDS ───────────────────────────────────────── */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.chapter-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 24px;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  cursor: pointer;
  transition: all 0.2s;
}

.chapter-card:hover {
  border-color: var(--color-action);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgb(var(--rgb-shadow) / 0.12);
}

.ch-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ch-badge {
  flex-shrink: 0;
  padding: 4px 12px;
  border-radius: 4px;
  background: var(--color-action-fill);
  color: var(--color-on-fill);
  font-size: 13px;
  font-weight: 700;
}

.ch-title {
  font-size: 15px;
  font-weight: 700;
}

.ch-desc {
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.5;
}

.ch-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  background: var(--color-canvas);
  color: var(--color-text-muted);
}

.tag.accent {
  background: rgb(var(--rgb-success) / 0.12);
  color: var(--color-success);
}

.tag.primary {
  background: rgb(var(--rgb-action) / 0.1);
  color: var(--color-action-strong);
}

.ch-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.progress-bar-wrap {
  flex: 1;
  height: 6px;
  margin-right: 10px;
  overflow: hidden;
  border-radius: 3px;
  background: var(--color-canvas);
}

.progress-bar {
  height: 100%;
  border-radius: 3px;
  background: var(--color-action-fill);
  transition: width 0.4s;
}

.progress-label {
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 600;
}

/* ── CARDS / PANELS ──────────────────────────────────────── */
.card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.card h3 .icon {
  font-size: 18px;
}

.card p {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.65;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* ── CHAPTER (MODULE) HERO ───────────────────────────────── */
.ch-num-big {
  margin-bottom: 6px;
  color: rgb(var(--rgb-on-dark) / 0.85);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.ch-topic-progress-wrap {
  height: 6px;
  margin-top: 16px;
  overflow: hidden;
  border-radius: 3px;
  background: rgb(var(--rgb-on-dark) / 0.2);
}

.ch-topic-progress-bar {
  height: 100%;
  border-radius: 3px;
  background: rgb(var(--rgb-on-dark) / 0.85);
  transition: width 0.5s;
}

.module-chapter-header {
  justify-content: space-between;
  margin-bottom: 18px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4) var(--space-5);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.module-chapter-header h2 {
  margin: 0 0 6px;
  font-size: var(--text-2xl);
  line-height: 1.25;
}

.module-chapter-header p {
  margin: 0;
  font-size: 14px;
  max-width: var(--reading-max);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.module-chapter-header .ch-num-big {
  display: block;
  margin-bottom: 6px;
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.module-chapter-header .ch-topic-progress-wrap {
  height: 6px;
  margin-top: 12px;
  overflow: hidden;
  border-radius: 3px;
  background: var(--color-surface-subtle);
}

.module-chapter-header .ch-topic-progress-bar {
  background: var(--color-action-fill);
}

.module-chapter-header-actions {
  display: flex;
  flex-wrap: wrap;
  flex-shrink: 1;
  gap: 10px;
}

.module-phase-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: var(--space-5);
  padding: 0;
  border-bottom: 0;
}

.module-phase-steps {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  flex: 1;
  min-width: 0;
  display: flex;
  gap: var(--space-1);
  padding: var(--space-1);
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

@media (max-width: 40rem) {
  .module-phase-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.module-phase-step {
  display: flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  flex: 1 0 9.5rem;
  min-height: 56px;
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-radius: var(--radius-md);
  scroll-snap-align: start;
}

.module-phase-step:hover {
  background: var(--color-surface-subtle);
}

.module-phase-icon {
  font-size: 20px;
  line-height: 1;
}

.module-phase-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.module-phase-label {
  font-weight: 700;
  font-size: var(--text-sm);
}

.module-phase-step.active .module-phase-label {
  color: var(--color-action-strong);
}

.module-phase-sub {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.exam-objectives-panel h3,
.module-section-panel h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.panel-icon {
  font-size: 18px;
}

.exam-domain-line {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 600;
}

.exam-objective-list {
  margin: 0;
  color: var(--color-text);
  display: grid;
  gap: var(--space-2);
  max-width: var(--reading-max);
  padding-left: var(--space-5);
  line-height: 1.6;
}

.section-lead {
  margin: 0 0 16px;
  max-width: var(--reading-max);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.scenario-list {
  display: grid;
  gap: 10px;
}

.scenario-objective {
  display: grid;
  gap: 4px;
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  text-align: left;
  cursor: pointer;
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.scenario-objective:hover {
  border-color: var(--color-action-border);
  background: var(--color-action-subtle);
}

.scenario-objective.active {
  border-color: var(--color-action);
  box-shadow: inset 4px 0 0 var(--color-action);
  background: var(--color-action-subtle);
}

.scenario-lesson {
  color: var(--color-action-strong);
  font-size: 12px;
  font-weight: 700;
}

.scenario-text {
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.45;
}

.labs-list {
  display: grid;
  gap: 12px;
}

.lab-item {
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
}

.lab-lesson {
  display: block;
  margin-bottom: 6px;
  color: var(--color-action);
  font-size: 12px;
  font-weight: 700;
}

.lab-item p {
  margin: 0;
  line-height: 1.55;
}

.flashcard-face {
  font-size: 18px;
  line-height: 1.55;
  text-align: center;
  display: grid;
  gap: var(--space-3);
  justify-items: center;
}

.flashcard:not(.flipped) .flashcard-back,
.flashcard.flipped .flashcard-front {
  display: none;
}

.lesson-sidebar h3 {
  display: flex;
  align-items: center;
}

/* ── MONITOR / BACKUP MIND MAP ───────────────────────────── */
.mind-map-panel {
  display: grid;
  grid-template-columns: minmax(280px, 0.42fr) minmax(0, 0.58fr);
  gap: 22px;
  align-items: stretch;
  margin-bottom: 20px;
  overflow: hidden;
}

.mind-map-copy {
  display: grid;
  align-content: start;
  gap: 12px;
}

.mind-map-copy h3 {
  margin: 0;
  padding: 0 0 10px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 18px;
  font-weight: 800;
}

.mind-map-branches {
  display: grid;
  gap: 8px;
  margin: 2px 0 4px;
  list-style: none;
}

.mind-map-branches li {
  position: relative;
  padding-left: 18px;
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.45;
}

.mind-map-branches li::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-action-fill);
}

.mind-map-image-link {
  display: flex;
  min-height: 300px;
  max-height: 520px;
  overflow: hidden;
  border: 1px solid var(--color-media-border);
  border-radius: var(--radius-md);
  background: var(--color-media-bg);
  text-decoration: none;
}

.mind-map-image-link img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

/* ── MODULE / LESSON LAYOUT ──────────────────────────────── */
.module-shell {
  display: grid;
  gap: 20px;
  align-items: start;
  grid-template-columns: minmax(250px, 0.34fr) minmax(0, 1.66fr);
}

/* Objective-focus mode renders a single panel with no lesson-list aside. The
   default two-column grid would strand that lone panel in the narrow first
   column and leave the wide second column empty, so give it the full width. */
.module-shell.module-shell--single {
  grid-template-columns: minmax(0, 1fr);
}

.module-shell > aside.card {
  position: sticky;
  top: calc(var(--topbar-height) + 12px);
  align-self: start;
  max-height: calc(100vh - var(--topbar-height) - 24px);
  overflow: auto;
}

.card {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
}

.module-shell > aside.card h3 {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.lesson-list {
  display: grid;
  gap: 8px;
}

.lesson-panel {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.lesson-button {
  display: grid;
  gap: 4px;
  width: 100%;
  min-height: 58px;
  padding: 10px 12px;
  border: 1.5px solid var(--color-border);
  border-left: 3px solid transparent;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  text-align: left;
  transition: all 0.15s;
}

.lesson-button:hover {
  border-color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.05);
}

.lesson-button.active {
  border-left-color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.08);
}

.lesson-button.done {
  border-left-color: var(--accent);
}

.lesson-sidebar .lesson-button {
  border-radius: var(--radius-md);
}

.lesson-button span:first-child {
  font-size: 13px;
  font-weight: 600;
}

.lesson-button span:last-child {
  color: var(--color-text-muted);
  font-size: 12px;
}

.lesson-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}

.lesson-header-copy {
  min-width: 0;
  flex: 1 1 100%;
}

.lesson-header h2 {
  margin-bottom: 6px;
  padding-bottom: 0;
  border-bottom: none;
  font-size: 18px;
  font-weight: 800;
}

.lesson-panel h2 {
  margin-bottom: 6px;
  padding-bottom: 10px;
  border-bottom: 2px solid rgb(var(--rgb-action) / 0.2);
  color: var(--color-action);
  font-weight: 800;
}

.objective-focus h2 {
  margin-top: 8px;
}

.objective-card {
  padding: 14px 16px;
  border: 1px solid rgb(var(--rgb-action) / 0.24);
  border-left: 4px solid var(--color-action);
  background: rgb(var(--rgb-action) / 0.06);
  border-radius: var(--radius-md);
}

.objective-card p {
  color: var(--color-text);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.65;
}

.focused-topic .topic-viewer-header {
  margin-bottom: 10px;
}

.lesson-panel > div > p {
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.85;
}

.lesson-actions,
.inline-actions,
.pill-row,
.meta-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.lesson-panel h3 {
  margin-bottom: 8px;
  color: var(--color-text);
  font-size: 13px;
  font-weight: 700;
}

.list {
  list-style: none;
  display: grid;
}

.list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-canvas);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.55;
}

.list li:last-child {
  border-bottom: none;
}

.list li::before {
  content: "▸";
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-action);
  font-size: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 14px;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  background: var(--color-canvas);
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.15s;
}

.pill:hover {
  border-color: var(--color-action);
  color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.06);
}

/* ── TOPIC VIEWER (AI-103 style) ─────────────────────────── */
.topic-viewer {
  display: flex;
  flex-direction: column;
  min-height: min(520px, calc(100vh - 300px));
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  overflow: hidden;
}

.topic-viewer-toolbar {
  flex-shrink: 0;
  padding: 14px 16px 0;
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface-alt) 100%);
}

.topic-viewer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.topic-viewer-header h3 {
  margin: 0;
  padding: 0;
  border: none;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 700;
}

.topic-dots {
  display: flex;
  flex-wrap: nowrap;
  gap: 7px;
  margin: 0 0 6px;
  padding-bottom: 8px;
  overflow-x: auto;
}

/* The button is a 24px target; the visible dot is drawn inside it. */
.topic-dot {
  position: relative;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
}

.topic-dot::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-border-strong);
  transform: translate(-50%, -50%);
  transition: all 0.25s;
}

.topic-dot.seen::before {
  background: var(--accent);
}

.topic-dot.active::before {
  background: var(--color-action-fill);
  transform: translate(-50%, -50%) scale(1.35);
  box-shadow: 0 0 0 3px rgb(var(--rgb-action) / 0.2);
}

.topic-slide {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: 16px 18px 8px;
  animation: fadeIn 0.3s;
}

.topic-slide-body {
  flex: 1;
  min-height: 0;
  max-height: clamp(430px, calc(100vh - 240px), 1100px);
  overflow: auto;
  padding-right: 4px;
}

.topic-learn {
  margin: 18px 0 6px;
  padding: 12px 14px;
  border: 1px solid rgb(var(--rgb-action) / 0.22);
  border-radius: 8px;
  background: rgb(var(--rgb-action) / 0.04);
}

.topic-learn strong {
  display: block;
  margin-bottom: 8px;
  color: var(--color-action-strong);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.topic-learn ul {
  margin: 0;
  padding-left: 18px;
}

.topic-learn li {
  margin-bottom: 6px;
  font-size: 13px;
  line-height: 1.5;
}

.topic-learn a {
  color: var(--color-action-strong);
  font-weight: 600;
  text-decoration: none;
}

.topic-learn a:hover {
  text-decoration: underline;
}

.topic-table-wrap {
  overflow-x: auto;
  margin: 14px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.topic-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  color: var(--color-text);
  font-size: var(--text-xl);
  font-weight: 700;
  border-bottom: 1px solid var(--color-border);
}

.topic-text {
  margin-bottom: 14px;
  color: var(--color-text);
}

.topic-bullets,
.topic-steps {
  margin: 8px 0 14px;
  padding-left: 24px;
  color: var(--color-text);
}

.topic-slide-body .topic-text,
.topic-slide-body .topic-bullets,
.topic-slide-body .topic-steps {
  color: var(--color-text);
  max-width: min(100%, 118ch);
  font-size: clamp(var(--text-md), 0.8rem + 0.2vw, 1.15rem);
  line-height: 1.7;
}

.topic-keybox {
  margin: 16px 0;
  font-size: clamp(0.9375rem, 0.75rem + 0.35vw, 1.2rem);
  line-height: 1.7;
}

.topic-keybox strong {
  display: block;
  margin-bottom: 4px;
  color: var(--color-action-strong);
}

.exam-tip {
  margin: 16px 0;
  color: var(--color-tip-text);
  font-size: clamp(0.9375rem, 0.75rem + 0.35vw, 1.2rem);
  line-height: 1.7;
}

/* Callouts: key points and exam tips. */
.topic-keybox,
.exam-tip {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-action-border-subtle);
  border-left: 4px solid var(--color-action);
  border-radius: var(--radius-md);
  background: var(--color-action-subtle);
}

.exam-tip strong {
  display: block;
  margin-bottom: 4px;
  color: var(--color-tip-strong);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.topic-code-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 16px 0 6px;
}

.topic-code-label {
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.topic-code {
  max-height: 320px;
  white-space: pre-wrap;
}

.topic-table {
  margin: 14px 0;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: var(--shadow-1);
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.topic-table td {
  color: var(--color-text);
  line-height: 1.5;
  border-bottom: 1px solid var(--color-border);
}

.topic-table tr:last-child td {
  border-bottom: none;
}

.topic-table tr:nth-child(even) td {
  background: var(--color-canvas);
}

.topic-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-shrink: 0;
  margin-top: auto;
  padding: 14px 16px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-alt);
}

/* ── DOMAIN BARS ─────────────────────────────────────────── */
.domain-bars {
  display: grid;
  gap: 12px;
}

.domain-row {
  display: grid;
  gap: 6px;
}

.domain-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--color-text);
  font-size: 13px;
  font-weight: 600;
}

.progress-track {
  width: 100%;
  height: 6px;
  overflow: hidden;
  border-radius: 3px;
  background: var(--color-canvas);
}

.progress-fill {
  width: var(--progress);
  height: 100%;
  border-radius: 3px;
  background: var(--accent, var(--color-action-fill));
  transition: width 0.4s;
}

/* ── RESOURCES / SEARCH ──────────────────────────────────── */
.search-results {
  display: grid;
  gap: 12px;
}

.search-result {
  padding: 20px 24px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  transition: border-color 0.2s;
}

.search-result:hover {
  border-color: var(--color-action);
}

.search-result h2 {
  margin-bottom: 6px;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 700;
}

.search-result p {
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.meta-line {
  margin-top: 8px;
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 600;
}

/* ── QUIZ ────────────────────────────────────────────────── */
.quiz-card {
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.quiz-option {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  width: 100%;
  background: var(--color-surface);
  color: var(--color-text);
  text-align: left;
  position: relative;
  min-height: 48px;
  padding: var(--space-3) var(--space-6) var(--space-3) var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  font-size: var(--text-md);
  line-height: 1.5;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.quiz-option:hover {
  border-color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.05);
}

.quiz-option.selected {
  font-weight: 600;
  border-color: var(--color-action);
  background: var(--color-action-subtle);
}

.quiz-option.correct {
  font-weight: 600;
  border-color: var(--color-success);
  background: var(--color-success-subtle);
  color: var(--color-text);
}

.quiz-option:hover:not(:disabled) {
  border-color: var(--color-action);
  background: var(--color-action-subtle);
}

.choice-key {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-canvas);
  color: var(--color-text);
  font-size: 12px;
  font-weight: 700;
}

.quiz-option.correct .choice-key {
  background: var(--color-success-fill);
  color: var(--color-on-fill);
}

.quiz-option.wrong .choice-key {
  background: var(--color-danger-fill);
  color: var(--color-on-fill);
}

.quiz-option .choice-key {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--color-border-strong);
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: 700;
}

.quiz-option.selected .choice-key {
  border-color: var(--color-action);
  background: var(--color-action-fill);
  color: var(--color-on-fill);
}

.quiz-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
}

.quiz-feedback {
  margin-top: 16px;
  font-size: 14px;
  padding: var(--space-4);
  border-left-width: 4px;
  border-radius: var(--radius-md);
  line-height: 1.6;
}

.quiz-feedback strong {
  display: block;
  margin-bottom: 4px;
}

.quiz-feedback.correct {
  border: 1px solid rgb(var(--rgb-success) / 0.35);
  color: var(--color-text);
  border-color: var(--color-success);
  background: var(--color-success-subtle);
}

.quiz-feedback.wrong {
  border: 1px solid rgb(var(--rgb-danger) / 0.25);
  color: var(--color-text);
  border-color: var(--color-danger);
  background: var(--color-danger-subtle);
}

.quiz-feedback.wrong .quiz-feedback-status {
  color: var(--color-danger);
}

.quiz-feedback .quiz-feedback-status::before {
  margin-right: var(--space-1);
}

.quiz-feedback.wrong .quiz-feedback-answer {
  color: var(--color-success);
}

.quiz-feedback.correct .quiz-feedback-status,
.quiz-feedback.correct .quiz-feedback-answer {
  color: var(--color-success);
}

.quiz-feedback .pq-ref a {
  color: var(--color-action);
}

.empty-state {
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-muted);
  text-align: center;
}

/* ── PRACTICE QUIZ SETUP (Security+ / AI-103 style) ───────── */
.pq-setup {
  display: grid;
  gap: 20px;
  max-width: 920px;
  margin: 0 auto;
}

.pq-setup-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px 18px;
  padding: 4px 2px 0;
}

.pq-setup-eyebrow {
  display: block;
  margin-bottom: 4px;
  color: var(--color-text);
  font-size: 18px;
  font-weight: 700;
}

.pq-setup-toolbar-copy p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.5;
}

.pq-setup-toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pq-btn-ghost {
  background: var(--color-surface);
}

.pq-btn-ghost:hover {
  border-color: var(--color-action);
  color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.05);
}

.pq-hero {
  margin-bottom: 0;
}

.pq-resume {
  margin-bottom: 0;
}

.pq-panel {
  padding: 22px 24px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
}

.pq-panel-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  padding: 0;
  border: none;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 700;
}

.pq-panel-icon {
  font-size: 18px;
  line-height: 1;
}

.pq-panel-hint {
  margin: -4px 0 14px;
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.55;
}

.pq-mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.pq-mode-card {
  display: grid;
  gap: 8px;
  padding: 18px 18px 16px;
  border: 2px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
  color: var(--color-text);
  text-align: left;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.pq-mode-card:hover {
  border-color: rgb(var(--rgb-action) / 0.45);
}

.pq-mode-card.selected {
  border-color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.04);
  box-shadow: 0 0 0 1px rgb(var(--rgb-action) / 0.12);
}

.pq-mode-icon {
  font-size: 22px;
  line-height: 1;
}

.pq-mode-name {
  font-size: 15px;
  font-weight: 700;
}

.pq-mode-desc {
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.55;
}

.pq-topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.pq-topic-card {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-surface);
  color: var(--color-text);
  text-align: left;
  transition: all 0.15s;
}

.pq-topic-card:hover {
  border-color: rgb(var(--rgb-action) / 0.4);
}

.pq-topic-card.selected {
  border-color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.06);
  box-shadow: inset 0 0 0 1px rgb(var(--rgb-action) / 0.15);
}

.pq-topic-name {
  font-size: 13px;
  font-weight: 700;
  line-height: 1.45;
}

.pq-topic-count {
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 600;
}

.pq-topic-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.pq-option-block + .pq-option-block {
  margin-top: 18px;
}

.pq-option-label {
  margin-bottom: 10px;
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pq-toggle-row,
.pq-size-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.pq-toggle,
.pq-size-btn {
  min-height: 40px;
  padding: 8px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 13px;
  font-weight: 600;
  transition: all 0.15s;
}

.pq-toggle:hover,
.pq-size-btn:hover {
  border-color: var(--color-action);
  color: var(--color-action);
}

.pq-toggle.active,
.pq-size-btn.active {
  border-color: var(--color-action);
  background: var(--color-action-fill);
  color: var(--color-on-fill);
}

.tab-button.active {
  border-color: var(--color-action-fill);
  background: var(--color-action-fill);
  box-shadow: none;
  color: var(--color-on-fill);
}

.module-phase-step.active {
  border: 0;
  background: var(--color-action-subtle);
  box-shadow: inset 0 -3px 0 var(--color-action);
}

.pq-toggle:disabled,
.pq-size-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.pq-size-input-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 600;
}

.pq-size-input-wrap input {
  width: 72px;
  min-height: 40px;
  padding: 8px 10px;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 700;
  text-align: center;
}

.pq-size-input-wrap input:focus {
  border-color: var(--color-action);
  outline: none;
}

.pq-start-btn {
  width: 100%;
  margin-top: 4px;
  box-shadow: 0 4px 14px rgb(var(--rgb-action) / 0.28);
}

.pq-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-bottom: 16px;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-surface);
}

.pq-progressbar {
  flex: 1 1 160px;
  height: 8px;
  overflow: hidden;
  border-radius: 4px;
  background: var(--color-canvas);
}

.pq-progressbar > div {
  height: 100%;
  border-radius: 4px;
  background: var(--color-action-fill);
  transition: width 0.3s;
}

.pq-score,
.pq-timer {
  color: var(--color-text);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.pq-score-correct {
  color: var(--color-success);
}

.pq-timer {
  color: var(--color-action);
  font-variant-numeric: tabular-nums;
}

.pq-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.pq-question {
  margin-bottom: 16px;
  color: var(--color-text);
  white-space: pre-wrap;
  max-width: 80ch;
  font-size: var(--text-md);
  font-weight: 500;
  line-height: 1.7;
}

.pq-img {
  display: block;
  width: 100%;
  max-height: min(58vh, 640px);
  margin: 12px 0 16px;
  object-fit: contain;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface-alt);
}

.pq-img.answer {
  border-color: rgb(var(--rgb-success) / 0.35);
}

.pq-interactive {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.pq-order-hint {
  margin: 0 0 0.25rem;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.pq-order-row,
.pq-match-row {
  display: grid;
  grid-template-columns: minmax(8rem, 1fr) minmax(12rem, 2fr);
  gap: 0.75rem;
  align-items: center;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
}

.pq-order-row.correct,
.pq-match-row.correct {
  border-color: var(--color-success);
  background: rgb(var(--rgb-success) / 0.08);
}

.pq-yesno-table .pq-match-label {
  font-weight: 500;
}

.pq-yesno-choices {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

.pq-yesno-choice {
  min-width: 4.5rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.pq-yesno-choice:hover:not(:disabled) {
  border-color: var(--color-action);
}

.pq-yesno-choice.selected {
  border-color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.12);
  color: var(--color-action);
}

.pq-match-row.correct .pq-yesno-choice.selected {
  border-color: var(--color-success);
  background: rgb(var(--rgb-success) / 0.14);
  color: var(--color-success);
}

.pq-match-row.wrong .pq-yesno-choice.selected {
  border-color: var(--color-danger);
  background: rgb(var(--rgb-danger) / 0.12);
  color: var(--color-danger);
}

.pq-yesno-choice:disabled {
  cursor: default;
  opacity: 0.95;
}

.pq-order-row.wrong,
.pq-match-row.wrong {
  border-color: var(--color-danger);
  background: rgb(var(--rgb-danger) / 0.08);
}

.pq-order-label,
.pq-match-label {
  font-weight: 600;
  font-size: 0.92rem;
}

.pq-order-select {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-canvas);
  color: inherit;
  font: inherit;
}

.pq-order-select:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

@media (max-width: 640px) {
  .pq-order-row,
  .pq-match-row {
    grid-template-columns: 1fr;
  }
}

.pq-visual-prompt {
  margin: 12px 0 16px;
  padding: 16px;
  border: 1px dashed var(--color-border-strong);
  border-radius: 8px;
  background: var(--color-canvas);
}

.pq-visual-prompt p {
  margin-bottom: 12px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.6;
}

.pq-answer-sheet {
  margin: 12px 0 16px;
  padding: 16px;
  border: 1px solid rgb(var(--rgb-success) / 0.25);
  border-radius: 8px;
  background: rgb(var(--rgb-success) / 0.05);
}

.pq-answer-label {
  margin-bottom: 10px;
  color: var(--color-success);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pq-selfgrade {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}

.pq-selfgrade span {
  color: var(--color-text);
  font-size: 13px;
  font-weight: 700;
}

.pq-ref a {
  color: var(--color-action);
  font-weight: 600;
  text-decoration: none;
}

.pq-ref a:hover {
  text-decoration: underline;
}

.pq-missed {
  display: grid;
  gap: 8px;
}

.pq-missed-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.5;
  text-align: left;
  transition: border-color 0.15s;
}

.pq-missed-item:hover {
  border-color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.04);
}

.pq-exam-review .pq-review-list {
  display: grid;
  gap: 16px;
  margin-top: 14px;
}

.pq-review-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

.pq-review-item:last-child {
  border-bottom: none;
}

/* ══ GITHUB LAB INTEGRATION ═════════════════════════════════ */
/* Source badges — make it unmistakable which content is Microsoft-authoritative
   (repo) versus Study-Buddy authored pedagogy. */
.src-badge {
  flex-shrink: 0;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.src-badge.repo {
  background: rgb(var(--rgb-action) / 0.12);
  color: var(--color-action-strong);
}

.src-badge.authored {
  background: rgb(var(--rgb-purple) / 0.14);
  color: var(--color-purple);
}

/* Badges and pills share one shape and type style. */
.tag,
.topic-counter,
.lab-meta-pill,
.src-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-3);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.6;
}

/* Lab sidebar */
.lab-sidebar-hint {
  margin: -4px 0 10px;
  color: var(--color-text-muted);
  font-size: 12px;
  line-height: 1.45;
}

.lab-nav-button {
  position: relative;
}

.lab-nav-progress {
  display: block;
  width: 100%;
  height: 4px;
  margin-top: 8px;
  overflow: hidden;
  border-radius: 2px;
  background: var(--color-canvas);
}

.lab-nav-progress > span {
  display: block;
  height: 100%;
  border-radius: 2px;
  background: var(--accent, var(--color-action-fill));
  transition: width 0.3s;
}

.lab-sync-note {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  line-height: 1.5;
}

.lab-sync-note a {
  color: var(--color-action);
  font-weight: 600;
}

/* Lab path header */
.lab-meta-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
}

.lab-meta-pill {
  background: var(--color-canvas);
  color: var(--color-text);
}

.tool-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 11px;
  border: 1px solid rgb(var(--rgb-action) / 0.35);
  border-radius: 100px;
  background: rgb(var(--rgb-action) / 0.08);
  color: var(--color-action-strong);
  font-size: 11px;
  font-weight: 700;
}

.tool-badge.tool-bicep {
  border-color: rgb(var(--rgb-purple) / 0.35);
  background: rgb(var(--rgb-purple) / 0.08);
  color: var(--color-purple);
}

.tool-badge.tool-arm {
  border-color: rgb(var(--rgb-success) / 0.35);
  background: rgb(var(--rgb-success) / 0.08);
  color: var(--color-success);
}

.lab-progress-wrap {
  height: 8px;
  margin: 16px 0 4px;
  overflow: hidden;
  border-radius: 4px;
  background: var(--color-canvas);
}

.lab-progress-bar {
  height: 100%;
  border-radius: 4px;
  background: var(--accent, var(--color-action-fill));
  transition: width 0.4s;
}

.lab-path-lead {
  margin: 8px 0 4px;
  color: var(--color-text-muted);
  font-size: 12px;
  line-height: 1.5;
}

/* Numbered learning-path steps */
.lab-step {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.lab-step-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.lab-step-num {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-action-fill);
  color: var(--color-on-fill);
  font-size: 13px;
  font-weight: 800;
}

.lab-step-head h3 {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: none;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 700;
}

.lab-step-body {
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.6;
}

.lab-exam-obj {
  margin-bottom: 8px;
}

.lab-domain {
  display: inline-block;
  margin-left: 6px;
  padding: 2px 10px;
  border-radius: 100px;
  background: rgb(var(--rgb-action) / 0.1);
  color: var(--color-action-strong);
  font-size: 11px;
  font-weight: 700;
}

.lab-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.lab-two-col h4,
.lab-files h4 {
  margin-bottom: 6px;
  color: var(--color-text);
  font-size: 13px;
  font-weight: 700;
}

.lab-list {
  margin: 0;
  padding-left: 20px;
  line-height: 1.6;
}

.lab-list li {
  margin-bottom: 5px;
}

.topic-bullets li,
.topic-steps li {
  margin-bottom: var(--space-2);
}

.lab-instructions li {
  margin-bottom: var(--space-2);
}

.lab-tools-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 600;
}

.lab-link-list {
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.lab-link-list a {
  color: var(--color-action);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}

.lab-link-list a:hover {
  text-decoration: underline;
}

.file-type {
  display: inline-block;
  min-width: 34px;
  margin-right: 6px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--color-canvas);
  color: var(--color-text-muted);
  font-size: 10px;
  font-weight: 800;
  text-align: center;
  text-transform: uppercase;
}

/* Hands-on lab */
.lab-scenario {
  margin-bottom: 12px;
  padding: 12px 14px;
  border-left: 3px solid var(--color-action);
  border-radius: 0 8px 8px 0;
  background: rgb(var(--rgb-action) / 0.05);
  font-style: italic;
}

.lab-progress-inline {
  color: var(--color-action-strong);
  font-size: 13px;
  font-weight: 700;
}

.lab-progress-line {
  margin: 6px 0 16px;
  color: var(--color-text-muted);
  font-size: 13px;
}

/* Inline lab instructions — a seamless document, not a bordered card.
   Each task flows on the page; only a subtle top rule separates them. */
.lab-instructions-wrap {
  display: grid;
  /* minmax(0, 1fr): a wide table or long line must not widen the column. */
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
}

.lab-task-block {
  padding: 8px 0 4px;
}

.lab-task-block + .lab-task-block {
  border-top: 1px solid var(--color-border);
  margin-top: 8px;
  padding-top: 16px;
}

.lab-task-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.lab-task-heading h4 {
  flex: 1;
  min-width: 0;
  margin: 0;
  color: var(--color-action-strong);
  font-size: 15px;
  font-weight: 800;
}

.lab-task-check {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border-strong);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-on-fill);
  font-size: 14px;
  font-weight: 800;
  line-height: 1;
}

.lab-task-block.done .lab-task-check {
  border-color: var(--color-success-fill);
  background: var(--color-success-fill);
}

.lab-task-block.done .lab-task-heading h4 {
  color: var(--color-success);
}

/* Rendered markdown body — typography only, no container chrome. */
.lab-instructions {
  color: var(--color-text);
  font-size: 14px;
  max-width: 80ch;
  line-height: 1.7;
}

.lab-instructions > *:first-child {
  margin-top: 0;
}

.ch-progress-row .ch-topic-progress-wrap {
  flex: 1 1 12rem;
  max-width: 28rem;
  margin: 0;
}

/* One focus indicator everywhere: a 2px ring with a gap (WCAG technique C40). */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.lab-instructions p {
  margin: 0 0 10px;
}

.lab-instructions h3,
.lab-instructions h4,
.lab-instructions h5 {
  margin: 18px 0 8px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 800;
}

.lab-instructions ol,
.lab-instructions ul {
  margin: 0 0 10px;
  padding-left: 24px;
}

.lab-instructions li > p {
  margin-bottom: 6px;
}

.lab-instructions a {
  color: var(--color-action);
  font-weight: 600;
}

.lab-instructions code {
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--color-canvas);
  font-family: Consolas, "Courier New", monospace;
  font-size: 12.5px;
  word-break: break-word;
}

.topic-text code,
.topic-bullets code,
.topic-steps code,
.topic-keybox code,
.exam-tip code,
.topic-table code {
  padding: 1px 6px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-surface-subtle);
  font-family: var(--font-mono);
  font-size: 0.875em;
}

.lab-instructions pre code {
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font-size: inherit;
}

/* Repo "Note" / "Did you know?" callouts are plain blockquotes. */
.lab-instructions blockquote {
  color: var(--color-text);
  font-size: 13px;
  margin: var(--space-3) 0;
  padding: var(--space-3) var(--space-4);
  border-left: 4px solid var(--color-warning);
  border-radius: var(--radius-sm);
  background: var(--color-warning-subtle);
}

.lab-instructions blockquote p:last-child {
  margin-bottom: 0;
}

.lesson-header-copy p {
  max-width: var(--reading-max);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.lab-instructions table {
  width: 100%;
  margin: 0 0 12px;
  border-collapse: collapse;
  font-size: 13px;
}

.lab-instructions th,
.lab-instructions td {
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.topic-table th,
.topic-table td {
  padding: var(--space-3) var(--space-4);
  vertical-align: top;
}

.topic-table tbody tr:nth-child(even) td {
  background: var(--color-surface-alt);
}

.lab-instructions th {
  background: var(--color-canvas);
  font-weight: 700;
}

.topic-table th {
  background: var(--color-surface-subtle);
  color: var(--color-text);
  font-weight: 700;
  text-align: left;
  border-bottom: 2px solid var(--color-border-strong);
}

.lab-instructions img {
  margin: 4px 0 12px;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.lab-source-line {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 12px;
}

.lab-source-line a {
  color: var(--color-action);
  font-weight: 600;
  word-break: break-all;
}

.lab-files {
  margin-top: 16px;
  padding: 12px 14px;
  border: 1px dashed var(--color-border-strong);
  border-radius: 8px;
  background: var(--color-canvas);
}

/* Troubleshooting */
.lab-trouble {
  display: grid;
  gap: 12px;
}

.trouble-item {
  padding: 12px 14px;
  border: 1px solid rgb(var(--rgb-danger) / 0.25);
  border-left: 4px solid var(--color-danger);
  border-radius: 0 8px 8px 0;
  background: rgb(var(--rgb-danger) / 0.04);
}

.trouble-problem {
  margin-bottom: 6px;
  color: var(--color-danger);
  font-size: 13px;
  font-weight: 700;
}

.trouble-cause,
.trouble-fix {
  font-size: 13px;
  line-height: 1.55;
}

.trouble-cause {
  margin-bottom: 4px;
  color: var(--color-text-muted);
}

/* Knowledge check */
.kcheck {
  display: grid;
  gap: 16px;
}

.kcheck-prompt {
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
}

.kcheck-opts {
  display: grid;
  gap: 8px;
}

.kcheck-opt {
  padding: 10px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 13px;
  text-align: left;
  transition: all 0.15s;
}

.kcheck-opt:not(:disabled):hover {
  border-color: var(--color-action);
  background: rgb(var(--rgb-action) / 0.05);
}

.kcheck-opt:disabled {
  cursor: default;
}

.kcheck-opt.correct {
  border-color: var(--color-success);
  background: rgb(var(--rgb-success) / 0.1);
  color: var(--color-success);
  font-weight: 600;
}

.kcheck-opt.wrong {
  border-color: var(--color-danger);
  background: rgb(var(--rgb-danger) / 0.1);
  color: var(--color-danger);
}

/* State markers are shapes as well as colours (WCAG 1.4.1). The alt text
   after "/" is empty because the button already carries screen-reader text. */
.quiz-option.selected,
.quiz-option.correct,
.quiz-option.wrong {
  border-width: 2px;
}

.quiz-option.wrong {
  border-color: var(--color-danger);
  background: var(--color-danger-subtle);
  color: var(--color-text);
}

.quiz-option.selected::after,
.quiz-option.correct::after,
.quiz-option.wrong::after {
  position: absolute;
  top: 50%;
  right: var(--space-4);
  transform: translateY(-50%);
  font-size: var(--text-lg);
  font-weight: 700;
}

.kcheck-explain {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.55;
}

.kcheck-explain.right {
  background: rgb(var(--rgb-success) / 0.08);
  color: var(--color-success);
}

.kcheck-explain.off {
  background: rgb(var(--rgb-danger) / 0.06);
  color: var(--color-danger);
}

.lab-cleanup-note {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgb(var(--rgb-warning) / 0.1);
  font-size: 13px;
  line-height: 1.55;
}

/* Topic → lab recommendation card */
.lab-rec {
  margin: 4px 0;
  padding: 16px 18px;
  border: 1.5px solid rgb(var(--rgb-action) / 0.3);
  border-radius: 12px;
  background: linear-gradient(180deg, rgb(var(--rgb-action) / 0.05) 0%, rgb(var(--rgb-action) / 0.02) 100%);
}

.lab-rec-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.lab-rec-icon {
  font-size: 16px;
}

.lab-rec-eyebrow {
  flex: 1;
  min-width: 0;
  color: var(--color-action-strong);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lab-rec-title {
  margin-bottom: 6px;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 700;
}

.lab-rec-why {
  margin-bottom: 12px;
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.55;
}

.lab-rec-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.lab-rec-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ══ RESPONSIVE ═════════════════════════════════════════════
   Breakpoints run largest → smallest. Above 980px the sidebar is a
   permanent 320px rail. At/below 980px it becomes an off-canvas drawer
   toggled by the topbar hamburger, so the full width is freed for content
   on tablets and phones alike. Each smaller breakpoint only layers on the
   adjustments that width needs — nothing is redefined twice. */
/* ── Tablet & below: sidebar becomes an off-canvas drawer ── */
@media (max-width: 980px) {
  .nav-toggle {
    display: inline-flex;
  }

  .sidebar {
    width: min(320px, 86vw);
    min-width: 0;
    transform: translateX(-100%);
    box-shadow: 0 0 40px rgb(var(--rgb-shadow) / 0.35);
  }

  .app-shell.nav-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-scrim {
    display: block;
    pointer-events: none;
  }

  .app-shell.nav-open .sidebar-scrim {
    opacity: 1;
    pointer-events: auto;
  }

  .main {
    margin-left: 0;
  }

  /* Multi-column content grids fold to a single column now that the
         content spans the full viewport width. */
  .module-shell,
  .mind-map-panel,
  .two-col,
  .pq-mode-grid,
  .pq-topic-grid {
    grid-template-columns: 1fr;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .module-shell > aside.card {
    position: static;
    max-height: none;
  }

  .topic-slide-body {
    max-height: none;
  }

  .topic-viewer {
    min-height: 0;
  }

  .pq-size-input-wrap {
    width: 100%;
    margin-left: 0;
  }

  .pq-setup-toolbar-actions {
    width: 100%;
  }

  .pq-setup-toolbar-actions .button {
    flex: 1 1 auto;
  }
}

/* ── Phone: stack the topbar and single-column everything ── */
@media (max-width: 640px) {
  .content,
  .topbar {
    padding-left: 16px;
    padding-right: 16px;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .view-tabs,
  .lesson-actions,
  .inline-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .tab-button,
  .button {
    width: 100%;
  }

  .stats-row,
  .stats-row.two,
  .chapters-grid,
  .lab-two-col {
    grid-template-columns: 1fr;
  }

  .dashboard-hero {
    padding: 26px 22px;
  }

  .dashboard-resume-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .mind-map-image-link {
    min-height: 260px;
    max-height: 360px;
  }
}

/* ── Small phone: tighten padding so nothing overflows ── */
@media (max-width: 400px) {
  .dashboard-hero {
    padding: 22px 18px;
  }

  .dashboard-hero h2 {
    font-size: 22px;
  }

  .quiz-card,
  .pq-panel {
    padding: 18px 16px;
  }
}

.card h2,
.lesson-panel h2 {
  font-size: var(--text-xl);
  line-height: 1.3;
}

.lesson-header h2 {
  color: var(--color-text);
}

/* Respect the user's motion preference: no transitions or animations. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}

/* ── Scenario navigation: list beside the selected scenario ── */
.scenario-layout {
  display: grid;
  gap: 16px;
  align-items: start;
}

.scenario-rail {
  display: grid;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
}

.scenario-rail h3 {
  margin: 0;
  font-size: 14px;
}

.card h3 {
  font-size: var(--text-lg);
  line-height: 1.35;
}

.lab-instructions h2,
.lab-instructions h3,
.lab-instructions h4 {
  margin: var(--space-5) 0 var(--space-2);
  line-height: 1.35;
}

.scenario-detail {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.scenario-step-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.scenario-step-bar .scenario-position {
  margin-left: auto;
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 600;
}

.scenario-step-bar .button {
  color: var(--color-action-strong);
  border-color: var(--color-action-strong);
}

.scenario-step-bar .button:hover:not(:disabled) {
  background: var(--color-action-fill-hover);
  color: var(--color-on-fill);
}

.scenario-step-bar .button.ghost {
  color: var(--color-action-strong);
  border-color: var(--color-action-border);
}

.scenario-step-bar .button.ghost:hover:not(:disabled) {
  background: var(--color-action-subtle);
  color: var(--color-action-strong);
}

.button:hover:not(:disabled) {
  background: var(--color-action-subtle);
  color: var(--color-action-strong);
}

.button.primary {
  border-color: var(--color-action-fill);
  background: var(--color-action-fill);
  color: var(--color-on-fill);
}

.button.primary:hover:not(:disabled) {
  border-color: var(--color-action-fill-hover);
  background: var(--color-action-fill-hover);
  color: var(--color-on-fill);
}

.button:active:not(:disabled) {
  transform: translateY(1px);
}

/* Secondary "ghost" buttons. styles.css drew them white-on-white outside the
   sidebar, which hid the chapter header's Reset Progress button entirely. */
.button.ghost {
  border-color: var(--color-border-strong);
  background: transparent;
  color: var(--color-text);
}

.button.ghost:hover:not(:disabled) {
  background: var(--color-surface-subtle);
  color: var(--color-text);
}

.sidebar .button.ghost {
  border-color: rgb(var(--rgb-on-dark) / 0.35);
  background: transparent;
  color: var(--color-on-fill);
}

.sidebar .button.ghost:hover {
  background: rgb(var(--rgb-on-dark) / 0.12);
  color: var(--color-on-fill);
}

.scenario-number {
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 700;
}

.scenario-objective:focus-visible,
.objective-focus:focus-visible {
  outline: 3px solid var(--color-action);
  outline-offset: 2px;
}

@media (min-width: 56rem) {
  .scenario-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
  }

  .scenario-rail {
    position: sticky;
    top: 16px;
    max-height: calc(100vh - 32px);
    overflow: auto;
  }
}

/* ── Collapsible sidebar ─────────────────────────────────── */
.sidebar-controls {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  padding: 12px 12px 0;
}

.sidebar-toggle,
.sidebar-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgb(var(--rgb-on-dark) / 0.18);
  border-radius: 8px;
  background: transparent;
  color: var(--sidebar-text);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.sidebar-toggle:hover,
.sidebar-close:hover {
  background: var(--sidebar-hover);
}

.sidebar-toggle:focus-visible,
.sidebar-close:focus-visible {
  outline: 3px solid var(--color-focus-on-dark);
  outline-offset: 2px;
}

.sidebar :focus-visible {
  outline-color: var(--color-focus-on-dark);
}

/* The drawer's close button only exists on narrow screens. */
.sidebar-close {
  display: none;
}

/* Visually hidden but still announced by screen readers. */
.sidebar-collapsed .module-label,
.sidebar-collapsed .module-count,
.sidebar-collapsed .nav-ch-arrow,
.sidebar-collapsed .nav-section,
.sidebar-collapsed .curriculum-heading,
.sidebar-collapsed .overview-link > span:not(.nav-icon),
.sidebar-collapsed .review-link > span:not(.nav-icon),
.sidebar-collapsed .nav-section-link > span:not(.nav-section-emoji),
.sidebar-collapsed .brand > div:not(.brand-mark),
.sidebar-collapsed .search-box > span {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Lab list items add a progress bar as the last child, so the lesson-button
   "meta" rule (last span) missed the lesson/duration line. Style it directly. */
.lab-nav-button > span:nth-child(2) {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.5;
}

.flashcard-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--color-action);
}

@media (max-width: 980px) {
  .sidebar-toggle {
    display: none;
  }

  .sidebar-close {
    display: inline-flex;
  }
}

@media (min-width: 981px) {
  .sidebar {
    transition: width 0.2s ease;
  }

  .main {
    transition: margin-left 0.2s ease;
  }

  .app-shell.sidebar-collapsed .sidebar {
    width: 72px;
    min-width: 72px;
  }

  .app-shell.sidebar-collapsed .main {
    margin-left: 72px;
  }

  .sidebar-collapsed .sidebar-controls {
    justify-content: center;
    padding-inline: 4px;
  }

  .sidebar-collapsed .sidebar-toggle {
    width: 56px;
  }

  .sidebar-collapsed .brand {
    padding: 16px 8px;
  }

  .sidebar-collapsed .brand-mark {
    font-size: 10px;
    padding-inline: 4px;
  }

  /* Search and bulk actions need room; reach them by expanding the sidebar. */
  .sidebar-collapsed .search-box,
  .sidebar-collapsed .sidebar-actions {
    display: none;
  }

  .sidebar-collapsed .module-button,
  .sidebar-collapsed .overview-link,
  .sidebar-collapsed .review-link,
  .sidebar-collapsed .nav-section-link {
    justify-content: center;
    gap: 0;
    padding-inline: 0;
  }

  .sidebar-collapsed .nav-ch-sub {
    padding-left: 0;
  }
}

html {
  /* WCAG 2.4.11: keep focused elements clear of the sticky top bar. */
  scroll-padding-top: calc(var(--topbar-height) + var(--space-4));
}

code,
kbd,
pre,
samp {
  font-family: var(--font-mono);
}

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.topic-counter {
  background: var(--color-action-subtle);
  color: var(--color-action-strong);
}

.ch-progress-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-3);
}

.ch-progress-label {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 600;
}

.code-block {
  position: relative;
  margin: var(--space-3) 0 var(--space-4);
}

.code-block pre,
.topic-code,
.lab-instructions pre {
  margin: 0;
  padding: var(--space-4);
  padding-right: 5.5rem;
  overflow: auto;
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  background: var(--color-code-bg);
  color: var(--color-code-text);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  tab-size: 2;
}

.code-copy {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  min-width: 64px;
  min-height: 32px;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-code-button-border);
  border-radius: var(--radius-sm);
  background: var(--color-code-button);
  color: var(--color-code-button-text);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
}

.code-copy:hover {
  background: var(--color-code-button-hover);
  color: var(--color-on-fill);
}

.code-copy:focus-visible {
  outline-color: var(--color-focus-on-dark);
}

/* The lab article is a one-column grid whose column used to size to its
   widest unbreakable child, pushing it past the screen at 360px. */
.lab-path {
  grid-template-columns: minmax(0, 1fr);
  overflow-wrap: anywhere;
}

.flashcard-stage {
  display: grid;
  justify-items: center;
  gap: var(--space-3);
  max-width: 42rem;
  margin: var(--space-4) auto 0;
}

.flashcard-progress {
  width: 100%;
  height: 6px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: var(--color-surface-subtle);
}

.flashcard {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 16rem;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-2);
  color: var(--color-text);
  font-size: var(--text-lg);
  line-height: 1.6;
  text-align: center;
  cursor: pointer;
}

.flashcard.flipped {
  border-color: var(--color-action-border);
  background: var(--color-action-subtle);
}

.flashcard-side {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.flashcard.flipped .flashcard-side {
  color: var(--color-action-strong);
}

.flashcard-hint,
.flashcard-meta {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  text-align: center;
}

.flashcard-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}

@media (max-width: 56rem) {
  .module-chapter-header {
    grid-template-columns: minmax(0, 1fr);
  }

  .module-chapter-header-actions .button {
    width: auto;
  }
}

@media (max-width: 640px) {
  .content {
    padding: var(--space-4) var(--space-4) var(--space-6);
  }

  /* Compact top bar: the view switch sits in one row instead of two stacked rows. */
  .topbar {
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
  }

  .topbar .view-tabs {
    flex: 1;
    flex-direction: row;
  }

  .topbar .view-tabs .tab-button {
    flex: 1;
    width: auto;
  }

  .topbar-heading .eyebrow {
    display: none;
  }

  .card,
  .module-chapter-header {
    padding: var(--space-4);
  }

  .module-chapter-header h2 {
    font-size: var(--text-xl);
  }

  .module-phase-step {
    flex: 0 0 8.5rem;
  }

  .scenario-step-bar .button {
    flex: 1 1 auto;
    width: auto;
  }

  .scenario-step-bar .scenario-position {
    flex-basis: 100%;
    margin-left: 0;
    text-align: center;
  }

  .flashcard {
    min-height: 13rem;
    padding: var(--space-5) var(--space-4);
    font-size: var(--text-md);
  }

  .flashcard-nav .button {
    flex: 1;
    width: auto;
  }
}

/* ── Icons (bundled Lucide subset, see icons.js) ─────────── */
/* Icons scale with the font size of their slot, so existing slot sizes still apply. */
.icon {
  display: inline-block;
  flex: none;
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
}

.icon-inline {
  width: 0.85em;
  height: 0.85em;
  margin-left: 0.25em;
}

.button .icon,
.resume-card-btn .icon {
  width: 1.1em;
  height: 1.1em;
  vertical-align: -0.2em;
}

.nav-icon,
.nav-section-emoji,
.nav-ch-arrow,
.panel-icon,
.pq-panel-icon,
.pq-mode-icon,
.module-phase-icon,
.stat-card .stat-icon,
.lab-rec-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.nav-icon {
  font-size: var(--icon-md);
}

.panel-icon,
.pq-panel-icon,
.pq-mode-icon,
.module-phase-icon,
.stat-card .stat-icon,
.lab-rec-icon {
  color: var(--color-action);
}

.module-phase-step.active .module-phase-icon {
  color: var(--color-action-strong);
}

.trouble-problem .icon,
.kcheck-explain .icon,
.lab-meta-pill .icon {
  margin-right: 0.15em;
}

.lab-task-check .icon {
  width: 16px;
  height: 16px;
  stroke-width: 3;
}

/* Quiz state markers use the same check and x shapes as the icon set. */
.quiz-option.selected::after,
.quiz-option.correct::after,
.quiz-option.wrong::after,
.quiz-feedback.correct .quiz-feedback-status::before,
.quiz-feedback.wrong .quiz-feedback-status::before {
  content: "" / "";
  display: inline-block;
  width: 1.1em;
  height: 1.1em;
  background: currentColor;
  vertical-align: -0.2em;
  -webkit-mask: var(--marker) center / contain no-repeat;
  mask: var(--marker) center / contain no-repeat;
}

.quiz-option.selected::after,
.quiz-option.correct::after,
.quiz-feedback.correct .quiz-feedback-status::before {
  --marker: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
}

.quiz-option.wrong::after,
.quiz-feedback.wrong .quiz-feedback-status::before {
  --marker: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 6 6 18'/%3E%3Cpath d='m6 6 12 12'/%3E%3C/svg%3E");
}

.quiz-option.selected::after {
  background: var(--color-action);
}

.quiz-option.correct::after {
  background: var(--color-success);
}

.quiz-option.wrong::after {
  background: var(--color-danger);
}

/* ── Top bar tools: view switch and theme control ─────────── */
.topbar-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* A radio group drawn as a segmented control: arrow keys move between
   options and the checked option is announced, with no extra script. */
.theme-switch {
  display: inline-flex;
  gap: 2px;
  margin: 0;
  padding: 2px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.theme-option {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 34px;
  border-radius: calc(var(--radius-sm) - 2px);
  color: var(--color-text-muted);
  font-size: var(--icon-sm);
  cursor: pointer;
}

.theme-option input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.theme-option:hover {
  background: var(--color-surface-subtle);
  color: var(--color-text);
}

.theme-option:has(input:checked) {
  background: var(--color-action-fill);
  color: var(--color-on-fill);
}

.theme-option:has(input:focus-visible) {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

@media (max-width: 640px) {
  .topbar-tools {
    flex-wrap: nowrap;
    justify-content: stretch;
    gap: var(--space-2);
  }

  /* View switch and theme control share one row on phones. */
  .topbar .view-tabs {
    flex-wrap: nowrap;
    min-width: 0;
  }

  .topbar .view-tabs .tab-button {
    min-width: 0;
    padding-inline: var(--space-2);
  }

  .theme-option {
    width: 32px;
  }
}

/* Wide lab tables scroll inside their own region (wrapped by app.js). */
.table-scroll {
  max-width: 100%;
  overflow-x: auto;
  margin: var(--space-3) 0;
}

.table-scroll > table {
  margin: 0;
}

/* Completion is stated in text with an icon, never by colour alone. */
.item-status {
  display: inline-flex;
  align-items: center;
  gap: 0.2em;
  color: var(--color-success);
  font-weight: 600;
}

/* Long reference URLs, commands and answer text wrap instead of widening the
   page on phones. The text itself is unchanged. */
.quiz-card,
.quiz-feedback,
.pq-question,
.quiz-option,
.pq-match-row,
.pq-order-row,
.pq-interactive {
  min-width: 0;
  overflow-wrap: anywhere;
}

.quiz-card img,
.pq-img img {
  max-width: 100%;
  height: auto;
}

/* ── Lesson knowledge check (knowledge-check.js) ───────────── */
.knowledge-check {
  margin-top: var(--space-6);
}

.kc-header h3 {
  margin: 0 0 var(--space-1);
}

.kc-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.kc-question {
  margin: 0;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  min-width: 0;
}

.kc-question legend {
  padding: 0;
  margin-bottom: var(--space-3);
  font-weight: 600;
  line-height: 1.5;
}

.kc-number {
  display: block;
  margin-bottom: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

.kc-hint {
  font-weight: 400;
  color: var(--color-text-muted);
}

.kc-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.kc-option {
  display: grid;
  grid-template-columns: auto 28px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: center;
  min-height: 48px;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  line-height: 1.5;
}

.kc-option:hover {
  border-color: var(--color-action);
}

.kc-option:focus-within {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.kc-option.selected {
  border-color: var(--color-action);
  background: var(--color-action-subtle);
}

.kc-option input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--color-action);
}

.kc-option input:disabled {
  cursor: default;
}

.kc-option.is-answer {
  border-color: var(--color-success);
  background: var(--color-success-subtle);
}

.kc-option.is-answer .choice-key {
  background: var(--color-success-fill);
  color: var(--color-on-fill);
}

.kc-option.is-wrong {
  border-color: var(--color-danger);
  background: var(--color-danger-subtle);
}

.kc-option.is-wrong .choice-key {
  background: var(--color-danger-fill);
  color: var(--color-on-fill);
}

.kc-option-note {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
}

.kc-feedback {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-left: 4px solid var(--color-success);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.kc-feedback.is-incorrect {
  border-left-color: var(--color-danger);
}

.kc-feedback p {
  margin: var(--space-1) 0 var(--space-2);
}

.kc-feedback a {
  color: var(--color-action);
}

.kc-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.kc-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.kc-score {
  margin: 0;
  font-weight: 600;
}

.kc-error {
  margin: 0;
  color: var(--color-danger);
  font-weight: 600;
}

@media (max-width: 600px) {
  .kc-question {
    padding: var(--space-3);
  }

  .kc-buttons .button {
    width: 100%;
  }
}

/* Long identifiers (rule names, URLs) must wrap inside the option cards on narrow screens. */
.kc-option-text,
.kc-question legend,
.kc-feedback p,
.kc-feedback a {
  min-width: 0;
  overflow-wrap: anywhere;
}

/* Local verified bank: case-study context and Learn proof (lms/private only) */
.pq-context {
  margin: 0 0 var(--space-4);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.pq-context summary,
.pq-proof summary {
  cursor: pointer;
  font-weight: 600;
}
.pq-context p {
  margin: var(--space-2) 0;
  max-width: var(--reading-max);
}
.pq-context .pq-img {
  max-width: 100%;
}
.pq-proof {
  margin-top: var(--space-3);
}
.pq-proof-scope {
  margin: var(--space-3) 0 var(--space-1);
  font-size: var(--text-sm);
}
.pq-claim {
  margin: var(--space-2) 0;
}
.pq-proof-ev {
  margin: var(--space-1) 0 0;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
}
.pq-proof-ev blockquote {
  margin: var(--space-1) 0;
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-border);
}
.pq-proof-date {
  white-space: nowrap;
}
.quiz-feedback .pq-ref {
  margin-bottom: var(--space-4);
}
.pq-proof {
  margin-top: var(--space-4);
}
.pq-proof summary {
  min-height: 24px;
  padding: var(--space-1) 0;
}
.quiz-feedback .pq-ref a {
  display: inline-block;
  min-height: 24px;
  padding: var(--space-1) 0;
}

/* The knowledge check is a step inside the topic viewer, so it should not draw a second card. */
.topic-slide-body .knowledge-check { border: 0; box-shadow: none; background: transparent; padding: 0; margin: 0; }

.topic-slide-body.topic-slide-body--check { max-height: none; overflow: visible; }

/* Wide and ultrawide screens: use the width and scale text up instead of leaving empty margins. */
@media (min-width: 1800px) {
  :root { --content-max: 100rem; --reading-max: 80ch; }
  html { font-size: 112.5%; }
}

@media (min-width: 2400px) {
  :root { --content-max: 120rem; --reading-max: 88ch; }
  html { font-size: 125%; }
}