/* =============================================
   HASE & SCHILDKRÖTE — Learning Website
   Stylesheet
   ============================================= */

/* --- CSS Custom Properties --- */
:root {
  /* Base colors */
  --bg-primary: #faf8f4;
  --bg-secondary: #f0ede6;
  --bg-card: #ffffff;
  --text-primary: #2c2c2c;
  --text-secondary: #5a5a5a;
  --text-muted: #8a8a8a;
  --border-light: #e8e4dc;
  --border-medium: #d4cfc5;

  /* Accent: neutral (before story choice) */
  --accent: #7c6f5b;
  --accent-light: #a89a82;
  --accent-bg: #f5f0e8;
  --accent-glow: rgba(124, 111, 91, 0.15);

  /* Hare palette */
  --hare-primary: #c47d2e;
  --hare-secondary: #e8a84c;
  --hare-bg: #fdf5eb;
  --hare-light: #fcecd4;
  --hare-glow: rgba(196, 125, 46, 0.15);

  /* Tortoise palette */
  --tortoise-primary: #3a8a6e;
  --tortoise-secondary: #5cb896;
  --tortoise-bg: #eef8f3;
  --tortoise-light: #d4f0e4;
  --tortoise-glow: rgba(58, 138, 110, 0.15);

  /* Typography */
  --font-serif: 'Merriweather', Georgia, 'Times New Roman', serif;
  --font-sans: 'Source Sans 3', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;

  /* Sizes */
  --sidebar-width: 280px;
  --topbar-height: 56px;
  --content-max-width: 800px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.10);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Theme overrides */
[data-theme="hare"] {
  --accent: var(--hare-primary);
  --accent-light: var(--hare-secondary);
  --accent-bg: var(--hare-bg);
  --accent-glow: var(--hare-glow);
}

[data-theme="tortoise"] {
  --accent: var(--tortoise-primary);
  --accent-light: var(--tortoise-secondary);
  --accent-bg: var(--tortoise-bg);
  --accent-glow: var(--tortoise-glow);
}

/* LRS mode */
[data-lrs="true"] {
  --font-sans: 'Verdana', 'Source Sans 3', sans-serif;
  font-size: 120%;
  letter-spacing: 0.02em;
  word-spacing: 0.08em;
  line-height: 1.9 !important;
}

[data-lrs="true"] .narrative__text,
[data-lrs="true"] .chapter-section {
  max-width: 640px;
}

[data-lrs="true"] p {
  margin-bottom: 1.2em;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* --- Top Bar --- */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(250, 248, 244, 0.92);
}

.top-bar__left,
.top-bar__right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 160px;
}

.top-bar__right {
  justify-content: flex-end;
}

.top-bar__center {
  flex: 1;
  max-width: 320px;
  margin: 0 1rem;
}

/* LRS Button */
.btn-lrs {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-lrs:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.btn-lrs.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Language Selector */
.lang-selector {
  display: flex;
  gap: 2px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.btn-lang {
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  letter-spacing: 0.03em;
}

.btn-lang:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.5);
}

.btn-lang.active {
  background: var(--bg-card);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* Progress Bar */
.progress-bar {
  position: relative;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 4px;
  transition: width var(--transition-slow);
}

.progress-bar__text {
  position: absolute;
  top: 12px;
  right: 0;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* =============================================
   LANDING PAGE
   ============================================= */
.landing {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--topbar-height) + 2rem) 1.5rem 3rem;
  text-align: center;
}

.landing__content {
  max-width: 720px;
  animation: fadeInUp 0.8s ease;
}

.landing__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  letter-spacing: -0.02em;
}

.landing__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 300;
  margin-bottom: 2.5rem;
}

.landing__intro {
  margin-bottom: 3rem;
}

.landing__intro p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  font-family: var(--font-serif);
  font-style: italic;
}

/* Story Choice Cards */
.story-choice {
  display: flex;
  align-items: stretch;
  gap: 2rem;
  justify-content: center;
}

.story-choice__divider {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: lowercase;
  font-style: italic;
}

.story-card {
  width: 260px;
  padding: 2rem 1.5rem;
  background: var(--bg-card);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.story-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.story-card--hare::before {
  background: linear-gradient(90deg, var(--hare-primary), var(--hare-secondary));
}

.story-card--tortoise::before {
  background: linear-gradient(90deg, var(--tortoise-primary), var(--tortoise-secondary));
}

.story-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-medium);
}

.story-card:hover::before {
  opacity: 1;
}

.story-card--hare:hover {
  border-color: var(--hare-secondary);
}

.story-card--tortoise:hover {
  border-color: var(--tortoise-secondary);
}

.story-card__image {
  width: 140px;
  height: 140px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  overflow: hidden;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.story-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.story-card__name {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.story-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* =============================================
   READING VIEW: Sidebar + Content
   ============================================= */
.reading-view {
  display: flex;
  min-height: 100vh;
  padding-top: var(--topbar-height);
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  min-height: calc(100vh - var(--topbar-height));
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-light);
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  bottom: 0;
  overflow-y: auto;
  z-index: 50;
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.sidebar__toggle {
  display: none;
  position: absolute;
  top: 0.75rem;
  right: -3rem;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  z-index: 51;
}

.sidebar__header {
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border-light);
}

.sidebar__back {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  transition: color var(--transition-fast);
}

.sidebar__back:hover {
  color: var(--accent);
}

.sidebar__animal {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar__animal img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
}

.sidebar__animal span {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
}

/* Chapter List (Book Spine) */
.chapter-list {
  list-style: none;
  padding: 1rem 0;
  flex: 1;
}

.chapter-list__item {
  position: relative;
}

.chapter-list__link {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.4;
  transition: all var(--transition-fast);
  cursor: pointer;
  border-left: 3px solid transparent;
  text-decoration: none;
}

.chapter-list__link:hover {
  background: rgba(255,255,255,0.5);
  color: var(--text-primary);
  text-decoration: none;
}

.chapter-list__link.active {
  background: var(--bg-card);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

.chapter-list__link.completed {
  color: var(--text-muted);
}

.chapter-list__link.completed::after {
  content: '✓';
  margin-left: auto;
  color: var(--accent-light);
  font-size: 0.85rem;
}

.chapter-list__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--border-light);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.chapter-list__link.active .chapter-list__number {
  background: var(--accent);
  color: white;
}

.chapter-list__title {
  padding-top: 2px;
}

/* --- Chapter Content --- */
.chapter-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 2.5rem 2rem 4rem;
  max-width: calc(var(--content-max-width) + var(--sidebar-width) + 4rem);
  animation: fadeIn 0.5s ease;
}

/* Chapter Header */
.chapter-header {
  margin-bottom: 3rem;
}

.chapter-header__image {
  width: 100%;
  max-height: 320px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 2rem;
  background: var(--accent-bg);
}

.chapter-header__image img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.chapter-header__number {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.chapter-header__title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.chapter-header__concept {
  font-size: 1rem;
  color: var(--accent);
  font-weight: 500;
  font-style: italic;
}

/* Chapter Sections */
.chapter-section {
  margin-bottom: 2.5rem;
  max-width: var(--content-max-width);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-bg);
}

.section-title svg {
  color: var(--accent);
  flex-shrink: 0;
}

/* Narrative */
.narrative__text {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-primary);
  max-width: var(--content-max-width);
}

.narrative__text p {
  margin-bottom: 1em;
}

.narrative__text p:first-child::first-letter {
  font-size: 2.8em;
  float: left;
  line-height: 1;
  margin-right: 0.1em;
  margin-top: 0.05em;
  color: var(--accent);
  font-weight: 700;
}

/* Problem Box */
.problem {
  background: var(--accent-bg);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border-left: 4px solid var(--accent);
}

.problem .section-title {
  border-bottom: none;
  padding-bottom: 0;
}

/* Concept Explanation */
.concept-explanation {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.concept-explanation .section-title {
  border-bottom-color: var(--border-light);
}

.concept-explanation .concept-block {
  margin-top: 0.75rem;
}

.concept-explanation .concept-block code {
  display: block;
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0.75rem 0;
  white-space: pre-wrap;
  border: 1px solid var(--border-light);
}

/* Guided Task */
.guided-task {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 2px solid var(--accent);
  box-shadow: var(--shadow-md);
}

.guided-task .section-title {
  color: var(--accent);
}

.guided-task__container .task-step {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-light);
  align-items: flex-start;
}

.guided-task__container .task-step:last-child {
  border-bottom: none;
}

.task-step__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
}

.task-step__content {
  flex: 1;
}

.task-step__content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--text-primary);
}

.task-step__content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.task-step__content code {
  background: var(--bg-secondary);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
}

.task-step__content .calliope-block {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--accent-bg);
  border: 1px solid var(--accent-light);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  margin: 0.2rem 0;
}

.task-step__check {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.5rem;
  padding: 0.4rem 0.75rem;
  background: var(--accent-bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.task-step__check:hover {
  background: var(--accent);
  color: white;
}

.task-step__check input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

/* Open Tasks */
.open-tasks .task-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1rem;
  transition: all var(--transition-fast);
}

.open-tasks .task-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--accent-light);
}

.open-tasks .task-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.open-tasks .task-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.open-tasks .task-card .task-level {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-bottom: 0.5rem;
}

.task-level--guided {
  background: var(--accent-bg);
  color: var(--accent);
}

.task-level--explore {
  background: #fef3e2;
  color: #b8860b;
}

.task-level--create {
  background: #e8f4fd;
  color: #2973a5;
}

/* Extension Tasks */
.extension-tasks {
  background: linear-gradient(135deg, var(--accent-bg), var(--bg-card));
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px dashed var(--accent-light);
}

.extension-tasks .extension-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.extension-tasks .extension-item:last-child {
  border-bottom: none;
}

.extension-tasks .extension-item strong {
  color: var(--text-primary);
}

/* Reflection — removed from layout, styles kept for safety */
.reflection {
  display: none;
}

.reflection__quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  border-left: 3px solid var(--accent);
  padding-left: 1.25rem;
  margin: 0;
}

/* Hardware Toggle (Landing Page) */
.hardware-toggle {
  margin-top: 2.5rem;
}

.hardware-toggle__label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  font-size: 0.92rem;
  color: var(--text-secondary);
  padding: 0.75rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.hardware-toggle__label:hover {
  border-color: var(--accent-light);
  box-shadow: var(--shadow-sm);
}

.hardware-toggle__input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.hardware-toggle__switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  background: var(--border-medium);
  border-radius: 11px;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.hardware-toggle__switch::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.hardware-toggle__input:checked + .hardware-toggle__switch {
  background: var(--accent);
}

.hardware-toggle__input:checked + .hardware-toggle__switch::after {
  transform: translateX(18px);
}

.hardware-toggle__text {
  line-height: 1.4;
}

/* Bonus Chapter Styles */
.chapter-list__link.bonus {
  opacity: 0.7;
  font-size: 0.82rem;
}

.chapter-list__link.bonus .chapter-list__number {
  background: var(--border-light);
  color: var(--text-muted);
  font-size: 0.65rem;
}

.chapter-list__link.bonus.active .chapter-list__number {
  background: var(--accent-light);
  color: white;
}

.bonus-badge {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-light);
  background: var(--accent-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  margin-left: 0.4rem;
  vertical-align: middle;
}

.bonus-divider {
  padding: 0.5rem 1.25rem 0.25rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  margin-top: 0.5rem;
}

/* Concept label in sidebar */
.chapter-list__concept {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
  line-height: 1.3;
  margin-top: 1px;
}

/* Chapter Navigation */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
  max-width: var(--content-max-width);
}

.btn-chapter-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.btn-chapter-nav:hover {
  background: var(--accent-bg);
  color: var(--accent);
}

.btn-next {
  margin-left: auto;
  background: var(--accent);
  color: white;
}

.btn-next:hover {
  background: var(--accent-light);
  color: white;
  transform: translateX(2px);
}

.btn-prev:hover {
  transform: translateX(-2px);
}

.btn-chapter-nav[hidden] {
  visibility: hidden;
}

/* =============================================
   ANIMATIONS
   ============================================= */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .sidebar__toggle {
    display: flex;
  }

  .chapter-content {
    margin-left: 0;
    padding: 2rem 1.5rem 3rem;
  }
}

@media (max-width: 768px) {
  :root {
    --topbar-height: 48px;
  }

  .top-bar {
    padding: 0 1rem;
  }

  .top-bar__center {
    display: none;
  }

  .landing {
    padding: calc(var(--topbar-height) + 1.5rem) 1rem 2rem;
  }

  .landing__title {
    font-size: 2rem;
  }

  .story-choice {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }

  .story-card {
    width: 100%;
    max-width: 300px;
  }

  .chapter-content {
    padding: 1.5rem 1rem 3rem;
  }

  .chapter-header__image img {
    height: 200px;
  }

  .chapter-nav {
    flex-direction: column;
    gap: 0.75rem;
  }

  .btn-chapter-nav {
    width: 100%;
    justify-content: center;
  }

  .btn-next {
    margin-left: 0;
  }
}

@media (max-width: 480px) {
  .lang-selector {
    gap: 1px;
  }

  .btn-lang {
    padding: 0.25rem 0.4rem;
    font-size: 0.7rem;
  }

  .btn-lrs__label {
    display: none;
  }

  .story-card__image {
    width: 100px;
    height: 100px;
  }
}

/* =============================================
   PRINT STYLES
   ============================================= */
@media print {
  .top-bar,
  .sidebar,
  .chapter-nav,
  .btn-lrs,
  .lang-selector {
    display: none !important;
  }

  .chapter-content {
    margin-left: 0;
    padding: 0;
  }

  .reading-view {
    padding-top: 0;
  }

  body {
    font-size: 12pt;
    color: black;
    background: white;
  }
}

/* =============================================
   UTILITY CLASSES
   ============================================= */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

.text-accent {
  color: var(--accent);
}

.font-serif {
  font-family: var(--font-serif);
}