@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:ital,wght@0,400;0,700;1,400&family=Inter:wght@400;500;600;700&display=swap');

/* === CSS CUSTOM PROPERTIES === */
:root {
  --font-body: 'Inter', sans-serif;
  --font-accessible: 'Atkinson Hyperlegible', sans-serif;
  --font-size: 18px;
  --line-height: 1.7;
  --color-bg: #f8f7f4;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #5a5a7a;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-accent: #7c3aed;
  --color-accent-light: #ede9fe;
  --color-success: #059669;
  --color-error: #dc2626;
  --color-warning: #d97706;
  --color-border: #e2e1f0;
  --color-card: #ffffff;
  --color-nav-bg: #1a1a2e;
  --color-nav-text: #ffffff;
  --color-highlight: #fef3c7;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 6px;
  --max-width: 860px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --color-bg: #0f0f1a;
  --color-surface: #1a1a2e;
  --color-text: #e8e8f8;
  --color-text-muted: #9090b0;
  --color-border: #2a2a4a;
  --color-card: #1e1e32;
  --color-highlight: #3a3000;
  --color-nav-bg: #080810;
  --color-accent-light: #2d1b5e;
}

/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: var(--font-size);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  line-height: var(--line-height);
  color: var(--color-text);
  background: var(--color-bg);
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

body.font-accessible {
  font-family: var(--font-accessible);
}

img { max-width: 100%; height: auto; }
a { color: var(--color-primary); text-decoration: underline; }
a:hover { color: var(--color-primary-dark); }

/* === HEADER / TOPBAR === */
.site-header {
  background: var(--color-nav-bg);
  color: var(--color-nav-text);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-nav-text);
  text-decoration: none;
  flex: 1;
  letter-spacing: -0.02em;
}

.site-title span {
  color: #818cf8;
}

/* === ACCESSIBILITY TOOLBAR === */
.a11y-toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.a11y-btn {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--color-nav-text);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.a11y-btn:hover,
.a11y-btn.active {
  background: rgba(255,255,255,0.25);
}

.a11y-btn.active {
  border-color: #818cf8;
  color: #818cf8;
}

.font-size-controls {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.font-size-controls span {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
  padding: 0 0.25rem;
}

/* === MAIN LAYOUT === */
.page-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* === CHAPTER PROGRESS BAR === */
.progress-bar {
  height: 3px;
  background: var(--color-border);
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  z-index: 99;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  width: 0%;
  transition: width 0.1s;
}

/* === HERO / CHAPTER INTRO === */
.chapter-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: white;
  padding: 2.5rem 2rem;
  border-radius: var(--radius);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.chapter-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
}

.chapter-number {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.75;
  margin-bottom: 0.5rem;
}

.chapter-hero h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.chapter-hero .lead {
  font-size: 1rem;
  opacity: 0.9;
  max-width: 600px;
  line-height: 1.6;
}

/* === INDEX HERO === */
.index-hero {
  text-align: center;
  padding: 3rem 2rem;
  background: linear-gradient(135deg, #1a1a2e 0%, #2d1b69 50%, #1a1a2e 100%);
  color: white;
  border-radius: var(--radius);
  margin-bottom: 2.5rem;
}

.index-hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.index-hero .subtitle {
  font-size: 1.1rem;
  opacity: 0.85;
  max-width: 500px;
  margin: 0 auto 1.5rem;
}

/* === CHAPTER CARDS === */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.chapter-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--color-text);
  display: block;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.chapter-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.chapter-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
  color: var(--color-text);
  text-decoration: none;
}

.chapter-card-num {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.chapter-card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.chapter-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.chapter-card .topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 1rem;
}

.topic-tag {
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: 20px;
  font-weight: 500;
}

/* === QUIZ CTA === */
.quiz-cta {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-primary) 100%);
  color: white;
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  margin-top: 1rem;
  text-decoration: none;
  display: block;
  transition: transform var(--transition), box-shadow var(--transition);
}

.quiz-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: white;
  text-decoration: none;
}

.quiz-cta h2 {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.quiz-cta p {
  opacity: 0.9;
  font-size: 0.95rem;
}

/* === CONTENT TYPOGRAPHY === */
.content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.5rem 0 0.75rem;
  color: var(--color-text);
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-border);
  line-height: 1.3;
}

.content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
  color: var(--color-text);
  line-height: 1.3;
}

.content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--color-text);
}

.content p {
  margin-bottom: 1.25rem;
  max-width: 70ch;
}

.content ul, .content ol {
  margin: 0 0 1.25rem 1.5rem;
  max-width: 70ch;
}

.content li {
  margin-bottom: 0.4rem;
}

.content code {
  background: var(--color-accent-light);
  color: var(--color-accent);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: 'Courier New', monospace;
}

.content pre {
  background: var(--color-nav-bg);
  color: #c9d1d9;
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  line-height: 1.6;
  border: 1px solid var(--color-border);
}

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

/* === FACT BOX === */
.fact-box {
  background: var(--color-accent-light);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.fact-box strong {
  display: block;
  color: var(--color-accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}

.fact-box p {
  margin: 0;
  font-size: 0.95rem;
}

/* === INFO BOX === */
.info-box {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

[data-theme="dark"] .info-box {
  background: #0f1f3d;
  border-color: #1e3a6e;
}

.info-box strong {
  display: block;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* === KEY CONCEPTS === */
.key-concepts {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2rem 0;
}

.key-concepts h3 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin: 0 0 1rem;
  border: none;
  padding: 0;
}

.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.concept-item {
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
}

.concept-item strong {
  display: block;
  color: var(--color-primary);
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.concept-item p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.4;
}

/* === SUMMARY BOX === */
.summary-box {
  background: linear-gradient(135deg, var(--color-accent-light), #e0f2fe);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin: 2.5rem 0;
  border: 1px solid rgba(124,58,237,0.15);
}

[data-theme="dark"] .summary-box {
  background: linear-gradient(135deg, #2d1b5e, #0f1f3d);
}

.summary-box h3 {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin: 0 0 0.75rem;
  border: none;
  padding: 0;
}

.summary-box ul {
  margin: 0 0 0 1.25rem;
}

.summary-box li {
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

/* === SELF-TEST === */
.self-test {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2.5rem 0;
}

.self-test h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 1rem;
  border: none;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.self-test h3::before {
  content: '✏️';
}

.question-item {
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.question-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.question-text {
  font-weight: 600;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.options-list {
  list-style: none;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.option-btn {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  cursor: pointer;
  text-align: left;
  color: var(--color-text);
  transition: background var(--transition), border-color var(--transition);
  font-family: inherit;
  width: 100%;
}

.option-btn:hover:not(:disabled) {
  background: var(--color-accent-light);
  border-color: var(--color-accent);
}

.option-btn.correct {
  background: #d1fae5;
  border-color: var(--color-success);
  color: #065f46;
}

.option-btn.wrong {
  background: #fee2e2;
  border-color: var(--color-error);
  color: #7f1d1d;
}

[data-theme="dark"] .option-btn.correct {
  background: #064e3b;
  color: #a7f3d0;
}

[data-theme="dark"] .option-btn.wrong {
  background: #7f1d1d;
  color: #fecaca;
}

.facit {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--color-highlight);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  display: none;
}

.facit.visible {
  display: block;
}

/* === NAVIGATION === */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.nav-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.2rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-family: inherit;
}

.nav-btn:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent);
  transform: translateX(-2px);
  color: var(--color-text);
  text-decoration: none;
}

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

.nav-btn.home {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.nav-btn.home:hover {
  background: var(--color-primary-dark);
  color: white;
  transform: none;
}

/* === QUIZ STYLES === */
.quiz-wrapper {
  max-width: 700px;
  margin: 0 auto;
}

.quiz-progress {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.quiz-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--color-border);
  border-radius: 3px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 0.3s ease;
}

.quiz-counter {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.quiz-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
}

.quiz-chapter-tag {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.quiz-question {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.quiz-option {
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  cursor: pointer;
  text-align: left;
  color: var(--color-text);
  transition: all var(--transition);
  font-family: inherit;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.quiz-option .option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-border);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all var(--transition);
}

.quiz-option:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: #eff6ff;
}

[data-theme="dark"] .quiz-option:hover:not(:disabled) {
  background: #0f1f3d;
}

.quiz-option:hover:not(:disabled) .option-letter {
  background: var(--color-primary);
  color: white;
}

.quiz-option.selected {
  border-color: var(--color-primary);
  background: #eff6ff;
}

[data-theme="dark"] .quiz-option.selected {
  background: #0f1f3d;
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: #d1fae5;
}

[data-theme="dark"] .quiz-option.correct {
  background: #064e3b;
}

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

.quiz-option.wrong {
  border-color: var(--color-error);
  background: #fee2e2;
}

[data-theme="dark"] .quiz-option.wrong {
  background: #7f1d1d;
}

.quiz-option.wrong .option-letter {
  background: var(--color-error);
  color: white;
}

.quiz-explanation {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--color-highlight);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  display: none;
  line-height: 1.5;
}

[data-theme="dark"] .quiz-explanation {
  background: #2a2000;
  color: #fde68a;
}

.quiz-explanation.visible {
  display: block;
}

.quiz-next-btn {
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  margin-top: 1rem;
  transition: background var(--transition), transform var(--transition);
  font-family: inherit;
  display: none;
}

.quiz-next-btn.visible {
  display: block;
}

.quiz-next-btn:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

/* === QUIZ RESULT === */
.quiz-result {
  text-align: center;
  padding: 3rem 2rem;
  display: none;
}

.quiz-result.visible {
  display: block;
}

.result-score {
  font-size: 4rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.result-label {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.result-feedback {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.result-breakdown {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.result-stat {
  text-align: center;
}

.result-stat .stat-value {
  font-size: 2rem;
  font-weight: 700;
  display: block;
}

.result-stat .stat-value.green { color: var(--color-success); }
.result-stat .stat-value.red { color: var(--color-error); }

.result-stat .stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.quiz-restart-btn {
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin: 0 0.5rem;
  transition: background var(--transition);
  font-family: inherit;
}

.quiz-restart-btn:hover {
  background: var(--color-primary-dark);
}

.quiz-review {
  text-align: left;
  margin-top: 2rem;
  display: none;
}

.quiz-review.visible {
  display: block;
}

.review-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.review-item.correct { border-left: 4px solid var(--color-success); }
.review-item.wrong { border-left: 4px solid var(--color-error); }

.review-q {
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.review-a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* === BIONIC READING === */
.bionic-bold {
  font-weight: 800;
}

/* === SECTION DIVIDER === */
.section-divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
  margin: 2rem 0;
}

/* === BREADCRUMB === */
.breadcrumb {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb span {
  opacity: 0.5;
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
  :root { --font-size: 16px; }

  .header-inner {
    padding: 0.6rem 1rem;
    gap: 0.5rem;
  }

  .page-wrapper {
    padding: 1.5rem 1rem 3rem;
  }

  .chapter-hero h1 {
    font-size: 1.5rem;
  }

  .index-hero h1 {
    font-size: 1.75rem;
  }

  .a11y-toolbar {
    gap: 0.35rem;
  }

  .a11y-btn {
    padding: 0.25rem 0.4rem;
    font-size: 0.72rem;
  }

  .quiz-card {
    padding: 1.25rem;
  }

  .result-breakdown {
    gap: 1rem;
  }
}

@media (max-width: 400px) {
  .chapters-grid {
    grid-template-columns: 1fr;
  }
}

/* === PRINT === */
@media print {
  .site-header, .progress-bar, .chapter-nav, .a11y-toolbar { display: none !important; }
  .page-wrapper { max-width: none; padding: 0; }
}


/* ═══════════════════════════════════════════════════════════════
   ÖVNINGSMOTOR – stilar för interaktiva övningar
   ═══════════════════════════════════════════════════════════════ */

/* === ÖVNINGSSEKTION (ram runt varje övning) === */
.exercise {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2rem 0;
}

.exercise-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: white;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  padding: 0.25rem 0.7rem;
  border-radius: 20px;
  margin-bottom: 0.75rem;
}

.exercise h4 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem !important;
}

.exercise .instruction {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

/* === FLASHCARDS === */
.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0.9rem;
  margin: 1rem 0;
}

.flashcard {
  perspective: 800px;
  cursor: pointer;
  height: 130px;
  outline-offset: 3px;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s;
  transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1.4;
}

.flashcard-front {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: white;
  font-weight: 700;
  font-size: 0.95rem;
}

.flashcard-back {
  background: var(--color-accent-light);
  color: var(--color-text);
  transform: rotateY(180deg);
  border: 1px solid var(--color-border);
  overflow-y: auto;
}

/* === PARA IHOP === */
.match-game {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.6rem;
  margin: 1rem 0;
}

.match-item {
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.6rem;
  font-size: 0.82rem;
  line-height: 1.35;
  cursor: pointer;
  font-family: inherit;
  color: var(--color-text);
  transition: all var(--transition);
  min-height: 60px;
}

.match-item:hover:not(.matched) {
  border-color: var(--color-primary);
}

.match-item.selected {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  transform: scale(1.03);
}

.match-item.matched {
  background: #d1fae5;
  border-color: var(--color-success);
  color: #065f46;
  cursor: default;
}

[data-theme="dark"] .match-item.matched {
  background: #064e3b;
  color: #a7f3d0;
}

.match-status, .order-status {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  min-height: 1.2em;
}

.wrong-flash {
  animation: wrongshake 0.4s;
  border-color: var(--color-error) !important;
}

@keyframes wrongshake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

/* === LUCKTEXT === */
.cloze-input {
  border: 2px solid var(--color-border);
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
  font-size: 0.95em;
  font-family: inherit;
  background: var(--color-bg);
  color: var(--color-text);
  margin: 0 2px;
}

.cloze-input.correct {
  border-color: var(--color-success);
  background: #d1fae5;
  color: #065f46;
}

.cloze-input.wrong {
  border-color: var(--color-error);
  background: #fee2e2;
  color: #7f1d1d;
}

[data-theme="dark"] .cloze-input.correct { background:#064e3b; color:#a7f3d0; }
[data-theme="dark"] .cloze-input.wrong { background:#7f1d1d; color:#fecaca; }

.cloze-check {
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.75rem;
  font-family: inherit;
}

.cloze-check:hover { background: var(--color-primary-dark); }

.cloze-result {
  margin-top: 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* === SANT/FALSKT === */
.tf-item {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--color-border);
}

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

.tf-statement {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.tf-btn {
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 1.1rem;
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
  color: var(--color-text);
  margin-right: 0.5rem;
  transition: all var(--transition);
}

.tf-btn:hover:not(:disabled) { border-color: var(--color-primary); }
.tf-btn.correct { background: #d1fae5; border-color: var(--color-success); color: #065f46; }
.tf-btn.wrong { background: #fee2e2; border-color: var(--color-error); color: #7f1d1d; }
[data-theme="dark"] .tf-btn.correct { background:#064e3b; color:#a7f3d0; }
[data-theme="dark"] .tf-btn.wrong { background:#7f1d1d; color:#fecaca; }

.tf-explain {
  display: none;
  margin-top: 0.5rem;
  padding: 0.6rem 0.8rem;
  background: var(--color-highlight);
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
}

.tf-explain.visible { display: block; }

/* === SORTERA I ORDNING === */
.order-game {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 1rem 0;
}

.order-item {
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  font-size: 0.875rem;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: var(--color-text);
  transition: all var(--transition);
}

.order-item:hover:not(.matched) { border-color: var(--color-primary); }

.order-item.matched {
  background: #d1fae5;
  border-color: var(--color-success);
  color: #065f46;
  cursor: default;
}

[data-theme="dark"] .order-item.matched { background:#064e3b; color:#a7f3d0; }

.order-num {
  display: inline-flex;
  width: 22px;
  height: 22px;
  background: var(--color-success);
  color: white;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  margin-right: 0.3rem;
}

/* === REFLEKTIONSKORT (details) === */
.think-box {
  background: linear-gradient(135deg, #fff7ed, #fef3c7);
  border: 1px solid #fcd34d;
  border-radius: var(--radius-sm);
  padding: 0;
  margin: 1.5rem 0;
  overflow: hidden;
}

[data-theme="dark"] .think-box {
  background: linear-gradient(135deg, #2a2000, #3a2e00);
  border-color: #6b5900;
}

.think-box summary {
  cursor: pointer;
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  list-style: none;
  position: relative;
}

.think-box summary::before {
  content: '💭 ';
}

.think-box summary::marker { display: none; }

.think-box[open] summary {
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.think-box > *:not(summary) {
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  margin: 0;
}

/* === TIMELINE (för historiska översikter) === */
.timeline {
  position: relative;
  margin: 1.5rem 0;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-bottom: 1.25rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.68rem;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-primary);
}

.timeline-year {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 0.9rem;
}

.timeline-item p {
  margin: 0.2rem 0 0 !important;
  font-size: 0.9rem;
}

/* === JÄMFÖRELSETABELL === */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.compare-table th {
  background: var(--color-nav-bg);
  color: white;
  padding: 0.7rem 0.9rem;
  text-align: left;
  font-weight: 600;
}

.compare-table td {
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

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

.table-scroll { overflow-x: auto; }

/* === LÄRANDEMÅL-RUTA === */
.goals-box {
  background: var(--color-surface);
  border: 2px dashed var(--color-primary);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 0 0 2rem;
}

.goals-box h3 {
  font-size: 0.85rem !important;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin: 0 0 0.6rem !important;
  border: none !important;
  padding: 0 !important;
}

.goals-box ul { margin: 0 0 0 1.25rem; }
.goals-box li { font-size: 0.9rem; margin-bottom: 0.3rem; }