/* ============================================================
   FINLEARN — Interactive Finance Learning App
   Design System: Inspired by Stripe / Notion / Duolingo
   ============================================================ */

/* ── 1. RESET & BASE ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Brand Colors */
  --clr-primary:       #5B5FEF;
  --clr-primary-dark:  #4347CC;
  --clr-primary-light: #EEF0FF;
  --clr-accent:        #10B981;
  --clr-accent-dark:   #059669;
  --clr-accent-light:  #D1FAE5;
  --clr-red:           #EF4444;
  --clr-red-light:     #FEE2E2;
  --clr-yellow:        #F59E0B;
  --clr-yellow-light:  #FEF3C7;

  /* Neutrals */
  --clr-bg:            #F8F9FC;
  --clr-surface:       #FFFFFF;
  --clr-border:        #E5E7EB;
  --clr-text:          #111827;
  --clr-text-muted:    #6B7280;
  --clr-text-subtle:   #9CA3AF;

  /* Typography */
  --font-body:         'Inter', -apple-system, sans-serif;
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Radius */
  --radius-sm:  0.5rem;
  --radius-md:  0.875rem;
  --radius-lg:  1.25rem;
  --radius-xl:  1.75rem;
  --radius-2xl: 2.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-xl:  0 20px 60px rgba(0,0,0,0.12), 0 8px 24px rgba(0,0,0,0.08);
  --shadow-primary: 0 6px 24px rgba(91,95,239,0.35);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── 2. UTILITY ──────────────────────────────────────────── */
.hidden { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ── 3. APP SHELL ────────────────────────────────────────── */
.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* ── 4. PROGRESS HEADER ──────────────────────────────────── */
.progress-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  padding: var(--space-3) var(--space-6);
}

.progress-header__inner {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.chapter-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-primary);
  white-space: nowrap;
}

.stage-label {
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
  white-space: nowrap;
}

.progress-track {
  flex: 1;
  height: 8px;
  background: var(--clr-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-primary), #818CF8);
  border-radius: var(--radius-full);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-pct {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--clr-primary);
  min-width: 2.5rem;
  text-align: right;
}

/* ── 5. STAGE BASE ───────────────────────────────────────── */
.stage {
  display: none;
  flex: 1;
  animation: fadeSlideIn 0.45s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.stage--active { display: flex; flex-direction: column; }

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.stage__inner {
  width: 100%;
  margin: 0 auto;
  padding: var(--space-10) var(--space-6) var(--space-16);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.stage__inner--narrow { max-width: 680px; }
.stage__inner--wide   { max-width: 960px; }

.stage__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--clr-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stage__title {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--clr-text);
  text-align: center;
  line-height: 1.2;
}

.stage__subtitle {
  font-size: var(--text-lg);
  color: var(--clr-text-muted);
  text-align: center;
  max-width: 560px;
  line-height: 1.65;
}

/* ── 6. PODCAST STAGE ────────────────────────────────────── */
.stage--podcast { background: var(--clr-bg); }

.podcast-card {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding: var(--space-6) var(--space-6);
}

/* Episode header */
.podcast-header {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
}

.podcast-art {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--clr-primary), #818CF8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  box-shadow: var(--shadow-md);
}

.podcast-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex: 1;
}

.podcast-series {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--clr-primary);
}

.podcast-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--clr-text);
  line-height: 1.3;
}

.podcast-duration {
  font-size: var(--text-sm);
  color: var(--clr-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Player area */
.podcast-player {
  background: #F1F3FF;
  border: 1px solid rgba(91,95,239,0.12);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* Play / skip controls */
.player-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
}

.player-btn {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: var(--clr-text-muted);
  transition: var(--transition-fast);
  padding: var(--space-2);
  border-radius: var(--radius-md);
}

.player-btn:hover { color: var(--clr-primary); background: rgba(91,95,239,0.08); }

.player-btn--skip { font-size: 1.1rem; }
.player-btn--skip span {
  font-size: 0.6rem;
  font-weight: 700;
  font-family: var(--font-body);
  line-height: 1;
  margin-top: -2px;
}

.player-btn--play {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--clr-primary);
  color: white;
  font-size: 1.2rem;
  box-shadow: var(--shadow-primary);
  padding: 0;
  justify-content: center;
  flex-direction: row;
}

.player-btn--play:hover {
  background: var(--clr-primary-dark);
  transform: scale(1.06);
  color: white;
}

/* Timeline */
.player-timeline {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.player-time {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--clr-text-muted);
  min-width: 2.5rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.player-track {
  flex: 1;
  height: 6px;
  background: rgba(91,95,239,0.15);
  border-radius: var(--radius-full);
  position: relative;
  cursor: pointer;
  overflow: visible;
}

.player-track__fill {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--clr-primary);
  border-radius: var(--radius-full);
  width: 0%;
  transition: width 0.25s linear;
}

.player-track__thumb {
  position: absolute;
  top: 50%;
  left: 0%;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  background: var(--clr-primary);
  border: 2px solid white;
  box-shadow: 0 1px 4px rgba(91,95,239,0.4);
  transform: translate(-50%, -50%);
  transition: left 0.25s linear;
}

/* Speed + Volume row */
.player-extras {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.player-extras__label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-text-muted);
  margin-right: var(--space-2);
}

.player-speed {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.speed-btns {
  display: flex;
  gap: 4px;
}

.speed-btn {
  padding: 4px 10px;
  font-size: var(--text-xs);
  font-weight: 600;
  font-family: var(--font-body);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
}

.speed-btn:hover { border-color: var(--clr-primary); color: var(--clr-primary); }

.speed-btn--active {
  background: var(--clr-primary);
  color: white;
  border-color: var(--clr-primary);
}

.player-volume {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--clr-text-muted);
  font-size: 1rem;
}

.player-volume i { cursor: pointer; transition: color var(--transition-fast); }
.player-volume i:hover { color: var(--clr-primary); }

.volume-slider {
  -webkit-appearance: none;
  width: 80px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--clr-border);
  outline: none;
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-primary);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* Episode chapters */
.podcast-chapters {
  border-top: 1px solid var(--clr-border);
  padding-top: var(--space-4);
}

.podcast-chapters__title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.chapter-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.chapter-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-fast);
}

.chapter-item:hover { background: var(--clr-primary-light); }

.chapter-item--active {
  background: var(--clr-primary-light);
  border-left: 3px solid var(--clr-primary);
}

.chapter-time {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--clr-primary);
  min-width: 2.5rem;
  font-variant-numeric: tabular-nums;
}

.chapter-name {
  font-size: var(--text-sm);
  color: var(--clr-text);
  font-weight: 500;
}

/* Transcript */
.transcript-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.transcript-body {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  animation: fadeSlideIn 0.3s ease forwards;
}

.transcript-body p {
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--clr-text);
}

.transcript-body p strong {
  color: var(--clr-primary);
  font-weight: 700;
}

/* Pulse animation for done button after audio ends */
@keyframes pulseCTA {
  0%, 100% { box-shadow: var(--shadow-primary); }
  50% { box-shadow: 0 0 0 8px rgba(91,95,239,0.18), var(--shadow-primary); }
}

.podcast-done--pulse {
  animation: pulseCTA 1.6s ease infinite;
}

/* ── 7. VIDEO STAGE ──────────────────────────────────────── */
.stage--video { background: var(--clr-bg); }

.video-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: #000;
}

.video-wrapper iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-meta {
  display: flex;
  gap: var(--space-5);
  justify-content: center;
  font-size: var(--text-sm);
  color: var(--clr-text-muted);
}

.video-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.key-concepts {
  width: 100%;
  background: var(--clr-primary-light);
  border: 1px solid rgba(91,95,239,0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
}

.key-concepts__title {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-primary);
  margin-bottom: var(--space-3);
}

.concept-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.concept-list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  color: var(--clr-text);
  font-weight: 500;
}

.concept-list li i { color: var(--clr-primary); font-size: var(--text-sm); }

/* ── 8. QUIZ STAGE ───────────────────────────────────────── */
.stage--quiz { background: var(--clr-bg); }

.quiz-dots {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
}

.quiz-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--clr-border);
  transition: var(--transition-base);
}

.quiz-dot--active   { background: var(--clr-primary); transform: scale(1.3); }
.quiz-dot--correct  { background: var(--clr-accent); }
.quiz-dot--wrong    { background: var(--clr-red); }

.quiz-card {
  width: 100%;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-8);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.quiz-question {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--clr-text);
  line-height: 1.4;
}

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

.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-md);
  background: var(--clr-surface);
  cursor: pointer;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--clr-text);
  text-align: left;
  transition: var(--transition-fast);
  width: 100%;
}

.quiz-option:hover:not(:disabled) {
  border-color: var(--clr-primary);
  background: var(--clr-primary-light);
  color: var(--clr-primary-dark);
}

.quiz-option--correct {
  border-color: var(--clr-accent) !important;
  background: var(--clr-accent-light) !important;
  color: var(--clr-accent-dark) !important;
}

.quiz-option--wrong {
  border-color: var(--clr-red) !important;
  background: var(--clr-red-light) !important;
  color: var(--clr-red) !important;
}

.quiz-option__letter {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--clr-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
  flex-shrink: 0;
  transition: var(--transition-fast);
}

.quiz-option--correct .quiz-option__letter { background: var(--clr-accent); color: #fff; }
.quiz-option--wrong   .quiz-option__letter { background: var(--clr-red); color: #fff; }

.quiz-explanation {
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-sm);
  line-height: 1.65;
  font-weight: 500;
  animation: fadeSlideIn 0.3s ease forwards;
}

.quiz-explanation--correct {
  background: var(--clr-accent-light);
  color: var(--clr-accent-dark);
  border-left: 4px solid var(--clr-accent);
}

.quiz-explanation--wrong {
  background: var(--clr-red-light);
  color: #B91C1C;
  border-left: 4px solid var(--clr-red);
}

.quiz-explanation i { margin-right: var(--space-2); }

/* ── 9. LAB STAGE ────────────────────────────────────────── */
.stage--lab { background: var(--clr-bg); }

.lab-layout {
  width: 100%;
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: var(--space-6);
  align-items: start;
}

.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.card__title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.input-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-2);
  margin-top: var(--space-4);
}

.input-label:first-of-type { margin-top: 0; }

.text-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--clr-text);
  background: var(--clr-bg);
  transition: var(--transition-fast);
  margin-bottom: var(--space-2);
}

.text-input:focus {
  outline: none;
  border-color: var(--clr-primary);
  background: var(--clr-surface);
  box-shadow: 0 0 0 3px rgba(91,95,239,0.12);
}

.lab-tip {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--clr-yellow-light);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: #92400E;
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.lab-tip i { color: var(--clr-yellow); flex-shrink: 0; margin-top: 2px; }
.lab-tip code { background: rgba(0,0,0,0.08); padding: 0.1em 0.4em; border-radius: 0.25em; font-size: 0.9em; }

.lab-results-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.results-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.result-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-10);
  border: 2px dashed var(--clr-border);
  border-radius: var(--radius-xl);
  color: var(--clr-text-subtle);
  text-align: center;
  font-size: var(--text-sm);
}

.result-placeholder i { font-size: 1.5rem; }

.result-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  animation: fadeSlideIn 0.35s ease forwards;
}

.result-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.result-card__icon--primary { background: var(--clr-primary-light); color: var(--clr-primary); }
.result-card__icon--accent  { background: var(--clr-accent-light);  color: var(--clr-accent); }
.result-card__icon--yellow  { background: var(--clr-yellow-light);  color: var(--clr-yellow); }
.result-card__icon--red     { background: var(--clr-red-light);     color: var(--clr-red); }

.result-card__body { flex: 1; }
.result-card__label { font-size: var(--text-xs); font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; color: var(--clr-text-muted); }
.result-card__value { font-size: var(--text-2xl); font-weight: 800; color: var(--clr-text); line-height: 1.2; }
.result-card__note  { font-size: var(--text-xs); color: var(--clr-text-muted); margin-top: 2px; }

.chart-section { width: 100%; }

/* ── 10. FLASHCARDS ──────────────────────────────────────── */
.stage--flashcards { background: var(--clr-bg); }

.flashcard-counter {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--clr-text-muted);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
}

.flashcard-scene {
  width: 100%;
  max-width: 560px;
  perspective: 1200px;
}

.flashcard {
  width: 100%;
  min-height: 280px;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-xl);
  position: relative;
}

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

.flashcard__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.flashcard__face--front {
  background: linear-gradient(135deg, var(--clr-primary), #818CF8);
  color: white;
  gap: var(--space-4);
}

.flashcard__face--back {
  background: var(--clr-surface);
  border: 2px solid var(--clr-border);
  transform: rotateY(180deg);
  gap: var(--space-4);
}

.flashcard__hint {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.7;
}

.flashcard__term {
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1.2;
}

.flashcard__definition {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--clr-text);
  line-height: 1.45;
}

.flashcard__example {
  font-size: var(--text-sm);
  color: var(--clr-text-muted);
  font-style: italic;
  border-top: 1px solid var(--clr-border);
  padding-top: var(--space-3);
  margin-top: var(--space-2);
  width: 100%;
}

.flashcard-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  width: 100%;
  max-width: 560px;
  justify-content: space-between;
}

.fc-dots {
  display: flex;
  gap: var(--space-2);
}

.fc-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--clr-border);
  transition: var(--transition-base);
}

.fc-dot--active   { background: var(--clr-primary); width: 20px; }
.fc-dot--viewed   { background: var(--clr-accent); }

/* ── 11. REFLECTION ──────────────────────────────────────── */
.stage--reflection { background: var(--clr-bg); }

.reflection-card {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.reflection-prompt {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  padding: var(--space-5);
  background: var(--clr-primary-light);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--clr-primary);
}

.reflection-prompt i {
  color: var(--clr-primary);
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.reflection-prompt p {
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--clr-text);
}

.reflection-textarea {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-bg);
  resize: vertical;
  transition: var(--transition-fast);
}

.reflection-textarea:focus {
  outline: none;
  border-color: var(--clr-primary);
  background: var(--clr-surface);
  box-shadow: 0 0 0 3px rgba(91,95,239,0.12);
}

.reflection-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--clr-text-muted);
}

.char-count span { font-weight: 700; color: var(--clr-text); }
.reflection-tip  { display: flex; align-items: center; gap: var(--space-2); }

/* ── 12. COMPLETION STAGE ────────────────────────────────── */
.stage--complete {
  background: linear-gradient(135deg, #F0F2FF 0%, #F8F9FC 60%, #ECFDF5 100%);
  min-height: 100vh;
}

.completion-badge {
  display: flex;
  align-items: center;
  justify-content: center;
}

.completion-badge__ring {
  width: 90px;
  height: 90px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--clr-primary), #818CF8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: white;
  box-shadow: var(--shadow-primary);
  animation: popIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes popIn {
  from { transform: scale(0.3); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.completion__title { font-size: var(--text-4xl); }

/* Progress Ring SVG */
.completion-progress {
  position: relative;
  width: 160px;
  height: 160px;
}

.progress-ring { width: 100%; height: 100%; transform: rotate(-90deg); }
.progress-ring__bg   { fill: none; stroke: var(--clr-border); stroke-width: 10; }
.progress-ring__fill {
  fill: none;
  stroke: url(#ring-gradient);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.5s cubic-bezier(0.4, 0, 0.2, 1);
  stroke: var(--clr-primary);
}

.progress-ring__label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.progress-ring__pct {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--clr-primary);
  line-height: 1;
}

.progress-ring__sub {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.completion-summary {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.summary-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--clr-text);
  animation: fadeSlideIn 0.4s ease forwards;
}

.summary-item > i:first-child { color: var(--clr-primary); width: 20px; text-align: center; }
.summary-item > span { flex: 1; }
.summary-check { color: var(--clr-accent); font-size: 1.1rem; }

.completion-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
}

/* ── 13. BUTTONS ─────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 700;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* Sizes */
.btn--xl  { padding: 1rem 2.2rem; font-size: var(--text-xl); border-radius: var(--radius-lg); }
.btn--lg  { padding: 0.875rem 2rem; font-size: var(--text-lg); }
.btn--md  { padding: 0.65rem 1.4rem; font-size: var(--text-base); }
.btn--sm  { padding: 0.45rem 1rem; font-size: var(--text-sm); }

/* Variants */
.btn--primary {
  background: var(--clr-primary);
  color: white;
  box-shadow: var(--shadow-primary);
}

.btn--primary:hover:not(:disabled) {
  background: var(--clr-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(91,95,239,0.45);
}

.btn--primary:active { transform: translateY(0); }

.btn--accent {
  background: var(--clr-accent);
  color: white;
  box-shadow: 0 4px 16px rgba(16,185,129,0.3);
}

.btn--accent:hover:not(:disabled) {
  background: var(--clr-accent-dark);
  transform: translateY(-2px);
}

.btn--secondary {
  background: var(--clr-primary-light);
  color: var(--clr-primary);
  border: 2px solid rgba(91,95,239,0.2);
}

.btn--secondary:hover:not(:disabled) {
  background: #DDE0FF;
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--clr-text-muted);
  border: 2px solid var(--clr-border);
}

.btn--ghost:hover:not(:disabled) {
  background: var(--clr-surface);
  border-color: var(--clr-text-muted);
  color: var(--clr-text);
}

/* Quiz next button alignment */
.quiz-next-btn { align-self: flex-end; }

/* ── 14. RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 768px) {
  .stage__inner { padding: var(--space-8) var(--space-4) var(--space-12); }
  .stage__title { font-size: var(--text-2xl); }
  .stage__subtitle { font-size: var(--text-base); }

  .podcast-header { flex-direction: column; align-items: center; text-align: center; }
  .podcast-art { width: 64px; height: 64px; font-size: 1.5rem; }
  .podcast-title { font-size: var(--text-base); }
  .player-extras { justify-content: center; }
  .volume-slider { width: 60px; }

  .lab-layout { grid-template-columns: 1fr; }

  .quiz-card { padding: var(--space-5) var(--space-4); }

  .flashcard { min-height: 240px; }
  .flashcard__term { font-size: var(--text-xl); }
  .flashcard__definition { font-size: var(--text-base); }

  .btn--xl { padding: 0.875rem 1.75rem; font-size: var(--text-lg); }
  .btn--lg { padding: 0.75rem 1.5rem; font-size: var(--text-base); }

  .progress-header { padding: var(--space-2) var(--space-4); }

  .completion__title { font-size: var(--text-3xl); }
  .completion-badge__ring { width: 72px; height: 72px; font-size: 2rem; }

  .summary-item { padding: var(--space-3) var(--space-4); font-size: var(--text-sm); }

  .flashcard-nav { gap: var(--space-3); }
}

@media (max-width: 480px) {
  .hook__facts { gap: var(--space-2); }
  .fact-pill { font-size: var(--text-xs); }
  .result-card { flex-direction: column; align-items: flex-start; }
  .quiz-card { border-radius: var(--radius-lg); }
}

/* ── 15. EMBED MODE (Podia iframe) ───────────────────────── */
@media (max-height: 700px) {
  .stage--podcast { min-height: auto; }
}

/* Smooth scroll for embedded use */
html { overflow-y: auto; }