/* ═══════════════════════════════════════════════
   Academy UX Enhancement — Option B
   Layered on top of existing academy styles.
   Adds: reading progress, smooth transitions,
   completion animations, mobile polish.
   ═══════════════════════════════════════════════ */

/* ── Reading Progress Bar (top of viewport) ── */
#reading-progress {
  position: fixed;
  top: 52px; /* below nav */
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent, #7A5C11), var(--green, #2D8C4E));
  z-index: 999;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ── Smooth Page Transitions ── */
#app {
  animation: acFadeIn 0.35s ease-out;
}
@keyframes acFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Module Cards: Enhanced Hover + Tier Badges ── */
.module-card {
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.module-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(61, 46, 34, 0.1);
}
[data-theme="dark"] .module-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.badge-free {
  background: rgba(45, 140, 78, 0.12);
  color: var(--green);
  border: 1px solid rgba(45, 140, 78, 0.2);
  font-size: 0.7rem;
  letter-spacing: 1px;
  padding: 3px 10px;
  border-radius: 20px;
}
.badge-premium {
  background: linear-gradient(135deg, rgba(180, 133, 21, 0.15), rgba(139, 105, 20, 0.1));
  color: var(--amber, #B08515);
  border: 1px solid rgba(180, 133, 21, 0.25);
  font-size: 0.7rem;
  letter-spacing: 1px;
  padding: 3px 10px;
  border-radius: 20px;
}

/* ── Lesson Card: Completion Animation ── */
.lesson-checkbox {
  transition: all 0.25s ease;
}
.lesson-checkbox.checked {
  background: var(--green) !important;
  border-color: var(--green) !important;
  color: #fff !important;
  transform: scale(1);
  animation: acCheckPop 0.3s ease;
}
@keyframes acCheckPop {
  0% { transform: scale(0.8); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* ── Lesson View: Reading Typography ── */
.lesson-content {
  max-width: 720px;
  margin: 0 auto;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text);
}
.lesson-content h2,
.lesson-content h3 {
  margin-top: 2em;
  margin-bottom: 0.6em;
  color: var(--text);
  font-weight: 700;
  line-height: 1.3;
}
.lesson-content h2 { font-size: 1.5rem; }
.lesson-content h3 { font-size: 1.2rem; }
.lesson-content h4 { font-size: 1.05rem; margin-top: 1.5em; font-weight: 600; }
.lesson-content p {
  margin-bottom: 1.1em;
  color: var(--text2);
}
.lesson-content strong {
  color: var(--text);
  font-weight: 600;
}
.lesson-content ul, .lesson-content ol {
  margin: 0.8em 0 1.2em 1.5em;
  color: var(--text2);
}
.lesson-content li {
  margin-bottom: 0.4em;
  line-height: 1.7;
}
.lesson-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88em;
  background: var(--surface-alt);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-light);
}
.lesson-content pre {
  background: var(--surface-alt);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  margin: 1.2em 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  line-height: 1.6;
}
.lesson-content pre code {
  background: none;
  border: none;
  padding: 0;
}
.lesson-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 12px 20px;
  margin: 1.2em 0;
  background: var(--surface-alt);
  border-radius: 0 8px 8px 0;
  color: var(--text2);
  font-style: italic;
}
.lesson-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  font-size: 0.9em;
}
.lesson-content th,
.lesson-content td {
  padding: 10px 14px;
  border: 1px solid var(--border-light);
  text-align: left;
}
.lesson-content th {
  background: var(--surface-alt);
  font-weight: 600;
  color: var(--text);
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.lesson-content hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 2em 0;
}

/* ── Navigation Buttons: Larger Tap Targets ── */
.nav-button {
  min-width: 100px;
  min-height: 44px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.2s ease;
}
.nav-button:hover:not(:disabled) {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.nav-button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ── Mark Complete Button: Enhanced ── */
.lesson-actions .btn-primary {
  min-height: 48px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 10px;
  letter-spacing: 0.02em;
  transition: all 0.2s ease;
}
.lesson-actions .btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(139, 105, 20, 0.25);
}

/* ── Progress Bar: Smoother Animation ── */
.progress-fill {
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.progress-mini-fill {
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Quiz: Better Touch Targets ── */
.quiz-option {
  min-height: 48px;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}
.quiz-option:hover {
  transform: translateX(4px);
  border-color: var(--accent);
}

/* ── Back Button: More Accessible ── */
.back-button {
  min-height: 40px;
  font-size: 0.9rem;
  transition: all 0.15s ease;
}
.back-button:hover {
  transform: translateX(-2px);
}

/* ── Keyboard Navigation Hint ── */
.keyboard-hint {
  position: fixed;
  bottom: 16px;
  right: 16px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 11px;
  color: var(--text2);
  font-family: 'JetBrains Mono', monospace;
  opacity: 0.6;
  pointer-events: none;
  z-index: 100;
}
.keyboard-hint kbd {
  display: inline-block;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 10px;
  margin: 0 2px;
}

/* ── Mobile: Improved Reading ── */
@media (max-width: 768px) {
  .lesson-content {
    font-size: 15px;
    line-height: 1.8;
    padding: 0 4px;
  }
  .lesson-content h2 { font-size: 1.3rem; }
  .lesson-content h3 { font-size: 1.1rem; }
  .nav-button {
    min-width: 80px;
    min-height: 48px;
    font-size: 0.85rem;
  }
  .lesson-actions .btn-primary {
    min-height: 52px;
    font-size: 1.05rem;
  }
  .keyboard-hint { display: none; }
  .hero h1 { font-size: 2rem; }
  .module-title-section h3 { font-size: 1.2rem; }
  .back-button { min-height: 44px; }
}

@media (max-width: 480px) {
  .lesson-content {
    font-size: 14.5px;
  }
  .lesson-nav {
    flex-direction: column;
    gap: 8px;
  }
  .nav-button {
    width: 100%;
    justify-content: center;
  }
}