/* ============================================================
   ReadAlong — shared stylesheet for research-perspectives docs
   Consumes existing design tokens (--amber, --cyan, --purple,
   --bg-*, --text-*, --font-*, --radius-*). Do NOT redeclare.
   ============================================================ */

/* ─── Word tokens inside narrative blocks ──────────────────── */
.readalong-narrative .w {
  display: inline;
  padding: 1px 2px;
  margin: 0 -1px;
  border-radius: 3px;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
  cursor: pointer;
}
.readalong-narrative .w:hover {
  background: color-mix(in srgb, var(--cyan) 14%, transparent);
}
/* Active word — verbatim from courses prototype */
.readalong-narrative .w.active {
  background: rgba(240, 168, 48, 0.22);
  color: #fff;
}
[data-theme="light"] .readalong-narrative .w.active {
  background: rgba(240, 168, 48, 0.42);
  color: #351C0D;
}
.readalong-narrative.has-hints .w {
  border-bottom: 1px dotted color-mix(in srgb, var(--cyan) 35%, transparent);
}

/* ─── Loupe — verbatim from courses ios-loupe-genie.html ─────
   (position:absolute → position:fixed because her-os has no single
   parent wrap; all other properties are identical character-for-character.) */
.ra-lens {
  position: fixed;
  left: 0;
  top: 0;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  box-sizing: border-box;
  padding: 4px 14px;
  background: linear-gradient(180deg,
    rgba(255, 255, 255, 0.22) 0%,
    rgba(255, 255, 255, 0.06) 100%);
  backdrop-filter: blur(18px) saturate(1.6);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  border: 0.5px solid rgba(255, 255, 255, 0.34);
  box-shadow:
    0 10px 24px rgba(0, 0, 0, 0.55),
    0 2px 4px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.36);
  color: #f0a830;
  font-family: 'DM Sans', -apple-system, sans-serif;
  font-size: 1.42em;
  font-weight: 700;
  letter-spacing: 0.015em;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
  white-space: nowrap;
  transition:
    left 0.25s cubic-bezier(0.34, 1.25, 0.64, 1),
    top 0.25s ease,
    opacity 0.2s;
  opacity: 0;
  z-index: 20;
}
.ra-lens.visible { opacity: 1; }

/* ─── Genie — verbatim from courses ios-loupe-genie.html ─────
   (position:absolute → position:fixed for doc-level scope.
   Gradient + stroke live on the <path> attributes, not CSS.) */
.ra-genie {
  position: fixed;
  left: 0;
  top: 0;
  pointer-events: none;
  z-index: 19;
  opacity: 0;
  transition: opacity 0.15s;
}
.ra-genie.visible { opacity: 1; }

/* ─── Sticky bottom player ─────────────────────────────────── */
.ra-player {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 9400;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
  padding: 12px 24px;
  background: color-mix(in srgb, var(--bg-deep) 92%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-top: 1px solid var(--border-light);
  font-family: var(--font-mono);
  font-size: 12px;
  transform: translateY(100%);
  transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.3, 1.1);
}
.ra-player.active {
  transform: translateY(0);
}
.ra-player-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 240px;
}
.ra-player-title {
  color: var(--text-bright);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 240px;
}
.ra-player-lens-tag {
  color: var(--amber);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  display: block;
  margin-bottom: 2px;
}
.ra-player-center {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: stretch;
}
.ra-player-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.ra-ctrl {
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.18s ease;
  font-size: 13px;
  line-height: 1;
}
.ra-ctrl:hover {
  border-color: var(--amber-border);
  color: var(--amber);
  background: var(--amber-glow);
}
.ra-ctrl.ra-ctrl-primary {
  width: 40px;
  height: 40px;
  background: var(--amber);
  border-color: var(--amber);
  color: var(--bg-deep);
  font-weight: 700;
  font-size: 14px;
}
.ra-ctrl.ra-ctrl-primary:hover {
  background: var(--amber-soft);
  transform: scale(1.05);
}
.ra-ctrl:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}
.ra-progress {
  display: flex;
  align-items: center;
  gap: 10px;
}
.ra-progress-bar {
  flex: 1;
  height: 4px;
  background: var(--bg-surface);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
  cursor: pointer;
}
.ra-progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 0%;
  background: linear-gradient(90deg, var(--amber) 0%, var(--cyan) 100%);
  border-radius: 2px;
  transition: width 0.12s linear;
}
.ra-progress-time {
  color: var(--text-muted);
  font-size: 10px;
  min-width: 36px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.ra-player-right {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 200px;
  justify-content: flex-end;
}
.ra-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  border-radius: 14px;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease;
  appearance: none;
  -webkit-appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--text-muted) 50%),
    linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
  background-position:
    calc(100% - 14px) 50%,
    calc(100% - 10px) 50%;
  background-size: 4px 4px, 4px 4px;
  background-repeat: no-repeat;
  padding-right: 24px;
}
.ra-select:hover {
  border-color: var(--amber-border);
  color: var(--amber);
}

/* ─── Settings modal ───────────────────────────────────────── */
.ra-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9700;
  background: rgba(6, 6, 15, 0.82);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, visibility 0s linear 0.25s;
}
.ra-modal-overlay.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 0.25s ease, visibility 0s linear 0s;
}
[data-theme="light"] .ra-modal-overlay {
  background: rgba(6, 6, 15, 0.55);
}
.ra-modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 32px;
  font-family: var(--font-body);
  color: var(--text-primary);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.55);
  animation: raSlideIn 0.3s cubic-bezier(0.2, 0.9, 0.3, 1.1);
}
.ra-modal h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 6px;
}
.ra-modal-sub {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}
.ra-field {
  margin-bottom: 18px;
}
.ra-field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 7px;
}
.ra-input {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  color: var(--text-bright);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  transition: border-color 0.18s ease;
}
.ra-input:focus {
  border-color: var(--amber-border);
}

/* Inline auth-error banner, shown above the API key input when a bad
   key was just rejected by Google */
.ra-auth-banner {
  display: none;
  margin-bottom: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--coral-glow);
  border: 1px solid var(--coral-border);
  color: var(--coral);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
}
.ra-auth-banner.visible {
  display: block;
  animation: raFadeIn 0.25s ease;
}
[data-theme="light"] .ra-auth-banner {
  color: #8a2e1a;
}
.ra-modal .ra-select {
  width: 100%;
  padding: 10px 32px 10px 14px;
  font-size: 13px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
}
.ra-modal-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.ra-modal-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
  line-height: 1.5;
}
.ra-modal-hint a {
  color: var(--cyan);
  text-decoration: none;
}
.ra-modal-hint a:hover {
  text-decoration: underline;
}
.ra-modal-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.ra-btn {
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.5px;
  cursor: pointer;
  border: 1px solid var(--border-light);
  background: transparent;
  color: var(--text-secondary);
  transition: all 0.18s ease;
}
.ra-btn:hover {
  border-color: var(--amber-border);
  color: var(--amber);
}
.ra-btn-primary {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--bg-deep);
  font-weight: 700;
}
.ra-btn-primary:hover {
  background: var(--amber-soft);
  color: var(--bg-deep);
}
.ra-btn-danger {
  border-color: var(--coral-border);
  color: var(--coral);
}
.ra-btn-danger:hover {
  background: var(--coral-glow);
  color: var(--coral);
  border-color: var(--coral);
}
.ra-modal-footer {
  display: flex;
  gap: 8px;
}

/* ─── Per-section play button (existing .tts-btn enhancement) ─ */
.tts-btn {
  position: relative;
  float: right;
  margin-top: -4px;
}
.tts-btn.ra-playing {
  background: var(--amber);
  color: var(--bg-deep);
  border-color: var(--amber);
}
.tts-btn.ra-playing::after {
  content: '';
  position: absolute;
  inset: -2px;
  border: 2px solid var(--amber);
  border-radius: inherit;
  animation: raPulse 1.2s ease-in-out infinite;
}
.tts-btn.ra-loading {
  opacity: 0.7;
  cursor: wait;
}
.tts-btn.ra-loading::after {
  content: '';
  position: absolute;
  inset: -2px;
  border: 2px solid var(--cyan-border);
  border-top-color: var(--cyan);
  border-radius: inherit;
  animation: raSpin 0.8s linear infinite;
}
.ra-ctrl.ra-loading {
  cursor: wait;
  opacity: 0.6;
}

/* ─── Play-all indicator pill ──────────────────────────────── */
.ra-play-all-badge {
  display: none;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--amber);
  background: var(--amber-glow);
  border: 1px solid var(--amber-border);
  padding: 2px 8px;
  border-radius: 10px;
  margin-right: 6px;
}
.ra-player.ra-play-all .ra-play-all-badge {
  display: inline-block;
}

/* ─── Voice preview button inside Settings modal ───────────── */
.ra-voice-preview {
  margin-top: 6px;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--cyan-border);
  color: var(--cyan);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  transition: background 0.18s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.ra-voice-preview:hover {
  background: var(--cyan-glow);
}
.ra-voice-preview[disabled] {
  opacity: 0.5;
  cursor: wait;
}

/* ─── Nav-dot playback sync ────────────────────────────────── */
.nav-dot.ra-dot-playing {
  background: var(--amber) !important;
  box-shadow: 0 0 14px var(--amber-glow);
  transform: scale(1.5);
  animation: raDotPulse 1.4s ease-in-out infinite;
}

/* ─── "Follow along" re-center peek on Player when user scrolled ─ */
.ra-follow-along {
  position: absolute;
  top: -36px;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--bg-elevated);
  border: 1px solid var(--amber-border);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 6px 14px;
  border-radius: 18px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}
.ra-player.ra-drifted .ra-follow-along {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* ─── Dim lens-number badge on currently-playing section ───── */
.lens.ra-section-playing .lens-number {
  opacity: 0.4;
  transition: opacity 0.3s ease;
}

/* ─── Floating book icon — persistent ReadAlong toggle ──────── */
.ra-book-toggle {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 9300;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--bg-elevated) 94%, transparent) 0%,
    color-mix(in srgb, var(--bg-surface) 86%, transparent) 100%
  );
  backdrop-filter: blur(16px) saturate(1.3);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  border: 1px solid var(--amber-border);
  color: var(--amber);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 6px 20px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset,
    0 0 24px var(--amber-glow);
  transition: transform 0.22s cubic-bezier(0.2, 0.9, 0.3, 1.15),
              box-shadow 0.22s ease,
              background 0.22s ease;
  -webkit-tap-highlight-color: transparent;
}
.ra-book-toggle:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow:
    0 10px 28px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.06) inset,
    0 0 34px var(--amber-glow);
}
.ra-book-toggle:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 4px;
}
.ra-book-toggle.ra-playing {
  color: var(--bg-deep);
  background: linear-gradient(
    135deg,
    var(--amber) 0%,
    var(--amber-soft) 100%
  );
  border-color: var(--amber);
}
.ra-book-toggle.ra-playing::before {
  content: '';
  position: absolute;
  inset: -4px;
  border: 2px solid var(--amber);
  border-radius: 50%;
  animation: raBookPulse 1.6s ease-in-out infinite;
}
.ra-book-toggle.ra-loading::after {
  content: '';
  position: absolute;
  inset: -3px;
  border: 2px solid transparent;
  border-top-color: var(--cyan);
  border-radius: 50%;
  animation: raSpin 0.9s linear infinite;
}
.ra-book-toggle-label {
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 14px;
  border: 1px solid var(--border-light);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.ra-book-toggle:hover .ra-book-toggle-label {
  opacity: 1;
  transform: translateY(-50%) translateX(-4px);
}

/* When the player is open on mobile, shift the book-icon above it */
@media (max-width: 700px) {
  body.ra-playing-active .ra-book-toggle {
    bottom: 130px;
  }
}
@media (min-width: 701px) {
  body.ra-playing-active .ra-book-toggle {
    bottom: 88px;
  }
}

@keyframes raBookPulse {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50%      { opacity: 0;   transform: scale(1.35); }
}

[data-theme="light"] .ra-book-toggle {
  background: linear-gradient(
    135deg,
    rgba(245, 224, 210, 0.94) 0%,
    rgba(232, 194, 169, 0.86) 100%
  );
  border-color: color-mix(in srgb, var(--amber) 45%, transparent);
  box-shadow:
    0 6px 20px rgba(64, 41, 19, 0.25),
    0 0 0 1px rgba(255, 255, 255, 0.35) inset,
    0 0 24px color-mix(in srgb, var(--amber) 18%, transparent);
}
[data-theme="light"] .ra-book-toggle.ra-playing {
  color: #fff;
}

@media (prefers-reduced-motion: reduce) {
  .ra-book-toggle,
  .ra-book-toggle::before,
  .ra-book-toggle::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ─── Toast notifications ──────────────────────────────────── */
.ra-toast {
  position: fixed;
  bottom: 88px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  z-index: 9800;
  background: var(--bg-elevated);
  border: 1px solid var(--coral-border);
  color: var(--text-bright);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 12px;
  max-width: 520px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}
.ra-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.ra-toast.error {
  border-color: var(--coral-border);
}
.ra-toast.info {
  border-color: var(--cyan-border);
}

/* ─── Keyframes ────────────────────────────────────────────── */
@keyframes raFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes raSlideIn {
  from { opacity: 0; transform: translateY(16px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes raPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 0; transform: scale(1.25); }
}
@keyframes raSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes raDotPulse {
  0%, 100% { box-shadow: 0 0 14px var(--amber-glow); }
  50% { box-shadow: 0 0 24px var(--amber); }
}

/* ─── Responsive: hide loupe + genie on narrow viewports ───── */
@media (max-width: 700px) {
  .ra-lens,
  .ra-genie {
    display: none !important;
  }
  .ra-player {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 10px 16px;
  }
  .ra-player-left,
  .ra-player-right {
    min-width: 0;
    justify-content: space-between;
  }
  .ra-player-right {
    gap: 6px;
  }
  .ra-player-right .ra-select {
    display: none;
  }
  body.ra-playing-active {
    padding-bottom: 110px;
  }
}

@media (min-width: 701px) {
  body.ra-playing-active {
    padding-bottom: 80px;
  }
}

/* ─── Reduced motion ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .ra-lens,
  .ra-genie,
  .ra-player,
  .ra-modal,
  .ra-modal-overlay,
  .readalong-narrative .w,
  body.ra-playing-active {
    transition: none !important;
    animation: none !important;
  }
  .tts-btn.ra-playing::after {
    animation: none !important;
    opacity: 0.6;
  }
  .ra-ctrl.ra-loading::after {
    animation: none !important;
    opacity: 0.6;
  }
}

/* ─── Keyboard focus ───────────────────────────────────────── */
.ra-ctrl:focus-visible,
.ra-select:focus-visible,
.ra-btn:focus-visible,
.ra-input:focus-visible,
.readalong-narrative .w:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}