:root {
  --bg: #ffffff;
  --fg: #000000;
  --muted: #666666;
  --accent: currentColor;
  --page-padding: clamp(16px, 4vw, 48px);
  --audio-height: 64px;
  --audio-gap: 2px;
  /* Padding tokens for flexibility */
  --pad-x: var(--page-padding);
  --pad-top: calc(var(--page-padding) * 1.2);
  --pad-bottom: var(--page-padding);
  --safe-top: 0px; /* extra top offset for header icons on small screens */
  --max-measure: 70ch; /* comfortable line length */
  --font-size: clamp(17px, 2.1vh + 0.2vw, 20px);
  --line-height: 1.7;
}

/* Dark theme overrides */
[data-theme="dark"] {
  --bg: #000000;
  --fg: #ffffff;
  --muted: #bbbbbb;
  --accent: currentColor;
}

/* Scoped to lightbox only - don't affect main page */
.lightbox .reader {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", Times, serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Fullscreen lightbox backdrop */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 10, 0.85);
  display: grid;
  place-items: center;
  z-index: 1000;
  opacity: 0;
  transition: opacity 260ms ease;
}

/* Reader fills entire viewport */
.reader {
  background: var(--bg);
  width: 100vw;
  height: 100dvh;
  min-height: 100dvh;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(18px) scale(0.985);
  transition: opacity 220ms ease, transform 320ms cubic-bezier(0.22, 1, 0.36, 1);
}

.lightbox.is-open {
  opacity: 1;
}

.lightbox.is-open .reader {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.lightbox.is-closing {
  opacity: 0;
}

.lightbox.is-closing .reader {
  opacity: 0;
  transform: translateY(14px) scale(0.99);
}

@media (prefers-reduced-motion: reduce) {
  .lightbox,
  .reader {
    transition: none !important;
  }
}

.content {
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
  max-width: var(--max-measure);
  margin: 0 auto;
  padding: var(--pad-top) var(--pad-x) var(--pad-bottom);
  font-size: var(--font-size);
  line-height: var(--line-height);
  color: var(--fg);
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  box-sizing: border-box;
}

.audioBar {
  height: var(--audio-height);
  max-width: var(--max-measure);
  width: min(var(--max-measure), calc(100% - 2 * var(--pad-x)));
  display: grid;
  grid-template-columns: auto auto 1fr auto auto;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  margin: var(--audio-gap) auto 0;
  padding-bottom: max(6px, env(safe-area-inset-bottom));
  user-select: none;
}

/* Phone breakpoint adjustments */
@media (max-width: 640px) {
  :root {
    --pad-x: clamp(24px, 8vw, 40px); /* increase side gutters to avoid arrow overlap */
    --safe-top: 64px; /* area for theme + close icons */
    --pad-top: calc((var(--page-padding) * 1.2) + var(--safe-top));
    --pad-bottom: var(--page-padding);
  }
}
.audioBtn {
  width: 44px;
  height: 44px;
  border-radius: 0;
  display: grid;
  place-items: center;
  background: transparent;
  color: var(--fg);
  border: none;
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
}
.audioBtn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; }
.timeLabel { font-variant-numeric: tabular-nums; font-size: 0.9em; min-width: 84px; text-align: center; }
.speedWrap { display: inline-flex; align-items: center; }
.speedSelect {
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--muted);
  border-radius: 4px;
  font: inherit;
  font-size: 0.85em;
  line-height: 1;
  padding: 6px 8px;
  min-width: 62px;
}
.speedSelect:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.range {
  --range-track-h: 6px;
  --range-thumb-d: 18px;
  -webkit-appearance: none;
  appearance: none;
  height: var(--range-track-h);
  border-radius: 999px;
  background: transparent;
  outline: none;
}
[data-theme="dark"] .range { background: transparent; }
.range::-webkit-slider-runnable-track {
  height: var(--range-track-h);
  border-radius: 999px;
  background: rgba(0,0,0,0.2);
}
[data-theme="dark"] .range::-webkit-slider-runnable-track {
  background: rgba(255,255,255,0.3);
}
.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: var(--range-thumb-d);
  height: var(--range-thumb-d);
  border-radius: 50%;
  background: var(--fg);
  border: none;
  margin-top: calc((var(--range-track-h) - var(--range-thumb-d)) / 2);
  box-shadow: none;
}
.range::-moz-range-track {
  height: var(--range-track-h);
  border-radius: 999px;
  background: rgba(0,0,0,0.2);
}
[data-theme="dark"] .range::-moz-range-track {
  background: rgba(255,255,255,0.3);
}
.range::-moz-range-thumb {
  width: var(--range-thumb-d);
  height: var(--range-thumb-d);
  border-radius: 50%;
  background: var(--fg);
  border: none;
}
.range.progress { width: 100%; }
.volWrap { display: inline-flex; gap: 6px; align-items: center; }
.volWrap .range { width: 96px; }


/* Type scale and spacing ready for future headings */
h1, h2, h3 {
  line-height: 1.25;
  margin: 0 0 0.6em 0;
}
h1 { font-size: 1.8em; }
h2 { font-size: 1.4em; }
h3 { font-size: 1.2em; }
p { margin: 0 0 0.9em 0; }
p + p { margin-top: 0.4em; }

/* Hide synthetic punctuation used only to create TTS pause timing. */
.tts-hidden {
  display: none !important;
}


.closeBtn {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 44px;
  height: 44px;
  border-radius: 0;
  display: grid;
  place-items: center;
  background: transparent;
  color: var(--fg);
  border: none;
  cursor: pointer;
  z-index: 20;
  font-size: 28px;
  line-height: 1;
}

.themeToggle {
  position: absolute;
  top: 10px;
  left: 10px;
  width: 44px;
  height: 44px;
  border-radius: 0;
  display: grid;
  place-items: center;
  background: transparent;
  color: var(--fg);
  border: none;
  cursor: pointer;
  z-index: 20;
  font-size: 24px;
  line-height: 1;
}

.chapterSelector {
  position: absolute;
  top: 15px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
}

.chapterSelector .dropdown-wrapper {
  position: relative;
}

.chapterSelector select {
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--muted);
  border-radius: 6px;
  padding: 8px 36px 8px 12px;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  min-width: 200px;
  text-align: center;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

.chapterSelector select:focus {
  outline: 1px solid var(--fg);
  outline-offset: 0;
}

.chapterSelector .dropdown-arrow {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--muted);
  font-size: 12px;
}

.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;
}

/* Word highlighting for audio sync */
.w.is-active {
  background-color: rgba(0,0,0,0.12);
  border-radius: 2px;
}
[data-theme="dark"] .w.is-active {
  background-color: rgba(255,255,255,0.22);
}

/* Header styling */
.w.header1 {
  font-weight: bold;
  font-size: 1.3em;
}

.w.header2 {
  font-weight: bold;
  font-size: 1.15em;
}

.w.paragraph-start {
  /* Styling for paragraph start words */
  /* Additional margin could be added here if needed */
}