:root {
  color-scheme: light;
  --bg: #f4f6f3;
  --panel: #ffffff;
  --panel-strong: #f9faf8;
  --text: #1d241d;
  --muted: #667164;
  --border: #d9dfd5;
  --accent: #1f6f5b;
  --accent-strong: #175545;
  --shadow: 0 16px 40px rgba(37, 45, 35, 0.12);
  --reader-size: 19px;
  --reader-block-space: clamp(24px, 3.2vh, 38px);
  --reader-controls-space: 48px;
  --reader-page-bottom-reserve: calc(var(--reader-size) * 3.16);
  --reader-inline-space: clamp(18px, 6vw, 96px);
  --sidebar-width: 300px;
}

body[data-theme="sepia"] {
  --bg: #f0eadc;
  --panel: #fbf6e9;
  --panel-strong: #f5ecd9;
  --text: #2c2418;
  --muted: #74674f;
  --border: #ddd0b8;
  --accent: #7d4b25;
  --accent-strong: #5e371a;
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg: #151716;
  --panel: #1f2422;
  --panel-strong: #252c29;
  --text: #eff3ec;
  --muted: #a5b0a7;
  --border: #39423d;
  --accent: #65c5a7;
  --accent-strong: #8ad9c0;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.26);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (min-width: 821px) {
  html,
  body {
    overflow: hidden;
  }
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
  background: var(--panel-strong);
  transition: grid-template-columns 180ms ease;
}

body.sidebar-collapsed .app-shell {
  grid-template-columns: 0 minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  height: 100vh;
  padding: 14px;
  overflow: auto;
  background: var(--panel);
  border-right: 1px solid var(--border);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
}

.sidebar-top {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand h1,
.brand p,
.book-sidebar-info h2,
.book-sidebar-info p {
  margin: 0;
}

.brand h1 {
  font-size: 18px;
}

.brand-copy {
  min-width: 0;
  overflow: hidden;
  opacity: 1;
  transition: opacity 120ms ease, width 180ms ease;
}

.sidebar-toggle {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 40;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  color: var(--text);
  background: color-mix(in srgb, var(--panel), transparent 8%);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
  transition: background-color 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.sidebar-toggle:hover {
  background: color-mix(in srgb, var(--accent), transparent 84%);
  border-color: transparent;
}

.sidebar-toggle:active {
  background: color-mix(in srgb, var(--accent), transparent 78%);
  border-color: transparent;
}

.sidebar-toggle img {
  display: block;
  width: 20px;
  height: 20px;
  opacity: 0.86;
}

body[data-theme="dark"] .sidebar-toggle img {
  filter: invert(1);
}

.sidebar-content {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
  opacity: 1;
  transition: opacity 120ms ease;
}

body.sidebar-collapsed .sidebar {
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  transform: translateX(-100%);
  visibility: hidden;
}

.brand p,
.book-author,
.book-meta,
.control span,
.file-picker span {
  color: var(--muted);
  font-size: 13px;
}

.book-sidebar-info {
  display: grid;
  gap: 4px;
  padding: 12px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.book-sidebar-info h2 {
  font-size: 16px;
  line-height: 1.25;
}

.file-picker,
.control {
  display: grid;
  gap: 8px;
}

.file-picker input,
.control input,
.control select {
  width: 100%;
  min-width: 0;
  padding: 10px 11px;
  color: var(--text);
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.control select {
  cursor: pointer;
}

.control input[readonly] {
  cursor: default;
}

.sample-button {
  min-height: 38px;
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
}

.sample-button:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.segmented {
  display: flex;
  gap: 6px;
}

.segmented button {
  flex: 1;
  min-height: 36px;
  color: var(--text);
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.segmented button:hover,
.segmented button.is-active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.reader-panel {
  position: relative;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-width: 0;
  height: 100vh;
  overflow: hidden;
  background: var(--bg);
}

.book-meta {
  line-height: 1.35;
}

.page-toolbar {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 46px;
  align-items: center;
  gap: 12px;
  min-height: 38px;
  padding: 6px 12px 8px;
  background: var(--panel);
  border-top: 1px solid var(--border);
}

.reader-controls {
  position: fixed;
  top: 12px;
  right: 16px;
  z-index: 20;
  display: flex;
  align-items: stretch;
  gap: 0;
  min-height: 46px;
  padding: 0;
  background: color-mix(in srgb, var(--panel), transparent 8%);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
}

.reader-controls-content {
  display: flex;
  align-items: stretch;
  gap: 0;
}

body.reader-controls-collapsed .reader-controls-content {
  display: none;
}

.reader-controls button {
  display: grid;
  place-items: center;
  min-height: 46px;
  padding: 0 6px;
  color: var(--text);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0;
  transition: background-color 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.reader-controls button:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent), transparent 84%);
  border-color: transparent;
}

.reader-controls button:active:not(:disabled) {
  background: color-mix(in srgb, var(--accent), transparent 78%);
  border-color: transparent;
}

.reader-controls button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.page-key-button {
  display: grid;
  place-items: center;
  width: 46px;
  height: 32px;
  min-width: 0;
  color: var(--text);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  transition: background-color 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.page-key-button:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent), transparent 84%);
}

.page-key-button:active:not(:disabled) {
  background: color-mix(in srgb, var(--accent), transparent 78%);
}

.page-key-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.page-key-button img {
  display: block;
  width: 25px;
  height: 25px;
  opacity: 0.82;
}

.page-key-button.is-key-pressed,
.shortcut-button.is-key-pressed,
.controls-toggle-button.is-key-pressed {
  animation: none;
}

.page-key-button.is-key-pressed img,
.shortcut-button.is-key-pressed img,
.controls-toggle-button.is-key-pressed img {
  animation: key-press 160ms ease-out;
}

.shortcut-icons {
  display: flex;
  align-items: stretch;
  gap: 0;
  padding: 0;
}

.shortcut-button {
  grid-template-columns: auto auto;
  min-width: 0;
  min-height: 46px;
  gap: 4px;
  padding: 0 5px 0 2px;
  border-radius: 0;
}

.shortcut-button:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent), transparent 84%);
}

.shortcut-icons img {
  display: block;
  width: 25px;
  height: 25px;
  opacity: 0.78;
}

.shortcut-button span {
  color: var(--muted);
  font-size: 11px;
  line-height: 1;
  white-space: nowrap;
}

#pageSpeechButton {
  justify-content: start;
  flex: 0 0 105px;
  width: 105px;
}

.controls-toggle-button {
  grid-template-columns: auto auto;
  gap: 4px;
  padding: 0 6px 0 2px;
}

@keyframes key-press {
  0% {
    transform: translateY(0);
  }

  42% {
    transform: translateY(1px);
  }

  100% {
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-key-button.is-key-pressed,
  .shortcut-button.is-key-pressed,
  .controls-toggle-button.is-key-pressed {
    animation: none;
  }

  .page-key-button.is-key-pressed img,
  .shortcut-button.is-key-pressed img,
  .controls-toggle-button.is-key-pressed img {
    animation: none;
  }
}

body[data-theme="dark"] .shortcut-icons img,
body[data-theme="dark"] .page-key-button img,
body[data-theme="dark"] .controls-toggle-button img {
  filter: invert(1);
}

.page-progress {
  display: grid;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 4px;
  min-width: 0;
}

.page-progress-rail {
  position: relative;
  height: 14px;
  min-width: 0;
  border-radius: 999px;
  cursor: pointer;
  touch-action: none;
}

.page-progress-rail::before {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--border);
  border-radius: 999px;
  content: "";
  transform: translateY(-50%);
}

.page-progress-dot {
  position: absolute;
  top: 50%;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.page-progress-rail:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent), transparent 35%);
  outline-offset: 6px;
}

.page-progress-rail.is-dragging {
  cursor: grabbing;
}

.page-progress-rail.is-disabled {
  cursor: default;
}

.page-progress-dot[hidden] {
  display: none;
}

#pageStatus {
  color: var(--muted);
  font-size: 11px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.reader {
  height: 100%;
  padding: calc(var(--reader-controls-space) + var(--reader-block-space)) var(--reader-inline-space) var(--reader-block-space);
  overflow: hidden;
  font-family: Georgia, "Times New Roman", serif;
  font-size: var(--reader-size);
  line-height: 1.58;
}

.bilingual-page {
  display: grid;
  grid-template-columns: minmax(0, 378px) minmax(0, 378px);
  justify-content: center;
  align-content: start;
  gap: 14px 14px;
  height: calc(100% - var(--reader-page-bottom-reserve));
  max-width: 816px;
  margin: 0 auto;
  overflow: visible;
}

.cover-page {
  display: grid;
  place-items: center;
  height: calc(100% - var(--reader-page-bottom-reserve));
  max-width: 816px;
  margin: 0 auto;
}

.cover-page img {
  display: block;
  max-width: min(100%, 430px);
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.18);
}

.parallel-block {
  min-width: 0;
  margin-inline: -4px;
  padding-inline: 4px;
}

.reader h3,
.reader p {
  overflow-wrap: anywhere;
}

.reader h3 {
  margin: 0 0 12px;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 22px;
  line-height: 1.2;
}

.reader p {
  margin: 0 0 1.1em;
}

.english-block.is-loading {
  color: var(--muted);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 15px;
}

body.translation-hidden .english-block,
body.translation-hidden .english-block .word {
  color: transparent !important;
  text-decoration-color: transparent !important;
}

body.translation-hidden .english-block .word:hover,
body.translation-hidden .english-block .word.is-aligned,
body.translation-hidden .english-block .word.is-fragment-active {
  background: transparent;
  box-shadow: none;
  outline-color: transparent;
}

.word {
  margin: 0 1px;
  padding: 0 1px;
  border-radius: 4px;
  transition: background-color 100ms ease, color 100ms ease;
}

.word.is-reading-enter {
  transition: none;
}

.word:hover,
.word.is-aligned {
  background: color-mix(in srgb, var(--accent), transparent 88%);
  color: var(--text);
}

.word.is-fragment-active {
  background: color-mix(in srgb, var(--accent), transparent 78%);
  color: var(--text);
}

.word.is-being-read {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.18em;
}

.empty-state {
  max-width: 520px;
  margin: 12vh auto 0;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.empty-state h3 {
  margin-top: 0;
}

@media (max-width: 820px) {
  :root {
    --reader-controls-space: 44px;
  }

  .app-shell {
    grid-template-columns: 1fr;
  }

  body.sidebar-collapsed .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  body.sidebar-collapsed .sidebar {
    height: 0;
    padding: 0;
    border-bottom: 0;
  }

  .reader {
    height: auto;
    min-height: 70vh;
  }

  .reader-panel {
    height: auto;
    min-height: 100vh;
  }

  .page-toolbar {
    padding-inline: 12px;
  }

  .reader-controls {
    top: 8px;
    right: 8px;
    gap: 0;
    padding: 0;
  }

  .page-progress {
    gap: 8px;
  }

  .shortcut-icons {
    gap: 0;
  }

  .shortcut-button span {
    font-size: 10px;
  }

  .bilingual-page {
    grid-template-columns: 1fr;
  }

}