:root {
  --original-bg: #fafaf9;
  --translation-bg: #fffbeb;
  --english-bg: #f0fdf4;
  --line-height: 1.85;
  /* WSJ body text uses Exchange; Newsreader is a similar editorial serif for the web. */
  --font-reader-english: "Newsreader", "Charter", "Bitstream Charter", "Georgia", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --original-bg: #171412;
    --translation-bg: #1a1612;
    --english-bg: #142019;
  }
}

.reader-app {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.toolbar {
  padding: 0.55rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.toolbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  min-width: 0;
}

.toolbar-left,
.toolbar-right {
  display: flex;
  gap: 0.45rem;
  align-items: center;
  min-width: 0;
}

.toolbar-left {
  flex: 1 1 auto;
}

.toolbar-right button {
  min-width: 2.25rem;
  padding-inline: 0.55rem;
}

select,
button {
  font: inherit;
}

select {
  flex: 1 1 auto;
  min-width: 10rem;
  max-width: 100%;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  background: var(--bg);
  color: var(--text);
}

#novel-select {
  flex: 1 1 12rem;
  max-width: 28rem;
}

#chapter-select {
  flex: 2 1 16rem;
  max-width: 100%;
}

button {
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

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

.reader-shell {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.column-headers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  flex-shrink: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}

.column-label {
  padding: 0.55rem 1.25rem;
  border-right: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.right-header {
  display: flex;
  justify-content: center;
  padding: 0.35rem 1.25rem;
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
  background: var(--bg);
}

.lang-btn {
  padding: 0.35rem 0.85rem;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.lang-btn + .lang-btn {
  border-left: 1px solid var(--border);
}

.lang-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.lang-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.pane-view-toggle {
  display: none;
  flex-shrink: 0;
  padding: 0.45rem 0.75rem;
  gap: 0.35rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.pane-view-btn {
  flex: 1;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  background: var(--bg);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  touch-action: manipulation;
}

.pane-view-btn.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.reader-shell[data-pane-view="original"] .column-headers,
.reader-shell[data-pane-view="translation"] .column-headers {
  grid-template-columns: 1fr;
}

.reader-shell[data-pane-view="original"] .column-label--original,
.reader-shell[data-pane-view="translation"] .right-header {
  border-right: none;
}

.reader-shell[data-pane-view="original"] .right-header,
.reader-shell[data-pane-view="translation"] .column-label--original {
  display: none;
}

.reader-shell[data-pane-view="original"] .reader,
.reader-shell[data-pane-view="translation"] .reader {
  grid-template-columns: 1fr;
}

.reader-shell[data-pane-view="original"] .segment,
.reader-shell[data-pane-view="translation"] .segment {
  display: block;
  grid-template-columns: none;
}

.reader-shell[data-pane-view="original"] .pane-translation,
.reader-shell[data-pane-view="translation"] .pane-original {
  display: none !important;
}

.reader-shell[data-pane-view="original"] .pane-original,
.reader-shell[data-pane-view="translation"] .pane-translation {
  border-right: none;
}

.segment--label .pane-original,
.segment--summary .pane-original,
.segment--footnote .pane-original {
  border-right: 1px solid var(--border);
}

.reader-shell[data-layout="single"] .right-header,
.reader-shell[data-layout="single"] .pane-view-toggle {
  display: none !important;
}

.reader-shell[data-layout="single"] .column-headers {
  grid-template-columns: 1fr;
}

.reader-shell[data-layout="single"] .reader {
  grid-template-columns: 1fr;
}

.reader-shell[data-layout="single"] .segment {
  display: block;
  grid-template-columns: none;
}

.reader-shell[data-layout="single"] .pane-only,
.reader-shell[data-layout="single"] .pane-original {
  border-right: none;
}

.reader {
  flex: 1;
  min-height: 0;
  overflow: auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-content: start;
}

.loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 1rem;
  color: var(--muted);
}

.segment {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: subgrid;
  border-bottom: 1px solid var(--border);
}

.segment:hover {
  background: var(--segment-hover);
}

.segment--summary .pane-original,
.segment--summary .pane-translation,
.segment--footnote .pane-original,
.segment--footnote .pane-translation {
  color: inherit;
}

.segment--summary .section-label {
  color: var(--muted);
}

.segment--footnote .pane-original,
.segment--footnote .pane-translation {
  font-size: 0.88em;
  line-height: 1.55;
}

.segment-num {
  grid-column: 1 / -1;
  padding: 0.85rem 1.25rem 0.15rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
  border-top: 1px solid var(--border);
}

.segment:first-child .segment-num {
  border-top: none;
  padding-top: 0.65rem;
}

.pane {
  padding: 0.35rem 1.25rem 1.1rem;
  font-family: var(--font-serif);
  font-size: clamp(0.92rem, 1.2vw, 1.1rem);
  line-height: var(--line-height);
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 100%;
}

.pane-original {
  background: var(--original-bg);
  border-right: 1px solid var(--border);
}

.pane-translation {
  background: var(--translation-bg);
}

.pane-translation.lang-english {
  background: var(--english-bg);
  font-family: var(--font-reader-english);
  font-size: clamp(0.98rem, 1.25vw, 1.12rem);
  font-weight: 500;
  font-variation-settings: "opsz" 18;
  letter-spacing: 0.01em;
}

.reader-shell[data-layout="single"] .pane {
  font-family: var(--font-reader-english);
  font-size: clamp(0.98rem, 1.25vw, 1.12rem);
  font-weight: 500;
  font-variation-settings: "opsz" 18;
  letter-spacing: 0.01em;
}

.reader-shell[data-language="en"] .pane-translation {
  font-family: var(--font-reader-english);
  font-size: clamp(0.98rem, 1.25vw, 1.12rem);
  font-weight: 500;
  font-variation-settings: "opsz" 18;
  letter-spacing: 0.01em;
}

.reader-shell[data-language="en"] .pane-original {
  font-family: var(--font-reader-english);
  font-size: clamp(0.94rem, 1.15vw, 1.05rem);
  font-weight: 400;
  font-variation-settings: "opsz" 14;
}

.verse-line {
  display: block;
  padding-left: 1.25rem;
  text-indent: -1.25rem;
}

.section-label {
  display: block;
  margin: 0.35rem 0 0.15rem;
  font-size: 0.82rem;
  font-weight: 700;
  font-variant: small-caps;
  letter-spacing: 0.08em;
  text-align: center;
  color: var(--muted);
}

.summary-line {
  display: block;
  margin: 0.15rem 0 0.65rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--border);
  font-size: clamp(0.96rem, 1.15vw, 1.08rem);
  font-style: italic;
  color: var(--text);
  line-height: 1.7;
}

.segment--summary .summary-line {
  font-size: clamp(1rem, 1.2vw, 1.12rem);
}

.argument-line {
  display: block;
  margin: 0.15rem 0 0.65rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--border);
  font-size: 0.88em;
  font-style: italic;
  color: var(--muted);
  line-height: 1.65;
}

.footnote-line {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78em;
  color: var(--muted);
  line-height: 1.5;
}

.footnote-line::before {
  content: "↑ ";
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.82rem;
  flex-shrink: 0;
}

@media (max-width: 720px) {
  .pane-view-toggle {
    display: flex;
  }

  .toolbar-row {
    flex-wrap: wrap;
  }

  .toolbar-left {
    flex: 1 1 100%;
    flex-wrap: wrap;
  }

  #novel-select,
  #chapter-select {
    flex: 1 1 100%;
    max-width: 100%;
    min-width: 0;
  }

  .pane {
    font-size: 0.88rem;
    padding-inline: 0.75rem;
  }

  .column-label,
  .right-header {
    padding-inline: 0.75rem;
  }
}