.reader-layout {
  position: relative;
  min-height: 100vh;
  min-height: var(--reader-viewport-height, 100dvh);
  padding-top: var(--reader-topbar-height, 64px);
  --settings-panel-width: min(360px, 94vw);
  transition: padding-top 0.16s ease;
}

.reader-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: grid;
  gap: 8px;
  padding: 10px 14px;
  background: color-mix(in srgb, var(--bg), transparent 10%);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.reader-topbar.hidden {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.reader-topbar .button.ghost {
  border-color: color-mix(in srgb, var(--accent), var(--text) 38%);
  background: color-mix(in srgb, var(--panel), var(--accent) 8%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent), transparent 78%);
}

.reader-topbar .button.ghost:hover,
.reader-topbar .button.ghost:focus-visible {
  border-color: color-mix(in srgb, var(--accent), var(--text) 55%);
  background: color-mix(in srgb, var(--panel), var(--accent) 14%);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent), transparent 66%);
}

.topbar-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: nowrap;
}

.reader-mode-badge {
  margin-top: 0;
  flex: 0 0 auto;
}

.topbar-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: nowrap;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.topbar-group-right {
  margin-left: auto;
  justify-content: flex-end;
}

body.topbar-auto-wrap .topbar-controls {
  flex-wrap: wrap;
  overflow-x: visible;
}

body.topbar-auto-wrap .topbar-group-right {
  margin-left: 0;
  justify-content: flex-start;
}

body.topbar-mobile-wrap .topbar-controls {
  flex-wrap: wrap;
  overflow-x: visible;
  align-items: flex-start;
}

body.topbar-mobile-wrap .topbar-group {
  flex-wrap: wrap;
}

body.topbar-mobile-wrap .topbar-group-right {
  margin-left: 0;
  justify-content: flex-start;
  width: 100%;
}

body.topbar-mobile-wrap .h-scroll-wrap {
  order: 1;
  display: grid;
  flex: 1 1 100%;
  min-width: 0;
}

body.topbar-mobile-wrap .h-scroll {
  width: 100%;
}

body.topbar-mobile-wrap .topbar-group-right .button {
  flex: 0 1 auto;
  min-width: 0;
}

.h-scroll {
  width: min(440px, 52vw);
  vertical-align: middle;
  direction: ltr;
}

body.writing-vertical .h-scroll {
  direction: rtl;
}

body.writing-horizontal .h-scroll {
  direction: ltr;
}

.h-scroll-wrap {
  display: grid;
  gap: 2px;
}

.h-scroll-page-info {
  font-size: 11px;
  line-height: 1.2;
  color: var(--muted);
  text-align: center;
  white-space: nowrap;
}

.reader-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  width: min(1200px, 94vw);
  margin: 0 auto;
  height: calc(100vh - var(--reader-topbar-height, 64px));
  height: calc(var(--reader-viewport-height, 100dvh) - var(--reader-topbar-height, 64px));
  padding: 12px 0 max(12px, env(safe-area-inset-bottom));
  box-sizing: border-box;
  transition: width 0.16s ease, height 0.16s ease, margin 0.16s ease;
}

body.chrome-hidden .reader-layout {
  padding-top: 0;
}

body.chrome-hidden .reader-main {
  height: var(--reader-viewport-height, 100dvh);
}

.toc-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: min(320px, 86vw);
  height: 100vh;
  height: 100dvh;
  max-height: var(--reader-viewport-height, 100dvh);
  background: var(--panel);
  border-left: 1px solid var(--border);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.25);
  z-index: 900;
  transform: translateX(100%);
  transition: transform 0.12s ease;
  overflow: hidden;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-sizing: border-box;
}

.toc-panel.open {
  transform: translateX(0);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.toc-panel .panel-header strong {
  font-size: 13px;
  line-height: 1.2;
}

.toc-panel ul {
  list-style: none;
  display: grid;
  gap: 5px;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: 0 0 max(16px, env(safe-area-inset-bottom));
  margin: 0;
}

.toc-panel ul button {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--text);
  border: 1px solid transparent;
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.3;
}

.toc-panel ul button:hover {
  border-color: var(--border);
  background: color-mix(in srgb, var(--panel), #000 6%);
}

.toc-panel .toc-empty {
  color: var(--muted);
  font-size: 13px;
  padding: 8px;
}

.reader-viewport {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  min-height: 0;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  touch-action: pan-x;
}

body.mode-paged .reader-main {
  width: min(980px, 96vw);
}

body.mode-paged .reader-viewport {
  overflow: hidden;
  padding-inline: clamp(38px, 6vw, 72px);
  border: 2px solid color-mix(in srgb, var(--border), var(--text) 16%);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.16);
  cursor: default;
}

body.mode-paged.writing-vertical .reader-viewport {
  height: 100%;
  padding-block: 0;
  align-self: stretch;
}
body.mode-paged .reader-viewport::before,
body.mode-paged .reader-viewport::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: clamp(18px, 2.4vw, 30px);
  z-index: 2;
  pointer-events: none;
}

body.mode-paged .reader-viewport::before {
  left: 0;
  border-right: 1px solid color-mix(in srgb, var(--border), var(--text) 12%);
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--panel), #000 10%), color-mix(in srgb, var(--panel), transparent 8%));
}

body.mode-paged .reader-viewport::after {
  right: 0;
  border-left: 1px solid color-mix(in srgb, var(--border), var(--text) 12%);
  background:
    linear-gradient(270deg, color-mix(in srgb, var(--panel), #000 10%), color-mix(in srgb, var(--panel), transparent 8%));
}

.reader-content {
  position: relative;
  z-index: 1;
  column-width: var(--page-width, 100vw);
  column-gap: 0;
  font-size: calc(var(--font-size) * var(--page-font-scale, 1) * 1%);
  line-height: var(--line-height);
  letter-spacing: var(--letter-spacing);
  font-family: var(--reader-font-family, system-ui, -apple-system, "Segoe UI", sans-serif);
}

body.mode-paged .reader-content {
  inline-size: var(--paged-inline-size, auto);
  block-size: var(--paged-block-size, auto);
  overflow: visible;
  margin-inline-start: auto;
  margin-inline-end: 0;
  column-width: var(--page-width, 100vw);
  column-count: auto;
}

body.mode-paged.spread-view-enabled .reader-content,
body.mode-paged.page-columns-enabled .reader-content {
  column-gap: var(--page-column-gap, 2.4em);
}

body.mode-paged:not(.spread-view-enabled):not(.page-columns-enabled) .reader-content {
  column-gap: 0;
}

body.mode-paged .reader-content.force-vertical {
  inline-size: var(--paged-inline-size, 100%);
  block-size: var(--paged-block-size, auto);
}

body.mode-paged.writing-vertical .reader-content.force-vertical {
  box-sizing: border-box;
  padding-inline: var(--vertical-page-gutter, 0px);
  max-inline-size: 100%;
  max-block-size: 100%;
}

body.mode-paged .reader-content.force-horizontal {
  inline-size: var(--paged-inline-size, 100%);
  block-size: var(--paged-block-size, auto);
}

body.mobile-text-pager.mode-paged .reader-content {
  column-width: auto;
  column-count: auto;
  inline-size: 100%;
  block-size: 100%;
  overflow: hidden;
  display: grid;
  place-items: center;
}

body.mobile-text-pager.mode-paged .reader-content.mobile-pager-content {
  padding-inline: var(--vertical-page-gutter, 0px);
}

.measured-pager-probe {
  position: fixed !important;
  top: 0 !important;
  left: -100000px !important;
  visibility: hidden !important;
  pointer-events: none !important;
  z-index: -1 !important;
  margin: 0 !important;
  overflow: hidden !important;
}

.measured-page-end {
  display: inline-block;
  inline-size: 0;
  block-size: 0;
  overflow: hidden;
}

.mobile-text-page {
  position: relative;
  box-sizing: border-box;
  width: min(100%, var(--mobile-text-page-width, 100%));
  height: min(100%, var(--mobile-text-page-height, 100%));
  writing-mode: vertical-rl;
  text-orientation: mixed;
  overflow: hidden;
  white-space: pre-wrap;
  margin: auto;
  padding: 0;
}

.mobile-text-page.vertical.has-title {
  padding-block-start: 1.9em;
}

.mobile-text-spread {
  box-sizing: border-box;
  display: grid;
  gap: var(--mobile-text-spread-gap, 28px);
  inline-size: min(100%, var(--mobile-text-spread-width, 100%));
  block-size: min(100%, var(--mobile-text-spread-height, 100%));
  margin-inline: auto;
  writing-mode: horizontal-tb;
  overflow: hidden;
}

.mobile-text-spread.spread.vertical,
.mobile-text-spread.vertical:not(.stacked) {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  direction: rtl;
}

.mobile-text-spread.spread.horizontal,
.mobile-text-spread.horizontal:not(.stacked) {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  direction: ltr;
}

.mobile-text-spread.stacked {
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: repeat(2, minmax(0, 1fr));
  grid-auto-flow: row;
  justify-items: stretch;
  align-items: stretch;
  direction: ltr;
}

.mobile-text-spread .mobile-text-page {
  width: 100%;
  height: 100%;
  inline-size: 100%;
  block-size: 100%;
  min-inline-size: 0;
  min-block-size: 0;
  margin: 0;
  direction: ltr;
}

.mobile-text-spread.stacked .mobile-text-page {
  min-width: 0;
  max-width: 100%;
  min-height: 0;
  max-height: 100%;
  justify-self: stretch;
  align-self: stretch;
}

.mobile-text-page.horizontal {
  writing-mode: horizontal-tb;
  text-orientation: mixed;
}

body.reader-debug-layout .reader-main,
body.reader-debug-layout .reader-viewport,
body.reader-debug-layout .reader-content,
body.reader-debug-layout .mobile-text-spread,
body.reader-debug-layout .mobile-text-page,
body.reader-debug-layout .mobile-text-page-body {
  position: relative;
  outline-offset: -2px;
}

body.reader-debug-layout .reader-main {
  outline: 2px dashed rgba(37, 99, 235, 0.7);
}

body.reader-debug-layout .reader-viewport {
  outline: 2px solid rgba(220, 38, 38, 0.75);
  background-image:
    linear-gradient(rgba(220, 38, 38, 0.08), rgba(220, 38, 38, 0.08));
}

body.reader-debug-layout .reader-content {
  outline: 2px dashed rgba(22, 163, 74, 0.8);
}

body.reader-debug-layout .mobile-text-spread {
  outline: 2px solid rgba(147, 51, 234, 0.9);
  background-image:
    linear-gradient(rgba(147, 51, 234, 0.08), rgba(147, 51, 234, 0.08));
}

body.reader-debug-layout .mobile-text-page {
  outline: 2px dashed rgba(245, 158, 11, 0.9);
  background-image:
    linear-gradient(rgba(245, 158, 11, 0.08), rgba(245, 158, 11, 0.08));
}

body.reader-debug-layout .mobile-text-page-body {
  outline: 1px solid rgba(8, 145, 178, 0.95);
}

body.reader-debug-layout .reader-viewport::before,
body.reader-debug-layout .reader-content::before,
body.reader-debug-layout .mobile-text-spread::before,
body.reader-debug-layout .mobile-text-page::before,
body.reader-debug-layout .mobile-text-page-body::before {
  position: absolute;
  top: 4px;
  left: 4px;
  z-index: 4;
  padding: 2px 5px;
  border-radius: 4px;
  background: rgba(17, 24, 39, 0.82);
  color: #fff;
  font-size: 11px;
  line-height: 1.2;
  letter-spacing: 0;
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  pointer-events: none;
}

body.reader-debug-layout .reader-viewport::before {
  content: "viewport";
}

body.reader-debug-layout .reader-content::before {
  content: "content";
}

body.reader-debug-layout .mobile-text-spread::before {
  content: "spread";
}

body.reader-debug-layout .mobile-text-page::before {
  content: "page";
}

body.reader-debug-layout .mobile-text-page-body::before {
  content: "body";
}

.mobile-text-page h1 {
  box-sizing: border-box;
  margin: 0 0 0 0.9em;
  padding: 0;
  font-size: 1.08em;
  line-height: 1.45;
  font-weight: 700;
  max-block-size: 4.2em;
  overflow: hidden;
}

.mobile-text-page.vertical h1 {
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  inline-size: 100%;
  block-size: 1.8em;
  margin: 0;
  text-align: start;
}

.mobile-text-page.horizontal h1 {
  margin: 0 0 0.9em;
  max-block-size: 4.2em;
}

.mobile-text-page-body {
  box-sizing: border-box;
  display: block;
  inline-size: 100%;
  block-size: 100%;
  margin: 0;
  padding: 0;
  white-space: pre-wrap;
}

.mobile-text-page.vertical .mobile-text-page-body.is-balanced {
  padding-block-start: var(--mobile-page-balance-block, 0px);
  padding-block-end: var(--mobile-page-balance-block, 0px);
}

.mobile-text-page.line-numbered .mobile-text-line {
  position: relative;
  block-size: calc(1em * var(--line-height, 1.8));
  max-block-size: calc(1em * var(--line-height, 1.8));
  white-space: nowrap;
}

.mobile-text-page.line-numbered .mobile-text-page-body {
  white-space: normal;
}

.mobile-text-page.line-numbered .mobile-text-line::before {
  content: attr(data-line);
  position: absolute;
  color: color-mix(in srgb, var(--muted), transparent 12%);
  font-size: 0.46em;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: 0;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
}

.mobile-text-page.horizontal.line-numbered .mobile-text-page-body {
  padding-inline-start: var(--line-number-gutter, 2.8em);
}

.mobile-text-page.horizontal.line-numbered .mobile-text-line {
  display: block;
}

.mobile-text-page.horizontal.line-numbered .mobile-text-line::before {
  inset-inline-start: calc(-1 * var(--line-number-gutter, 2.8em) + 4px);
  inset-block-start: 0.32em;
  inline-size: calc(var(--line-number-gutter, 2.8em) - 10px);
  text-align: end;
}

.mobile-text-page.vertical.line-numbered .mobile-text-page-body {
  padding-inline-start: var(--line-number-gutter, 1.9em);
}

.mobile-text-page.vertical.line-numbered .mobile-text-line {
  display: block;
  inline-size: 100%;
}

.mobile-text-page.vertical.line-numbered .mobile-text-line::before {
  top: calc(-1 * var(--line-number-gutter, 1.9em) + 6px);
  left: 50%;
  inline-size: auto;
  writing-mode: horizontal-tb;
  font-size: 0.42em;
  transform: translateX(-50%);
}

.mobile-text-page.horizontal.has-title .mobile-text-page-body {
  block-size: calc(100% - 5.4em);
}

body.pager-fit-warning::after {
  content: "表示が収まりません。設定を少し小さくしてください";
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 18px;
  z-index: 20;
  box-sizing: border-box;
  padding: 8px 12px;
  border: 1px solid var(--danger, #dc2626);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface), #dc2626 12%);
  color: var(--danger, #dc2626);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.4;
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  direction: ltr;
  white-space: normal;
  text-align: center;
  pointer-events: none;
}

.mobile-text-page .mp-strike,
.mobile-text-page s,
.mobile-text-page del,
.mobile-text-page strike {
  text-decoration-line: line-through;
  text-decoration-thickness: 0.08em;
  text-decoration-color: currentColor;
  text-decoration-skip-ink: none;
}

.mobile-text-page .mp-bold {
  font-weight: 700;
}

.mobile-text-page .mp-italic {
  font-style: italic;
}

.mobile-text-page .mp-underline {
  text-decoration-line: underline;
  text-decoration-skip-ink: auto;
}

.mobile-text-page .mp-emphasis {
  text-emphasis-style: sesame;
  text-emphasis-position: over right;
  -webkit-text-emphasis-style: sesame;
  -webkit-text-emphasis-position: over right;
}

.mobile-text-page img,
.mobile-text-page svg {
  max-inline-size: 100%;
  max-block-size: 100%;
  object-fit: contain;
}

body.distribution-mode .reader-content,
body.distribution-mode .reader-content * {
  user-select: none;
  -webkit-user-select: none;
}

body.distribution-mode .reader-content img {
  -webkit-user-drag: none;
}

.reader-content.force-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  line-break: strict;
  word-break: normal;
  overflow-wrap: normal;
  margin-left: auto;
  margin-right: 0;
  -moz-font-feature-settings: "vert" 1;
  font-feature-settings: "vert" 1;
}

.reader-content.force-horizontal {
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  overflow-wrap: anywhere;
  word-break: normal;
}

.reader-content ruby {
  ruby-position: over;
}

.reader-content rt {
  font-size: 0.52em;
  line-height: 1;
}

.reader-content.force-vertical .jp-tate-upright {
  text-orientation: upright;
}

.reader-content > * {
  scroll-snap-align: start;
}

.reader-content .chapter {
  display: block;
}

.reader-content .epub-html,
.reader-content .epub-body {
  writing-mode: inherit;
  text-orientation: inherit;
  direction: inherit;
  margin: 0;
  padding: 0;
  width: auto;
  height: auto;
  max-width: none;
  max-height: none;
}

.reader-content .epub-body p,
.reader-content .epub-body div,
.reader-content .epub-body section {
  margin: 0;
  padding: 0;
  writing-mode: inherit;
  text-orientation: inherit;
}

.reader-content .epub-body p {
  margin-block-end: 1.2em;
}

.reader-content .epub-body .epub-blank-line {
  min-block-size: 1em;
  margin-block-end: 0.8em;
}

.reader-content .epub-body br {
  display: block;
}

.reader-content .epub-body s,
.reader-content .epub-body del,
.reader-content .epub-body strike,
.reader-content .epub-body [data-tsukuyomi-strike="true"] {
  text-decoration-line: line-through;
}

.reader-content .chapter > h1,
.reader-content .chapter > h2,
.reader-content .chapter > h3 {
  margin: 0;
  font-size: 1.15em;
  line-height: 1.45;
}

.reader-content .txt-paragraph,
.reader-content .txt-line {
  margin: 0;
}

.reader-content .txt-gap {
  block-size: calc(1.25em * var(--gap-lines, 1));
}

.reader-content .chapter > *:last-child {
  margin-block-end: 0;
}

.reader-content .epub-colophon {
  opacity: 0.8;
  font-size: 0.92em;
}

body.pdf-reader-mode .reader-viewport {
  padding: 0;
  overflow: hidden;
  scroll-snap-type: none;
  touch-action: auto;
}

body.pdf-reader-mode .reader-content {
  width: 100%;
  height: 100%;
  column-width: auto;
  column-gap: 0;
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  line-height: normal;
  letter-spacing: 0;
}

body.mode-scrolly .reader-content.force-horizontal {
  inline-size: min(var(--page-width, 100%), 100%);
  max-inline-size: 100%;
  column-width: auto;
}

body.pdf-reader-mode .reader-content > * {
  scroll-snap-align: none;
}

.pdf-viewer-shell {
  width: 100%;
  height: 100%;
  min-height: calc(var(--reader-viewport-height, 100dvh) - var(--reader-topbar-height, 64px));
  background: color-mix(in srgb, var(--panel), #000 8%);
}

.pdf-viewer-frame {
  display: block;
  width: 100%;
  height: 100%;
  min-height: inherit;
  border: 0;
  background: color-mix(in srgb, var(--panel), #000 12%);
}

.pdf-viewer-fallback {
  display: none;
}

.reader-title {
  width: 100%;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reader-copyright {
  display: none;
}

.settings-copyright {
  padding-top: 2px;
  border-top: 1px solid var(--border);
}

.settings-privacy {
  margin: 16px 0 0;
  text-align: left;
}

.tap-zone {
  position: fixed;
  inset: 0;
  z-index: 5;
  background: transparent;
  pointer-events: auto;
  /* Browser panning can cancel pointerup before the reader resolves a tap. */
  touch-action: none;
}

body.mode-scrolly .tap-zone {
  touch-action: pan-y;
}

body.mode-scrolly .tap-zone {
  pointer-events: none;
}

body.mode-scrollx .tap-zone {
  pointer-events: auto;
  touch-action: pan-x;
  cursor: grab;
}

body.mode-scrollx .tap-zone:active {
  cursor: grabbing;
}

body.page-turn-flash .reader-viewport::after {
  content: "";
  position: fixed;
  inset: var(--reader-topbar-height, 64px) 0 0;
  background: color-mix(in srgb, var(--panel), #fff 28%);
  pointer-events: none;
  z-index: 6;
  animation: page-flash 260ms ease-out;
}

body.page-turn-slide .reader-viewport {
  animation: page-slide-forward 300ms cubic-bezier(0.22, 0.72, 0.24, 1);
}

body.page-turn-slide.page-turn-back .reader-viewport {
  animation-name: page-slide-back;
}

body.page-turn-shadow .reader-viewport::after {
  content: "";
  position: fixed;
  top: var(--reader-topbar-height, 64px);
  bottom: 0;
  width: min(22vw, 140px);
  pointer-events: none;
  z-index: 6;
  opacity: 0;
  animation: page-shadow 260ms ease-out;
}

body.page-turn-shadow.page-turn-forward .reader-viewport::after {
  right: 0;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.24));
}

body.page-turn-shadow.page-turn-back .reader-viewport::after {
  left: 0;
  background: linear-gradient(270deg, transparent, rgba(0, 0, 0, 0.24));
}

@keyframes page-flash {
  0% {
    opacity: 0.5;
  }
  100% {
    opacity: 0;
  }
}

@keyframes page-slide-forward {
  0% {
    transform: translateX(26px);
    opacity: 0.76;
  }
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes page-slide-back {
  0% {
    transform: translateX(-26px);
    opacity: 0.76;
  }
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes page-shadow {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  body.page-turn-flash .reader-viewport::after,
  body.page-turn-slide .reader-viewport,
  body.page-turn-shadow .reader-viewport::after {
    animation-duration: 1ms;
  }
}

body.mode-scrollx .reader-viewport {
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  touch-action: pan-x;
}

body.mode-scrolly .reader-viewport {
  scroll-snap-type: none;
}

/* Vertical writing flows the body horizontally, so scroll mode has to pan on
   the x axis. Horizontal writing keeps native vertical scrolling. */
body.mode-scrolly.writing-vertical .reader-viewport {
  overflow-x: auto;
  overflow-y: hidden;
  touch-action: pan-x;
}

body.mode-scrolly.writing-horizontal .reader-viewport,
body.mode-scrolly:not(.writing-vertical):not(.writing-horizontal) .reader-viewport {
  overflow-x: hidden;
  overflow-y: auto;
  touch-action: pan-y;
}

body.mode-scrolly .reader-content {
  column-width: auto;
  column-gap: 0;
}

body.mode-scrolly .reader-content.force-vertical {
  inline-size: auto;
  block-size: auto;
  min-block-size: 100%;
  max-block-size: none;
  margin-left: auto;
  margin-right: 0;
  column-width: auto;
}

body.mode-scrolly .reader-content.force-vertical .chapter {
  block-size: auto;
  margin-left: 0;
  margin-right: 0;
  margin-block-start: 0;
  margin-block-end: 2rem;
  padding-block-start: 0;
  padding-block-end: 0;
}

.tap-zone.disabled {
  pointer-events: none;
}

.ui-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.25);
  z-index: 800;
  display: none;
}

.ui-overlay.open {
  display: block;
}

.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--settings-panel-width);
  height: 100vh;
  height: 100dvh;
  background: var(--panel);
  border-left: 1px solid var(--border);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.25);
  transform: translateX(100%);
  transition: transform 0.2s ease;
  z-index: 950;
  visibility: hidden;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  touch-action: pan-y;
}

.settings-panel.open {
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}

@media (min-width: 900px) {
  body.settings-open .reader-topbar {
    right: var(--settings-panel-width);
  }

  body.settings-open .reader-main,
  body.settings-open.mode-paged .reader-main {
    width: calc(100vw - var(--settings-panel-width) - 36px);
    max-width: calc(100vw - var(--settings-panel-width) - 36px);
    margin-left: 12px;
    margin-right: calc(var(--settings-panel-width) + 12px);
  }

  body.settings-open .ui-overlay {
    right: var(--settings-panel-width);
  }
}

.settings-panel > header {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  background: var(--panel);
  z-index: 1;
  padding: 12px 14px 10px;
  border-bottom: 1px solid var(--border);
}

.settings-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.settings-body {
  flex: 1 1 auto;
  display: block;
  min-height: 0;
  padding: 12px 14px calc(20px + env(safe-area-inset-bottom));
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
}

body.settings-open .tap-zone {
  pointer-events: none;
}

.settings-group {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel), #000 4%);
  overflow: hidden;
  min-height: 0;
}

.settings-group + .settings-group,
.settings-group + .build-info,
.build-info + .settings-privacy,
.settings-privacy + .settings-copyright {
  margin-top: 10px;
}

.settings-group-toggle {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
  text-align: left;
  user-select: none;
}

.settings-group-toggle::after {
  content: "＋";
  float: right;
  color: var(--muted);
}

.settings-group.open .settings-group-toggle::after {
  content: "－";
}

.settings-group-body {
  display: grid;
  gap: 10px;
  padding: 2px 12px 12px;
}

.settings-group:not(.open) .settings-group-body {
  display: none;
}

.settings-panel .field {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.settings-panel .disabled-field {
  color: var(--muted);
}

.field-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.field-head .label {
  flex: 1 1 8rem;
  min-width: 0;
}

.field-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex: 1 1 100%;
  min-width: 0;
}

.field-value {
  font-size: 12px;
  line-height: 1.15;
  color: var(--muted);
  text-align: right;
  white-space: normal;
  overflow-wrap: anywhere;
  min-width: 0;
}

.field-badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.4rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 11px;
  line-height: 1;
  white-space: nowrap;
}

.field-badge.exact {
  color: #155f28;
  background: color-mix(in srgb, #3faf5c, transparent 82%);
  border-color: color-mix(in srgb, #3faf5c, var(--border) 45%);
}

.field-badge.near {
  color: #7a5a0b;
  background: color-mix(in srgb, #d9a22c, transparent 82%);
  border-color: color-mix(in srgb, #d9a22c, var(--border) 45%);
}

.field-badge.off {
  color: var(--muted);
  background: color-mix(in srgb, var(--panel), #000 10%);
}

.field-badge.flash {
  animation: genko-badge-flash 0.7s ease;
}

@keyframes genko-badge-flash {
  0% {
    transform: scale(0.94);
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent), transparent 100%);
  }
  45% {
    transform: scale(1.06);
    box-shadow: 0 0 0 8px color-mix(in srgb, var(--accent), transparent 82%);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent), transparent 100%);
  }
}

.range-with-guide {
  position: relative;
  --genko-guide-percent: 88%;
  --saved-range-percent: -1%;
}

.range-guide-pin,
.standard-range-pin,
.saved-range-pin {
  position: absolute;
  top: 50%;
  left: var(--genko-guide-percent, 100%);
  transform: translate(-50%, -50%);
  width: 2px;
  height: 18px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--bg), transparent 20%);
  pointer-events: none;
}

.standard-range-pin {
  left: 50%;
  width: 2px;
  height: 14px;
  background: color-mix(in srgb, var(--accent), transparent 28%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--panel), transparent 8%);
}

.saved-range-pin {
  left: var(--saved-range-percent, -1%);
  width: 1px;
  height: 12px;
  background: color-mix(in srgb, var(--text), transparent 24%);
  opacity: 0.75;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--panel), transparent 8%);
}

.range-guide-pin::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
}

.standard-range-pin::before,
.saved-range-pin::before {
  content: none;
}

.range-guide-hint {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.1;
}

.settings-panel input[type="range"] {
  width: 100%;
}

.settings-panel select {
  width: 100%;
  padding: 7px 9px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel), #000 4%);
  color: var(--text);
}

.settings-panel select option {
  color: #14141a;
  background: #ffffff;
}

body.theme-dark .settings-panel select option {
  color: #f2f2f4;
  background: #171722;
}

.settings-panel .label {
  margin-bottom: 2px;
  font-size: 13px;
}

.settings-panel .button {
  padding: 8px 12px;
  border: 1px solid color-mix(in srgb, var(--accent), var(--text) 32%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent), transparent 82%);
}

.settings-panel .button.ghost {
  border-color: color-mix(in srgb, var(--accent), var(--text) 38%);
  background: color-mix(in srgb, var(--panel), var(--accent) 8%);
}

.settings-panel .button.ghost.danger {
  border-color: color-mix(in srgb, var(--danger), var(--border) 25%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--danger), transparent 84%);
}

.settings-reset-action {
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.settings-reset-action .button {
  width: 100%;
}

.option-check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  width: 100%;
  padding: 9px 10px;
  border: 1px solid color-mix(in srgb, var(--accent), var(--text) 28%);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel), var(--accent) 6%);
  line-height: 1.45;
}

.option-check:has(input:checked) {
  border-color: color-mix(in srgb, var(--accent), var(--text) 55%);
  background: color-mix(in srgb, var(--accent), var(--panel) 78%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent), transparent 72%);
}

.settings-panel .button:hover,
.settings-panel .button:focus-visible {
  border-color: color-mix(in srgb, var(--accent), var(--text) 48%);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent), transparent 72%);
}

.settings-panel .button.ghost.danger:hover,
.settings-panel .button.ghost.danger:focus-visible {
  border-color: color-mix(in srgb, var(--danger), var(--text) 42%);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--danger), transparent 74%);
}

.build-info {
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 8px;
  word-break: break-word;
}

.build-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.build-label {
  color: var(--muted);
}

html,
body {
  height: 100%;
  overflow: hidden;
}

@media (max-width: 900px) {
  .reader-topbar {
    gap: 8px;
    padding: 8px 10px;
  }

  .topbar-group-right {
    margin-left: auto;
    justify-content: flex-end;
  }

  .topbar-group {
    gap: 6px;
  }

  .topbar-controls {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .topbar-group-right {
    margin-left: 0;
    justify-content: flex-start;
    width: 100%;
  }

  .h-scroll-wrap {
    order: 1;
    flex: 1 1 100%;
    min-width: 0;
  }

  .h-scroll {
    width: 100%;
  }

  .topbar-group-right .version-badge {
    display: none;
  }

  .topbar-group-right .button {
    min-width: 0;
    padding: 7px 10px;
    font-size: 12px;
  }

  #exportBtn {
    max-width: 48vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .reader-title {
    font-size: 14px;
  }

  .reader-main {
    width: min(100vw - 16px, 720px);
    padding: 8px 0 max(14px, env(safe-area-inset-bottom));
  }

  .reader-viewport {
    border-radius: 16px;
    padding: 18px 16px;
  }

  body.mode-paged .reader-viewport {
    padding-inline: clamp(6px, 2vw, 24px);
  }

  /* The persistent page-edge gradients are desktop framing; on a phone they
     just darken the margins next to near-full-width text. Keep them for the
     紙影 page-turn effect, which redefines ::after while it plays. */
  body.mode-paged:not(.page-turn-shadow):not(.page-turn-flash) .reader-viewport::before,
  body.mode-paged:not(.page-turn-shadow):not(.page-turn-flash) .reader-viewport::after {
    background: none;
    border-color: transparent;
  }

  .settings-panel {
    width: min(360px, 96vw);
  }

  .settings-panel > header {
    padding: 12px 12px 8px;
  }

  .settings-header-actions {
    gap: 6px;
  }

  .settings-header-actions .button {
    min-height: 34px;
    padding: 6px 10px;
    font-size: 12px;
  }

  .settings-body {
    padding: 10px 12px max(12px, env(safe-area-inset-bottom));
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }

  .field-meta {
    justify-content: flex-start;
  }

  .field-value {
    text-align: left;
  }
}

@media (max-width: 480px) {
  .settings-panel > header {
    padding: 10px 10px 7px;
  }

  .settings-body {
    padding: 8px 10px max(10px, env(safe-area-inset-bottom));
  }
}

@media (max-width: 640px) {
  body.distribution-mode .reader-topbar .mode-badge {
    width: 1.65rem;
    min-width: 1.65rem;
    height: 1.65rem;
    padding: 0;
    overflow: hidden;
    color: transparent;
    position: relative;
  }

  body.distribution-mode .reader-topbar .mode-badge::before {
    content: "R";
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: #7a5a0b;
    font-weight: 800;
  }

  body.mode-paged .reader-title {
    display: none;
  }

  body.mode-paged .reader-topbar {
    padding-block-end: 6px;
  }
}
@media (max-width: 640px), (pointer: coarse) {
  body.mobile-paged-immersive {
    padding-top: 0;
    --mobile-reader-bottom-reserve: 0px;
    height: var(--reader-viewport-height, 100dvh);
    overflow: hidden;
  }

  body.mobile-paged-immersive .reader-layout {
    height: var(--reader-viewport-height, 100dvh);
    min-height: var(--reader-viewport-height, 100dvh);
    padding-top: 0;
    overflow: hidden;
  }

  body.mobile-paged-immersive.chrome-hidden .reader-layout {
    padding-top: 0;
  }

  body.mobile-paged-immersive .reader-main,
  body.mobile-paged-immersive.mode-paged .reader-main {
    width: min(100vw, 720px);
    margin-inline: 0;
    height: calc(var(--reader-viewport-height, 100dvh) - var(--mobile-reader-bottom-reserve, 0px));
    padding: max(6px, env(safe-area-inset-top)) 0 max(8px, env(safe-area-inset-bottom));
    gap: 0;
  }

  body.mobile-paged-immersive.chrome-hidden .reader-main,
  body.mobile-paged-immersive.chrome-hidden.mode-paged .reader-main {
    height: calc(var(--reader-viewport-height, 100dvh) - var(--mobile-reader-bottom-reserve, 0px));
  }

  body.mobile-paged-immersive.mode-paged .reader-viewport {
    height: 100%;
    max-height: 100%;
    padding-inline: clamp(3px, 1.2vw, 10px);
    border-inline-width: 0;
    transition: transform 140ms ease;
    transform-origin: top center;
  }

  body.mobile-paged-immersive.mode-paged:not(.chrome-hidden) .reader-viewport {
    transform: translateY(calc(var(--reader-topbar-height, 64px) * 0.82)) scale(0.8);
  }

  body.mobile-paged-immersive.mode-paged.writing-vertical .reader-viewport {
    height: 100%;
    align-self: stretch;
  }

  body.mobile-paged-immersive.topbar-reveal-guard .reader-topbar {
    pointer-events: none;
  }

  body.mobile-paged-immersive .reader-topbar {
    max-height: min(44vh, 260px);
    overflow-y: auto;
  }

  body.mobile-paged-immersive.chrome-hidden .reader-topbar {
    transform: translateY(-105%);
  }
}