.reader-layout {
  position: relative;
  min-height: var(--reader-viewport-height, 100dvh);
  padding-top: var(--reader-topbar-height, 64px);
}

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

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

.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 {
  display: none;
}

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

.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;
}

.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(var(--reader-viewport-height, 100dvh) - var(--reader-topbar-height, 64px));
  padding: 12px 0 max(12px, env(safe-area-inset-bottom));
  box-sizing: border-box;
}

.toc-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: min(320px, 86vw);
  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: auto;
  padding: 10px;
  display: grid;
  gap: 8px;
}

.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;
}

.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%);
}

.reader-viewport {
  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;
}

.reader-content {
  column-width: var(--page-width, 100vw);
  column-gap: 0;
  font-size: calc(var(--font-size) * 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.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;
  -moz-font-feature-settings: "vert" 1;
  font-feature-settings: "vert" 1;
}

.reader-content.force-horizontal {
  writing-mode: horizontal-tb;
  text-orientation: mixed;
}

.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 .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;
}

.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 {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: max(8px, env(safe-area-inset-bottom));
  z-index: 4;
  pointer-events: none;
  text-align: center;
  text-shadow: 0 1px 2px var(--bg);
}

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

.tap-zone {
  position: fixed;
  inset: 0;
  z-index: 5;
  background: transparent;
  pointer-events: auto;
}

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 {
  overflow-x: hidden;
  overflow-y: auto;
  scroll-snap-type: none;
  touch-action: pan-y;
}

body.mode-scrolly .reader-content {
  column-width: auto;
  column-gap: 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: min(320px, 92vw);
  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;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  touch-action: pan-y;
}

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

.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: 4px 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: grid;
  gap: 8px;
  align-content: start;
  min-height: 0;
  padding: 0 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: 12px;
  background: color-mix(in srgb, var(--panel), #000 4%);
  overflow: hidden;
}

.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: 8px;
  padding: 0 12px 10px;
}

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

.settings-panel .field {
  display: grid;
  gap: 2px;
}

.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%;
}

.range-guide-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;
}

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

.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: transparent;
  color: var(--text);
}

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

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

.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;
  }

  .settings-panel {
    width: min(340px, 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: 0 12px max(12px, env(safe-area-inset-bottom));
    gap: 8px;
    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: 0 10px max(10px, env(safe-area-inset-bottom));
    gap: 6px;
  }
}