:root {
  color-scheme: light;
  --text: #1f2937;
  --surface: #ffffff;
  --border: #d1d5db;
  --hover: #f3f4f6;
  --accent: #2563eb;
  --selected-bg: #eff6ff;
  --selected-text: #1d4ed8;
}

:root[data-theme="light"] {
  color-scheme: light;
  --text: #1f2937;
  --surface: #ffffff;
  --border: #d1d5db;
  --hover: #f3f4f6;
  --hoverRgb: 243, 244, 246;
  --accent: #2563eb;
  --selected-bg: #eff6ff;
  --selected-text: #1d4ed8;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --text: #e4e4e7;
  --surface: #27272a;
  --border: #52525b;
  --hover: #3f3f46;
  --hoverRgb: 63, 63, 70;
  --accent: #60a5fa;
  --selected-bg: #172554;
  --selected-text: #93c5fd;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --text: #e4e4e7;
    --surface: #27272a;
    --border: #52525b;
    --hover: #3f3f46;
    --hoverRgb: 63, 63, 70;
    --accent: #60a5fa;
    --selected-bg: #172554;
    --selected-text: #93c5fd;
  }
}

html {
  overscroll-behavior: none;
}

a:focus-visible {
  outline-color: var(--accent);
}

.app {
  display: flex;
  flex-direction: row;
}

.viewer {
  display: flex;
  flex-direction: column;
  width: 100dvw;
  height: 100dvh;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  box-sizing: border-box;
}

.viewerHeader {
  padding: 10px;
  padding-top: max(10px, env(safe-area-inset-top));
  min-height: 2.5rem;
  text-align: center;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
}

@media (max-width: 480px) {
  .viewerHeader {
    padding: 5px 10px;
    padding-top: max(5px, env(safe-area-inset-top));
  }
}

.titleContainer {
  display: grid;
  grid-template-columns: 50% 50%;
}

.ellipsis {
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

.mainTitle {
  font-size: 1.1rem;
  font-weight: 700;
  align-self: center;
}

.subTitle {
  font-size: 1rem;
  font-weight: 400;
  align-self: center;
}

@media (max-width: 480px) {
  .titleContainer {
    grid-template-columns: 1fr;
  }
  .mainTitle {
    font-size: 13px;
  }
  .subTitle {
    font-size: 12px;
  }
}

.viewerBody {
  flex: 1;
  min-height: 0;
  width: 100%;
  display: flex;
  position: relative;
}

.viewerContent {
  box-sizing: border-box;
  height: 100%;
  width: 100%;
  column-gap: 0;
}

.viewerContent:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.settingsButton,
.tocButton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--surface);
  color: var(--text);
  vertical-align: middle;
  cursor: pointer;
}

.settingsButton:hover,
.tocButton:hover {
  background: var(--hover);
  color: var(--text);
}

.settingsButton[aria-expanded="true"],
.tocButton[aria-expanded="true"] {
  border-color: var(--accent);
  background: var(--selected-bg);
  color: var(--selected-text);
}

.settingsButton:focus-visible,
.tocButton:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.viewerFooter {
  padding: 10px;
  height: 2.5rem;
  align-items: center;
  text-align: center;
  justify-content: center;
  display: flex;
  justify-content: space-around;
}

@media (max-width: 480px) {
  .viewerFooter {
    height: auto;
    padding: 5px;
    padding-bottom: max(5px, env(safe-area-inset-bottom));
  }
}

.footerCenter {
  display: flex;
  justify-content: center;
}

.viewerNotation {
  width: 100%;
  position: absolute;
  bottom: 0;
  left: 0;
  background: Canvas;
  padding: 10px;
  box-sizing: border-box;
  border-top: 1px solid var(--border);
}

.settingPanel,
.tocPanel {
  box-sizing: border-box;
  max-width: calc(100vw - 2rem);
  max-height: min(70dvh, calc(100dvh - 6rem));
  overflow: auto;
  overscroll-behavior: contain;
  margin: 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  color: var(--text);
  font-family: sans-serif;
  font-size: 0.875rem;
  text-align: left;
  box-shadow: 0 4px 16px rgb(0 0 0 / 10%);
  z-index: 1;
}

.promotionOverlay {
  position: relative;
  z-index: 10;
}

.promotionBackdrop {
  position: fixed;
  inset: 0;
  background: rgb(0 0 0 / 45%);
}

.promotionContainer {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: max(1rem, env(safe-area-inset-top))
    max(1rem, env(safe-area-inset-right)) max(1rem, env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-left));
}

.promotionDialog {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-sizing: border-box;
  width: 24rem;
  max-width: 100%;
  margin: auto;
  padding: clamp(1.5rem, 5vw, 2.5rem);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface);
  color: var(--text);
  font-family: sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  text-align: center;
  writing-mode: horizontal-tb;
  box-shadow: 0 16px 48px rgb(0 0 0 / 20%);
}

.promotionTitle {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.promotionDescription {
  margin: 0;
}

.promotionLink,
.promotionClose {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.625rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}

.promotionLink {
  border-color: var(--accent);
  background: var(--selected-bg);
  color: var(--selected-text);
  font-weight: 600;
}

.promotionLink:hover {
  background: color-mix(in srgb, var(--selected-bg), var(--accent) 15%);
}

.promotionClose {
  background: var(--surface);
  color: var(--text);
}

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

.promotionLink:focus-visible,
.promotionClose:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.settingsFieldset {
  min-width: 0;
  width: 22rem;
  max-width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
}

.settingsLegend {
  margin-bottom: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
}

.settingsField {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.375rem;
  padding: 0.5rem 0;
}

.settingsLabel {
  cursor: pointer;
}

.settingsControl {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  min-width: 0;
  gap: 0.25rem;
}

.settingsRangeControl {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 3rem;
  width: 100%;
}

.settingRange {
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
  margin: 0;
}

.settingsRangeControl > span {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.settingPanel input[type="checkbox"] {
  accent-color: var(--accent);
}

.settingPanel input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.settingsIcon {
  flex-shrink: 0;
}

@media (hover: hover) {
  .pagerButton:not([disabled]):hover > svg {
    background: color-mix(in srgb, var(--text) 10%, transparent);
  }
}

.pagerButton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: inherit;
  position: absolute;
  height: 100%;
  width: 3rem;
  background: none;
  border: none;
  cursor: pointer;
}

.pagerButton > svg {
  box-sizing: content-box;
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  padding: 8px;
  border-radius: 8px;
}

.pagerButton:disabled {
  opacity: 0.35;
  cursor: default;
}

.pagerButton:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}
.pagerButtonLeft {
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}
.pagerButtonRight {
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.tocList {
  margin: 0;
}

.tocList li {
  list-style: none;
  text-align: left;
}

.tocList ol {
  margin-left: 0.75rem;
  padding-left: 0.5rem;
  border-left: 1px solid var(--border);
}

.tocList > li + li {
  margin-top: 0.5rem;
}

.tocList a {
  display: block;
  padding: 0.5rem;
  border-radius: 0.375rem;
  color: var(--text);
  text-decoration: none;
}

.tocActive > a {
  background: var(--hover);
}

.tocList > li > a {
  font-weight: 600;
}

.tocList a:hover {
  background: var(--hover);
}

.tocList a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

@media (prefers-reduced-motion: no-preference) {
  .viewerHeader,
  .viewerFooter {
    transition: opacity 0.1s ease-in-out;
  }
}