:root {
  --paper: #f4f1e9;
  --sheet: #fffefa;
  --ink: #202123;
  --muted: #777875;
  --line: rgba(32, 33, 35, 0.14);
  --accent: #b20a0a;
  --reading-size: 20px;
  --reading-leading: 1.72;
  --ui: "Segoe UI", Arial, sans-serif;
  --condensed: "Bahnschrift Condensed", "Aptos Narrow", "Arial Narrow", sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  color-scheme: light;
}

body[data-reader-theme="sepia"] {
  --paper: #e8dfcf;
  --sheet: #f7f0e2;
  --ink: #30281f;
  --muted: #776b5f;
  --line: rgba(57, 42, 29, 0.17);
  --accent: #9d2519;
}

body[data-reader-theme="dark"] {
  --paper: #111315;
  --sheet: #181b1e;
  --ink: #eceae4;
  --muted: #a5a49f;
  --line: rgba(255, 255, 255, 0.14);
  --accent: #ee4a43;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--ui);
  transition: background 160ms ease, color 160ms ease;
}

button,
a {
  color: inherit;
  font: inherit;
}

a {
  text-decoration: none;
}

button {
  border: 0;
}

.reader-progress {
  position: fixed;
  z-index: 90;
  top: 0;
  right: 0;
  left: 0;
  height: 3px;
  pointer-events: none;
}

.reader-progress i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
  transition: width 80ms linear;
}

.reading-app {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  grid-template-rows: 74px minmax(0, 1fr) 36px;
  width: 100%;
  height: 100dvh;
}

.app-header {
  z-index: 50;
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 93%, transparent);
  backdrop-filter: blur(16px);
}

.header-main {
  display: grid;
  grid-template-columns: 250px minmax(180px, 1fr) auto auto;
  align-items: stretch;
  min-width: 0;
}

.app-brand,
.book-heading,
.primary-actions,
.utility-actions,
.header-aside {
  display: flex;
  align-items: center;
}

.app-brand {
  gap: 10px;
  padding: 0 23px;
  border-right: 1px solid var(--line);
}

.app-brand strong {
  font: 900 20px/1 var(--condensed);
  letter-spacing: 1.6px;
}

.app-brand small {
  color: var(--accent);
  font: 900 9px/1 var(--condensed);
  letter-spacing: 0.9px;
}

.book-heading {
  min-width: 0;
  gap: 15px;
  padding: 0 25px;
  font-family: var(--condensed);
  text-transform: uppercase;
}

.book-heading span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
}

.book-heading strong {
  overflow: hidden;
  font-size: 16px;
  letter-spacing: 0.8px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.primary-actions {
  gap: 8px;
  padding: 0 12px;
}

.primary-actions button,
.primary-actions a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: color-mix(in srgb, var(--sheet) 72%, transparent);
  cursor: pointer;
  font-size: 13px;
  font-weight: 650;
}

.utility-actions button,
.header-aside button {
  display: grid;
  width: 46px;
  height: 100%;
  place-items: center;
  border-left: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  font: 800 15px/1 var(--condensed);
}

.utility-actions button:last-child {
  border-right: 1px solid var(--line);
}

.header-aside {
  justify-content: flex-end;
  border-left: 1px solid var(--line);
}

.header-aside button {
  height: 56px;
}

.primary-actions button:hover,
.primary-actions a:hover,
.utility-actions button:hover,
.header-aside button:hover,
.primary-actions button:focus-visible,
.primary-actions a:focus-visible,
.utility-actions button:focus-visible,
.header-aside button:focus-visible {
  color: #fff;
  outline: none;
  background: var(--accent);
}

.reading-stage {
  position: relative;
  grid-column: 1;
  grid-row: 2;
  min-width: 0;
  overflow: auto;
  overscroll-behavior: contain;
  padding: clamp(40px, 5vw, 74px) clamp(35px, 6vw, 100px) 80px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--paper) 75%, transparent), transparent 13% 87%, color-mix(in srgb, var(--paper) 75%, transparent)),
    var(--sheet);
  scrollbar-color: var(--accent) transparent;
}

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

.reading-sheet {
  max-width: 1500px;
  margin: 0 auto;
}

.chapter-header {
  position: relative;
  max-width: 780px;
  margin: 0 auto 58px;
  padding: 0 0 38px;
  text-align: center;
}

.chapter-header::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 5px;
  margin: auto;
  content: "";
  background: var(--accent);
}

.chapter-header p {
  margin: 0 0 21px;
  color: var(--accent);
  font: 900 11px/1 var(--condensed);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.chapter-header > span {
  display: block;
  margin-bottom: 12px;
  color: var(--muted);
  font: 800 12px/1 var(--condensed);
  letter-spacing: 1px;
}

.chapter-header h1 {
  margin: 0 0 18px;
  font: 900 clamp(48px, 5.3vw, 78px)/0.92 var(--condensed);
  letter-spacing: -1.5px;
  text-transform: uppercase;
}

.chapter-header > strong {
  color: var(--muted);
  font: 800 11px/1 var(--condensed);
  letter-spacing: 1.3px;
  text-transform: uppercase;
}

.reading-columns {
  column-count: 2;
  column-gap: clamp(48px, 5vw, 88px);
  column-rule: 1px solid var(--line);
}

.reading-columns p {
  margin: 0 0 1.22em;
  font: var(--reading-size)/var(--reading-leading) var(--serif);
  text-align: justify;
  text-wrap: pretty;
  widows: 3;
  orphans: 3;
}

.reading-columns p:first-child::first-letter {
  float: left;
  margin: 0.08em 0.1em 0 0;
  color: var(--accent);
  font: 900 3.2em/0.78 var(--condensed);
}

.reader-note {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 24px;
  max-width: 850px;
  margin: 80px auto 0;
  padding: 34px 0 0;
  border-top: 1px solid var(--line);
}

.reader-note > span {
  color: var(--accent);
  font: 900 13px/1 var(--condensed);
}

.reader-note h2 {
  margin: 0 0 15px;
  font: 900 27px/1 var(--condensed);
  text-transform: uppercase;
}

.reader-note p {
  margin: 0;
  color: var(--muted);
  font: 17px/1.65 var(--serif);
}

.contents-panel {
  z-index: 45;
  grid-column: 2;
  grid-row: 2 / 4;
  display: flex;
  min-height: 0;
  flex-direction: column;
  overflow: auto;
  border-left: 1px solid var(--line);
  background: var(--paper);
}

.contents-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  padding: 0 30px;
  border-bottom: 1px solid var(--line);
}

.contents-heading h2 {
  margin: 0;
  font: 900 14px/1 var(--condensed);
  letter-spacing: 1.8px;
  text-transform: uppercase;
}

.contents-heading button {
  display: none;
  padding: 5px;
  background: transparent;
  cursor: pointer;
  font-size: 24px;
}

.contents-panel nav {
  padding: 24px 30px;
}

.contents-panel nav a {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 4px 10px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.contents-panel nav a span {
  grid-row: 1 / 3;
  color: inherit;
  font: 900 11px/1 var(--condensed);
}

.contents-panel nav a strong {
  font: 900 14px/1.1 var(--condensed);
  text-transform: uppercase;
}

.contents-panel nav a small {
  font-size: 10px;
}

.contents-panel nav a.active,
.contents-panel nav a:hover {
  color: var(--accent);
}

.contents-progress {
  margin-top: auto;
  padding: 30px;
}

.contents-progress > i {
  display: block;
  height: 5px;
  margin-bottom: 26px;
  background: var(--line);
}

.contents-progress > i b {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
}

.contents-progress > strong {
  display: block;
  font: 900 40px/1 var(--condensed);
}

.contents-progress > span {
  display: block;
  margin: 7px 0 19px;
  color: var(--muted);
  font: 900 11px/1 var(--condensed);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.contents-progress > small {
  color: var(--muted);
  font: 700 10px/1.6 var(--condensed);
  text-transform: uppercase;
}

kbd {
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 1px 3px;
  font: inherit;
}

.reader-footer {
  z-index: 40;
  grid-column: 1;
  grid-row: 3;
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) 180px;
  align-items: center;
  min-width: 0;
  padding: 0 28px;
  border-top: 1px solid var(--line);
  background: var(--sheet);
  color: var(--muted);
  font-size: 11px;
}

.reader-footer strong {
  overflow: hidden;
  color: var(--ink);
  font-weight: 500;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reader-footer span:last-child {
  text-align: right;
}

.settings-popover {
  position: fixed;
  z-index: 80;
  top: 82px;
  right: 316px;
  width: 260px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--paper);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.17);
}

.settings-popover > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  font: 800 11px/1 var(--condensed);
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.settings-popover .setting-row {
  justify-content: stretch;
}

.setting-row button {
  width: 50%;
  height: 38px;
  border: 1px solid var(--line);
  background: var(--sheet);
  cursor: pointer;
}

.theme-options {
  display: flex;
  gap: 8px;
}

.theme-options button {
  width: 27px;
  height: 27px;
  border: 2px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
}

.theme-options button[data-theme-choice="paper"] {
  background: #fffefa;
}

.theme-options button[data-theme-choice="sepia"] {
  background: #e8dfcf;
}

.theme-options button[data-theme-choice="dark"] {
  background: #181b1e;
}

.theme-options button[aria-pressed="true"] {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--paper), 0 0 0 4px var(--accent);
}

.settings-popover p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.5;
}

.contents-backdrop {
  position: fixed;
  z-index: 60;
  inset: 74px 0 0;
  background: rgba(8, 10, 12, 0.44);
  backdrop-filter: blur(2px);
}

body[data-focus="true"] .contents-panel {
  display: none;
}

body[data-focus="true"] .reading-app {
  grid-template-columns: minmax(0, 1fr);
}

body[data-focus="true"] .header-aside {
  display: none;
}

body[data-focus="true"] .app-header {
  grid-template-columns: minmax(0, 1fr);
}

@media (max-width: 1180px) {
  .reading-app {
    grid-template-columns: minmax(0, 1fr);
  }

  .app-header {
    grid-template-columns: minmax(0, 1fr);
  }

  .header-main {
    grid-template-columns: 220px minmax(140px, 1fr) auto auto;
  }

  .header-aside {
    display: none;
  }

  .contents-panel {
    position: fixed;
    z-index: 70;
    top: 74px;
    right: 0;
    bottom: 0;
    display: flex;
    width: min(360px, 90vw);
    transform: translateX(102%);
    box-shadow: -20px 0 50px rgba(0, 0, 0, 0.2);
    transition: transform 180ms ease;
  }

  .contents-panel[data-open="true"] {
    transform: translateX(0);
  }

  .contents-heading button {
    display: block;
  }

  .settings-popover {
    right: 18px;
  }
}

@media (max-width: 820px) {
  .header-main {
    grid-template-columns: minmax(0, 1fr) auto auto;
  }

  .app-brand {
    border-right: 0;
  }

  .book-heading {
    display: none;
  }

  .primary-actions {
    display: flex;
    padding: 0;
  }

  .primary-actions a {
    display: none;
  }

  .primary-actions button {
    width: 44px;
    height: 100%;
    padding: 0;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
    font-size: 0;
  }

  .primary-actions button span {
    font-size: 18px;
  }

  .reading-stage {
    padding: 38px 24px 70px;
  }

  .reading-columns {
    column-count: 1;
    column-rule: 0;
  }

  .reader-footer {
    grid-template-columns: 70px minmax(0, 1fr);
    padding: 0 15px;
  }

  .reader-footer > span:last-child {
    display: none;
  }
}

@media (max-width: 520px) {
  .reading-app {
    grid-template-rows: 62px minmax(0, 1fr) 34px;
  }

  .app-brand {
    padding: 0 15px;
  }

  .app-brand strong {
    font-size: 17px;
  }

  .app-brand small {
    display: none;
  }

  .utility-actions button {
    width: 42px;
  }

  .utility-actions button[data-reader-action="focus"] {
    display: none;
  }

  .reading-stage {
    padding: 31px 18px 58px;
  }

  .chapter-header {
    margin-bottom: 42px;
  }

  .chapter-header h1 {
    font-size: clamp(42px, 14vw, 60px);
  }

  .reading-columns p {
    text-align: left;
  }

  .reader-note {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 12px;
  }

  .contents-panel {
    top: 62px;
  }

  .contents-backdrop {
    inset: 62px 0 0;
  }

  .settings-popover {
    top: 70px;
    right: 10px;
    left: 10px;
    width: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}