:root {
  color-scheme: light;
  --reader-body-size: 18px;
  --reader-bg: #f5efe5;
  --reader-paper: #fbf7ef;
  --reader-paper-soft: #f7efe2;
  --reader-text: #273340;
  --reader-heading: #202b36;
  --reader-muted: rgba(39, 51, 64, .66);
  --reader-subtle: rgba(39, 51, 64, .58);
  --reader-faint: rgba(39, 51, 64, .12);
  --reader-rule: rgba(71, 82, 97, .16);
  --reader-border: rgba(39, 51, 64, .18);
  --reader-accent: #3c496b;
  --reader-accent-strong: #303d60;
  --reader-accent-soft: rgba(60, 73, 107, .1);
  --reader-warm: #8b6f4d;
  --reader-focus: #59688f;
  --reader-control-bg: rgba(251, 247, 239, .86);
  --reader-control-border: rgba(39, 51, 64, .14);
  --reader-input-bg: #fffaf2;
  --reader-input-text: #273340;
  --reader-placeholder: rgba(39, 51, 64, .56);
  --reader-success: #386846;
  --reader-error-text: #9b3f3f;
  --reader-bg-warm-glow: rgba(139, 111, 77, .09);
  --reader-bg-accent-glow: rgba(60, 73, 107, .08);
  --reader-bg-line: rgba(39, 51, 64, .018);
  --reader-page-edge: rgba(39, 51, 64, .038);
  --reader-stage-bg:
    radial-gradient(circle at 14% 6%, var(--reader-bg-warm-glow), transparent 25%),
    radial-gradient(circle at 86% 5%, var(--reader-bg-accent-glow), transparent 23%),
    repeating-linear-gradient(0deg, var(--reader-bg-line) 0 1px, transparent 1px 8px);
  --toolbar-accent: var(--reader-accent);
  --progress-accent: var(--reader-accent);
  --drawer-accent: var(--reader-accent);
  --chapter-accent: var(--reader-accent);
  --section-break-accent: var(--reader-warm);
  --feedback-accent: var(--reader-accent);
  --page-shadow-color: rgba(37, 47, 59, .08);
  --cover-glow: rgba(60, 73, 107, .12);
  --reader-shadow: 0 18px 58px rgba(37, 47, 59, .11);
  --reader-serif: Georgia, "Times New Roman", serif;
  --reader-display: "Cormorant Garamond", Georgia, serif;
  --reader-sans: "Inter", Arial, sans-serif;
  --page-width: 660px;
  --page-height: 960px;
  --page-padding-block: 78px;
  --page-padding-inline: 68px;
}

[data-reader-theme="sepia"] {
  color-scheme: light;
  --reader-bg: #efe1cf;
  --reader-paper: #f8eddb;
  --reader-paper-soft: #f1dfc6;
  --reader-text: #342d25;
  --reader-heading: #29231d;
  --reader-muted: rgba(52, 45, 37, .66);
  --reader-subtle: rgba(52, 45, 37, .58);
  --reader-faint: rgba(52, 45, 37, .14);
  --reader-rule: rgba(52, 45, 37, .18);
  --reader-border: rgba(52, 45, 37, .2);
  --reader-accent: #3e4a68;
  --reader-accent-strong: #303c5c;
  --reader-accent-soft: rgba(62, 74, 104, .12);
  --reader-warm: #7d6141;
  --reader-focus: #445276;
  --reader-control-bg: rgba(248, 237, 219, .9);
  --reader-control-border: rgba(52, 45, 37, .16);
  --reader-input-bg: #fff5e4;
  --reader-input-text: #342d25;
  --reader-placeholder: rgba(52, 45, 37, .56);
  --reader-success: #3f6948;
  --reader-error-text: #984343;
  --reader-bg-warm-glow: rgba(125, 97, 65, .1);
  --reader-bg-accent-glow: rgba(62, 74, 104, .07);
  --reader-bg-line: rgba(52, 45, 37, .024);
  --reader-page-edge: rgba(52, 45, 37, .042);
  --page-shadow-color: rgba(55, 43, 31, .1);
  --cover-glow: rgba(125, 97, 65, .14);
  --reader-shadow: 0 18px 52px rgba(55, 43, 31, .14);
}

[data-reader-theme="dark"] {
  color-scheme: dark;
  --reader-bg: #15171b;
  --reader-paper: #1d2128;
  --reader-paper-soft: #242a34;
  --reader-text: #eee8dc;
  --reader-heading: #f5f0e7;
  --reader-muted: rgba(238, 232, 220, .76);
  --reader-subtle: rgba(238, 232, 220, .64);
  --reader-faint: rgba(238, 232, 220, .14);
  --reader-rule: rgba(238, 232, 220, .2);
  --reader-border: rgba(238, 232, 220, .2);
  --reader-accent: #b8c4ea;
  --reader-accent-strong: #d4dcf5;
  --reader-accent-soft: rgba(184, 196, 234, .15);
  --reader-warm: #d4b98d;
  --reader-focus: #d5ddff;
  --reader-control-bg: rgba(29, 33, 40, .96);
  --reader-control-border: rgba(238, 232, 220, .22);
  --reader-input-bg: #232832;
  --reader-input-text: #f2ece2;
  --reader-placeholder: rgba(242, 236, 226, .64);
  --reader-success: #a8d6af;
  --reader-error-text: #f1aaa4;
  --reader-bg-warm-glow: rgba(212, 185, 141, .055);
  --reader-bg-accent-glow: rgba(184, 196, 234, .045);
  --reader-bg-line: rgba(238, 232, 220, .018);
  --reader-page-edge: rgba(238, 232, 220, .038);
  --page-shadow-color: rgba(0, 0, 0, .24);
  --cover-glow: rgba(184, 196, 234, .1);
  --reader-shadow: 0 22px 64px rgba(0, 0, 0, .34);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--reader-bg);
  overflow-x: clip;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  background: var(--reader-stage-bg), var(--reader-bg);
  color: var(--reader-text);
  font-family: var(--reader-serif);
  transition: background-color .22s ease, color .22s ease;
}

@supports not (overflow: clip) {
  html,
  body {
    overflow-x: hidden;
  }
}

body.is-paginating .reader-pages {
  opacity: .32;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--reader-focus);
  outline-offset: 3px;
}

.reader-skip-link {
  position: absolute;
  top: -120px;
  left: 16px;
  z-index: 60;
  padding: 10px 14px;
  background: var(--reader-text);
  color: var(--reader-paper);
  font-family: var(--reader-sans);
  font-size: .82rem;
  font-weight: 700;
  transition: top .18s ease;
}

.reader-skip-link:focus {
  top: 14px;
}

.reader-toolbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, auto);
  align-items: center;
  gap: clamp(12px, 2.5vw, 28px);
  min-height: 74px;
  padding: 9px clamp(14px, 3vw, 34px);
  border-bottom: 1px solid var(--reader-control-border);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--toolbar-accent) 8%, transparent), transparent),
    color-mix(in srgb, var(--reader-bg) 92%, var(--reader-paper));
  backdrop-filter: blur(16px);
  font-family: var(--reader-sans);
}

.reader-toolbar::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--toolbar-accent) 58%, transparent), transparent);
  opacity: .78;
  pointer-events: none;
}

.reader-toolbar__identity {
  display: grid;
  min-width: 0;
  gap: 2px;
}

.reader-brand,
.reader-series,
.reader-title,
.reader-status {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reader-brand,
.reader-series {
  color: var(--reader-subtle);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .12em;
  line-height: 1.2;
  text-transform: uppercase;
}

.reader-brand {
  color: var(--toolbar-accent);
}

.reader-title {
  color: var(--reader-heading);
  font-family: var(--reader-display);
  font-size: clamp(1.22rem, 2vw, 1.58rem);
  font-weight: 700;
  line-height: 1.12;
}

.reader-toolbar__controls,
.reader-toolbar__primary,
.reader-toolbar__secondary {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.reader-toolbar__controls {
  justify-content: end;
}

.reader-toolbar__primary {
  justify-content: space-between;
}

.reader-toolbar__secondary {
  justify-content: center;
}

.reader-control,
.reader-control:visited {
  min-height: 34px;
  border: 1px solid var(--reader-control-border);
  border-radius: 0;
  padding: 7px 11px;
  background: var(--reader-control-bg);
  color: var(--reader-muted);
  font-family: var(--reader-sans);
  font-size: .76rem;
  font-weight: 700;
  line-height: 1;
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}

.reader-control:hover,
.reader-control[aria-pressed="true"],
.reader-theme-select:focus {
  border-color: color-mix(in srgb, var(--toolbar-accent) 44%, var(--reader-control-border));
  background: var(--reader-accent-soft);
  color: var(--toolbar-accent);
}

.reader-control:disabled {
  cursor: not-allowed;
  opacity: .58;
}

.reader-control--exit {
  color: var(--reader-text);
}

.reader-control--icon {
  min-width: 46px;
  padding-inline: 9px;
}

.reader-control-group,
.reader-theme-switcher {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-width: 0;
}

.reader-control-label {
  color: var(--reader-subtle);
  font-size: .66rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.reader-theme-select {
  min-width: 86px;
  padding-right: 20px;
}

.reader-toolbar__more {
  position: relative;
  min-width: 0;
}

.reader-toolbar__more > summary {
  display: inline-grid;
  min-width: 42px;
  place-items: center;
  list-style: none;
}

.reader-toolbar__more > summary::-webkit-details-marker {
  display: none;
}

.reader-toolbar__more-panel {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 40;
  display: grid;
  gap: 8px;
  min-width: max-content;
  padding: 9px;
  border: 1px solid color-mix(in srgb, var(--toolbar-accent) 24%, var(--reader-control-border));
  background: var(--reader-control-bg);
  box-shadow: 0 16px 34px rgba(20, 28, 38, .16);
}

.reader-toolbar__more:not([open]) .reader-toolbar__more-panel {
  display: none;
}

.reader-status {
  color: var(--reader-muted);
  font-size: .72rem;
  font-weight: 650;
  line-height: 1.2;
}

.reader-progress {
  flex: 0 1 190px;
  display: grid;
  grid-template-columns: auto minmax(74px, 160px);
  align-items: center;
  justify-content: end;
  gap: 10px;
  min-width: 104px;
  color: var(--reader-muted);
  font-family: var(--reader-sans);
  font-size: .76rem;
  font-weight: 700;
}

.reader-progress__track {
  position: relative;
  display: block;
  height: 2px;
  overflow: hidden;
  background: var(--reader-faint);
}

.reader-progress__track span {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: var(--progress-accent);
  transition: width .18s ease;
}

.reader-stage {
  width: 100%;
  padding: clamp(28px, 5vw, 70px) clamp(14px, 4vw, 48px) clamp(84px, 11vw, 150px);
}

@media (min-width: 900px) {
  body.reader-book .reader-stage {
    padding-top: clamp(18px, 1.8vw, 28px);
  }
}

.reader-pages {
  display: grid;
  gap: clamp(34px, 5vw, 62px);
  transition: opacity .18s ease;
}

body[data-reader-protected="true"] .book-page__content {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

body[data-reader-protected="true"] .feedback-panel,
body[data-reader-protected="true"] .feedback-panel * {
  -webkit-user-select: text;
  user-select: text;
  -webkit-touch-callout: default;
}

.reader-watermark-layer {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-content: space-around;
  gap: 18px 6px;
  overflow: hidden;
  pointer-events: none;
  transform: translateX(var(--reader-watermark-offset, 0));
  opacity: .055;
  color: var(--reader-ink);
  mix-blend-mode: multiply;
}

.reader-watermark-layer span {
  width: 220px;
  justify-self: center;
  transform: rotate(-28deg);
  font-family: var(--reader-sans);
  font-size: 10px;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
  overflow-wrap: anywhere;
}

.book-page__content,
.book-page__number {
  position: relative;
  z-index: 1;
}

[data-reader-theme="dark"] .reader-watermark-layer {
  mix-blend-mode: screen;
  opacity: .075;
}

@media print {
  .reader-toolbar,
  .contents-drawer,
  .contents-backdrop,
  .reader-skip-link,
  .feedback-panel,
  .reader-feedback-toggle {
    display: none !important;
  }

  .reader-watermark-layer {
    position: absolute;
    inset: 0;
    display: grid !important;
    opacity: .16 !important;
    color: #444 !important;
    mix-blend-mode: multiply !important;
  }

  .book-page {
    break-after: page;
    box-shadow: none !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reader-watermark-layer {
    transform: none;
  }
}

.reader-loading {
  position: fixed;
  left: 50%;
  top: calc(50% + 24px);
  z-index: 20;
  display: none;
  min-width: 220px;
  padding: 13px 18px;
  border: 1px solid var(--reader-rule);
  background: var(--reader-control-bg);
  color: var(--reader-muted);
  font-family: var(--reader-sans);
  font-size: .82rem;
  font-weight: 700;
  text-align: center;
  transform: translate(-50%, -50%);
}

body.is-paginating .reader-loading {
  display: block;
}

.reader-error,
.reader-noscript {
  width: min(100%, 620px);
  margin: 90px auto;
  color: var(--reader-muted);
  font-family: var(--reader-sans);
  text-align: center;
}

.reader-access-message {
  width: min(100%, 620px);
  display: grid;
  gap: 14px;
  margin: 90px auto;
  padding: 28px;
  border: 1px solid var(--reader-border);
  border-radius: 8px;
  background: var(--reader-paper);
  box-shadow: var(--reader-shadow);
  font-family: var(--reader-sans);
  text-align: center;
}

.reader-access-message .reader-error,
.reader-access-message p {
  width: auto;
  margin: 0;
}

.book-page {
  position: relative;
  width: min(100%, var(--page-width));
  height: var(--page-height);
  margin-inline: auto;
  padding: var(--page-padding-block) var(--page-padding-inline);
  border-inline: 1px solid var(--reader-rule);
  background:
    linear-gradient(90deg, var(--reader-page-edge), transparent 20px, transparent calc(100% - 20px), var(--reader-page-edge)),
    var(--reader-paper);
  box-shadow:
    var(--reader-shadow),
    0 0 48px var(--page-shadow-color);
}

.book-page::before,
.book-page::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.book-page::before {
  inset: 16px 18px;
  border-top: 1px solid var(--reader-faint);
  border-bottom: 1px solid var(--reader-faint);
}

.book-page::after {
  top: 0;
  bottom: 0;
  left: 15px;
  width: 1px;
  background: color-mix(in srgb, var(--reader-warm) 24%, transparent);
  opacity: .45;
}

.book-page__content {
  position: relative;
  z-index: 1;
  height: calc(var(--page-height) - (var(--page-padding-block) * 2));
  overflow: hidden;
  font-size: var(--reader-body-size);
  line-height: 1.7;
}

.book-page__number {
  position: absolute;
  right: var(--page-padding-inline);
  bottom: 30px;
  z-index: 1;
  color: var(--reader-subtle);
  font-family: var(--reader-sans);
  font-size: .72rem;
}

.book-page[data-no-page-number="true"] .book-page__number {
  display: none;
}

.flow-block {
  break-inside: avoid;
}

.reader-cover-page {
  display: grid;
  height: 100%;
  align-items: center;
  justify-items: center;
}

.reader-cover-page__frame {
  display: grid;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-items: center;
  box-shadow: inset 0 0 92px var(--cover-glow);
}

.reader-cover-page__image {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 100%;
  object-fit: contain;
}

.flow-opening {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(116px, 180px);
  gap: clamp(26px, 5vw, 50px);
  height: 100%;
  align-items: center;
}

.flow-opening__copy {
  display: grid;
  gap: 18px;
  align-content: center;
}

.flow-opening__series,
.flow-opening__book-number,
.unit-header__phase,
.contents-drawer__eyebrow,
.feedback-kicker {
  margin: 0;
  color: var(--reader-warm);
  font-family: var(--reader-sans);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
  line-height: 1.4;
  text-transform: uppercase;
}

.flow-opening h1,
.unit-header h1,
.contents-drawer h2,
.feedback-panel h2 {
  margin: 0;
  color: var(--reader-heading);
  font-family: var(--reader-display);
  font-weight: 600;
  letter-spacing: 0;
}

.flow-opening h1 {
  max-width: 8.5ch;
  font-size: clamp(4.6rem, 10vw, 7rem);
  line-height: .86;
}

.flow-opening__subtitle {
  max-width: 24ch;
  margin: 0;
  color: var(--reader-muted);
  font-size: clamp(1.05rem, 2vw, 1.24rem);
  font-style: italic;
  line-height: 1.55;
}

.flow-opening__author,
.flow-opening__book-number,
.flow-opening__publisher {
  margin: 0;
  color: var(--reader-muted);
  font-family: var(--reader-sans);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.flow-opening__cover {
  width: min(100%, 178px);
  aspect-ratio: 2 / 3;
  justify-self: end;
  object-fit: cover;
  border: 1px solid var(--reader-rule);
  filter: saturate(.86) contrast(.98);
  box-shadow:
    0 18px 42px rgba(39, 51, 64, .12),
    0 0 44px var(--cover-glow);
}

.unit-header {
  display: grid;
  gap: 10px;
  min-height: 190px;
  align-content: center;
  padding-block: 14px 28px;
  text-align: center;
}

.unit-header--chapter {
  min-height: 290px;
  padding-block: 34px 38px;
}

.unit-header__number {
  margin: 0;
  color: var(--chapter-accent);
  font-family: var(--reader-display);
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  font-weight: 600;
}

.unit-header h1 {
  max-width: 11ch;
  margin-inline: auto;
  font-size: clamp(3.25rem, 8.8vw, 5.4rem);
  line-height: .95;
}

.unit-header:not(.unit-header--chapter) h1 {
  max-width: 14ch;
  font-size: clamp(3rem, 7vw, 4.6rem);
  line-height: .98;
}

.unit-header__subtitle {
  max-width: 18ch;
  margin: 2px auto 0;
  color: var(--reader-muted);
  font-family: var(--reader-display);
  font-size: clamp(1.4rem, 3.6vw, 2.15rem);
  font-style: italic;
  line-height: 1.05;
}

.reader-paragraph,
.source-contents p {
  margin: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
  color: var(--reader-text);
}

.reader-paragraph + .reader-paragraph {
  margin-top: .42em;
  text-indent: 1.25em;
}

.unit-header + .reader-paragraph,
.reader-section-break + .reader-paragraph,
.reader-quote + .reader-paragraph,
.source-contents + .reader-paragraph {
  text-indent: 0;
}

.reader-paragraph strong {
  font-weight: 700;
}

.reader-paragraph em {
  font-style: italic;
}

.reader-quote {
  margin: 1.6em auto;
  padding: 1.1em 0 1.05em clamp(18px, 4vw, 28px);
  border-left: 2px solid color-mix(in srgb, var(--chapter-accent) 42%, transparent);
  color: var(--chapter-accent);
  font-family: var(--reader-display);
  font-size: clamp(1.36rem, 3.4vw, 1.78rem);
  font-style: italic;
  line-height: 1.22;
}

.reader-section-break {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 4em;
}

.reader-section-break::before {
  content: "";
  width: 54px;
  height: 1px;
  background: color-mix(in srgb, var(--section-break-accent) 46%, transparent);
}

.reader-space {
  height: 1.2em;
}

.source-contents {
  display: grid;
  gap: 8px;
  max-width: 520px;
  margin: 0 auto;
  color: var(--reader-muted);
  font-family: var(--reader-sans);
  font-size: .9rem;
  line-height: 1.5;
}

.source-contents-row + .source-contents-row {
  margin-top: 7px;
}

.source-contents__heading {
  margin-top: 14px;
  color: var(--reader-accent);
  font-family: var(--reader-display);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.1;
}

.source-contents__chapter {
  color: var(--reader-text);
}

.dedication-page {
  display: grid;
  height: 100%;
  align-content: center;
  justify-items: center;
  text-align: center;
}

.dedication-page .unit-header {
  min-height: 0;
  padding: 0 0 34px;
}

.dedication-page .reader-paragraph {
  max-width: 30ch;
  color: var(--reader-accent);
  font-family: var(--reader-display);
  font-size: clamp(1.55rem, 4vw, 2.25rem);
  line-height: 1.18;
  text-indent: 0;
}

.dedication-page .reader-paragraph + .reader-paragraph {
  margin-top: .32em;
}

.book-end {
  display: grid;
  height: 100%;
  align-content: center;
  justify-items: center;
  gap: 18px;
  text-align: center;
}

.book-end__mark {
  width: 62px;
  height: 1px;
  background: color-mix(in srgb, var(--feedback-accent) 42%, transparent);
}

.book-end h2 {
  margin: 0;
  color: var(--reader-text);
  font-family: var(--reader-display);
  font-size: clamp(3rem, 8vw, 4.8rem);
  font-weight: 600;
  line-height: .95;
}

.book-end p {
  max-width: 34ch;
  margin: 0;
  color: var(--reader-muted);
  font-family: var(--reader-sans);
  font-size: .9rem;
  line-height: 1.55;
}

.feedback-panel {
  width: min(100%, 480px);
  max-height: min(440px, calc(var(--page-height) - 260px));
  margin-top: 8px;
  padding-top: 18px;
  border-top: 1px solid color-mix(in srgb, var(--feedback-accent) 34%, var(--reader-rule));
  overflow: auto;
  text-align: left;
}

.feedback-panel[hidden] {
  display: none;
}

.feedback-panel h2 {
  margin-bottom: 14px;
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1;
  text-align: center;
}

.feedback-panel form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  font-family: var(--reader-sans);
}

.feedback-panel label {
  display: grid;
  gap: 6px;
  color: var(--reader-muted);
  font-size: .78rem;
  font-weight: 700;
}

.feedback-panel label:has(textarea),
.feedback-panel__status,
.feedback-panel__actions {
  grid-column: 1 / -1;
}

.feedback-panel input,
.feedback-panel select,
.feedback-panel textarea {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--reader-border);
  border-radius: 0;
  padding: 9px 10px;
  background: var(--reader-input-bg);
  color: var(--reader-input-text);
}

.feedback-panel input::placeholder,
.feedback-panel textarea::placeholder {
  color: var(--reader-placeholder);
  opacity: 1;
}

.feedback-panel select:invalid {
  color: var(--reader-placeholder);
}

.feedback-panel option {
  background: var(--reader-input-bg);
  color: var(--reader-input-text);
}

.feedback-panel textarea {
  min-height: 104px;
  resize: vertical;
}

.feedback-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.feedback-panel__status {
  min-height: 1.4em;
  margin: 0;
  color: var(--reader-muted);
  font-size: .82rem;
  text-align: center;
}

.feedback-panel__status[data-state="success"] {
  color: var(--reader-success);
}

.feedback-panel__status[data-state="error"] {
  color: var(--reader-error-text);
}

[data-reader-theme="dark"] .reader-control:hover,
[data-reader-theme="dark"] .reader-control[aria-pressed="true"],
[data-reader-theme="dark"] .reader-theme-select:focus {
  color: var(--reader-accent-strong);
}

.contents-backdrop {
  position: fixed;
  inset: 0;
  z-index: 39;
  background: rgba(16, 18, 22, .28);
}

.contents-drawer {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 40;
  width: min(380px, calc(100vw - 38px));
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 18px;
  padding: 24px;
  border-right: 1px solid color-mix(in srgb, var(--drawer-accent) 30%, var(--reader-rule));
  background: var(--reader-paper);
  box-shadow:
    18px 0 58px rgba(20, 23, 28, .18),
    0 0 42px color-mix(in srgb, var(--drawer-accent) 12%, transparent);
  transform: translateX(-105%);
  transition: transform .22s ease;
}

.contents-drawer[aria-hidden="true"] {
  display: none;
}

.contents-drawer.is-open {
  display: grid;
  transform: translateX(0);
}

.contents-drawer__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.contents-drawer h2 {
  font-size: 2.7rem;
  line-height: .9;
}

.contents-list {
  display: grid;
  align-content: start;
  gap: 5px;
  min-height: 0;
  overflow-y: auto;
  padding-right: 6px;
  font-family: var(--reader-sans);
}

.contents-list button {
  width: 100%;
  border: 0;
  border-left: 2px solid transparent;
  border-radius: 0;
  padding: 9px 10px 9px 12px;
  background: transparent;
  color: var(--reader-muted);
  text-align: left;
}

.contents-list button:hover,
.contents-list button[aria-current="true"] {
  border-left-color: var(--drawer-accent);
  background: var(--reader-accent-soft);
  color: var(--reader-text);
}

.contents-list__label {
  display: block;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.contents-list__title {
  display: block;
  margin-top: 2px;
  font-family: var(--reader-display);
  font-size: 1.24rem;
  line-height: 1.05;
}

@media (max-width: 1100px) {
  .reader-toolbar {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .reader-toolbar__identity {
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 16px;
    max-width: 100%;
  }

  .reader-title {
    grid-column: 1 / -1;
  }

  .reader-series::before {
    content: "/ ";
    color: var(--toolbar-accent);
  }

  .reader-status {
    display: none;
  }

  .reader-toolbar__controls {
    width: 100%;
    justify-content: space-between;
  }

  .reader-progress {
    flex: 1 1 180px;
  }
}

@media (max-width: 760px) {
  :root {
    --page-width: calc(100vw - 28px);
    --page-height: min(900px, calc(100svh - 124px));
    --page-padding-block: 42px;
    --page-padding-inline: 22px;
  }

  .reader-toolbar {
    grid-template-columns: 1fr;
    min-height: 0;
    gap: 8px;
    padding: 8px 10px;
  }

  .reader-toolbar__identity {
    gap: 1px;
  }

  .reader-brand,
  .reader-series {
    font-size: .58rem;
    letter-spacing: .095em;
  }

  .reader-title {
    font-size: clamp(1.02rem, 4vw, 1.2rem);
  }

  .reader-status {
    font-size: .66rem;
  }

  .reader-toolbar__controls {
    display: grid;
    grid-template-columns: auto minmax(54px, 1fr) auto auto auto;
    width: 100%;
    gap: 5px;
    align-items: center;
  }

  .reader-control {
    min-height: 30px;
    padding: 6px 8px;
    font-size: .72rem;
  }

  .reader-control--icon {
    min-width: 0;
  }

  body.reader-book .reader-control--exit {
    font-size: 0;
  }

  body.reader-book .reader-control--exit::after {
    content: "Exit";
    font-size: .72rem;
  }

  .reader-progress {
    grid-template-columns: auto minmax(42px, 1fr);
    min-width: 0;
    gap: 7px;
    font-size: .68rem;
  }

  .reader-theme-switcher {
    gap: 3px;
  }

  .reader-control-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .reader-theme-select {
    min-width: 68px;
    max-width: 76px;
    padding-inline: 7px 16px;
  }

  .reader-toolbar__more-panel {
    right: 0;
  }

  .reader-stage {
    padding: 18px 14px 66px;
  }

  .book-page {
    border-inline: 0;
    box-shadow: 0 14px 42px rgba(37, 47, 59, .08);
  }

  .book-page::before {
    inset: 12px;
  }

  .book-page::after {
    left: 10px;
  }

  .book-page__content {
    font-size: max(17px, var(--reader-body-size));
    line-height: 1.68;
  }

  .book-page__number {
    right: 22px;
    bottom: 20px;
  }

  .flow-opening {
    grid-template-columns: 1fr;
    gap: 18px;
    text-align: center;
  }

  .flow-opening__copy {
    gap: 12px;
    justify-items: center;
  }

  .flow-opening h1 {
    max-width: 8.5ch;
    font-size: clamp(3.15rem, 15.6vw, 4.6rem);
  }

  .flow-opening__subtitle {
    font-size: clamp(1rem, 4vw, 1.12rem);
    line-height: 1.42;
  }

  .flow-opening__cover {
    width: min(40vw, 132px);
    justify-self: center;
  }

  .unit-header,
  .unit-header--chapter {
    min-height: 210px;
    padding-block: 24px 28px;
  }

  .unit-header h1,
  .unit-header:not(.unit-header--chapter) h1 {
    max-width: 12ch;
    font-size: clamp(2.75rem, 14vw, 4.2rem);
  }

  .feedback-panel form {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .book-page--feedback.is-feedback-expanded {
    height: auto;
    min-height: var(--page-height);
  }

  .book-page--feedback.is-feedback-expanded .book-page__content {
    height: auto;
    min-height: calc(var(--page-height) - (var(--page-padding-block) * 2));
    overflow: visible;
  }

  .book-page--feedback.is-feedback-expanded .book-end {
    height: auto;
    min-height: calc(var(--page-height) - (var(--page-padding-block) * 2));
    align-content: start;
  }

  .book-end > [data-feedback-toggle] {
    min-height: 44px;
  }

  .book-page--feedback.is-feedback-expanded .feedback-panel {
    width: 100%;
    max-height: none;
    margin-top: 4px;
    padding: 20px 18px 18px;
    overflow: visible;
    scroll-margin-top: 122px;
  }

  .feedback-panel form {
    min-width: 0;
    gap: 14px;
  }

  .feedback-panel label {
    min-width: 0;
    font-size: .875rem;
  }

  .feedback-panel label:has(input[name="name"]) {
    order: 1;
  }

  .feedback-panel label:has(input[name="email"]) {
    order: 2;
  }

  .feedback-panel label:has(select[name="occupation"]) {
    order: 3;
  }

  .feedback-panel label:has(select[name="rating"]) {
    order: 4;
  }

  .feedback-panel label:has(textarea[name="feedback"]) {
    order: 5;
  }

  .feedback-panel__actions {
    order: 6;
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .feedback-panel__status {
    order: 7;
    font-size: .875rem;
  }

  .feedback-panel input,
  .feedback-panel select,
  .feedback-panel textarea,
  .feedback-panel__actions .reader-control {
    box-sizing: border-box;
    width: 100%;
    min-width: 0;
    min-height: 44px;
  }

  .feedback-panel input,
  .feedback-panel select,
  .feedback-panel textarea {
    font-size: 16px;
    scroll-margin-top: 136px;
  }

  .feedback-panel textarea {
    min-height: 132px;
  }
}

@media (min-width: 1440px) {
  :root {
    --page-width: 680px;
    --page-height: 1000px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}