:root {
  color-scheme: light;
  --paper: #eeeadf;
  --paper-light: #f7f4ec;
  --paper-deep: #e3ded0;
  --ink: #26251f;
  --ink-soft: #58574f;
  --ink-faint: #79776c;
  --line: rgba(48, 47, 41, 0.2);
  --line-soft: rgba(48, 47, 41, 0.1);
  --moss: #667166;
  --wine: #734c50;
  --serif: "Iowan Old Style", "Baskerville", "Libre Baskerville", "Songti SC", STSong,
    "Source Han Serif SC", SimSun, "Times New Roman", serif;
  --sans: "Avenir Next", Avenir, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial,
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--paper);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 14% 6%, rgba(255, 255, 255, 0.5), transparent 24rem),
    linear-gradient(112deg, rgba(104, 116, 123, 0.035), transparent 46%),
    var(--paper);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--wine);
  outline-offset: 4px;
}

::selection {
  color: var(--paper-light);
  background: var(--wine);
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.55rem 0.8rem;
  color: var(--paper-light);
  background: var(--ink);
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.page {
  width: min(100%, 1600px);
  min-height: 100vh;
  margin: 0 auto;
  padding: 0 2.2rem 4rem;
}

.masthead {
  min-height: 7.2rem;
  display: grid;
  grid-template-columns: 1fr minmax(18rem, 2fr) 1fr;
  align-items: center;
  gap: 2rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--sans);
}

.archive-mark,
.copy-mark,
.publication-title p,
.publication-title span {
  margin: 0;
}

.archive-mark,
.copy-mark {
  color: var(--ink-faint);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.copy-mark {
  text-align: right;
}

.masthead-tools {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.55rem;
}

.masthead-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
}

.music-toggle {
  min-height: 1.75rem;
  padding: 0.25rem 0;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--ink-faint);
  background: transparent;
  border: 0;
  border-bottom: 1px solid transparent;
  border-radius: 0;
  font-family: var(--sans);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  line-height: 1;
  cursor: pointer;
}

.music-toggle:hover,
.music-toggle[aria-pressed="true"] {
  color: var(--ink);
}

.music-toggle[aria-pressed="true"] {
  border-bottom-color: currentcolor;
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  line-height: 1;
}

.language-switch button {
  min-width: 1.75rem;
  min-height: 1.75rem;
  padding: 0.25rem;
  color: var(--ink-faint);
  background: transparent;
  border: 0;
  border-bottom: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
}

.language-switch button:hover,
.language-switch button[aria-pressed="true"] {
  color: var(--ink);
}

.language-switch button[aria-pressed="true"] {
  border-bottom-color: currentcolor;
}

.publication-title {
  text-align: center;
}

.publication-title p {
  color: var(--ink);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.publication-title span {
  display: block;
  margin-top: 0.18rem;
  color: var(--ink-faint);
  font-family: var(--serif);
  font-size: 0.78rem;
  font-style: italic;
  letter-spacing: 0.02em;
}

.archive-shell {
  display: grid;
  grid-template-columns: minmax(11rem, 0.75fr) minmax(31rem, 2.25fr) minmax(16rem, 1fr);
  gap: clamp(2rem, 4vw, 5.5rem);
  align-items: start;
  padding-top: clamp(2.5rem, 5vw, 5.5rem);
}

.chapter-index,
.poem-shelf {
  position: sticky;
  top: 2rem;
  min-width: 0;
}

.column-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  min-height: 1.8rem;
  padding-bottom: 0.55rem;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 0.61rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  line-height: 1.3;
  text-transform: uppercase;
}

.column-heading span:last-child {
  flex: 0 0 auto;
  font-weight: 400;
}

.chapter-list {
  display: grid;
}

.index-entry {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: 1.65rem minmax(0, 1fr);
  gap: 0.55rem;
  padding: 0.9rem 0.2rem 0.88rem 0;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  cursor: pointer;
  transition: color 180ms ease, padding-left 180ms ease;
}

.index-entry::before {
  position: absolute;
  top: 50%;
  left: -0.85rem;
  width: 0.28rem;
  height: 0.28rem;
  content: "";
  background: currentcolor;
  border-radius: 50%;
  opacity: 0;
  transform: translateY(-50%);
}

.index-entry:hover:not(:disabled) {
  color: var(--ink);
  padding-left: 0.16rem;
}

.index-entry[aria-current="page"] {
  color: var(--ink);
  padding-left: 0.16rem;
}

.index-entry[aria-current="page"]::before {
  opacity: 1;
}

.index-entry:disabled {
  color: var(--ink-faint);
  cursor: default;
  opacity: 0.42;
}

.index-reference {
  padding-top: 0.08rem;
  color: inherit;
  font-family: var(--sans);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
}

.index-copy,
.index-title,
.index-subtitle {
  display: block;
  min-width: 0;
}

.index-title {
  font-size: 0.82rem;
  line-height: 1.28;
}

.index-subtitle {
  margin-top: 0.2rem;
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 0.54rem;
  letter-spacing: 0.08em;
  line-height: 1.4;
  text-transform: uppercase;
}

.reading-panel {
  min-width: 0;
  min-height: calc(100vh - 11rem);
  outline: none;
  scroll-margin-top: 1.5rem;
}

.document {
  width: min(100%, 42rem);
  margin: 0 auto;
}

.document-meta {
  margin: 0 0 2.2rem;
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 0.58rem;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}

.letter-document {
  padding: clamp(2.4rem, 5vw, 4.8rem) clamp(1.6rem, 5vw, 4.9rem) 3rem;
  background: rgba(249, 247, 240, 0.66);
  border-top: 1px solid rgba(255, 255, 255, 0.78);
  box-shadow: 0 1.5rem 5rem rgba(47, 43, 35, 0.055);
}

.letter-salutation {
  max-width: 30rem;
  margin: 0 0 2.7rem;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.018em;
  line-height: 1.25;
}

.letter-body {
  max-width: 33rem;
  margin-left: auto;
  font-size: clamp(1rem, 1.2vw, 1.08rem);
  line-height: 1.78;
}

.letter-body > p {
  margin: 0 0 1.35rem;
}

.letter-body .letter-closing {
  margin-top: 2rem;
}

.signature {
  margin-top: 2.7rem !important;
  color: var(--ink-soft);
  font-size: 1.2rem;
  font-style: italic;
  text-align: right;
}

.opening-control {
  width: min(100%, 33rem);
  margin: 3.3rem 0 0 auto;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  text-align: right;
}

.open-button,
.begin-link,
.sequence-button {
  padding: 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid currentcolor;
  border-radius: 0;
  font-family: var(--sans);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  line-height: 1.8;
  text-transform: uppercase;
  cursor: pointer;
}

.open-button {
  position: relative;
  padding-right: 1.6rem;
}

.open-button::after {
  position: absolute;
  right: 0;
  content: "→";
  transition: transform 180ms ease;
}

.open-button:hover::after {
  transform: translateX(0.28rem);
}

.manuscript-opened {
  margin: 0;
  color: var(--moss);
  font-family: var(--sans);
  font-size: 0.61rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.poem-document,
.coda-document {
  padding-top: clamp(1rem, 6vh, 4rem);
}

.poem-title,
.coda-title {
  margin: 0;
  font-size: clamp(2.5rem, 5vw, 4.7rem);
  font-weight: 400;
  letter-spacing: -0.038em;
  line-height: 0.98;
}

.chapter-introduction {
  max-width: 27rem;
  margin: 1.2rem 0 0;
  color: var(--ink-faint);
  font-size: 0.83rem;
  font-style: italic;
  line-height: 1.55;
}

.poem-body {
  margin: clamp(4.5rem, 10vh, 7rem) 0 clamp(5rem, 13vh, 9rem) clamp(0rem, 6vw, 5rem);
  font-size: clamp(1.24rem, 2vw, 1.6rem);
  line-height: 1.68;
}

.poem-stanza {
  margin: 0 0 1.65rem;
}

.poem-line {
  display: block;
}

.reading-sequence {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.sequence-button {
  justify-self: start;
  color: var(--ink-soft);
  border-bottom-color: transparent;
  font-size: 0.55rem;
  letter-spacing: 0.06em;
  text-align: left;
  text-transform: none;
}

.sequence-button:hover {
  color: var(--ink);
  border-bottom-color: currentcolor;
}

.sequence-button--next {
  justify-self: end;
  text-align: right;
}

.coda-title {
  max-width: 36rem;
  font-size: clamp(2.45rem, 5vw, 4.35rem);
  line-height: 1.02;
}

.coda-prefix {
  display: block;
  margin-bottom: 0.6rem;
  color: var(--wine);
  font-family: var(--sans);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.coda-body {
  max-width: 35rem;
  margin: clamp(3.5rem, 8vh, 5.5rem) 0 0 clamp(0rem, 4vw, 3rem);
  font-size: clamp(1rem, 1.3vw, 1.08rem);
  line-height: 1.78;
}

.coda-salutation {
  margin: 0 0 2.5rem;
  font-size: 1.18rem;
  font-style: italic;
}

.coda-block {
  margin: 0 0 1.45rem;
}

.coda-block--closing {
  margin-bottom: 0.75rem;
}

.coda-block--closing + .coda-block--closing {
  margin-top: 0;
}

.coda-block--final {
  margin: 2.4rem 0 0;
  font-size: 1.13rem;
  font-style: italic;
}

.coda-signature {
  margin: 2.8rem 0 0;
  color: var(--ink-soft);
  font-size: 1.18rem;
  font-style: italic;
  text-align: right;
}

.creator-note {
  margin: clamp(6rem, 14vh, 10rem) 0 5rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line-soft);
}

.creator-note summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem 0;
  cursor: pointer;
  list-style: none;
}

.creator-note summary::-webkit-details-marker {
  display: none;
}

.creator-note-summary,
.creator-note-title,
.creator-note-label {
  display: block;
}

.creator-note-title {
  font-family: var(--sans);
  font-size: 0.63rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.creator-note-label {
  margin-top: 0.18rem;
  color: var(--ink-faint);
  font-size: 0.76rem;
  font-style: italic;
}

.creator-note-marker {
  color: var(--wine);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1;
}

.creator-note-body {
  max-width: 32rem;
  padding: 1.5rem 0 2.8rem clamp(0rem, 4vw, 3rem);
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.72;
}

.creator-note-body p {
  margin: 0 0 1.2rem;
}

.creator-note-body .creator-note-signature {
  margin: 2rem 0 0;
  color: var(--ink);
  font-style: italic;
  text-align: right;
}

.shelf-note {
  min-height: 16rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.5rem 0 0;
  color: var(--ink-soft);
}

.shelf-note p {
  margin: 0;
  max-width: 14rem;
  font-size: 0.83rem;
  line-height: 1.55;
}

.shelf-note small {
  display: block;
  max-width: 13rem;
  margin-top: 0.7rem;
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 0.55rem;
  letter-spacing: 0.025em;
  line-height: 1.6;
}

.shelf-rule {
  width: 100%;
  height: 8.5rem;
  display: block;
  margin-bottom: 1.5rem;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: repeating-linear-gradient(
    90deg,
    transparent 0,
    transparent 0.55rem,
    rgba(48, 47, 41, 0.06) 0.55rem,
    rgba(48, 47, 41, 0.06) 0.6rem
  );
}

.shelf-note--sealed {
  opacity: 0.68;
}

.shelf-note--ready,
.shelf-note--coda {
  justify-content: flex-start;
  min-height: 0;
  padding-top: 2rem;
}

.begin-link {
  align-self: flex-start;
  margin-top: 1.7rem;
  color: var(--moss);
  border-bottom-color: transparent;
  font-size: 0.56rem;
}

.begin-link:hover {
  border-bottom-color: currentcolor;
}

.poem-card-list {
  display: grid;
  gap: 1rem;
  padding-top: 1.3rem;
}

.poem-card {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: clamp(4.4rem, 6.5vw, 5.8rem) minmax(0, 1fr);
  gap: 0.9rem;
  align-items: end;
  padding: 0 0 0.9rem;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  cursor: pointer;
  transition: color 180ms ease, transform 220ms ease;
}

.poem-card::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 0;
  height: 1px;
  content: "";
  background: var(--wine);
  transition: width 220ms ease;
}

.poem-card:hover,
.poem-card--active {
  color: var(--ink);
}

.poem-card:hover::after,
.poem-card--active::after {
  width: 42%;
}

.poem-card--active {
  transform: translateX(-0.45rem);
}

.poem-card-image {
  width: 100%;
  height: auto;
  aspect-ratio: 15 / 19;
  display: block;
  object-fit: cover;
  background: var(--paper-deep);
  border: 1px solid rgba(48, 47, 41, 0.14);
  filter: saturate(0.82) contrast(0.98);
}

.poem-card-copy,
.poem-card-meta,
.poem-card-title,
.poem-card-archive {
  display: block;
  min-width: 0;
}

.poem-card-meta,
.poem-card-archive {
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 0.49rem;
  letter-spacing: 0.1em;
  line-height: 1.35;
  text-transform: uppercase;
}

.poem-card-title {
  margin: 0.28rem 0 0.65rem;
  font-size: 0.83rem;
  line-height: 1.25;
}

.poem-card-archive {
  opacity: 0;
  transform: translateY(0.2rem);
  transition: opacity 180ms ease, transform 180ms ease;
}

.poem-card:hover .poem-card-archive,
.poem-card:focus-visible .poem-card-archive,
.poem-card--active .poem-card-archive {
  opacity: 1;
  transform: translateY(0);
}

.noscript-note {
  max-width: 32rem;
  margin: 2rem auto;
  padding: 1rem;
  border: 1px solid var(--line);
}

.reading-enter {
  animation: readingEnter 380ms ease both;
}

.language-zh .letter-body,
.language-zh .coda-body {
  line-height: 1.95;
}

.language-zh .poem-body {
  letter-spacing: 0.035em;
  line-height: 1.9;
}

@keyframes readingEnter {
  from {
    opacity: 0;
    transform: translateY(0.45rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1080px) {
  .page {
    padding-inline: clamp(1.2rem, 4vw, 2.2rem);
  }

  .archive-shell {
    grid-template-columns: 10.5rem minmax(27rem, 2fr) minmax(13rem, 0.9fr);
    gap: 2rem;
  }

  .poem-card {
    grid-template-columns: 4.2rem minmax(0, 1fr);
    gap: 0.7rem;
  }
}

@media (max-width: 900px) {
  .page {
    padding-bottom: 2rem;
  }

  .masthead {
    min-height: 6.4rem;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 1rem;
  }

  .publication-title {
    text-align: center;
  }

  .copy-mark {
    display: none;
  }

  .masthead-tools {
    align-self: center;
  }

  .language-switch button {
    min-width: 2.25rem;
    min-height: 2.75rem;
  }

  .music-toggle {
    min-height: 2.75rem;
  }

  .archive-shell {
    display: flex;
    flex-direction: column;
    gap: 2.8rem;
    padding-top: 1.6rem;
  }

  .chapter-index,
  .poem-shelf {
    position: static;
    width: 100%;
  }

  .chapter-index {
    order: 1;
  }

  .reading-panel {
    order: 2;
    width: 100%;
    min-height: 0;
    scroll-margin-top: 1rem;
  }

  .poem-shelf {
    order: 3;
  }

  .chapter-list {
    display: flex;
    gap: 0;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
    scroll-snap-type: x proximity;
  }

  .index-entry {
    flex: 0 0 12.5rem;
    scroll-snap-align: start;
    border-right: 1px solid var(--line-soft);
  }

  .index-entry:first-child {
    flex-basis: 9rem;
  }

  .index-entry::before {
    top: auto;
    right: 0.8rem;
    bottom: 0.45rem;
    left: auto;
  }

  .poem-document,
  .coda-document {
    padding-top: 2rem;
  }

  .poem-card-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .poem-card {
    grid-template-columns: 5.2rem minmax(0, 1fr);
  }

  .poem-card--active {
    transform: translateY(-0.3rem);
  }

  .shelf-note {
    min-height: 0;
    padding: 1.5rem 0;
  }

  .shelf-rule {
    height: 4rem;
  }
}

@media (max-width: 580px) {
  body {
    font-size: 16px;
  }

  .page {
    padding-inline: 1rem;
  }

  .masthead {
    min-height: 5.7rem;
  }

  .archive-mark {
    align-self: start;
    padding-top: 1.6rem;
  }

  .publication-title {
    align-self: start;
    padding-top: 1.3rem;
  }

  .masthead-tools {
    align-self: start;
    padding-top: 0.85rem;
  }

  .masthead-controls {
    gap: 0.45rem;
  }

  .publication-title p {
    font-size: 0.65rem;
    letter-spacing: 0.13em;
  }

  .publication-title span {
    font-size: 0.66rem;
    line-height: 1.35;
  }

  .letter-document {
    margin-inline: -0.25rem;
    padding: 2.4rem 1.3rem 2rem 1.65rem;
  }

  .letter-salutation {
    margin-bottom: 2.2rem;
  }

  .poem-title,
  .coda-title {
    font-size: clamp(2.35rem, 13vw, 3.6rem);
  }

  .poem-body {
    margin: 4rem 0 5rem clamp(0rem, 4vw, 1.25rem);
  }

  .reading-sequence {
    gap: 1rem;
  }

  .poem-card-list {
    grid-template-columns: 1fr;
  }

  .poem-card {
    grid-template-columns: 5.5rem minmax(0, 1fr);
  }

}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

}

@media (prefers-contrast: more) {
  :root {
    --ink-soft: #3e3d37;
    --ink-faint: #55544d;
    --line: rgba(38, 37, 31, 0.45);
    --line-soft: rgba(38, 37, 31, 0.3);
  }
}