:root {
  color-scheme: light;
  --paper: #f2f0e9;
  --paper-deep: #e7e3d8;
  --ink: #171611;
  --muted: #666156;
  --line: #bdb7a8;
  --signal: #8d2e24;
  --focus: #a33b2e;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: "Songti SC", STSong, "Noto Serif CJK SC", serif;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --paper: #151411;
  --paper-deep: #1f1d19;
  --ink: #eeece4;
  --muted: #aaa497;
  --line: #4c483f;
  --signal: #da7769;
  --focus: #ed8b7d;
}

* { box-sizing: border-box; }

html { background: var(--paper); }

body {
  min-width: 320px;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

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

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: -80px;
  left: 16px;
  min-height: 44px;
  padding: 12px 16px;
  background: var(--ink);
  color: var(--paper);
}

.skip-link:focus { top: 12px; }

.icon-button {
  display: inline-grid;
  width: 44px;
  height: 44px;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.icon-button:hover {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  font-size: .75rem;
  letter-spacing: 0;
}

/* Catalog */
.catalog-header {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 4vw;
  border-bottom: 1px solid var(--line);
}

.brand-mark {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand-mark strong {
  font-family: var(--serif);
  font-size: 1.25rem;
}

.brand-mark span {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  font-size: .75rem;
}

.catalog-main {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 72px 0 104px;
}

.catalog-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(300px, .7fr);
  gap: 24px 64px;
  align-items: end;
  padding-bottom: 56px;
}

.catalog-intro .eyebrow { grid-column: 1 / -1; }

.catalog-intro h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: 4.5rem;
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: 0;
}

.catalog-deck {
  max-width: 34em;
  margin: 0 0 8px;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.9;
}

.truth-notice {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  margin: 0 0 72px;
  padding: 22px 0;
  border-block: 1px solid var(--signal);
}

.truth-notice strong {
  color: var(--signal);
  font-size: .875rem;
}

.truth-notice p {
  max-width: 58em;
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px 24px;
  align-items: end;
  margin-bottom: 24px;
}

.section-heading .eyebrow { grid-column: 1 / -1; }

.section-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 0;
}

.section-heading > span {
  color: var(--muted);
  font-size: .8125rem;
}

.article-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ink);
  list-style: none;
}

.article-list li { border-bottom: 1px solid var(--line); }

.article-list a {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  min-height: 184px;
  padding: 28px 0;
  text-decoration: none;
}

.article-list a:hover .article-copy strong,
.article-list a:focus-visible .article-copy strong { color: var(--signal); }

.article-number {
  align-self: start;
  color: var(--signal);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  font-size: .8125rem;
}

.article-copy {
  display: grid;
  gap: 12px;
}

.article-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  color: var(--muted);
  font-size: .75rem;
}

.article-copy strong {
  max-width: 26em;
  font-family: var(--serif);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.45;
}

.article-summary {
  max-width: 48em;
  color: var(--muted);
  font-family: var(--serif);
  line-height: 1.8;
}

.article-enter {
  font-size: .8125rem;
  white-space: nowrap;
}

.catalog-footer {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding: 28px 4vw;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .75rem;
  line-height: 1.7;
}

.catalog-footer p { max-width: 46em; margin: 0; }

/* Reader shell */
.reader-page {
  height: 100dvh;
  overflow: hidden;
}

.reader-shell {
  display: grid;
  height: 100dvh;
  grid-template-rows: auto minmax(0, 1fr);
}

.reading-progress {
  position: fixed;
  z-index: 90;
  inset: 0 0 auto;
  height: 3px;
  pointer-events: none;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  margin-left: auto;
  background: var(--signal);
}

.reader-toolbar {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.toolbar-main {
  display: grid;
  min-height: 64px;
  grid-template-columns: auto minmax(180px, 1fr) auto auto;
  gap: 18px;
  align-items: center;
  padding: 8px 3vw;
}

.back-link {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
}

.reader-identity {
  display: flex;
  min-width: 0;
  align-items: baseline;
  gap: 12px;
  margin: 0;
}

.reader-identity strong {
  font-family: var(--serif);
  font-size: 1rem;
}

.reader-identity span {
  overflow: hidden;
  color: var(--muted);
  font-size: .75rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.article-switcher {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: .75rem;
}

.article-switcher select {
  min-height: 44px;
  max-width: 240px;
  padding: 0 36px 0 12px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
}

.reader-actions,
.roll-pager {
  display: flex;
  gap: 6px;
}

.chapter-nav {
  display: flex;
  min-height: 48px;
  align-items: center;
  gap: 16px;
  padding: 0 3vw;
  border-top: 1px solid var(--line);
}

.chapter-prefix {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: .6875rem;
}

.chapter-links {
  display: flex;
  min-width: 0;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.chapter-links a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 12px;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: .8125rem;
  text-decoration: none;
  white-space: nowrap;
}

.chapter-links a:hover { color: var(--ink); }

.chapter-links a[aria-current="location"] {
  border-bottom-color: var(--signal);
  color: var(--signal);
}

.roll-stage {
  position: relative;
  min-height: 0;
  overflow: hidden;
  background:
    linear-gradient(90deg, transparent 0, transparent calc(100% - 1px), var(--line) calc(100% - 1px));
  cursor: grab;
  touch-action: pan-y;
}

.roll-stage.is-dragging { cursor: grabbing; }

.roll-track {
  --roll-pan: 0px;
  position: absolute;
  inset: 0 0 auto auto;
  width: max-content;
  height: 100%;
  padding: 32px 52px;
  transform: translateX(var(--roll-pan));
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--serif);
}

.roll-track.is-jumping {
  transition: transform 420ms cubic-bezier(.22, .61, .36, 1);
}

.roll-head,
.roll-section,
.roll-end {
  margin-block-end: 64px;
}

.roll-head {
  padding-block-end: 44px;
  border-block-end: 1px solid var(--ink);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0 0 28px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: .75rem;
}

.roll-head h1 {
  max-inline-size: 13em;
  margin: 0;
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0;
}

.article-deck {
  max-inline-size: 25em;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 2;
}

.article-boundary {
  display: flex;
  max-inline-size: 28em;
  margin: 32px 0 0;
  padding-inline-start: 16px;
  border-inline-start: 2px solid var(--signal);
  gap: 10px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: .75rem;
  line-height: 1.8;
}

.article-boundary strong { color: var(--signal); }

.roll-section {
  padding-block-start: 4px;
  scroll-margin-top: 120px;
}

.roll-section:focus { outline: none; }

.section-mark {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-block-end: 28px;
  font-family: var(--sans);
}

.section-number {
  display: inline-grid;
  min-width: 30px;
  min-height: 30px;
  place-items: center;
  border: 1px solid var(--signal);
  color: var(--signal);
  font-size: .6875rem;
}

.section-mark div {
  display: flex;
  gap: 8px;
}

.section-mark div > span {
  color: var(--muted);
  font-size: .625rem;
}

.section-mark h2 {
  max-inline-size: 22em;
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.8;
  letter-spacing: 0;
}

.roll-section > p {
  max-inline-size: 34em;
  margin: 0;
  font-size: 1.0625rem;
  line-height: 2.05;
  letter-spacing: .02em;
  text-align: justify;
  text-underline-offset: 3px;
}

.roll-section > p + p { margin-block-start: 1.7em; }

.roll-section > p.narrative {
  padding-block: 20px;
  border-block: 1px solid var(--line);
}

.roll-section > p.emphasis {
  padding-block: 22px;
  color: var(--signal);
  font-size: 1.1875rem;
}

.roll-section blockquote {
  max-inline-size: 30em;
  margin: 0;
  margin-block-start: 1.7em;
  padding-block: 24px;
  padding-inline: 8px;
  border-block: 1px solid var(--signal);
  color: var(--signal);
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.95;
}

.roll-section cite {
  display: block;
  margin-inline-start: 18px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: .75rem;
  font-style: normal;
  font-weight: 400;
}

.latin-run {
  display: inline-block;
  padding-inline: .12em;
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  letter-spacing: 0;
}

.latin-combine {
  font-family: var(--sans);
  text-combine-upright: all;
  letter-spacing: 0;
}

.roll-end {
  display: flex;
  max-inline-size: 32em;
  gap: 22px;
  padding-block-start: 36px;
  border-block-start: 1px solid var(--ink);
  color: var(--muted);
  font-family: var(--sans);
  font-size: .8125rem;
  line-height: 1.85;
}

.end-mark {
  display: grid;
  min-width: 42px;
  min-height: 42px;
  place-items: center;
  margin: 0;
  border: 1px solid var(--signal);
  color: var(--signal);
  font-family: var(--serif);
  font-size: 1.25rem;
}

.roll-end h2 {
  margin: 0;
  color: var(--ink);
  font-size: .9375rem;
}

.roll-end p { margin: 0 0 16px; }

.roll-end a {
  display: inline-flex;
  min-block-size: 44px;
  align-items: center;
  color: var(--signal);
}

@media (max-width: 900px) {
  .catalog-intro h1 { font-size: 3.5rem; }
  .toolbar-main { grid-template-columns: auto 1fr auto; }
  .reader-identity { display: none; }
}

@media (max-width: 800px) {
  .reader-page {
    height: auto;
    overflow: visible;
  }

  .reader-shell {
    display: block;
    height: auto;
  }

  .reader-toolbar { position: static; }

  .toolbar-main {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 10px;
    padding: 8px 16px;
  }

  .back-link span { display: none; }

  .article-switcher {
    min-width: 0;
    justify-content: center;
  }

  .article-switcher > span { display: none; }

  .article-switcher select {
    width: 100%;
    max-width: 320px;
  }

  .roll-pager { display: none; }

  .chapter-nav {
    padding: 0 16px;
  }

  .roll-stage {
    min-height: 0;
    overflow: visible;
    background: none;
    cursor: auto;
    touch-action: auto;
  }

  .roll-track {
    position: static;
    width: min(100% - 40px, 44rem);
    height: auto;
    margin: 0 auto;
    padding: 44px 0 80px;
    transform: none !important;
    writing-mode: horizontal-tb;
    text-orientation: mixed;
  }

  .roll-head,
  .roll-section,
  .roll-end {
    margin: 0 0 64px;
  }

  .roll-head {
    padding: 0 0 36px;
    border: 0;
    border-bottom: 1px solid var(--ink);
  }

  .article-meta {
    margin: 0 0 20px;
  }

  .roll-head h1 {
    max-inline-size: none;
    font-size: 2.25rem;
    line-height: 1.35;
  }

  .article-deck {
    max-inline-size: none;
    margin-top: 20px;
    font-size: 1rem;
    line-height: 1.85;
  }

  .article-boundary {
    display: grid;
    max-inline-size: none;
    margin-top: 28px;
    padding: 0 0 0 14px;
    border: 0;
    border-left: 2px solid var(--signal);
  }

  .roll-section {
    padding: 0;
    scroll-margin-top: 18px;
  }

  .section-mark {
    margin: 0 0 24px;
  }

  .section-number {
    min-width: 32px;
    min-height: 32px;
  }

  .section-mark div {
    display: grid;
    gap: 4px;
  }

  .section-mark h2 {
    max-inline-size: none;
    font-family: var(--serif);
    font-size: 1.5rem;
    line-height: 1.45;
  }

  .roll-section > p {
    max-inline-size: none;
    font-size: 1.0625rem;
    line-height: 2;
    letter-spacing: 0;
    text-align: left;
  }

  .roll-section > p + p { margin: 1.35em 0 0; }

  .roll-section > p.narrative {
    padding: 20px 0;
    border: 0;
    border-block: 1px solid var(--line);
  }

  .roll-section > p.emphasis {
    padding: 20px 0;
  }

  .roll-section blockquote {
    max-inline-size: none;
    margin: 28px 0 0;
    padding: 20px 0 20px 22px;
    border: 0;
    border-left: 2px solid var(--signal);
    font-size: 1.25rem;
    line-height: 1.85;
  }

  .roll-section cite { margin: 16px 0 0; }

  .latin-run {
    display: inline;
    padding: 0;
  }

  .roll-end {
    display: grid;
    max-inline-size: none;
    gap: 18px;
    padding: 32px 0 0;
    border: 0;
    border-top: 1px solid var(--ink);
  }

  .end-mark {
    width: 42px;
    min-width: 42px;
  }
}

@media (max-width: 680px) {
  .catalog-main {
    width: min(100% - 32px, 1180px);
    padding: 48px 0 72px;
  }

  .catalog-intro {
    display: block;
    padding-bottom: 40px;
  }

  .catalog-intro h1 {
    margin-top: 18px;
    font-size: 2.75rem;
  }

  .catalog-deck { margin-top: 24px; }

  .truth-notice {
    display: block;
    margin-bottom: 56px;
  }

  .truth-notice p { margin-top: 10px; }

  .article-list a {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    min-height: 0;
    padding: 28px 0;
  }

  .article-enter { display: none; }

  .article-copy strong { font-size: 1.375rem; }

  .catalog-footer {
    display: grid;
    gap: 10px;
    padding: 24px 16px;
  }

  .chapter-prefix { display: none; }
}

@media (max-width: 420px) {
  .catalog-header { padding-inline: 16px; }
  .brand-mark span { display: none; }
  .catalog-intro h1 { font-size: 2.25rem; }
  .roll-track { width: calc(100% - 32px); }
  .roll-head h1 { font-size: 1.875rem; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}