:root {
  color-scheme: light;
  --paper: #f3efe5;
  --paper-deep: #e9e1d2;
  --surface: #fffdf8;
  --surface-muted: #f8f4eb;
  --ink: #20292b;
  --muted: #646b69;
  --line: #d9d2c5;
  --accent: #165d66;
  --accent-strong: #0e4850;
  --accent-soft: #dcebea;
  --warm: #b75d3e;
  --warm-soft: #f4e3d8;
  --shadow: 0 18px 50px rgba(47, 44, 37, 0.09);
  --radius-lg: 22px;
  --radius-md: 14px;
  --sans: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  --serif: "Noto Serif CJK SC", "Songti SC", SimSun, Georgia, serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: #151b1c;
  --paper-deep: #1d2526;
  --surface: #202829;
  --surface-muted: #263031;
  --ink: #edf1ee;
  --muted: #acb7b4;
  --line: #3a4646;
  --accent: #7fc3c7;
  --accent-strong: #a6dadd;
  --accent-soft: #253f41;
  --warm: #e69a77;
  --warm-soft: #442f29;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.24);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--warm);
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--warm) 70%, transparent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--surface);
  transform: translateY(-160%);
}

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

.reading-progress {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 900;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--warm));
}

.site-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 78%, transparent);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(16px);
}

.site-bar__inner {
  width: min(1180px, calc(100% - 36px));
  min-height: 66px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
  letter-spacing: 0.02em;
}

.brand__mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: var(--surface);
  font-family: Georgia, serif;
  font-size: 17px;
}

.site-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-button,
.text-button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

.icon-button {
  width: 40px;
  padding: 0;
  font-size: 16px;
}

.text-button {
  padding: 7px 14px;
  font-size: 14px;
}

.icon-button:hover,
.text-button:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.index-shell {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: 72px 0 64px;
}

.index-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: end;
  margin-bottom: 42px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--warm);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.index-hero h1 {
  max-width: 760px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(42px, 7vw, 78px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.index-hero__intro {
  max-width: 670px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 2vw, 19px);
}

.edition-badge {
  min-width: 130px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  box-shadow: var(--shadow);
  text-align: center;
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  transform: rotate(4deg);
}

.edition-badge strong {
  display: block;
  color: var(--accent-strong);
  font-family: var(--serif);
  font-size: 30px;
  line-height: 1;
}

.edition-badge span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

.story-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 22px;
}

.story-card {
  grid-column: span 4;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.story-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 55px rgba(47, 44, 37, 0.14);
}

.story-card__cover {
  position: relative;
  min-height: 220px;
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 25% 15%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 38%),
    linear-gradient(145deg, var(--surface-muted), var(--paper-deep));
}

.story-card__cover img {
  width: 100%;
  height: 220px;
  object-fit: contain;
  padding: 18px;
  mix-blend-mode: multiply;
}

[data-theme="dark"] .story-card__cover img {
  mix-blend-mode: normal;
}

.story-card__number {
  color: color-mix(in srgb, var(--accent) 28%, transparent);
  font-family: Georgia, serif;
  font-size: 108px;
  font-weight: 700;
  line-height: 1;
}

.story-card__body {
  padding: 24px;
}

.story-card__kicker {
  margin: 0 0 6px;
  color: var(--warm);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.story-card h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 25px;
  line-height: 1.25;
}

.story-card h2 span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
}

.story-card__summary {
  display: -webkit-box;
  margin: 16px 0 18px;
  overflow: hidden;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 12px;
}

.story-card__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-strong);
  font-weight: 750;
  text-decoration: none;
}

.story-card__actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.story-card__actions .story-card__link {
  justify-content: space-between;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-muted);
  font-size: 13px;
}

.story-card__link--english {
  color: var(--warm);
}

.story-card__link::after {
  content: "→";
  transition: transform 160ms ease;
}

.story-card__link:hover::after {
  transform: translateX(4px);
}

.reader-hero {
  width: min(1280px, calc(100% - 36px));
  margin: 0 auto;
  padding: 58px 0 38px;
}

.reader-hero__crumb {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.reader-hero h1 {
  max-width: 900px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(36px, 5.5vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.reader-hero h1 span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: clamp(18px, 3vw, 29px);
  font-weight: 500;
  letter-spacing: 0;
}

.reader-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 520px);
  gap: clamp(36px, 7vw, 96px);
  align-items: end;
}

.route-switch {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
  margin: 0 0 30px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: color-mix(in srgb, var(--surface-muted) 72%, var(--surface));
}

.route-switch a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border-radius: 9px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
}

.route-switch a span {
  font-family: Georgia, serif;
  font-size: 10px;
  letter-spacing: 0.08em;
}

.route-switch a:hover {
  color: var(--ink);
}

.route-switch a[aria-current="page"] {
  background: var(--surface);
  color: var(--accent-strong);
  box-shadow: 0 4px 13px rgba(47, 44, 37, 0.1);
}

.mode-english .route-switch a[aria-current="page"] {
  color: var(--warm);
}

.reader-hero__title {
  min-width: 0;
}

.reader-hero__aside {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 18px;
  padding: 16px 0 6px 28px;
  border-left: 1px solid var(--line);
}

.reader-hero__tag-group > p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.reader-hero__tag-group ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.reader-hero__tag-group li {
  padding: 6px 11px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--line));
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-soft) 72%, var(--surface));
  color: var(--accent-strong);
  font-size: 11.5px;
  line-height: 1.25;
}

.reader-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 14px;
}

.language-flow {
  display: inline-flex;
  gap: 7px;
  align-items: center;
}

.language-flow b {
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 12px;
}

.reader-layout {
  width: min(1320px, calc(100% - 36px));
  margin: 0 auto 72px;
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: clamp(28px, 4vw, 54px);
  align-items: start;
}

.toc {
  position: sticky;
  top: 92px;
  max-height: calc(100vh - 112px);
  padding: 18px 8px 18px 0;
  overflow-y: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.toc h2 {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc a {
  display: block;
  padding: 5px 0 5px 12px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
}

.toc a:hover,
.toc a[aria-current="true"] {
  border-left-color: var(--warm);
  color: var(--ink);
}

.toc__group {
  margin-top: 8px;
}

.toc__group > span {
  display: block;
  padding: 7px 0 5px 12px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
}

.toc .toc__sublist {
  margin: 0 0 4px 10px;
  padding-left: 0;
  border-left: 1px solid var(--line);
  list-style: none;
}

.toc .toc__sublist a {
  padding-top: 4px;
  padding-bottom: 4px;
  font-size: 11.5px;
}

.toc__meta {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.toc__sources {
  margin-top: 16px;
}

.toc__meta h3 {
  margin: 0 0 11px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.toc__meta .source-list {
  gap: 8px;
}

.toc__meta .source-list li {
  font-size: 11px;
  line-height: 1.55;
}

.story-board {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}

.content-panel {
  grid-column: 1 / -1;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: 0 14px 36px rgba(47, 44, 37, 0.065);
}

.panel__header {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  padding: 22px clamp(22px, 3vw, 34px) 17px;
  border-bottom: 1px solid var(--line);
}

.panel__header h2 {
  margin: 0;
  color: var(--accent-strong);
  font-family: var(--serif);
  font-size: clamp(22px, 2.8vw, 29px);
  line-height: 1.2;
}

.panel__index {
  color: var(--warm);
  font-family: Georgia, serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.panel__tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 7px;
  max-width: 66%;
  margin: 0 0 0 auto;
  padding: 0;
  list-style: none;
}

.panel__tags li {
  margin: 0;
  padding: 5px 9px;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--line));
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-soft) 62%, var(--surface));
  color: var(--accent-strong);
  font-family: var(--sans);
  font-size: 11px;
  line-height: 1.25;
}

.panel__body {
  padding: clamp(24px, 3.5vw, 38px);
}

.panel__body > :first-child {
  margin-top: 0;
}

.panel__body > :last-child {
  margin-bottom: 0;
}

.panel__body h3 {
  margin: 30px 0 12px;
  color: var(--accent-strong);
  font-size: 20px;
  line-height: 1.35;
}

.panel__body h4 {
  margin: 26px 0 9px;
  font-size: 17px;
}

.panel__body p,
.panel__body li {
  font-family: var(--serif);
  font-size: 17px;
}

.panel__body p {
  margin: 0 0 16px;
}

.panel__body ul {
  margin: 10px 0 22px;
  padding-left: 1.4em;
}

.panel__body li {
  margin: 7px 0;
  padding-left: 0.25em;
}

.panel--summary {
  grid-column: 1 / -1;
  background:
    radial-gradient(circle at 90% 10%, color-mix(in srgb, var(--accent) 15%, transparent), transparent 36%),
    var(--surface);
}

.panel--summary .panel__body p {
  font-size: 19px;
  line-height: 1.9;
}

.panel--sources {
  grid-column: span 4;
  background: color-mix(in srgb, var(--warm-soft) 45%, var(--surface));
}

.source-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.source-list li {
  margin: 0;
  padding: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.6;
}

.panel--reading {
  grid-column: span 6;
}

.panel--reading .panel__body {
  max-width: 84ch;
  margin: 0 auto;
  padding-top: clamp(32px, 5vw, 56px);
  padding-bottom: clamp(36px, 6vw, 64px);
}

.panel--chinese .panel__body p,
.panel--chinese .panel__body li {
  font-size: 18px;
  line-height: 1.95;
}

.panel--english {
  background: color-mix(in srgb, var(--surface-muted) 42%, var(--surface));
}

.panel--english .panel__header h2,
.panel--english .panel__body,
.panel--english .panel__body p,
.panel--english .panel__body li,
.panel--english .panel__body h3,
.panel--english .panel__body h4,
.panel--english .panel__body blockquote p {
  font-family: "Times New Roman", Times, serif;
}

.panel--english .panel__body p,
.panel--english .panel__body li {
  font-size: 18px;
  line-height: 1.75;
}

.panel--english-learning .panel__body,
.panel--english-learning .panel__body p,
.panel--english-learning .panel__body li,
.panel--english-learning .panel__body h3,
.panel--english-learning .panel__body h4,
.panel--english-learning .panel__body blockquote p {
  font-family: "Times New Roman", Times, serif;
}

.panel--english-learning .panel__body p,
.panel--english-learning .panel__body li {
  font-size: 18px;
  line-height: 1.75;
}

.panel--english-learning {
  grid-column: 1 / -1;
  border-top: 4px solid var(--accent);
  background:
    radial-gradient(circle at 100% 0, color-mix(in srgb, var(--accent-soft) 55%, transparent), transparent 34%),
    var(--surface);
}

.mode-english .panel--chinese,
.mode-english .panel--english {
  grid-column: span 6;
}

.panel--vocabulary {
  grid-column: 1 / -1;
  border-top: 4px solid var(--warm);
  background: color-mix(in srgb, var(--warm-soft) 42%, var(--surface));
}

.panel--vocabulary .panel__body {
  padding: 18px;
}

.panel--vocabulary .vocab-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 0;
}

.panel--vocabulary .vocab-entry {
  padding: 14px 15px;
}

.panel--vocabulary .vocab-entry--linked {
  padding-top: 42px;
}

.panel--math-learning {
  grid-column: 1 / -1;
  border-top: 4px solid var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 50%, var(--surface));
}

.panel--math-learning .panel__body p {
  max-width: 76ch;
  margin: 0;
  font-size: 18px;
  line-height: 1.8;
}

.learning-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.learning-unit {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface-muted) 72%, var(--surface));
}

.learning-unit--wide {
  grid-column: 1 / -1;
}

.learning-unit h3 {
  margin-top: 0;
}

.learning-unit > :last-child {
  margin-bottom: 0;
}

.panel--english-learning code {
  padding: 0.08em 0.28em;
  border-radius: 4px;
  background: color-mix(in srgb, var(--accent-soft) 70%, var(--surface));
  color: var(--accent-strong);
  font-family: "Times New Roman", Times, serif;
  font-size: 0.98em;
}

.vocab-list,
.synonym-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 13px;
  margin-top: 14px;
}

.vocab-entry,
.synonym-entry {
  position: relative;
  min-width: 0;
  padding: 17px 18px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface);
  scroll-margin-top: 92px;
}

.vocab-entry__badge {
  position: absolute;
  top: 11px;
  right: 11px;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--warm-soft);
  color: var(--warm);
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.04em;
}

.vocab-entry:target,
.synonym-entry:target {
  outline: 3px solid color-mix(in srgb, var(--warm) 45%, transparent);
  outline-offset: 3px;
}

.vocab-entry__word {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  align-items: baseline;
  margin-bottom: 11px;
}

.vocab-entry__word code {
  padding: 0;
  background: transparent;
  font-size: 22px;
  font-weight: 700;
}

.vocab-entry__pos {
  padding: 3px 7px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-family: var(--sans);
  font-size: 10px;
}

.vocab-entry__phonetic {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 8px;
  margin: 0 0 10px !important;
}

.vocab-entry__phonetic span,
.vocab-entry__details > span,
.synonym-entry__details > span {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.vocab-entry__phonetic b {
  font-family: "Times New Roman", Times, serif;
  font-weight: 400;
}

.vocab-entry__details,
.synonym-entry__details {
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.vocab-entry__details p,
.synonym-entry__details p {
  margin: 7px 0 0;
  font-size: 15px;
  line-height: 1.65;
}

.vocab-entry__related {
  display: inline-flex;
  margin-top: 12px;
  color: var(--warm);
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
}

.synonym-entry {
  background: color-mix(in srgb, var(--warm-soft) 55%, var(--surface));
}

.synonym-entry__terms {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: "Times New Roman", Times, serif;
  font-size: 20px;
  font-weight: 700;
}

.synonym-entry__terms i {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.synonym-entry__terms a,
.synonym-entry__terms span {
  color: var(--warm);
  text-decoration: none;
}

.synonym-entry__terms a {
  border-bottom: 1px dashed currentColor;
}

.synonym-entry__link {
  margin: 9px 0 !important;
  color: var(--accent-strong);
  font-family: var(--sans) !important;
  font-size: 11px !important;
  font-weight: 750;
}

.learning-mark {
  border-radius: 3px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.learning-mark--word {
  padding: 0.04em 0.12em;
  background: color-mix(in srgb, var(--warm-soft) 80%, transparent);
  color: inherit;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--warm);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.learning-mark--phrase {
  padding: 0.04em 0.15em;
  background: color-mix(in srgb, var(--accent-soft) 88%, transparent);
  color: inherit;
  border-bottom: 2px solid var(--accent);
}

.learning-sentence {
  margin: 22px 0 !important;
  padding: 14px 15px;
  border: 1px dashed color-mix(in srgb, var(--warm) 58%, var(--line));
  border-radius: 9px;
  background: color-mix(in srgb, var(--warm-soft) 45%, var(--surface));
}

.mode-english .panel--english,
.mode-english .panel--english * {
  font-family: "Times New Roman", Times, serif;
}

.mode-english .panel--vocabulary code,
.mode-english .panel--english-learning code,
.mode-english .synonym-entry__terms,
.mode-english [lang="en"] {
  font-family: "Times New Roman", Times, serif;
}

.answer-reveal {
  margin-top: 20px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--line));
  border-radius: 12px;
  background: var(--surface);
}

.answer-reveal summary {
  padding: 13px 16px;
  color: var(--accent-strong);
  cursor: pointer;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 800;
}

.answer-reveal__body {
  padding: 0 16px 14px;
  border-top: 1px solid var(--line);
}

.answer-reveal__body ul {
  margin-bottom: 0;
}

.panel--exercise {
  grid-column: span 5;
}

.panel--reflection {
  grid-column: span 7;
  background: color-mix(in srgb, var(--accent-soft) 38%, var(--surface));
}

.panel--knowledge {
  grid-column: span 4;
  background:
    linear-gradient(155deg, color-mix(in srgb, var(--accent-soft) 80%, var(--surface)), var(--surface));
}

.knowledge-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.knowledge-chip-list li {
  margin: 0;
  padding: 7px 11px;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--line));
  border-radius: 999px;
  background: var(--surface);
  color: var(--accent-strong);
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.3;
}

.panel--core {
  grid-column: 1 / -1;
  border-top: 4px solid var(--accent);
}

.panel--people {
  grid-column: 1 / -1;
  border-top: 4px solid var(--warm);
}

.panel--methods {
  grid-column: 1 / -1;
}

.panel--difficulty {
  grid-column: span 5;
  background: color-mix(in srgb, var(--warm-soft) 38%, var(--surface));
}

.panel--notes {
  grid-column: 1 / -1;
  background: var(--surface-muted);
}

.panel--notes .panel__body,
.panel--sources .panel__body {
  padding-top: 22px;
  padding-bottom: 24px;
}

.panel__body blockquote {
  margin: 24px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--warm);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--surface-muted);
  color: color-mix(in srgb, var(--ink) 82%, var(--muted));
}

.panel__body blockquote p {
  margin: 0;
  font-size: 16px;
}

.panel__body figure {
  margin: 28px 0;
  text-align: center;
}

.panel__body figure img {
  max-width: 100%;
  max-height: 580px;
  border-radius: var(--radius-md);
  background: #fff;
  object-fit: contain;
}

.panel__body figcaption {
  margin-top: 9px;
  color: var(--muted);
  font-size: 13px;
}

.formula {
  margin: 18px 0;
  padding: 15px 18px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-muted);
  text-align: center;
}

.formula code {
  color: var(--ink);
  font-family: "Cambria Math", "STIX Two Math", Georgia, serif;
  font-size: 20px;
  white-space: nowrap;
}

.source-link {
  overflow-wrap: anywhere;
}

.reader-footer,
.index-footer {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: 24px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 980px) {
  .story-card {
    grid-column: span 6;
  }

  .story-card:last-child {
    grid-column: 4 / span 6;
  }

  .reader-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    max-height: none;
    padding: 16px 18px;
    overflow: visible;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface);
  }

  .toc ol {
    columns: 2;
  }

  .reader-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(230px, 310px);
    gap: 32px;
  }

  .mode-english .panel--chinese,
  .mode-english .panel--english,
  .mode-english .panel--vocabulary {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .site-bar__inner,
  .index-shell,
  .reader-hero,
  .reader-layout,
  .reader-footer,
  .index-footer {
    width: min(100% - 24px, 100%);
  }

  .site-bar__inner {
    min-height: 58px;
  }

  .brand__label {
    display: none;
  }

  .index-shell {
    padding-top: 48px;
  }

  .index-hero {
    grid-template-columns: 1fr;
  }

  .edition-badge {
    display: none;
  }

  .story-card,
  .story-card:last-child {
    grid-column: 1 / -1;
  }

  .reader-hero {
    padding-top: 38px;
  }

  .reader-hero__grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .reader-hero__aside {
    padding: 18px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .reader-layout {
    gap: 18px;
  }

  .toc ol {
    columns: 1;
  }

  .toc .toc__sublist {
    columns: 1;
  }

  .story-board {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .content-panel,
  .panel--summary,
  .panel--sources,
  .panel--exercise,
  .panel--reflection,
  .panel--knowledge,
  .panel--core,
  .panel--methods,
  .panel--difficulty {
    grid-column: 1;
    border-radius: 16px;
  }

  .learning-grid {
    grid-template-columns: 1fr;
  }

  .learning-unit--wide {
    grid-column: 1;
  }

  .vocab-list,
  .synonym-list {
    grid-template-columns: 1fr;
  }

  .route-switch {
    display: grid;
    width: 100%;
  }

  .panel__header {
    padding: 19px 20px 14px;
  }

  .panel__tags {
    justify-content: flex-start;
    max-width: 100%;
    margin-left: 0;
  }

  .panel__body {
    padding: 23px 20px 28px;
  }

  .panel__body p,
  .panel__body li,
  .panel--chinese .panel__body p,
  .panel--chinese .panel__body li,
  .panel--english .panel__body p,
  .panel--english .panel__body li {
    font-size: 16px;
  }

  .text-button {
    display: none;
  }
}

@media print {
  :root {
    --paper: #fff;
    --surface: #fff;
    --ink: #000;
    --muted: #444;
    --line: #bbb;
  }

  .site-bar,
  .toc,
  .reading-progress,
  .reader-hero__crumb,
  .reader-footer {
    display: none !important;
  }

  .reader-hero,
  .reader-layout {
    width: 100%;
    margin: 0;
    padding: 0;
  }

  .reader-hero {
    margin-bottom: 24px;
  }

  .reader-layout {
    display: block;
  }

  .story-board {
    display: block;
  }

  .content-panel {
    margin-bottom: 18px;
    border-radius: 0;
    border: 0;
    box-shadow: none;
  }

  .panel__header {
    break-after: avoid;
  }

  .panel__body figure,
  .formula,
  blockquote {
    break-inside: avoid;
  }

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