/* =====================================================================
   一程 · Shared design system
   Editorial Quietism. Single serif family. 4-color palette.
   ===================================================================== */

@font-face {
  font-family: "LXGW WenKai Mono GB";
  src: local("LXGW WenKai Mono GB"),
       local("LXGWWenKaiMonoGB-Regular"),
       local("霞鹜文楷等宽 GB"),
       local("霞鹜文楷等宽GB");
  font-weight: 200 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "LXGW WenKai Mono GB";
  src: local("LXGW WenKai Mono GB Medium"),
       local("LXGWWenKaiMonoGB-Medium"),
       local("霞鹜文楷等宽 GB Medium"),
       local("霞鹜文楷等宽GB Medium"),
       local("霞鹜文楷等宽 GB"),
       local("霞鹜文楷等宽GB");
  font-weight: 500 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper:        #FAF8F3;
  --ink:          #1A1614;
  --muted-ink:    #6B6660;
  --vermilion:    #A23F3F;
  --hairline:     #E8E2D5;
  --panel:        rgba(255, 255, 255, 0.96);
  --panel-soft:   rgba(255, 255, 255, 0.32);
  --shadow-soft:  rgba(26, 22, 20, 0.08);
  --glow:         rgba(162, 63, 63, 0.18);

  --study-cn-font: "LXGW WenKai Mono GB", "霞鹜文楷等宽 GB", "霞鹜文楷等宽GB", "霞骛文楷等宽 GB", "霞骛文楷等宽GB", "LXGW WenKai Mono", "Microsoft YaHei UI", monospace;
  --serif-cn: var(--study-cn-font);
  --serif-en: "LXGW WenKai Mono GB", "霞鹜文楷等宽 GB", "霞鹜文楷等宽GB", "霞骛文楷等宽 GB", "霞骛文楷等宽GB", monospace;

  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
  color-scheme: light;
}

html[data-theme="night"] {
  --paper:        #11100E;
  --ink:          #F2E8D2;
  --muted-ink:    #B7A98E;
  --vermilion:    #D18A70;
  --hairline:     #3A3027;
  --panel:        rgba(28, 24, 20, 0.96);
  --panel-soft:   rgba(255, 232, 186, 0.07);
  --shadow-soft:  rgba(0, 0, 0, 0.38);
  --glow:         rgba(224, 160, 107, 0.22);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--study-cn-font);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.04em;
  text-wrap: pretty;
  transition: background-color 520ms var(--ease), color 520ms var(--ease);
}

button,
input,
textarea,
select,
.site-header,
.brand,
.brand-section,
.nav,
.nav-menu,
.page-hero,
.page-hero h1,
.page-hero .lede,
.article-index,
.article-card,
.article-card h2,
.article-card .subtitle,
.article-card .summary,
.article-card .read,
.base-card-section,
.base-category-nav,
.base-category-section,
.base-title-card,
.base-card,
.foundation-card,
.woven-thread,
.encounter-body,
.encounter-toc,
.about-focus-section,
.name-intro,
.name-bridge,
.doing,
.duo,
.day-night-note,
.path-intro,
.path-node,
.path-meaning,
.nots-intro,
.nots,
.nots-closing,
.final-statement,
.about-prose,
.day-night-grid {
  font-family: var(--study-cn-font);
}

html[data-theme="night"] body {
  background:
    radial-gradient(circle at 50% 0%, rgba(209, 138, 112, 0.12), transparent 34rem),
    radial-gradient(circle at 12% 18%, rgba(242, 232, 210, 0.045), transparent 22rem),
    var(--paper);
}

p { margin: 0 0 1.25em; }
p:last-child { margin-bottom: 0; }

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-bottom-color 240ms var(--ease);
}
a:hover { border-bottom-color: var(--vermilion); }

::selection { background: var(--vermilion); color: var(--paper); }
html[data-theme="night"] ::selection { color: #11100E; }

img { max-width: 100%; display: block; }

/* ==================== Layout primitives ==================== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 48px; }
.narrow    { max-width: 720px;  margin-left: auto; margin-right: auto; }
.medium    { max-width: 880px;  margin-left: auto; margin-right: auto; }

section { padding: 160px 0; position: relative; }

/* ==================== Site header (fixed) ==================== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 28px 48px;
  display: flex; justify-content: space-between; align-items: center;
  pointer-events: none;
  mix-blend-mode: multiply;
}
html[data-theme="night"] .site-header { mix-blend-mode: normal; }
.site-header > * { pointer-events: auto; }

.study-reader-page .site-header {
  z-index: 260;
  mix-blend-mode: normal;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--paper) 92%, transparent) 0%, color-mix(in srgb, var(--paper) 78%, transparent) 72%, transparent 100%);
  border-bottom: 1px solid color-mix(in srgb, var(--hairline) 72%, transparent);
  backdrop-filter: blur(14px);
}

.external-digest-reader-page .site-header {
  transform: translateY(0);
  opacity: 1;
  transition:
    transform 320ms cubic-bezier(0.22, 0.8, 0.24, 1),
    opacity 220ms ease,
    filter 260ms ease;
  will-change: transform, opacity, filter;
}

.external-digest-reader-page.is-study-header-hidden .site-header {
  transform: translateY(calc(-100% - 18px));
  opacity: 0;
  filter: blur(4px);
  pointer-events: none;
}

.brand {
  font-family: var(--study-cn-font);
  font-weight: 300;
  font-size: 18px;
  letter-spacing: 0.5em;
  padding-left: 0.5em;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 14px;
}
.brand a { border: none; }

.brand-section {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.24em;
  padding-left: 0;
  color: var(--vermilion);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
  pointer-events: none;
}

.brand-section::before {
  content: "/";
  display: block;
  width: auto;
  height: auto;
  background: none;
  color: var(--muted-ink);
  letter-spacing: 0;
}

.site-header.is-section-aware .brand-section {
  opacity: 1;
  transform: translateX(0);
}

[data-scroll-fade] {
  opacity: var(--scroll-title-opacity, 1);
  transform: translateY(var(--scroll-title-y, 0px));
  filter: blur(var(--scroll-title-blur, 0px));
  transition: opacity 120ms linear, transform 120ms linear, filter 120ms linear;
}

.nav {
  display: flex; gap: 28px;
  font-size: 13px;
  color: var(--muted-ink);
  letter-spacing: 0.15em;
  align-items: center;
}

.theme-toggle {
  width: 28px;
  height: 28px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  color: var(--muted-ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  transition: color 260ms var(--ease), border-color 260ms var(--ease), background 260ms var(--ease), box-shadow 260ms var(--ease), transform 260ms var(--ease);
}

.theme-toggle:hover {
  color: var(--vermilion);
  border-color: var(--vermilion);
  transform: translateY(-1px);
}

.theme-toggle svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

html[data-theme="night"] .theme-toggle {
  background: rgba(242, 232, 210, 0.055);
  box-shadow: 0 0 24px var(--glow), inset 0 0 16px rgba(242, 232, 210, 0.025);
}

html[data-theme="night"] input,
html[data-theme="night"] textarea,
html[data-theme="night"] select {
  color: var(--ink) !important;
  border-color: var(--hairline) !important;
  caret-color: var(--vermilion);
}

html[data-theme="night"] input::placeholder,
html[data-theme="night"] textarea::placeholder {
  color: rgba(183, 169, 142, 0.64) !important;
}

html[data-theme="night"] .field,
html[data-theme="night"] .contact-form,
html[data-theme="night"] .letter-panel {
  border-color: var(--hairline) !important;
}

html[data-theme="night"] .meta-section {
  background: linear-gradient(to bottom, transparent, rgba(58, 48, 39, 0.32) 30%, rgba(58, 48, 39, 0.32) 70%, transparent) !important;
}

.nav-dropdown {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.nav-trigger {
  position: relative;
  color: inherit;
  cursor: default;
}

.nav-trigger::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0.15em;
  bottom: -4px;
  height: 1px;
  background: var(--vermilion);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 240ms var(--ease);
}

.nav-dropdown:hover .nav-trigger::after,
.nav-dropdown:focus-within .nav-trigger::after {
  transform: scaleX(1);
}

.nav-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: max-content;
  min-width: 0;
  padding: 9px 10px;
  border: 1px solid var(--hairline);
  background: var(--panel);
  box-shadow: 0 16px 36px var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 7px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 240ms var(--ease), transform 240ms var(--ease), visibility 240ms var(--ease);
}

.nav-dropdown:hover .nav-menu,
.nav-dropdown:focus-within .nav-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-menu a {
  display: block;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  padding: 1px 0;
  color: var(--muted-ink);
}

.nav-menu a:hover {
  border-bottom-color: var(--vermilion);
}

/* ==================== Section label (numbered) ==================== */
.section-label {
  font-family: var(--serif-en);
  font-weight: 300;
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--muted-ink);
  margin-bottom: 80px;
  display: flex; align-items: center; gap: 16px;
}
.section-label::before {
  content: ""; width: 32px; height: 1px;
  background: var(--muted-ink); display: block;
}
.section-label .num {
  font-size: 15px; letter-spacing: 0.25em;
}

/* ==================== Page hero (inner pages) ==================== */
.page-hero {
  min-height: 70vh;
  padding: 200px 0 120px;
  display: flex; flex-direction: column; justify-content: center;
}
.page-hero .container {
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
}
.page-hero .crumb {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.4em;
  color: var(--muted-ink);
  margin-bottom: 40px;
}
.page-hero .crumb .sep { margin: 0 12px; opacity: 0.5; }
.page-hero h1 {
  font-family: var(--study-cn-font);
  font-weight: 200;
  font-size: clamp(56px, 8vw, 112px);
  line-height: 1.15;
  letter-spacing: 0.2em;
  margin: 0 0 56px;
  padding-left: 0.2em;
  color: var(--ink);
}
.page-hero .lede {
  max-width: 600px;
  margin: 0 auto;
  font-size: 18px;
  line-height: 2;
  color: var(--muted-ink);
  letter-spacing: 0.06em;
}

/* ==================== Pull quote (vermilion bar) ==================== */
.pull-quote {
  margin: 96px auto;
  max-width: 720px;
  padding-left: 32px;
  border-left: 1px solid var(--vermilion);
}
.pull-quote p {
  font-family: var(--study-cn-font);
  font-size: 21px;
  font-weight: 300;
  line-height: 1.9;
  letter-spacing: 0.05em;
  color: var(--ink);
  margin: 0;
}
.pull-quote p + p { margin-top: 16px; }

.gist .slogan {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 300;
  font-size: 22px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--vermilion);
  margin-bottom: 1.4em;
}

/* ==================== Article directory ==================== */
.article-index {
  padding: 80px 0 140px;
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 960px;
  border-top: 1px solid var(--hairline);
}

.article-card {
  display: grid;
  grid-template-columns: 120px 1fr 120px;
  gap: 48px;
  padding: 44px 0;
  border-bottom: 1px solid var(--hairline);
  align-items: start;
}

.article-card .article-no {
  font-family: var(--serif-en);
  font-weight: 300;
  font-size: 32px;
  line-height: 1;
  color: var(--vermilion);
}

.article-card h2 {
  font-family: var(--study-cn-font);
  font-weight: 300;
  font-size: 28px;
  line-height: 1.4;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
  color: var(--ink);
}

.article-card .subtitle {
  font-size: 16px;
  color: var(--muted-ink);
  margin: 0 0 18px;
}

.article-card .summary {
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted-ink);
  margin: 0 0 18px;
}

.article-card .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted-ink);
}

.article-card .read {
  font-size: 14px;
  color: var(--vermilion);
  letter-spacing: 0.1em;
  justify-self: end;
  white-space: nowrap;
}

.article-card:hover .read {
  transform: translateX(4px);
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 18px;
  margin-top: 72px;
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--muted-ink);
}

.pagination a,
.pagination span {
  min-width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--hairline);
}

/* ==================== Longform encounter article ==================== */
.encounter-article {
  padding: 72px 0 150px;
}

.encounter-page .page-hero {
  min-height: 64vh;
  padding-bottom: 92px;
}

.encounter-page .page-hero h1 {
  max-width: 980px;
  font-size: clamp(38px, 6.4vw, 84px);
  letter-spacing: 0.13em;
  padding-left: 0.13em;
  margin-bottom: 38px;
}

.encounter-page .page-hero .lede {
  color: color-mix(in srgb, var(--muted-ink) 82%, var(--ink));
}

.encounter-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) 240px;
  gap: 84px;
  align-items: start;
  max-width: 1120px;
  margin: 0 auto;
}

.encounter-body {
  font-size: 19px;
  line-height: 1.86;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.encounter-kicker {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.28em;
  color: var(--vermilion);
  margin-bottom: 28px;
}

.encounter-body h2 {
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.45;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin: 96px 0 28px;
}

.encounter-body h2:first-of-type {
  margin-top: 0;
}

.encounter-body p {
  margin: 0 0 1.28em;
}

.encounter-body strong {
  color: color-mix(in srgb, var(--vermilion) 70%, var(--ink));
  font-weight: 700;
}

.encounter-body .quiet-line {
  margin: 56px 0;
  padding: 30px 34px;
  border-left: 1px solid var(--vermilion);
  background: linear-gradient(90deg, color-mix(in srgb, var(--vermilion) 7%, transparent), transparent);
  font-family: var(--serif-cn);
  font-size: 20px;
  line-height: 1.9;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.encounter-note {
  margin-top: 88px;
  padding-top: 28px;
  border-top: 1px solid var(--hairline);
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--muted-ink);
}

.encounter-toc {
  position: sticky;
  top: 120px;
  padding: 28px 0 28px 28px;
  border-left: 1px solid var(--hairline);
}

.encounter-toc .toc-title {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--vermilion);
  margin-bottom: 24px;
}

.encounter-toc a {
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid transparent;
  font-size: 14px;
  line-height: 1.65;
  letter-spacing: 0.12em;
  color: var(--muted-ink);
}

.encounter-toc a:hover {
  color: var(--ink);
  border-bottom-color: var(--hairline);
}

html[data-theme="night"] .encounter-body {
  color: color-mix(in srgb, var(--ink) 92%, var(--muted-ink));
}

html[data-theme="night"] .encounter-body strong {
  color: #E0B17D;
  padding: 0;
  background: none;
}

html[data-theme="night"] .encounter-body .quiet-line {
  background:
    linear-gradient(90deg, rgba(209, 138, 112, 0.13), rgba(242, 232, 210, 0.025) 54%, transparent);
  box-shadow: 0 0 34px rgba(209, 138, 112, 0.06);
}

html[data-theme="night"] .encounter-toc {
  background: linear-gradient(180deg, rgba(242, 232, 210, 0.025), transparent);
}

.pagination .current {
  color: var(--vermilion);
  border-color: var(--vermilion);
}

.read-preview {
  max-width: 760px;
  margin: 120px auto 0;
  padding-top: 48px;
  border-top: 1px solid var(--hairline);
}

.read-preview h2 {
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 32px;
  letter-spacing: 0.08em;
  margin: 0 0 20px;
}

.read-preview p {
  font-size: 17px;
  line-height: 2;
  color: var(--muted-ink);
}

/* ==================== Column map / categorized directory ==================== */
.column-map {
  padding: 120px 0;
}

.column-map .map-intro {
  max-width: 680px;
  margin: 0 auto 88px;
  text-align: center;
  font-size: 16px;
  line-height: 1.95;
  color: var(--muted-ink);
}

.column-groups {
  max-width: 1040px;
  margin: 0 auto;
  border-top: 1px solid var(--hairline);
}

.column-group {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 56px;
  padding: 56px 0;
  border-bottom: 1px solid var(--hairline);
}

.column-group .group-name {
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 28px;
  line-height: 1.45;
  letter-spacing: 0.1em;
  color: var(--ink);
  margin: 0 0 16px;
}

.column-group .group-note {
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted-ink);
  margin: 0;
}

.line-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.line-block {
  border-left: 1px solid var(--hairline);
  padding-left: 24px;
}

.line-block .line-name {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--vermilion);
  margin-bottom: 16px;
}

.line-block p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted-ink);
  margin: 0 0 18px;
}

.line-block ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.line-block li {
  position: relative;
  padding-left: 18px;
  margin: 10px 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.line-block li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 6px;
  height: 1px;
  background: var(--vermilion);
}

/* ==================== Guoxue subcolumn pages ==================== */
.sutra-intro {
  max-width: 760px;
  margin: -40px auto 0;
  padding-left: 32px;
  border-left: 1px solid var(--vermilion);
}

.sutra-intro p {
  font-size: 18px;
  line-height: 2;
  color: var(--muted-ink);
}

.sutra-directory {
  padding: 90px 0 150px;
}

.thread-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 72px;
  align-items: start;
  max-width: 1120px;
  margin: 0 auto;
}

.thread-heading {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.32em;
  color: var(--vermilion);
  margin-bottom: 36px;
}

.chapter-overview {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 54px;
  max-width: 1120px;
  margin: 0 auto 54px;
  padding: 44px 0 46px;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.chapter-overview h2 {
  margin: 0 0 18px;
  color: var(--ink);
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 30px;
  letter-spacing: 0.12em;
}

.chapter-overview p {
  max-width: 820px;
  margin: 0;
  color: var(--muted-ink);
  font-size: 15px;
  line-height: 1.95;
}

.thread-primary .article-list {
  margin: 0;
  max-width: none;
}

.thread-primary .article-card {
  grid-template-columns: 88px 1fr 88px;
  gap: 32px;
  padding: 46px 0;
}

.foundation-panel {
  position: sticky;
  top: 120px;
  padding: 36px 28px;
  border: 1px solid var(--hairline);
  background: var(--panel-soft);
  box-shadow: 0 18px 48px var(--shadow-soft);
}

.foundation-panel .foundation-title {
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 24px;
  letter-spacing: 0.12em;
  color: var(--ink);
  margin: 0 0 16px;
}

.foundation-panel .foundation-desc {
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted-ink);
  margin: 0 0 28px;
}

.foundation-action {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--vermilion);
  border-bottom-color: rgba(162, 63, 63, 0.35);
  padding-bottom: 6px;
}

.war-directory {
  padding: 72px 0 140px;
}

.war-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
}

.war-card {
  position: relative;
  min-height: 430px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  padding: 26px;
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, rgba(0, 0, 0, 0.18));
  background: #2c2721;
  color: #f6eddd;
  box-shadow: 0 24px 60px rgba(31, 25, 18, 0.22);
  isolation: isolate;
  transition: transform 320ms var(--ease), box-shadow 320ms var(--ease), border-color 320ms var(--ease);
}

.war-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: var(--war-bg);
  background-size: cover;
  background-position: center;
  filter: grayscale(0.48) sepia(0.2) contrast(1.04);
  transform: scale(1.04);
  transition: transform 620ms var(--ease), filter 620ms var(--ease);
}

.war-card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(26, 22, 18, 0.08) 0%, rgba(26, 22, 18, 0.36) 42%, rgba(24, 20, 16, 0.92) 100%),
    linear-gradient(90deg, rgba(92, 39, 33, 0.48), rgba(22, 34, 42, 0.18));
}

.war-card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--vermilion) 48%, var(--hairline));
  box-shadow: 0 34px 82px rgba(31, 25, 18, 0.3);
}

.war-card:hover::before {
  transform: scale(1.1);
  filter: grayscale(0.26) sepia(0.18) contrast(1.08);
}

.war-era {
  font-family: var(--serif-en);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: #e4c789;
  margin-bottom: 16px;
}

.war-card h2 {
  margin: 0 0 12px;
  font-family: var(--serif-cn);
  font-size: 34px;
  font-weight: 300;
  letter-spacing: 0.18em;
  color: #fff7e8;
}

.war-card p {
  margin: 0 0 26px;
  max-width: 13em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 248, 235, 0.78);
}

.war-go {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: #f0d7a3;
}

.war-hero {
  position: relative;
  overflow: hidden;
  color: #f8eedf;
  isolation: isolate;
}

.war-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: var(--hero-bg);
  background-size: cover;
  background-position: center;
  filter: grayscale(0.42) sepia(0.16) contrast(1.04);
}

.war-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(21, 18, 15, 0.46), rgba(21, 18, 15, 0.82)),
    linear-gradient(90deg, rgba(84, 37, 34, 0.54), rgba(24, 40, 48, 0.3));
}

.war-hero .crumb,
.war-hero .lede {
  color: rgba(255, 246, 229, 0.82);
}

.war-hero h1 {
  color: #fff8ea;
}

.korea-workbench .thread-shell {
  grid-template-columns: minmax(0, 1fr) 340px;
}

.korea-primary {
  display: grid;
  gap: 28px;
}

.korea-mainline {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr) 110px;
  gap: 28px;
  align-items: start;
  padding: 34px 0 40px;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.korea-mainline:hover h2,
.korea-topic:hover h3 {
  color: var(--vermilion);
}

.korea-label {
  font-family: var(--serif-en);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--vermilion);
}

.korea-mainline h2 {
  margin: 0 0 12px;
  font-family: var(--serif-cn);
  font-size: 34px;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--ink);
  transition: color 260ms var(--ease);
}

.korea-mainline .subtitle {
  margin: 0 0 14px;
  font-size: 15px;
  color: var(--vermilion);
  letter-spacing: 0.08em;
}

.korea-mainline p:not(.subtitle) {
  margin: 0;
  max-width: 620px;
  font-size: 15px;
  line-height: 2;
  color: var(--muted-ink);
}

.korea-action {
  justify-self: end;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--muted-ink);
}

.korea-section-title {
  margin-top: 18px;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.32em;
  color: var(--vermilion);
}

.korea-topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.korea-topic-grid-single {
  grid-template-columns: minmax(0, 1fr);
}

.korea-topic-feature {
  min-height: 180px;
}

.korea-topic-shell {
  display: grid;
  gap: 28px;
  max-width: 980px;
  margin: 0 auto;
}

.korea-topic {
  min-height: 230px;
  padding: 24px 22px;
  border: 1px solid var(--hairline);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--panel-soft) 88%, transparent), transparent),
    var(--panel);
  box-shadow: 0 14px 38px var(--shadow-soft);
  transition: transform 280ms var(--ease), border-color 280ms var(--ease), box-shadow 280ms var(--ease);
}

.korea-topic:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--vermilion) 38%, var(--hairline));
  box-shadow: 0 22px 52px var(--shadow-soft);
}

.korea-topic span {
  display: block;
  margin-bottom: 28px;
  font-family: var(--serif-en);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--vermilion);
}

.korea-topic h3 {
  margin: 0 0 14px;
  font-family: var(--serif-cn);
  font-size: 22px;
  font-weight: 300;
  line-height: 1.45;
  letter-spacing: 0.05em;
  color: var(--ink);
  transition: color 260ms var(--ease);
}

.korea-topic p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted-ink);
}

.korea-topic.korea-topic-link {
  min-height: 0;
  padding: 26px 0 30px;
  border-width: 1px 0;
  background: transparent;
  box-shadow: none;
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr) minmax(160px, 0.36fr);
  gap: 28px;
  align-items: start;
}

.korea-topic.korea-topic-link:hover {
  transform: translateX(6px);
  box-shadow: none;
  border-color: color-mix(in srgb, var(--vermilion) 36%, var(--hairline));
}

.korea-topic.korea-topic-link span,
.korea-topic.korea-topic-link h3,
.korea-topic.korea-topic-link p {
  margin: 0;
}

.mainline-map {
  padding: 86px 0 150px;
}

.mainline-intro {
  max-width: 780px;
  margin: 0 auto 70px;
  padding-left: 30px;
  border-left: 1px solid var(--vermilion);
}

.mainline-intro p,
.base-card-intro p {
  color: var(--muted-ink);
  font-size: 16px;
  line-height: 2;
}

.chapter-list {
  max-width: 1320px;
  margin: 0 auto;
  border-top: 1px solid var(--hairline);
}

.chapter-block {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 54px;
  padding: 48px 0;
  border-bottom: 1px solid var(--hairline);
}

.chapter-meta {
  display: grid;
  align-content: start;
  gap: 12px;
  color: var(--muted-ink);
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.16em;
}

.chapter-meta span {
  color: var(--vermilion);
  font-family: var(--serif-cn);
  font-style: normal;
  font-size: 16px;
  letter-spacing: 0.16em;
}

.chapter-block h2 {
  margin: 0 0 14px;
  color: var(--ink);
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 30px;
  letter-spacing: 0.12em;
}

.chapter-block p {
  max-width: 900px;
  margin: 0 0 24px;
  color: var(--muted-ink);
  font-size: 15px;
  line-height: 1.95;
}

.chapter-block ol {
  margin: 0;
  padding-left: 1.4em;
  columns: 2;
  column-gap: 42px;
}

.chapter-block li {
  break-inside: avoid;
  margin: 0 0 12px;
  padding-left: 0.2em;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.75;
}

.chapter-block a:hover {
  color: var(--vermilion);
}

.chapter-read {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  color: var(--vermilion);
  font-size: 14px;
  letter-spacing: 0.12em;
  border-bottom-color: color-mix(in srgb, var(--vermilion) 42%, transparent);
}

.chapter-articles {
  max-width: none;
  margin-top: 34px;
}

.chapter-articles .article-card {
  grid-template-columns: 120px minmax(0, 1fr) 120px;
  gap: 48px;
  padding: 44px 0;
}

.chapter-articles .article-card .article-no {
  font-size: 32px;
}

.chapter-articles .article-card h2 {
  margin: 0 0 10px;
  font-size: 28px;
  letter-spacing: 0.08em;
}

.chapter-articles .article-card .summary {
  margin-bottom: 18px;
}

.chapter-articles .article-card .meta {
  gap: 16px;
}

.mainline-reserved {
  max-width: 760px;
  margin: 70px auto 0;
  padding-top: 28px;
  border-top: 1px solid var(--hairline);
  color: var(--muted-ink);
  font-size: 15px;
  line-height: 1.95;
}

.mainline-reserved a,
.article-links a {
  color: var(--vermilion);
  border-bottom-color: color-mix(in srgb, var(--vermilion) 42%, transparent);
}

.wiki-link,
.wiki-sample {
  display: inline;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  letter-spacing: inherit;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.wiki-link:hover {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
  background: transparent;
}

.war-map-placeholder .wiki-link {
  display: inline-block;
  border-bottom-color: color-mix(in srgb, var(--vermilion) 42%, var(--hairline));
}

.war-map-placeholder {
  margin: 54px 0;
  min-height: 280px;
  display: grid;
  place-items: center;
  border: 1px solid var(--hairline);
  background:
    linear-gradient(90deg, transparent 49.6%, color-mix(in srgb, var(--vermilion) 32%, transparent) 49.6%, color-mix(in srgb, var(--vermilion) 32%, transparent) 50.4%, transparent 50.4%),
    linear-gradient(0deg, transparent 49.6%, color-mix(in srgb, var(--hairline) 88%, transparent) 49.6%, color-mix(in srgb, var(--hairline) 88%, transparent) 50.4%, transparent 50.4%),
    color-mix(in srgb, var(--paper) 90%, var(--vermilion));
}

.war-map-placeholder div {
  max-width: 520px;
  padding: 28px;
  text-align: center;
}

.war-map-placeholder span {
  display: block;
  margin-bottom: 12px;
  color: var(--vermilion);
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.18em;
}

.war-map-placeholder strong {
  display: block;
  margin-bottom: 12px;
  color: var(--ink);
  font-weight: 400;
  font-size: 22px;
  letter-spacing: 0.1em;
}

.war-map-placeholder p {
  color: var(--muted-ink);
  font-size: 14px;
  line-height: 1.85;
}

.war-note-table {
  width: 100%;
  margin: 26px 0 42px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.85;
}

.war-note-table th,
.war-note-table td {
  padding: 14px 16px;
  border: 1px solid var(--hairline);
  text-align: left;
  vertical-align: top;
}

.war-note-table th {
  color: var(--ink);
  background: color-mix(in srgb, var(--vermilion) 8%, var(--paper));
  font-weight: 400;
}

.article-links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-top: 62px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  font-size: 14px;
  letter-spacing: 0.1em;
}

.base-card-section {
  padding: 82px 0 150px;
}

.base-card-intro {
  max-width: 760px;
  margin: 0 auto 54px;
  padding-left: 28px;
  border-left: 1px solid var(--vermilion);
}

.base-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  max-width: 1120px;
  margin: 0 auto;
}

.base-category-nav {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  max-width: 980px;
  margin: 0 auto 74px;
}

.base-category-nav a {
  min-height: 72px;
  display: grid;
  place-items: center;
  border: 1px solid var(--hairline);
  color: var(--ink);
  font-size: 18px;
  letter-spacing: 0.16em;
  background: var(--panel-soft);
  transition: color 260ms var(--ease), border-color 260ms var(--ease), transform 260ms var(--ease);
}

.base-category-nav a:hover {
  color: var(--vermilion);
  border-color: var(--vermilion);
  transform: translateY(-2px);
}

.base-category-section {
  max-width: 1040px;
  margin: 0 auto 76px;
  scroll-margin-top: 110px;
}

.base-category-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--hairline);
}

.base-category-head span {
  color: var(--vermilion);
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.24em;
}

.base-category-head h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 30px;
  letter-spacing: 0.14em;
}

.base-title-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.base-title-card {
  min-height: 92px;
  display: flex;
  align-items: center;
  padding: 22px 24px;
  border: 1px solid var(--hairline);
  background: var(--panel-soft);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: 0.06em;
  scroll-margin-top: 118px;
  transition: color 260ms var(--ease), border-color 260ms var(--ease), background 260ms var(--ease), transform 260ms var(--ease);
}

.base-title-card:hover,
.base-title-card:target {
  color: var(--vermilion);
  border-color: var(--vermilion);
  background: color-mix(in srgb, var(--vermilion) 6%, transparent);
  transform: translateY(-2px);
}

.base-card {
  padding: 26px 24px 28px;
  border: 1px solid var(--hairline);
  background: var(--panel-soft);
  box-shadow: 0 16px 42px var(--shadow-soft);
}

.base-type {
  display: block;
  margin-bottom: 20px;
  color: var(--vermilion);
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.2em;
}

.base-card h2 {
  margin: 0 0 14px;
  color: var(--ink);
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 22px;
  line-height: 1.45;
  letter-spacing: 0.06em;
}

.base-card p {
  margin: 0 0 20px;
  color: var(--muted-ink);
  font-size: 14px;
  line-height: 1.9;
}

.base-card dl {
  margin: 0;
  display: grid;
  gap: 10px;
}

.base-card dt {
  color: var(--vermilion);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.base-card dd {
  margin: -8px 0 0;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.75;
}

.foundation-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 16px;
}

.foundation-card {
  display: block;
  padding: 18px 0 18px 18px;
  border-left: 1px solid rgba(162, 63, 63, 0.35);
  border-bottom: 1px solid var(--hairline);
  transition: padding-left 320ms var(--ease), border-left-color 320ms var(--ease);
}

.foundation-card:hover {
  padding-left: 24px;
  border-left-color: var(--vermilion);
}

.foundation-card .foundation-no {
  display: block;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--vermilion);
  margin-bottom: 8px;
}

.foundation-card h3 {
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin: 0 0 8px;
}

.foundation-card p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted-ink);
  margin: 0;
}

.subpath-back {
  display: flex;
  justify-content: center;
  margin-top: 84px;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.28em;
  color: var(--muted-ink);
}

.woven-thread {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 960px;
  border-top: 1px solid var(--hairline);
}

.woven-thread > li {
  border-bottom: 1px solid var(--hairline);
}

.woven-base {
  padding: 0 0 34px 120px;
  margin-top: -16px;
}

.woven-base a {
  display: grid;
  grid-template-columns: 90px 1fr 88px;
  gap: 28px;
  align-items: start;
  padding: 22px 0 0 24px;
  border-left: 1px solid rgba(162, 63, 63, 0.34);
  color: var(--muted-ink);
  transition: padding-left 320ms var(--ease), border-left-color 320ms var(--ease);
}

.woven-base a:hover {
  padding-left: 32px;
  border-left-color: var(--vermilion);
}

.woven-base .base-no {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--vermilion);
}

.woven-base h3 {
  font-family: var(--serif-cn);
  font-weight: 300;
  font-size: 19px;
  line-height: 1.55;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin: 0 0 8px;
}

.woven-base p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-ink);
  margin: 0 0 12px;
}

.woven-base .base-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted-ink);
}

.woven-base .base-read {
  justify-self: end;
  font-size: 13px;
  color: var(--vermilion);
  letter-spacing: 0.12em;
  white-space: nowrap;
}

/* ==================== Signature (seal + date) ==================== */
.signature {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.signature img { width: 80px; height: 80px; display: block; }
.signature .date {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--muted-ink);
}

/* ==================== Footer ==================== */
footer {
  padding: 60px 0;
  border-top: 1px solid var(--hairline);
  font-size: 13px;
  color: var(--muted-ink);
  letter-spacing: 0.15em;
}
footer .colophon {
  font-family: var(--serif-en);
  font-style: italic;
}
footer nav { display: flex; gap: 32px; }
footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

/* ==================== Reveal motion ==================== */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* ==================== Section title moods ==================== */
.title-effect {
  position: relative;
  display: inline-grid;
  place-items: center;
  isolation: isolate;
  perspective: 1000px;
  white-space: nowrap;
  margin-left: -0.08em;
  padding-left: 0 !important;
}

.title-effect.is-title-ready {
  color: transparent;
  letter-spacing: 0;
}

.title-effect-text {
  grid-area: 1 / 1;
  position: relative;
  z-index: 2;
  color: var(--ink);
  display: inline-block;
  line-height: inherit;
}

.title-effect-char {
  position: relative;
  display: inline-block;
  color: var(--ink);
  line-height: inherit;
}

.title-effect-char:not(:last-child) {
  margin-right: 0.25em;
}

.title-cloud {
  position: absolute;
  z-index: 4;
  left: var(--x);
  top: var(--y);
  width: var(--w);
  height: var(--h);
  border-radius: 47% 53% 61% 39% / 56% 41% 59% 44%;
  background:
    radial-gradient(circle at 28% 42%, rgba(255, 255, 255, 0.72), transparent 48%),
    radial-gradient(circle at 72% 54%, color-mix(in srgb, var(--paper) 82%, transparent), transparent 52%),
    color-mix(in srgb, var(--paper) 70%, transparent);
  box-shadow: 0 0 34px color-mix(in srgb, var(--paper) 60%, transparent);
  filter: blur(10px);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(1.08);
}

html[data-theme="night"] .title-cloud {
  background:
    radial-gradient(circle at 28% 42%, rgba(246, 236, 216, 0.14), transparent 48%),
    radial-gradient(circle at 72% 54%, rgba(180, 154, 124, 0.12), transparent 52%),
    rgba(55, 50, 44, 0.55);
  box-shadow: 0 0 42px rgba(245, 224, 188, 0.12);
}

.title-effect[data-title-effect="guoxue"].in .title-effect-text {
  animation: guoxueTextReveal 2600ms ease both;
}

.title-effect[data-title-effect="guoxue"].in .title-cloud {
  animation: guoxueCloudDrift var(--dur, 3200ms) cubic-bezier(.18,.72,.18,1) both;
  animation-delay: var(--delay, 0ms);
}

.title-effect[data-title-effect="lishi"] {
  perspective: none;
  padding-bottom: 0.48em !important;
}

.title-effect[data-title-effect="lishi"]::before {
  content: "";
  position: absolute;
  left: 7%;
  right: 7%;
  top: calc(100% - 0.36em);
  height: 1px;
  z-index: 1;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--vermilion) 42%, transparent), transparent);
  opacity: 0;
  filter: blur(0.2px);
  transform: scaleX(0.46);
  transform-origin: center;
  pointer-events: none;
}

.title-effect[data-title-effect="lishi"]::after {
  content: attr(aria-label);
  position: absolute;
  left: 50%;
  top: calc(100% - 0.35em);
  z-index: 0;
  font: inherit;
  line-height: inherit;
  letter-spacing: 0.25em;
  color: var(--ink);
  opacity: 0;
  transform: translateX(-50%) translateY(0.06em) scaleY(-0.62);
  transform-origin: 50% 0;
  filter: blur(4px);
  white-space: nowrap;
  pointer-events: none;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.56), rgba(0,0,0,0.18) 44%, transparent 84%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.56), rgba(0,0,0,0.18) 44%, transparent 84%);
}

html[data-theme="night"] .title-effect[data-title-effect="lishi"]::before {
  background: linear-gradient(90deg, transparent, rgba(209, 138, 112, 0.56), rgba(242, 232, 210, 0.16), transparent);
  box-shadow: 0 0 18px rgba(209, 138, 112, 0.16);
}

html[data-theme="night"] .title-effect[data-title-effect="lishi"]::after {
  color: color-mix(in srgb, var(--ink) 82%, var(--vermilion));
  text-shadow: 0 0 18px rgba(209, 138, 112, 0.12);
}

.title-effect[data-title-effect="lishi"] .title-effect-text {
  opacity: 0;
  filter: blur(8px);
  transform: translateY(0.14em);
}

.title-effect[data-title-effect="lishi"].in .title-effect-text {
  animation: historyMirrorText 4200ms cubic-bezier(.18,.72,.16,1) both;
}

.title-effect[data-title-effect="lishi"].in::before {
  animation: historyMirrorLine 4300ms ease both;
}

.title-effect[data-title-effect="lishi"].in::after {
  animation: historyReflectionRise 4300ms cubic-bezier(.18,.72,.16,1) both;
}

.title-effect[data-title-effect="dushu"] .title-effect-char {
  opacity: 0.36;
  filter: blur(11px);
}

.title-effect[data-title-effect="dushu"].in .title-effect-char {
  animation: dushuCharClear 1650ms ease both;
  animation-delay: var(--clear-delay);
}

.title-effect[data-title-effect="dushu"] .title-effect-char::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 54%;
  width: 0.18em;
  height: 0.18em;
  border: 1px solid color-mix(in srgb, var(--vermilion) 58%, transparent);
  border-radius: 50%;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.18);
  pointer-events: none;
}

.title-effect[data-title-effect="dushu"].in .title-effect-char::after {
  animation: dushuRipple 1500ms ease-out both;
  animation-delay: var(--clear-delay);
}

.title-effect[data-title-effect="kuangjia"] .title-effect-char {
  clip-path: inset(0 0 100% 0);
  opacity: 0.95;
}

.title-effect[data-title-effect="kuangjia"].in .title-effect-char {
  animation: frameBuildDown 900ms cubic-bezier(.2,.76,.26,1) both;
  animation-delay: var(--build-delay);
}

.title-effect[data-title-effect="fangtan"] .title-effect-text {
  opacity: 0;
}

.title-lights {
  position: absolute;
  z-index: 3;
  inset: -0.12em -0.2em;
  pointer-events: none;
}

.title-light {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  background: #f0bd69;
  box-shadow: 0 0 12px rgba(240, 189, 105, 0.72);
  opacity: 0;
  transform: translate(var(--dx), var(--dy)) scale(0.35);
}

html[data-theme="night"] .title-light {
  background: #f3c678;
  box-shadow: 0 0 16px rgba(243, 198, 120, 0.78);
}

.title-effect[data-title-effect="fangtan"].in .title-light {
  animation: peopleLightGather 4300ms cubic-bezier(.16,.72,.18,1) both;
  animation-delay: var(--delay);
}

.title-effect[data-title-effect="fangtan"].in .title-effect-text {
  animation: peopleInkSettle 4400ms ease both;
}

@keyframes guoxueTextReveal {
  0% { opacity: 0; filter: blur(6px); transform: scale(0.992); }
  40% { opacity: 0.42; filter: blur(2.8px); }
  100% { opacity: 1; filter: blur(0); transform: scale(1); }
}

@keyframes guoxueCloudDrift {
  0% { opacity: 0.86; transform: translate(-50%, -50%) scale(1.08); }
  28% { opacity: 0.74; }
  100% { opacity: 0; transform: translate(calc(-50% + var(--dx)), calc(-50% + var(--dy))) scale(1.46) rotate(var(--rot)); }
}

@keyframes historyMirrorText {
  0% { opacity: 0; filter: blur(10px); transform: translateY(0.18em); }
  24% { opacity: 0.34; filter: blur(4.6px); transform: translateY(0.1em); }
  52% { opacity: 0.76; filter: blur(1.4px); transform: translateY(0.025em); }
  78% { opacity: 0.96; filter: blur(0.25px); transform: translateY(0); }
  100% { opacity: 1; filter: blur(0); transform: translateY(0); }
}

@keyframes historyMirrorLine {
  0% { opacity: 0; transform: scaleX(0.18); filter: blur(2px); }
  30% { opacity: 0.44; transform: scaleX(0.72); filter: blur(0.7px); }
  58% { opacity: 0.3; transform: scaleX(1); filter: blur(0.2px); }
  82% { opacity: 0.12; transform: scaleX(0.86); filter: blur(0.7px); }
  100% { opacity: 0; transform: scaleX(0.62); filter: blur(1.8px); }
}

@keyframes historyReflectionRise {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(-0.04em) scaleY(-0.42);
    filter: blur(9px);
  }
  30% {
    opacity: 0.14;
    transform: translateX(-50%) translateY(0.04em) scaleY(-0.5);
    filter: blur(5px);
  }
  52% {
    opacity: 0.3;
    transform: translateX(calc(-50% + 0.015em)) translateY(0.08em) scaleY(-0.62);
    filter: blur(2.4px);
  }
  70% {
    opacity: 0.18;
    transform: translateX(calc(-50% - 0.01em)) translateY(0.06em) scaleY(-0.58);
    filter: blur(3px);
  }
  86% {
    opacity: 0.08;
    transform: translateX(-50%) translateY(0.03em) scaleY(-0.48);
    filter: blur(5px);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(0) scaleY(-0.34);
    filter: blur(8px);
  }
}

@keyframes dushuCharClear {
  0% { opacity: 0.34; filter: blur(11px); transform: scale(0.98); }
  58% { opacity: 0.78; filter: blur(3px); }
  100% { opacity: 1; filter: blur(0); transform: scale(1); }
}

@keyframes dushuRipple {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.16); }
  18% { opacity: 0.46; }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(6.8); }
}

@keyframes frameBuildDown {
  0% { clip-path: inset(0 0 100% 0); filter: blur(0.7px); }
  100% { clip-path: inset(0 0 0 0); filter: blur(0); }
}

@keyframes peopleLightGather {
  0% { opacity: 0; transform: translate(var(--dx), var(--dy)) scale(0.32); background: #f0bd69; }
  18% { opacity: 1; }
  50% { opacity: 0.95; transform: translate(0, 0) scale(1); background: #f0bd69; }
  66% { opacity: 0.9; transform: translate(0, 0) scale(0.92); background: #e2ad61; box-shadow: 0 0 10px rgba(240, 189, 105, 0.42); }
  82% { opacity: 0.42; transform: translate(0, 0) scale(0.66); background: var(--ink); box-shadow: 0 0 3px color-mix(in srgb, var(--ink) 28%, transparent); }
  100% { opacity: 0; transform: translate(0, 0) scale(0.42); background: var(--ink); box-shadow: none; }
}

@keyframes peopleInkSettle {
  0%, 58% { opacity: 0; filter: blur(5px); }
  74% { opacity: 0.38; filter: blur(2.8px); }
  90% { opacity: 0.78; filter: blur(1.1px); }
  100% { opacity: 1; filter: blur(0); }
}

.reveal.in[data-scroll-fade] {
  opacity: var(--scroll-title-opacity, 1);
  transform: translateY(var(--scroll-title-y, 0px));
  filter: blur(var(--scroll-title-blur, 0px));
  transition: opacity 120ms linear, transform 120ms linear, filter 120ms linear;
}

.reading-list.motion-weave .reading-item .reading-status,
.reading-list.motion-weave .reading-item .reading-name,
.reading-list.motion-weave .reading-item .reading-line,
.reading-list.motion-weave .reading-item .reading-go {
  opacity: 0;
  transition: opacity 820ms var(--ease), transform 820ms var(--ease);
}

.reading-list.motion-weave .reading-item .reading-status {
  transform: translateX(-34px);
}

.reading-list.motion-weave .reading-item .reading-name,
.reading-list.motion-weave .reading-item .reading-line {
  transform: translateX(28px);
}

.reading-list.motion-weave .reading-item .reading-go {
  transform: translateX(18px);
}

.reading-list.motion-weave .reading-item.in .reading-status,
.reading-list.motion-weave .reading-item.in .reading-name,
.reading-list.motion-weave .reading-item.in .reading-line,
.reading-list.motion-weave .reading-item.in .reading-go {
  opacity: 1;
  transform: translateX(0);
}

.reading-list.motion-weave .reading-item.in .reading-name {
  transition-delay: 90ms;
}

.reading-list.motion-weave .reading-item.in .reading-line {
  transition-delay: 160ms;
}

.reading-list.motion-weave .reading-item.in .reading-go {
  transition-delay: 230ms;
}

.reading-list.motion-weave .reading-item:nth-child(2) .reading-status,
.reading-list.motion-weave .reading-item:nth-child(2) .reading-name,
.reading-list.motion-weave .reading-item:nth-child(2) .reading-line,
.reading-list.motion-weave .reading-item:nth-child(2) .reading-go {
  transition-duration: 900ms;
}

.reading-list.motion-weave .reading-item:nth-child(3) .reading-status,
.reading-list.motion-weave .reading-item:nth-child(3) .reading-name,
.reading-list.motion-weave .reading-item:nth-child(3) .reading-line,
.reading-list.motion-weave .reading-item:nth-child(3) .reading-go {
  transition-duration: 980ms;
}

.reading-list.motion-weave .reading-item:nth-child(4) .reading-status,
.reading-list.motion-weave .reading-item:nth-child(4) .reading-name,
.reading-list.motion-weave .reading-item:nth-child(4) .reading-line,
.reading-list.motion-weave .reading-item:nth-child(4) .reading-go {
  transition-duration: 1060ms;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  [data-scroll-fade],
  .title-effect-text,
  .title-effect-char,
  .reading-list.motion-weave .reading-item .reading-status,
  .reading-list.motion-weave .reading-item .reading-name,
  .reading-list.motion-weave .reading-item .reading-line,
  .reading-list.motion-weave .reading-item .reading-go {
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
    clip-path: none !important;
  }
  .title-cloud,
  .title-lights {
    display: none !important;
  }
}

/* ==================== Responsive ==================== */
@media (max-width: 900px) {
  .container { padding: 0 28px; }
  section { padding: 96px 0; }
  .title-effect-char:not(:last-child) { margin-right: 0.18em; }

  .site-header { padding: 20px 28px; }
  .brand { font-size: 16px; }
  .nav { display: none; }

  .page-hero { padding: 140px 0 80px; min-height: 60vh; }
  .page-hero .crumb { font-size: 11px; letter-spacing: 0.3em; }
  .page-hero .lede { font-size: 16px; }

  .pull-quote { margin: 64px auto; padding-left: 24px; }
  .pull-quote p { font-size: 18px; }
  .article-card {
    grid-template-columns: 56px 1fr;
    gap: 18px 24px;
    padding: 36px 0;
  }
  .article-card .read {
    grid-column: 2;
    justify-self: start;
  }
  .encounter-article { padding: 44px 0 108px; }
  .encounter-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .encounter-body {
    font-size: 18px;
    line-height: 1.84;
    letter-spacing: 0.02em;
  }
  .encounter-body h2 {
    margin-top: 72px;
    letter-spacing: 0.05em;
  }
  .encounter-body .quiet-line {
    margin: 44px 0;
    padding: 24px 22px;
    font-size: 18px;
  }
  .encounter-page .page-hero h1 {
    font-size: clamp(34px, 10vw, 56px);
    letter-spacing: 0.08em;
    padding-left: 0.08em;
  }
  .encounter-toc {
    position: static;
    order: -1;
    padding: 20px 0 24px;
    border-left: 0;
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
  }
  .encounter-toc a {
    display: inline-block;
    margin-right: 18px;
    padding: 8px 0;
    font-size: 13px;
  }
  .column-map { padding: 72px 0 96px; }
  .column-map .map-intro { margin-bottom: 56px; text-align: left; }
  .column-group {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 44px 0;
  }
  .line-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .line-block { padding-left: 20px; }
  .sutra-intro {
    margin-top: -12px;
    padding-left: 24px;
  }
  .sutra-directory { padding: 64px 0 108px; }
  .thread-shell {
    grid-template-columns: 1fr;
    gap: 56px;
  }
  .chapter-overview {
    grid-template-columns: 1fr;
    gap: 22px;
    margin-bottom: 44px;
    padding: 36px 0;
  }
  .thread-primary .article-card {
    grid-template-columns: 56px 1fr;
    gap: 18px 24px;
  }
  .foundation-panel {
    position: static;
    padding: 28px 24px;
  }
  .war-directory {
    padding: 56px 0 100px;
  }
  .war-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .war-card {
    min-height: 300px;
    padding: 24px;
  }
  .war-card h2 {
    font-size: 30px;
  }
  .korea-workbench .thread-shell {
    grid-template-columns: 1fr;
  }
  .korea-mainline {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .korea-mainline h2 {
    font-size: 28px;
  }
  .korea-action {
    justify-self: start;
  }
  .korea-topic-grid {
    grid-template-columns: 1fr;
  }
  .korea-topic {
    min-height: 0;
  }
  .korea-topic.korea-topic-link {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 22px 0 24px;
  }
  .mainline-map,
  .base-card-section {
    padding: 64px 0 108px;
  }
  .chapter-block {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 40px 0;
  }
  .chapter-articles .article-card {
    grid-template-columns: 56px 1fr;
    gap: 18px 24px;
  }
  .chapter-articles .article-card .read {
    grid-column: 2;
    justify-self: start;
  }
  .chapter-block ol {
    columns: 1;
  }
  .base-card-grid {
    grid-template-columns: 1fr;
  }
  .base-category-nav {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 48px;
  }
  .base-category-nav a {
    min-height: 58px;
    font-size: 16px;
  }
  .base-title-grid {
    grid-template-columns: 1fr;
  }
  .base-title-card {
    min-height: 72px;
    padding: 18px 20px;
  }
  .war-map-placeholder {
    min-height: 230px;
  }
  .woven-base {
    padding: 0 0 28px 80px;
    margin-top: -12px;
  }
  .woven-base a {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-left: 20px;
  }
  .woven-base a:hover { padding-left: 20px; }
  .woven-base .base-read { justify-self: start; }

  footer .container { flex-direction: column; gap: 24px; text-align: center; }
}

/* ==================== Study Reader ==================== */
.study-reader-page {
  --study-cn-font: "霞鹜文楷等宽 GB", "霞鹜文楷等宽GB", "霞骛文楷等宽 GB", "霞骛文楷等宽GB", "LXGW WenKai Mono GB", "LXGW WenKai Mono GB Screen", "LXGW WenKai Mono", "Microsoft YaHei UI", monospace;
  --study-en-font: "Times New Roman", Times, serif;
  font-family: var(--study-en-font), var(--study-cn-font);
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--paper) 97%, var(--vermilion)) 0, transparent 22%, transparent 78%, color-mix(in srgb, var(--paper) 96%, #d8a048) 100%),
    var(--paper);
}

html[data-theme="night"] .study-reader-page {
  background:
    radial-gradient(circle at 16% 14%, rgba(191, 142, 78, 0.14), transparent 34rem),
    radial-gradient(circle at 84% 18%, rgba(188, 103, 74, 0.09), transparent 30rem),
    var(--paper);
}

.study-reader {
  width: min(2160px, calc(100% - 16px));
  margin: 0 auto;
  padding: 148px 0 100px;
}

.study-reader-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 40px;
  margin-bottom: 52px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--hairline);
}

.study-reader-head .crumb {
  margin-bottom: 20px;
  color: var(--muted-ink);
  font-family: var(--serif-cn);
  font-size: 13px;
  letter-spacing: 0.22em;
}

.study-reader-head .sep {
  padding: 0 0.7em;
  opacity: 0.46;
}

.study-reader-head h1 {
  margin: 0 0 18px;
  color: var(--ink);
  font-family: var(--serif-cn);
  font-size: clamp(40px, 4vw, 68px);
  font-weight: 300;
  letter-spacing: 0.14em;
  line-height: 1.15;
}

.study-reader-head p {
  margin: 0;
  color: var(--muted-ink);
  font-size: 15px;
  line-height: 1.9;
  letter-spacing: 0.08em;
}

.study-export-pdf {
  flex: 0 0 auto;
  min-height: 38px;
  padding: 0 16px;
  border: 1px solid color-mix(in srgb, var(--vermilion) 38%, var(--hairline));
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  color: color-mix(in srgb, var(--vermilion) 72%, var(--ink));
  cursor: pointer;
  font-family: var(--study-cn-font);
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: background 200ms var(--ease), border-color 200ms var(--ease), color 200ms var(--ease), transform 200ms var(--ease);
}

.study-export-pdf:hover {
  border-color: color-mix(in srgb, var(--vermilion) 68%, var(--hairline));
  background: color-mix(in srgb, var(--vermilion) 7%, var(--paper));
  color: var(--vermilion);
  transform: translateY(-1px);
}

.answer-toggle {
  position: fixed;
  left: clamp(24px, 3.2vw, 58px);
  bottom: clamp(24px, 4vh, 44px);
  z-index: 104;
  min-width: 132px;
  height: 48px;
  border: 1px solid color-mix(in srgb, var(--vermilion) 42%, var(--hairline));
  background: color-mix(in srgb, var(--paper) 84%, transparent);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  letter-spacing: 0.14em;
  cursor: pointer;
  box-shadow: 0 18px 56px rgba(31, 23, 17, 0.12);
  backdrop-filter: blur(12px);
  transition: background 260ms var(--ease), border-color 260ms var(--ease), color 260ms var(--ease), transform 260ms var(--ease), box-shadow 260ms var(--ease);
}

.answer-toggle:hover {
  border-color: var(--vermilion);
  color: var(--vermilion);
  background: color-mix(in srgb, var(--vermilion) 8%, var(--paper));
  transform: translateY(-2px);
}

html[data-theme="night"] .answer-toggle {
  background: rgba(255, 239, 210, 0.06);
  box-shadow: inset 0 0 0 1px rgba(245, 210, 151, 0.04), 0 18px 56px rgba(0, 0, 0, 0.34);
}

.grammar-reader-page .answer-toggle {
  display: none;
}

.study-reader-grid {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1.26fr) minmax(260px, 330px);
  gap: clamp(18px, 1.35vw, 30px);
  align-items: start;
}

.study-note-menu,
.study-outline {
  position: sticky;
  top: 116px;
  color: var(--muted-ink);
}

.study-note-menu {
  max-height: calc(100vh - 148px);
  overflow-x: hidden;
  overflow-y: auto;
  padding: 30px 0 0;
  border-top: 1px solid var(--hairline);
}

.study-outline {
  max-height: calc(100vh - 148px);
  overflow-x: hidden;
  overflow-y: auto;
  padding: 30px 0 28px 20px;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.study-side-kicker {
  margin-bottom: 14px;
  color: var(--vermilion);
  font-family: var(--serif-en);
  font-size: 13px;
  font-style: italic;
  letter-spacing: 0.24em;
}

.study-note-menu h2,
.study-outline h2 {
  margin: 0 0 24px;
  color: var(--ink);
  font-family: var(--serif-cn);
  font-size: 25px;
  font-weight: 300;
  letter-spacing: 0.12em;
}

.study-outline-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.study-outline-head .study-side-kicker {
  margin-bottom: 14px;
}

.study-outline-head h2 {
  margin: 0;
}

.study-outline-map-toggle {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border: 1px solid color-mix(in srgb, var(--hairline) 82%, var(--vermilion));
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  color: var(--muted-ink);
  display: inline-grid;
  place-items: center;
  padding: 0;
  cursor: pointer;
  transition: color 240ms var(--ease), border-color 240ms var(--ease), background 240ms var(--ease), transform 240ms var(--ease), box-shadow 240ms var(--ease);
}

.study-outline-map-toggle:hover,
.study-outline-map-toggle[aria-pressed="true"] {
  color: var(--vermilion);
  border-color: color-mix(in srgb, var(--vermilion) 72%, var(--hairline));
  background: color-mix(in srgb, var(--vermilion) 7%, var(--paper));
  transform: translateY(-1px);
}

.study-outline-map-toggle[aria-pressed="true"] {
  box-shadow: 0 10px 28px color-mix(in srgb, var(--vermilion) 10%, transparent);
}

.study-outline-map-toggle svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.study-note-menu nav,
.study-outline nav {
  display: grid;
  gap: 8px;
}

.study-note-menu a {
  position: relative;
  display: block;
  padding: 16px 18px 16px 22px;
  border: 1px solid transparent;
  color: var(--muted-ink);
  font-size: 15px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  transition: border-color 260ms var(--ease), background 260ms var(--ease), color 260ms var(--ease), transform 260ms var(--ease);
}

.study-note-menu a::before {
  content: "";
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 0;
  width: 1px;
  background: var(--hairline);
  transition: background 260ms var(--ease), transform 260ms var(--ease);
}

.study-note-menu a:hover,
.study-note-menu a.active {
  border-color: var(--hairline);
  background: color-mix(in srgb, var(--vermilion) 6%, transparent);
  color: var(--ink);
  transform: translateX(3px);
}

.study-note-menu a:hover::before,
.study-note-menu a.active::before {
  background: var(--vermilion);
  transform: scaleY(1.45);
}

.study-note-group {
  border: 1px solid color-mix(in srgb, var(--hairline) 80%, transparent);
  background: color-mix(in srgb, var(--ink) 4%, var(--paper));
  transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.study-note-group[open] {
  background: var(--paper);
}

.study-note-group summary {
  list-style: none;
  position: relative;
  min-height: 58px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 10px 36px 10px 12px;
  color: color-mix(in srgb, var(--ink) 72%, var(--muted-ink));
  cursor: pointer;
  font-family: var(--study-cn-font);
  font-size: 14px;
  line-height: 1.55;
  letter-spacing: 0;
}

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

.study-note-group summary::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--vermilion);
  border-bottom: 1px solid var(--vermilion);
  transform: translateY(-60%) rotate(45deg);
  transition: transform 220ms var(--ease);
}

.study-note-group[open] summary::after {
  transform: translateY(-30%) rotate(225deg);
}

.study-note-group[open] summary {
  background: var(--paper);
  color: var(--ink);
}

.study-note-group-level-2 {
  border: 0;
  border-top: 1px solid color-mix(in srgb, var(--hairline) 58%, transparent);
  background: color-mix(in srgb, var(--ink) 4%, var(--paper));
}

.study-note-group-level-2[open] {
  background: var(--paper);
}

.study-note-group-level-2 summary {
  min-height: 48px;
  padding-left: 18px;
  font-size: 13px;
  color: var(--muted-ink);
}

.study-note-group-level-2 > summary:hover {
  color: var(--vermilion);
}

.study-note-group-level-2 > summary:hover::after {
  border-color: var(--vermilion);
}

.study-note-group-level-2[open] summary {
  background: var(--paper);
  color: var(--vermilion);
  font-weight: 700;
}

.study-note-group-level-2[open] summary::after {
  border-color: var(--vermilion);
}

.study-note-group-level-2.has-active-note > summary {
  color: var(--vermilion);
  font-weight: 700;
}

.study-note-group-level-2.has-active-note > summary::after {
  border-color: var(--vermilion);
}

.study-note-group-level-2 .study-note-group-links {
  border-top-color: color-mix(in srgb, var(--hairline) 48%, transparent);
}

.study-note-group-num {
  color: var(--vermilion);
  font-family: var(--study-en-font);
  font-size: 21px;
  line-height: 1;
  font-style: italic;
}

.study-note-group-title,
.study-note-link-title {
  min-width: 0;
  overflow-wrap: anywhere;
}

.study-note-group-count {
  justify-self: end;
  color: color-mix(in srgb, var(--muted-ink) 76%, transparent);
  font-family: var(--study-en-font);
  font-size: 12px;
}

.study-note-group-links {
  display: grid;
  gap: 0;
  padding: 0;
  border-top: 1px solid color-mix(in srgb, var(--hairline) 66%, transparent);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-3px);
  transition: max-height 240ms cubic-bezier(0.22, 0.8, 0.24, 1), opacity 160ms ease, transform 200ms cubic-bezier(0.22, 0.8, 0.24, 1);
  will-change: max-height, opacity, transform;
}

.study-note-group[open] > .study-note-group-links {
  opacity: 1;
  transform: translateY(0);
}

.study-note-group.is-collapsing > .study-note-group-links {
  opacity: 0;
  transform: translateY(-3px);
}

.study-note-group .study-note-group-links a {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 8px;
  padding: 12px 12px;
  border-top: 1px solid color-mix(in srgb, var(--hairline) 54%, transparent);
  border-right: 0;
  border-bottom: 0;
  border-left: 0;
  font-size: 13px;
  letter-spacing: 0;
}

.study-note-group .study-note-group-links a::before {
  display: none;
}

.study-note-link-num {
  color: var(--vermilion);
  font-family: var(--study-en-font);
  font-size: 16px;
  line-height: 1.35;
  opacity: 0.86;
}

.study-note-group .study-note-group-links a:hover,
.study-note-group .study-note-group-links a.active {
  background: color-mix(in srgb, var(--vermilion) 7%, transparent);
  color: var(--vermilion);
  transform: none;
}

.study-note-group .study-note-group-links a:hover .study-note-link-title,
.study-note-group .study-note-group-links a.active .study-note-link-title {
  color: var(--vermilion);
}

.study-note-group .study-note-group-links a.study-note-link-no-num {
  grid-template-columns: minmax(0, 1fr);
  padding-left: 18px;
}

.study-outline a {
  display: block;
  padding: 0;
  border: 0;
  max-width: 100%;
  color: var(--muted-ink);
  font-size: 14px;
  line-height: 1.72;
  letter-spacing: 0.02em;
  white-space: normal;
  overflow-wrap: break-word;
  word-break: normal;
  hyphens: auto;
  transition: color 220ms var(--ease), transform 220ms var(--ease);
}

.study-outline a:hover,
.study-outline a.is-active {
  color: var(--vermilion);
  transform: translateX(3px);
}

.study-outline .level-2 { padding-left: 10px; }
.study-outline .level-3 { padding-left: 22px; font-size: 13px; }
.study-outline .level-4 { padding-left: 34px; font-size: 13px; opacity: 0.88; }

.study-outline.is-map-open {
  width: min(520px, calc(100vw - 48px));
  margin-left: -210px;
  max-height: calc(100vh - 132px);
  padding: 28px 24px 30px;
  border: 1px solid color-mix(in srgb, var(--hairline) 86%, var(--vermilion));
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--paper) 94%, #fff), color-mix(in srgb, var(--paper) 98%, transparent)),
    var(--paper);
  box-shadow: 0 24px 70px rgba(31, 23, 17, 0.12);
  overflow-x: visible;
  z-index: 90;
}

.study-outline.is-map-open nav {
  position: relative;
  display: block;
  padding: 8px 0 4px 20px;
}

.study-outline.is-map-open nav::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 18px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(to bottom, transparent, color-mix(in srgb, var(--vermilion) 44%, var(--hairline)) 8%, color-mix(in srgb, var(--hairline) 82%, transparent) 92%, transparent);
}

.study-outline.is-map-open a {
  position: relative;
  display: block;
  width: fit-content;
  max-width: min(420px, 100%);
  margin: 0 0 13px;
  padding: 9px 13px 10px 15px;
  border: 1px solid color-mix(in srgb, var(--hairline) 74%, transparent);
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper) 86%, #fff);
  box-shadow: 0 10px 28px rgba(31, 23, 17, 0.06);
  color: color-mix(in srgb, var(--ink) 78%, var(--muted-ink));
  font-size: 13px;
  line-height: 1.55;
  letter-spacing: 0.02em;
  transform: none;
}

.study-outline.is-map-open a:hover {
  color: var(--vermilion);
  border-color: color-mix(in srgb, var(--vermilion) 48%, var(--hairline));
  transform: translateX(3px);
}

.study-outline.is-map-open a::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 50%;
  width: 20px;
  height: 1px;
  background: color-mix(in srgb, var(--vermilion) 34%, var(--hairline));
}

.study-outline.is-map-open a::after {
  content: "";
  position: absolute;
  left: -24px;
  top: calc(50% - 4px);
  width: 8px;
  height: 8px;
  border: 1px solid color-mix(in srgb, var(--vermilion) 68%, var(--hairline));
  border-radius: 999px;
  background: var(--paper);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--vermilion) 6%, transparent);
}

.study-outline.is-map-open .level-1 {
  margin-left: 0;
  color: var(--ink);
  border-color: color-mix(in srgb, var(--vermilion) 42%, var(--hairline));
}

.study-outline.is-map-open .level-2 { margin-left: 22px; padding-left: 15px; }
.study-outline.is-map-open .level-3 { margin-left: 52px; padding-left: 15px; font-size: 12px; }
.study-outline.is-map-open .level-4 { margin-left: 82px; padding-left: 15px; font-size: 12px; opacity: 0.9; }

.study-map-modal[hidden] {
  display: none;
}

.study-map-modal {
  position: fixed;
  inset: 0;
  z-index: 340;
  display: grid;
  place-items: center;
  padding: clamp(6px, 1vw, 14px);
  pointer-events: auto;
}

.study-map-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(26, 22, 20, 0.34);
  -webkit-backdrop-filter: blur(8px) saturate(0.9);
  backdrop-filter: blur(8px) saturate(0.9);
}

.study-map-panel {
  position: relative;
  width: min(1760px, 100%);
  height: min(980px, calc(100vh - clamp(12px, 2vw, 28px)));
  max-height: 100%;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  border: 1px solid color-mix(in srgb, var(--hairline) 72%, var(--vermilion));
  border-radius: 8px;
  padding: 0;
  background:
    radial-gradient(circle at 18% 52%, color-mix(in srgb, #7E78C8 8%, transparent), transparent 34%),
    linear-gradient(135deg, color-mix(in srgb, var(--paper) 94%, #fff), color-mix(in srgb, var(--paper) 99%, transparent)),
    var(--paper);
  box-shadow: 0 30px 96px rgba(31, 23, 17, 0.22);
  overflow: hidden;
}

.study-map-head {
  min-height: 94px;
  padding: 24px 28px 20px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
}

.study-map-head .study-side-kicker {
  margin-bottom: 10px;
}

.study-map-head h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif-cn);
  font-size: 26px;
  font-weight: 300;
  letter-spacing: 0.12em;
}

.study-map-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 8px;
  max-width: min(760px, 64vw);
}

.study-map-search {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  height: 36px;
  padding: 0 12px;
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper) 84%, #fff);
  color: var(--muted-ink);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.study-map-search input {
  width: 144px;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  letter-spacing: 0.02em;
}

.study-map-search input::placeholder {
  color: color-mix(in srgb, var(--muted-ink) 66%, transparent);
}

.study-map-zoom {
  display: inline-flex;
  align-items: center;
  height: 36px;
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
  border-radius: 999px;
  overflow: hidden;
  background: color-mix(in srgb, var(--paper) 84%, #fff);
}

.study-map-tool {
  min-width: 36px;
  height: 36px;
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper) 84%, #fff);
  color: var(--muted-ink);
  display: inline-grid;
  place-items: center;
  padding: 0 12px;
  cursor: pointer;
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.06em;
  transition: color 220ms var(--ease), border-color 220ms var(--ease), background 220ms var(--ease), transform 220ms var(--ease);
}

.study-map-zoom .study-map-tool {
  border: 0;
  border-radius: 0;
  background: transparent;
}

.study-map-scale {
  min-width: 54px;
  border-inline: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent) !important;
}

.study-map-tool:hover {
  color: var(--vermilion);
  border-color: color-mix(in srgb, var(--vermilion) 58%, var(--hairline));
  background: color-mix(in srgb, var(--vermilion) 6%, var(--paper));
  transform: translateY(-1px);
}

.study-map-close {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border: 1px solid color-mix(in srgb, var(--hairline) 84%, var(--vermilion));
  border-radius: 999px;
  background: transparent;
  color: var(--muted-ink);
  display: inline-grid;
  place-items: center;
  padding: 0;
  cursor: pointer;
  transition: color 220ms var(--ease), border-color 220ms var(--ease), background 220ms var(--ease), transform 220ms var(--ease);
}

.study-map-close:hover {
  color: var(--vermilion);
  border-color: var(--vermilion);
  background: color-mix(in srgb, var(--vermilion) 6%, transparent);
  transform: rotate(6deg);
}

.study-map-close svg {
  width: 17px;
  height: 17px;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
}

.study-map-scroll {
  min-width: 0;
  overflow: auto;
  padding: clamp(38px, 4.2vw, 68px);
}

.study-map-root {
  min-width: max-content;
  min-height: 100%;
  color: var(--muted-ink);
}

.study-map-canvas {
  display: grid;
  grid-template-columns: auto minmax(940px, 1fr);
  align-items: center;
  gap: clamp(76px, 7vw, 118px);
  min-width: max-content;
}

.study-map-root-label {
  position: sticky;
  left: 0;
  z-index: 2;
  flex: 0 0 auto;
  max-width: 230px;
  padding: 16px 24px 17px;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--vermilion) 62%, var(--hairline));
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--vermilion) 74%, #7E78C8), color-mix(in srgb, #7E78C8 58%, var(--vermilion)));
  color: var(--paper);
  box-shadow: 0 18px 42px color-mix(in srgb, var(--vermilion) 20%, transparent);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.45;
  text-align: center;
  white-space: normal;
}

.study-map-branches,
.study-map-children {
  list-style: none;
  margin: 0;
  padding: 0;
}

.study-map-branches {
  position: relative;
  display: grid;
  gap: 22px;
}

.study-map-branches::before {
  content: "";
  position: absolute;
  top: 50%;
  width: 1px;
  height: calc(100% - 44px);
  min-height: 28px;
  transform: translateY(-50%);
  background: color-mix(in srgb, #7E78C8 58%, var(--hairline));
}

.study-map-branches-right::before {
  left: calc(clamp(76px, 7vw, 118px) * -0.5);
}

.study-map-item {
  position: relative;
  margin: 0;
}

.study-map-item::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: 20px;
  width: clamp(46px, 5vw, 70px);
  height: 1px;
  background: color-mix(in srgb, #7E78C8 62%, var(--hairline));
}

.study-map-branches-right > .study-map-item::before {
  left: calc(clamp(76px, 7vw, 118px) * -0.5);
}

.study-map-node {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
}

.study-map-label {
  display: inline-flex;
  align-items: center;
  max-width: 360px;
  min-height: 38px;
  padding: 8px 14px 9px;
  border: 1px solid color-mix(in srgb, #7E78C8 34%, var(--hairline));
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper) 90%, #fff);
  color: color-mix(in srgb, var(--ink) 72%, var(--muted-ink));
  box-shadow: 0 10px 26px rgba(31, 23, 17, 0.055);
  font-size: 14px;
  line-height: 1.55;
  letter-spacing: 0.02em;
  white-space: normal;
  transition: color 220ms var(--ease), border-color 220ms var(--ease), background 220ms var(--ease), transform 220ms var(--ease);
}

.study-map-label,
.study-map-collapse,
.study-map-tool,
.study-map-close {
  cursor: pointer;
}

.study-map-label:hover {
  color: var(--vermilion);
  border-color: color-mix(in srgb, var(--vermilion) 54%, #7E78C8);
  background: color-mix(in srgb, var(--vermilion) 5%, var(--paper));
  transform: translateX(3px);
}

.study-map-label:focus-visible,
.study-map-collapse:focus-visible,
.study-map-close:focus-visible,
.study-outline-map-toggle:focus-visible,
.study-map-tool:focus-visible,
.study-map-search:focus-within {
  outline: 2px solid color-mix(in srgb, var(--vermilion) 54%, #7E78C8);
  outline-offset: 3px;
}

.study-map-collapse,
.study-map-collapse-spacer {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
}

.study-map-collapse {
  border: 1px solid color-mix(in srgb, #7E78C8 54%, var(--hairline));
  border-radius: 999px;
  background: var(--paper);
  color: #7E78C8;
  display: inline-grid;
  place-items: center;
  padding: 0;
  cursor: pointer;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease), background 200ms var(--ease);
}

.study-map-collapse:hover {
  color: var(--vermilion);
  border-color: var(--vermilion);
  background: color-mix(in srgb, var(--vermilion) 6%, var(--paper));
}

.study-map-collapse svg {
  width: 13px;
  height: 13px;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  transition: transform 200ms var(--ease);
}

.study-map-item:not(.is-collapsed) > .study-map-node .study-map-collapse svg path:last-child {
  opacity: 0;
}

.study-map-item.is-collapsed > .study-map-node .study-map-collapse svg {
  transform: rotate(90deg);
}

.study-map-children {
  position: relative;
  display: grid;
  gap: 14px;
  margin-top: 14px;
  margin-left: 112px;
}

.study-map-children::before {
  content: "";
  position: absolute;
  left: -57px;
  top: -2px;
  bottom: 22px;
  width: 1px;
  background: color-mix(in srgb, #7E78C8 44%, var(--hairline));
}

.study-map-children .study-map-item::before {
  left: -57px;
  width: 57px;
}

.study-map-item.is-collapsed > .study-map-children {
  display: none;
}

.study-map-item.level-1 > .study-map-node .study-map-label {
  color: var(--ink);
  border-color: color-mix(in srgb, #7E78C8 54%, var(--hairline));
  background: color-mix(in srgb, #7E78C8 7%, var(--paper));
  font-size: 15px;
}

.study-map-item.level-3 > .study-map-node .study-map-label,
.study-map-item.level-4 > .study-map-node .study-map-label {
  font-size: 13px;
}

.study-map-label.is-active {
  color: var(--vermilion);
  border-color: color-mix(in srgb, var(--vermilion) 58%, #7E78C8);
  background: color-mix(in srgb, var(--vermilion) 8%, var(--paper));
  box-shadow: 0 12px 32px color-mix(in srgb, var(--vermilion) 12%, transparent);
}

.study-map-label.is-search-hit {
  color: color-mix(in srgb, var(--ink) 82%, #8d5c00);
  border-color: color-mix(in srgb, #d8a048 64%, var(--hairline));
  background: color-mix(in srgb, #d8a048 18%, var(--paper));
}

.study-map-open {
  overflow: hidden;
}

.study-heading-flash {
  animation: study-heading-pulse 2.35s var(--ease) 1;
  border-radius: 6px;
}

@keyframes study-heading-pulse {
  0%, 100% {
    background: transparent;
    box-shadow: none;
  }
  18%, 48%, 78% {
    background: color-mix(in srgb, var(--vermilion) 12%, transparent);
    box-shadow: 0 0 0 8px color-mix(in srgb, var(--vermilion) 5%, transparent);
  }
  32%, 62% {
    background: color-mix(in srgb, #7E78C8 10%, transparent);
    box-shadow: 0 0 0 4px color-mix(in srgb, #7E78C8 5%, transparent);
  }
}

.study-outline-empty {
  display: block;
  font-size: 13px;
  line-height: 1.8;
}

.study-sheet {
  min-width: 0;
  max-width: 100%;
  padding: clamp(32px, 3.55vw, 58px);
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--paper) 88%, #fff) 0, color-mix(in srgb, var(--paper) 96%, transparent) 100%);
  box-shadow: 0 26px 90px rgba(31, 23, 17, 0.08);
  color: var(--ink);
  font-family: var(--study-en-font), var(--study-cn-font);
  font-size: 19px;
  line-height: 1.88;
  letter-spacing: 0;
  overflow: hidden;
  overflow-wrap: anywhere;
}

.study-highlight-toolbar {
  position: fixed;
  z-index: 340;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 7px 9px;
  border: 1px solid color-mix(in srgb, var(--hairline) 70%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--panel) 90%, var(--paper));
  box-shadow: 0 18px 44px rgba(31, 23, 17, 0.14);
  backdrop-filter: blur(16px);
}

.study-highlight-toolbar[hidden] {
  display: none;
}

.study-highlight-swatch,
.study-highlight-clear {
  width: 28px;
  height: 28px;
  border: 1px solid color-mix(in srgb, var(--study-highlight-line, var(--hairline)) 76%, var(--hairline));
  border-radius: 999px;
  background: var(--study-highlight-bg, transparent);
  color: var(--ink);
  cursor: pointer;
  flex: 0 0 auto;
  padding: 0;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), border-color 180ms var(--ease);
}

.study-highlight-swatch:hover,
.study-highlight-clear:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 14px color-mix(in srgb, var(--study-highlight-line, var(--vermilion)) 28%, transparent);
}

.study-highlight-clear {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-color: color-mix(in srgb, var(--hairline) 90%, var(--muted-ink));
  background: transparent;
  color: var(--muted-ink);
  font-family: var(--study-en-font), var(--study-cn-font);
  font-size: 15px;
  line-height: 1;
}

.study-user-highlight {
  padding: 0.02em 0.12em 0.05em;
  border-radius: 2px;
  background: color-mix(in srgb, var(--study-highlight-bg) 74%, transparent);
  box-shadow:
    0 0.05em 0 rgba(255, 255, 255, 0.72),
    inset 0 0 0 1px color-mix(in srgb, var(--study-highlight-bg) 28%, transparent);
  color: inherit;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

html[data-theme="night"] .study-sheet {
  background:
    linear-gradient(135deg, rgba(255, 238, 208, 0.07), rgba(143, 191, 232, 0.035)),
    rgba(12, 11, 10, 0.54);
  box-shadow: inset 0 0 0 1px rgba(245, 210, 151, 0.03), 0 28px 90px rgba(0, 0, 0, 0.34);
}

html[data-theme="night"] .study-highlight-toolbar {
  background: rgba(24, 21, 18, 0.92);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.38);
}

html[data-theme="night"] .study-user-highlight {
  background: color-mix(in srgb, var(--study-highlight-bg) 48%, transparent);
  box-shadow:
    0 0.05em 0 rgba(12, 11, 10, 0.52),
    inset 0 0 0 1px color-mix(in srgb, var(--study-highlight-line) 30%, transparent);
}

html[data-theme="night"] .study-outline.is-map-open {
  background:
    linear-gradient(135deg, rgba(255, 238, 208, 0.07), rgba(143, 191, 232, 0.035)),
    rgba(12, 11, 10, 0.74);
  box-shadow: inset 0 0 0 1px rgba(245, 210, 151, 0.03), 0 24px 70px rgba(0, 0, 0, 0.38);
}

html[data-theme="night"] .study-outline.is-map-open a {
  background: rgba(255, 239, 210, 0.055);
  box-shadow: none;
}

html[data-theme="night"] .study-map-backdrop {
  background: rgba(3, 3, 3, 0.74);
  -webkit-backdrop-filter: blur(14px) saturate(0.72);
  backdrop-filter: blur(14px) saturate(0.72);
}

html[data-theme="night"] .study-map-panel {
  background:
    radial-gradient(circle at 18% 52%, rgba(143, 138, 214, 0.13), transparent 36%),
    linear-gradient(135deg, rgba(255, 238, 208, 0.07), rgba(143, 191, 232, 0.04)),
    rgba(12, 11, 10, 0.86);
  box-shadow: inset 0 0 0 1px rgba(245, 210, 151, 0.04), 0 30px 96px rgba(0, 0, 0, 0.46);
}

html[data-theme="night"] .study-map-root-label {
  color: #151210;
  background: color-mix(in srgb, #E0B17D 82%, #8F8AD6);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.24);
}

html[data-theme="night"] .study-map-label,
html[data-theme="night"] .study-map-collapse,
html[data-theme="night"] .study-map-search,
html[data-theme="night"] .study-map-zoom,
html[data-theme="night"] .study-map-tool {
  background: rgba(255, 239, 210, 0.055);
  box-shadow: none;
}

html[data-theme="night"] .study-map-search input {
  color: #F6E7C8;
}

html[data-theme="night"] .study-map-item.level-1 > .study-map-node .study-map-label {
  background: rgba(143, 138, 214, 0.12);
}

.study-note-title {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  margin-bottom: 30px;
  padding: 0 16px;
  border: 1px solid var(--hairline);
  color: var(--vermilion);
  font-family: var(--serif-cn);
  font-size: 14px;
  letter-spacing: 0.18em;
}

.study-sheet h1,
.study-sheet h2,
.study-sheet h3,
.study-sheet h4,
.study-sheet h5,
.study-sheet h6 {
  scroll-margin-top: 118px;
  font-family: var(--serif-cn);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.45;
}

.study-sheet h1 {
  color: color-mix(in srgb, var(--ink) 76%, #9f4a2f);
  margin: 0 0 34px;
  padding-bottom: 25px;
  border-bottom: 1px solid var(--hairline);
  font-size: clamp(30px, 2.55vw, 44px);
}

.study-sheet h1:not(:first-of-type) {
  margin-top: 78px;
}

.study-sheet h2 {
  color: color-mix(in srgb, var(--ink) 70%, #9a6231);
  margin: 56px 0 22px;
  font-size: clamp(23px, 1.9vw, 31px);
}

.study-sheet h3 {
  margin: 42px 0 16px;
  color: color-mix(in srgb, var(--ink) 66%, #6f7560);
  font-size: 22px;
}

.study-sheet h4 {
  margin: 32px 0 12px;
  color: color-mix(in srgb, var(--ink) 62%, #526d78);
  font-size: 20px;
}

.study-sheet h5 {
  margin: 26px 0 10px;
  color: color-mix(in srgb, var(--ink) 58%, #8b5f76);
  font-size: 18px;
}

.study-sheet h6 {
  margin: 22px 0 8px;
  color: color-mix(in srgb, var(--ink) 54%, #7b6b52);
  font-size: 17px;
  font-weight: 500;
}

html[data-theme="night"] .study-sheet h1 { color: #F0A17F; }
html[data-theme="night"] .study-sheet h2 { color: #E5B967; }
html[data-theme="night"] .study-sheet h3 { color: #8FD6BD; }
html[data-theme="night"] .study-sheet h4 { color: #C9A48E; }
html[data-theme="night"] .study-sheet h5 { color: #D7A8DF; }
html[data-theme="night"] .study-sheet h6 { color: #CFBC8B; }

.study-sheet table h1,
.study-sheet table h2,
.study-sheet table h3,
.study-sheet table h4,
.study-sheet table h5,
.study-sheet table h6 {
  color: inherit;
  font-size: inherit;
  line-height: inherit;
  letter-spacing: inherit;
}

.study-sheet p,
.study-sheet ul,
.study-sheet ol {
  margin: 0 0 20px;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.study-sheet strong {
  color: color-mix(in srgb, var(--vermilion) 72%, var(--ink));
  font-weight: 700;
}

html[data-theme="night"] .study-sheet strong {
  color: #E0B17D;
  font-weight: 700;
}

.study-sheet ul,
.study-sheet ol {
  padding-left: 1.6em;
}

.study-sheet li {
  margin-bottom: 8px;
  padding-left: 0.18em;
  overflow-wrap: anywhere;
}

.study-sheet code {
  padding: 0.15em 0.42em;
  background: color-mix(in srgb, var(--vermilion) 9%, transparent);
  font-size: 0.92em;
}

.study-callout {
  margin: 24px 0 30px;
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, var(--vermilion));
  border-left: 3px solid color-mix(in srgb, var(--vermilion) 72%, #d8a048);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--vermilion) 5%, transparent), transparent 52%),
    color-mix(in srgb, var(--paper) 95%, #fff);
}

.study-callout-title {
  padding: 14px 18px 10px;
  border-bottom: 1px solid color-mix(in srgb, var(--hairline) 68%, transparent);
  color: var(--vermilion);
  font-family: var(--serif-cn);
  font-size: 15px;
  letter-spacing: 0.18em;
}

.study-callout-body {
  padding: 16px 18px 4px;
}

.study-callout-body > :last-child {
  margin-bottom: 14px;
}

html[data-theme="night"] .study-callout {
  background: rgba(255, 239, 210, 0.055);
}

.study-sentence-card {
  margin: 30px 0 18px;
  padding: 0;
  border: 0;
  background: transparent;
}

.study-sheet .study-sentence-heading {
  display: grid;
  gap: 9px;
  margin: 0;
  color: color-mix(in srgb, var(--ink) 86%, #2c2420);
  font-family: var(--study-en-font), var(--study-cn-font);
  font-size: clamp(20px, 1.42vw, 24px);
  font-weight: 400;
  line-height: 1.72;
  letter-spacing: 0;
}

.study-sentence-heading span {
  color: var(--vermilion);
  font-family: var(--study-en-font);
  font-size: 13px;
  font-style: italic;
  line-height: 1;
}

.study-sentence-actions,
.study-floating-actions {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.study-floating-actions {
  margin: 18px 0 24px;
}

.study-callout-fold {
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
}

.study-callout-fold summary {
  list-style: none;
  position: relative;
  min-height: 42px;
  display: flex;
  align-items: center;
  padding: 8px 44px 8px 15px;
  color: color-mix(in srgb, var(--ink) 74%, var(--vermilion));
  cursor: pointer;
  font-family: var(--study-cn-font);
  font-size: 15px;
  line-height: 1.5;
}

.study-callout-fold summary::-webkit-details-marker {
  display: none;
}

.study-callout-fold summary::after {
  content: "";
  position: absolute;
  right: 17px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--vermilion);
  border-bottom: 1px solid var(--vermilion);
  transform: translateY(-60%) rotate(45deg);
  transition: transform 220ms var(--ease);
}

.study-callout-fold[open] summary {
  border-bottom: 1px solid color-mix(in srgb, var(--hairline) 66%, transparent);
  color: var(--vermilion);
}

.study-callout-fold[open] summary::after {
  transform: translateY(-30%) rotate(225deg);
}

.study-callout-fold-body {
  padding: 16px 18px 4px;
  color: var(--ink);
  font-family: var(--study-en-font), var(--study-cn-font);
  font-size: 17px;
  line-height: 1.94;
  overflow-wrap: anywhere;
}

.study-callout-fold-body > :last-child {
  margin-bottom: 14px;
}

.study-callout-chip {
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, var(--vermilion));
  border-radius: 0;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  color: color-mix(in srgb, var(--ink) 76%, var(--vermilion));
  cursor: pointer;
  font: inherit;
  font-family: var(--study-cn-font);
  font-size: 14px;
  letter-spacing: 0;
  transition: color 220ms var(--ease), border-color 220ms var(--ease), background 220ms var(--ease), transform 220ms var(--ease);
}

.study-callout-chip:hover {
  border-color: var(--vermilion);
  background: color-mix(in srgb, var(--vermilion) 7%, var(--paper));
  color: var(--vermilion);
  transform: translateY(-1px);
}

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

.study-popover-modal[hidden] {
  display: none;
}

.study-popover-modal {
  position: fixed;
  inset: 0;
  z-index: 360;
  display: grid;
  place-items: center;
  padding: clamp(12px, 2vw, 28px);
}

.study-popover-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(26, 22, 20, 0.34);
  -webkit-backdrop-filter: blur(8px) saturate(0.9);
  backdrop-filter: blur(8px) saturate(0.9);
}

.study-popover-dialog {
  position: relative;
  width: min(860px, 100%);
  max-height: min(820px, calc(100vh - 36px));
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  border: 1px solid color-mix(in srgb, var(--hairline) 70%, var(--vermilion));
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--paper) 96%, #fff), color-mix(in srgb, var(--paper) 98%, transparent)),
    var(--paper);
  box-shadow: 0 30px 96px rgba(31, 23, 17, 0.2);
}

.study-popover-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 26px 18px;
  border-bottom: 1px solid color-mix(in srgb, var(--hairline) 72%, transparent);
}

.study-popover-head h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--study-cn-font);
  font-size: 26px;
  font-weight: 400;
  letter-spacing: 0;
}

.study-popover-close {
  width: 34px;
  height: 34px;
  border: 1px solid color-mix(in srgb, var(--hairline) 82%, var(--vermilion));
  border-radius: 999px;
  background: transparent;
  color: var(--muted-ink);
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
}

.study-popover-content {
  min-width: 0;
  overflow: auto;
  padding: 24px 28px 32px;
  font-family: var(--study-en-font), var(--study-cn-font);
  font-size: 18px;
  line-height: 1.9;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.study-font-note {
  color: var(--note-color);
}

html[data-theme="night"] .study-font-note {
  color: color-mix(in srgb, var(--note-color) 82%, #FFE0B4);
  font-weight: 650;
}

.study-answer {
  padding: 0.11em 0.28em 0.18em;
  border-radius: 2px;
  background: color-mix(in srgb, #d8a048 24%, var(--paper));
  color: color-mix(in srgb, var(--ink) 92%, #79430d);
  cursor: default;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
  transition: color 220ms var(--ease), background 220ms var(--ease), text-shadow 220ms var(--ease);
}

html[data-theme="night"] .study-answer {
  background: rgba(210, 146, 54, 0.28);
  color: #FFE2A8;
}

.answers-hidden .study-answer {
  color: transparent;
  border-radius: 0;
  cursor: default;
  background:
    linear-gradient(180deg, transparent calc(100% - 0.18em), color-mix(in srgb, var(--vermilion) 44%, var(--ink)) calc(100% - 0.18em), color-mix(in srgb, var(--vermilion) 44%, var(--ink)) calc(100% - 0.09em), transparent calc(100% - 0.09em));
  text-shadow: none;
  user-select: none;
}

.answers-hidden .study-answer:hover,
.answers-hidden .study-answer:focus-visible {
  color: color-mix(in srgb, var(--ink) 92%, #79430d);
  border-radius: 2px;
  outline: none;
  background: color-mix(in srgb, #d8a048 24%, var(--paper));
  user-select: text;
}

html[data-theme="night"] .answers-hidden .study-answer {
  color: transparent;
  -webkit-text-fill-color: transparent;
  background:
    linear-gradient(180deg, transparent calc(100% - 0.18em), rgba(255, 196, 103, 0.78) calc(100% - 0.18em), rgba(255, 196, 103, 0.78) calc(100% - 0.09em), transparent calc(100% - 0.09em));
}

html[data-theme="night"] .answers-hidden .study-answer:hover,
html[data-theme="night"] .answers-hidden .study-answer:focus-visible {
  color: #FFE2A8;
  -webkit-text-fill-color: currentColor;
  background: rgba(210, 146, 54, 0.28);
}

.study-table-wrap {
  max-width: 100%;
  margin: 28px 0 36px;
  overflow-x: auto;
  border: 1px solid var(--hairline);
  background: color-mix(in srgb, var(--paper) 94%, var(--vermilion));
}

html[data-theme="night"] .study-table-wrap {
  background: rgba(255, 234, 195, 0.04);
}

.study-image {
  width: min(100%, var(--study-image-width, 100%));
  margin: 24px auto 30px;
  padding: 0;
  border: 0;
  background: transparent;
}

.study-image img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

html[data-theme="night"] .study-image {
  background: transparent;
}

.study-sheet table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.02em;
}

.study-sheet th,
.study-sheet td {
  min-width: 84px;
  padding: 15px 16px;
  border: 1px solid var(--hairline);
  vertical-align: top;
  text-align: left;
}

.study-sheet th {
  color: var(--ink);
  background: color-mix(in srgb, var(--vermilion) 8%, var(--paper));
  font-weight: 500;
}

html[data-theme="night"] .study-sheet th {
  background: rgba(226, 168, 91, 0.11);
}

.study-embed,
.study-wikilink {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 32px;
  margin: 0.25em 0.14em;
  padding: 0 13px;
  border: 1px dashed color-mix(in srgb, var(--vermilion) 42%, var(--hairline));
  background: color-mix(in srgb, var(--vermilion) 5%, transparent);
  color: var(--muted-ink);
  font-size: 0.92em;
  line-height: 1.4;
}

.study-embed::before {
  content: "图示";
  margin-right: 9px;
  color: var(--vermilion);
  font-size: 0.82em;
  letter-spacing: 0.14em;
}

.study-wikilink::before {
  content: "注";
  margin-right: 9px;
  color: var(--vermilion);
  font-size: 0.82em;
}

.study-loading,
.study-load-error {
  min-height: 220px;
  display: grid;
  place-items: center;
  color: var(--muted-ink);
  font-family: var(--serif-cn);
  font-size: 18px;
  letter-spacing: 0.16em;
}

.reading-nav .nav-trigger,
.reading-nav .nav-flyout-trigger {
  color: var(--ink);
}

.reading-nav {
  gap: 24px;
}

.reading-nav .reading-nav-menu {
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 0;
  padding: 9px 10px;
  border: 1px solid var(--hairline);
  background: var(--panel);
  box-shadow: 0 16px 36px var(--shadow-soft);
  flex-direction: column;
  gap: 7px;
}

.reading-nav .nav-dropdown:hover .reading-nav-menu,
.reading-nav .nav-dropdown:focus-within .reading-nav-menu {
  transform: translateX(-50%) translateY(0);
}

.reading-nav .reading-nav-menu a {
  display: block;
  padding: 1px 0;
  border-bottom: 1px solid transparent;
  color: var(--muted-ink);
  white-space: nowrap;
}

.reading-nav .reading-nav-menu a:hover {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
  background: transparent;
}

.nav-flyout {
  position: relative;
  display: block;
}

.nav-flyout-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.nav-flyout-trigger::after {
  content: "";
  width: 7px;
  height: 7px;
  border-top: 1px solid currentColor;
  border-right: 1px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.62;
}

.nav-flyout-menu {
  position: absolute;
  top: 0;
  left: calc(100% + 16px);
  min-width: 0;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  display: flex;
  gap: 16px;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-10px);
  transition: opacity 220ms var(--ease), visibility 220ms var(--ease), transform 220ms var(--ease);
}

.nav-flyout:hover .nav-flyout-menu,
.nav-flyout:focus-within .nav-flyout-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.nav-flyout-menu a {
  display: block;
  padding: 0;
  color: var(--muted-ink);
  white-space: nowrap;
}

.nav-flyout-menu a:hover {
  color: var(--vermilion);
  background: transparent;
}

html[data-theme="night"] .nav-flyout-menu {
  background: transparent;
  box-shadow: none;
}

.external-digest-reader-page .study-reader {
  width: min(2380px, calc(100% - 18px));
}

.external-digest-reader-page .study-reader-grid {
  grid-template-columns: minmax(250px, 310px) minmax(0, 1fr) minmax(320px, 420px);
  gap: clamp(18px, 1.25vw, 28px);
}

.external-digest-reader-page .study-sheet {
  font-family: var(--study-en-font), var(--study-cn-font);
  font-size: clamp(20px, 1.19vw, 23px);
  line-height: 1.86;
}

.external-digest-reader-page .study-sheet p {
  text-align: left;
}

.external-digest-reader-page .study-sheet > p:first-of-type {
  margin-bottom: 20px;
  color: color-mix(in srgb, var(--ink) 82%, var(--vermilion));
  font-size: clamp(28px, 2.25vw, 41px);
  line-height: 1.35;
}

.external-digest-reader-page .study-sheet em {
  color: color-mix(in srgb, var(--ink) 74%, var(--muted-ink));
  font-style: italic;
}

.kaoyan-reading-page .study-sheet > p:first-of-type {
  margin-bottom: 28px;
  color: var(--ink);
  font-size: inherit;
  line-height: inherit;
}

.study-kaoyan-paragraph {
  position: relative;
}

.study-kaoyan-paragraph-label {
  display: inline-flex;
  align-items: center;
  margin-right: 0.55em;
  color: color-mix(in srgb, var(--pine) 82%, #39a993);
  font-family: var(--study-en-font);
  font-size: 0.9em;
  font-weight: 800;
  line-height: 1;
}

.study-sentence-inline-mark {
  display: inline-flex;
  align-items: center;
  margin-right: 0.18em;
  color: color-mix(in srgb, var(--vermilion) 72%, var(--ink));
  font-family: var(--study-cn-font);
  font-size: 0.78em;
  font-weight: 700;
  line-height: 1;
  vertical-align: 0.08em;
}

.kaoyan-reading-page .study-sheet h5 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 52px 0 16px;
  padding-top: 24px;
  border-top: 1px solid color-mix(in srgb, var(--hairline) 72%, transparent);
  color: color-mix(in srgb, var(--ink) 76%, var(--pine));
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.kaoyan-reading-page .study-sheet h5::before {
  content: "";
  width: 5px;
  height: 22px;
  border-radius: 999px;
  background: var(--pine);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--pine) 10%, transparent);
}

.kaoyan-reading-page .study-sheet h5 + p {
  margin-top: 0;
}

.kaoyan-reading-page .study-footnote-ref {
  margin: 0 0.05em;
  padding: 0.03em 0.18em;
}

.study-code-block {
  margin: 18px 0 28px;
  padding: 16px 18px;
  border-left: 3px solid color-mix(in srgb, var(--vermilion) 62%, var(--hairline));
  background: color-mix(in srgb, var(--vermilion) 5%, transparent);
  color: color-mix(in srgb, var(--ink) 74%, var(--muted-ink));
  font-family: var(--study-cn-font);
  font-size: 18px;
  line-height: 1.8;
}

.study-footnote-ref {
  display: inline;
  margin: 0 0.05em;
  padding: 0.03em 0.18em;
  border-radius: 999px;
  color: var(--vermilion);
  text-decoration: none;
  vertical-align: super;
  user-select: none;
  -webkit-user-select: none;
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease), color 180ms var(--ease);
}

.study-footnote-ref sup {
  font-family: var(--study-en-font);
  font-size: 0.6em;
  line-height: 1;
  user-select: none;
  -webkit-user-select: none;
}

.study-footnote-ref:hover {
  color: color-mix(in srgb, var(--vermilion) 82%, #7E78C8);
}

.study-footnote-ref.is-active {
  color: #7E78C8;
  background: color-mix(in srgb, #F7E7A7 46%, var(--paper));
  box-shadow: 0 0 0 2px color-mix(in srgb, #F0C36B 18%, transparent), 0 0 14px color-mix(in srgb, #7E78C8 16%, transparent);
  text-shadow: none;
  animation: studyFootnoteFlash 860ms ease-in-out 2;
}

.study-footnote-ref:target {
  background: color-mix(in srgb, #F7E7A7 42%, var(--paper));
  box-shadow: 0 0 0 2px color-mix(in srgb, #F0C36B 16%, transparent);
  animation: studyFootnoteFlash 860ms ease-in-out 2;
}

@keyframes studyFootnoteFlash {
  0%, 100% {
    color: var(--vermilion);
    background: transparent;
    box-shadow: none;
    text-shadow: none;
    transform: translateY(0);
  }
  45% {
    color: #7E78C8;
    background: color-mix(in srgb, #F7E7A7 46%, var(--paper));
    box-shadow: 0 0 0 2px color-mix(in srgb, #F0C36B 18%, transparent), 0 0 14px color-mix(in srgb, #7E78C8 16%, transparent);
    text-shadow: none;
    transform: translateY(-1px);
  }
}

.study-digest-lead-en,
.study-digest-lead-zh {
  padding: 0;
  color: color-mix(in srgb, var(--ink) 74%, var(--muted-ink));
  font-size: clamp(20px, 1.19vw, 23px);
  font-weight: 400;
  line-height: 1.86;
}

.study-digest-lead-en {
  margin: 2px 0 16px;
  font-family: var(--study-en-font), var(--study-cn-font);
  font-style: italic;
}

.study-digest-lead-zh {
  margin: 0 0 30px;
  padding: 0 0 18px 18px;
  border-left: 2px solid color-mix(in srgb, var(--vermilion) 42%, var(--hairline));
  color: color-mix(in srgb, var(--ink) 66%, var(--muted-ink));
  font-family: var(--study-cn-font);
  font-size: 18px;
  line-height: 1.9;
}

.study-translation-fold {
  margin: -8px 0 28px;
  border: 1px solid color-mix(in srgb, var(--hairline) 76%, transparent);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
}

.study-translation-fold summary {
  list-style: none;
  position: relative;
  min-height: 40px;
  display: flex;
  align-items: center;
  padding: 8px 42px 8px 15px;
  color: color-mix(in srgb, var(--ink) 74%, var(--vermilion));
  cursor: pointer;
  font-family: var(--study-cn-font);
  font-size: 15px;
  line-height: 1.5;
}

.study-translation-fold summary::-webkit-details-marker {
  display: none;
}

.study-translation-fold summary::after {
  content: "";
  position: absolute;
  right: 17px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--vermilion);
  border-bottom: 1px solid var(--vermilion);
  transform: translateY(-60%) rotate(45deg);
  transition: transform 220ms var(--ease);
}

.study-translation-fold[open] summary {
  border-bottom: 1px solid color-mix(in srgb, var(--hairline) 66%, transparent);
  color: var(--vermilion);
}

.study-translation-fold[open] summary::after {
  transform: translateY(-30%) rotate(225deg);
}

.study-translation-body {
  padding: 15px 18px 16px;
  color: var(--muted-ink);
  font-family: var(--study-cn-font);
  font-size: 18px;
  line-height: 1.9;
}

.study-vocab-panel {
  position: sticky;
  top: 116px;
  max-height: calc(100vh - 148px);
  overflow-x: hidden;
  overflow-y: auto;
  padding: 30px 0 28px 20px;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
  color: var(--muted-ink);
}

.kaoyan-reading-page .study-vocab-panel {
  top: 72px;
  max-height: calc(100vh - 92px);
  padding: 10px 16px 28px;
  border: 1px solid color-mix(in srgb, var(--hairline) 86%, transparent);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--paper) 96%, #fff), color-mix(in srgb, var(--paper) 91%, transparent)),
    var(--paper);
  box-shadow: 0 18px 52px rgba(31, 23, 17, 0.07);
}

.study-vocab-panel h2 {
  margin: 0 0 24px;
  color: var(--ink);
  font-family: var(--serif-cn);
  font-size: 25px;
  font-weight: 300;
  letter-spacing: 0.12em;
}

.kaoyan-reading-page .study-vocab-panel .study-side-kicker,
.kaoyan-reading-page .study-vocab-panel h2 {
  display: none;
}

.study-side-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  margin: 0 0 20px;
  padding: 5px;
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
  border-radius: 13px;
  background: color-mix(in srgb, var(--ink) 4%, var(--paper));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.34);
}

.study-side-tab {
  min-height: 36px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: color-mix(in srgb, var(--muted-ink) 82%, transparent);
  cursor: pointer;
  font-family: var(--study-cn-font);
  font-size: 14px;
  letter-spacing: 0.08em;
  transition: background 200ms var(--ease), color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.study-side-tab.is-active {
  background: color-mix(in srgb, var(--paper) 96%, #fff);
  color: color-mix(in srgb, var(--vermilion) 42%, var(--ink));
  box-shadow: 0 8px 20px rgba(31, 23, 17, 0.08);
}

.study-question-panel,
.study-vocab-cards {
  display: grid;
  gap: 14px;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.study-question-panel[hidden],
.study-vocab-cards[hidden] {
  display: none;
}

.study-vocab-card {
  scroll-margin-top: 126px;
  padding: 16px 16px 17px;
  border: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  cursor: pointer;
  transition: border-color 240ms var(--ease), background 240ms var(--ease), box-shadow 240ms var(--ease), transform 240ms var(--ease);
}

.study-vocab-card:last-child {
  border-bottom: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
}

.study-vocab-card.is-active {
  border-color: color-mix(in srgb, var(--vermilion) 64%, var(--hairline));
  background: color-mix(in srgb, var(--vermilion) 7%, var(--paper));
  box-shadow: 0 14px 38px rgba(31, 23, 17, 0.1);
  transform: translateX(-3px);
}

.study-question-card {
  padding: 24px 18px 28px;
  border-bottom: 1px solid color-mix(in srgb, var(--hairline) 68%, transparent);
  color: var(--ink);
  font-family: var(--study-en-font), var(--study-cn-font);
  background: color-mix(in srgb, var(--paper) 78%, transparent);
}

.study-question-card:last-child {
  border-bottom: 0;
}

.study-question-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.study-question-title span {
  color: color-mix(in srgb, var(--pine) 86%, #39a993);
  font-size: 25px;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1;
}

.study-question-title em {
  padding: 2px 8px 3px;
  border-radius: 5px;
  background: color-mix(in srgb, #f1c77f 34%, var(--paper));
  color: color-mix(in srgb, #9a6530 84%, var(--ink));
  font-family: var(--study-cn-font);
  font-size: 12px;
  font-style: normal;
  letter-spacing: 0.04em;
}

.study-question-stem {
  margin-bottom: 18px;
  color: color-mix(in srgb, var(--ink) 88%, var(--muted-ink));
  font-size: 18px;
  line-height: 1.82;
  letter-spacing: 0;
}

.study-question-options {
  display: grid;
  gap: 13px;
}

.study-question-option {
  position: relative;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  min-height: 34px;
  padding: 8px 8px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: color-mix(in srgb, var(--ink) 82%, var(--muted-ink));
  cursor: pointer;
  font-size: 17px;
  line-height: 1.72;
  letter-spacing: 0;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), color 180ms var(--ease);
}

.study-question-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.study-question-option-key {
  width: 26px;
  height: 26px;
  display: inline-grid;
  place-items: center;
  margin-top: 2px;
  border: 1px solid color-mix(in srgb, var(--hairline) 84%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  color: color-mix(in srgb, var(--muted-ink) 78%, transparent);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  transition: background 180ms var(--ease), border-color 180ms var(--ease), color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.study-question-option:hover .study-question-option-key,
.study-question-option input:focus-visible + .study-question-option-key {
  border-color: color-mix(in srgb, var(--pine) 52%, var(--hairline));
  color: var(--pine);
}

.study-question-option input:checked + .study-question-option-key {
  border-color: color-mix(in srgb, var(--vermilion) 72%, var(--hairline));
  background: var(--paper);
  color: color-mix(in srgb, var(--ink) 94%, #000);
  font-weight: 900;
  box-shadow: 0 6px 14px color-mix(in srgb, var(--vermilion) 14%, transparent);
}

.study-question-option-text {
  min-width: 0;
}

.study-question-option:has(input:checked) {
  border-color: color-mix(in srgb, var(--vermilion) 68%, var(--hairline));
  background: color-mix(in srgb, var(--vermilion) 6%, var(--paper));
  color: var(--ink);
}

.study-vocab-index {
  margin-bottom: 8px;
  color: var(--vermilion);
  font-family: var(--study-en-font);
  font-size: 13px;
  font-style: italic;
}

.study-vocab-card h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-family: var(--study-en-font), var(--study-cn-font);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0;
}

.study-vocab-card p {
  margin: 0;
  color: var(--muted-ink);
  font-family: var(--study-en-font), var(--study-cn-font);
  font-size: 15px;
  line-height: 1.75;
  letter-spacing: 0;
}

.study-vocab-bank-link {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  margin-top: 12px;
  padding: 0 10px;
  border: 1px solid color-mix(in srgb, var(--pine) 42%, var(--hairline));
  border-radius: 999px;
  background: color-mix(in srgb, var(--pine) 8%, transparent);
  color: var(--pine);
  font-family: var(--study-cn-font);
  font-size: 13px;
  text-decoration: none;
}

.study-vocab-bank-link:hover {
  border-color: var(--pine);
  background: color-mix(in srgb, var(--pine) 13%, transparent);
}

.study-vocab-subhead {
  display: inline-block;
  margin: 8px 0 2px;
  color: var(--ink);
  font-weight: 700;
}

.study-mobile-menu-trigger,
.study-mobile-outline-trigger,
.study-mobile-drawer-backdrop,
.study-mobile-drawer-close {
  display: none;
}

html[data-theme="night"] .study-code-block,
html[data-theme="night"] .study-vocab-card {
  background: rgba(255, 239, 210, 0.055);
}

html[data-theme="night"] .kaoyan-reading-page .study-vocab-panel,
html[data-theme="night"] .study-question-card {
  background: rgba(255, 239, 210, 0.045);
}

html[data-theme="night"] .study-side-tabs {
  border-color: rgba(246, 231, 200, 0.12);
  background: rgba(255, 239, 210, 0.045);
  box-shadow: inset 0 1px 0 rgba(255, 239, 210, 0.05);
}

html[data-theme="night"] .study-side-tab {
  color: color-mix(in srgb, #F6E7C8 58%, transparent);
}

html[data-theme="night"] .study-side-tab.is-active {
  background: rgba(255, 239, 210, 0.1);
  color: #F6E7C8;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.22);
}

html[data-theme="night"] .study-vocab-card.is-active {
  background: rgba(224, 139, 96, 0.13);
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.25);
}

html[data-theme="night"] .study-question-option {
  color: color-mix(in srgb, #F6E7C8 82%, var(--muted-ink));
}

html[data-theme="night"] .study-question-option-key {
  background: rgba(255, 239, 210, 0.055);
  color: color-mix(in srgb, #F6E7C8 72%, transparent);
}

html[data-theme="night"] .study-question-option:has(input:checked) {
  border-color: color-mix(in srgb, #F0A17F 72%, var(--hairline));
  background: rgba(224, 139, 96, 0.14);
  color: #F8EBD4;
}

html[data-theme="night"] .study-question-option input:checked + .study-question-option-key {
  border-color: color-mix(in srgb, #F0A17F 74%, var(--hairline));
  background: rgba(240, 161, 127, 0.2);
  color: #FFF2D9;
}

.study-pdf-export-root {
  display: none;
}

@media print {
  @page {
    size: A4;
    margin: 14mm 13mm;
  }

  html,
  body {
    background: #fff !important;
  }

  body.study-printing-pdf > :not(.study-pdf-export-root) {
    display: none !important;
  }

  body.study-printing-pdf .study-pdf-export-root {
    display: block !important;
    color: #211b18;
    background: #fff;
    font-family: Georgia, "Times New Roman", "Microsoft YaHei", serif;
  }

  .study-pdf-export-head {
    margin: 0 0 18px;
    padding: 0 0 12px;
    border-bottom: 1px solid #e6ddd0;
  }

  .study-pdf-export-head div {
    margin-bottom: 6px;
    color: #b84f43;
    font-size: 10pt;
    letter-spacing: 0.12em;
  }

  .study-pdf-export-head h1 {
    margin: 0;
    color: #16120f;
    font-size: 18pt;
    font-weight: 700;
    letter-spacing: 0;
  }

  .study-pdf-sheet,
  .study-pdf-export-root .study-question-panel {
    display: block !important;
    width: 100%;
    padding: 0 !important;
    border: 0 !important;
    background: #fff !important;
    box-shadow: none !important;
    color: #211b18;
    font-size: 11.2pt;
    line-height: 1.72;
  }

  .study-pdf-sheet p {
    margin: 0 0 12px;
    break-inside: avoid;
  }

  .study-pdf-sheet .study-translation-fold {
    margin: -4px 0 12px;
    border-color: #eadfd2;
    break-inside: avoid;
  }

  .study-pdf-sheet .study-translation-fold:not([open]) .study-translation-body {
    display: none;
  }

  .study-pdf-export-root .study-question-card {
    margin: 14px 0 0;
    padding: 14px 0 16px;
    border-bottom: 1px solid #eadfd2;
    background: transparent !important;
    break-inside: avoid;
  }

  .study-pdf-export-root .study-question-title span {
    color: #111;
    font-size: 17pt;
  }

  .study-pdf-export-root .study-question-stem,
  .study-pdf-export-root .study-question-option {
    font-size: 11.2pt;
    line-height: 1.7;
  }

  .study-pdf-export-root .study-question-option {
    padding: 3px 0;
    border: 0;
    background: transparent !important;
  }

  .study-pdf-export-root .study-question-option-key {
    width: 20px;
    height: 20px;
    color: #555;
    background: #fff;
  }

  .study-user-highlight {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .study-footnote-ref,
  .study-kaoyan-paragraph-label,
  .study-sentence-inline-mark {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}

@media (max-width: 1180px) {
  .study-reader {
    width: min(100% - 16px, 1164px);
  }

  .study-reader-grid {
    grid-template-columns: minmax(240px, 280px) minmax(0, 1fr);
  }

  .study-outline {
    position: static;
    grid-column: 2;
    max-height: calc(100vh - 148px);
    padding: 26px 0 0;
    border-left: 0;
  }

  .study-outline.is-map-open {
    width: auto;
    margin-left: 0;
  }

  .study-outline nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 18px;
  }

  .external-digest-reader-page .study-reader-grid {
    grid-template-columns: minmax(240px, 280px) minmax(0, 1fr);
  }

  .external-digest-reader-page .study-vocab-panel {
    position: static;
    grid-column: 2;
    max-height: calc(100vh - 148px);
    padding: 26px 0 0;
    border-left: 0;
  }

  .external-digest-reader-page {
    --mobile-study-en-font: Georgia, "Times New Roman", Times, serif;
    --mobile-study-cn-font: "LXGW WenKai Mono GB", "霞鹜文楷等宽 GB", "霞鹜文楷等宽GB", "霞骛文楷等宽 GB", "霞骛文楷等宽GB", "LXGW WenKai Mono", "Microsoft YaHei UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
  }

  .external-digest-reader-page .study-reader {
    padding: 98px 18px 82px;
  }

  .external-digest-reader-page .site-header {
    z-index: 1320;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    align-items: start;
    padding: 12px 14px 14px;
    border-bottom: 1px solid var(--hairline);
    background: color-mix(in srgb, var(--paper) 96%, transparent);
    box-shadow: 0 18px 52px rgba(31, 23, 17, 0.18);
    pointer-events: auto;
    transform: translateY(0);
    transition: transform 280ms cubic-bezier(0.22, 0.8, 0.24, 1);
  }

  .external-digest-reader-page.study-mobile-top-open .site-header {
    pointer-events: auto;
    transform: translateY(0);
  }

  .external-digest-reader-page .site-header .brand {
    padding-left: 0;
  }

  .external-digest-reader-page .reading-nav {
    width: 100%;
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    align-items: center;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 4px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .external-digest-reader-page .reading-nav::-webkit-scrollbar {
    display: none;
  }

  .external-digest-reader-page .reading-nav > a,
  .external-digest-reader-page .reading-nav .nav-trigger {
    min-height: 34px;
    display: inline-flex;
    align-items: center;
    padding: 0 10px;
    border: 1px solid var(--hairline);
    border-radius: 999px;
    background: color-mix(in srgb, var(--paper) 78%, transparent);
    color: var(--ink);
  }

  .external-digest-reader-page .reading-nav .nav-dropdown {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .external-digest-reader-page .reading-nav .reading-nav-menu {
    position: static;
    min-width: 0;
    display: flex;
    flex: 0 0 auto;
    flex-wrap: nowrap;
    gap: 8px;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .external-digest-reader-page .reading-nav .reading-nav-menu a {
    flex: 0 0 auto;
    min-height: 30px;
    padding: 0 9px;
    border: 1px solid color-mix(in srgb, var(--hairline) 78%, transparent);
    border-radius: 999px;
    background: color-mix(in srgb, var(--paper) 64%, transparent);
    font-size: 12px;
  }

  .external-digest-reader-page .study-reader-head {
    margin-bottom: 24px;
  }

  .external-digest-reader-page .study-reader-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .external-digest-reader-page .study-sheet {
    grid-column: 1;
    width: 100%;
    font-size: 17px;
    line-height: 1.72;
  }

  .external-digest-reader-page .study-sheet,
  .external-digest-reader-page .study-sheet p,
  .external-digest-reader-page .study-digest-lead-en,
  .external-digest-reader-page .study-digest-lead-zh,
  .external-digest-reader-page .study-translation-body,
  .external-digest-reader-page .study-vocab-card,
  .external-digest-reader-page .study-vocab-card h3,
  .external-digest-reader-page .study-vocab-card p {
    font-family: var(--mobile-study-en-font), var(--mobile-study-cn-font);
    letter-spacing: 0;
    word-spacing: normal;
    word-break: normal;
    overflow-wrap: break-word;
  }

  .external-digest-reader-page .study-sheet p {
    margin-bottom: 20px;
    text-align: left;
    text-wrap: pretty;
  }

  .external-digest-reader-page .study-sheet > p:first-of-type {
    margin-bottom: 14px;
    font-size: clamp(22px, 6vw, 30px);
    line-height: 1.32;
  }

  .kaoyan-reading-page .study-sheet > p:first-of-type {
    margin-bottom: 20px;
    font-size: 17px;
    line-height: 1.72;
  }

  .external-digest-reader-page .study-digest-lead-en,
  .external-digest-reader-page .study-digest-lead-zh {
    font-size: 16px;
  }

  .external-digest-reader-page .study-digest-lead-en {
    margin-bottom: 8px;
    line-height: 1.68;
  }

  .external-digest-reader-page .study-digest-lead-zh {
    margin-bottom: 24px;
    padding: 0 0 14px 14px;
    font-size: 16px;
    line-height: 1.76;
  }

  .external-digest-reader-page .study-translation-fold {
    margin: -4px 0 22px;
  }

  .external-digest-reader-page .study-translation-fold summary {
    font-size: 14px;
  }

  .external-digest-reader-page .study-translation-body {
    padding: 13px 15px 14px;
    font-size: 15px;
    line-height: 1.78;
  }

  .external-digest-reader-page .study-vocab-card h3 {
    font-size: 19px;
  }

  .external-digest-reader-page .study-vocab-card p {
    font-size: 14px;
    line-height: 1.68;
  }

  .external-digest-reader-page .study-note-menu,
  .external-digest-reader-page .study-vocab-panel {
    position: fixed;
    z-index: 1300;
    top: 0;
    bottom: 0;
    width: min(86vw, 360px);
    max-height: none;
    padding: 26px 18px 34px;
    overflow-x: hidden;
    overflow-y: auto;
    border-top: 0;
    background: var(--paper);
    box-shadow: 0 18px 52px rgba(31, 23, 17, 0.2);
    transition: transform 280ms cubic-bezier(0.22, 0.8, 0.24, 1), visibility 280ms step-end;
    will-change: transform;
  }

  .external-digest-reader-page .study-note-menu {
    left: 0;
    border-right: 1px solid var(--hairline);
    transform: translateX(-104%);
  }

  .external-digest-reader-page .study-vocab-panel {
    right: 0;
    border-left: 1px solid var(--hairline);
    transform: translateX(104%);
  }

  .study-mobile-menu-open .study-note-menu,
  .study-mobile-vocab-open .study-vocab-panel {
    transform: translateX(0);
    transition: transform 280ms cubic-bezier(0.22, 0.8, 0.24, 1), visibility 0ms;
  }

  .study-mobile-menu-trigger {
    display: none;
  }

  .study-mobile-drawer-backdrop {
    position: fixed;
    z-index: 1200;
    inset: 0;
    display: block;
    border: 0;
    background: rgba(31, 23, 17, 0.24);
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease;
  }

  .study-mobile-menu-open .study-mobile-drawer-backdrop,
  .study-mobile-top-open .study-mobile-drawer-backdrop,
  .study-mobile-vocab-open .study-mobile-drawer-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .study-mobile-menu-open,
  .study-mobile-top-open,
  .study-mobile-vocab-open {
    overflow: hidden;
  }

  .external-digest-reader-page .study-note-menu h2,
  .external-digest-reader-page .study-vocab-panel h2 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
  }

  .study-mobile-drawer-close {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border: 1px solid var(--hairline);
    border-radius: 999px;
    background: transparent;
    color: var(--vermilion);
    font-size: 22px;
    line-height: 1;
  }

  .jianzao-reader-page {
    --mobile-study-cn-font: "LXGW WenKai Mono GB", "霞鹜文楷等宽 GB", "霞鹜文楷等宽GB", "霞骛文楷等宽 GB", "霞骛文楷等宽GB", "LXGW WenKai Mono", "Microsoft YaHei UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
  }

  .jianzao-reader-page .study-reader {
    width: auto;
    padding: 98px 18px 92px;
  }

  .jianzao-reader-page .study-reader-head {
    display: grid;
    gap: 18px;
    margin-bottom: 24px;
    padding-bottom: 24px;
  }

  .jianzao-reader-page .study-reader-head .crumb {
    margin-bottom: 14px;
    font-size: 12px;
    line-height: 1.9;
    letter-spacing: 0.12em;
  }

  .jianzao-reader-page .study-reader-head h1 {
    margin-bottom: 0;
    font-size: clamp(28px, 6vw, 42px);
    line-height: 1.25;
    letter-spacing: 0.08em;
  }

  .jianzao-reader-page .study-reader-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .jianzao-reader-page .study-sheet {
    grid-column: 1;
    width: 100%;
    padding: clamp(24px, 4.8vw, 42px);
    font-family: var(--mobile-study-cn-font);
    font-size: 17px;
    line-height: 1.86;
    word-break: normal;
    overflow-wrap: break-word;
  }

  .jianzao-reader-page .study-sheet p,
  .jianzao-reader-page .study-sheet li,
  .jianzao-reader-page .study-sheet td,
  .jianzao-reader-page .study-sheet th {
    letter-spacing: 0;
    word-spacing: normal;
    word-break: normal;
    overflow-wrap: break-word;
  }

  .jianzao-reader-page .study-sheet h1 {
    font-size: clamp(25px, 5.6vw, 36px);
    line-height: 1.38;
  }

  .jianzao-reader-page .study-sheet h2 {
    margin-top: 42px;
    font-size: clamp(22px, 4.7vw, 28px);
    line-height: 1.42;
  }

  .jianzao-reader-page .study-sheet h3 {
    margin-top: 32px;
    font-size: clamp(19px, 4vw, 23px);
    line-height: 1.46;
  }

  .jianzao-reader-page .study-note-menu,
  .jianzao-reader-page .study-outline {
    position: fixed;
    z-index: 1300;
    top: 0;
    bottom: 0;
    width: min(86vw, 360px);
    max-height: none;
    padding: 26px 18px 34px;
    overflow-x: hidden;
    overflow-y: auto;
    border-top: 0;
    background: var(--paper);
    box-shadow: 0 18px 52px rgba(31, 23, 17, 0.2);
    transition: transform 280ms cubic-bezier(0.22, 0.8, 0.24, 1), visibility 280ms step-end;
    will-change: transform;
  }

  .jianzao-reader-page .study-note-menu {
    left: 0;
    border-right: 1px solid var(--hairline);
    border-radius: 0 18px 18px 0;
    transform: translateX(-104%);
  }

  .jianzao-reader-page .study-outline {
    right: 0;
    order: initial;
    border-left: 1px solid var(--hairline);
    border-radius: 18px 0 0 18px;
    transform: translateX(104%);
  }

  .jianzao-reader-page .study-outline.is-map-open {
    width: min(86vw, 360px);
    margin-left: 0;
    padding: 26px 18px 34px;
  }

  .jianzao-reader-page .study-note-menu nav,
  .jianzao-reader-page .study-outline nav {
    grid-template-columns: minmax(0, 1fr);
  }

  .study-mobile-menu-open .jianzao-reader-page .study-note-menu,
  .study-mobile-outline-open .jianzao-reader-page .study-outline {
    transform: translateX(0);
    transition: transform 280ms cubic-bezier(0.22, 0.8, 0.24, 1), visibility 0ms;
  }

  .jianzao-reader-page.study-mobile-menu-open .study-note-menu,
  .jianzao-reader-page.study-mobile-outline-open .study-outline {
    transform: translateX(0);
    transition: transform 280ms cubic-bezier(0.22, 0.8, 0.24, 1), visibility 0ms;
  }

  .study-mobile-outline-trigger {
    position: fixed;
    z-index: 1250;
    right: 16px;
    bottom: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 68px;
    height: 42px;
    padding: 0 16px;
    border: 1px solid color-mix(in srgb, var(--vermilion) 52%, var(--hairline));
    border-radius: 999px;
    background: color-mix(in srgb, var(--paper) 92%, transparent);
    color: var(--vermilion);
    box-shadow: 0 14px 34px rgba(31, 23, 17, 0.14);
    font-family: var(--study-cn-font);
    font-size: 14px;
    letter-spacing: 0.12em;
  }

  .jianzao-reader-page.study-mobile-menu-open .study-mobile-drawer-backdrop,
  .jianzao-reader-page.study-mobile-outline-open .study-mobile-drawer-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .jianzao-reader-page.study-mobile-menu-open,
  .jianzao-reader-page.study-mobile-outline-open {
    overflow: hidden;
  }

  .jianzao-reader-page .study-outline-head {
    align-items: center;
  }

  .jianzao-reader-page .study-note-menu h2 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
  }

  .jianzao-reader-page .answer-toggle {
    left: auto;
    right: 16px;
    bottom: 72px;
    min-width: 104px;
    height: 40px;
    border-radius: 999px;
    font-size: 13px;
  }
}

@media (max-width: 900px) {
  .study-reader {
    width: auto;
    padding: 112px 28px 80px;
  }

  .study-reader-head {
    display: grid;
    gap: 24px;
    margin-bottom: 34px;
    padding-bottom: 28px;
  }

  .study-reader-head .crumb {
    line-height: 2;
    letter-spacing: 0.15em;
  }

  .study-reader-head h1 {
    font-size: 36px;
    letter-spacing: 0.1em;
  }

  .study-reader-grid {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .answer-toggle {
    left: auto;
    right: 20px;
    bottom: 20px;
    min-width: 120px;
    height: 44px;
  }

  .study-note-menu,
  .study-outline,
  .study-vocab-panel {
    position: static;
    grid-column: auto;
  }

  .study-note-menu {
    padding-top: 24px;
    max-height: min(60vh, 520px);
    overflow-x: hidden;
    overflow-y: auto;
  }

  .study-note-menu nav,
  .study-outline nav {
    grid-template-columns: 1fr;
  }

  .study-outline {
    order: 2;
    padding: 24px 0 0;
    max-height: min(60vh, 520px);
    overflow-x: hidden;
    overflow-y: auto;
    border-left: 0;
  }

  .external-digest-reader-page .study-vocab-panel {
    order: 3;
    padding: 24px 0 0;
    max-height: min(60vh, 520px);
    border-left: 0;
  }

  .external-digest-reader-page .study-reader {
    padding: 98px 18px 82px;
  }

  .external-digest-reader-page .study-reader-head {
    margin-bottom: 24px;
  }

  .external-digest-reader-page .study-reader-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .external-digest-reader-page .study-sheet {
    grid-column: 1;
    width: 100%;
  }

  .external-digest-reader-page .study-note-menu,
  .external-digest-reader-page .study-vocab-panel {
    position: fixed;
    z-index: 1300;
    top: 0;
    bottom: 0;
    width: min(86vw, 360px);
    max-height: none;
    padding: 26px 18px 34px;
    overflow-x: hidden;
    overflow-y: auto;
    border-top: 0;
    background: var(--paper);
    box-shadow: 0 18px 52px rgba(31, 23, 17, 0.2);
    transition: transform 280ms cubic-bezier(0.22, 0.8, 0.24, 1), visibility 280ms step-end;
    will-change: transform;
  }

  .external-digest-reader-page .study-note-menu {
    left: 0;
    border-right: 1px solid var(--hairline);
    transform: translateX(-104%);
  }

  .external-digest-reader-page .study-vocab-panel {
    right: 0;
    border-left: 1px solid var(--hairline);
    transform: translateX(104%);
  }

  .study-mobile-menu-open .study-note-menu,
  .study-mobile-vocab-open .study-vocab-panel {
    transform: translateX(0);
    transition: transform 280ms cubic-bezier(0.22, 0.8, 0.24, 1), visibility 0ms;
  }

  .study-mobile-menu-trigger {
    display: none;
  }

  .study-mobile-drawer-backdrop {
    position: fixed;
    z-index: 1200;
    inset: 0;
    display: block;
    border: 0;
    background: rgba(31, 23, 17, 0.24);
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease;
  }

  .study-mobile-menu-open .study-mobile-drawer-backdrop,
  .study-mobile-vocab-open .study-mobile-drawer-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .study-mobile-menu-open,
  .study-mobile-vocab-open {
    overflow: hidden;
  }

  .study-note-menu h2,
  .study-vocab-panel h2 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
  }

  .study-mobile-drawer-close {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border: 1px solid var(--hairline);
    border-radius: 999px;
    background: transparent;
    color: var(--vermilion);
    font-size: 22px;
    line-height: 1;
  }

  .external-digest-reader-page {
    --mobile-study-en-font: Georgia, "Times New Roman", Times, serif;
    --mobile-study-cn-font: "LXGW WenKai Mono GB", "霞鹜文楷等宽 GB", "霞鹜文楷等宽GB", "霞骛文楷等宽 GB", "霞骛文楷等宽GB", "LXGW WenKai Mono", "Microsoft YaHei UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
  }

  .external-digest-reader-page .study-sheet,
  .external-digest-reader-page .study-sheet p,
  .external-digest-reader-page .study-digest-lead-en,
  .external-digest-reader-page .study-digest-lead-zh,
  .external-digest-reader-page .study-translation-body,
  .external-digest-reader-page .study-vocab-card,
  .external-digest-reader-page .study-vocab-card h3,
  .external-digest-reader-page .study-vocab-card p {
    font-family: var(--mobile-study-en-font), var(--mobile-study-cn-font);
    letter-spacing: 0;
    word-spacing: normal;
    word-break: normal;
    overflow-wrap: break-word;
  }

  .external-digest-reader-page .study-sheet {
    font-size: 17px;
    line-height: 1.72;
  }

  .external-digest-reader-page .study-sheet p {
    margin-bottom: 20px;
    text-align: left;
    text-wrap: pretty;
  }

  .external-digest-reader-page .study-sheet > p:first-of-type {
    margin-bottom: 14px;
    font-size: clamp(22px, 6vw, 30px);
    line-height: 1.32;
  }

  .kaoyan-reading-page .study-sheet > p:first-of-type {
    margin-bottom: 20px;
    font-size: 17px;
    line-height: 1.72;
  }

  .external-digest-reader-page .study-digest-lead-en,
  .external-digest-reader-page .study-digest-lead-zh {
    font-size: 16px;
  }

  .external-digest-reader-page .study-digest-lead-en {
    margin-bottom: 8px;
    line-height: 1.68;
  }

  .external-digest-reader-page .study-digest-lead-zh {
    margin-bottom: 24px;
    padding: 0 0 14px 14px;
    font-size: 16px;
    line-height: 1.76;
  }

  .external-digest-reader-page .study-translation-fold {
    margin: -4px 0 22px;
  }

  .external-digest-reader-page .study-translation-fold summary {
    font-size: 14px;
  }

  .external-digest-reader-page .study-translation-body {
    padding: 13px 15px 14px;
    font-size: 15px;
    line-height: 1.78;
  }

  .external-digest-reader-page .study-vocab-card h3 {
    font-size: 19px;
  }

  .external-digest-reader-page .study-vocab-card p {
    font-size: 14px;
    line-height: 1.68;
  }

  .study-map-modal {
    padding: 8px;
  }

  .study-map-panel {
    width: calc(100vw - 16px);
    height: calc(100vh - 16px);
    min-width: 0;
  }

  .study-map-head {
    min-height: 78px;
    padding: 22px 22px 16px;
    display: grid;
    gap: 14px;
  }

  .study-map-head h2 {
    font-size: 23px;
  }

  .study-map-actions {
    justify-content: flex-start;
    max-width: none;
  }

  .study-map-search {
    width: min(100%, 240px);
  }

  .study-map-search input {
    width: 100%;
  }

  .study-map-scroll {
    padding: 28px 22px 58px;
  }

  .study-map-root {
    min-width: max-content;
  }

  .study-map-canvas {
    grid-template-columns: auto minmax(620px, 1fr);
    gap: 44px;
  }

  .study-map-root-label {
    max-width: 170px;
    font-size: 15px;
  }

  .study-map-branches {
    gap: 16px;
  }

  .study-map-branches-right::before {
    left: -22px;
  }

  .study-map-branches-right > .study-map-item::before {
    left: -22px;
  }

  .study-map-item::before {
    width: 24px;
  }

  .study-map-label {
    max-width: 280px;
    font-size: 13px;
  }

  .study-map-children {
    margin-left: 58px;
  }

  .study-map-children::before,
  .study-map-children .study-map-item::before {
    left: -30px;
  }

  .study-map-children .study-map-item::before {
    width: 30px;
  }

  .study-sheet {
    padding: 28px 20px 40px;
    font-size: 19px;
    line-height: 1.84;
    letter-spacing: 0;
  }

  .study-sheet h1 {
    font-size: 28px;
  }

  .study-sheet h2 {
    font-size: 23px;
  }

  .study-sheet h3 {
    font-size: 19px;
  }
}

@media (max-width: 640px) {
  .external-digest-reader-page .site-header {
    min-height: 0;
    gap: 8px;
    padding: 10px 12px 12px;
  }

  .external-digest-reader-page .site-header .brand {
    font-size: 16px;
    line-height: 1.2;
    letter-spacing: 0.28em;
  }

  .external-digest-reader-page .reading-nav {
    display: flex;
    flex-wrap: nowrap;
    gap: 7px;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0 0 3px;
    scrollbar-width: none;
  }

  .external-digest-reader-page .reading-nav::-webkit-scrollbar {
    display: none;
  }

  .external-digest-reader-page .reading-nav .nav-dropdown,
  .external-digest-reader-page .reading-nav .reading-nav-menu {
    display: flex;
    flex: 0 0 auto;
    flex-wrap: nowrap;
    gap: 7px;
  }

  .external-digest-reader-page .reading-nav .reading-nav-menu {
    display: none;
  }

  .external-digest-reader-page .reading-nav > a,
  .external-digest-reader-page .reading-nav .nav-trigger,
  .external-digest-reader-page .reading-nav .reading-nav-menu a {
    flex: 0 0 auto;
    min-height: 28px;
    padding: 0 9px;
    font-size: 12px;
    line-height: 1;
    white-space: nowrap;
  }

  .external-digest-reader-page .study-reader {
    width: 100%;
    padding: 118px 10px 70px;
  }

  .external-digest-reader-page .study-reader-head {
    margin-bottom: 14px;
    padding-bottom: 16px;
  }

  .external-digest-reader-page .study-reader-head .crumb {
    margin-bottom: 8px;
    font-size: 11px;
    letter-spacing: 0.08em;
  }

  .external-digest-reader-page .study-reader-head h1 {
    margin-bottom: 0;
    font-size: 26px;
    letter-spacing: 0.05em;
  }

  .external-digest-reader-page .study-sheet {
    width: 100%;
    padding: 22px 14px 36px;
    font-size: 16px;
    line-height: 1.72;
    overflow-wrap: break-word;
    word-break: normal;
  }

  .external-digest-reader-page .study-sheet p,
  .external-digest-reader-page .study-digest-lead-en,
  .external-digest-reader-page .study-digest-lead-zh {
    margin-bottom: 16px;
    font-size: 16px;
    line-height: 1.72;
  }

  .external-digest-reader-page .study-sheet > p:first-of-type {
    font-size: clamp(20px, 6.4vw, 25px);
    line-height: 1.34;
  }

  .external-digest-reader-page .study-footnote-ref {
    padding-inline: 0.08em;
  }

  .study-kaoyan-paragraph-label {
    margin-right: 0.35em;
  }

  .study-sentence-inline-mark {
    margin-right: 0.12em;
  }
}