.reader-wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 46px 44px 55px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 184px;
  gap: 50px;
  align-items: start;
}
.article-column {
  min-width: 0;
  max-width: 850px;
}
.article-header {
  padding-bottom: 29px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}
.article-kicker {
  display: flex;
  gap: 13px;
  align-items: center;
  margin-bottom: 17px;
}
.article-kicker .section-kicker {
  margin: 0;
}
.article-unit-count {
  font-size: 10px;
  color: var(--muted);
}
.article-header h1 {
  font-size: clamp(28px, 2.9vw, 40px);
  font-weight: 590;
  letter-spacing: -1px;
  line-height: 1.5;
  overflow-wrap: anywhere;
}
.article-deck {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.9;
  margin-top: 16px;
}
.article-actions {
  display: flex;
  gap: 19px;
  align-items: center;
  margin-top: 22px;
  flex-wrap: wrap;
}
.article-actions a,
.article-save {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 10px;
}
.article-save {
  background: none;
  border: 0;
  padding: 0;
}
.article-save[aria-pressed="true"] {
  color: var(--accent);
}
.article-actions a:hover {
  color: var(--accent);
}
.article-toc {
  position: sticky;
  top: 111px;
  max-height: calc(100vh - 145px);
  overflow-y: auto;
  padding: 0 0 5px;
}
.toc-title {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.7px;
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 15px;
}
.article-toc nav {
  border-left: 1px solid var(--border);
  padding-left: 0;
}
.toc-link {
  font-size: 11px;
  line-height: 1.6;
  display: block;
  color: var(--muted);
  padding: 6px 0 6px 14px;
  border-left: 2px solid transparent;
  margin-left: -1px;
}
.toc-link:hover {
  color: var(--ink);
}
.toc-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 500;
}
.toc-sub {
  padding-left: 24px;
  font-size: 10px;
}
.toc-source {
  display: flex;
  align-items: center;
  gap: 6px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
  margin-top: 23px;
  color: var(--muted);
  font-size: 10px;
}
.markdown {
  font-size: 13px;
  line-height: 2;
  overflow-wrap: break-word;
  color: var(--ink);
}
.markdown > p {
  margin: 17px 0;
}
.markdown > p:first-child {
  font-size: 14px;
  color: var(--muted);
  line-height: 2.05;
}
.markdown h2 {
  font-size: 22px;
  font-weight: 570;
  margin: 48px 0 18px;
  line-height: 1.6;
  letter-spacing: -0.5px;
  scroll-margin-top: 90px;
}
.markdown h3 {
  font-size: 17px;
  line-height: 1.7;
  font-weight: 580;
  margin: 35px 0 17px;
  scroll-margin-top: 90px;
}
.markdown h4 {
  font-size: 14px;
  margin: 25px 0 12px;
}
.markdown a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: #6683d657;
  text-underline-offset: 3px;
  overflow-wrap: anywhere;
}
.markdown a:hover {
  text-decoration-color: currentColor;
}
.markdown strong {
  font-weight: 620;
}
.markdown ul,
.markdown ol {
  padding-left: 22px;
  margin: 17px 0;
}
.markdown li {
  padding-left: 3px;
  margin: 8px 0;
}
.markdown li > p {
  margin: 6px 0;
}
.markdown blockquote {
  border-left: 3px solid var(--accent);
  padding: 15px 20px;
  margin: 24px 0;
  background: var(--accent-soft);
  border-radius: 0 8px 8px 0;
  color: var(--muted);
}
.markdown blockquote p {
  margin: 0;
}
.markdown hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 35px 0;
}
.markdown code:not(pre code) {
  font-size: 0.88em;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--surface-soft);
  color: var(--ink);
  overflow-wrap: anywhere;
}
.markdown pre {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  line-height: 1.85;
  margin: 0;
  padding: 38px 19px 20px;
  overflow-x: auto;
  max-width: 100%;
  border-radius: 9px;
  background: var(--surface) !important;
}
.code-block {
  position: relative;
  margin: 24px 0;
  border: 1px solid var(--border);
  border-radius: 9px;
  overflow: hidden;
  background: var(--surface);
}
.code-block::before {
  position: absolute;
  top: 10px;
  left: 18px;
  content: attr(data-language);
  text-transform: uppercase;
  font:
    8px ui-monospace,
    monospace;
  letter-spacing: 1px;
  color: var(--muted);
}
.copy-code {
  position: absolute;
  right: 10px;
  top: 7px;
  font-size: 9px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 4px;
  color: var(--muted);
}
.copy-code:hover {
  color: var(--accent);
}
.shiki,
.shiki span {
  color: var(--shiki-light);
}
[data-theme="dark"] .shiki,
[data-theme="dark"] .shiki span {
  color: var(--shiki-dark);
}
.markdown table {
  display: block;
  max-width: 100%;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 11px;
  margin: 25px 0;
  line-height: 1.8;
}
.markdown th {
  background: var(--surface-soft);
  font-weight: 550;
  color: var(--ink);
  text-align: left;
}
.markdown td,
.markdown th {
  border: 1px solid var(--border);
  padding: 12px 14px;
  min-width: 130px;
  vertical-align: top;
}
.markdown td {
  background: var(--surface);
}
.markdown img {
  max-width: 100%;
  height: auto;
  margin: 20px 0;
  border-radius: 8px;
}
.markdown .katex {
  font-size: 1.12em;
}
.markdown .katex-display {
  overflow: auto;
  max-width: 100%;
  padding: 20px 16px;
  margin: 26px 0;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 9px;
  text-align: center;
}
.markdown .katex-display > .katex {
  white-space: nowrap;
}
.diagram-frame {
  margin: 27px 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 15px;
  background: var(--surface);
  overflow: hidden;
}
.diagram-label {
  font-size: 9px;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.diagram-canvas {
  overflow-x: auto;
  min-height: 130px;
  display: grid;
  align-items: center;
}
.diagram-canvas svg {
  display: block;
  min-width: 320px;
  width: 100%;
  height: auto;
  margin: auto;
}
.diagram-source {
  margin-top: 13px;
  font-size: 10px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 9px;
}
.diagram-source summary {
  cursor: pointer;
}
.diagram-source pre {
  padding: 14px 8px;
  font-size: 10px;
}
.diagram-loading {
  color: var(--muted);
  font-size: 11px;
  padding: 30px;
  text-align: center;
}
.mermaid-source {
  border: 1px solid var(--border);
  margin: 20px 0 !important;
}
.diagram-error {
  font-size: 11px;
  color: var(--muted);
  padding: 15px;
}
[data-theme="dark"] .diagram-canvas svg {
  filter: invert(0.87) hue-rotate(180deg);
}
.mobile-toc {
  display: none;
}
.article-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin-top: 38px;
}
.article-pagination a {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
  min-width: 0;
}
.article-pagination a:hover {
  border-color: var(--accent);
}
.article-pagination a > span {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 10px;
  margin-bottom: 8px;
}
.article-pagination strong {
  font-size: 12px;
  font-weight: 500;
  display: block;
  line-height: 1.8;
}
.article-pagination .next {
  text-align: right;
}
.article-pagination .next > span {
  justify-content: flex-end;
}
.reading-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 36px 0 12px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.9;
}
.reading-note .status-dot {
  margin-top: 7px;
  flex-shrink: 0;
}
.article-contribute {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  margin-top: 35px;
  font-size: 10px;
  color: var(--muted);
}
.article-contribute a {
  color: var(--accent);
}
.module-goals {
  padding: 21px 25px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 32px;
  font-size: 11px;
  color: var(--muted);
}
.module-goals > strong {
  font-size: 11px;
  font-weight: 550;
  color: var(--ink);
}
.module-goals > div {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 20px;
  margin: 15px 0;
}
.module-goals > div > span::before {
  content: "↳";
  margin-right: 7px;
  color: var(--accent);
}
.module-goals > a {
  color: var(--accent);
  font-size: 10px;
}
@media (min-width: 1550px) {
  .reader-wrap {
    gap: 70px;
    padding-top: 52px;
  }
  .markdown {
    font-size: 14px;
  }
}
@media (max-width: 1250px) {
  .reader-wrap {
    padding: 38px 32px 50px;
    gap: 30px;
    grid-template-columns: minmax(0, 1fr) 160px;
  }
  .article-toc {
    width: 160px;
  }
  .toc-link {
    font-size: 10px;
  }
  .toc-sub {
    font-size: 9px;
  }
}
@media (max-width: 1050px) {
  .reader-wrap {
    padding-left: 40px;
    padding-right: 40px;
    grid-template-columns: minmax(0, 1fr) 170px;
    gap: 35px;
  }
  .article-toc {
    top: 95px;
  }
}
@media (max-width: 760px) {
  .reader-wrap {
    display: block;
    padding: 31px 24px 42px;
  }
  .article-toc {
    display: none;
  }
  .article-header h1 {
    font-size: 29px;
    line-height: 1.6;
  }
  .article-header {
    margin-bottom: 22px;
  }
  .article-actions {
    gap: 17px;
  }
  .markdown {
    font-size: 13px;
  }
  .markdown h2 {
    font-size: 21px;
    margin-top: 35px;
  }
  .markdown h3 {
    font-size: 17px;
  }
  .markdown pre {
    font-size: 10px;
    padding-left: 14px;
    padding-right: 14px;
  }
  .markdown table {
    font-size: 11px;
  }
  .markdown td,
  .markdown th {
    padding: 10px;
    min-width: 110px;
  }
  .markdown .katex-display {
    padding: 14px 7px;
    font-size: 11px;
  }
  .mobile-toc {
    display: block;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    padding: 12px 15px;
    margin: 0 0 25px;
    font-size: 11px;
    color: var(--muted);
  }
  .mobile-toc > summary {
    cursor: pointer;
    color: var(--ink);
  }
  .mobile-toc > div {
    display: grid;
    gap: 8px;
    padding: 15px 0 3px;
  }
  .mobile-toc a:hover {
    color: var(--accent);
  }
  .article-contribute {
    display: block;
    line-height: 2.1;
  }
  .article-contribute a {
    display: block;
  }
  .article-pagination {
    gap: 10px;
  }
  .article-pagination a {
    padding: 13px;
  }
  .module-goals > div {
    grid-template-columns: 1fr;
  }
  .module-goals {
    padding: 18px;
  }
  .diagram-frame {
    padding: 12px;
  }
  .diagram-canvas svg {
    min-width: 400px;
  }
  .article-unit-count {
    font-size: 9px;
  }
}
.markdown {
  font-size: 16px;
  line-height: 1.95;
}
.markdown > p:first-child {
  font-size: 16px;
}
.markdown h2 {
  font-size: 24px;
}
.markdown h3 {
  font-size: 19px;
}
.markdown pre {
  font-size: 13px;
  line-height: 1.85;
}
.markdown table {
  font-size: 13px;
}
.toc-link {
  font-size: 12px;
}
.toc-sub {
  font-size: 11px;
}
.article-actions a,
.article-save {
  font-size: 12px;
}
.article-contribute,
.reading-note {
  font-size: 12px;
}
.copy-code {
  font-size: 11px;
  min-height: 27px;
}
@media (max-width: 760px) {
  .markdown {
    font-size: 16px;
    line-height: 1.95;
  }
  .markdown pre {
    font-size: 12px;
  }
  .markdown table {
    font-size: 12px;
  }
  .markdown .katex-display {
    font-size: 13px;
  }
  .article-header h1 {
    font-size: 29px;
  }
  .article-actions a,
  .article-save {
    font-size: 11px;
  }
  .article-contribute,
  .reading-note {
    font-size: 11px;
  }
  .mobile-toc {
    font-size: 13px;
    padding: 14px 15px;
  }
}
:root {
  --bg: #f8f9f6;
  --surface: #fff;
  --surface-soft: #f1f3ed;
  --ink: #202824;
  --muted: #768078;
  --border: #e1e5dd;
  --accent: #3158d4;
  --accent-soft: #edf1ff;
  --sidebar: #f5f6f2;
  --shadow: 0 10px 30px #20282408;
  --radius: 14px;
  color-scheme: light;
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Noto Sans CJK SC",
    "Microsoft YaHei",
    sans-serif;
  font-synthesis: none;
}
:root[data-theme="dark"] {
  --bg: #151a18;
  --surface: #1c221f;
  --surface-soft: #252d28;
  --ink: #e6ece7;
  --muted: #9ba99f;
  --border: #333c35;
  --accent: #92aaff;
  --accent-soft: #252f4a;
  --sidebar: #171d19;
  --shadow: 0 12px 32px #0002;
  color-scheme: dark;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.6;
}
button,
input,
select {
  font: inherit;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  color: inherit;
}
button:disabled {
  cursor: wait;
}
svg {
  flex-shrink: 0;
  vertical-align: middle;
}
h1,
h2,
h3,
p {
  margin: 0;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}
::selection {
  background: #bfcdfa;
  color: #182346;
}
[hidden] {
  display: none !important;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}
.skip-link {
  position: fixed;
  top: -80px;
  left: 250px;
  z-index: 100;
  background: var(--accent);
  color: white;
  padding: 10px 20px;
  border-radius: 8px;
}
.skip-link:focus {
  top: 10px;
}
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 236px;
  padding: 29px 18px 18px;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  z-index: 40;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 10px;
  font-size: 18px;
  letter-spacing: -0.5px;
  font-weight: 680;
  line-height: 1.3;
}
.brand svg {
  color: var(--accent);
}
.brand-sub {
  display: block;
  font-size: 10px;
  letter-spacing: 3px;
  font-weight: 600;
  margin-top: 4px;
  color: var(--muted);
}
.sidebar-edition {
  margin: 22px 10px 26px;
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10px;
  color: var(--muted);
}
.status-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #64a67e;
  box-shadow: 0 0 0 3px #64a67e14;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 11px;
  min-height: 40px;
  border-radius: 7px;
  padding: 9px 11px;
  color: var(--muted);
  font-size: 12px;
  transition:
    background 0.15s,
    color 0.15s;
}
.nav-link:hover {
  background: var(--surface-soft);
  color: var(--ink);
}
.nav-link.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}
.primary-nav {
  display: grid;
  gap: 4px;
}
.active-pip {
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
  margin-left: auto;
}
.nav-label {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1.5px;
  margin: 29px 11px 10px;
}
.module-nav {
  display: grid;
  gap: 2px;
}
.nav-count {
  font:
    11px ui-monospace,
    SFMono-Regular,
    Consolas,
    monospace;
  margin-left: auto;
  opacity: 0.55;
}
.module-symbol {
  display: inline-flex;
}
.sidebar-footer {
  margin-top: auto;
  padding: 25px 8px 4px;
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 11px;
}
.sidebar-footer strong {
  display: block;
  font-size: 11px;
  font-weight: 550;
}
.sidebar-footer small {
  display: block;
  font-size: 9px;
  color: var(--muted);
  margin-top: 3px;
}
.contributor-symbol {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px dashed var(--border);
  border-radius: 8px;
  font-size: 22px;
  color: var(--muted);
}
.sidebar-footer > svg {
  margin-left: auto;
  color: var(--muted);
}
.workspace {
  margin-left: 236px;
}
.topbar {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 0 44px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 30;
}
.breadcrumb {
  display: flex;
  gap: 12px;
  font-size: 11px;
  color: var(--muted);
  align-items: center;
  min-width: 0;
}
.breadcrumb strong {
  color: var(--ink);
  font-weight: 500;
  max-width: 340px;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 13px;
}
.search-trigger {
  height: 33px;
  min-width: 213px;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  color: var(--muted);
  padding: 0 10px;
  font-size: 11px;
}
.search-trigger kbd {
  margin-left: auto;
  font: 10px inherit;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0 4px;
  border-radius: 3px;
}
.icon-button {
  width: 30px;
  height: 30px;
  border: 0;
  display: grid;
  place-items: center;
  background: none;
  color: var(--muted);
  border-radius: 5px;
}
.icon-button:hover {
  background: var(--surface-soft);
  color: var(--ink);
}
.language-button {
  border: 0;
  background: transparent;
  font:
    11px ui-monospace,
    monospace;
  padding: 6px;
  color: var(--muted);
}
.github-button {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  padding-left: 14px;
  border-left: 1px solid var(--border);
}
.mobile-menu,
.sidebar-backdrop {
  display: none;
}
.moon-icon {
  display: none;
}
[data-theme="dark"] .sun-icon {
  display: none;
}
[data-theme="dark"] .moon-icon {
  display: block;
}
.content-wrap {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 50px;
}
.page-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--border);
  padding: 28px 50px;
  font-size: 10px;
  color: var(--muted);
}
.page-footer > div {
  display: flex;
  gap: 22px;
}
.footer-dot {
  margin: 0 10px;
}
.page-footer a:hover {
  color: var(--accent);
}
.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 55px;
  padding: 67px 0 50px;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 1.2px;
}
.eyebrow-line {
  width: 19px;
  height: 1px;
  background: var(--accent);
}
.hero-title {
  font-family:
    "Songti SC", "Noto Serif CJK SC", "Noto Serif SC", Georgia, serif;
  font-size: clamp(37px, 3.5vw, 56px);
  letter-spacing: -2px;
  font-weight: 500;
  line-height: 1.48;
  margin: 24px 0 23px;
  white-space: nowrap;
}
.hero-title em {
  font-style: normal;
  color: var(--accent);
}
.hero-description {
  font-size: 12px;
  line-height: 2.05;
  max-width: 415px;
  color: var(--muted);
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 28px 0 24px;
}
.button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  font-size: 11px;
  font-weight: 550;
  border-radius: 7px;
  border: 1px solid transparent;
  padding: 10px 18px;
  transition:
    transform 0.15s,
    background 0.15s;
}
.button:hover {
  transform: translateY(-2px);
}
.button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 8px #3158d417;
}
.button.secondary {
  background: var(--surface);
  border-color: var(--border);
}
.text-button {
  padding: 0;
  gap: 7px;
  color: var(--muted);
}
.hero-note {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 10px;
}
.tiny-stack {
  display: flex;
  padding-left: 4px;
}
.tiny-stack i {
  display: block;
  width: 13px;
  height: 13px;
  margin-left: -4px;
  transform: rotate(-12deg);
  border: 1px solid var(--bg);
  background: #b7c9be;
  border-radius: 3px;
}
.tiny-stack i:nth-child(2) {
  background: #90aac6;
}
.tiny-stack i:nth-child(3) {
  background: #687c95;
}
.system-visual {
  position: relative;
  width: 100%;
  max-width: 440px;
  height: 340px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background:
    radial-gradient(var(--border) 0.7px, transparent 0.7px) 0 0/13px 13px,
    var(--surface);
  color: #bcc5d9;
  box-shadow: var(--shadow);
  isolation: isolate;
}
.visual-topline,
.visual-bottomline {
  position: absolute;
  display: flex;
  align-items: center;
  left: 20px;
  right: 20px;
  font:
    8px ui-monospace,
    monospace;
  letter-spacing: 1px;
  color: var(--muted);
  gap: 6px;
}
.visual-topline {
  top: 18px;
}
.visual-topline > span:last-child {
  margin-left: auto;
  font-size: 8px;
}
.visual-bottomline {
  bottom: 18px;
  justify-content: space-between;
  font-size: 9px;
  letter-spacing: 0.2px;
}
.visual-live-dot {
  height: 5px;
  width: 5px;
  background: #759c81;
  border-radius: 50%;
}
.visual-wires {
  position: absolute;
  inset: 30px 0 0;
  width: 100%;
  height: calc(100% - 30px);
  color: #bac7df;
  z-index: -1;
}
.visual-token {
  position: absolute;
  top: 75px;
  width: 115px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 9px 12px;
}
.token-left {
  left: 20px;
  transform: rotate(-5deg);
}
.token-right {
  right: 20px;
  transform: rotate(5deg);
}
.tiny-label {
  display: block;
  font:
    7px ui-monospace,
    monospace;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 6px;
}
.visual-token > div {
  display: flex;
  gap: 5px;
}
.visual-token i {
  display: grid;
  place-items: center;
  flex: 1;
  height: 23px;
  background: var(--accent-soft);
  color: var(--accent);
  font:
    10px ui-monospace,
    monospace;
  border: 1px solid #3158d411;
  border-radius: 3px;
}
.visual-core {
  position: absolute;
  left: 50%;
  top: 46%;
  transform: translate(-50%, -35%);
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: center;
  width: 152px;
  height: 122px;
  border: 1px solid #5776d44d;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent);
  box-shadow:
    0 8px 28px #3158d417,
    inset 0 0 0 5px var(--surface);
}
.visual-core strong {
  font-size: 13px;
  letter-spacing: 0.4px;
  margin-top: 5px;
}
.visual-core > span:not(.chip-pin) {
  font:
    8px ui-monospace,
    monospace;
  margin-top: 7px;
  opacity: 0.7;
}
.chip-pin {
  position: absolute;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0 4px,
    #91a2c3 4px 6px,
    transparent 6px 12px
  );
  width: 9px;
  height: 51px;
  top: 33px;
}
.p1 {
  left: -9px;
}
.p2 {
  right: -9px;
}
.p3 {
  transform: rotate(90deg);
  left: 71px;
  top: -31px;
}
.p4 {
  transform: rotate(90deg);
  left: 71px;
  top: 99px;
}
.visual-output {
  position: absolute;
  bottom: 53px;
  left: 50%;
  transform: translateX(-50%);
  width: 255px;
  height: 34px;
  padding: 0 11px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  display: flex;
  gap: 9px;
  align-items: center;
}
.output-square {
  height: 7px;
  width: 7px;
  background: var(--accent);
  border-radius: 2px;
}
.visual-output code {
  font:
    9px ui-monospace,
    monospace;
  color: var(--ink);
}
.visual-output code span {
  padding: 0 5px;
  color: var(--muted);
}
.output-cursor {
  height: 11px;
  width: 4px;
  background: var(--accent);
  opacity: 0.55;
  animation: blink 2s steps(2) infinite;
}
@keyframes blink {
  50% {
    opacity: 0.15;
  }
}
.stats-strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(4, 1fr) 1.3fr;
  align-items: center;
  gap: 10px;
  padding: 25px 0;
}
.stats-strip > div {
  display: flex;
  align-items: center;
  gap: 13px;
}
.stats-strip strong {
  font:
    29px ui-monospace,
    SFMono-Regular,
    monospace;
  font-weight: 400;
  letter-spacing: -1.4px;
  white-space: nowrap;
}
.stats-strip strong > span {
  font:
    19px Georgia,
    serif;
  color: var(--border);
  margin-left: 10px;
}
.stats-strip > div > span {
  font-size: 10px;
  color: var(--muted);
}
.stats-strip > p {
  font-size: 10px;
  line-height: 1.8;
  text-align: right;
  color: var(--muted);
  white-space: pre-line;
}
.home-section {
  margin-top: 53px;
}
.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 15px;
  margin-bottom: 25px;
}
.section-kicker {
  display: block;
  font:
    9px ui-monospace,
    monospace;
  letter-spacing: 1.1px;
  color: var(--muted);
  margin-bottom: 9px;
}
.section-heading h2 {
  font-size: 23px;
  letter-spacing: -0.8px;
  font-weight: 550;
}
.inline-link {
  font-size: 11px;
  display: inline-flex;
  gap: 6px;
  align-items: center;
  color: var(--muted);
  white-space: nowrap;
}
.inline-link:hover {
  color: var(--accent);
}
.module-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.module-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 22px 23px 17px;
  min-width: 0;
  transition:
    transform 0.2s,
    border-color 0.2s,
    box-shadow 0.2s;
}
.module-card:hover {
  transform: translateY(-3px);
  border-color: #aab8da;
  box-shadow: var(--shadow);
}
.module-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}
.module-icon {
  width: 43px;
  height: 43px;
  border: 1px solid currentColor;
  display: grid;
  place-items: center;
  border-radius: 11px;
}
.module-icon.blue {
  background: #edf1fc;
  border-color: #dce4fa;
}
.module-icon.amber {
  background: #fcf4e7;
  border-color: #f2e6ce;
}
.module-icon.green {
  background: #edf4ef;
  border-color: #dce9e1;
}
.module-icon.violet {
  background: #f1edfa;
  border-color: #e6ddf5;
}
.module-icon.cyan {
  background: #eaf4f4;
  border-color: #d9e9e9;
}
.module-icon.orange {
  background: #fbefea;
  border-color: #f1e1d7;
}
.module-icon.rose {
  background: #fbebef;
  border-color: #f1dce3;
}
.blue {
  color: #5276bf;
}
.amber {
  color: #ac8a49;
}
.green {
  color: #528b70;
}
.violet {
  color: #8b6caf;
}
.cyan {
  color: #57999e;
}
.orange {
  color: #b58262;
}
.rose {
  color: #aa6b86;
}
[data-theme="dark"] .module-icon {
  background: var(--surface-soft) !important;
  border-color: var(--border) !important;
}
.module-number {
  font:
    11px ui-monospace,
    monospace;
  color: var(--muted);
  opacity: 0.45;
}
.module-name-line h3 {
  font-size: 17px;
  font-weight: 570;
  letter-spacing: -0.3px;
}
.module-english {
  font:
    9px ui-monospace,
    monospace;
  color: var(--muted);
  display: block;
  margin-top: 4px;
  letter-spacing: 0.3px;
}
.module-card p {
  font-size: 11px;
  color: var(--muted);
  margin-top: 12px;
}
.module-card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 25px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 10px;
}
.module-card-foot svg {
  transition: transform 0.2s;
}
.module-card:hover .module-card-foot svg {
  transform: translate(2px, -2px);
  color: var(--accent);
}
.module-card-wide {
  grid-column: 1/-1;
  display: grid;
  grid-template-columns: 58px 1fr 220px;
  align-items: center;
  gap: 18px;
  padding: 20px 24px;
  background: var(--surface);
}
.module-card-wide .module-card-head {
  margin: 0;
}
.module-card-wide .module-number {
  display: none;
}
.module-card-wide .module-card-foot {
  border: 0;
  padding: 0;
  margin: 0;
}
.module-card-wide .module-name-line {
  display: flex;
  align-items: center;
  gap: 15px;
}
.module-card-wide .module-english {
  margin: 0;
}
.module-card-wide p {
  margin-top: 5px;
}
.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}
.topic-card {
  position: relative;
  min-width: 0;
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 20px;
  border-radius: 12px;
  transition:
    box-shadow 0.2s,
    border 0.2s;
}
.topic-card:hover {
  box-shadow: var(--shadow);
  border-color: #acb9d9;
}
.topic-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 17px;
}
.topic-tag {
  font-size: 9px;
  padding: 3px 7px;
  background: var(--surface-soft);
  border-radius: 4px;
}
.bookmark-button {
  border: 0;
  background: none;
  padding: 3px;
  color: var(--muted);
  display: grid;
  place-items: center;
  border-radius: 5px;
}
.bookmark-button:hover {
  color: var(--accent);
  background: var(--accent-soft);
}
.bookmark-button[aria-pressed="true"] {
  color: var(--accent);
}
.bookmark-button[aria-pressed="true"] svg {
  fill: var(--accent-soft);
}
.topic-card-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}
.topic-card-title h3 {
  font-size: 14px;
  font-weight: 570;
  line-height: 1.8;
  letter-spacing: -0.2px;
}
.topic-card-title svg {
  color: var(--muted);
  opacity: 0;
  transition: opacity 0.2s;
  position: relative;
  top: 4px;
}
.topic-card:hover .topic-card-title svg {
  opacity: 1;
}
.topic-card > p {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.9;
  margin-top: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 41px;
}
.topic-card-bottom {
  display: flex;
  justify-content: space-between;
  gap: 6px;
  font-size: 9px;
  color: var(--muted);
  margin-top: 24px;
}
.topic-card-bottom > span:first-child {
  display: flex;
  gap: 5px;
  align-items: center;
}
.learning-banner {
  display: flex;
  gap: 24px;
  align-items: center;
  margin: 55px 0 0;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  padding: 31px;
  border-radius: 14px;
}
.learning-banner-icon {
  height: 62px;
  width: 62px;
  display: grid;
  place-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--accent);
  flex-shrink: 0;
}
.learning-banner h2 {
  font-size: 21px;
  font-weight: 550;
  letter-spacing: -0.7px;
}
.learning-banner p {
  font-size: 11px;
  color: var(--muted);
  margin-top: 8px;
  max-width: 530px;
}
.learning-banner > .button {
  margin-left: auto;
  flex-shrink: 0;
}
.open-note {
  display: flex;
  align-items: center;
  gap: 9px;
  justify-content: center;
  padding: 35px 0 41px;
  font-size: 10px;
  color: var(--muted);
}
.open-note a {
  color: var(--accent);
  margin-left: 5px;
}
.inner-page {
  padding-top: 50px;
  padding-bottom: 65px;
  min-height: calc(100vh - 156px);
}
.page-intro {
  margin-bottom: 35px;
}
.page-intro h1 {
  font-size: 36px;
  font-weight: 550;
  letter-spacing: -1px;
  margin: 12px 0;
}
.page-intro > p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.9;
  max-width: 660px;
}
.page-intro .module-icon {
  margin-bottom: 17px;
}
.catalog-toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.catalog-search {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  height: 42px;
  padding: 0 13px;
  flex: 1;
  color: var(--muted);
}
.catalog-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: none;
  background: none;
  color: var(--ink);
  font-size: 12px;
}
.catalog-search:focus-within {
  border-color: var(--accent);
}
.view-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  padding: 3px;
}
.view-toggle button {
  display: grid;
  place-items: center;
  padding: 7px;
  border: 0;
  background: none;
  color: var(--muted);
  border-radius: 4px;
}
.view-toggle button[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent);
}
.saved-filter {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 11px;
  border-radius: 7px;
  white-space: nowrap;
}
.saved-filter[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent);
}
.filter-tabs {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.filter-tab {
  border: 1px solid var(--border);
  background: transparent;
  padding: 6px 11px;
  border-radius: 6px;
  font-size: 10px;
  color: var(--muted);
}
.filter-tab.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}
.catalog-meta {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 10px;
  margin: 25px 0 15px;
}
.topic-grid.list-view {
  grid-template-columns: 1fr;
}
.list-view .topic-card {
  display: grid;
  grid-template-columns: 110px minmax(200px, 1fr) minmax(180px, 1.3fr) 125px;
  align-items: center;
  gap: 18px;
  padding: 16px 20px;
}
.list-view .topic-card-top {
  margin: 0;
  gap: 10px;
}
.list-view .topic-card > p {
  margin: 0;
  min-height: 0;
}
.list-view .topic-card-title svg {
  display: none;
}
.list-view .topic-card-bottom {
  margin: 0;
  justify-content: end;
}
.list-view .topic-card-bottom > span:last-child {
  display: none;
}
.empty-state {
  text-align: center;
  padding: 70px 20px;
  border: 1px dashed var(--border);
  border-radius: 14px;
  color: var(--muted);
}
.empty-state h3 {
  font-size: 18px;
  color: var(--ink);
  margin: 16px 0 8px;
}
.empty-state p {
  margin-bottom: 24px;
}
.path-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.path-card {
  padding: 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  transition:
    transform 0.2s,
    border-color 0.2s;
}
.path-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}
.path-card-top {
  display: flex;
  justify-content: space-between;
  font:
    10px ui-monospace,
    monospace;
  color: var(--muted);
  margin-bottom: 28px;
}
.path-card-top .level {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 3px 9px;
  border-radius: 4px;
}
.path-card h2 {
  font-size: 23px;
  font-weight: 550;
  letter-spacing: -0.6px;
  margin-bottom: 6px;
}
.path-card h3 {
  font:
    10px ui-monospace,
    monospace;
  font-weight: 400;
  color: var(--muted);
  margin-bottom: 17px;
}
.path-card p {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.9;
}
.path-card-foot {
  display: flex;
  justify-content: space-between;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--accent);
}
.sources-list {
  display: grid;
  gap: 10px;
}
.source-row {
  display: flex;
  gap: 17px;
  align-items: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 18px 20px;
}
.source-row > span {
  font:
    11px ui-monospace,
    monospace;
  color: var(--muted);
  margin-top: 4px;
  min-width: 28px;
}
.source-row h2 {
  font-size: 13px;
  font-weight: 550;
}
.source-row p {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.9;
  margin-top: 7px;
}
.source-row > svg {
  margin-left: auto;
  color: var(--muted);
}
.source-row code {
  display: inline-block;
  font-size: 9px;
  color: var(--muted);
  margin-top: 5px;
  overflow-wrap: anywhere;
}
.search-dialog {
  padding: 0;
  max-width: 650px;
  width: calc(100vw - 32px);
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 24px 100px #0003;
  margin: 12vh auto;
  overflow: hidden;
}
.search-dialog::backdrop {
  background: #17202070;
  backdrop-filter: blur(4px);
}
.search-dialog-top {
  display: flex;
  gap: 15px;
  align-items: center;
  padding: 19px 23px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}
.search-dialog-top input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  font-size: 15px;
  color: var(--ink);
  outline: none;
}
.escape-key {
  font:
    10px ui-monospace,
    monospace;
  padding: 3px 6px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface-soft);
}
.search-hint {
  font-size: 11px;
  color: var(--muted);
  padding: 16px 23px 7px;
}
.search-results {
  max-height: 53vh;
  overflow: auto;
  padding: 5px 12px 14px;
}
.search-result {
  display: block;
  padding: 13px 14px;
  border-radius: 7px;
  margin-top: 3px;
}
.search-result:hover,
.search-result:focus {
  background: var(--accent-soft);
}
.search-result strong {
  display: block;
  font-size: 13px;
  font-weight: 550;
}
.search-result small {
  display: block;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.8;
  margin-top: 4px;
}
.search-result-empty {
  padding: 25px 12px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}
.search-dialog-footer {
  padding: 12px 23px;
  font-size: 10px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border);
}
.search-dialog-footer a {
  color: var(--accent);
}
.toast {
  position: fixed;
  bottom: 25px;
  left: calc(50% + 118px);
  transform: translate(-50%, 20px);
  opacity: 0;
  pointer-events: none;
  background: var(--ink);
  color: var(--bg);
  padding: 11px 19px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  font-size: 12px;
  z-index: 100;
  transition:
    opacity 0.2s,
    transform 0.2s;
}
.toast.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
.language-note {
  display: none;
  background: var(--accent-soft);
  border-radius: 7px;
  padding: 10px 14px;
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 25px;
}
html[lang="en"] .language-note {
  display: block;
}
html[lang="en"] .module-english {
  display: none;
}
html[lang="en"] .hero-title {
  font-family: Georgia, serif;
  font-size: clamp(33px, 3.1vw, 50px);
  letter-spacing: -1.5px;
}
html[lang="en"] .stats-strip > div > span {
  font-size: 9px;
}
@media (min-width: 1650px) {
  .hero {
    gap: 85px;
  }
  .hero-title {
    font-size: 60px;
  }
  .hero-description {
    font-size: 14px;
  }
  .module-card {
    padding: 25px 26px;
  }
  .nav-link {
    font-size: 13px;
  }
  .sidebar {
    width: 248px;
  }
  .workspace {
    margin-left: 248px;
  }
}
@media (max-width: 1250px) {
  .sidebar {
    width: 212px;
    padding: 26px 13px 16px;
  }
  .workspace {
    margin-left: 212px;
  }
  .content-wrap {
    padding-left: 32px;
    padding-right: 32px;
  }
  .topbar {
    padding: 0 30px;
  }
  .hero {
    gap: 25px;
    padding-top: 48px;
  }
  .hero-title {
    font-size: 41px;
  }
  .system-visual {
    height: 315px;
  }
  .visual-token {
    width: 94px;
  }
  .visual-token.token-left {
    left: 13px;
  }
  .visual-token.token-right {
    right: 13px;
  }
  .visual-core {
    width: 137px;
  }
  .stats-strip strong {
    font-size: 25px;
  }
  .stats-strip > div {
    gap: 8px;
  }
  .stats-strip strong > span {
    margin-left: 5px;
  }
  .stats-strip > p {
    display: none;
  }
  .stats-strip {
    grid-template-columns: repeat(4, 1fr);
  }
  .module-card {
    padding: 19px;
  }
  .learning-banner {
    padding: 24px;
    gap: 17px;
  }
  .learning-banner-icon {
    display: none;
  }
  .hero-actions {
    gap: 11px;
  }
  .hero-actions .button {
    font-size: 10px;
  }
  .brand {
    font-size: 16px;
  }
  .brand svg {
    width: 29px;
  }
  .search-trigger {
    min-width: 180px;
  }
  .list-view .topic-card {
    grid-template-columns: 100px 1fr 1.2fr;
  }
  .list-view .topic-card-bottom {
    display: none;
  }
}
@media (max-width: 1050px) {
  .sidebar {
    width: 210px;
    transform: translateX(-100%);
    transition: transform 0.2s;
  }
  .workspace {
    margin-left: 0;
  }
  .mobile-menu {
    display: grid;
  }
  .topbar {
    height: 65px;
  }
  .breadcrumb {
    margin-right: auto;
  }
  .mobile-nav-open .sidebar {
    transform: translateX(0);
  }
  .mobile-nav-open .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: #15201866;
    z-index: 35;
  }
  .hero {
    grid-template-columns: 1.15fr 1fr;
    gap: 35px;
    padding-top: 45px;
  }
  .hero-title {
    font-size: 48px;
  }
  .system-visual {
    height: 320px;
  }
  .content-wrap {
    padding-left: 40px;
    padding-right: 40px;
  }
  .toast {
    left: 50%;
  }
  .page-footer {
    padding: 25px 40px;
  }
  .skip-link {
    left: 20px;
  }
}
@media (max-width: 760px) {
  .content-wrap {
    padding-left: 24px;
    padding-right: 24px;
  }
  .topbar {
    padding: 0 20px;
    gap: 10px;
  }
  .topbar-actions {
    gap: 8px;
  }
  .search-trigger {
    min-width: 0;
    width: 32px;
    padding: 0;
    display: grid;
    place-items: center;
    border: 0;
    background: none;
  }
  .search-trigger span,
  .search-trigger kbd {
    display: none;
  }
  .github-button {
    padding-left: 9px;
  }
  .github-button span,
  .github-button > svg:last-child {
    display: none;
  }
  .breadcrumb {
    font-size: 10px;
    gap: 8px;
  }
  .breadcrumb strong {
    max-width: 180px;
  }
  .hero {
    grid-template-columns: 1fr;
    gap: 34px;
    padding: 37px 0 35px;
  }
  .hero-copy {
    text-align: left;
  }
  .hero-title {
    font-size: 48px;
    line-height: 1.5;
    margin: 22px 0 18px;
  }
  .hero-description {
    max-width: 510px;
    font-size: 13px;
  }
  .system-visual {
    max-width: none;
    height: 305px;
  }
  .visual-token {
    width: 115px;
    top: 62px;
  }
  .visual-token.token-left {
    left: 12%;
  }
  .visual-token.token-right {
    right: 12%;
  }
  .visual-core {
    width: 152px;
    top: 43%;
    height: 120px;
  }
  .visual-output {
    bottom: 45px;
  }
  .visual-bottomline {
    bottom: 15px;
  }
  .visual-topline {
    top: 14px;
  }
  .hero-note {
    font-size: 10px;
  }
  .hero-actions {
    gap: 22px;
  }
  .hero-actions .button {
    font-size: 12px;
  }
  .hero-actions .primary {
    min-height: 44px;
  }
  .stats-strip {
    padding: 23px 0;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }
  .stats-strip > div {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .stats-strip strong {
    font-size: 29px;
  }
  .stats-strip strong > span {
    display: none;
  }
  .stats-strip > div > span {
    font-size: 10px;
  }
  .section-heading {
    align-items: center;
  }
  .section-heading h2 {
    font-size: 21px;
  }
  .section-kicker {
    font-size: 8px;
    letter-spacing: 0.5px;
  }
  .section-heading > .inline-link {
    font-size: 10px;
  }
  .module-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .module-card {
    padding: 18px;
  }
  .module-card-head {
    margin-bottom: 15px;
  }
  .module-name-line h3 {
    font-size: 16px;
  }
  .module-card p {
    font-size: 10px;
    line-height: 1.9;
    min-height: 38px;
  }
  .module-card-wide {
    grid-column: 1/-1;
    grid-template-columns: 44px 1fr;
    gap: 15px;
  }
  .module-card-wide .module-card-foot {
    grid-column: 2;
    gap: 20px;
  }
  .module-card-wide p {
    min-height: 0;
  }
  .module-card-wide .module-name-line {
    display: block;
  }
  .module-card-wide .module-english {
    margin-top: 4px;
  }
  .module-card-foot {
    font-size: 9px;
  }
  .module-number {
    font-size: 9px;
  }
  .topic-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .topic-card {
    padding: 17px;
  }
  .topic-card-title h3 {
    font-size: 13px;
  }
  .topic-card-title svg {
    display: none;
  }
  .topic-card-bottom {
    font-size: 8px;
    gap: 5px;
    flex-wrap: wrap;
  }
  .topic-card > p {
    font-size: 10px;
  }
  .learning-banner {
    align-items: flex-start;
    flex-direction: column;
    margin-top: 40px;
    padding: 24px;
  }
  .learning-banner > .button {
    margin: 7px 0 0;
  }
  .learning-banner h2 {
    font-size: 20px;
  }
  .open-note {
    align-items: flex-start;
    padding: 28px 6px 32px;
    text-align: center;
    font-size: 10px;
  }
  .open-note > svg {
    display: none;
  }
  .open-note a {
    display: block;
    margin: 7px 0 0;
  }
  .page-footer {
    padding: 24px;
    gap: 15px;
    font-size: 9px;
  }
  .page-footer .footer-dot,
  .page-footer > span > span:last-child {
    display: none;
  }
  .page-footer > div {
    gap: 13px;
  }
  .home-section {
    margin-top: 38px;
  }
  .inner-page {
    padding-top: 33px;
  }
  .page-intro h1 {
    font-size: 31px;
  }
  .path-grid {
    grid-template-columns: 1fr;
  }
  .catalog-toolbar {
    gap: 8px;
  }
  .catalog-search {
    height: 42px;
  }
  .saved-filter {
    font-size: 10px;
  }
  .saved-filter svg {
    width: 13px;
  }
  .saved-filter > span {
    display: none;
  }
  .filter-tabs {
    gap: 6px;
  }
  .filter-tab {
    padding: 5px 9px;
    font-size: 10px;
  }
  .list-view .topic-card {
    grid-template-columns: 75px 1fr;
    padding: 15px;
    gap: 12px;
  }
  .list-view .topic-card > p {
    grid-column: 2;
  }
  .list-view .topic-card .bookmark-button {
    display: none;
  }
  html[lang="en"] .hero-title {
    font-size: 44px;
  }
  html[lang="en"] .stats-strip > div > span {
    font-size: 9px;
  }
  .toast {
    max-width: 90vw;
    white-space: nowrap;
  }
  .search-dialog {
    margin-top: 8vh;
  }
  .source-row {
    padding: 15px;
    gap: 10px;
  }
}
@media (max-width: 400px) {
  .hero-title {
    font-size: 42px;
  }
  .module-card {
    padding: 14px;
  }
  .topic-grid {
    grid-template-columns: 1fr;
  }
  .visual-token.token-left {
    left: 7%;
  }
  .visual-token.token-right {
    right: 7%;
  }
  .breadcrumb-root {
    display: none;
  }
  .section-heading .inline-link > span {
    max-width: 74px;
    white-space: normal;
    text-align: right;
  }
  .module-card p {
    min-height: 38px;
  }
  .module-card-foot {
    margin-top: 18px;
  }
  .hero-actions {
    gap: 16px;
  }
  .hero-actions .button {
    font-size: 10px;
  }
  html[lang="en"] .hero-title {
    font-size: 36px;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}
/* 阅读优先：小字仍保持明确对比，触控入口保留足够面积。 */
:root {
  --muted: #66736b;
}
.nav-link {
  font-size: 13px;
  min-height: 42px;
}
.sidebar-edition {
  font-size: 11px;
}
.nav-label {
  font-size: 11px;
}
.hero-description {
  font-size: 14px;
}
.eyebrow {
  font-size: 11px;
}
.hero-actions .button {
  font-size: 12px;
}
.stats-strip > div > span {
  font-size: 11px;
}
.module-card p {
  font-size: 12px;
  line-height: 1.8;
}
.module-english {
  font-size: 10px;
}
.module-card-foot {
  font-size: 11px;
}
.topic-card-title h3 {
  font-size: 15px;
}
.topic-card > p {
  font-size: 12px;
}
.topic-card-bottom {
  font-size: 10px;
}
.topic-tag {
  font-size: 10px;
}
.learning-banner p {
  font-size: 12px;
}
.inline-link {
  font-size: 12px;
}
.page-footer {
  font-size: 11px;
}
.open-note {
  font-size: 11px;
}
.breadcrumb {
  font-size: 12px;
}
.search-trigger {
  font-size: 12px;
}
.filter-tab {
  font-size: 12px;
}
.catalog-search input {
  font-size: 13px;
}
.path-card p {
  font-size: 13px;
}
.source-row h2 {
  font-size: 15px;
}
.source-row p {
  font-size: 12px;
}
.section-kicker {
  font-size: 10px;
}
@media (max-width: 760px) {
  .nav-link {
    min-height: 44px;
  }
  .hero-title {
    font-size: 46px;
  }
  .hero-description {
    font-size: 14px;
  }
  .topic-card-title h3 {
    font-size: 15px;
  }
  .module-card p {
    font-size: 12px;
    min-height: 44px;
  }
  .module-card-wide p {
    min-height: 0;
  }
  .module-card-foot {
    font-size: 10px;
  }
  .topic-card > p {
    font-size: 12px;
  }
  .stats-strip > div > span {
    font-size: 10px;
  }
  .breadcrumb {
    font-size: 10px;
  }
  .icon-button,
  .language-button {
    min-height: 38px;
    min-width: 32px;
  }
  .filter-tab {
    min-height: 36px;
    font-size: 11px;
  }
  .page-footer {
    font-size: 10px;
  }
  .hero-actions .button {
    font-size: 11px;
  }
  .section-heading > .inline-link {
    font-size: 11px;
  }
}
@media (max-width: 400px) {
  .hero-title {
    font-size: 41px;
  }
  .hero-actions .button {
    font-size: 10px;
  }
  .module-card p {
    min-height: 44px;
  }
  .module-card-wide p {
    min-height: 0;
  }
}

@media (max-width: 1050px) {
  .sidebar {
    visibility: hidden;
  }
  .mobile-nav-open .sidebar {
    visibility: visible;
  }
}
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