:root {
  color-scheme: dark light;
  --ink: #eeeade;
  --muted: #b8b09e;
  --faint: #7f796b;
  --paper: #11130f;
  --paper-2: #181a15;
  --line: rgba(226, 216, 186, 0.18);
  --accent: #d8b35b;
  --accent-2: #86a7a0;
  --danger: #c78262;
  --body-font: "Iowan Old Style", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", SimSun, serif;
  --sans-font: "Gill Sans", "Avenir Next", "Segoe UI", "Microsoft YaHei", sans-serif;
  --math-font: "Cambria Math", "STIX Two Math", "Latin Modern Math", serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  scroll-behavior: smooth;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  color: var(--ink);
  font-family: var(--body-font);
  line-height: 1.85;
  background:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    radial-gradient(circle at top left, rgba(216, 179, 91, 0.11), transparent 34rem),
    var(--paper);
  background-size: 100% 9px, auto, auto;
}

body > * {
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-color: rgba(216, 179, 91, 0.45);
  text-underline-offset: 0.22em;
}

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

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  transform: translateY(-150%);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line);
  background: var(--paper-2);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--line);
  background: rgba(17, 19, 15, 0.9);
  backdrop-filter: blur(14px);
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--line);
  color: var(--accent);
  font-family: var(--math-font);
  font-size: 1.2rem;
}

.brand strong,
.brand small {
  display: block;
  overflow-wrap: anywhere;
}

.brand strong {
  font-size: 1rem;
  letter-spacing: 0;
}

.brand small,
.site-nav,
.eyebrow,
.button,
.entry-meta,
.reader-pagination,
.rail-back {
  font-family: var(--sans-font);
}

.brand small {
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.3;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem;
  font-size: 0.9rem;
  min-width: 0;
}

.site-nav a {
  padding: 0.35rem 0.6rem;
  border: 1px solid transparent;
  text-decoration: none;
  color: var(--muted);
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  border-color: var(--line);
  color: var(--ink);
}

main {
  min-height: 70vh;
}

.hero,
.page-lead,
.reading-list,
.section-grid,
.references {
  width: min(1120px, calc(100% - 2rem));
  max-width: calc(100% - 2rem);
  margin-inline: auto;
}

.hero {
  min-height: calc(100vh - 5rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 18rem;
  align-items: center;
  gap: clamp(2rem, 7vw, 6rem);
  padding-block: clamp(4rem, 10vw, 8rem);
}

.hero-copy {
  max-width: 45rem;
  min-width: 0;
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--accent-2);
  font-size: 0.78rem;
}

h1,
h2,
h3 {
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(2.5rem, 8vw, 6.8rem);
}

h2 {
  font-size: clamp(1.65rem, 3vw, 2.5rem);
}

.hero-subtitle {
  margin: 0.25rem 0 1.2rem;
  color: var(--accent);
  font-size: clamp(1.15rem, 2.4vw, 2rem);
}

.hero p,
.page-lead p,
.text-block p {
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 2.65rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
}

.button.primary {
  border-color: rgba(216, 179, 91, 0.55);
  background: rgba(216, 179, 91, 0.14);
}

.hero-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem 1rem;
  align-self: end;
  padding: 1.25rem;
  border: 1px solid var(--line);
  background: rgba(24, 26, 21, 0.72);
}

.hero-panel span {
  color: var(--muted);
}

.hero-panel strong {
  color: var(--accent);
  font-size: 1.35rem;
}

.page-lead {
  padding-block: clamp(3rem, 7vw, 6rem) 2rem;
  max-width: 780px;
}

.page-lead h1 {
  font-size: clamp(2rem, 5vw, 4rem);
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(12rem, 0.6fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.text-block p {
  margin: 0 0 1rem;
  overflow-wrap: anywhere;
}

.reading-list {
  padding-block: 2rem 5rem;
}

.entry-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 0.8rem;
}

.entry-list.wide {
  width: min(980px, calc(100% - 2rem));
  max-width: calc(100% - 2rem);
  margin: 0 auto 5rem;
}

.entry-card {
  display: grid;
  gap: 0.25rem;
  min-height: 8rem;
  padding: 1rem;
  border: 1px solid var(--line);
  background: rgba(24, 26, 21, 0.55);
  text-decoration: none;
  min-width: 0;
}

.entry-card span {
  color: var(--accent);
  font-family: var(--math-font);
}

.entry-card strong {
  font-size: 1.25rem;
}

.entry-card small,
.entry-card p {
  color: var(--muted);
  overflow-wrap: anywhere;
}

.references {
  padding-bottom: 5rem;
}

.references a {
  display: block;
  padding: 0.75rem 0;
  border-top: 1px solid var(--line);
}

.reader-shell {
  display: grid;
  grid-template-columns: minmax(14rem, 18rem) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  width: min(1180px, calc(100% - 2rem));
  max-width: calc(100% - 2rem);
  margin: 0 auto;
  padding-block: 2rem 5rem;
}

.reader-rail {
  position: sticky;
  top: 5.25rem;
  align-self: start;
  max-height: calc(100vh - 6rem);
  overflow: auto;
  padding-right: 0.5rem;
}

.rail-back {
  display: inline-block;
  margin-bottom: 1.5rem;
  color: var(--accent);
  text-decoration: none;
}

.entry-meta {
  display: grid;
  gap: 0.7rem;
  margin: 0 0 1.5rem;
  padding: 1rem 0;
  border-block: 1px solid var(--line);
  font-size: 0.85rem;
}

.entry-meta div {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 0.75rem;
}

.entry-meta dt {
  color: var(--faint);
}

.entry-meta dd {
  margin: 0;
  color: var(--muted);
}

.local-toc {
  display: grid;
  gap: 0.35rem;
  font-family: var(--sans-font);
  font-size: 0.86rem;
}

.local-toc strong {
  margin-bottom: 0.3rem;
}

.local-toc a {
  color: var(--muted);
  text-decoration: none;
}

.local-toc .toc-depth-3 {
  padding-left: 1rem;
}

.reader-main {
  min-width: 0;
  max-width: 100%;
}

.reader-title {
  max-width: 760px;
  margin: 0 auto 2rem;
  padding-block: 2rem 1rem;
  border-bottom: 1px solid var(--line);
}

.reader-title p {
  margin: 0 0 0.75rem;
  color: var(--accent-2);
  font-family: var(--sans-font);
}

.reader-title h1 {
  font-size: clamp(2rem, 5vw, 4.4rem);
}

.reader-description {
  margin-top: 1rem;
  color: var(--muted);
}

.prose {
  max-width: 760px;
  margin-inline: auto;
  font-size: clamp(1.04rem, 1.5vw, 1.16rem);
  min-width: 0;
  overflow-wrap: break-word;
}

.prose h2,
.prose h3,
.prose h4 {
  margin: 2.6em 0 0.8em;
}

.prose h2 {
  font-size: 1.85rem;
  color: var(--accent);
}

.prose h3 {
  font-size: 1.35rem;
}

.prose p {
  margin: 1.05em 0;
}

.prose blockquote {
  margin: 1.6rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 2px solid var(--accent);
  color: var(--muted);
}

.prose figure {
  margin: 2rem 0;
}

.prose figure img {
  width: min(100%, 680px);
  margin-inline: auto;
  border: 1px solid var(--line);
}

.prose figcaption {
  margin-top: 0.55rem;
  color: var(--faint);
  text-align: center;
  font-family: var(--sans-font);
  font-size: 0.86rem;
}

.prose math,
.MathJax,
.katex {
  font-family: var(--math-font);
  max-width: 100%;
}

.prose math {
  overflow-wrap: normal;
}

.prose math[display="block"] {
  display: block;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.75rem 0;
}

.prose mjx-container[display="true"],
.prose .math-display {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  width: 100%;
  padding: 0.75rem 0;
}

.prose mjx-container {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

.prose sup a {
  color: var(--accent);
}

.prose .footnotes {
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.heading-anchor {
  text-decoration: none;
}

.reader-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  max-width: 760px;
  margin: 3rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.reader-pagination a {
  display: grid;
  gap: 0.25rem;
  min-height: 5rem;
  padding: 0.9rem;
  border: 1px solid var(--line);
  text-decoration: none;
  min-width: 0;
}

.reader-pagination a:last-child {
  text-align: right;
}

.reader-pagination span {
  color: var(--faint);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem clamp(1rem, 3vw, 2.5rem);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans-font);
  font-size: 0.86rem;
}

@media (max-width: 860px) {
  .site-header {
    position: static;
    display: grid;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero,
  .section-grid,
  .reader-shell {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-panel {
    align-self: auto;
  }

  .reader-rail {
    position: static;
    max-height: none;
    padding: 0;
    width: 100%;
    overflow: visible;
  }

  .local-toc {
    display: none;
  }
}

@media (max-width: 560px) {
  .hero,
  .page-lead,
  .reading-list,
  .section-grid,
  .references,
  .entry-list.wide,
  .reader-shell {
    width: min(100% - 1rem, 1120px);
    max-width: calc(100% - 1rem);
  }

  .brand small {
    display: none;
  }

  .site-header {
    padding-inline: 0.5rem;
  }

  .site-nav a {
    padding-inline: 0.3rem;
    font-size: 0.84rem;
  }

  .hero-actions,
  .site-footer {
    display: grid;
  }

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

  .reader-pagination a:last-child {
    text-align: left;
  }
}

@media (prefers-color-scheme: light) {
  :root {
    --ink: #221e18;
    --muted: #635b4d;
    --faint: #8c8170;
    --paper: #f4f0e6;
    --paper-2: #fffaf0;
    --line: rgba(53, 45, 31, 0.16);
    --accent: #8a5d16;
    --accent-2: #4e756d;
  }

  body {
    background:
      linear-gradient(rgba(90, 65, 30, 0.035) 1px, transparent 1px),
      radial-gradient(circle at top left, rgba(184, 135, 42, 0.12), transparent 34rem),
      var(--paper);
    background-size: 100% 9px, auto, auto;
  }

  .site-header {
    background: rgba(244, 240, 230, 0.9);
  }
}