:root {
  --ink: #000;
  --ink-soft: #070706;
  --panel: rgba(10, 10, 9, 0.82);
  --panel-solid: #0a0a09;
  --paper: #f4f0e8;
  --paper-warm: #f4e7c8;
  --muted: #aaa49a;
  --dim: #6f6a62;
  --gold: #e6c78e;
  --gold-deep: #d7a83f;
  --gold-bright: #ffc700;
  --line: rgba(255, 255, 255, 0.12);
  --line-soft: rgba(255, 255, 255, 0.075);
  --header-height: 76px;
  --cut-sm: 7px;
  --cut-md: 12px;
  --cut-lg: 18px;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, "Noto Serif SC", serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(90deg, transparent 0, rgba(255, 255, 255, 0.018) 50%, transparent 100%),
    radial-gradient(circle at 62% 0%, rgba(230, 199, 142, 0.08), transparent 33rem),
    var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.12'/%3E%3C/svg%3E");
  content: "";
  opacity: 0.12;
  pointer-events: none;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

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

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 1px solid var(--gold-bright);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 200;
  top: 10px;
  left: 12px;
  padding: 10px 14px;
  transform: translateY(-160%);
  border: 1px solid var(--gold);
  background: #050505;
  color: var(--paper);
  font: 11px var(--mono);
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.skip-link:focus {
  transform: none;
}

.reading-progress {
  position: fixed;
  z-index: 120;
  top: 0;
  right: 0;
  left: 0;
  height: 2px;
  background: rgba(255, 255, 255, 0.025);
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  transform-origin: left;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold-bright));
  box-shadow: 0 0 14px rgba(255, 199, 0, 0.65);
}

.ambient {
  position: fixed;
  z-index: -1;
  border: 1px solid rgba(230, 199, 142, 0.065);
  border-radius: 50%;
  pointer-events: none;
}

.ambient-one {
  top: 18vh;
  right: -26rem;
  width: 48rem;
  height: 48rem;
  box-shadow: inset 0 0 8rem rgba(230, 199, 142, 0.02), 0 0 8rem rgba(230, 199, 142, 0.02);
}

.ambient-two {
  bottom: -18rem;
  left: 17vw;
  width: 32rem;
  height: 32rem;
}

.edge-waves {
  position: fixed;
  z-index: 0;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.72;
  pointer-events: none;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto;
  align-items: center;
  height: var(--header-height);
  padding: 0 clamp(18px, 3vw, 48px);
  border-bottom: 1px solid transparent;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.96), rgba(0, 0, 0, 0.74));
  transition: border-color 180ms ease, backdrop-filter 180ms ease, background 180ms ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(0, 0, 0, 0.84);
  backdrop-filter: blur(18px) saturate(130%);
}

.brand {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 11px;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(230, 199, 142, 0.3);
  object-fit: cover;
  clip-path: polygon(0 var(--cut-sm), var(--cut-sm) 0, calc(100% - var(--cut-sm)) 0, 100% var(--cut-sm), 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, var(--cut-sm) 100%, 0 calc(100% - var(--cut-sm)));
}

.brand > span {
  display: grid;
  gap: 2px;
}

.brand strong {
  color: var(--paper);
  font: 500 15px/1 var(--mono);
  letter-spacing: 0.24em;
}

.brand small {
  color: var(--gold);
  font: 9px/1 var(--mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.language-switch {
  position: relative;
  color: rgba(255, 255, 255, 0.68);
  font: 10px/44px var(--mono);
  letter-spacing: 0.14em;
  text-decoration: none;
  text-transform: uppercase;
  transition: color 160ms ease;
}

.language-switch::after {
  position: absolute;
  right: 0;
  bottom: 6px;
  left: 0;
  height: 1px;
  transform: scaleX(0);
  transform-origin: right;
  background: var(--gold);
  content: "";
  transition: transform 180ms ease;
}

.language-switch:hover {
  color: var(--paper);
}

.language-switch:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 18px;
}

.search-trigger,
.menu-trigger {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
}

.search-trigger {
  gap: 9px;
  padding: 0;
  font: 10px var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.search-trigger:hover,
.menu-trigger:hover {
  color: var(--gold);
}

.search-trigger svg,
.menu-trigger svg {
  width: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.5;
}

.search-trigger kbd {
  padding: 4px 6px;
  border: 1px solid var(--line);
  color: rgba(255, 255, 255, 0.36);
  font: 8px var(--mono);
  clip-path: polygon(0 4px, 4px 0, calc(100% - 4px) 0, 100% 4px, 100% calc(100% - 4px), calc(100% - 4px) 100%, 4px 100%, 0 calc(100% - 4px));
}

.menu-trigger {
  display: none;
  width: 42px;
  padding: 0;
  border: 1px solid var(--line);
  clip-path: polygon(0 var(--cut-sm), var(--cut-sm) 0, calc(100% - var(--cut-sm)) 0, 100% var(--cut-sm), 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, var(--cut-sm) 100%, 0 calc(100% - var(--cut-sm)));
}

.reader-shell {
  display: grid;
  grid-template-columns: 270px minmax(0, 820px) 210px;
  gap: clamp(34px, 4vw, 70px);
  width: min(100%, 1490px);
  min-height: calc(100vh - var(--header-height));
  margin: 0 auto;
  padding: 0 clamp(24px, 3vw, 48px);
}

.chapter-sidebar,
.page-outline {
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(230, 199, 142, 0.2) transparent;
}

.chapter-sidebar {
  padding: 35px 0 32px;
  border-right: 1px solid var(--line-soft);
}

.sidebar-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-right: 25px;
  padding: 0 0 20px;
  border-bottom: 1px solid var(--line);
  color: var(--gold);
  font: 9px var(--mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.sidebar-heading b {
  color: rgba(255, 255, 255, 0.32);
  font-weight: 400;
}

.chapter-nav {
  display: grid;
  padding: 14px 25px 14px 0;
}

.chapter-link {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  min-height: 43px;
  padding: 10px 8px 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.045);
  color: rgba(255, 255, 255, 0.52);
  text-decoration: none;
  transition: color 150ms ease, border-color 150ms ease;
}

.chapter-link::before {
  position: absolute;
  top: 23%;
  left: -1px;
  width: 1px;
  height: 54%;
  transform: scaleY(0);
  transform-origin: center;
  background: var(--gold-bright);
  box-shadow: 0 0 12px rgba(255, 199, 0, 0.7);
  content: "";
  transition: transform 160ms ease;
}

.chapter-link span {
  color: rgba(230, 199, 142, 0.38);
  font: 8px var(--mono);
  letter-spacing: 0.08em;
  transition: transform 150ms ease;
}

.chapter-link strong {
  font-size: 11px;
  font-weight: 450;
  line-height: 1.45;
  transition: transform 150ms ease;
}

.chapter-link:hover,
.chapter-link.is-active {
  border-color: rgba(230, 199, 142, 0.12);
  color: var(--paper);
}

.chapter-link.is-active::before {
  transform: scaleY(1);
}

.chapter-link:hover span,
.chapter-link:hover strong,
.chapter-link.is-active span,
.chapter-link.is-active strong {
  transform: translateX(8px);
}

.chapter-link.is-active span {
  color: var(--gold);
}

.sidebar-footer {
  display: grid;
  gap: 14px;
  margin: 18px 25px 0 0;
  color: rgba(255, 255, 255, 0.3);
  font: 8px var(--mono);
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.sidebar-footer i {
  display: block;
  width: 42px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold-deep), transparent);
}

.sidebar-backdrop {
  display: none;
}

.reader-main {
  min-width: 0;
  padding: clamp(62px, 7vw, 100px) 0 40px;
}

.paper {
  min-height: 55vh;
}

.document-masthead {
  position: relative;
  padding: 0 0 clamp(38px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
}

.document-masthead::after {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 96px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold-bright), transparent);
  box-shadow: 0 0 12px rgba(255, 199, 0, 0.35);
  content: "";
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 13px;
  margin: 0 0 23px;
  color: var(--gold);
  font: 9px var(--mono);
  letter-spacing: 0.21em;
  text-transform: uppercase;
}

.eyebrow span {
  width: 34px;
  height: 1px;
  background: var(--gold-deep);
  box-shadow: 0 0 10px rgba(215, 168, 63, 0.45);
}

.document-masthead h1,
.landing-copy h1 {
  margin: 0;
  color: var(--paper);
  font-family: var(--serif);
  font-size: clamp(48px, 7vw, 83px);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.98;
  text-wrap: balance;
}

html[lang="zh-CN"] .document-masthead h1,
html[lang="zh-CN"] .landing-copy h1 {
  font-size: clamp(43px, 6.3vw, 74px);
  letter-spacing: -0.055em;
  line-height: 1.08;
}

.document-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin-top: 28px;
  color: rgba(255, 255, 255, 0.37);
  font: 8px var(--mono);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.document-content {
  padding: clamp(38px, 5vw, 64px) 0 0;
  color: rgba(244, 240, 232, 0.82);
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.86;
}

html[lang="zh-CN"] .document-content {
  line-height: 2;
  letter-spacing: 0.01em;
}

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

.document-content p,
.document-content ul,
.document-content ol,
.document-content blockquote,
.document-content table,
.document-content .document-figure {
  margin: 0 0 1.45em;
}

.document-content h2,
.document-content h3,
.document-content h4 {
  position: relative;
  scroll-margin-top: calc(var(--header-height) + 30px);
  color: var(--paper-warm);
  text-wrap: balance;
}

.document-content h2 {
  margin: 2.4em 0 0.72em;
  padding-top: 0.6em;
  font-family: var(--serif);
  font-size: clamp(29px, 3.3vw, 42px);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.14;
}

.document-content h2::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 28px;
  height: 1px;
  background: var(--gold-deep);
  content: "";
}

.document-content h3 {
  margin: 2em 0 0.7em;
  font-size: 1.16em;
  font-weight: 600;
  line-height: 1.35;
}

.heading-anchor {
  display: inline-block;
  margin-left: 0.35em;
  color: transparent;
  font: 0.45em var(--mono);
  text-decoration: none;
  vertical-align: middle;
  transition: color 150ms ease;
}

.document-content h2:hover .heading-anchor,
.document-content h3:hover .heading-anchor,
.heading-anchor:focus-visible {
  color: var(--gold-deep);
}

.document-content a {
  color: var(--gold);
  text-decoration-color: rgba(230, 199, 142, 0.36);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.document-content a:hover {
  color: var(--gold-bright);
  text-decoration-color: currentColor;
}

.document-content strong {
  color: var(--paper);
  font-weight: 650;
}

.document-content ul,
.document-content ol {
  padding-left: 1.3em;
}

.document-content li {
  margin: 0.35em 0;
  padding-left: 0.35em;
}

.document-content li::marker {
  color: var(--gold-deep);
}

.document-content blockquote {
  padding: 1.1em 1.35em;
  border-left: 1px solid var(--gold-deep);
  background: rgba(230, 199, 142, 0.04);
  color: var(--paper-warm);
}

.document-content code {
  padding: 0.16em 0.34em;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.035);
  color: var(--gold);
  font: 0.86em var(--mono);
}

.document-content pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--line);
  background: #060606;
}

.document-content pre code {
  padding: 0;
  border: 0;
  background: none;
}

.document-content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.document-content th,
.document-content td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  text-align: left;
}

.document-content th {
  color: var(--gold);
  font: 9px var(--mono);
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.document-figure {
  position: relative;
  margin-top: 2.4em !important;
  padding: clamp(12px, 2vw, 20px);
  border: 1px solid rgba(230, 199, 142, 0.18);
  background:
    radial-gradient(circle at 20% 0, rgba(230, 199, 142, 0.06), transparent 34%),
    rgba(255, 255, 255, 0.02);
  clip-path: polygon(0 var(--cut-md), var(--cut-md) 0, calc(100% - var(--cut-md)) 0, 100% var(--cut-md), 100% calc(100% - var(--cut-md)), calc(100% - var(--cut-md)) 100%, var(--cut-md) 100%, 0 calc(100% - var(--cut-md)));
}

.document-figure::before {
  position: absolute;
  top: -1px;
  left: -1px;
  width: 70px;
  height: 1px;
  background: var(--gold);
  content: "";
}

.document-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
}

.document-figure figcaption {
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.4);
  font: 8px/1.5 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.page-outline {
  padding: 39px 0 32px;
}

.outline-label {
  margin-bottom: 20px;
  color: rgba(255, 255, 255, 0.34);
  font: 8px var(--mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.page-outline nav {
  display: grid;
  border-left: 1px solid var(--line-soft);
}

.outline-link {
  padding: 7px 0 7px 15px;
  border-left: 1px solid transparent;
  color: rgba(255, 255, 255, 0.36);
  font-size: 10px;
  line-height: 1.45;
  text-decoration: none;
  transition: color 150ms ease, border-color 150ms ease;
}

.outline-level-3 {
  padding-left: 26px;
  font-size: 9px;
}

.outline-link:hover,
.outline-link.is-active {
  margin-left: -1px;
  border-left-color: var(--gold);
  color: var(--paper);
}

.outline-empty {
  color: var(--dim);
  font-size: 10px;
  line-height: 1.5;
}

.outline-signal {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 36px;
  color: rgba(230, 199, 142, 0.38);
  font: 7px var(--mono);
  letter-spacing: 0.13em;
}

.outline-signal span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold-deep);
  box-shadow: 0 0 10px rgba(215, 168, 63, 0.7);
}

.pagination {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(65px, 9vw, 110px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--line);
  clip-path: polygon(0 var(--cut-md), var(--cut-md) 0, calc(100% - var(--cut-md)) 0, 100% var(--cut-md), 100% calc(100% - var(--cut-md)), calc(100% - var(--cut-md)) 100%, var(--cut-md) 100%, 0 calc(100% - var(--cut-md)));
}

.pagination-link {
  display: grid;
  min-height: 116px;
  align-content: center;
  gap: 9px;
  padding: 22px 25px;
  background: var(--ink);
  color: rgba(255, 255, 255, 0.62);
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease;
}

.pagination-link span {
  color: var(--gold-deep);
  font: 8px var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.pagination-link strong {
  font-family: var(--serif);
  font-size: clamp(18px, 2.2vw, 25px);
  font-weight: 400;
  line-height: 1.18;
}

.pagination-link.next {
  text-align: right;
}

.pagination-link:hover {
  background: rgba(230, 199, 142, 0.045);
  color: var(--paper-warm);
}

.document-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 0 0;
  color: rgba(255, 255, 255, 0.26);
  font: 7px var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.landing-paper {
  width: min(100%, 980px);
  margin-left: auto;
  margin-right: auto;
}

.landing-hero {
  position: relative;
  display: grid;
  min-height: min(620px, calc(100vh - 150px));
  align-items: end;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #070706;
  clip-path: polygon(0 var(--cut-lg), var(--cut-lg) 0, calc(100% - var(--cut-lg)) 0, 100% var(--cut-lg), 100% calc(100% - var(--cut-lg)), calc(100% - var(--cut-lg)) 100%, var(--cut-lg) 100%, 0 calc(100% - var(--cut-lg)));
}

.landing-hero::before {
  position: absolute;
  z-index: 1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.99) 0%, rgba(0, 0, 0, 0.9) 38%, rgba(0, 0, 0, 0.2) 100%),
    linear-gradient(0deg, #050505 0%, transparent 65%);
  content: "";
}

.landing-hero::after {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold-bright), transparent);
  box-shadow: 0 0 18px rgba(255, 199, 0, 0.45);
  content: "";
}

.landing-visual {
  position: absolute;
  inset: 0;
}

.landing-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 65% center;
  filter: saturate(0.82) contrast(1.08);
}

.landing-copy {
  position: relative;
  z-index: 3;
  width: min(650px, 88%);
  padding: clamp(30px, 5vw, 64px);
}

.landing-copy h1 {
  font-size: clamp(56px, 9vw, 100px);
  text-shadow: 0 16px 60px rgba(0, 0, 0, 0.9);
}

.landing-source {
  max-width: 570px;
  margin-top: 28px;
  color: rgba(255, 255, 255, 0.66);
  font-size: 14px;
  line-height: 1.75;
}

.landing-source p {
  margin: 0 0 6px;
}

.landing-source a {
  color: var(--gold);
}

.primary-action {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  gap: 22px;
  margin-top: 26px;
  padding: 0 19px;
  border: 1px solid rgba(230, 199, 142, 0.55);
  background: rgba(230, 199, 142, 0.07);
  color: var(--paper-warm);
  font: 9px var(--mono);
  letter-spacing: 0.14em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
  clip-path: polygon(0 var(--cut-sm), var(--cut-sm) 0, calc(100% - var(--cut-sm)) 0, 100% var(--cut-sm), 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, var(--cut-sm) 100%, 0 calc(100% - var(--cut-sm)));
}

.primary-action svg,
.chapter-grid svg {
  width: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.5;
}

.primary-action:hover {
  border-color: var(--gold-bright);
  background: var(--gold-bright);
  color: #000;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  border: 1px solid var(--line);
  background: var(--line);
  clip-path: polygon(0 var(--cut-md), var(--cut-md) 0, calc(100% - var(--cut-md)) 0, 100% var(--cut-md), 100% calc(100% - var(--cut-md)), calc(100% - var(--cut-md)) 100%, var(--cut-md) 100%, 0 calc(100% - var(--cut-md)));
}

.chapter-grid a {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) 18px;
  gap: 13px;
  align-items: center;
  min-height: 90px;
  padding: 18px 20px;
  background: #050505;
  color: rgba(255, 255, 255, 0.62);
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease;
}

.chapter-grid a:hover {
  background: rgba(230, 199, 142, 0.045);
  color: var(--paper-warm);
}

.chapter-grid a span {
  color: var(--gold-deep);
  font: 8px var(--mono);
}

.chapter-grid a strong {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.2;
}

.chapter-grid a svg {
  opacity: 0.35;
  transition: transform 180ms ease, opacity 180ms ease;
}

.chapter-grid a:hover svg {
  transform: translateX(3px);
  opacity: 1;
}

.search-dialog {
  width: min(720px, calc(100vw - 28px));
  max-height: min(720px, calc(100vh - 30px));
  padding: 0;
  overflow: hidden;
  border: 1px solid rgba(230, 199, 142, 0.28);
  border-radius: 0;
  background: rgba(5, 5, 5, 0.96);
  color: var(--paper);
  box-shadow: 0 32px 120px rgba(0, 0, 0, 0.85), 0 0 70px rgba(230, 199, 142, 0.08);
  backdrop-filter: blur(24px);
  clip-path: polygon(0 var(--cut-md), var(--cut-md) 0, calc(100% - var(--cut-md)) 0, 100% var(--cut-md), 100% calc(100% - var(--cut-md)), calc(100% - var(--cut-md)) 100%, var(--cut-md) 100%, 0 calc(100% - var(--cut-md)));
}

.search-dialog::backdrop {
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(5px);
}

.search-panel {
  min-height: 210px;
}

.search-header {
  display: grid;
  grid-template-columns: 22px 1fr auto;
  align-items: center;
  gap: 13px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}

.search-header svg {
  width: 20px;
  fill: none;
  stroke: var(--gold);
  stroke-linecap: round;
  stroke-width: 1.5;
}

.search-header input {
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--serif);
  font-size: 22px;
}

.search-header input::placeholder {
  color: rgba(255, 255, 255, 0.3);
}

.search-header button {
  padding: 5px 7px;
  border: 1px solid var(--line);
  background: transparent;
  color: rgba(255, 255, 255, 0.42);
  font: 8px var(--mono);
  cursor: pointer;
}

.search-hint,
.search-empty {
  margin: 0;
  padding: 34px 22px;
  color: rgba(255, 255, 255, 0.35);
  font-size: 12px;
  text-align: center;
}

.search-results {
  display: grid;
  max-height: 510px;
  overflow-y: auto;
}

.search-result {
  display: grid;
  grid-template-columns: 35px minmax(0, 1fr);
  gap: 14px;
  padding: 17px 21px;
  border-bottom: 1px solid var(--line-soft);
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
}

.search-result:hover,
.search-result:focus-visible {
  background: rgba(230, 199, 142, 0.05);
  color: var(--paper);
}

.search-result > span {
  color: var(--gold-deep);
  font: 8px var(--mono);
}

.search-result strong {
  display: block;
  color: inherit;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 400;
}

.search-result small {
  display: -webkit-box;
  margin-top: 6px;
  overflow: hidden;
  color: rgba(255, 255, 255, 0.35);
  font-size: 11px;
  line-height: 1.5;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

@media (max-width: 1180px) {
  .reader-shell {
    grid-template-columns: 250px minmax(0, 820px);
    max-width: 1160px;
  }

  .page-outline {
    display: none;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 68px;
  }

  .site-header {
    grid-template-columns: 1fr auto;
    padding: 0 18px;
  }

  .header-actions {
    gap: 11px;
  }

  .search-trigger span,
  .search-trigger kbd {
    display: none;
  }

  .language-switch {
    font-size: 9px;
  }

  .menu-trigger {
    display: inline-flex;
  }

  .reader-shell {
    display: block;
    width: 100%;
    padding: 0 clamp(18px, 5vw, 44px);
  }

  .reader-main {
    width: min(100%, 780px);
    margin: 0 auto;
    padding-top: clamp(48px, 8vw, 72px);
  }

  .chapter-sidebar {
    position: fixed;
    z-index: 111;
    top: 0;
    bottom: 0;
    left: 0;
    width: min(340px, 88vw);
    height: 100dvh;
    padding: 90px 0 28px 24px;
    transform: translateX(-105%);
    border-right: 1px solid rgba(230, 199, 142, 0.22);
    background: rgba(4, 4, 4, 0.98);
    box-shadow: 24px 0 80px rgba(0, 0, 0, 0.8);
    transition: transform 240ms cubic-bezier(0.23, 1, 0.32, 1);
  }

  .menu-open .chapter-sidebar {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    position: fixed;
    z-index: 110;
    inset: 0;
    display: block;
    visibility: hidden;
    border: 0;
    opacity: 0;
    background: rgba(0, 0, 0, 0.7);
    transition: opacity 200ms ease, visibility 200ms ease;
  }

  .menu-open .sidebar-backdrop {
    visibility: visible;
    opacity: 1;
  }

  .menu-open {
    overflow: hidden;
  }

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

@media (max-width: 620px) {
  body {
    min-width: 0;
  }

  .brand img {
    width: 32px;
    height: 32px;
  }

  .brand small {
    display: none;
  }

  .reader-shell {
    padding: 0 18px;
  }

  .document-masthead h1,
  html[lang="zh-CN"] .document-masthead h1 {
    font-size: clamp(39px, 13vw, 58px);
  }

  .document-content {
    font-size: 16px;
    line-height: 1.8;
  }

  .document-content h2 {
    font-size: 28px;
  }

  .document-figure {
    width: calc(100% + 20px);
    margin-left: -10px;
    padding: 8px;
  }

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

  .pagination-link.next {
    text-align: left;
  }

  .document-footer {
    display: grid;
  }

  .landing-hero {
    --landing-cover-height: clamp(240px, 70vw, 300px);
    min-height: 0;
  }

  .landing-hero::before {
    inset: 0 0 auto;
    height: var(--landing-cover-height);
    background: linear-gradient(0deg, #050505 0%, rgba(0, 0, 0, 0.72) 48%, rgba(0, 0, 0, 0.08) 100%);
  }

  .landing-visual {
    inset: 0 0 auto;
    height: var(--landing-cover-height);
  }

  .landing-visual img {
    height: 100%;
    object-position: 69% center;
  }

  .landing-copy {
    display: grid;
    width: 100%;
    padding: 0;
  }

  .landing-heading {
    display: flex;
    min-height: var(--landing-cover-height);
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px 20px;
  }

  .landing-heading .eyebrow {
    margin-bottom: 16px;
  }

  .landing-copy h1,
  html[lang="zh-CN"] .landing-copy h1 {
    font-size: clamp(34px, 9.5vw, 44px);
    letter-spacing: -0.025em;
    line-height: 1.08;
  }

  .landing-source {
    max-width: none;
    margin-top: 0;
    padding: 24px 20px 0;
    font-size: 16px;
  }

  .landing-source p {
    margin-bottom: 12px;
  }

  .landing-copy .primary-action {
    justify-self: start;
    margin: 14px 20px 28px;
  }

  .chapter-grid a {
    min-height: 80px;
  }

  .search-dialog {
    width: calc(100vw - 20px);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}