:root {
  --ink: #231c16;
  --muted: #5c5348;
  --paper: #efe6d4;
  --sheet: #fffaf0;
  --rule: #c9b89a;
  --line: #e6d8be;
  --link: #1d4f5e;
  --link-hover: #0f3340;
  --ox: #7a2e2e;
  --ox-deep: #5c1f1f;
  --box: #f4ead4;
  --box-head: #e8d8b6;
  --cite: #7a2e2e;
  --focus: #1d4f5e;
  --ok: #2f5d3a;
  --warn: #7a4a12;
  --risk: #7a2e2e;
  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif CJK SC", Georgia, "Times New Roman", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --mono: "Cascadia Mono", "Sarasa Mono SC", "Consolas", ui-monospace, monospace;
  --wrap: 1180px;
  --toc: 212px;
  --info: 268px;
  --gap: 1.35rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 0, rgba(122, 46, 46, 0.05), transparent 28%),
    linear-gradient(180deg, #e8dcc4 0, var(--paper) 18rem);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}

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

a {
  color: var(--link);
  text-underline-offset: 0.18em;
}

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

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  z-index: 40;
  padding: 0.4rem 0.7rem;
  background: var(--sheet);
  color: var(--ink);
}

.skip:focus {
  top: 0.75rem;
}

.wrap {
  width: min(var(--wrap), calc(100% - 2rem));
  margin-inline: auto;
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mast {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--rule);
  background: rgba(255, 250, 240, 0.94);
}

.mast.is-stuck {
  box-shadow: 0 1px 0 var(--rule);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  object-fit: cover;
  border: 1px solid var(--rule);
  background: var(--box);
}

.brand span {
  display: flex;
  flex-direction: column;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.15;
}

.brand small {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--rule);
  background: var(--sheet);
  color: var(--ink);
  padding: 0.38rem 0.7rem;
  font: inherit;
  cursor: pointer;
}

.lane ul {
  display: flex;
  align-items: center;
  gap: 0.15rem 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.lane a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
}

.lane a:hover,
.lane a[aria-current="page"] {
  color: var(--ox);
  text-decoration: underline;
}

.lane .cta,
.acts .cta,
a.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.4rem;
  padding: 0.25rem 0.95rem;
  border: 1px solid var(--ox-deep);
  background: var(--ox);
  color: #fffaf0;
  text-decoration: none;
  font-weight: 600;
}

.lane .cta:hover,
.acts .cta:hover,
a.cta:hover {
  background: var(--ox-deep);
  color: #fffaf0;
}

.ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.4rem;
  padding: 0.25rem 0.95rem;
  border: 1px solid var(--rule);
  background: var(--sheet);
  color: var(--ink);
  text-decoration: none;
}

.ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.entry {
  padding: 1.6rem 0 2.4rem;
}

.crumbs {
  margin: 0 0 0.6rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.hat {
  margin: 0 0 0.85rem;
  padding: 0.55rem 0.75rem;
  border-left: 3px solid var(--ox);
  background: var(--box);
  color: var(--muted);
  font-size: 0.92rem;
}

.wiki-grid {
  display: grid;
  grid-template-columns: var(--toc) minmax(0, 1fr) var(--info);
  gap: 1.4rem 1.6rem;
  align-items: start;
}

.toc,
.infobox,
.sheet,
.card,
.os,
.ref-box,
.relate,
.entry-note,
.warn,
.risk,
.faq details {
  background: var(--sheet);
  border: 1px solid var(--rule);
}

.toc {
  position: sticky;
  top: 5rem;
  padding: 0.85rem 0.9rem 1rem;
}

.toc h2,
.infobox h2 {
  margin: 0 0 0.55rem;
  font-family: var(--serif);
  font-size: 0.95rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.15rem;
}

.toc li {
  margin: 0.28rem 0;
}

.toc a {
  text-decoration: none;
}

.toc a.is-current {
  color: var(--ox);
  font-weight: 600;
}

.article h1 {
  margin: 0 0 0.35rem;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.7rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.article h1::after {
  content: "";
  display: block;
  width: 4.2rem;
  height: 2px;
  margin-top: 0.55rem;
  background: var(--ox);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.85rem 0 0.7rem;
}

.tag {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--rule);
  background: var(--box);
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.tag.on {
  border-color: var(--ox);
  color: var(--ox);
}

.lead {
  margin: 0 0 1rem;
  color: var(--ink);
  font-size: 1.02rem;
}

.cite {
  font-size: 0.72em;
  font-weight: 600;
  line-height: 0;
}

.cite a {
  color: var(--cite);
  text-decoration: none;
}

.acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0 1.1rem;
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
  margin: 0 0 1.2rem;
}

.fact {
  padding: 0.7rem 0.75rem;
  border: 1px solid var(--line);
  background: var(--box);
}

.fact strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1.2;
}

.fact span {
  color: var(--muted);
  font-size: 0.84rem;
}

.chapter {
  margin: 1.8rem 0 0;
}

.chapter > h2 {
  display: flex;
  gap: 0.65rem;
  align-items: baseline;
  margin: 0 0 0.7rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--serif);
  font-size: 1.35rem;
}

.num {
  color: var(--ox);
  font-variant-numeric: tabular-nums;
  min-width: 1.6rem;
}

.infobox {
  padding: 0;
}

.infobox h2 {
  margin: 0;
  padding: 0.55rem 0.75rem;
  background: var(--box-head);
  border-bottom: 1px solid var(--rule);
  text-align: center;
}

.infobox figure {
  margin: 0;
  padding: 0.8rem 0.8rem 0.4rem;
  text-align: center;
}

.infobox img {
  width: 148px;
  height: 148px;
  object-fit: cover;
  border: 1px solid var(--rule);
}

.infobox figcaption {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.infobox dl {
  margin: 0;
  padding: 0.2rem 0.75rem 0.85rem;
}

.infobox div {
  display: grid;
  grid-template-columns: 5.4rem 1fr;
  gap: 0.35rem 0.5rem;
  padding: 0.38rem 0;
  border-top: 1px solid var(--line);
}

.infobox dt {
  color: var(--muted);
  font-size: 0.82rem;
}

.infobox dd {
  margin: 0;
  font-size: 0.9rem;
}

.seo-grid,
.quad,
.os-grid,
.pair {
  display: grid;
  gap: var(--gap);
}

.seo-grid,
.quad,
.os-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.card,
.os,
.entry-note,
.step {
  padding: 0.95rem 1rem 1.05rem;
}

.kicker {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--ox);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.card h3,
.os h3,
.step h3,
.entry-note h3,
.warn h3,
.risk h3 {
  margin: 0.15rem 0 0.4rem;
  font-family: var(--serif);
  font-size: 1.12rem;
}

.card p,
.os p,
.step p,
.entry-note p {
  margin: 0;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 1.3rem;
  align-items: center;
}

.shot {
  margin: 0;
  background: var(--sheet);
  border: 1px solid var(--rule);
}

.shot img {
  display: block;
  width: 100%;
  aspect-ratio: 880 / 700;
  object-fit: cover;
}

.shot figcaption {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.4rem 0.7rem;
  color: var(--muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--line);
}

.checks {
  margin: 0.6rem 0 0;
  padding-left: 1.15rem;
}

.checks li {
  margin: 0.28rem 0;
}

.warn,
.risk {
  padding: 0.85rem 1rem;
}

.warn {
  border-left: 3px solid var(--warn);
}

.risk {
  border-left: 3px solid var(--risk);
}

.cmd {
  margin: 0.6rem 0 0;
  padding: 0.45rem 0.6rem;
  background: #2b241c;
  color: #f4ead4;
  font-family: var(--mono);
  font-size: 0.84rem;
  overflow-wrap: anywhere;
}

.hash {
  margin-top: 0.6rem;
  padding: 0.5rem 0.6rem;
  border: 1px dashed var(--rule);
  color: var(--muted);
  font-size: 0.88rem;
}

.digest {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 1rem 0 0;
}

.digest div {
  padding: 0.65rem 0.7rem;
  background: var(--box);
  border: 1px solid var(--line);
}

.digest dt {
  color: var(--muted);
  font-size: 0.8rem;
}

.digest dd {
  margin: 0.15rem 0 0;
}

.faq details {
  margin: 0.55rem 0 0;
  padding: 0 0.9rem 0.15rem;
}

.faq summary {
  cursor: pointer;
  padding: 0.75rem 0;
  font-family: var(--serif);
  font-size: 1.05rem;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::before {
  content: "§ ";
  color: var(--ox);
}

.faq details p {
  margin: 0 0 0.85rem;
  color: var(--muted);
}

.ref-box,
.relate {
  padding: 0.9rem 1rem 1rem;
}

.ref-box ol,
.relate ul {
  margin: 0.35rem 0 0;
  padding-left: 1.2rem;
}

.relate ul {
  list-style: square;
}

.colophon {
  margin-top: 2rem;
  padding: 1.6rem 0 1.2rem;
  border-top: 2px solid var(--ox);
  background: #2b241c;
  color: #f4ead4;
}

.colophon a {
  color: #e8d8b6;
}

.colophon .brand {
  color: #fffaf0;
}

.colophon .brand img {
  background: var(--sheet);
}

.colophon h3 {
  margin: 0 0 0.45rem;
  font-family: var(--serif);
  font-size: 1rem;
}

.colophon p,
.colophon li {
  color: #d8c9ad;
}

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

.colophon li {
  margin: 0.22rem 0;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 1.2rem;
}

.legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.4rem 1rem;
  margin-top: 1.2rem;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(201, 184, 154, 0.35);
  color: #c9b89a;
  font-size: 0.86rem;
}

.page-lead {
  padding-top: 1.4rem;
}

[data-rise] {
  opacity: 1;
  transform: none;
}

.motion-ok [data-rise] {
  opacity: 0;
  transform: translateY(10px);
}

.motion-ok [data-rise].is-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.45s ease, transform 0.45s ease;
}

@media (max-width: 1040px) {
  .wiki-grid {
    grid-template-columns: minmax(0, 1fr) var(--info);
  }

  .toc {
    position: static;
    grid-column: 1 / -1;
  }

  .seo-grid,
  .quad,
  .os-grid,
  .digest,
  .foot-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
  }

  .lane {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--sheet);
    border-bottom: 1px solid var(--rule);
    padding: 0.6rem 1rem 0.9rem;
  }

  .lane.is-open {
    display: block;
  }

  .lane ul {
    flex-direction: column;
    align-items: flex-start;
  }

  body.nav-lock {
    overflow: hidden;
  }

  .wiki-grid,
  .split,
  .pair,
  .facts,
  .seo-grid,
  .quad,
  .os-grid,
  .digest,
  .foot-grid {
    grid-template-columns: 1fr;
  }

  .infobox {
    order: -1;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .motion-ok [data-rise] {
    opacity: 1;
    transform: none;
  }
}