:root{
  --paper:#F6F0E4;
  --paper-card:#FBF7EE;
  --ink:#1E3A3A;
  --ink-deep:#242826;
  --cinnabar:#B6402E;
  --cinnabar-soft:#D97862;
  --indigo:#3C5A7A;
  --bamboo:#6F8B72;
  --gold:#C6A15B;
  --stone:#6B6B63;
  --edge:#DED2BC;
  --rail-w:232px;
  --topbar-h:64px;
  --gutter:clamp(20px,4vw,48px);
  --max:1280px;
  --font-title:"Source Han Serif SC","Noto Serif CJK SC","Songti SC","STSong","SimSun",serif;
  --font-sans:"Source Han Sans SC","Noto Sans CJK SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;
  --shadow-paper:6px 6px 0 rgba(222,210,188,.92);
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:24px;
}

body{
  margin:0;
  background-color:var(--paper);
  background-image:linear-gradient(180deg, rgba(198,161,91,.10), rgba(198,161,91,0) 420px);
  color:var(--ink-deep);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  text-rendering:optimizeLegibility;
}

body.is-nav-locked{overflow:hidden}

h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit}
table{border-collapse:collapse}

:focus-visible{
  outline:2px solid var(--cinnabar);
  outline-offset:2px;
  border-radius:1px;
}

/* ---------------- skip link ---------------- */
.skip-link{
  position:fixed;
  top:0;
  left:50%;
  transform:translate(-50%,-140%);
  z-index:200;
  padding:10px 22px;
  background:var(--ink);
  color:var(--paper-card);
  font-size:13px;
  letter-spacing:.12em;
  text-decoration:none;
  border-radius:0 0 2px 2px;
  transition:transform .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translate(-50%,0)}

/* ---------------- progress ---------------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:120;
  pointer-events:none;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--cinnabar),var(--gold));
}

/* ---------------- header shell ---------------- */
.site-header{position:relative;z-index:70}

/* ---------------- topbar (mobile) ---------------- */
.topbar{display:none}

/* ---------------- nav toggle ---------------- */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:8px 13px;
  border:1px solid var(--edge);
  border-radius:2px;
  background:var(--paper-card);
  color:var(--ink);
  font-size:13px;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .18s ease,background-color .18s ease;
}
.nav-toggle:hover{border-color:var(--gold);background:#fff}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:11px;
  border-top:1.5px solid currentColor;
  border-bottom:1.5px solid currentColor;
}
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:50%;
  height:1.5px;
  background:currentColor;
  transform:translateY(-50%);
}
.nav-toggle__text{line-height:1}
.nav-toggle[aria-expanded="true"]{
  border-color:var(--cinnabar);
  color:var(--cinnabar);
}

/* ---------------- side rail / drawer ---------------- */
.site-rail{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  z-index:80;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  padding:26px 20px 22px;
  background-color:var(--paper-card);
  background-image:linear-gradient(180deg, rgba(198,161,91,.14), rgba(198,161,91,0) 240px);
  border-right:1px solid var(--edge);
  box-shadow:1px 0 0 rgba(198,161,91,.45);
  overflow-y:auto;
  overscroll-behavior:contain;
}

.rail__head{padding-bottom:18px;border-bottom:1px solid var(--edge)}

.rail__brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--ink);
}
.rail__brandmark{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  background:var(--cinnabar);
  color:#FBF7EE;
  font-family:var(--font-title);
  font-weight:700;
  font-size:20px;
  border-radius:2px;
  box-shadow:2px 2px 0 rgba(30,58,58,.18);
}
.rail__brandtext{display:block;min-width:0}
.rail__brandname{
  display:block;
  font-family:var(--font-title);
  font-weight:700;
  font-size:16.5px;
  line-height:1.35;
  letter-spacing:.04em;
}
.rail__branddesc{
  display:block;
  margin-top:3px;
  font-size:10.5px;
  line-height:1.5;
  letter-spacing:.14em;
  color:var(--stone);
}

.rail__list{margin-top:14px;display:flex;flex-direction:column;gap:2px}

.rail__link{
  display:grid;
  grid-template-columns:24px minmax(0,1fr);
  column-gap:8px;
  align-items:baseline;
  padding:9px 10px 9px 8px;
  border-left:2px solid transparent;
  border-radius:2px;
  text-decoration:none;
  color:var(--ink);
  transition:background-color .18s ease,border-color .18s ease,transform .18s ease;
}
.rail__idx{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--stone);
}
.rail__label{font-size:14.5px;line-height:1.5;letter-spacing:.02em}
.rail__en{
  grid-column:2;
  font-family:var(--font-mono);
  font-size:9px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--stone);
}
.rail__link:hover{
  background:rgba(182,64,46,.07);
  border-left-color:var(--cinnabar-soft);
  transform:translateX(2px);
}
.rail__link[aria-current="page"]{
  background:rgba(182,64,46,.11);
  border-left-color:var(--cinnabar);
}
.rail__link[aria-current="page"] .rail__label{color:var(--cinnabar);font-weight:500}
.rail__link[aria-current="page"] .rail__idx{color:var(--cinnabar)}

.rail__foot{
  margin-top:auto;
  padding-top:18px;
  border-top:1px solid var(--edge);
  display:flex;
  flex-direction:column;
  gap:10px;
}
.rail__cta{
  display:block;
  padding:10px 12px;
  text-align:center;
  text-decoration:none;
  background:var(--ink);
  color:#FBF7EE;
  font-size:13px;
  letter-spacing:.1em;
  border-radius:2px;
  transition:background-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.rail__cta:hover{
  background:var(--cinnabar);
  transform:translateY(-1px);
  box-shadow:3px 3px 0 rgba(198,161,91,.5);
}
.rail__version{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--stone);
}
.rail__meta{
  font-size:10px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--stone);
}

.rail-scrim{display:none}

/* ---------------- main offset ---------------- */
main{
  display:block;
  padding-top:calc(var(--topbar-h) + clamp(18px,3vw,36px));
}

/* ---------------- footer ---------------- */
.site-footer{
  margin-top:clamp(56px,9vw,112px);
  background:var(--ink);
  background-image:linear-gradient(180deg, rgba(198,161,91,.14), rgba(198,161,91,0) 200px);
  color:#EDE6D6;
  border-top:3px solid var(--cinnabar);
}
.footer__inner{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding:clamp(38px,6vw,72px) var(--gutter) 26px;
}
.footer__top{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.9fr);
  gap:clamp(30px,5vw,72px);
}
.footer__brandlink{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:#FBF7EE;
}
.footer__seal{
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  background:var(--cinnabar);
  color:#FBF7EE;
  font-family:var(--font-title);
  font-weight:700;
  font-size:17px;
  border-radius:2px;
}
.footer__name{
  font-family:var(--font-title);
  font-weight:700;
  font-size:19px;
  letter-spacing:.05em;
}
.footer__summary{
  margin-top:16px;
  max-width:34ch;
  font-size:14.5px;
  line-height:1.9;
  color:rgba(246,240,228,.78);
}
.footer__note{
  margin-top:12px;
  max-width:34ch;
  padding-left:14px;
  border-left:1px solid rgba(198,161,91,.55);
  font-size:12.5px;
  line-height:1.8;
  color:rgba(246,240,228,.6);
}
.footer__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gold);
}
.footer__list{display:flex;flex-direction:column;gap:10px}
.footer__link{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  text-decoration:none;
  color:rgba(246,240,228,.8);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer__link:hover{
  color:#FBF7EE;
  border-bottom-color:var(--cinnabar-soft);
}
.footer__detail{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.9;
  letter-spacing:.02em;
  color:rgba(246,240,228,.68);
  word-break:break-word;
}
.footer__base{
  margin-top:clamp(30px,5vw,56px);
  padding-top:20px;
  border-top:1px solid rgba(246,240,228,.18);
  display:flex;
  flex-wrap:wrap;
  gap:10px 28px;
  justify-content:space-between;
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(246,240,228,.55);
}
.footer__legal,.footer__meta{margin:0}
.footer__meta{font-family:var(--font-mono)}

/* ---------------- layout primitives ---------------- */
.wrap{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(44px,7vw,92px)}
.section__en{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--stone);
}
.section__title{
  font-family:var(--font-title);
  font-weight:700;
  font-size:clamp(28px,3.6vw,40px);
  line-height:1.28;
  letter-spacing:.01em;
  color:var(--ink);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--stone);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:var(--gold);
}
.rule{border:0;border-top:1px solid var(--edge);margin-block:clamp(28px,4vw,56px)}
.rule--gold{border-top-color:var(--gold)}

.prose{
  max-width:62ch;
  font-size:17px;
  line-height:1.85;
  color:var(--ink-deep);
}
.prose > * + *{margin-top:1.05em}
.prose h2,.prose h3{
  font-family:var(--font-title);
  font-weight:700;
  line-height:1.35;
  color:var(--ink);
}
.prose h2{font-size:clamp(24px,2.6vw,30px)}
.prose h3{font-size:20px}
.prose ul,.prose ol{padding-left:1.3em;list-style:revert}
.prose li + li{margin-top:.4em}
.prose a{
  color:var(--cinnabar);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:3px;
}
.note{
  border-left:2px solid var(--gold);
  padding:6px 0 6px 16px;
  font-size:13.5px;
  line-height:1.8;
  color:var(--stone);
}

.grid{display:grid;gap:clamp(20px,2.6vw,36px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--aside{grid-template-columns:minmax(0,1fr) minmax(0,.42fr)}

/* ---------------- buttons ---------------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid var(--ink);
  border-radius:2px;
  background:transparent;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:14px;
  letter-spacing:.08em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.btn:hover{
  transform:translateY(-1px);
  box-shadow:3px 3px 0 rgba(198,161,91,.55);
}
.btn--solid{
  background:var(--cinnabar);
  border-color:var(--cinnabar);
  color:#FBF7EE;
}
.btn--solid:hover{background:#9E3527;border-color:#9E3527}
.btn--ghost{
  border-color:var(--edge);
  color:var(--ink);
  background:var(--paper-card);
}
.btn--ghost:hover{border-color:var(--gold)}
.btn--quiet{
  border:0;
  border-bottom:1px solid var(--cinnabar);
  border-radius:0;
  padding:6px 0;
  color:var(--cinnabar);
}
.btn--quiet:hover{box-shadow:none;transform:none;color:#9E3527}

/* ---------------- card ---------------- */
.card{
  position:relative;
  padding:clamp(20px,2.4vw,32px);
  background:var(--paper-card);
  border:1px solid var(--edge);
  border-radius:2px;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card:hover{
  transform:translate(-2px,-2px);
  box-shadow:var(--shadow-paper);
  border-color:var(--gold);
}
.card__label{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--stone);
}
.card__title{
  font-family:var(--font-title);
  font-weight:700;
  font-size:clamp(19px,2vw,23px);
  line-height:1.4;
  color:var(--ink);
}
.card__body{
  margin-top:10px;
  font-size:14.5px;
  line-height:1.8;
  color:var(--ink-deep);
}
.card__meta{
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--stone);
}

/* ---------------- tags ---------------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--edge);
  border-radius:2px;
  background:var(--paper);
  color:var(--stone);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.tag--zhu{background:var(--cinnabar);border-color:var(--cinnabar);color:#FBF7EE}
.tag--indigo{background:var(--indigo);border-color:var(--indigo);color:#FBF7EE}
.tag--bamboo{background:var(--bamboo);border-color:var(--bamboo);color:#FBF7EE}
.tag--gold{background:rgba(198,161,91,.22);border-color:var(--gold);color:var(--ink)}

.seal{
  display:inline-grid;
  place-items:center;
  width:34px;
  height:34px;
  background:var(--cinnabar);
  color:#FBF7EE;
  font-family:var(--font-title);
  font-weight:700;
  font-size:16px;
  border-radius:2px;
}

/* ---------------- breadcrumb ---------------- */
.breadcrumb{padding-block:18px 0}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--stone);
}
.breadcrumb__link{
  color:var(--stone);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.breadcrumb__link:hover{color:var(--cinnabar);border-bottom-color:currentColor}
.breadcrumb__sep{color:var(--edge)}
.breadcrumb__current{color:var(--ink)}

/* ---------------- ledger table ---------------- */
.ledger{width:100%;font-size:14.5px}
.ledger th{
  padding:12px 14px;
  border-bottom:1px solid var(--gold);
  text-align:left;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--stone);
}
.ledger td{
  padding:16px 14px;
  border-bottom:1px solid var(--edge);
  vertical-align:top;
  line-height:1.75;
}

/* ---------------- figure ---------------- */
.figure{margin:0}
.figure__frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:4 / 3;
  overflow:hidden;
  border:1px solid var(--edge);
  border-radius:2px;
  background:linear-gradient(150deg,#EFE7D8,#E3D9C6);
}
.figure__frame::after{
  content:"";
  position:absolute;
  inset:9px;
  border:1px solid rgba(198,161,91,.5);
  pointer-events:none;
}
.figure__img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure__caption{
  margin-top:10px;
  font-size:12.5px;
  line-height:1.7;
  letter-spacing:.02em;
  color:var(--stone);
}
.figure--wide .figure__frame{aspect-ratio:16 / 9}
.figure--portrait .figure__frame{aspect-ratio:3 / 4}

/* ---------------- tablet ---------------- */
@media (max-width:1023px){
  .topbar{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    position:fixed;
    top:0;
    left:0;
    right:0;
    height:var(--topbar-h);
    padding:0 16px;
    z-index:100;
    background:var(--paper-card);
    border-bottom:1px solid var(--edge);
    box-shadow:0 1px 0 rgba(198,161,91,.4);
  }
  .topbar__brand{
    display:inline-flex;
    align-items:center;
    gap:10px;
    text-decoration:none;
    color:var(--ink);
    min-width:0;
  }
  .topbar__seal{
    display:grid;
    place-items:center;
    flex:0 0 auto;
    width:30px;
    height:30px;
    background:var(--cinnabar);
    color:#FBF7EE;
    font-family:var(--font-title);
    font-weight:700;
    font-size:15px;
    border-radius:2px;
  }
  .topbar__title{
    font-family:var(--font-title);
    font-weight:700;
    font-size:15.5px;
    letter-spacing:.05em;
    white-space:nowrap;
    overflow:hidden;
    text-overflow:ellipsis;
  }

  .site-rail{
    z-index:120;
    width:min(88vw,330px);
    padding-top:22px;
    transform:translateX(-104%);
    transition:transform .24s ease;
    box-shadow:0 0 0 1px var(--edge);
  }
  .site-rail[data-open="true"]{
    transform:translateX(0);
    box-shadow:18px 0 44px rgba(30,58,58,.22);
  }
  .rail-scrim[data-visible="true"]{
    display:block;
    position:fixed;
    inset:0;
    z-index:110;
    background:rgba(30,58,58,.44);
  }

  .footer__top{grid-template-columns:1fr}
  .footer__cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* ---------------- desktop ---------------- */
@media (min-width:1024px){
  main,
  .site-footer{margin-left:var(--rail-w)}
  main{padding-top:clamp(20px,3vw,40px)}
  .scroll-progress{left:var(--rail-w)}
}

/* ---------------- small screens ---------------- */
@media (max-width:760px){
  body{font-size:16.5px}
  .grid--2,.grid--3,.grid--aside{grid-template-columns:1fr}
  .footer__cols{grid-template-columns:1fr 1fr}
  .footer__detail{font-size:11.5px}
  .ledger{display:block;overflow-x:auto}
  .section{padding-block:clamp(36px,9vw,56px)}
}

@media (max-width:420px){
  .footer__cols{grid-template-columns:1fr}
  .footer__base{flex-direction:column;align-items:flex-start}
}

/* ---------------- motion ---------------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .card:hover,
  .rail__link:hover,
  .rail__cta:hover,
  .btn:hover{transform:none}
}