/* ===== 0. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}

/* ===== 1. Tokens ===== */
:root{
  --ink:#100E0D;
  --ink-2:#1C1917;
  --ink-3:#26211D;
  --red:#8C1D2C;
  --red-lit:#A52636;
  --red-deep:#4E0F19;
  --gold:#C9A227;
  --gold-light:#E7C873;
  --porcelain:#F5F1EA;
  --stone:#8C837A;
  --jade:#2E8F82;
  --jade-light:#3FA695;
  --line-gold:rgba(201,162,39,.30);
  --line-stone:rgba(140,131,122,.22);
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","Consolas","Courier New",monospace;
  --wrap:1200px;
  --wrap-wide:1360px;
  --gap:24px;
  --beam-h:66px;
}

/* ===== 2. Base & 中文排版 ===== */
body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  color:rgba(245,241,234,.86);
  background-color:var(--ink);
  background-image:
    radial-gradient(ellipse 90% 520px at 50% 0%, rgba(140,29,44,.34), transparent 70%),
    repeating-linear-gradient(90deg, rgba(201,162,39,.05) 0 1px, transparent 1px 96px),
    radial-gradient(circle at 12px 12px, rgba(201,162,39,.10) 1.3px, transparent 2px);
  background-size:100% 560px,auto,48px 48px;
  background-repeat:no-repeat,repeat,repeat;
  background-position:top center,0 0,0 0;
  min-height:100vh;
}
body::after{
  content:"";position:fixed;inset:0;z-index:40;pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(201,162,39,.16), inset 0 0 190px rgba(0,0,0,.55);
}
::selection{background:var(--red);color:var(--porcelain)}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:700;line-height:1.18;letter-spacing:.02em;color:var(--porcelain)}
h1{font-size:clamp(34px,5.4vw,68px)}
h2{font-size:clamp(25px,3vw,34px)}
h3{font-size:clamp(19px,2vw,22px)}
h4{font-size:17px}
strong{color:var(--porcelain)}
#main-content{scroll-margin-top:96px}
:focus-visible{outline:2px solid var(--gold-light);outline-offset:3px}

/* ===== 3. Layout ===== */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.wrap--wide{max-width:var(--wrap-wide)}
.wrap--narrow{max-width:820px}
.section{padding:72px 0}
.section--tight{padding:40px 0}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

/* ===== 4. Skip link ===== */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:90;
  background:var(--gold);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;
  padding:10px 16px;transition:top .2s ease-out;
}
.skip-link:focus{top:12px}

/* ===== 5. Header / 宫门横梁 ===== */
.beam{
  position:sticky;top:0;z-index:50;
  background:linear-gradient(180deg,#181410 0%, #100E0D 100%);
  border-bottom:1px solid var(--line-gold);
}
.beam__grid{
  width:100%;max-width:var(--wrap-wide);margin:0 auto;
  padding:13px 24px;
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:22px;
  transition:padding .28s ease-out;
}
.beam__rule{display:none}
.beam::after{
  content:"";position:absolute;left:0;right:0;bottom:-3px;height:3px;
  background:linear-gradient(90deg,var(--red-deep) 0%, var(--red) 22%, var(--gold) 50%, var(--red) 78%, var(--red-deep) 100%);
  opacity:.85;
}
.beam[data-stuck] .beam__grid{padding-top:7px;padding-bottom:7px}
.beam[data-stuck]{box-shadow:0 24px 44px -34px #000}

.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__seal{
  display:grid;place-items:center;width:38px;height:38px;flex:0 0 auto;
  background:var(--red);color:#F1E2C4;border:1px solid var(--gold);
  font-family:var(--font-serif);font-size:19px;font-weight:700;line-height:1;
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.38);
}
.brand__meta{display:flex;flex-direction:column;line-height:1.25}
.brand__name{font-family:var(--font-serif);font-size:17px;font-weight:700;letter-spacing:.12em;color:var(--porcelain)}
.brand__line{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;color:var(--stone)}
.brand:hover .brand__name{color:var(--gold-light)}

.beam__nav{min-width:0}
.beam__list{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.beam__link{
  display:block;position:relative;
  font-family:var(--font-serif);font-size:15px;letter-spacing:.1em;
  color:rgba(245,241,234,.78);
  padding:10px 12px;border-bottom:2px solid transparent;
  transition:color .22s,border-color .22s,background .22s;
}
.beam__link:hover{color:var(--gold-light);border-bottom-color:var(--gold)}
.beam__link[aria-current="page"]{color:var(--gold-light);border-bottom-color:var(--gold)}
.beam__item--ask{margin-left:6px}
.beam__link--ask{
  border:1px solid var(--gold);border-bottom:1px solid var(--gold);
  color:var(--gold-light);font-size:14px;padding:8px 15px;
  background:rgba(201,162,39,.07);
}
.beam__link--ask:hover,.beam__link--ask[aria-current="page"]{background:var(--gold);color:var(--ink);border-color:var(--gold)}

.beam__side{display:flex;align-items:center;gap:12px}
.versions{display:flex;border:1px solid var(--line-gold);background:rgba(0,0,0,.34)}
.versions__btn{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;
  padding:8px 11px;color:var(--stone);
  border-right:1px solid var(--line-gold);
  transition:background .22s,color .22s;
}
.versions__btn:last-child{border-right:0}
.versions__btn:hover{color:var(--gold-light);background:rgba(201,162,39,.10)}
.versions__btn[aria-pressed="true"]{background:var(--red);color:var(--porcelain);box-shadow:inset 0 0 0 1px rgba(231,200,115,.45)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  border:1px solid var(--line-gold);padding:9px 12px;
  color:var(--gold-light);font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
}
.nav-toggle__bars{position:relative;display:block;width:18px;height:12px}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:100%;height:1.5px;background:currentColor;
  transition:transform .3s ease-out,top .3s ease-out;
}
.nav-toggle__bars::before{top:2px}
.nav-toggle__bars::after{top:9px}
.beam[data-open] .nav-toggle__bars::before{top:5.5px;transform:rotate(45deg)}
.beam[data-open] .nav-toggle__bars::after{top:5.5px;transform:rotate(-45deg)}

.beam__progress{
  position:absolute;left:0;bottom:-3px;height:3px;width:100%;z-index:2;
  background:linear-gradient(90deg,var(--gold-light),var(--jade-light));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
}

/* ===== 6. Breadcrumb ===== */
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--stone);
  padding:14px 0;border-bottom:1px solid var(--line-gold);
}
.crumb a{color:var(--jade-light)}
.crumb a:hover{color:var(--gold-light)}
.crumb__sep{color:rgba(201,162,39,.55)}
.crumb [aria-current="page"]{color:var(--porcelain)}

/* ===== 7. Text & label components ===== */
.kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--gold)}
.kicker::before{content:"[ ";color:var(--gold-light)}
.kicker::after{content:" ]";color:var(--gold-light)}
.lead{
  font-family:var(--font-serif);font-weight:600;
  font-size:clamp(18px,2vw,22px);line-height:1.7;color:var(--porcelain);max-width:56ch;
}
.note{font-size:13.5px;line-height:1.8;color:var(--stone);border-left:2px solid var(--line-gold);padding-left:14px}
.mono{font-family:var(--font-mono);letter-spacing:.06em}
.data{font-family:var(--font-mono);letter-spacing:.06em;color:var(--gold-light)}
.section-head{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,330px);gap:24px;align-items:end;
  padding-top:18px;border-top:2px solid var(--red);margin-bottom:30px;
}
.section-head__index{font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--gold)}
.section-head__title{font-family:var(--font-serif);font-size:clamp(24px,3vw,34px);color:var(--porcelain);margin-top:8px}
.section-head__desc{font-size:14px;line-height:1.8;color:var(--stone)}

/* ===== 8. Tags & buttons ===== */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  padding:4px 9px;border:1px solid var(--line-gold);color:var(--gold-light);
  background:rgba(201,162,39,.07);
}
.tag--jade{border-color:rgba(63,166,149,.5);color:#7FD5C6;background:rgba(46,143,130,.16)}
.tag--red{border-color:rgba(165,38,54,.85);color:var(--porcelain);background:rgba(140,29,44,.42)}
.tag--stone{border-color:var(--line-stone);color:var(--stone);background:transparent}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;
  padding:12px 20px;border:1px solid var(--line-gold);
  color:var(--porcelain);background:rgba(201,162,39,.06);
  transition:background .22s,color .22s,border-color .22s,transform .22s;
}
.btn:hover{background:var(--gold);color:var(--ink);border-color:var(--gold);transform:translateY(-1px)}
.btn--red{border-color:var(--red);background:var(--red);color:var(--porcelain)}
.btn--red:hover{background:var(--red-lit);border-color:var(--red-lit);color:var(--porcelain)}
.btn--ghost{background:transparent;border-color:var(--line-stone)}
.btn--ghost:hover{background:transparent;border-color:var(--gold);color:var(--gold-light)}
.btn--jade{border-color:rgba(63,166,149,.6);color:#8FDCCD;background:rgba(46,143,130,.16)}
.btn--jade:hover{background:var(--jade);color:var(--porcelain);border-color:var(--jade)}

/* ===== 9. Panels & cards（门钉母题） ===== */
.panel{background:var(--ink-2);border:1px solid var(--line-gold);box-shadow:inset 0 0 0 1px var(--line-stone),0 22px 46px -34px rgba(78,15,25,.95);padding:24px}
.card{
  position:relative;background:var(--ink-2);
  border:2px solid rgba(201,162,39,.42);
  box-shadow:inset 0 0 0 1px var(--line-stone),0 26px 50px -38px rgba(78,15,25,1);
  padding:26px 24px;
}
.card::after{
  content:"";position:absolute;inset:7px;pointer-events:none;
  background-image:
    radial-gradient(circle, rgba(201,162,39,.85) 0 1.4px, transparent 2px),
    radial-gradient(circle, rgba(201,162,39,.85) 0 1.4px, transparent 2px),
    radial-gradient(circle, rgba(201,162,39,.85) 0 1.4px, transparent 2px),
    radial-gradient(circle, rgba(201,162,39,.85) 0 1.4px, transparent 2px);
  background-position:left top,right top,left bottom,right bottom;
  background-repeat:no-repeat;background-size:4px 4px;
}
.card__label{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;color:var(--gold);display:block;margin-bottom:10px}
.card__title{font-family:var(--font-serif);font-size:20px;color:var(--porcelain);margin-bottom:10px}
.card__text{font-size:15px;color:rgba(245,241,234,.76)}

/* ===== 10. Status panel ===== */
.status{display:grid;grid-template-columns:repeat(auto-fit,minmax(178px,1fr));gap:1px;background:var(--line-stone);border:1px solid var(--line-gold)}
.status__cell{background:var(--ink-2);padding:18px 20px}
.status__label{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--stone)}
.status__value{font-family:var(--font-mono);font-size:19px;letter-spacing:.04em;color:var(--porcelain);margin-top:8px}
.status__value--gold{color:var(--gold-light)}
.status__dot{display:inline-block;width:8px;height:8px;margin-right:8px;vertical-align:middle;background:var(--jade-light);border-radius:50%;box-shadow:0 0 0 3px rgba(63,166,149,.18)}

/* ===== 11. Timeline ===== */
.timeline{position:relative;padding-left:28px}
.timeline::before{content:"";position:absolute;left:5px;top:6px;bottom:6px;width:2px;background:linear-gradient(180deg,var(--gold),var(--red))}
.timeline__item{position:relative;padding-bottom:26px}
.timeline__item::before{content:"";position:absolute;left:-28px;top:9px;width:10px;height:10px;background:var(--ink);border:2px solid var(--gold)}
.timeline__time{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--jade-light)}
.timeline__title{font-family:var(--font-serif);font-size:17px;color:var(--porcelain);margin:4px 0 6px}

/* ===== 12. Index list ===== */
.index-list{border-top:1px solid var(--line-gold)}
.index-row{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:20px;align-items:baseline;
  padding:18px 10px;border-bottom:1px solid var(--line-stone);
  transition:background .22s,transform .22s;
}
.index-row:hover{background:rgba(140,29,44,.18);transform:translateX(4px)}
.index-row__no{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--gold)}
.index-row__title{font-family:var(--font-serif);font-size:18px;color:var(--porcelain)}
.index-row__meta{font-family:var(--font-mono);font-size:12px;color:var(--stone);white-space:nowrap}

/* ===== 13. Rail（刻度式章节目录） ===== */
.rail{position:sticky;top:calc(var(--beam-h) + 28px);font-size:13px}
.rail__title{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--stone);margin-bottom:14px}
.rail__list{display:flex;flex-direction:column;border-left:1px solid var(--line-stone)}
.rail__item a{
  position:relative;display:block;padding:9px 0 9px 15px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--stone);
  transition:color .22s;
}
.rail__item a::before{
  content:"";position:absolute;left:-1px;top:0;bottom:0;width:2px;background:var(--gold);
  transform:scaleY(0);transform-origin:top center;transition:transform .32s ease-out;
}
.rail__item a:hover{color:var(--gold-light)}
.rail__item.is-current a{color:var(--gold-light)}
.rail__item.is-current a::before{transform:scaleY(1)}

/* ===== 14. Figure（图片基础容器） ===== */
.figure{position:relative;margin:0;border:2px solid var(--line-gold);background:var(--ink-2)}
.figure__frame{
  position:relative;aspect-ratio:16/9;overflow:hidden;
  background-image:
    radial-gradient(ellipse at 22% 18%, rgba(140,29,44,.55), transparent 62%),
    repeating-linear-gradient(135deg, rgba(201,162,39,.08) 0 2px, transparent 2px 14px);
  background-color:var(--ink-3);
}
.figure__frame img{width:100%;height:100%;object-fit:cover}
.figure__cap{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--stone);
  padding:10px 14px;border-top:1px solid var(--line-stone);
}
.figure--3x2 .figure__frame{aspect-ratio:3/2}
.figure--1x1 .figure__frame{aspect-ratio:1/1}
.figure--wide .figure__frame{aspect-ratio:21/9}

/* ===== 15. Fold ===== */
.fold{border-bottom:1px solid var(--line-stone);padding:20px 0}
.fold__body{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;font-size:15.5px}
.fold.is-open .fold__body{display:block;overflow:visible}
.fold__more{
  display:inline-block;margin-top:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--jade-light);
  border-bottom:1px dashed rgba(63,166,149,.55);
}
.fold__more:hover{color:var(--gold-light);border-bottom-color:var(--gold)}

/* ===== 16. Prose ===== */
.prose p{max-width:72ch;margin-bottom:1.1em}
.prose h2{margin:2.2em 0 .7em}
.prose h3{margin:1.8em 0 .6em}
.prose ul{margin:0 0 1.2em}
.prose li{position:relative;padding-left:20px;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:9px;height:1px;background:var(--gold)}
.prose a{color:var(--jade-light);border-bottom:1px solid rgba(63,166,149,.45)}
.prose a:hover{color:var(--gold-light);border-bottom-color:var(--gold)}
.prose blockquote{
  border-left:2px solid var(--red);padding:4px 0 4px 18px;margin:1.6em 0;
  font-family:var(--font-serif);font-size:17px;color:var(--porcelain);
}

/* ===== 17. Reveal ===== */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .5s ease-out,transform .5s ease-out;transition-delay:calc(var(--i,0) * 60ms)}
.reveal.is-in{opacity:1;transform:none}

/* ===== 18. Footer ===== */
.palace-foot{
  position:relative;margin-top:96px;border-top:2px solid var(--gold);
  background:linear-gradient(180deg,#151110 0%, #100E0D 38%, #360A12 100%);
}
.palace-foot::before{
  content:"";position:absolute;top:0;left:0;right:0;height:7px;opacity:.65;
  background-image:radial-gradient(circle at 7px 3.5px, rgba(201,162,39,.55) 1.6px, transparent 2px);
  background-size:28px 7px;
}
.palace-foot__inner{max-width:var(--wrap-wide);margin:0 auto;padding:58px 24px 0}
.palace-foot__top{display:grid;grid-template-columns:1.35fr repeat(4,minmax(0,1fr));gap:32px}
.palace-foot__brand .brand{margin-bottom:16px}
.palace-foot__note{font-size:14px;line-height:1.8;color:var(--stone);max-width:34ch}
.palace-foot__stamp{margin-top:14px;font-size:11.5px;letter-spacing:.16em;color:rgba(201,162,39,.75)}

.foot-col__title{
  font-family:var(--font-serif);font-size:15px;font-weight:600;letter-spacing:.1em;
  color:var(--gold-light);padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid var(--line-gold);
}
.foot-col__list li a{
  display:block;padding:7px 0;font-size:14.5px;color:rgba(245,241,234,.62);
  transition:color .2s,padding-left .2s;
}
.foot-col__list li a:hover{color:var(--gold-light);padding-left:7px}

.palace-foot__contact{
  margin-top:48px;padding:24px;border:1px solid var(--line-gold);background:rgba(0,0,0,.30);
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;
}
.contact-cell{display:flex;flex-direction:column;gap:6px}
.contact-cell__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--stone)}
.contact-cell__value{font-family:var(--font-mono);font-size:14.5px;letter-spacing:.04em;color:var(--porcelain);word-break:break-word}
.contact-cell--wide{
  grid-column:1/-1;display:block;font-size:13.5px;line-height:1.8;color:var(--jade-light);
  border-top:1px dashed var(--line-stone);padding-top:16px;
}
.palace-foot__legal{
  margin-top:38px;padding:20px 0 42px;border-top:1px solid var(--line-stone);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
}
.palace-foot__fine{font-size:13px;color:var(--stone)}
.backtop{
  display:inline-flex;align-items:center;gap:10px;
  border:1px solid var(--gold);background:rgba(201,162,39,.06);color:var(--gold-light);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;padding:9px 15px;
  transition:background .25s,color .25s,transform .25s;
}
.backtop:hover{background:var(--gold);color:var(--ink);transform:translateY(-2px)}

/* ===== 19. Responsive ===== */
@media (max-width:1180px){
  .beam__grid{gap:14px;padding-left:18px;padding-right:18px}
  .beam__link{font-size:14px;padding:10px 9px}
  .palace-foot__top{grid-template-columns:1.2fr repeat(2,minmax(0,1fr));gap:28px}
}
@media (max-width:900px){
  body{font-size:16.5px}
  .beam__grid{grid-template-columns:1fr auto;padding:10px 16px;gap:12px}
  .beam__nav{
    grid-column:1/-1;max-height:0;overflow:hidden;
    transition:max-height .34s ease-out;border-top:1px solid transparent;
  }
  .beam[data-open] .beam__nav{max-height:74vh;overflow-y:auto;border-top-color:var(--line-gold);padding-top:8px}
  .beam__list{flex-direction:column;align-items:stretch;gap:0}
  .beam__link{padding:13px 2px;border-bottom:1px solid var(--line-stone);font-size:15.5px}
  .beam__link:hover{border-bottom-color:var(--line-stone)}
  .beam__item--ask{margin-left:0;margin-top:12px}
  .beam__link--ask{padding:12px 16px}
  .nav-toggle{display:inline-flex}
  .versions__btn{padding:7px 9px;font-size:11px}
  .grid-12{gap:18px}
  .span-3,.span-4,.span-5{grid-column:span 12}
  .span-6,.span-7,.span-8,.span-9{grid-column:span 12}
  .section-head{grid-template-columns:1fr}
  .section{padding:56px 0}
  .rail{position:static;top:auto}
}
@media (max-width:700px){
  .brand__line{display:none}
  .brand__name{font-size:16px}
  .palace-foot{margin-top:64px}
  .palace-foot__top{grid-template-columns:1fr;gap:26px}
  .palace-foot__note{max-width:none}
  .palace-foot__contact{padding:18px}
  .index-row{grid-template-columns:auto minmax(0,1fr)}
  .index-row__meta{grid-column:2;white-space:normal}
  .palace-foot__legal{justify-content:flex-start}
}

/* ===== 20. Reduced 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;
  }
  .reveal{opacity:1!important;transform:none!important}
  .beam__progress{transition:none}
}