/* ============================================================
   安装娱乐殿 · /assets/site.css
   共享外壳：深空黑底 / 神殿金强调 / 夜间神殿视觉语言
   ============================================================ */

:root{
  --void:#07080C;
  --plinth:#10131B;
  --colonnade:#1B1F2B;
  --stroke:#2C3140;
  --gold:#E8B54A;
  --gold-deep:#8A6620;
  --violet:#8B5CF6;
  --electric:#38D6F5;
  --warm:#F4F1E8;
  --ash:#A8A291;

  --warm-86:rgba(244,241,232,.86);
  --warm-72:rgba(244,241,232,.72);
  --warm-56:rgba(244,241,232,.56);
  --gold-40:rgba(232,181,74,.40);
  --gold-16:rgba(232,181,74,.16);
  --stroke-soft:rgba(44,49,64,.72);

  --shell:1320px;
  --gutter:clamp(20px,4vw,48px);
  --section-gap:clamp(64px,9vw,120px);
  --header-h:74px;

  --r-xs:4px;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:28px;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-index:"Noto Sans SC Condensed","Arial Narrow","PingFang SC",var(--font-body);
  --font-num:ui-monospace,"SFMono-Regular","Consolas",monospace;

  --ease:cubic-bezier(.22,1,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  background:var(--void);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body{
  margin:0;
  background:transparent;
  color:var(--warm);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
strong{font-weight:500}
::selection{background:rgba(232,181,74,.28);color:var(--warm)}
:focus-visible{outline:2px solid var(--electric);outline-offset:3px;border-radius:var(--r-xs)}
a:focus:not(:focus-visible),button:focus:not(:focus-visible){outline:none}

/* ---------- 背景层：光柱、暗紫余晖、细噪点 ---------- */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(120% 68% at 50% 0%, rgba(232,181,74,.10), rgba(7,8,12,0) 62%),
    radial-gradient(78% 58% at 86% 12%, rgba(139,92,246,.09), rgba(7,8,12,0) 62%),
    radial-gradient(70% 50% at 8% 78%, rgba(56,214,245,.05), rgba(7,8,12,0) 66%);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.5;
  background-image:radial-gradient(rgba(244,241,232,.05) 1px, transparent 1px);
  background-size:4px 4px;
}

/* ---------- 排版 ---------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
  line-height:1.6;
}
.display-title{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(46px,8.5vw,128px);
  line-height:1.05;
  letter-spacing:.04em;
  color:var(--warm);
}
.page-head{
  padding-block:calc(var(--header-h) + clamp(48px,9vw,120px)) clamp(40px,6vw,72px);
}
.page-head .eyebrow{margin-bottom:22px}
.page-head .display-title{max-width:18ch}
.page-lede{
  max-width:56ch;
  margin-top:clamp(20px,3vw,32px);
  color:var(--warm-72);
  font-size:clamp(16px,1.15vw,18px);
}
.prose{
  max-width:70ch;
  color:var(--warm-86);
}
.prose p + p{margin-top:1.4em}
.prose a{color:var(--electric);border-bottom:1px solid rgba(56,214,245,.45)}
.prose h2,.prose h3{
  font-family:var(--font-display);
  font-weight:300;
  letter-spacing:.04em;
  line-height:1.2;
  color:var(--warm);
}
.prose h2{font-size:clamp(26px,3vw,38px);margin-top:2.2em}
.prose h3{font-size:clamp(20px,2vw,26px);margin-top:1.8em}
.prose ul,.prose ol{margin-top:1.1em;padding-left:0}
.prose li{position:relative;padding-left:1.6em;margin-top:.6em}
.prose li::before{
  content:"";
  position:absolute;
  left:0;top:.85em;
  width:8px;height:1px;
  background:var(--gold-40);
}
.lede{color:var(--warm-72);font-size:clamp(16px,1.1vw,18px);max-width:58ch}
.note{color:var(--ash);font-size:14px;letter-spacing:.02em}
.num{font-family:var(--font-num);font-weight:500;letter-spacing:.25em}

/* ---------- 容器与栅格 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  position:relative;
  padding-block:var(--section-gap);
}
.section[id],[data-spy][id]{scroll-margin-top:calc(var(--header-h) + 32px)}
.section--tight{padding-block:clamp(40px,5vw,64px)}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:14px 22px;
  margin-bottom:clamp(28px,4vw,48px);
}
.section-index{
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.25em;
  color:var(--gold);
}
.section-title{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(26px,3.4vw,46px);
  line-height:1.15;
  letter-spacing:.05em;
}
.section-head .note{margin-left:auto}
.stack{display:flex;flex-direction:column;gap:clamp(20px,3vw,32px)}
.grid-2{display:grid;gap:clamp(16px,2vw,24px);grid-template-columns:1fr}
.grid-3{display:grid;gap:clamp(16px,2vw,24px);grid-template-columns:1fr}
@media (min-width:768px){
  .grid-2{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1024px){
  .grid-3{grid-template-columns:repeat(3,1fr)}
}

/* ---------- 装饰层 ---------- */
.light-column{
  position:absolute;
  inset-block:0;
  left:50%;
  width:clamp(80px,14vw,220px);
  transform:translateX(-50%);
  pointer-events:none;
  background:linear-gradient(180deg,
    rgba(232,181,74,0) 0%,
    rgba(232,181,74,.22) 38%,
    rgba(232,181,74,.06) 74%,
    rgba(232,181,74,0) 100%);
  filter:blur(20px);
}
.grain{position:relative}
.grain::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.45;
  background-image:radial-gradient(rgba(244,241,232,.06) 1px, transparent 1px);
  background-size:4px 4px;
}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:120;
  padding:12px 20px;
  border-radius:999px;
  background:var(--gold);
  color:var(--void);
  font-size:14px;
  letter-spacing:.06em;
  transform:translateY(-160%);
  transition:transform .28s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:60;
  border-bottom:1px solid transparent;
  background:linear-gradient(180deg, rgba(7,8,12,.88) 0%, rgba(7,8,12,.42) 62%, rgba(7,8,12,0) 100%);
  transition:background .38s var(--ease), border-color .38s var(--ease), box-shadow .38s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:rgba(16,19,27,.97);
  border-bottom-color:var(--stroke);
  box-shadow:0 24px 48px -38px rgba(0,0,0,.95);
}
.header-rail{
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:12px var(--gutter);
  min-height:var(--header-h);
}
.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}
.brand-mark{
  position:relative;
  display:grid;
  place-items:center;
  width:36px;height:36px;
  border:1px solid var(--gold-40);
  border-radius:14px 4px 14px 4px;
  background:radial-gradient(120% 130% at 50% 118%, rgba(232,181,74,.30), rgba(232,181,74,0) 72%);
}
.brand-pillar{
  display:block;
  width:2px;height:16px;
  background:linear-gradient(180deg, rgba(232,181,74,0) 0%, var(--gold) 100%);
  box-shadow:0 0 12px rgba(232,181,74,.75);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{
  font-family:var(--font-display);
  font-weight:300;
  font-size:19px;
  letter-spacing:.10em;
  color:var(--warm);
}
.brand-meta{
  font-family:var(--font-index);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--ash);
  margin-top:2px;
}
.brand--footer .brand-name{font-size:21px}

/* 主导航（移动端整屏抽屉） */
.site-nav{
  position:fixed;
  inset:0;
  z-index:70;
  display:flex;
  flex-direction:column;
  gap:28px;
  padding:calc(var(--header-h) + 26px) var(--gutter) 40px;
  overflow-y:auto;
  background:rgba(7,8,12,.97);
  -webkit-backdrop-filter:blur(18px);
  backdrop-filter:blur(18px);
  opacity:0;
  visibility:hidden;
  transform:translateY(-10px);
  transition:opacity .34s var(--ease), transform .34s var(--ease), visibility .34s var(--ease);
}
.site-nav[data-open="true"]{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}
html[data-nav-open] body{overflow:hidden}
.nav-list{
  display:flex;
  flex-direction:column;
  gap:2px;
  counter-reset:navcount;
}
.nav-item{counter-increment:navcount}
.nav-link{
  display:flex;
  align-items:baseline;
  gap:16px;
  padding:15px 2px;
  font-family:var(--font-display);
  font-weight:300;
  font-size:26px;
  letter-spacing:.06em;
  color:var(--warm);
  border-bottom:1px solid var(--stroke-soft);
  transition:color .28s var(--ease), border-color .28s var(--ease);
}
.nav-link::before{
  content:counter(navcount, decimal-leading-zero);
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--gold-deep);
}
.nav-link:hover{color:var(--gold)}
.nav-link[aria-current="page"]{color:var(--gold)}
.nav-foot{
  display:flex;
  flex-direction:column;
  gap:18px;
  margin-top:auto;
}
.nav-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  align-self:flex-start;
  padding:13px 26px;
  border:1px solid var(--gold-40);
  border-radius:999px;
  background:rgba(232,181,74,.07);
  color:var(--gold);
  font-size:15px;
  letter-spacing:.04em;
  transition:background .3s var(--ease), color .3s var(--ease);
}
.nav-cta:hover{background:var(--gold);color:var(--void)}
.nav-note{
  font-size:12px;
  line-height:1.8;
  letter-spacing:.04em;
  color:var(--ash);
}

/* 桌面端横向导航 */
@media (min-width:1024px){
  .site-nav{
    position:static;
    inset:auto;
    flex-direction:row;
    align-items:center;
    gap:2px;
    margin-inline:auto;
    padding:0;
    overflow:visible;
    background:none;
    -webkit-backdrop-filter:none;
    backdrop-filter:none;
    opacity:1;
    visibility:visible;
    transform:none;
    transition:none;
  }
  .nav-list{flex-direction:row;gap:2px;counter-reset:none}
  .nav-item{counter-increment:none}
  .nav-link{
    position:relative;
    display:inline-flex;
    gap:0;
    padding:9px 13px;
    border-bottom:0;
    border-radius:999px;
    font-family:var(--font-body);
    font-size:14px;
    letter-spacing:.03em;
    color:var(--warm-72);
  }
  .nav-link::before{content:none}
  .nav-link:hover{color:var(--warm);background:rgba(232,181,74,.08)}
  .nav-link[aria-current="page"]{color:var(--gold)}
  .nav-link[aria-current="page"]::after{
    content:"";
    position:absolute;
    left:13px;right:13px;bottom:3px;
    height:1px;
    background:var(--gold);
  }
  .nav-foot{display:none}
  .header-cta{
    display:inline-flex;
    align-items:center;
    padding:9px 18px;
    border:1px solid var(--gold-40);
    border-radius:999px;
    font-size:14px;
    letter-spacing:.04em;
    color:var(--gold);
    white-space:nowrap;
    transition:background .3s var(--ease), color .3s var(--ease);
  }
  .header-cta:hover{background:var(--gold);color:var(--void)}
  .header-actions{margin-left:0}
}
@media (max-width:1023px){
  .header-cta{display:none}
}

/* 移动导航按钮 */
.nav-toggle{
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:5px;
  padding:9px 13px;
  border:1px solid var(--stroke);
  border-radius:14px;
  color:var(--warm);
  transition:border-color .3s var(--ease), background .3s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold-40);background:rgba(232,181,74,.07)}
.nav-toggle-bar{
  display:block;
  width:20px;height:1px;
  background:var(--warm);
  transition:transform .3s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-of-type(1){transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-of-type(2){transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-label{
  font-family:var(--font-index);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--ash);
}
@media (min-width:1024px){
  .nav-toggle{display:none}
}

/* 阅读进度 */
.header-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  display:block;
  height:2px;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg, var(--gold-deep), var(--gold) 55%, var(--electric));
  opacity:.9;
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:2;
  margin-top:clamp(72px,10vw,140px);
  background:var(--plinth);
  border-top:1px solid var(--stroke);
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(32px,5vw,56px);
  padding-block:clamp(56px,8vw,96px) clamp(36px,5vw,64px);
}
.footer-brand{display:flex;flex-direction:column;gap:18px;align-items:flex-start}
.footer-lede{
  max-width:44ch;
  color:var(--warm-72);
  font-size:15px;
  line-height:1.9;
}
.footer-lede--sub{
  color:var(--ash);
  font-size:13px;
  letter-spacing:.03em;
}
.footer-title{
  font-family:var(--font-index);
  font-size:12px;
  font-weight:400;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
  margin-bottom:16px;
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  font-size:15px;
  color:var(--warm-72);
  transition:color .28s var(--ease);
}
.footer-link:hover{color:var(--gold)}
.footer-contact .footer-list{gap:12px}
.contact-item{display:flex;flex-direction:column;gap:2px}
.contact-label{
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--ash);
}
.contact-value{
  font-size:15px;
  color:var(--warm-86);
  word-break:break-all;
}
.footer-note{
  margin-top:16px;
  max-width:34ch;
  font-size:13px;
  line-height:1.9;
  color:var(--ash);
}
.footer-base{
  display:grid;
  gap:18px;
  padding-bottom:clamp(28px,4vw,44px);
}
.footer-rule{
  display:block;
  height:1px;
  background:linear-gradient(90deg,
    rgba(232,181,74,0) 0%,
    rgba(232,181,74,.65) 38%,
    rgba(232,181,74,.20) 72%,
    rgba(232,181,74,0) 100%);
}
.footer-base-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 24px;
}
.footer-legal{
  font-size:13px;
  letter-spacing:.03em;
  color:var(--ash);
}
.footer-icp{color:var(--warm-56)}
.footer-top-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 16px;
  border:1px solid var(--gold-40);
  border-radius:999px;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--gold);
  background:rgba(232,181,74,.05);
  transition:background .3s var(--ease), color .3s var(--ease);
}
.footer-top-link:hover{background:var(--gold);color:var(--void)}

/* 悬浮返回顶部 */
.to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:clamp(16px,3vw,32px);
  z-index:55;
  display:grid;
  place-items:center;
  width:48px;height:48px;
  border:1px solid var(--gold-40);
  border-radius:999px;
  background:rgba(16,19,27,.82);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .34s var(--ease), transform .34s var(--ease), visibility .34s var(--ease), border-color .3s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{border-color:var(--gold)}
.to-top-glyph{
  display:block;
  width:2px;height:15px;
  background:linear-gradient(180deg, rgba(232,181,74,0), var(--gold));
  box-shadow:0 0 10px rgba(232,181,74,.8);
  position:relative;
}
.to-top-glyph::before{
  content:"";
  position:absolute;
  top:-1px;left:-3px;
  width:8px;height:8px;
  border-top:1px solid var(--gold);
  border-left:1px solid var(--gold);
  transform:rotate(45deg);
}

/* 页脚栅格升级 */
@media (min-width:768px){
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  .footer-grid{
    grid-template-columns:1.7fr 1fr 1fr 1.25fr;
    gap:clamp(32px,4vw,64px);
  }
  .footer-brand{grid-column:auto}
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 26px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:15px;
  letter-spacing:.04em;
  line-height:1.4;
  transition:background .3s var(--ease), color .3s var(--ease), border-color .3s var(--ease), transform .3s var(--ease);
}
.btn--gold{background:var(--gold);color:#0A0A0C}
.btn--gold:hover{background:#F2C566}
.btn--ghost{
  border-color:var(--gold-40);
  background:rgba(232,181,74,.07);
  color:var(--gold);
}
.btn--ghost:hover{background:var(--gold);color:var(--void)}
.btn--quiet{
  border-color:var(--stroke);
  color:var(--warm-86);
}
.btn--quiet:hover{border-color:var(--electric);color:var(--electric)}

/* ---------- 面包屑 ---------- */
.crumbs{margin-block:0 clamp(20px,3vw,32px)}
.crumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs-item{display:inline-flex;align-items:center;gap:8px}
.crumbs-item + .crumbs-item::before{
  content:"/";
  font-family:var(--font-index);
  font-size:11px;
  color:var(--stroke);
}
.crumbs-link{
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--ash);
  transition:color .28s var(--ease);
}
.crumbs-link:hover{color:var(--gold)}
.crumbs-current{
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--gold);
}

/* ---------- Bento ---------- */
.bento{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:clamp(12px,1.6vw,20px);
}
.bento-cell{
  grid-column:span 12;
  position:relative;
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:clamp(22px,3vw,36px);
  border:1px solid var(--stroke);
  border-radius:var(--r-lg);
  background:var(--colonnade);
  transition:border-color .35s var(--ease), background .35s var(--ease);
}
.bento-cell:hover{border-color:var(--gold-40)}
.bento-cell--focus{
  border-radius:4px 28px 28px 28px;
  background:
    radial-gradient(120% 120% at 50% 118%, rgba(232,181,74,.18), rgba(232,181,74,0) 68%),
    var(--colonnade);
}
@media (min-width:768px){
  .bento-cell{grid-column:span 6}
  .bento-cell--wide{grid-column:span 12}
  .bento-cell--tall{grid-row:span 2}
  .bento-cell--focus{grid-column:span 12}
}
@media (min-width:1024px){
  .bento-cell--focus{grid-column:span 8;grid-row:span 2}
  .bento-cell--wide{grid-column:span 8}
}

/* ---------- 资料卡 ---------- */
.card{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:clamp(20px,2.6vw,30px);
  border:1px solid var(--stroke-soft);
  border-radius:18px 6px 18px 6px;
  background:rgba(27,31,43,.55);
  transition:border-color .35s var(--ease), background .35s var(--ease);
}
.card:hover{border-color:var(--gold-40);background:rgba(27,31,43,.82)}
.card-index{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.25em;
  color:var(--gold);
}
.card-title{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(19px,1.8vw,24px);
  line-height:1.3;
  letter-spacing:.05em;
}
.card-body{color:var(--warm-72);font-size:15px;line-height:1.85}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border:1px solid var(--stroke);
  border-radius:999px;
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ash);
}
.tag--gold{border-color:var(--gold-40);color:var(--gold);background:rgba(232,181,74,.07)}
.tag--violet{border-color:rgba(139,92,246,.45);color:#C4ACFB;background:rgba(139,92,246,.10)}
.tag--electric{border-color:rgba(56,214,245,.45);color:var(--electric);background:rgba(56,214,245,.08)}

/* ---------- 章节目录轨 ---------- */
.rail{display:none}
@media (min-width:1200px){
  .rail{
    display:block;
    position:sticky;
    top:calc(var(--header-h) + 40px);
    align-self:start;
    width:210px;
    flex:0 0 210px;
  }
}
.rail-list{
  display:flex;
  flex-direction:column;
  gap:2px;
  border-left:1px solid var(--stroke);
}
.rail-link{
  position:relative;
  display:block;
  padding:9px 0 9px 18px;
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--ash);
  transition:color .3s var(--ease);
}
.rail-link::before{
  content:"";
  position:absolute;
  left:-1px;top:6px;bottom:6px;
  width:1px;
  background:var(--gold);
  transform:scaleY(0);
  transform-origin:top center;
  transition:transform .35s var(--ease);
}
.rail-link:hover{color:var(--warm)}
.rail-link[aria-current="true"]{color:var(--gold)}
.rail-link[aria-current="true"]::before{transform:scaleY(1)}
.rail-progress{
  margin-top:18px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.25em;
  color:var(--stroke);
}

/* ---------- 折叠条目 ---------- */
.fold{border-top:1px solid var(--stroke)}
.fold-item{border-bottom:1px solid var(--stroke)}
.fold-summary{
  position:relative;
  display:block;
  padding:20px 44px 20px 22px;
  cursor:pointer;
  font-size:16px;
  line-height:1.7;
  color:var(--warm);
  list-style:none;
  transition:color .28s var(--ease);
}
.fold-summary::-webkit-details-marker{display:none}
.fold-summary::before{
  content:"";
  position:absolute;
  left:0;top:20px;bottom:20px;
  width:2px;
  background:var(--gold);
  transform:scaleY(0);
  transform-origin:top center;
  transition:transform .35s var(--ease);
}
.fold-summary::after{
  content:"+";
  position:absolute;
  right:14px;top:50%;
  transform:translateY(-50%);
  font-family:var(--font-num);
  font-size:16px;
  color:var(--gold);
  transition:transform .3s var(--ease);
}
.fold-item[open] .fold-summary::before{transform:scaleY(1)}
.fold-item[open] .fold-summary::after{transform:translateY(-50%) rotate(45deg)}
.fold-summary:hover{color:var(--gold)}
.fold-body{
  padding:0 44px 24px 22px;
  color:var(--warm-72);
  font-size:15px;
  line-height:1.9;
}
.fold-body p + p{margin-top:1.2em}

/* ---------- 检索示意 ---------- */
.search-demo{
  padding:clamp(20px,3vw,30px);
  border:1px solid var(--stroke);
  border-radius:var(--r-lg);
  background:rgba(27,31,43,.6);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}
.search-field{
  display:flex;
  align-items:center;
  gap:12px;
  padding-bottom:12px;
  border-bottom:1px solid var(--gold-40);
}
.search-field::before{
  content:"◎";
  color:var(--gold);
  font-size:12px;
}
.search-input{
  flex:1;
  min-width:0;
  background:transparent;
  border:0;
  outline:0;
  font-size:17px;
  color:var(--warm);
}
.search-input::placeholder{color:var(--ash)}
.search-count{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.25em;
  color:var(--electric);
}
.search-hits{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-top:18px;
}
.search-hit{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding:13px 16px;
  border:1px solid transparent;
  border-radius:14px;
  transition:background .32s var(--ease), border-color .32s var(--ease);
}
.search-hit[data-filtered="out"]{display:none}
.search-hit.is-hit{
  border-color:rgba(56,214,245,.35);
  background:linear-gradient(90deg, rgba(56,214,245,.14), rgba(56,214,245,0) 72%);
}
.search-hit-title{
  font-size:15px;
  color:var(--warm);
  transition:color .3s var(--ease);
}
.search-hit.is-hit .search-hit-title{color:var(--electric)}
.search-hit-meta{
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--ash);
}
.search-empty{
  margin-top:16px;
  font-size:14px;
  color:var(--ash);
}
.search-empty[hidden]{display:none}

/* ---------- 图片容器 ---------- */
.frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--stroke-soft);
  border-radius:var(--r-lg);
  background:var(--colonnade);
}
.frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(90% 70% at 50% 108%, rgba(232,181,74,.18), rgba(7,8,12,0) 72%);
}
.frame-media{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.frame--wide{aspect-ratio:16 / 9}
.frame--tall{aspect-ratio:3 / 4}
.frame--hero{aspect-ratio:21 / 9}
.frame-caption{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:1;
  padding:16px 20px;
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--warm-72);
  background:linear-gradient(0deg, rgba(7,8,12,.92), rgba(7,8,12,0) 100%);
}
@media (max-width:640px){
  .frame--hero{aspect-ratio:4 / 3}
  .frame--tall{aspect-ratio:4 / 5}
}

/* ---------- 入场显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .48s var(--ease), transform .48s var(--ease);
}
[data-reveal][data-in="true"]{opacity:1;transform:none}

/* ---------- 强调元素呼吸 ---------- */
@keyframes hall-breath{
  0%,100%{opacity:.78}
  50%{opacity:1}
}
.brand-pillar,
.header-progress,
.to-top-glyph{
  animation:hall-breath 6s ease-in-out infinite;
}

/* ---------- 减少动效 ---------- */
@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;
  }
  [data-reveal]{opacity:1;transform:none}
}

/* ---------- 小屏微调 ---------- */
@media (max-width:480px){
  body{font-size:16px}
  .brand-name{font-size:17px}
  .brand-meta{display:none}
  .nav-link{font-size:22px;padding:13px 2px}
}