/* ==========================================================================
   财神到游戏 · 共享站件样式  /assets/site.css
   语言：唐卡双线框景 · 经幡五色 · 鎏金刻度网格 · 编辑部错位节奏
   ========================================================================== */

/* 1 · 设计令牌 ----------------------------------------------------------- */
:root{
  --ink:#0E1A2B;
  --ink-2:#17293F;
  --ink-3:#1E3550;
  --gold:#D9A441;
  --gold-hi:#F3C868;
  --cinnabar:#C0352B;
  --cinnabar-hi:#DC463A;
  --butter:#F6DFA6;
  --flag-blue:#2AA79B;
  --flag-green:#3F8F63;
  --flag-green-hi:#6FC48F;
  --paper:#F4EFE6;
  --stone:#8C9AAA;
  --ink-black:#14100C;

  --gold-line:rgba(217,164,65,.34);
  --gold-line-strong:rgba(217,164,65,.62);
  --stone-line:rgba(140,154,170,.30);
  --paper-line:rgba(20,16,12,.18);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","SFMono-Regular","Roboto Mono",Menlo,Consolas,monospace;

  --fs-display:clamp(2.25rem,5.2vw,4.5rem);
  --fs-h1:clamp(1.75rem,3.4vw,3rem);
  --fs-h2:clamp(1.375rem,2.2vw,2rem);
  --fs-h3:clamp(1.125rem,1.6vw,1.5rem);
  --fs-body:1rem;
  --fs-small:.875rem;
  --fs-micro:.75rem;

  --flag-h:4px;
  --nav-h:72px;
  --strip-h:40px;
  --header-h:calc(var(--nav-h) + var(--strip-h) + var(--flag-h));

  --wrap:1280px;
  --gutter:clamp(16px,4vw,48px);
  --grid-gap:clamp(16px,2vw,24px);

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:420ms;
}

@media (max-width:900px){
  :root{--nav-h:60px;--strip-h:36px;}
}

/* 2 · 重置 --------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,figure{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0}
svg{display:block;max-width:100%}
:where(a,button,[tabindex]):focus-visible{
  outline:2px solid var(--gold-hi);
  outline-offset:3px;
  box-shadow:0 0 0 4px rgba(14,26,43,.9);
}
#main-content:focus{outline:none}
[id]{scroll-margin-top:calc(var(--header-h) + 16px)}

/* 3 · 中文排版基底 ------------------------------------------------------- */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:var(--fs-body);
  line-height:1.75;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(140,154,170,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,154,170,.055) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.22;
  letter-spacing:-.02em;
  color:var(--paper);
}
p{text-wrap:pretty}
strong{color:var(--gold-hi);font-weight:700}
.title-display{
  font-size:var(--fs-display);
  line-height:1.06;
  letter-spacing:-.03em;
  text-shadow:0 1px 0 rgba(243,200,104,.45),0 0 26px rgba(217,164,65,.22);
}
.title-h1{font-size:var(--fs-h1)}
.title-h2{font-size:var(--fs-h2)}
.title-h3{font-size:var(--fs-h3)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:var(--fs-micro);
  letter-spacing:.2em;text-transform:uppercase;color:var(--gold);
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--gold)}
.lede{
  max-width:62ch;
  font-size:clamp(1rem,1.4vw,1.125rem);
  line-height:1.8;
  color:rgba(244,239,230,.84);
}
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;
  margin:-1px;padding:0;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* 4 · 骨架容器 ----------------------------------------------------------- */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.site-main{display:block;padding-top:var(--header-h)}
.site-main--overlay{padding-top:0}
.section{padding:clamp(40px,6vw,88px) 0}
.section--tight{padding:clamp(24px,3.5vw,48px) 0}
.section--paper{background:var(--paper);color:var(--ink-black)}
.section--paper h1,.section--paper h2,.section--paper h3,.section--paper h4{color:var(--ink-black)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--grid-gap)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-6{grid-column:span 6}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

.layout-split{
  display:grid;
  grid-template-columns:minmax(160px,220px) minmax(0,1fr);
  gap:clamp(20px,3.4vw,48px);
  align-items:start;
}
.note-col{
  border-left:1px solid var(--gold-line);
  padding-left:16px;
  font-size:var(--fs-small);
  line-height:1.7;
  color:var(--stone);
}
.note-col__label{
  display:block;
  margin-bottom:6px;
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:.18em;
  color:var(--gold);
}

@media (max-width:900px){
  .span-3,.span-4,.span-6,.span-8,.span-9{grid-column:span 12}
  .layout-split{grid-template-columns:minmax(0,1fr)}
  .note-col{border-left:0;border-top:1px solid var(--gold-line);padding:10px 0 0}
}

/* 5 · 跳转链接与头部 ----------------------------------------------------- */
.skip-link{
  position:fixed;
  top:10px;left:50%;
  z-index:200;
  transform:translate(-50%,-180%);
  padding:12px 22px;
  font-size:var(--fs-small);
  font-weight:700;
  letter-spacing:.06em;
  color:var(--ink-black);
  background:var(--butter);
  border:2px solid var(--gold);
  text-decoration:none;
  transition:transform 200ms var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:100;
  color:var(--paper);
  background-color:transparent;
  background-image:linear-gradient(180deg,rgba(14,26,43,.9),rgba(14,26,43,.28) 72%,rgba(14,26,43,0));
  border-bottom:1px solid transparent;
  transition:background-color 240ms var(--ease),border-color 240ms var(--ease),box-shadow 240ms var(--ease);
}
.site-header[data-scrolled="true"],
.site-header[data-open="true"]{
  background-color:rgba(14,26,43,.97);
  background-image:none;
  border-bottom-color:var(--gold-line);
  box-shadow:0 24px 48px -34px rgba(0,0,0,.95);
}

.flag-band{display:flex;width:100%;height:var(--flag-h)}
.flag-band--footer{height:6px;border-bottom:1px solid rgba(14,26,43,.55)}
.flag-band__swatch{flex:1 1 auto}
.flag-band__swatch--blue{background:var(--flag-blue)}
.flag-band__swatch--white{background:var(--paper)}
.flag-band__swatch--red{background:var(--cinnabar)}
.flag-band__swatch--green{background:var(--flag-green)}
.flag-band__swatch--yellow{background:var(--gold-hi)}

.site-header__bar{padding:0 var(--gutter)}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,28px);
  min-height:var(--nav-h);
  max-width:var(--wrap);
  margin:0 auto;
  transition:min-height 240ms var(--ease);
}
@media (min-width:901px){
  .site-header[data-scrolled="true"] .site-header__inner{min-height:calc(var(--nav-h) - 10px)}
}

/* 品牌印章 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  text-decoration:none;
  color:inherit;
}
.brand__seal{
  display:grid;
  place-items:center;
  width:40px;height:40px;
  flex:0 0 auto;
  font-family:var(--font-display);
  font-weight:900;
  font-size:20px;
  line-height:1;
  color:var(--gold-hi);
  background-image:linear-gradient(155deg,#C0352B,#8C2216);
  border:1px solid var(--gold);
  box-shadow:
    inset 0 0 0 3px rgba(14,26,43,.55),
    inset 0 0 0 4px rgba(217,164,65,.6);
}
.brand__text{display:flex;flex-direction:column;gap:3px;line-height:1.15}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:1.0625rem;
  letter-spacing:.08em;
  color:var(--paper);
}
.brand__meta{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:var(--fs-micro);
  color:var(--stone);
}
.brand__tag{letter-spacing:.08em;white-space:nowrap}
.brand__ver{
  font-family:var(--font-mono);
  letter-spacing:.08em;
  color:var(--gold);
  border:1px solid var(--gold-line);
  padding:0 5px;
}
.brand--footer .brand__seal{width:48px;height:48px;font-size:24px}
.brand--footer .brand__name{font-size:1.25rem}

/* 移动端菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-width:44px;
  min-height:44px;
  margin-left:auto;
  padding:8px 12px;
  font-size:var(--fs-micro);
  letter-spacing:.16em;
  color:var(--paper);
  background:rgba(23,41,63,.7);
  border:1px solid var(--gold-line);
  cursor:pointer;
  transition:border-color 200ms var(--ease),color 200ms var(--ease);
}
.nav-toggle:hover{color:var(--gold-hi);border-color:var(--gold-line-strong)}
.nav-toggle__box{display:grid;gap:4px;width:18px}
.nav-toggle__line{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform 200ms var(--ease),opacity 200ms var(--ease);
}
.site-header[data-open="true"] .nav-toggle__line:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__line:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__line:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* 主导航 */
.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  margin-left:auto;
}
.site-nav__list{display:flex;align-items:center;gap:clamp(6px,1.4vw,20px)}
.site-nav__link{
  position:relative;
  display:inline-block;
  padding:12px 2px;
  font-size:.9375rem;
  letter-spacing:.05em;
  color:var(--paper);
  text-decoration:none;
  transition:color 200ms var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:6px;
  height:2px;
  background:var(--flag-blue);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 220ms var(--ease),background-color 220ms var(--ease);
}
.site-nav__link:hover{color:var(--gold-hi)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--gold-hi)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--gold)}
.site-nav__cta{display:none}
.header-cta{flex:0 0 auto}

/* 第二栏横向卷轴索引 */
.scroll-strip{
  position:relative;
  border-top:1px solid rgba(217,164,65,.18);
  border-bottom:1px solid rgba(217,164,65,.18);
  background-color:rgba(14,26,43,.55);
  background-image:repeating-linear-gradient(90deg,rgba(217,164,65,.16) 0,rgba(217,164,65,.16) 1px,transparent 1px,transparent 56px);
  transition:background-color 240ms var(--ease),border-color 240ms var(--ease);
}
.site-header[data-scrolled="true"] .scroll-strip{
  background-color:var(--ink-2);
  border-top-color:var(--gold-line);
  border-bottom-color:var(--gold-line);
}
.scroll-strip__inner{
  display:flex;
  align-items:center;
  gap:14px;
  max-width:var(--wrap);
  min-height:var(--strip-h);
  margin:0 auto;
  padding:0 var(--gutter);
  overflow-x:auto;
  overflow-y:hidden;
  scrollbar-width:thin;
  -webkit-overflow-scrolling:touch;
}
.scroll-strip__inner::-webkit-scrollbar{height:3px}
.scroll-strip__inner::-webkit-scrollbar-thumb{background:var(--gold-line-strong)}
.scroll-strip__label{
  flex:0 0 auto;
  padding:2px 8px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.18em;
  color:var(--gold);
  border:1px solid var(--gold-line);
  white-space:nowrap;
}
.scroll-strip__list{display:flex;align-items:center;min-height:var(--strip-h)}
.scroll-strip__item{display:flex;align-items:center}
.scroll-strip__item + .scroll-strip__item::before{
  content:"";
  width:1px;height:12px;
  margin:0 14px;
  background:rgba(217,164,65,.42);
}
.scroll-strip__link{
  display:inline-flex;
  align-items:center;
  min-height:34px;
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:.14em;
  color:var(--stone);
  text-decoration:none;
  white-space:nowrap;
  transition:color 200ms var(--ease);
}
.scroll-strip__link:hover{color:var(--gold-hi)}

/* 阅读进度 */
.read-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:rgba(217,164,65,.14);
  pointer-events:none;
}
.read-progress__bar{
  display:block;
  width:0;
  height:100%;
  background-image:linear-gradient(90deg,var(--flag-blue),var(--gold),var(--cinnabar));
  transition:width 120ms linear;
}

/* 6 · 按钮 --------------------------------------------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:10px 22px;
  font-family:var(--font-body);
  font-size:.9375rem;
  font-weight:700;
  letter-spacing:.06em;
  text-align:center;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:0;
  cursor:pointer;
  transition:background-color 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),box-shadow 200ms var(--ease);
}
.btn--primary{
  color:var(--paper);
  background-image:linear-gradient(180deg,#C0352B,#9C2A20);
  border-color:var(--gold-line-strong);
  box-shadow:inset 0 1px 0 rgba(246,223,166,.3);
}
.btn--primary:hover{background-image:linear-gradient(180deg,#D2453A,#AD3227);color:#fff}
.btn--ghost{
  color:var(--gold-hi);
  background:transparent;
  border-color:var(--gold-line-strong);
}
.btn--ghost:hover{background:rgba(217,164,65,.14);color:var(--butter)}
.btn--quiet{
  color:var(--stone);
  background:transparent;
  border-color:var(--stone-line);
}
.btn--quiet:hover{color:var(--paper);border-color:var(--gold-line-strong)}

/* 7 · 面包屑与索引条 ----------------------------------------------------- */
.breadcrumbs{
  padding:14px 0;
  border-bottom:1px solid var(--stone-line);
  font-size:var(--fs-small);
  color:var(--stone);
}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs__item{display:flex;align-items:center;gap:8px}
.breadcrumbs__item + .breadcrumbs__item::before{content:"›";color:var(--gold);line-height:1}
.breadcrumbs__link{color:var(--stone);text-decoration:none;transition:color 180ms var(--ease)}
.breadcrumbs__link:hover{color:var(--gold-hi)}
.breadcrumbs__current{color:var(--paper)}

.index-bar{
  display:flex;
  flex-wrap:wrap;
  border-top:1px solid var(--gold-line);
  border-bottom:1px solid var(--gold-line);
  background-color:rgba(23,41,63,.55);
}
.index-bar__item{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  padding:8px 16px;
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:.12em;
  color:var(--stone);
  text-decoration:none;
  border-right:1px solid var(--stone-line);
  transition:color 180ms var(--ease),background-color 180ms var(--ease);
}
.index-bar__item:last-child{border-right:0}
.index-bar__item:hover{color:var(--gold-hi);background:rgba(217,164,65,.08)}

/* 8 · 章节目录（滚动高亮） ----------------------------------------------- */
.toc{
  position:sticky;
  top:calc(var(--header-h) + 16px);
  font-size:var(--fs-small);
}
.toc__title{
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:.18em;
  color:var(--gold);
}
.toc__list{border-left:1px solid var(--stone-line)}
.toc__link{
  display:block;
  margin-left:-1px;
  padding:7px 12px;
  color:var(--stone);
  text-decoration:none;
  border-left:2px solid transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.toc__link:hover{color:var(--paper)}
.toc__link[aria-current="true"]{color:var(--gold-hi);border-left-color:var(--gold)}

/* 9 · 卡片 / 框景 / 标签 ------------------------------------------------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  color:var(--paper);
  background-color:var(--ink-2);
  background-image:linear-gradient(160deg,rgba(217,164,65,.06),rgba(14,26,43,0) 60%);
  box-shadow:inset 0 0 0 1px var(--stone-line);
  transition:box-shadow 200ms var(--ease),background-color 200ms var(--ease);
}
.card:hover{box-shadow:inset 0 0 0 2px var(--gold)}
.card__title{font-size:var(--fs-h3);margin-bottom:8px}
.card__meta{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:.1em;
  color:var(--gold);
}
.card__text{font-size:.9375rem;color:rgba(244,239,230,.8);line-height:1.75}
.card--paper{background-color:var(--paper);color:var(--ink-black);box-shadow:inset 0 0 0 1px var(--paper-line)}
.card--paper .card__title{color:var(--ink-black)}
.card--paper .card__text{color:rgba(20,16,12,.78)}

.frame{
  position:relative;
  padding:clamp(22px,3vw,42px);
  border:1px solid var(--gold-line-strong);
  background-color:rgba(23,41,63,.5);
}
.frame::before{
  content:"";
  position:absolute;
  inset:7px;
  border:1px dotted rgba(217,164,65,.5);
  pointer-events:none;
}
.frame--paper{background-color:var(--paper);color:var(--ink-black);border-color:rgba(20,16,12,.35)}
.frame--paper::before{border-color:rgba(20,16,12,.32)}
.frame--paper h1,.frame--paper h2,.frame--paper h3,.frame--paper h4{color:var(--ink-black)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  line-height:1.5;
  color:var(--gold-hi);
  background:rgba(217,164,65,.1);
  border:1px solid currentColor;
}
.tag--blue{color:#5ACFC4;background:rgba(42,167,155,.16)}
.tag--red{color:#F2917F;background:rgba(192,53,43,.2)}
.tag--green{color:var(--flag-green-hi);background:rgba(63,143,99,.2)}
.tag--paper{color:var(--ink-black);background:var(--butter);border-color:transparent}

.knot-rule{
  display:flex;
  align-items:center;
  gap:14px;
  margin:clamp(28px,4vw,48px) 0;
  color:var(--gold);
}
.knot-rule::before,.knot-rule::after{
  content:"";
  flex:1 1 auto;
  height:1px;
  background-image:linear-gradient(90deg,transparent,var(--gold-line-strong),transparent);
}
.knot-rule svg{width:22px;height:22px;flex:0 0 auto}

/* 10 · 正文块 ------------------------------------------------------------ */
.prose{max-width:68ch;font-size:1rem;line-height:1.85;color:rgba(244,239,230,.88)}
.prose > * + *{margin-top:1.1em}
.prose h2,.prose h3{margin-top:1.8em}
.prose a{
  color:var(--gold-hi);
  text-decoration:underline;
  text-decoration-color:var(--flag-blue);
  text-underline-offset:3px;
}
.prose ul li,.prose ol li{position:relative;padding-left:22px;margin-top:.55em}
.prose ul li::before{
  content:"";
  position:absolute;
  left:2px;top:.72em;
  width:8px;height:8px;
  background:var(--gold);
  transform:rotate(45deg);
}
.prose ol{counter-reset:prose-ol}
.prose ol li{counter-increment:prose-ol}
.prose ol li::before{
  content:counter(prose-ol);
  position:absolute;
  left:0;top:0;
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  color:var(--gold);
}
.prose--paper{color:rgba(20,16,12,.86)}
.prose--paper a{color:#8C2216;text-decoration-color:var(--flag-blue)}
.prose--paper ul li::before{background:var(--cinnabar)}

/* 11 · 图片容器基础规则 -------------------------------------------------- */
.img-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/9;
  overflow:hidden;
  border:1px solid var(--gold-line);
  background-color:var(--ink-3);
  background-image:
    linear-gradient(150deg,rgba(217,164,65,.22),rgba(14,26,43,.92) 65%),
    repeating-linear-gradient(45deg,rgba(140,154,170,.1) 0 1px,transparent 1px 10px);
}
.img-frame > img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.94) contrast(1.03);
}
.img-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:radial-gradient(rgba(244,239,230,.09) 1px,transparent 1px);
  background-size:3px 3px;
  mix-blend-mode:screen;
  opacity:.55;
}
.img-frame--wide{aspect-ratio:21/9}
.img-frame--square{aspect-ratio:1/1}
.img-frame--tall{aspect-ratio:3/4}
.img-frame__caption{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:.08em;
  color:var(--stone);
}

/* 12 · 折叠面板 ---------------------------------------------------------- */
.accordion{border-top:1px solid var(--gold-line)}
.accordion__item{border-bottom:1px solid var(--gold-line)}
.accordion__trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  min-height:52px;
  padding:14px 4px;
  font-size:1rem;
  font-weight:700;
  letter-spacing:.02em;
  text-align:left;
  color:var(--paper);
  cursor:pointer;
  transition:color 180ms var(--ease);
}
.accordion__trigger:hover{color:var(--gold-hi)}
.accordion__trigger::after{
  content:"+";
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:1.125rem;
  line-height:1;
  color:var(--gold);
  transition:transform 220ms var(--ease);
}
.accordion__trigger[aria-expanded="true"]::after{transform:rotate(45deg)}
.accordion__panel{display:grid;grid-template-rows:0fr;transition:grid-template-rows 220ms var(--ease)}
.accordion__trigger[aria-expanded="true"] + .accordion__panel{grid-template-rows:1fr}
.accordion__inner{overflow:hidden}
.accordion__inner > *{padding-bottom:16px;font-size:.9375rem;line-height:1.8;color:rgba(244,239,230,.84)}

/* 13 · 滚动显现 ---------------------------------------------------------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}
.delay-1{transition-delay:80ms}
.delay-2{transition-delay:160ms}
.delay-3{transition-delay:240ms}
.delay-4{transition-delay:320ms}

/* 14 · 页脚 -------------------------------------------------------------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  color:var(--paper);
  background-color:var(--ink-2);
  background-image:
    linear-gradient(rgba(140,154,170,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,154,170,.07) 1px,transparent 1px);
  background-size:32px 32px;
  border-top:1px solid var(--gold-line);
}
.site-footer__inner{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.55fr) minmax(0,1.2fr);
  gap:clamp(24px,4vw,56px);
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(40px,6vw,72px) var(--gutter) clamp(32px,4vw,48px);
}
.footer-brand{display:flex;flex-direction:column;gap:14px}
.footer-brand .brand{margin-bottom:2px}
.footer-brand__line{
  max-width:34ch;
  font-size:var(--fs-small);
  line-height:1.7;
  color:var(--stone);
}
.footer-brand__line--mono{
  font-family:var(--font-mono);
  letter-spacing:.06em;
  color:var(--gold);
  word-break:break-all;
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
}
.footer-nav__group{min-width:0}
.footer-nav__title{
  margin:0 0 12px;
  padding-bottom:8px;
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  font-weight:400;
  letter-spacing:.18em;
  color:var(--gold);
  border-bottom:1px solid var(--gold-line);
}
.footer-nav__list{display:grid;gap:2px}
.footer-nav__link{
  display:inline-flex;
  align-items:center;
  min-height:36px;
  font-size:var(--fs-small);
  color:rgba(244,239,230,.82);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.footer-nav__link:hover{color:var(--gold-hi);border-bottom-color:var(--gold-line-strong)}

.footer-contact{display:flex;flex-direction:column;gap:12px;min-width:0}
.footer-contact__list{display:grid;gap:10px}
.footer-contact__row{
  display:grid;
  grid-template-columns:44px minmax(0,1fr);
  gap:10px;
  align-items:start;
}
.footer-contact__key{
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:.12em;
  color:var(--stone);
  padding-top:3px;
}
.footer-contact__val{
  font-size:var(--fs-small);
  line-height:1.65;
  color:rgba(244,239,230,.86);
  word-break:break-word;
}
.footer-contact__note{
  padding:10px 12px;
  font-size:var(--fs-micro);
  line-height:1.7;
  color:var(--ink-black);
  background:var(--butter);
  border-left:3px solid var(--cinnabar);
}
.footer-contact__cta{align-self:flex-start;margin-top:2px}

.copy-btn{
  display:inline-flex;
  align-items:center;
  min-height:32px;
  padding:2px 0;
  max-width:100%;
  font-family:var(--font-mono);
  font-size:.8125rem;
  letter-spacing:.03em;
  line-height:1.5;
  text-align:left;
  color:var(--gold-hi);
  word-break:break-all;
  border-bottom:1px dashed rgba(243,200,104,.55);
  cursor:pointer;
  transition:color 160ms var(--ease),border-color 160ms var(--ease);
}
.copy-btn:hover,.copy-btn:focus-visible{color:var(--butter);border-bottom-color:var(--butter)}
.copy-btn[data-copied="true"]{color:var(--flag-green-hi);border-bottom-color:var(--flag-green-hi)}
.copy-btn--legal{font-size:var(--fs-small);color:var(--stone)}
.copy-btn--legal:hover,.copy-btn--legal:focus-visible{color:var(--gold-hi)}
.copy-btn--legal[data-copied="true"]{color:var(--flag-green-hi)}

.site-footer__base{
  border-top:1px solid var(--gold-line);
  background-color:rgba(14,26,43,.78);
}
.site-footer__base-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:16px var(--gutter);
  font-size:var(--fs-small);
  color:var(--stone);
}
.legal{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.legal__item{display:inline-flex}
.legal__sep{color:rgba(217,164,65,.55)}
.legal__link{
  color:var(--stone);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.legal__link:hover{color:var(--gold-hi);border-bottom-color:var(--gold-line-strong)}
.legal__copy{
  font-family:var(--font-mono);
  font-size:var(--fs-micro);
  letter-spacing:.08em;
  color:var(--stone);
}

/* 15 · 响应式 ------------------------------------------------------------ */
@media (max-width:1040px){
  .site-footer__inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .header-cta{display:none}
  .brand__tag{display:none}
  .site-nav{
    position:fixed;
    left:0;right:0;
    top:var(--header-h);
    display:block;
    margin:0;
    padding:10px var(--gutter) 26px;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    background-color:var(--ink-2);
    background-image:linear-gradient(180deg,rgba(14,26,43,.6),rgba(14,26,43,0));
    border-bottom:1px solid var(--gold-line);
    box-shadow:0 30px 50px -30px rgba(0,0,0,.95);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity 220ms var(--ease),transform 220ms var(--ease),visibility 220ms var(--ease);
  }
  .site-header[data-open="true"] .site-nav{
    opacity:1;
    visibility:visible;
    transform:none;
    pointer-events:auto;
  }
  .site-nav__list{display:block}
  .site-nav__item{border-bottom:1px solid rgba(140,154,170,.2)}
  .site-nav__link{
    display:flex;
    align-items:center;
    min-height:52px;
    padding:12px 4px;
    font-size:1rem;
    letter-spacing:.06em;
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{
    padding-left:14px;
    box-shadow:inset 3px 0 0 var(--gold);
    background:rgba(217,164,65,.06);
  }
  .site-nav__cta{display:inline-flex;width:100%;margin-top:18px}
}
@media (max-width:680px){
  .site-footer__inner{grid-template-columns:minmax(0,1fr)}
  .footer-nav{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:auto}
  .site-footer__base-inner{flex-direction:column;align-items:flex-start}
  .btn{width:100%}
  .footer-contact__cta{width:100%}
}

/* 16 · 动效降级 ---------------------------------------------------------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .site-nav{transform:none}
}