:root{
  --ink:#070D15;
  --ink-2:#0E1A2B;
  --teal:#0F2E31;
  --indigo:#241A3E;
  --wine:#33131F;
  --lime:#C8F751;
  --lime-deep:#8FBE2E;
  --orange:#FF8A3D;
  --paper:#EEF3F6;
  --muted:#93A7B8;
  --rule:#1E3048;
  --rule-soft:rgba(30,48,72,.62);
  --shell:1320px;
  --gutter:72px;
  --gap:24px;
  --shadow:8px 8px 0 rgba(0,0,0,.55);
  --shadow-sm:4px 4px 0 rgba(0,0,0,.5);
  --ease:cubic-bezier(.2,.7,.2,1);
  --dur:240ms;
  --dur-rail:320ms;
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
@media (max-width:1199px){ :root{ --gutter:40px; } }
@media (max-width:767px){ :root{ --gutter:20px; --gap:16px; } }

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

html{background:var(--ink)}
body{
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    linear-gradient(to right, rgba(30,48,72,.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30,48,72,.30) 1px, transparent 1px);
  background-size:96px 96px, 96px 96px;
  background-position:0 0, 0 0;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:1;
  background-image:radial-gradient(rgba(238,243,246,.05) 1px, transparent 1px);
  background-size:4px 4px;
  opacity:.5;
}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;letter-spacing:-.01em;line-height:1.08;color:var(--paper)}
p{max-width:68ch}
a{transition:color var(--dur) var(--ease)}

:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
::selection{background:var(--lime);color:var(--ink)}

.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}

.container{
  width:100%;
  max-width:calc(var(--shell) + var(--gutter) * 2);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

/* ============ 头部 ============ */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-100px;
  z-index:120;
  display:inline-block;
  padding:10px 16px;
  border:2px solid var(--lime);
  background:var(--ink-2);
  color:var(--lime);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:100;
  background:transparent;
  border-bottom:2px solid transparent;
  transition:background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), backdrop-filter var(--dur) var(--ease);
}
.site-header[data-scrolled="true"]{
  background:rgba(14,26,43,.95);
  border-bottom-color:var(--rule);
  backdrop-filter:blur(10px);
}
.site-header[data-open="true"]{
  background:rgba(14,26,43,.98);
  border-bottom-color:var(--lime);
}

.header-inner{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(16px,2vw,32px);
  min-height:78px;
}

.brand-lockup{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  flex:0 0 auto;
  border:2px solid var(--lime);
  background:linear-gradient(150deg,#0F2E31,#070D15);
  color:var(--lime);
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  box-shadow:var(--shadow-sm);
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{font-family:var(--font-display);font-weight:800;font-size:20px;line-height:1.1;letter-spacing:.01em;color:var(--paper);white-space:nowrap}
.brand-name:hover{color:var(--lime)}
.brand-sub{font-size:12px;line-height:1.4;color:var(--muted);white-space:nowrap}
.version-badge{
  flex:0 0 auto;
  padding:3px 7px;
  border:1px solid var(--rule);
  background:rgba(200,247,81,.10);
  color:var(--lime);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:2px solid var(--rule);
  background:rgba(14,26,43,.9);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
}
.nav-toggle:hover{border-color:var(--lime)}
.site-header[data-open="true"] .nav-toggle{border-color:var(--lime);color:var(--lime)}
.nav-toggle-bars{
  width:20px;
  height:14px;
  background:
    linear-gradient(var(--lime),var(--lime)) 0 0/100% 2px no-repeat,
    linear-gradient(var(--paper),var(--paper)) 0 6px/100% 2px no-repeat,
    linear-gradient(var(--paper),var(--paper)) 0 12px/100% 2px no-repeat;
}
.nav-toggle-label{line-height:1}

.header-nav{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:clamp(12px,1.8vw,28px);
  min-width:0;
}
.nav-list{display:flex;align-items:center;gap:clamp(8px,1.4vw,22px)}
.nav-item{list-style:none}
.nav-link{
  position:relative;
  display:inline-block;
  padding:9px 2px 11px;
  font-size:14px;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--muted);
  white-space:nowrap;
  transition:color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:100%;
  bottom:2px;
  height:2px;
  background:var(--lime);
  transition:right var(--dur) var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--paper)}
.nav-link:hover::after,.nav-link:focus-visible::after{right:0}
.nav-link[aria-current="page"]{color:var(--paper);font-weight:700}
.nav-link[aria-current="page"]::after{right:0}

.header-actions{display:flex;align-items:center;gap:8px}
.action-chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 12px;
  border:2px solid var(--rule);
  background:rgba(7,13,21,.66);
  color:var(--paper);
  font-size:13px;
  font-weight:500;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.action-chip:hover,.action-chip:focus-visible{
  border-color:var(--lime);
  box-shadow:var(--shadow-sm);
  transform:translate(-2px,-2px);
}
.action-chip--primary{border-color:var(--lime);color:var(--lime)}
.action-chip--primary:hover,.action-chip--primary:focus-visible{background:var(--lime);color:var(--ink);border-color:var(--lime-deep)}

.nav-note{
  display:none;
  margin-top:14px;
  padding-top:12px;
  border-top:1px dashed var(--rule);
  font-size:13px;
  color:var(--muted);
  max-width:none;
}
.device-hint{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.02em;
  color:var(--muted);
  white-space:nowrap;
  max-width:none;
}

.header-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:-2px;
  height:2px;
  background:transparent;
  overflow:hidden;
}
.header-meter-fill{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--lime-deep),var(--lime));
  transition:transform 120ms linear;
}
@media (max-width:1319px){
  .action-chip--soft:nth-of-type(3){display:none}
}
@media (max-width:1199px){
  .device-hint{display:none}
  .action-chip--soft{display:none}
}
@media (max-width:1023px){
  .header-inner{
    grid-template-columns:1fr auto;
    align-items:center;
    min-height:64px;
    padding-block:12px;
    gap:12px;
  }
  .nav-toggle{display:inline-flex}
  .header-nav{
    grid-column:1 / -1;
    display:none;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    margin-top:12px;
    padding:16px;
    border:2px solid var(--rule);
    background:rgba(7,13,21,.96);
    box-shadow:var(--shadow);
    max-height:70vh;
    overflow-y:auto;
  }
  .site-header[data-open="true"] .header-nav{display:flex}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-item + .nav-item{border-top:1px solid var(--rule-soft)}
  .nav-link{
    display:block;
    padding:14px 4px;
    font-size:16px;
    color:var(--paper);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--lime);padding-left:14px;position:relative}
  .nav-link[aria-current="page"]::before{
    content:"";
    position:absolute;
    left:0;
    top:50%;
    width:6px;
    height:6px;
    margin-top:-3px;
    background:var(--lime);
  }
  .header-actions{
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    margin-top:16px;
  }
  .action-chip--soft{display:inline-flex}
  .action-chip{justify-content:center;padding:12px 14px;font-size:14px}
  .nav-note{display:block}
}

/* ============ 主内容壳 ============ */
.site-main{
  position:relative;
  z-index:2;
  padding-top:96px;
  display:block;
  min-height:60vh;
}
.site-main--flush{padding-top:0}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  z-index:2;
  margin-top:120px;
  background:var(--ink-2);
  border-top:2px solid var(--rule);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:6px;
  background:repeating-linear-gradient(90deg,var(--lime) 0 2px,transparent 2px 48px);
  opacity:.55;
}
.footer-shell{padding-block:64px 32px}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:40px 24px;
  align-items:start;
}
.footer-brand{display:grid;gap:10px;align-content:start}
.footer-logo{
  font-family:var(--font-display);
  font-weight:800;
  font-size:26px;
  line-height:1.1;
  letter-spacing:.01em;
  color:var(--paper);
  max-width:none;
}
.footer-domain{
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--lime);
  letter-spacing:.02em;
  max-width:none;
}
.footer-service{
  display:inline-block;
  justify-self:start;
  margin-top:4px;
  padding:4px 9px;
  border:1px solid var(--rule);
  font-size:12px;
  color:var(--muted);
  max-width:none;
}
.footer-col-title{
  margin-bottom:14px;
  padding-left:12px;
  position:relative;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
  max-width:none;
}
.footer-col-title::before{
  content:"";
  position:absolute;
  left:0;
  top:.55em;
  width:6px;
  height:6px;
  background:var(--lime);
}
.footer-links{display:grid;gap:2px}
.footer-link{
  display:inline-block;
  padding:6px 0;
  font-size:14px;
  color:var(--muted);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease), border-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--paper);border-bottom-color:var(--lime);padding-left:6px}
.footer-contact{
  margin-top:48px;
  padding-top:24px;
  border-top:1px solid var(--rule);
  display:grid;
  gap:8px;
}
.footer-contact-line{
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--paper);
  max-width:none;
}
.footer-address{font-size:13px;color:var(--muted);max-width:none}
.footer-note{font-size:13px;color:var(--muted);max-width:none}
.footer-meta{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:24px;
  padding-top:18px;
  border-top:1px solid var(--rule);
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--muted);
}
@media (max-width:1023px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px 24px}
  .footer-shell{padding-block:48px 28px}
}
@media (max-width:599px){
  .footer-grid{grid-template-columns:1fr}
  .site-footer{margin-top:80px}
}

/* ============ 分区与节奏 ============ */
.zone{
  position:relative;
  padding-block:96px;
  border-top:2px solid var(--rule);
}
.zone--flush{padding-block:0}
.zone--blue{background-color:var(--ink-2)}
.zone--teal{background-color:var(--teal)}
.zone--indigo{background-color:var(--indigo)}
.zone--wine{background-color:var(--wine)}
.zone--ink{background-color:var(--ink)}
.zone--grid::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(200,247,81,.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(200,247,81,.06) 1px, transparent 1px);
  background-size:24px 24px, 24px 24px;
}
.zone > *{position:relative;z-index:1}

.rule{
  position:relative;
  height:2px;
  margin-block:48px;
  background:var(--rule);
  border:0;
}
.rule::after{
  content:"";
  position:absolute;
  left:0;
  top:-3px;
  width:8px;
  height:8px;
  background:var(--lime);
}

/* ============ 标题体系 ============ */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--lime);
  max-width:none;
}
.eyebrow::before{
  content:"";
  width:28px;
  height:2px;
  background:var(--lime);
}
.index-num{
  display:inline-block;
  margin-right:12px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--muted);
  vertical-align:middle;
}
.display-xl{font-size:clamp(2.5rem,7vw,4.5rem);font-weight:800;line-height:1.02}
.display-l{font-size:clamp(2rem,4.4vw,2.75rem);font-weight:800}
.display-m{font-size:clamp(1.375rem,2.6vw,1.75rem);font-weight:700}
.lead{
  font-size:clamp(1rem,1.6vw,1.125rem);
  line-height:1.85;
  color:var(--paper);
  max-width:60ch;
}
.prose{max-width:68ch;color:var(--paper)}
.prose p + p{margin-top:1.1em}
.prose h2{margin-top:2em;margin-bottom:.6em;font-size:clamp(1.375rem,2.6vw,1.75rem)}
.prose h3{margin-top:1.6em;margin-bottom:.5em;font-size:20px}
.prose ul{margin:1em 0;display:grid;gap:.5em}
.prose li{position:relative;padding-left:20px}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:8px;
  height:2px;
  background:var(--lime);
}
.prose strong{font-weight:700;color:var(--lime)}

/* ============ 网格 ============ */
.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-12{grid-column:span 12}
@media (max-width:1023px){
  .span-3,.span-4,.span-5{grid-column:span 6}
  .span-6,.span-7,.span-8{grid-column:span 12}
}
@media (max-width:599px){
  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr))}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 4}
}

/* ============ 按钮与标签 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:2px solid var(--rule);
  background:transparent;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  transition:border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn:hover,.btn:focus-visible{transform:translate(-2px,-2px);box-shadow:var(--shadow-sm)}
.btn--primary{
  border-color:var(--lime);
  background:var(--lime);
  color:var(--ink);
  font-weight:700;
}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--lime-deep);border-color:var(--lime-deep);color:var(--ink)}
.btn--outline{border-color:var(--lime);color:var(--lime)}
.btn--outline:hover,.btn--outline:focus-visible{background:rgba(200,247,81,.12)}
.btn--quiet{border-color:var(--rule);color:var(--muted)}
.btn--quiet:hover,.btn--quiet:focus-visible{border-color:var(--paper);color:var(--paper)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--rule);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
  background:rgba(7,13,21,.5);
}
.tag--warm{border-color:var(--orange);color:var(--orange)}
.tag--lime{border-color:var(--lime);color:var(--lime);background:rgba(200,247,81,.10)}
.tag--muted{border-color:var(--rule);color:var(--muted)}

/* ============ 数据 ============ */
.stat{display:grid;gap:4px;align-content:start}
.stat-num{
  font-family:var(--font-mono);
  font-size:1.2em;
  font-weight:700;
  line-height:1;
  letter-spacing:-.01em;
  color:var(--lime);
  font-size:clamp(1.75rem,4vw,2.5rem);
}
.stat-label{
  font-size:13px;
  color:var(--muted);
  letter-spacing:.02em;
  max-width:none;
}

/* ============ 图片容器 ============ */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:2px solid var(--rule);
  background:linear-gradient(150deg,#0E1A2B 0%,#0F2E31 55%,#070D15 100%);
  box-shadow:var(--shadow);
  aspect-ratio:16/9;
  width:100%;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  filter:saturate(.9) contrast(1.05) brightness(.92);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(180deg, rgba(7,13,21,0) 45%, rgba(7,13,21,.72) 100%),
    linear-gradient(90deg, rgba(200,247,81,.10), rgba(7,13,21,0) 55%);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--hero{aspect-ratio:4/3}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-caption{
  margin-top:10px;
  font-size:13px;
  color:var(--muted);
  max-width:56ch;
}

/* ============ 横向条幅 ============ */
.rail{
  position:relative;
  overflow-x:auto;
  overflow-y:hidden;
  scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
  padding-bottom:12px;
  scrollbar-width:thin;
  scrollbar-color:var(--lime-deep) transparent;
}
.rail::-webkit-scrollbar{height:4px}
.rail::-webkit-scrollbar-track{background:var(--rule)}
.rail::-webkit-scrollbar-thumb{background:var(--lime-deep)}
.rail-track{
  display:flex;
  gap:var(--gap);
  align-items:stretch;
  min-width:min-content;
}
.rail-item{
  flex:0 0 auto;
  width:clamp(240px,32vw,360px);
  scroll-snap-align:start;
}
.rail-hint{
  display:flex;
  align-items:center;
  gap:10px;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
  max-width:none;
}
.rail-hint::before{
  content:"";
  width:48px;
  height:2px;
  background:repeating-linear-gradient(90deg,var(--lime) 0 6px,transparent 6px 12px);
}

/* ============ 锚点索引 ============ */
.index-rail{
  position:sticky;
  top:112px;
  display:grid;
  gap:2px;
  align-content:start;
  border-left:2px solid var(--rule);
  padding-left:2px;
}
.index-link{
  display:block;
  padding:9px 12px;
  border-left:2px solid transparent;
  margin-left:-4px;
  font-size:14px;
  color:var(--muted);
  transition:color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.index-link:hover,.index-link:focus-visible{color:var(--paper);background:rgba(30,48,72,.4)}
.index-link.is-active{
  color:var(--lime);
  border-left-color:var(--lime);
  background:rgba(200,247,81,.08);
}
@media (max-width:1023px){
  .index-rail{
    position:static;
    grid-auto-flow:column;
    grid-auto-columns:max-content;
    overflow-x:auto;
    border-left:0;
    border-bottom:2px solid var(--rule);
    padding:0 0 8px;
  }
}

/* ============ 面板 ============ */
.panel{
  border:2px solid var(--rule);
  background:rgba(7,13,21,.6);
  padding:24px;
  box-shadow:var(--shadow);
}
.panel--sticky{position:sticky;top:112px}
@media (max-width:1023px){
  .panel--sticky{position:static}
}

/* ============ 折叠组 ============ */
.expand-group{
  border:2px solid var(--rule);
  background:rgba(7,13,21,.45);
  transition:background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.expand-group + .expand-group{margin-top:12px}
.expand-group[data-open="true"]{
  border-color:var(--lime);
  background:rgba(200,247,81,.06);
}
.expand-trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:18px 20px;
  text-align:left;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:700;
  color:var(--paper);
  transition:color var(--dur) var(--ease);
}
.expand-trigger:hover,.expand-trigger:focus-visible{color:var(--lime)}
.expand-icon{
  flex:0 0 auto;
  width:22px;
  height:22px;
  position:relative;
  border:2px solid var(--lime);
  transition:transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.expand-icon::before,
.expand-icon::after{
  content:"";
  position:absolute;
  background:var(--lime);
  transition:opacity var(--dur) var(--ease);
}
.expand-icon::before{left:5px;right:5px;top:9px;height:2px}
.expand-icon::after{top:5px;bottom:5px;left:9px;width:2px}
.expand-group[data-open="true"] .expand-icon,
.expand-trigger[aria-expanded="true"] .expand-icon{transform:rotate(90deg);background:var(--lime)}
.expand-group[data-open="true"] .expand-icon::before,
.expand-group[data-open="true"] .expand-icon::after,
.expand-trigger[aria-expanded="true"] .expand-icon::before,
.expand-trigger[aria-expanded="true"] .expand-icon::after{background:var(--ink)}
.expand-panel{
  overflow:hidden;
  border-top:1px solid var(--rule);
}
.expand-body{padding:20px;max-width:68ch;color:var(--paper)}

/* ============ 面包屑 ============ */
.breadcrumb{margin-bottom:28px}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  color:var(--rule);
}
.breadcrumb-link{color:var(--muted)}
.breadcrumb-link:hover,.breadcrumb-link:focus-visible{color:var(--lime)}
.breadcrumb-item[aria-current="page"] .breadcrumb-link{color:var(--paper)}

/* ============ 显现动效 ============ */
.is-pending{
  opacity:0;
  transform:translateY(12px);
}
.is-pending.is-revealed{
  opacity:1;
  transform:none;
  transition:opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

@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;
  }
  .is-pending{opacity:1;transform:none}
  .btn:hover,.btn:focus-visible,.action-chip:hover,.action-chip:focus-visible{transform:none}
}