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

:root{
  --ink-900:#061A13;
  --ink-800:#0B241C;
  --ink-700:#12352A;
  --mint:#3DF5B0;
  --mint-soft:#A8FFDC;
  --amber:#FFB454;
  --amber-deep:#C77A1E;
  --fog:#EAF7F0;
  --sage:#9FB8AC;
  --line:#2E5445;
  --danger:#FF6B6B;
  --on-bright:#04110C;

  --wrap:1240px;
  --gutter:clamp(1rem,2vw,1.75rem);
  --radius-s:10px;
  --radius-m:18px;
  --radius-l:28px;
  --ease:cubic-bezier(.4,.15,.2,1);

  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-serif:"Noto Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  margin:0;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 620px at 88% -8%,rgba(61,245,176,.10),transparent 62%),
    radial-gradient(760px 520px at -12% 24%,rgba(255,180,84,.07),transparent 68%);
  color:var(--fog);
  font-family:var(--font-body);
  font-size:clamp(1rem,.96rem + .18vw,1.075rem);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  min-height:100vh;
}

img,svg,video{display:block;max-width:100%}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 1em}
a{color:var(--mint);text-decoration:none;transition:color .16s var(--ease),border-color .16s var(--ease)}
a:hover{color:var(--mint-soft)}
button{font:inherit;color:inherit}
strong{font-weight:700}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.04;
  letter-spacing:-.01em;
  color:var(--fog);
  text-wrap:balance;
}
h1{font-size:clamp(2.5rem,6vw,5.25rem)}
h2{font-size:clamp(1.75rem,3.4vw,3rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.5rem);letter-spacing:.01em;line-height:1.2}
h4{font-size:1.05rem;letter-spacing:.02em}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}

:focus-visible{
  outline:2px solid var(--mint);
  outline-offset:3px;
  border-radius:2px;
}

.skip-link{
  position:fixed;
  top:-100%;
  left:1rem;
  z-index:400;
  padding:.7rem 1.1rem;
  background:var(--mint);
  color:var(--on-bright);
  font-weight:700;
  font-size:.9rem;
  border-radius:0 0 var(--radius-s) var(--radius-s);
  transition:top .16s var(--ease);
}
.skip-link:focus{top:0;color:var(--on-bright)}

.wrap{
  width:min(100% - 2.5rem,var(--wrap));
  margin-inline:auto;
}

/* ============ HEADER ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(6,26,19,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
}

.header-ticker{
  overflow:hidden;
  max-height:38px;
  background:var(--ink-900);
  border-bottom:1px solid rgba(46,84,69,.6);
  transition:max-height .2s var(--ease),opacity .2s var(--ease);
}
.ticker{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.35rem 1.5rem;
  padding-block:.3rem;
  font-size:.7rem;
  letter-spacing:.16em;
  color:var(--sage);
  text-transform:uppercase;
}
.ticker-item{
  margin:0;
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  font-size:.7rem;
  letter-spacing:.12em;
}
.ticker-meta{color:rgba(159,184,172,.72)}
.ticker-meta .mono{color:var(--mint);letter-spacing:.08em;font-size:.72rem;text-transform:none}
.ticker-dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--mint);
  box-shadow:0 0 0 3px rgba(61,245,176,.16);
  flex:none;
}
.site-header[data-scrolled="true"] .header-ticker{max-height:0;opacity:0;border-bottom-color:transparent}

.command-bar{position:relative}

.command-inner{
  display:flex;
  align-items:center;
  gap:clamp(.5rem,1.5vw,1.25rem);
  padding-block:.7rem;
  transition:padding-block .18s var(--ease);
}
.site-header[data-scrolled="true"] .command-inner{padding-block:.42rem}

.brand-lockup{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  color:var(--fog);
  flex:none;
}
.brand-lockup:hover{color:var(--mint)}
.brand-mark{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:3px;
  width:1.55rem;
  flex:none;
}
.brand-mark-line{
  display:block;
  height:2px;
  background:var(--mint);
  border-radius:2px;
}
.brand-mark-line:nth-child(1){width:100%}
.brand-mark-line:nth-child(2){width:66%;background:var(--amber)}
.brand-mark-line:nth-child(3){width:88%}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-cn{
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.02rem;
  letter-spacing:.04em;
}
.brand-en{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.22em;
  color:var(--sage);
}
.brand-lockup:hover .brand-en{color:var(--mint)}

.current-channel{
  display:flex;
  flex-direction:column;
  gap:.1rem;
  margin:0;
  padding-left:.75rem;
  border-left:1px solid var(--line);
  flex:none;
}
.channel-key{
  font-family:var(--font-serif);
  font-size:.6rem;
  letter-spacing:.2em;
  color:var(--sage);
}
.channel-val{
  font-family:var(--font-display);
  font-weight:700;
  font-size:.86rem;
  letter-spacing:.04em;
  color:var(--mint);
}

.primary-nav{margin-left:auto}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-item{flex:none}
.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:.4rem;
  padding:.5rem .62rem;
  border:1px solid transparent;
  border-radius:6px;
  font-family:var(--font-display);
  font-weight:700;
  font-size:.95rem;
  letter-spacing:.03em;
  color:var(--sage);
  transition:color .16s var(--ease),background-color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.nav-link:hover{
  color:var(--mint);
  background:var(--ink-700);
  border-color:var(--line);
  transform:translateY(-2px);
}
.nav-index{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.06em;
  color:var(--line);
  transition:color .16s var(--ease);
}
.nav-link:hover .nav-index{color:var(--mint)}
.nav-link[aria-current="page"]{
  color:var(--on-bright);
  background:var(--mint);
  border-color:var(--mint);
}
.nav-link[aria-current="page"] .nav-index{color:rgba(4,17,12,.55)}

.command-tools{
  display:flex;
  align-items:center;
  gap:.45rem;
  flex:none;
}

.version-chip{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  padding:.32rem .6rem .32rem .32rem;
  background:rgba(255,180,84,.1);
  border:1px solid rgba(255,180,84,.45);
  border-radius:999px;
  color:var(--amber);
  cursor:pointer;
  transition:transform .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.version-chip:hover{
  transform:translateY(-2px);
  border-color:var(--amber);
  background:rgba(255,180,84,.18);
}
.version-tag{
  background:var(--amber);
  color:var(--on-bright);
  font-family:var(--font-mono);
  font-weight:700;
  font-size:.68rem;
  letter-spacing:.06em;
  padding:.12rem .42rem;
  border-radius:999px;
}
.version-label{
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--amber);
  white-space:nowrap;
}

.index-toggle{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.36rem .6rem;
  background:transparent;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--sage);
  cursor:pointer;
  font-size:.74rem;
  letter-spacing:.1em;
  transition:color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.index-toggle:hover{color:var(--mint);border-color:var(--mint);transform:translateY(-2px)}
.index-glyph{display:inline-flex;flex-direction:column;gap:2px}
.index-glyph i{display:block;width:12px;height:2px;background:currentColor;border-radius:1px}
.index-text{white-space:nowrap}

.nav-toggle{
  display:none;
  position:relative;
  width:2.4rem;
  height:2.4rem;
  background:var(--ink-700);
  border:1px solid var(--line);
  border-radius:var(--radius-s);
  color:var(--fog);
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--mint);color:var(--mint)}
.nav-toggle-bar{
  position:absolute;
  left:50%;
  top:50%;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .18s var(--ease);
}
.nav-toggle-bar:nth-child(1){transform:translate(-50%,calc(-50% - 4px))}
.nav-toggle-bar:nth-child(2){transform:translate(-50%,calc(-50% + 4px))}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translate(-50%,-50%) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){transform:translate(-50%,-50%) rotate(-45deg)}

/* popovers */
.popover{
  position:absolute;
  top:100%;
  right:max(1rem,calc((100vw - var(--wrap)) / 2));
  z-index:130;
  width:min(23rem,calc(100vw - 2rem));
  padding:1.1rem 1.2rem 1.15rem;
  background:var(--ink-700);
  border:1px solid var(--line);
  border-top:2px solid var(--mint);
  border-radius:0 0 var(--radius-m) var(--radius-m);
  box-shadow:0 24px 60px rgba(0,0,0,.55);
  animation:pop-in .16s var(--ease);
}
@keyframes pop-in{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

.popover-head{
  position:relative;
  padding-right:2rem;
  margin-bottom:.9rem;
  padding-bottom:.7rem;
  border-bottom:1px solid var(--line);
}
.popover-kicker{
  margin:0 0 .2rem;
  font-family:var(--font-serif);
  font-size:.66rem;
  letter-spacing:.24em;
  color:var(--mint);
}
.popover-title{
  font-size:1.3rem;
  letter-spacing:.01em;
}
.popover-close{
  position:absolute;
  top:-.2rem;
  right:-.3rem;
  width:1.9rem;
  height:1.9rem;
  display:grid;
  place-items:center;
  background:transparent;
  border:1px solid var(--line);
  border-radius:50%;
  color:var(--sage);
  font-size:1rem;
  line-height:1;
  cursor:pointer;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.popover-close:hover{color:var(--mint);border-color:var(--mint)}

.step-list{display:flex;flex-direction:column;gap:.65rem}
.step-item{
  display:grid;
  grid-template-columns:2rem 1fr;
  gap:.55rem;
  align-items:start;
  font-size:.86rem;
  line-height:1.6;
  color:var(--sage);
}
.step-num{
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:600;
  color:var(--amber);
  letter-spacing:.06em;
  padding-top:.15rem;
}
.step-text{color:var(--fog)}
.step-code{color:var(--amber);font-weight:600}

.popover-foot{
  margin-top:1rem;
  padding-top:.8rem;
  border-top:1px dashed var(--line);
}
.popover-link{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  font-family:var(--font-display);
  font-weight:700;
  font-size:.86rem;
  letter-spacing:.06em;
  color:var(--mint);
  border-bottom:1px solid rgba(61,245,176,.4);
}
.popover-link:hover{color:var(--mint-soft);border-color:var(--mint-soft)}

.index-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:.35rem;
}
.index-link{
  display:flex;
  align-items:baseline;
  gap:.5rem;
  padding:.45rem .5rem;
  border-radius:6px;
  border:1px solid transparent;
  color:var(--fog);
  font-size:.86rem;
  transition:background-color .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease);
}
.index-link:hover{background:var(--ink-800);border-color:var(--line);color:var(--mint)}
.index-num{
  font-family:var(--font-mono);
  font-size:.66rem;
  color:var(--line);
}
.index-link:hover .index-num{color:var(--amber)}
.index-name{letter-spacing:.02em}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:rgba(61,245,176,.1);
  overflow:hidden;
}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:100%;
  background:linear-gradient(90deg,var(--mint),var(--amber));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .1s linear;
}

/* ============ FOOTER ============ */
.site-footer{
  position:relative;
  margin-top:clamp(3.5rem,7vw,6.5rem);
  background:var(--ink-800);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--mint),transparent);
  opacity:.55;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.9fr);
  gap:clamp(1.75rem,4vw,3.5rem);
  padding-block:clamp(2.25rem,5vw,3.5rem) clamp(1.5rem,3vw,2.25rem);
}
.footer-brand{max-width:24rem}
.footer-lockup{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.5rem;
  letter-spacing:.02em;
  color:var(--fog);
}
.footer-lockup-en{
  margin:.15rem 0 .85rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.28em;
  color:var(--mint);
}
.footer-blurb{
  margin:0 0 .9rem;
  font-size:.86rem;
  line-height:1.7;
  color:var(--sage);
}
.footer-coords{
  margin:0;
  display:inline-block;
  padding:.2rem .55rem;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:.68rem;
  color:var(--amber);
}

.footer-nav-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(1rem,2.5vw,2rem);
}
.footer-col{min-width:0}
.footer-heading{
  margin:0 0 .85rem;
  font-family:var(--font-serif);
  font-weight:500;
  font-size:.72rem;
  letter-spacing:.22em;
  color:var(--sage);
  padding-bottom:.5rem;
  border-bottom:1px solid var(--line);
}
.footer-list{display:flex;flex-direction:column;gap:.1rem}
.footer-link{
  display:inline-block;
  padding:.24rem 0;
  color:var(--fog);
  font-size:.9rem;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.footer-link:hover{
  color:var(--mint);
  border-color:rgba(61,245,176,.5);
  transform:translateX(3px);
}

.footer-contact{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem clamp(1rem,3vw,2.5rem);
  padding-block:clamp(1rem,2vw,1.4rem);
  border-top:1px solid var(--line);
}
.contact-line{
  margin:0;
  display:inline-flex;
  align-items:baseline;
  gap:.5rem;
  font-size:.84rem;
  color:var(--fog);
}
.contact-key{
  font-family:var(--font-serif);
  font-size:.68rem;
  letter-spacing:.18em;
  color:var(--sage);
}
.contact-line .mono{color:var(--mint-soft);font-size:.86rem}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem 1.5rem;
  padding-block:1rem 2.25rem;
  border-top:1px solid var(--line);
  font-size:.76rem;
  color:var(--sage);
}
.footer-bottom p{margin:0}
.footer-note{letter-spacing:.02em}
.footer-icp{color:var(--sage)}
.footer-copy{margin-left:auto;color:rgba(159,184,172,.8)}

/* ============ SHARED COMPONENTS ============ */
.page-body{padding-block:clamp(2rem,4vw,3.25rem)}
.content-narrow{max-width:68ch}
.divider{height:1px;border:0;margin:clamp(1.5rem,3vw,2.5rem) 0;background:linear-gradient(90deg,var(--line),transparent)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.72rem 1.25rem;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-display);
  font-weight:800;
  font-size:.94rem;
  letter-spacing:.06em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--mint);color:var(--on-bright)}
.btn--primary:hover{background:var(--mint-soft);color:var(--on-bright);box-shadow:0 14px 30px rgba(61,245,176,.22)}
.btn--amber{background:var(--amber);color:var(--on-bright)}
.btn--amber:hover{background:var(--amber-deep);color:var(--on-bright);box-shadow:0 14px 30px rgba(255,180,84,.22)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--fog)}
.btn--ghost:hover{border-color:var(--mint);color:var(--mint);background:rgba(61,245,176,.07)}

.breadcrumb{margin-bottom:clamp(1rem,2vw,1.6rem);font-size:.78rem}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;color:var(--sage)}
.breadcrumb-list li+li::before{content:"/";margin-right:.4rem;color:var(--line)}
.breadcrumb-link{color:var(--sage);border-bottom:1px solid transparent}
.breadcrumb-link:hover{color:var(--mint);border-color:var(--mint)}
.breadcrumb-current{color:var(--fog)}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gutter);
}
.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}

.rail-layout{
  display:grid;
  grid-template-columns:minmax(0,3fr) minmax(0,9fr);
  gap:clamp(1.5rem,3vw,3rem);
  align-items:start;
}
.rail{min-width:0}
.rail-sticky{position:sticky;top:6.75rem}

.section-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:.35rem 1.1rem;
  align-items:end;
  padding-bottom:.9rem;
  margin-bottom:clamp(1.25rem,2.5vw,2rem);
  border-bottom:1px solid var(--line);
}
.section-index{
  font-family:var(--font-mono);
  font-weight:600;
  font-size:clamp(1.9rem,4vw,3.1rem);
  line-height:.85;
  color:var(--amber);
  letter-spacing:.01em;
}
.section-kicker{
  margin:0 0 .2rem;
  font-family:var(--font-serif);
  font-weight:500;
  font-size:.7rem;
  letter-spacing:.24em;
  color:var(--mint);
}
.section-title{
  margin:0;
  font-size:clamp(1.4rem,2.6vw,2.1rem);
  letter-spacing:.01em;
}

.card{
  position:relative;
  padding:clamp(1.05rem,2vw,1.6rem);
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:rgba(61,245,176,.55);box-shadow:0 18px 40px rgba(0,0,0,.35)}
.card--offset{transform:translateY(-.9rem)}
.card--offset:hover{transform:translateY(-1.05rem)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.16rem .55rem;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--ink-700);
  color:var(--sage);
  font-size:.7rem;
  letter-spacing:.1em;
  line-height:1.6;
}
.tag--amber{border-color:rgba(255,180,84,.5);background:rgba(255,180,84,.1);color:var(--amber)}

.stat-value{
  font-family:var(--font-mono);
  font-weight:600;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
  color:var(--amber);
  white-space:nowrap;
}

.media-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,15rem),1fr));
  gap:var(--gutter);
}
.media-frame{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  background:
    linear-gradient(155deg,var(--ink-700),var(--ink-900) 62%,#0d2b21);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(46,84,69,.35) 0 1px,transparent 1px 34px),
    repeating-linear-gradient(90deg,rgba(46,84,69,.35) 0 1px,transparent 1px 34px);
  opacity:.4;
  mix-blend-mode:screen;
}
.media-frame img{
  position:relative;
  z-index:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--banner{aspect-ratio:21/9}
.media-caption{
  margin:.55rem 0 0;
  font-family:var(--font-serif);
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--sage);
}

/* ============ RESPONSIVE ============ */
@media (max-width:1180px){
  .current-channel{display:none}
}

@media (max-width:960px){
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center}
  .index-text{display:none}
  .version-label{display:none}
  .primary-nav{
    display:none;
    position:absolute;
    top:100%;
    left:0;
    right:0;
    margin-left:0;
    padding:.7rem 1.25rem 1.1rem;
    background:var(--ink-800);
    border-bottom:1px solid var(--line);
    box-shadow:0 20px 40px rgba(0,0,0,.45);
    max-height:calc(100dvh - 7rem);
    overflow-y:auto;
  }
  .primary-nav[data-open="true"]{display:block;animation:pop-in .18s var(--ease)}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{
    width:100%;
    padding:.7rem .8rem;
    font-size:1rem;
    border-color:var(--line);
  }
  .nav-link:hover{transform:none}
  .nav-link[aria-current="page"]{border-color:var(--mint)}
  .popover{left:1rem;right:1rem;width:auto;border-radius:0 0 var(--radius-m) var(--radius-m)}
  .rail-layout{grid-template-columns:1fr}
  .rail-sticky{position:static}
  .footer-top{grid-template-columns:1fr}
}

@media (max-width:760px){
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9{grid-column:span 12}
  .footer-nav-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.25rem 1rem}
  .footer-copy{margin-left:0}
}

@media (max-width:640px){
  .ticker-meta{display:none}
  .ticker{justify-content:flex-start}
  .brand-en{display:none}
  .wrap{width:min(100% - 1.75rem,var(--wrap))}
  .version-chip{padding:.28rem .5rem .28rem .28rem}
  .index-grid{grid-template-columns:1fr}
  .footer-contact{flex-direction:column;gap:.35rem}
}

@media (max-width:380px){
  .brand-cn{font-size:.92rem}
  .command-tools{gap:.3rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .nav-link:hover,.index-toggle:hover,.version-chip:hover,.btn:hover,.card:hover,.card--offset:hover,.footer-link:hover{transform:none}
}