*,*::before,*::after{box-sizing:border-box}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
ul[class],ol[class]{padding:0;list-style:none}
img{max-width:100%;display:block;height:auto}
input,button,textarea,select{font:inherit}
address{font-style:normal}

:root{
  --font-sans:'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'Roboto Mono','SF Mono','Menlo',Consolas,monospace;
  --color-bg:#F5F5F0;
  --color-text:#1A1A1A;
  --color-text-secondary:#4D4D4D;
  --color-text-muted:#8C8C8C;
  --color-brand:#0A2A5E;
  --color-brand-light:#1E4E8F;
  --color-accent:#FF6B00;
  --color-live:#39FF14;
  --color-line:#E5E5E5;
  --color-block:#F0F0F0;
  --header-height:56px;
  --header-z:100;
  --container-width:1280px;
  --radius:2px;
  --space-sm:8px;
  --space-md:20px;
  --space-lg:40px;
}

@media (min-width:768px){
  :root{--header-height:64px}
}

html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--color-bg);
  color:var(--color-text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
main{display:block}
h1,h2,h3,h4{line-height:1.3;font-weight:900;color:var(--color-text)}
a{color:var(--color-brand);text-underline-offset:2px}
a:hover{color:var(--color-brand-light)}
::selection{background:var(--color-brand);color:#fff}

.container{
  max-width:var(--container-width);
  margin-inline:auto;
  padding-inline:var(--space-md);
}
.section{padding-block:64px}
.section--tight{padding-block:32px}
@media (min-width:768px){
  .section{padding-block:96px}
}

.grid{display:grid;gap:24px}
.grid--2,.grid--3{grid-template-columns:1fr}
.grid--gap-sm{gap:12px}
@media (min-width:768px){
  .grid--2{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(3,1fr)}
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 20px;
  font-weight:700;
  font-size:1rem;
  border-radius:var(--radius);
  border:2px solid transparent;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease,transform .18s ease;
}
.btn--primary{background:var(--color-brand);color:#fff}
.btn--primary:hover{background:var(--color-brand-light);color:#fff;transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--color-brand);border-color:var(--color-brand)}
.btn--ghost:hover{background:var(--color-brand);color:#fff}
.btn--accent{background:var(--color-accent);color:#fff}
.btn--accent:hover{background:#e85e00;color:#fff}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0 0 24px;
  padding:0;
  list-style:none;
  font-size:.875rem;
  color:var(--color-text-secondary);
}
.breadcrumb li{display:flex;align-items:center}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:var(--color-text-muted)}
.breadcrumb a{color:var(--color-brand);font-weight:600;text-decoration:none}
.breadcrumb [aria-current="page"]{color:var(--color-text-muted);font-weight:400}

.prose{max-width:72ch}
.prose h1{font-size:2rem;margin-bottom:1rem}
.prose h2{font-size:1.5rem;margin:2rem 0 .75rem}
.prose h3{font-size:1.25rem;margin:1.5rem 0 .5rem}
.prose p{margin:0 0 1rem}
.prose ul{margin:0 0 1rem;padding-left:1.2em}
.prose li{margin:.4em 0}
.prose blockquote{border-left:4px solid var(--color-brand);padding-left:1.2rem;color:var(--color-text-secondary)}

.media-frame{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  background:var(--color-block);
  border-radius:var(--radius);
  overflow:hidden;
  aspect-ratio:16/10;
  color:var(--color-text-muted);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.18em;
  text-transform:uppercase;
}
.media-frame::after{content:attr(data-label)}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--free{aspect-ratio:auto;min-height:220px}

.live-indicator{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:.75rem;
  font-weight:700;
  letter-spacing:.15em;
  color:var(--color-brand);
  text-transform:uppercase;
}
.live-indicator::before{
  content:"";
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--color-live);
  box-shadow:0 0 0 3px rgba(57,255,20,.25);
}

.metric{font-family:var(--font-mono);font-size:1.25rem;font-weight:700;color:var(--color-brand)}
.metric--inline{background:var(--color-block);padding:2px 8px;border-radius:var(--radius)}

.skip-link{
  position:fixed;
  top:8px;
  left:-9999px;
  z-index:200;
  background:var(--color-accent);
  color:#fff;
  padding:10px 16px;
  border-radius:var(--radius);
  font-weight:700;
  text-decoration:none;
}
.skip-link:focus{left:8px}

.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:var(--header-z);
  background-color:rgba(10,42,94,.72);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  color:#fff;
  border-bottom:1px solid transparent;
  transition:background-color .25s ease,color .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.site-header[data-scrolled="true"]{
  background-color:rgba(245,245,240,.96);
  -webkit-backdrop-filter:none;
  backdrop-filter:none;
  color:var(--color-text);
  border-bottom-color:var(--color-line);
  box-shadow:0 2px 8px rgba(0,0,0,.04);
}
.site-header[data-nav-open]{
  background-color:var(--color-brand);
  color:#fff;
  border-bottom-color:rgba(255,255,255,.2);
}
.site-header__inner{
  max-width:var(--container-width);
  margin-inline:auto;
  height:var(--header-height);
  padding-inline:var(--space-md);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}

.site-brand{
  display:inline-flex;
  flex-direction:column;
  line-height:1.15;
  text-decoration:none;
  color:inherit;
  flex-shrink:0;
}
.site-brand:hover{color:inherit}
.site-brand__zh{font-size:1.25rem;font-weight:900;letter-spacing:.03em}
.site-brand__en{font-size:.7rem;font-weight:500;letter-spacing:.18em;text-transform:uppercase;opacity:.75}
.site-brand--footer{color:#fff}
.site-brand--footer:hover{color:var(--color-accent)}

.site-nav__list{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}
.site-nav__item{margin:0}
.site-nav__link{
  display:block;
  padding:8px 12px;
  font-size:.95rem;
  font-weight:700;
  color:inherit;
  text-decoration:none;
  border-radius:var(--radius);
  position:relative;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:3px;
  height:2px;
  background:var(--color-accent);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .18s ease;
}
.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--color-accent)}
.site-header[data-scrolled="true"] .site-nav__link[aria-current="page"]{color:var(--color-brand-light)}
.site-header[data-nav-open] .site-nav__link[aria-current="page"]{color:var(--color-accent)}

.site-nav-toggle{
  display:none;
  width:44px;
  height:44px;
  align-items:center;
  justify-content:center;
  gap:6px;
  background:none;
  border:0;
  color:inherit;
  padding:0;
  cursor:pointer;
}
.site-nav-toggle:hover{color:var(--color-accent)}
.site-nav-toggle__label{font-size:.875rem;font-weight:700;line-height:1}
.site-nav-toggle__bars{
  width:18px;
  height:2px;
  background:currentColor;
  position:relative;
  transition:background .2s ease;
}
.site-nav-toggle__bars::before,
.site-nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:2px;
  background:currentColor;
  transition:transform .2s ease,top .2s ease,bottom .2s ease;
}
.site-nav-toggle__bars::before{top:-6px}
.site-nav-toggle__bars::after{bottom:-6px}
.site-header[data-nav-open] .site-nav-toggle__bars{background:transparent}
.site-header[data-nav-open] .site-nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.site-header[data-nav-open] .site-nav-toggle__bars::after{bottom:0;transform:rotate(-45deg)}

.site-header__progress{
  position:absolute;
  left:0;
  bottom:-1px;
  height:2px;
  width:0%;
  background:var(--color-accent);
  z-index:2;
}

@media (max-width:899px){
  .site-nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;
    top:var(--header-height);
    left:0;
    right:0;
    background:var(--color-brand);
    border-bottom:2px solid var(--color-accent);
    padding:0 var(--space-md) 16px;
    visibility:hidden;
    opacity:0;
    transform:translateY(-10px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s;
  }
  .site-nav[data-open]{
    visibility:visible;
    opacity:1;
    transform:translateY(0);
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .site-nav__link{
    padding:14px 4px;
    border-bottom:1px solid rgba(255,255,255,.14);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{
    background:rgba(255,255,255,.06);
    border-left:3px solid var(--color-accent);
    padding-left:10px;
  }
  .site-nav__link:hover{
    background:rgba(255,255,255,.06);
  }
}

.site-footer{
  background:var(--color-brand);
  color:#fff;
  margin-top:64px;
}
.site-footer a{color:inherit}
.site-footer__inner{
  max-width:var(--container-width);
  margin-inline:auto;
  padding:48px var(--space-md) 24px;
}
.site-footer__grid{
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
}
.site-footer__brand{min-width:0}
.site-footer__tagline{
  max-width:34em;
  margin:12px 0 0;
  color:rgba(255,255,255,.75);
  font-size:.9rem;
}
.site-footer__nav{min-width:0}
.site-footer__list{
  margin:0;
  padding:0;
  list-style:none;
}
.site-footer__link{
  display:block;
  padding:6px 0;
  border-bottom:1px solid rgba(255,255,255,.12);
  color:rgba(255,255,255,.85);
  text-decoration:none;
  transition:color .15s ease,padding-left .15s ease;
}
.site-footer__link:hover{
  color:var(--color-accent);
  padding-left:8px;
}
.site-footer__meta{
  color:rgba(255,255,255,.7);
  font-size:.875rem;
}
.site-footer__meta p{margin:6px 0}
.site-footer__bottom{
  max-width:var(--container-width);
  margin:32px auto 0;
  padding-top:20px;
  border-top:1px solid rgba(255,255,255,.2);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:8px;
  font-size:.75rem;
  color:rgba(255,255,255,.55);
}
.site-footer__bottom p{margin:0}

@media (min-width:768px){
  .site-footer__grid{grid-template-columns:1fr 1fr}
  .site-footer__brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  .site-footer__grid{grid-template-columns:1.4fr .8fr 1.2fr}
  .site-footer__brand{grid-column:auto}
}

:focus-visible{
  outline:3px solid var(--color-accent);
  outline-offset:2px;
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    transition-duration:.01ms !important;
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
  }
}