:root{
  --ink:#0B1220;
  --panel:#111C2F;
  --line:#1E2C44;
  --line-soft:#182438;
  --cream:#F4EDE1;
  --cream-deep:#DFD2BC;
  --cyan:#3DF0D2;
  --amber:#F2A93B;
  --ember:#E4572E;
  --brown:#241B13;
  --mist:#93A6C2;
  --white:#F7F7F5;
  --cyan-ink:#06231F;
  --font-display:"HarmonyOS Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --shell:1200px;
  --gutter:clamp(16px,4vw,40px);
  --r-s:8px;
  --r-m:14px;
  --r-l:22px;
  --shadow:0 20px 44px -28px rgba(0,0,0,.9);
  --ease:cubic-bezier(.22,.61,.36,1);
  color-scheme:dark;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}
body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--white);
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 78% at 88% -14%, rgba(61,240,210,.10), transparent 58%),
    radial-gradient(88% 66% at 0% 0%, rgba(242,169,59,.07), transparent 52%),
    linear-gradient(to right, rgba(30,44,68,.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30,44,68,.42) 1px, transparent 1px);
  background-size:auto,auto,72px 72px,72px 72px;
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  background-position:0 0,0 0,0 0,0 0;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}
.is-hidden{display:none !important}
#main-content{display:block}
#main-content:focus{outline:none}
::selection{background:var(--cyan);color:var(--cyan-ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:300;
  display:inline-block;
  padding:.7rem 1.15rem;
  border-radius:999px;
  background:var(--cyan);
  color:var(--cyan-ink);
  font:700 14px/1 var(--font-body);
  letter-spacing:.04em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

/* ---------- layout helpers ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  padding-block:clamp(44px,6.5vw,84px);
}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:clamp(20px,3vw,32px);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font:600 11.5px/1.2 var(--font-mono);
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
  margin-bottom:14px;
}
.eyebrow::before{
  content:"";
  width:20px;
  height:1px;
  background:currentColor;
  opacity:.75;
}
.display{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(2rem,5.6vw,4.6rem);
  line-height:.98;
  letter-spacing:-.03em;
  color:var(--white);
  margin:0;
}
.h2{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(1.5rem,3vw,2.4rem);
  line-height:1.16;
  letter-spacing:-.02em;
  margin:0 0 .5em;
}
.h3{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(1.05rem,1.9vw,1.35rem);
  line-height:1.3;
  letter-spacing:-.01em;
  margin:0 0 .55em;
}
.prose{
  max-width:68ch;
  color:var(--mist);
  font-size:16.5px;
  line-height:1.85;
}
.prose p{margin:0 0 1.1em}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--white);font-weight:700}
.prose a{color:var(--cyan);text-decoration-thickness:1px;text-underline-offset:3px}
.prose ul,.prose ol{list-style:disc;padding-left:1.25em;margin:0 0 1.1em}
.prose ol{list-style:decimal}

/* ---------- grid ---------- */
.grid{display:grid;gap:clamp(18px,2.6vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--compare{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--asym{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
@media (max-width:980px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:880px){
  .grid--2,.grid--3,.grid--compare,.grid--asym{grid-template-columns:minmax(0,1fr)}
}

/* ---------- panels ---------- */
.panel{
  position:relative;
  padding:clamp(20px,3vw,32px);
  border:1px solid var(--line);
  border-radius:var(--r-m);
  background:var(--panel);
  box-shadow:var(--shadow);
}
.panel--paper{
  background:var(--cream);
  color:var(--brown);
  border-color:#C9B89C;
  box-shadow:0 22px 46px -26px rgba(0,0,0,.85);
}
.panel--paper .eyebrow{color:#9A6A22}
.panel--paper .prose{color:#4A3B29}
.panel--paper .prose strong{color:var(--brown)}
.panel--paper .prose a{color:#96591A}
.panel--paper .tag{
  background:#E7DBC8;
  border-color:#C9B89C;
  color:#5B4A34;
}
.panel--paper .tag--new{background:#0F6B5C;border-color:#0F6B5C;color:#E9FFF9}
.panel--paper .tag--diff{background:var(--amber);border-color:var(--amber);color:#2A1B05}
.panel--paper .anchor-num{color:var(--brown)}
.note{
  display:flex;
  gap:12px;
  padding:14px 18px;
  border-radius:var(--r-s);
  border-left:3px solid var(--amber);
  background:rgba(242,169,59,.09);
  color:#F0DCBE;
  font-size:14.5px;
  line-height:1.7;
}
.empty-state{
  padding:22px 24px;
  border:1px dashed var(--line);
  border-radius:var(--r-m);
  background:rgba(17,28,47,.55);
  color:var(--mist);
  font-size:14.5px;
  line-height:1.7;
}

/* ---------- tags / mono / anchors ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(17,28,47,.7);
  color:var(--mist);
  font:600 12px/1.4 var(--font-mono);
  letter-spacing:.06em;
  white-space:nowrap;
}
.tag--new{background:var(--cyan);border-color:var(--cyan);color:var(--cyan-ink)}
.tag--diff{background:var(--amber);border-color:var(--amber);color:#2A1B05}
.tag--alert{background:var(--ember);border-color:var(--ember);color:#FFF3EF}
.tag--old{background:transparent;border-color:var(--line);color:var(--mist)}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.03em;
}
.anchor-num{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(2.2rem,5vw,3.4rem);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--white);
}
.anchor-num--amber{color:var(--amber)}

/* ---------- buttons & chips ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 22px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(17,28,47,.8);
  color:var(--white);
  font:600 14.5px/1 var(--font-body);
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.btn:hover{color:var(--cyan);border-color:var(--cyan)}
.btn--primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--cyan-ink);
}
.btn--primary:hover{background:#6BF6DF;border-color:#6BF6DF;color:#04211C}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 15px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(17,28,47,.72);
  color:var(--mist);
  font:600 13px/1.3 var(--font-body);
  letter-spacing:.02em;
  cursor:pointer;
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.chip:hover{color:var(--white);border-color:#2E4468}
.chip[aria-pressed="true"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--cyan-ink);
}
.compare-switch{
  display:inline-flex;
  flex-wrap:wrap;
  gap:4px;
  padding:5px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(11,18,32,.72);
}
.compare-switch .chip{border-color:transparent;background:transparent}
.compare-switch .chip:hover{background:rgba(30,44,68,.8)}
[data-compare-root][data-view="new"] [data-compare-cell="old"]{display:none}
[data-compare-root][data-view="old"] [data-compare-cell="new"]{display:none}
[data-compare-root][data-view="diff"] [data-compare-row="same"]{display:none}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font:500 12.5px/1.5 var(--font-mono);
  letter-spacing:.08em;
  color:var(--mist);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:#3A4C6B}
.breadcrumb a{color:var(--mist);text-decoration:none;transition:color .18s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--white)}

/* ---------- media frame ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/10;
  overflow:hidden;
  border-radius:var(--r-m);
  border:1px solid var(--line);
  background-color:var(--panel);
  background-image:
    linear-gradient(135deg, rgba(61,240,210,.12), transparent 55%),
    repeating-linear-gradient(to right, rgba(30,44,68,.9) 0 1px, transparent 1px 22px),
    repeating-linear-gradient(to bottom, rgba(30,44,68,.9) 0 1px, transparent 1px 22px);
}
.media-frame > img,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--caption{
  margin:10px 0 0;
  font:500 12.5px/1.6 var(--font-mono);
  letter-spacing:.04em;
  color:var(--mist);
}
@media (max-width:640px){
  .media-frame{aspect-ratio:4/3}
  .media-frame--square{aspect-ratio:1/1}
}

/* ---------- header ---------- */
.site-header{
  position:relative;
  z-index:90;
}
.header-upper{
  background:linear-gradient(180deg,rgba(9,15,25,.98),rgba(11,18,32,.9));
  border-bottom:1px solid var(--line-soft);
}
.header-upper__inner{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:14px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:inherit;
  min-width:0;
}
.brand__mark{
  position:relative;
  flex:0 0 auto;
  width:32px;
  height:32px;
  border-radius:10px;
  border:1px solid #2C3E5E;
  background:
    linear-gradient(160deg,rgba(61,240,210,.20),rgba(11,18,32,0) 62%),
    var(--panel);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.03);
}
.brand__mark::before{
  content:"";
  position:absolute;
  left:6px;
  top:6px;
  width:8px;
  height:8px;
  border-radius:2px;
  background:var(--cyan);
  box-shadow:0 0 10px rgba(61,240,210,.65);
}
.brand__mark::after{
  content:"";
  position:absolute;
  right:6px;
  bottom:6px;
  width:12px;
  height:7px;
  border-radius:2px;
  background:var(--amber);
  opacity:.92;
}
.brand__text{display:flex;flex-direction:column;min-width:0}
.brand__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:19px;
  line-height:1.2;
  letter-spacing:.06em;
  color:var(--white);
}
.brand__tagline{
  font:500 10.5px/1.5 var(--font-mono);
  letter-spacing:.16em;
  color:var(--mist);
  white-space:nowrap;
}
.version-chip{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:8px 15px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(17,28,47,.9);
  white-space:nowrap;
}
.version-chip__dot{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 4px rgba(61,240,210,.14);
}
.version-chip__label{
  font:500 10.5px/1 var(--font-mono);
  letter-spacing:.16em;
  color:var(--mist);
}
.version-chip__value{
  font:700 13px/1 var(--font-mono);
  letter-spacing:.06em;
  color:var(--white);
}
.version-chip__value--amber{color:var(--amber)}
.version-chip__sep{width:1px;height:14px;background:var(--line)}

.header-nav{
  position:sticky;
  top:0;
  z-index:90;
  background:rgba(11,18,32,.93);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  transition:box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.header-nav.is-stuck{
  border-bottom-color:#2A3C5C;
  box-shadow:0 14px 32px -20px #000;
}
.header-nav__inner{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:0 var(--gutter);
  min-height:58px;
  display:flex;
  align-items:center;
  gap:12px;
}
.nav{flex:1 1 auto;min-width:0}
.nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:2px;
}
.nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 14px;
  border-radius:999px;
  color:var(--mist);
  text-decoration:none;
  font:500 14.5px/1 var(--font-body);
  letter-spacing:.03em;
  transition:color .18s var(--ease),background .18s var(--ease);
}
.nav__link::before{
  content:"";
  width:5px;
  height:5px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--cyan);
  opacity:0;
  transform:scale(.4);
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.nav__link::after{
  content:"";
  position:absolute;
  left:14px;
  right:14px;
  bottom:4px;
  height:2px;
  border-radius:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease);
}
.nav__link:hover{color:var(--white);background:rgba(30,44,68,.7)}
.nav__link[aria-current="page"]{color:var(--cyan)}
.nav__link[aria-current="page"]::before{opacity:1;transform:scale(1);box-shadow:0 0 8px rgba(61,240,210,.8)}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-height:42px;
  padding:9px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(17,28,47,.9);
  color:var(--white);
  font:600 14px/1 var(--font-body);
  cursor:pointer;
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:var(--cyan)}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}
.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.scroll-meter__bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  transition:transform .12s linear;
}

@media (max-width:880px){
  .header-upper__inner{padding-block:12px;gap:12px}
  .nav-toggle{display:inline-flex}
  .header-nav__inner{
    flex-direction:column;
    align-items:stretch;
    min-height:0;
    padding-block:10px;
    gap:0;
  }
  .nav{display:none}
  .site-header[data-open="true"] .nav{display:block;padding-top:10px}
  .nav__list{flex-direction:column;align-items:stretch;gap:6px}
  .nav__link{
    width:100%;
    padding:12px 16px;
    border:1px solid var(--line);
    border-radius:12px;
    background:rgba(17,28,47,.65);
    font-size:15px;
  }
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{
    border-color:var(--cyan);
    background:rgba(61,240,210,.08);
  }
  .version-chip__label,
  .version-chip__sep{display:none}
  .version-chip{padding:7px 12px;gap:8px}
}
@media (max-width:560px){
  .brand__tagline{display:none}
  .brand__name{font-size:17px}
  .version-chip__value--amber{font-size:12px}
  .nav-toggle__text{font-size:13px}
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,104px);
  overflow:hidden;
  background:linear-gradient(180deg,#0A101C 0%,#0B1220 42%,#080E18 100%);
  border-top:1px solid var(--line);
  color:var(--white);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan),var(--amber),transparent);
  opacity:.75;
}
.site-footer::after{
  content:"";
  position:absolute;
  right:-70px;
  bottom:-90px;
  width:340px;
  height:340px;
  border-radius:50%;
  background-image:radial-gradient(rgba(61,240,210,.22) 1px,transparent 1.4px);
  background-size:12px 12px;
  opacity:.5;
  pointer-events:none;
}
.footer__inner{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(40px,6vw,64px) var(--gutter) 0;
}
.footer__grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1.25fr;
  gap:clamp(26px,4vw,56px);
}
.footer__col{min-width:0}
.footer__brand{
  font-family:var(--font-display);
  font-weight:800;
  font-size:21px;
  letter-spacing:.06em;
  color:var(--white);
  margin-bottom:10px;
}
.footer__lead{
  color:var(--mist);
  font-size:14.5px;
  line-height:1.75;
  max-width:28ch;
  margin-bottom:14px;
}
.footer__hours{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12.5px;
  color:var(--cyan);
  letter-spacing:.06em;
}
.footer__hours .mono{font-size:12.5px}
.footer__title{
  font:600 11px/1 var(--font-mono);
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--cyan);
  margin-bottom:14px;
}
.footer__title--gap{margin-top:26px}
.footer__links{display:flex;flex-wrap:wrap;gap:6px 18px}
.footer__link{
  display:inline-block;
  color:var(--mist);
  font-size:14.5px;
  text-decoration:none;
  padding:3px 0;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer__link:hover{color:var(--cyan);border-bottom-color:rgba(61,240,210,.6)}
.footer__info{display:flex;flex-direction:column;gap:12px}
.footer__info-item{
  display:flex;
  flex-direction:column;
  gap:3px;
  font-size:14.5px;
  line-height:1.6;
  color:var(--white);
  overflow-wrap:anywhere;
}
.footer__info-label{
  font:500 10.5px/1 var(--font-mono);
  letter-spacing:.16em;
  color:var(--mist);
  text-transform:uppercase;
}
.footer__meta{
  margin-top:clamp(30px,4vw,46px);
  padding-block:20px 26px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  font-size:13px;
  color:var(--mist);
}
.footer__icp{
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:var(--r-s);
  color:var(--white);
  font-size:12px;
  letter-spacing:.08em;
}
.footer__note{line-height:1.7}
.footer__copy{margin-left:auto;font-family:var(--font-mono);letter-spacing:.06em}
@media (max-width:900px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:620px){
  .footer__grid{grid-template-columns:minmax(0,1fr);gap:30px}
  .footer__copy{margin-left:0}
  .footer__meta{flex-direction:column;align-items:flex-start;gap:10px}
}

/* ---------- reduced motion ---------- */
@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;
  }
}