@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root{
  --bg:#0B0B0B;
  --acid:#D7FF3B;
  --ink:#F5F5F5;
  --dim:rgba(245,245,245,.6);
  --line:rgba(245,245,245,.13);
  --glass:rgba(245,245,245,.045);
  --r:28px;
  --pad:clamp(16px,4vw,44px);
  --font:"Space Grotesk",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

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

html{background:var(--bg);scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:transparent;
  color:var(--ink);
  font-family:var(--font);
  font-size:17px;
  line-height:1.7;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:radial-gradient(rgba(215,255,59,.24) 1px,transparent 1px);
  background-size:24px 24px;
  opacity:.5;
  -webkit-mask-image:radial-gradient(130% 95% at 18% 0%,#000 25%,transparent 88%);
  mask-image:radial-gradient(130% 95% at 18% 0%,#000 25%,transparent 88%);
}

a{color:var(--ink)}
img,svg{max-width:100%}
:focus-visible{outline:2px solid var(--acid);outline-offset:3px;border-radius:8px}

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:60;
  padding:12px 22px;
  background:var(--acid);
  color:#0B0B0B;
  font-weight:600;
  text-decoration:none;
  border-radius:0 0 16px 0;
}
.skip:focus{left:0}

/* ---------- header rail ---------- */
.rail{
  position:sticky;
  top:0;
  z-index:40;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:12px var(--pad) 14px;
  background:rgba(11,11,11,.84);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:40px;
  align-self:flex-start;
  text-decoration:none;
  font-size:21px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--ink);
}
.brand b{font-weight:700}
.brand::before{
  content:"";
  width:11px;
  height:11px;
  border-radius:50%;
  background:var(--acid);
  box-shadow:0 0 16px rgba(215,255,59,.9);
  flex:none;
}

.nav p{
  display:flex;
  gap:8px;
  margin:0;
  padding:0 0 2px;
  overflow-x:auto;
  scrollbar-width:none;
}
.nav p::-webkit-scrollbar{display:none}

.nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 16px;
  white-space:nowrap;
  font-size:16px;
  text-decoration:none;
  color:var(--ink);
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:999px;
  transition:background .25s,color .25s,border-color .25s,transform .25s;
}
.nav a:hover,.nav a:focus-visible{
  background:var(--acid);
  border-color:var(--acid);
  color:#0B0B0B;
  transform:translateY(-2px);
}

/* ---------- main / hero ---------- */
main{position:relative;z-index:1}
.wrap{max-width:1260px;margin:0 auto;padding:0 var(--pad)}

.hero{
  display:flex;
  align-items:center;
  min-height:70vh;
  padding:clamp(26px,7vh,70px) 0 clamp(24px,5vh,48px);
}

.hero-in{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:clamp(18px,4vw,48px);
  width:100%;
}

.hero-type{flex:1 1 320px;min-width:0}

.kin{
  display:flex;
  flex-wrap:wrap;
  gap:0 .02em;
  margin:0;
  font-size:clamp(38px,9.6vw,102px);
  font-weight:700;
  line-height:.98;
  letter-spacing:-.03em;
  text-transform:uppercase;
}
.kin .ch{
  display:inline-block;
  background:linear-gradient(175deg,#fff 26%,var(--acid) 118%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  animation:rise .64s cubic-bezier(.19,.78,.24,1) backwards;
  animation-delay:calc(var(--i) * 46ms);
  transition:transform .3s ease;
}
.kin:hover .ch{transform:translateY(-.06em)}

@keyframes rise{
  from{opacity:0;transform:translateY(.66em) rotate(4deg)}
  to{opacity:1;transform:none}
}

.lede{
  max-width:44ch;
  margin:20px 0 0;
  color:var(--dim);
  font-size:clamp(16px,1.9vw,19px);
  line-height:1.65;
}

.mark{
  flex:0 0 auto;
  width:clamp(74px,12vw,146px);
  height:auto;
  animation:spin 22s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- split / content ---------- */
.split{display:grid;gap:24px;padding-bottom:clamp(40px,7vw,80px)}

.flow{min-width:0}

.flow > div{
  position:relative;
  margin:0 0 20px;
  padding:clamp(20px,3.2vw,38px);
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  scroll-margin-top:118px;
  transition:border-color .35s,background .35s;
}
.flow > div:hover{border-color:rgba(215,255,59,.34);background:rgba(245,245,245,.065)}
.flow > div:last-child{margin-bottom:0}

.flow h2,.flow h3{
  margin:0 0 14px;
  line-height:1.22;
  letter-spacing:-.01em;
  font-weight:700;
}
.flow h2{font-size:clamp(23px,3.4vw,34px)}
.flow h3{font-size:clamp(19px,2.4vw,24px);color:var(--acid)}
.flow h2 > span,.flow h3 > span{position:relative;display:inline-block}
.flow h2 > span::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-7px;
  width:100%;
  height:3px;
  border-radius:3px;
  background:var(--acid);
  transform:scaleX(.26);
  transform-origin:left;
  transition:transform .55s cubic-bezier(.2,.8,.2,1);
}
.flow div:hover h2 > span::after{transform:scaleX(1)}

.flow p{margin:0 0 15px;color:#DEDEDE}
.flow p:last-child{margin-bottom:0}
.flow a{color:var(--acid);text-underline-offset:3px}
.flow ul,.flow ol{pargin:0 0 15px;padding-left:1.35em;color:#DEDEDE}
.flow li{margin-bottom:7px}
.flow ul{list-style:none;padding-left:0}
.flow ul > li{position:relative;padding-left:1.4em}
.flow ul > li::before{content:"";position:absolute;left:.2em;top:.72em;width:8px;height:2px;background:var(--acid)}
.flow img{display:block;width:auto;max-width:100%;height:auto;margin:18px 0;border-radius:18px;border:1px solid var(--line)}
.flow blockquote{
  margin:0 0 15px;
  padding:14px 20px;
  border-left:3px solid var(--acid);
  background:rgba(215,255,59,.07);
  border-radius:0 18px 18px 0;
  color:#E7E7E7;
}
.flow table{width:100%;border-collapse:collapse;margin:0 0 15px;font-size:16px}
.flow th,.flow td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
.flow th{color:var(--acid);font-weight:600}
.flow code{padding:2px 6px;border-radius:8px;background:rgba(245,245,245,.1);font-size:.94em}

/* ---------- aside ---------- */
.side{
  align-self:start;
  padding:20px 18px;
  background:rgba(215,255,59,.06);
  border:1px solid rgba(215,255,59,.3);
  border-radius:var(--r);
}
.side-h{
  margin:0 0 12px;
  font-size:16px;
  font-weight:600;
  letter-spacing:.3em;
  color:var(--acid);
}
.side-h > span{display:inline-block}
.side-list{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.side-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 10px;
  border-radius:14px;
  text-decoration:none;
  font-size:16px;
  transition:background .22s,color .22s;
}
.side-list .n{
  flex:none;
  font-size:14px;
  letter-spacing:.08em;
  font-variant-numeric:tabular-nums;
  color:var(--acid);
}
.side-list a:hover,.side-list a:focus-visible{background:var(--acid);color:#0B0B0B}
.side-list a:hover .n,.side-list a:focus-visible .n{color:#0B0B0B}

/* ---------- footer ---------- */
.foot{
  margin-top:clamp(20px,4vw,40px);
  padding:clamp(28px,5vw,56px) 0 22px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(215,255,59,.05),transparent 60%);
}
.foot-grid{display:grid;gap:26px 20px;grid-template-columns:1fr 1fr}
.fmark-col{grid-column:1 / -1}
.fmark{
  margin:0;
  font-size:clamp(48px,11vw,96px);
  line-height:.88;
  letter-spacing:-.045em;
  font-weight:700;
  color:var(--acid);
}
.fmark > span{display:inline-block}

.fcol{margin:0}
.fcol dt{
  margin-bottom:10px;
  font-size:16px;
  letter-spacing:.22em;
  color:rgba(245,245,245,.5);
}
.fcol dd{margin:0 0 2px;font-size:16px;color:#DEDEDE}
.fcol dd a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:4px 0;
  text-decoration:none;
  color:#DEDEDE;
  transition:color .2s,transform .2s;
}
.fcol dd a:hover,.fcol dd a:focus-visible{color:var(--acid);transform:translateX(4px)}

.fbar{
  margin-top:26px;
  padding-top:14px;
  border-top:1px solid var(--line);
  color:rgba(245,245,245,.45);
  font-size:16px;
}
.fbar p{margin:0}

/* ---------- reveal ---------- */
.js .flow > div{opacity:0;transform:translateY(20px)}
.js .flow > div.in{
  opacity:1;
  transform:none;
  transition:opacity .62s ease,transform .62s cubic-bezier(.2,.8,.2,1),border-color .35s,background .35s;
}

/* ---------- desktop rail ---------- */
@media (min-width:960px){
  .rail{
    position:fixed;
    inset:0 auto 0 0;
    width:242px;
    padding:32px 20px;
    gap:26px;
    justify-content:flex-start;
    overflow-y:auto;
    border-bottom:0;
    border-right:1px solid var(--line);
    background:rgba(11,11,11,.92);
  }
  .nav p{flex-direction:column;overflow:visible;padding-bottom:0}
  .nav a{width:100%;justify-content:flex-start}
  main{margin-left:242px}
  .foot{margin-left:242px}
  .hero{min-height:70vh}
  .flow > div{scroll-margin-top:32px}
  .split{grid-template-columns:minmax(0,1fr) 274px;align-items:start;gap:30px}
  .side{position:sticky;top:28px}
}

@media (min-width:760px){
  .foot-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .kin .ch{animation:none;opacity:1;transform:none}
  .mark{animation:none}
  .js .flow > div{opacity:1;transform:none}
  .flow h2 > span::after{transform:scaleX(1)}
  .nav a:hover{transform:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}