:root{
  --deep:#050B1A;
  --hull:#0A1830;
  --blueprint:#1D3A5F;
  --foam:#F4FBFF;
  --coral:#FF5D3A;
  --cyan:#22E6D3;
  --lime:#F5FF4A;
  --alert:#FF3B5C;
  --steel:#7C93B3;
  --buoy:#101F3A;
  --ink:#AFC2D8;
  --rail-w:180px;
  --rail-h:56px;
  --maxw:1180px;
  --font-display:"Source Han Sans SC Heavy","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","SF Mono",ui-monospace,Menlo,Consolas,monospace;
  --font-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--foam);
  background-color:var(--deep);
  background-image:
    radial-gradient(1100px 620px at 84% -8%, rgba(34,230,211,.10), transparent 66%),
    radial-gradient(880px 540px at -14% 32%, rgba(255,93,58,.10), transparent 68%),
    linear-gradient(to right, rgba(29,58,95,.32) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29,58,95,.32) 1px, transparent 1px);
  background-size:auto,auto,76px 76px,76px 76px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block;}
h1,h2,h3,h4,h5,h6{
  margin:0 0 .6em;
  font-family:var(--font-display);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.14;
  color:var(--foam);
}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
ul,ol{margin:0 0 1em;padding-left:1.25em;}
a{color:var(--cyan);text-decoration:none;transition:color .18s ease;}
a:hover{color:var(--lime);}
button{font:inherit;color:inherit;background:none;border:0;}
figure{margin:0;}
hr{border:0;}
:focus-visible{outline:3px solid var(--lime);outline-offset:2px;}
#main-content{scroll-margin-top:24px;}

.skip-link{
  position:fixed;
  top:-120px;
  left:16px;
  z-index:300;
  display:inline-block;
  padding:10px 18px;
  background:var(--lime);
  color:#0B0F02;
  font-weight:800;
  letter-spacing:.04em;
  border:2px solid #0B0F02;
  box-shadow:5px 5px 0 rgba(5,11,26,.9);
}
.skip-link:focus{top:14px;color:#0B0F02;}

.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

/* ---------- layout ---------- */
.wrap{width:min(var(--maxw),100% - 40px);margin-inline:auto;}
.wrap--narrow{width:min(760px,100% - 40px);margin-inline:auto;}
.sec{padding:64px 0;}
.sec__head{display:flex;flex-direction:column;gap:12px;max-width:780px;margin-bottom:34px;}
.sec__title{font-size:clamp(26px,4.2vw,44px);margin:0;}
.sec__lede{color:var(--ink);font-size:15.5px;max-width:64ch;margin:0;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--coral);flex:none;}
.rule{
  height:2px;border:0;margin:0;
  background:repeating-linear-gradient(90deg,var(--blueprint) 0 8px,transparent 8px 15px);
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}

.tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.12em;
  padding:3px 9px;
  border:1px solid var(--blueprint);
  color:var(--steel);
  background:rgba(29,58,95,.28);
}
.tag--coral{border-color:var(--coral);color:var(--coral);background:rgba(255,93,58,.1);}
.tag--cyan{border-color:var(--cyan);color:var(--cyan);background:rgba(34,230,211,.1);}
.tag--lime{border-color:var(--lime);color:var(--lime);background:rgba(245,255,74,.12);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-body);font-weight:700;font-size:14px;letter-spacing:.05em;
  padding:12px 18px;
  border:2px solid transparent;
  cursor:pointer;
  text-decoration:none;
  transition:transform .16s ease,box-shadow .16s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn--primary{
  background:var(--coral);
  color:#170601;
  box-shadow:5px 5px 0 rgba(34,230,211,.3);
}
.btn--primary:hover{color:#170601;transform:translate(-2px,-2px);box-shadow:8px 8px 0 rgba(34,230,211,.42);}
.btn--primary:active{transform:translate(1px,1px);box-shadow:2px 2px 0 rgba(34,230,211,.3);}
.btn--ghost{
  background:transparent;
  color:var(--foam);
  border-color:var(--blueprint);
}
.btn--ghost:hover{color:var(--cyan);border-color:var(--cyan);box-shadow:5px 5px 0 rgba(34,230,211,.16);}
.btn--block{width:100%;}

/* ---------- grid ---------- */
.grid{display:grid;gap:22px;}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--asym{grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);}

/* ---------- buoy card ---------- */
.card{
  position:relative;
  background:var(--buoy);
  border:2px solid var(--blueprint);
  padding:24px 22px 26px;
  box-shadow:9px 9px 0 rgba(5,11,26,.92);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card:hover{transform:translate(-3px,-3px);box-shadow:13px 13px 0 rgba(5,11,26,.96);border-color:var(--cyan);}
.card__idx{
  position:absolute;top:0;right:0;
  padding:2px 9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--steel);
  background:var(--hull);
  border-left:2px solid var(--blueprint);
  border-bottom:2px solid var(--blueprint);
}
.card__title{font-size:20px;margin:14px 0 8px;}
.card__text{color:var(--ink);font-size:14.5px;margin:0;}

/* ---------- steps ---------- */
.steps{display:flex;flex-direction:column;border-top:2px solid var(--blueprint);}
.steps__item{border-bottom:1px solid var(--blueprint);}
.steps__head{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:16px;
  width:100%;
  padding:18px 4px;
  text-align:left;
  cursor:pointer;
  color:var(--foam);
}
.steps__num{font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;color:var(--coral);}
.steps__title{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(18px,2.4vw,24px);
  letter-spacing:-.01em;
  transition:color .2s ease;
}
.steps__head:hover .steps__title{color:var(--lime);}
.steps__sign{position:relative;width:14px;height:14px;flex:none;}
.steps__sign::before,.steps__sign::after{content:"";position:absolute;left:50%;top:50%;background:var(--cyan);}
.steps__sign::before{width:14px;height:2px;transform:translate(-50%,-50%);}
.steps__sign::after{width:2px;height:14px;transform:translate(-50%,-50%);transition:transform .25s ease,opacity .25s ease;}
.steps__item[data-open] .steps__sign::after{transform:translate(-50%,-50%) scaleY(0);opacity:0;}
.steps__body{
  max-height:0;
  overflow:hidden;
  opacity:0;
  padding:0 4px;
  transition:max-height .34s ease,opacity .24s ease,padding .34s ease;
}
.steps__item[data-open] .steps__body{max-height:24em;opacity:1;padding-bottom:20px;}
.steps__body p{color:var(--ink);font-size:14.5px;max-width:66ch;}

/* ---------- faq ---------- */
.faq{display:grid;gap:12px;}
.faq__item{
  background:rgba(16,31,58,.7);
  border:2px solid var(--blueprint);
  border-left-width:5px;
  transition:border-color .2s ease,background .2s ease;
}
.faq__item[data-open]{border-left-color:var(--coral);background:rgba(16,31,58,.96);}
.faq__q{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  width:100%;padding:16px 18px;
  text-align:left;cursor:pointer;
  font-weight:700;font-size:15.5px;color:var(--foam);
}
.faq__q::after{content:"＋";font-family:var(--font-mono);color:var(--cyan);transition:transform .25s ease;}
.faq__item[data-open] .faq__q::after{transform:rotate(45deg);}
.faq__a{max-height:0;overflow:hidden;opacity:0;transition:max-height .3s ease,opacity .22s ease;}
.faq__item[data-open] .faq__a{max-height:30em;opacity:1;}
.faq__a-inner{padding:0 18px 18px;color:var(--ink);font-size:14.5px;}

/* ---------- figure ---------- */
.fig{display:block;}
.fig__frame{
  position:relative;
  overflow:hidden;
  border:2px solid var(--blueprint);
  background:var(--hull);
  box-shadow:10px 10px 0 rgba(5,11,26,.9);
}
.fig__frame::after{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background:linear-gradient(150deg,rgba(34,230,211,.16),transparent 46%,rgba(255,93,58,.18));
  mix-blend-mode:screen;
}
.fig__img{
  display:block;width:100%;height:auto;
  aspect-ratio:16/10;
  object-fit:cover;
  background:linear-gradient(140deg,#0A1830,#050B1A);
}
.fig__img--tall{aspect-ratio:4/5;}
.fig__img--wide{aspect-ratio:21/9;}
.fig__cap{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.12em;
  color:var(--steel);
}

/* ---------- breadcrumb ---------- */
.crumb{padding:22px 0 0;}
.crumb__list{
  display:flex;flex-wrap:wrap;gap:8px;
  list-style:none;margin:0;padding:0;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--steel);
}
.crumb__list li{display:flex;align-items:center;gap:8px;}
.crumb__list li + li::before{content:"//";color:var(--blueprint);}
.crumb__link{color:var(--steel);}
.crumb__link:hover{color:var(--cyan);}

/* ---------- reveal ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .5s ease,transform .5s cubic-bezier(.22,.8,.28,1);
  transition-delay:calc(var(--d,0) * 70ms);
}
[data-reveal].is-in{opacity:1;transform:none;}

/* ---------- header rail ---------- */
.rail{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail-w);
  z-index:60;
  display:flex;
  flex-direction:column;
  padding:22px 0 18px;
  background:linear-gradient(180deg,#08152B 0%,#0A1830 100%);
  border-right:2px solid var(--blueprint);
}
.rail::after{
  content:"";
  position:absolute;
  top:0;right:-2px;
  width:2px;height:100%;
  pointer-events:none;
  background:repeating-linear-gradient(to bottom,var(--cyan) 0 2px,transparent 2px 16px);
  opacity:.35;
}
.rail__brand{padding:0 18px 20px;border-bottom:1px solid var(--blueprint);}
.brand{display:flex;flex-direction:column;gap:12px;color:inherit;text-decoration:none;}
.brand:hover{color:inherit;}
.brand__mark{
  width:44px;height:44px;
  display:grid;place-items:center;
  background:var(--coral);
  color:#170601;
  font-family:var(--font-display);
  font-weight:900;
  font-size:22px;
  letter-spacing:-.04em;
  box-shadow:5px 5px 0 rgba(34,230,211,.34);
  clip-path:polygon(0 0,100% 0,100% 76%,76% 100%,0 100%);
}
.brand__type{display:flex;flex-direction:column;gap:2px;min-width:0;}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:17px;
  letter-spacing:-.03em;
  color:var(--foam);
  line-height:1.25;
}
.brand__tagline{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--steel);
  line-height:1.4;
}
.rail__toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 12px;
  background:rgba(34,230,211,.07);
  border:2px solid var(--blueprint);
  color:var(--foam);
  font-size:13px;
  font-weight:700;
  cursor:pointer;
  transition:border-color .2s ease,background .2s ease;
}
.rail__toggle:hover{border-color:var(--cyan);background:rgba(34,230,211,.14);}
.rail__bars{display:grid;gap:4px;width:20px;flex:none;}
.rail__bars i{display:block;height:2px;width:100%;background:var(--foam);transition:transform .25s ease,opacity .25s ease,width .25s ease;}
.rail__bars i:nth-child(2){width:70%;background:var(--cyan);}
.rail[data-open] .rail__bars i:nth-child(1){transform:translateY(6px) rotate(45deg);}
.rail[data-open] .rail__bars i:nth-child(2){opacity:0;}
.rail[data-open] .rail__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.railnav{
  position:relative;
  z-index:2;
  flex:1 1 auto;
  overflow-y:auto;
  padding:16px 0 8px;
}
.railnav__caption{
  margin:0 0 10px;
  padding:0 18px;
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.2em;
  color:var(--blueprint);
}
.railnav__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;}
.railnav__link{
  display:grid;
  grid-template-columns:30px 1fr;
  align-items:center;
  gap:8px;
  padding:11px 16px;
  border-left:3px solid transparent;
  color:#A7BCD6;
  font-size:14px;
  font-weight:600;
  line-height:1.4;
  transition:color .18s ease,background .18s ease,border-color .18s ease;
}
.railnav__link:hover{color:var(--foam);background:rgba(34,230,211,.06);}
.railnav__idx{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.06em;
  color:var(--steel);
  transition:color .18s ease;
}
.railnav__label{min-width:0;}
.railnav__link[aria-current="page"]{
  color:var(--coral);
  background:rgba(255,93,58,.1);
  border-left-color:var(--coral);
}
.railnav__link[aria-current="page"] .railnav__idx{color:var(--coral);}

.rail__foot{
  margin-top:auto;
  padding:16px 16px 0;
  border-top:1px solid var(--blueprint);
  display:flex;
  flex-direction:column;
  gap:12px;
}
.rail__note{
  margin:0;
  font-size:11px;
  line-height:1.6;
  color:var(--steel);
}
.rail__progress{
  position:absolute;
  top:0;right:0;
  width:2px;height:100%;
  z-index:3;
  transform:scaleY(0);
  transform-origin:top center;
  background:linear-gradient(180deg,var(--cyan),var(--coral));
}
.rail__scrim{
  position:fixed;
  inset:0;
  z-index:1;
  display:none;
  background:rgba(3,7,16,.74);
  opacity:0;
  pointer-events:none;
  transition:opacity .3s ease;
}
@media (min-width:901px){
  body{padding-left:var(--rail-w);}
  .railnav{scrollbar-width:thin;}
}

/* ---------- footer ---------- */
.foot{
  position:relative;
  margin-top:84px;
  padding:0 0 26px;
  background:linear-gradient(180deg,rgba(10,24,48,.94),rgba(5,11,26,.99));
  border-top:2px solid var(--blueprint);
}
.foot::before{
  content:"";
  position:absolute;
  top:-2px;left:0;right:0;
  height:3px;
  background:linear-gradient(90deg,var(--coral),var(--cyan) 42%,transparent 82%);
}
.foot__inner{padding-top:52px;}
.foot__grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1fr);
  gap:40px 32px;
}
.foot__logo{
  font-family:var(--font-display);
  font-weight:900;
  font-size:22px;
  letter-spacing:-.02em;
  margin:0 0 8px;
}
.foot__slogan{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--coral);
  margin:0 0 22px;
}
.foot__label{
  display:block;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--steel);
  margin-bottom:8px;
}
.copy-btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
  max-width:100%;
  padding:9px 14px;
  background:rgba(34,230,211,.07);
  border:2px solid var(--blueprint);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  text-align:left;
  cursor:pointer;
  transition:border-color .2s ease,color .2s ease,background .2s ease;
}
.copy-btn:hover{border-color:var(--cyan);background:rgba(34,230,211,.14);}
.copy-btn[data-copied="true"]{border-color:var(--lime);color:var(--lime);background:rgba(245,255,74,.1);}
.copy-btn__value{overflow-wrap:anywhere;}
.copy-btn__hint{
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--steel);
}
.copy-btn[data-copied="true"] .copy-btn__hint{color:var(--lime);}
.foot__info{
  margin-top:20px;
  display:grid;
  gap:6px;
  font-size:13px;
  color:#9FB4CE;
}
.foot__info span{display:block;}
.foot__col{min-width:0;}
.foot__nav-title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--steel);
  margin:0 0 16px;
}
.foot__list{list-style:none;margin:0;padding:0;display:grid;gap:10px;}
.foot__list a{
  color:#C6D6E8;
  font-size:14px;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.foot__list a:hover{color:var(--lime);border-bottom-color:var(--lime);}
.foot__base{
  margin-top:44px;
  padding-top:20px;
  border-top:1px solid var(--blueprint);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 22px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--steel);
}
.foot__base p{margin:0;}
.foot__ipc{color:var(--steel);}
.foot__legal{flex:1 1 320px;color:#6E86A6;}

/* ---------- responsive ---------- */
@media (max-width:1100px) and (min-width:901px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:900px){
  .rail{
    position:sticky;
    top:0;left:0;right:0;bottom:auto;
    width:100%;
    height:var(--rail-h);
    flex-direction:row;
    align-items:center;
    gap:12px;
    padding:0 14px;
    border-right:0;
    border-bottom:2px solid var(--blueprint);
    background:#08152B;
  }
  .rail::after{display:none;}
  .rail__brand{flex:1 1 auto;min-width:0;padding:0;border-bottom:0;}
  .brand{flex-direction:row;align-items:center;gap:10px;}
  .brand__mark{width:34px;height:34px;font-size:17px;box-shadow:3px 3px 0 rgba(34,230,211,.34);}
  .brand__name{font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
  .brand__tagline{display:none;}
  .rail__toggle{display:inline-flex;flex:none;}
  .rail__toggle-text{display:none;}
  .rail__foot{display:none;}
  .rail__progress{display:none;}
  .rail__scrim{display:block;}
  .rail[data-open] .rail__scrim{opacity:1;pointer-events:auto;}
  .railnav{
    position:fixed;
    top:var(--rail-h);left:0;bottom:0;
    width:min(84vw,330px);
    z-index:75;
    padding:14px 0 24px;
    overflow-y:auto;
    background:#071228;
    border-right:2px solid var(--blueprint);
    transform:translateX(-104%);
    transition:transform .32s cubic-bezier(.22,.8,.28,1);
  }
  .railnav[data-open]{transform:none;box-shadow:18px 0 44px rgba(0,0,0,.62);}
  .railnav__caption{padding:0 20px;}
  .railnav__link{grid-template-columns:32px 1fr;padding:15px 20px;font-size:15.5px;}
  .foot{margin-top:56px;}
  .foot__grid{grid-template-columns:minmax(0,1fr);gap:32px;}
  .foot__inner{padding-top:40px;}
  .foot__base{flex-direction:column;align-items:flex-start;}
  .grid--2,.grid--3,.grid--asym{grid-template-columns:minmax(0,1fr);}
  .sec{padding:48px 0;}
}
@media (max-width:420px){
  .brand__name{font-size:14px;}
  .copy-btn{width:100%;justify-content:space-between;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important;}
  .steps__body,.faq__a{transition:none !important;}
}