:root{
  --ink:#07121F;
  --deep:#0A1B2E;
  --deep-mid:#123A5A;
  --paper:#F2F4F7;
  --cyan:#5FE3CF;
  --lava:#FF5C29;
  --violet:#8E8AA6;
  --violet-deep:#4A4560;
  --steel:#C9D6E4;
  --white:#FFFFFF;
  --ink-muted:#495064;
  --ink-teal:#0B6B60;
  --line:rgba(201,214,228,.16);
  --line-strong:rgba(201,214,228,.34);
  --rail-w:88px;
  --topbar-h:64px;
  --maxw:1280px;
  --ff-head:'Oswald','Noto Sans SC','PingFang SC',sans-serif;
  --ff-body:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --ff-mono:'JetBrains Mono','Roboto Mono',ui-monospace,monospace;
  --ease:cubic-bezier(.22,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ol,ul{margin:0}
ol,ul{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
[hidden]{display:none!important}

body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--ff-body);
  font-size:16px;
  line-height:1.75;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(201,214,228,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(201,214,228,.05) 1px,transparent 1px);
  background-size:96px 96px;
  -webkit-mask-image:radial-gradient(circle at 62% 8%,#000 0%,transparent 76%);
  mask-image:radial-gradient(circle at 62% 8%,#000 0%,transparent 76%);
}
main{position:relative;z-index:1;display:block}
#main-content:focus{outline:none}

h1,h2,h3,h4{font-family:var(--ff-head);font-weight:700;line-height:1.14;letter-spacing:.06em;text-transform:uppercase}
h1{font-size:clamp(32px,5.2vw,54px)}
h2{font-size:clamp(25px,3.4vw,33px)}
h3{font-size:clamp(18px,2vw,21px)}
h4{font-size:16px}
p{max-width:none}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--lava);color:#140600}

.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}
.u-mono{font-family:var(--ff-mono);font-variant-numeric:tabular-nums}
.u-muted{color:var(--violet)}
.u-accent{color:var(--cyan)}
.u-lava{color:var(--lava)}

.skip-link{
  position:fixed;left:12px;top:-72px;z-index:200;
  padding:10px 18px;background:var(--cyan);color:var(--ink);
  font-family:var(--ff-mono);font-size:13px;letter-spacing:.08em;
  border-radius:0 0 14px 4px;transition:top .22s var(--ease);
}
.skip-link:focus{top:0}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.container--narrow{max-width:780px}

.section{position:relative;padding:56px 0;border-top:1px solid var(--line)}
.section:first-of-type{border-top:0}
.section--paper{background:var(--paper);color:var(--ink);border-top-color:transparent}
.section--paper .section__lead{color:var(--ink-muted)}
.section--paper .section__eyebrow{color:var(--ink-teal)}
.section--paper .u-muted{color:var(--ink-muted)}

.section__eyebrow{
  display:inline-block;margin-bottom:14px;
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.28em;
  text-transform:uppercase;color:var(--cyan);
}
.section__title{max-width:34ch}
.section__lead{margin-top:16px;max-width:62ch;color:var(--steel);font-size:16px}
.prose{max-width:68ch}
.prose p{margin-bottom:1.05em}
.prose h3{margin:1.8em 0 .6em}
.prose ul{margin:0 0 1.1em;display:flex;flex-direction:column;gap:8px}
.prose li{padding-left:16px;position:relative}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:7px;height:1px;background:var(--cyan)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
[class*="span-"]{grid-column:1 / -1;min-width:0}
@media (min-width:768px){
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 6}
}
@media (min-width:1024px){
  .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-12{grid-column:1 / -1}
}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border:1px solid var(--line-strong);
  font-family:var(--ff-head);font-size:14px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--paper);border-radius:18px 4px 18px 4px;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--accent{background:var(--lava);border-color:var(--lava);color:#140600}
.btn--accent:hover{background:var(--cyan);border-color:var(--cyan)}
.btn--ghost{border-color:rgba(95,227,207,.6);color:var(--cyan)}
.btn--ghost:hover{background:rgba(95,227,207,.1)}
.btn--quiet{border-color:transparent;color:var(--violet);padding-left:0;padding-right:0}
.btn--quiet:hover{color:var(--white)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--ff-mono);font-size:12px;letter-spacing:.08em;color:var(--violet);
}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item::after{content:"/";color:var(--violet-deep)}
.breadcrumbs__item:last-child::after{display:none}
.breadcrumbs a:hover{color:var(--cyan)}

.stat{display:flex;flex-direction:column;gap:6px;padding:18px 0;border-top:1px solid var(--line)}
.stat__value{
  font-family:var(--ff-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(28px,4vw,44px);line-height:1;color:var(--white);letter-spacing:-.01em;
}
.stat__value--accent{color:var(--lava)}
.stat__label{font-size:13px;letter-spacing:.1em;color:var(--violet)}
.stat--hero .stat__value{font-size:clamp(46px,9vw,88px)}
.section--paper .stat{border-top-color:rgba(7,18,31,.14)}
.section--paper .stat__value{color:var(--ink)}
.section--paper .stat__label{color:var(--ink-muted)}

.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border:1px solid var(--line);border-radius:999px;
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.08em;color:var(--steel);
}
.tag--cyan{border-color:rgba(95,227,207,.5);color:var(--cyan)}
.tag--lava{border-color:rgba(255,92,41,.5);color:var(--lava)}

.panel{position:relative;background:rgba(18,58,90,.3);border:1px solid var(--line);padding:24px}
.panel--plain{background:transparent}
.panel--paper{background:var(--paper);color:var(--ink);border-color:transparent}
.panel--paper .section__lead,.panel--paper .u-muted{color:var(--ink-muted)}
.panel--paper a{color:var(--ink-teal);text-decoration:underline;text-underline-offset:3px}
.panel--paper a:hover{color:var(--lava)}

.media-frame{
  position:relative;overflow:hidden;
  background:linear-gradient(160deg,var(--deep-mid) 0%,var(--deep) 58%,var(--ink) 100%);
  border:1px solid var(--line);
}
.media-frame::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:
    linear-gradient(rgba(201,214,228,.09) 1px,transparent 1px),
    linear-gradient(90deg,rgba(201,214,228,.09) 1px,transparent 1px);
  background-size:32px 32px;
}
.media-frame::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;z-index:2;
  background:linear-gradient(90deg,var(--cyan),rgba(95,227,207,0) 78%);
}
.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--panorama{aspect-ratio:21 / 9}
.media-frame--organic{border-radius:32px 6px 32px 6px}
.media-frame__caption{
  position:absolute;left:14px;bottom:12px;z-index:3;
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.1em;color:var(--steel);
  background:rgba(7,18,31,.72);padding:3px 8px;border-radius:10px 3px 10px 3px;
}

.collapse{border-top:1px solid var(--line)}
.collapse__item{border-bottom:1px solid var(--line)}
.collapse__trigger{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 0;text-align:left;color:var(--paper);
  font-family:var(--ff-head);font-size:16px;letter-spacing:.06em;
  transition:color .25s var(--ease);
}
.collapse__trigger:hover{color:var(--cyan)}
.collapse__sign{font-family:var(--ff-mono);font-size:18px;color:var(--cyan);transition:transform .25s var(--ease)}
.collapse__trigger[aria-expanded="true"] .collapse__sign{transform:rotate(45deg)}
.collapse__panel{padding:0 0 20px;color:var(--steel)}

.has-js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ============ header ============ */
.site-header{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:60;
  display:flex;flex-direction:column;align-items:stretch;
  background:linear-gradient(180deg,#07121F 0%,#0A1B2E 100%);
  border-right:1px solid var(--line);
}
.site-header::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;z-index:2;
  background:linear-gradient(90deg,var(--cyan),var(--lava));
}
.rail-head{
  flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:18px;
  padding:22px 8px 14px;border-bottom:1px solid var(--line);
}
.brand{display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center}
.brand__mark{
  display:grid;place-items:center;width:44px;height:44px;flex:0 0 auto;
  background:var(--cyan);color:var(--ink);
  font-family:var(--ff-mono);font-weight:700;font-size:14px;letter-spacing:.02em;
  border-radius:14px 4px 14px 4px;
}
.brand__text{display:flex;flex-direction:column;align-items:center;gap:8px;min-width:0}
.brand__name{
  writing-mode:vertical-rl;text-orientation:upright;
  font-family:var(--ff-head);font-weight:700;font-size:12px;letter-spacing:.16em;
  color:var(--white);line-height:1;
}
.brand__tag{display:none}

.nav-toggle{display:none}

.nav-scrim{display:none}

.site-nav{
  flex:1 1 auto;display:flex;flex-direction:column;align-items:center;gap:4px;
  padding:14px 6px 14px;overflow-y:auto;overflow-x:hidden;
  scrollbar-width:none;
}
.site-nav::-webkit-scrollbar{display:none}
.site-nav__list{display:flex;flex-direction:column;align-items:center;gap:4px;width:100%}
.site-nav__item{display:flex;justify-content:center;width:100%}
.site-nav__link{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:6px;
  padding:9px 6px;width:100%;border-radius:12px 4px 12px 4px;
  color:var(--steel);
  transition:color .25s var(--ease),background .25s var(--ease);
}
.site-nav__idx{font-family:var(--ff-mono);font-size:10px;letter-spacing:.06em;color:var(--violet-deep);transition:color .25s var(--ease)}
.site-nav__label{
  writing-mode:vertical-rl;text-orientation:upright;
  font-family:var(--ff-head);font-weight:700;font-size:12px;letter-spacing:.16em;line-height:1;
}
.site-nav__link:hover{color:var(--white);background:rgba(95,227,207,.08)}
.site-nav__link:hover .site-nav__idx{color:var(--cyan)}
.site-nav__link[aria-current="page"]{color:var(--cyan);background:rgba(95,227,207,.1)}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--lava)}
.site-nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:-6px;top:10px;bottom:10px;width:2px;
  background:var(--cyan);border-radius:2px;
}
.site-nav__chapter{
  display:block;margin:16px 0 12px;padding:10px 4px;
  writing-mode:vertical-rl;text-orientation:upright;
  max-height:140px;overflow:hidden;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  font-family:var(--ff-mono);font-size:10px;letter-spacing:.14em;color:var(--lava);
}
.site-nav__chapter-key{color:var(--violet)}
.site-nav__cta{
  display:block;margin-top:auto;padding:18px 8px;flex:0 0 auto;
  writing-mode:vertical-rl;text-orientation:upright;text-align:center;
  background:var(--lava);color:#140600;
  font-family:var(--ff-head);font-weight:700;font-size:12px;letter-spacing:.24em;
  border-radius:16px 4px 16px 4px;
  transition:background .25s var(--ease),transform .25s var(--ease);
}
.site-nav__cta:hover{background:var(--cyan);transform:translateY(-2px)}
.scroll-meter{position:relative;flex:0 0 auto;height:3px;background:rgba(201,214,228,.14)}
.scroll-meter__fill{position:absolute;left:0;top:0;height:100%;width:0;background:var(--lava);transition:width .12s linear}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}

/* ============ mobile / tablet header ============ */
@media (max-width:1023px){
  html{scroll-padding-top:76px}
  body.is-nav-open{overflow:hidden}
  .site-header{
    position:sticky;top:0;left:auto;bottom:auto;
    width:100%;height:var(--topbar-h);
    flex-direction:row;align-items:center;justify-content:space-between;
    padding:0 14px;background:rgba(7,18,31,.97);
    border-right:0;border-bottom:1px solid var(--line);
  }
  .rail-head{
    flex:1 1 auto;flex-direction:row;align-items:center;justify-content:space-between;
    gap:12px;padding:0;border-bottom:0;min-width:0;
  }
  .brand{flex-direction:row;align-items:center;gap:10px;text-align:left;min-width:0}
  .brand__mark{width:36px;height:36px;font-size:12px;border-radius:12px 4px 12px 4px}
  .brand__text{align-items:flex-start;gap:3px;min-width:0}
  .brand__name{
    writing-mode:horizontal-tb;
    font-size:14px;letter-spacing:.08em;line-height:1.2;
    white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  }
  .brand__tag{
    display:block;font-family:var(--ff-mono);font-size:10px;letter-spacing:.06em;
    color:var(--violet);line-height:1.3;
    white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:46vw;
  }
  .nav-toggle{
    display:inline-flex;align-items:center;gap:9px;flex:0 0 auto;
    padding:8px 11px;border:1px solid var(--line-strong);
    border-radius:14px 4px 14px 4px;color:var(--steel);
    font-family:var(--ff-mono);font-size:11px;letter-spacing:.14em;
    transition:color .25s var(--ease),border-color .25s var(--ease);
  }
  .nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:18px}
  .nav-toggle__bars i{display:block;height:1.5px;background:currentColor;transition:transform .25s var(--ease),opacity .2s linear}
  .nav-toggle[aria-expanded="true"]{color:var(--cyan);border-color:rgba(95,227,207,.6)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}

  .nav-scrim{
    display:block;position:absolute;top:100%;left:0;right:0;
    height:calc(100vh - var(--topbar-h));
    background:rgba(5,13,23,.66);
    opacity:0;pointer-events:none;transition:opacity .3s var(--ease);
  }
  .site-header[data-open] .nav-scrim{opacity:1;pointer-events:auto}

  .site-nav{
    position:absolute;top:100%;left:0;bottom:auto;
    width:min(320px,86vw);height:calc(100vh - var(--topbar-h));
    display:flex;flex-direction:column;align-items:stretch;gap:4px;
    padding:18px 16px 28px;overflow-y:auto;
    background:#07121F;border-right:1px solid var(--line);
    transform:translateX(-104%);
    transition:transform .32s var(--ease);
    scrollbar-width:none;
  }
  .site-nav::-webkit-scrollbar{display:none}
  .site-header[data-open] .site-nav{transform:translateX(0)}
  .site-nav__list{align-items:stretch;gap:2px}
  .site-nav__item{justify-content:flex-start}
  .site-nav__link{
    flex-direction:row;align-items:center;gap:14px;width:100%;
    padding:13px 12px;border-radius:12px 4px 12px 4px;
    border-left:2px solid transparent;
  }
  .site-nav__label{writing-mode:horizontal-tb;font-size:15px;letter-spacing:.08em}
  .site-nav__idx{font-size:11px}
  .site-nav__link[aria-current="page"]{border-left-color:var(--cyan)}
  .site-nav__link[aria-current="page"]::before{display:none}
  .site-nav__chapter{
    writing-mode:horizontal-tb;display:flex;flex-direction:row;align-items:center;gap:10px;
    margin:16px 0 6px;padding:10px 12px;max-height:none;overflow:visible;
    border:0;border-radius:12px 4px 12px 4px;background:rgba(255,92,41,.1);font-size:11px;
  }
  .site-nav__chapter-key{color:var(--violet)}
  .site-nav__cta{
    writing-mode:horizontal-tb;margin-top:16px;padding:14px;text-align:center;
    letter-spacing:.2em;
  }
  .scroll-meter{position:absolute;left:0;right:0;bottom:0;height:2px}
}

/* ============ footer ============ */
.site-footer{
  position:relative;z-index:1;
  background:#050D17;border-top:1px solid var(--line);
  color:var(--steel);padding-top:56px;
}
.footer__top{
  display:grid;grid-template-columns:1fr;gap:40px;padding-bottom:48px;
}
@media (min-width:768px){.footer__top{grid-template-columns:1fr;gap:36px}}
@media (min-width:1024px){.footer__top{grid-template-columns:1.25fr 2fr;gap:56px;align-items:start}}

.footer__brand{min-width:0}
.footer__mark{
  display:inline-grid;place-items:center;width:52px;height:52px;
  background:var(--cyan);color:var(--ink);
  font-family:var(--ff-mono);font-weight:700;font-size:16px;
  border-radius:18px 5px 18px 5px;
}
.footer__name{
  margin-top:16px;font-family:var(--ff-head);font-weight:700;
  font-size:18px;letter-spacing:.1em;color:var(--white);
}
.footer__intro{margin-top:12px;font-size:14px;line-height:1.9;color:var(--violet);max-width:48ch}

.footer__grid{display:grid;grid-template-columns:1fr;gap:28px}
@media (min-width:520px){.footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.footer__grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}}
.footer__col{min-width:0}
.footer__title{
  font-family:var(--ff-head);font-weight:700;font-size:13px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);
}
.footer__links{margin-top:16px;display:flex;flex-direction:column;gap:11px}
.footer__links a{
  position:relative;display:inline-block;padding-left:15px;
  font-size:14px;color:var(--steel);
  transition:color .25s var(--ease);
}
.footer__links a::before{
  content:"";position:absolute;left:0;top:.78em;width:6px;height:1px;
  background:var(--violet-deep);transition:width .25s var(--ease),background .25s var(--ease);
}
.footer__links a:hover{color:var(--white)}
.footer__links a:hover::before{width:11px;background:var(--lava)}

.footer__contact{margin-top:16px;display:flex;flex-direction:column;gap:15px}
.footer__contact-item{display:flex;flex-direction:column;gap:3px;min-width:0}
.footer__contact-key{
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.18em;color:var(--violet);
}
.footer__contact-value{
  font-family:var(--ff-mono);font-size:13px;letter-spacing:.02em;
  color:var(--steel);word-break:break-all;line-height:1.6;
}
.footer__copy{
  display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap;
  align-self:flex-start;margin-left:-10px;padding:6px 10px;
  color:var(--steel);text-align:left;
  border:1px solid transparent;border-radius:14px 4px 14px 4px;
  transition:color .25s var(--ease),border-color .25s var(--ease),background .25s var(--ease);
}
.footer__copy:hover{color:var(--cyan);border-color:rgba(95,227,207,.4);background:rgba(95,227,207,.06)}
.footer__copy-hint{
  font-family:var(--ff-mono);font-size:10px;letter-spacing:.12em;color:var(--lava);
  border:1px solid rgba(255,92,41,.4);border-radius:999px;padding:1px 7px;white-space:nowrap;
}

.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 26px;
  padding:20px 0 30px;border-top:1px solid var(--line);
  font-family:var(--ff-mono);font-size:12px;letter-spacing:.06em;color:var(--violet);
}
.footer__legal{color:var(--violet)}
.footer__copyright{color:var(--steel)}

.to-top{
  position:fixed;right:18px;bottom:18px;z-index:55;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;border:1px solid var(--line-strong);
  background:rgba(10,27,46,.92);color:var(--paper);
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.14em;
  border-radius:14px 4px 14px 4px;
  opacity:0;transform:translateY(10px);pointer-events:none;
  transition:opacity .3s var(--ease),transform .3s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.to-top.is-visible{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{color:var(--cyan);border-color:rgba(95,227,207,.6)}
.to-top__mark{color:var(--lava);font-size:13px}
.to-top__label{white-space:nowrap}

@media (min-width:1024px){
  .site-footer{padding-top:72px}
  .footer__bottom{padding-bottom:34px}
}

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