*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

:root{
  --deep:#071A2B;
  --deep-press:#04101B;
  --night:#0E2A47;
  --cyan:#00E0B8;
  --cyan-dim:#0B7F72;
  --coral:#FF6B4A;
  --yellow:#FFD166;
  --cream:#F6F0E6;
  --ink:#1A1310;
  --mist:#8FA6BD;
  --muted:#6F8399;
  --mint:#D9F7F0;
  --clay:#C44B36;

  --font-body:'Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  --font-display:'Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','Roboto Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shell:1240px;
  --gutter:clamp(18px,4vw,44px);
  --section-y:clamp(60px,8vw,124px);
  --radius:14px;
  --cut:22px;
  --ease:cubic-bezier(.22,.8,.28,1);
  --shadow-lift:0 26px 60px -32px rgba(0,0,0,.9);
}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  font-weight:400;
  color:var(--cream);
  background-color:var(--deep);
  background-image:
    radial-gradient(1100px 560px at 82% -10%, rgba(0,224,184,.15), transparent 62%),
    radial-gradient(820px 480px at 2% 6%, rgba(255,107,74,.09), transparent 60%);
  background-repeat:no-repeat;
  letter-spacing:.01em;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.24;letter-spacing:-.02em;color:var(--cream)}
h2{font-size:clamp(1.5rem,3vw,2.1rem)}
h3{font-size:clamp(1.1rem,2vw,1.36rem)}
p{text-wrap:pretty}

:focus-visible{outline:2px solid var(--yellow);outline-offset:3px;border-radius:4px}

.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.mono{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;font-weight:500}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}

.skip-link{
  position:absolute;left:12px;top:-70px;z-index:300;
  display:inline-block;padding:10px 20px;
  background:var(--cyan);color:var(--deep);
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;
  border-radius:0 0 10px 10px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--deep)}

.brandbar{background:var(--deep-press);border-bottom:1px solid rgba(0,224,184,.18)}
.brandbar__inner{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  min-height:38px;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--mist);
}
.brandbar__mark{display:flex;align-items:center;gap:10px;min-width:0}
.brandbar__name{color:var(--cyan);font-weight:600;letter-spacing:.2em;white-space:nowrap}
.brandbar__dot{width:14px;height:1px;background:rgba(143,166,189,.5);flex:none}
.brandbar__motto{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brandbar__status{display:flex;align-items:center;gap:9px;white-space:nowrap}
.brandbar__pulse{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);flex:none;
  box-shadow:0 0 0 0 rgba(0,224,184,.55);
  animation:brand-pulse 2.6s var(--ease) infinite;
}
@keyframes brand-pulse{
  0%{box-shadow:0 0 0 0 rgba(0,224,184,.55)}
  70%{box-shadow:0 0 0 9px rgba(0,224,184,0)}
  100%{box-shadow:0 0 0 0 rgba(0,224,184,0)}
}
.brandbar__state{color:var(--yellow)}
.brandbar__sep{color:rgba(143,166,189,.45)}
.brandbar__phase{color:var(--muted)}

.navbar{
  background:linear-gradient(180deg,rgba(14,42,71,.96),rgba(7,26,43,.99));
  border-bottom:1px solid rgba(143,166,189,.22);
  backdrop-filter:blur(10px);
}
.navbar__inner{display:flex;align-items:center;gap:clamp(16px,3vw,40px);min-height:72px}

.brand{display:flex;align-items:center;gap:12px;flex:none}
.brand__glyph{
  display:grid;place-items:center;width:38px;height:38px;flex:none;
  background:var(--cyan);color:var(--deep);
  font-weight:900;font-size:1.05rem;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{font-size:1.06rem;font-weight:900;letter-spacing:.05em;color:var(--cream)}
.brand__sub{
  font-family:var(--font-mono);font-size:.58rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--muted);
}

.nav{display:flex;align-items:center;gap:clamp(14px,2.4vw,32px);margin-left:auto}
.nav__list{display:flex;align-items:center;gap:clamp(2px,1vw,10px)}
.nav__item{position:relative}
.nav__link{
  position:relative;
  display:flex;align-items:baseline;gap:7px;
  padding:9px 10px;border-radius:8px;
  font-size:.92rem;font-weight:500;color:var(--mist);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav__idx{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.1em;color:var(--cyan-dim);transition:color .2s var(--ease)}
.nav__link::after{
  content:"";position:absolute;left:10px;right:10px;bottom:2px;height:2px;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--coral));
  transition:width .25s var(--ease);
}
.nav__link:hover{color:var(--cream);background:rgba(0,224,184,.08)}
.nav__link:hover .nav__idx{color:var(--cyan)}
.nav__link[aria-current="page"]{color:var(--cream)}
.nav__link[aria-current="page"] .nav__idx{color:var(--yellow)}
.nav__link[aria-current="page"]::after{width:calc(100% - 20px)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;
  font-size:.86rem;font-weight:700;letter-spacing:.06em;
  border:1px solid transparent;border-radius:999px;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .16s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--coral);color:var(--deep-press)}
.btn--primary:hover{background:#ff8368}
.btn--ghost{border-color:rgba(0,224,184,.5);color:var(--cyan)}
.btn--ghost:hover{background:rgba(0,224,184,.14);color:var(--mint)}
.nav__cta{flex:none;padding:9px 18px;font-size:.79rem}

.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:9px 14px;
  border:1px solid rgba(143,166,189,.35);border-radius:10px;
  color:var(--cream);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:rgba(0,224,184,.6);background:rgba(0,224,184,.08)}
.nav-toggle__bars{display:flex;flex-direction:column;justify-content:center;gap:4px;width:18px}
.nav-toggle__bars i{display:block;height:2px;background:var(--cyan);border-radius:2px;transition:transform .25s var(--ease),opacity .2s var(--ease)}
.nav-toggle__bars i:nth-child(2){width:72%}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}
.nav-toggle__label{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(143,166,189,.14);overflow:hidden;
}
.scroll-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--yellow),var(--coral));
  transition:width .1s linear;
}

/* ---------- layout ---------- */
.section{padding-block:var(--section-y)}
.section--tight{padding-block:clamp(34px,5vw,70px)}
.section--night{background:var(--night)}
.section--paper{background:var(--cream);color:var(--ink)}
.section--paper h1,.section--paper h2,.section--paper h3{color:var(--ink)}
.section--paper .section-head__title{color:var(--ink)}
.section--paper .section-head__desc{color:#4A4038}

.grid{display:grid;gap:clamp(16px,2.4vw,30px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr)}

.panel{
  position:relative;
  background:linear-gradient(160deg,rgba(14,42,71,.92),rgba(7,26,43,.97));
  border:1px solid rgba(143,166,189,.22);
  border-radius:var(--radius);
  padding:clamp(20px,3vw,32px);
  box-shadow:var(--shadow-lift);
}
.panel--cut{
  border-radius:0;
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.panel--paper{background:var(--cream);color:var(--ink);border-color:rgba(26,19,16,.14)}
.panel--mint{background:var(--mint);color:var(--ink);border-color:rgba(26,19,16,.12)}

.tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 13px;
  font-family:var(--font-mono);font-size:.65rem;letter-spacing:.16em;text-transform:uppercase;
  border:1px solid rgba(0,224,184,.45);color:var(--cyan);border-radius:999px;
}
.tag--coral{border-color:rgba(255,107,74,.5);color:var(--coral)}
.tag--yellow{border-color:rgba(255,209,102,.5);color:var(--yellow)}
.tag--ink{border-color:rgba(26,19,16,.3);color:var(--ink)}

.section-head{display:flex;flex-direction:column;gap:12px;margin-bottom:clamp(24px,3vw,42px)}
.section-head__eyebrow{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.24em;text-transform:uppercase;
  color:var(--cyan);
}
.section-head__title{font-size:clamp(1.85rem,4.4vw,2.9rem);font-weight:900;letter-spacing:-.025em;color:var(--cream)}
.section-head__desc{max-width:62ch;color:var(--mist);font-size:.98rem;line-height:1.85}

.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(1.6rem,3.4vw,2.4rem);line-height:1;letter-spacing:-.02em;
  color:var(--yellow);
}
.stat__label{
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--mist);
}

.index-list{display:flex;flex-direction:column;border-top:1px solid rgba(143,166,189,.24)}
.index-list__item{
  display:flex;align-items:baseline;gap:16px;
  padding:15px 4px;border-bottom:1px solid rgba(143,166,189,.16);
  transition:background .2s var(--ease),padding-left .2s var(--ease);
}
.index-list__item:hover{background:rgba(0,224,184,.07);padding-left:14px}
.index-list__num{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--cyan);flex:none;min-width:2.4em}
.index-list__label{font-weight:600;color:var(--cream)}
.index-list__meta{margin-left:auto;font-size:.82rem;color:var(--mist);text-align:right}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:.67rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--mist);
}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(143,166,189,.5)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--yellow)}

.prose{max-width:64ch;font-size:1.0625rem;line-height:1.95;color:rgba(246,240,230,.87)}
.prose > * + *{margin-top:1.15em}
.prose h2{font-size:clamp(1.36rem,3vw,1.85rem);margin-top:2.1em;color:var(--cream)}
.prose h3{font-size:1.14rem;margin-top:1.7em;color:var(--mint)}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(0,224,184,.4)}
.prose a:hover{color:var(--yellow);border-bottom-color:var(--yellow)}
.prose ul{padding-left:0}
.prose li{position:relative;padding-left:22px}
.prose li + li{margin-top:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:9px;height:2px;background:var(--coral)}
.prose blockquote{border-left:3px solid var(--cyan);padding-left:18px;color:var(--mist)}
.prose code{
  font-family:var(--font-mono);font-size:.86em;
  background:rgba(0,224,184,.13);color:var(--mint);
  padding:2px 7px;border-radius:5px;
}
.section--paper .prose,.panel--paper .prose,.panel--mint .prose{color:rgba(26,19,16,.86)}
.section--paper .prose h2,.section--paper .prose h3,
.panel--paper .prose h2,.panel--paper .prose h3,
.panel--mint .prose h2,.panel--mint .prose h3{color:var(--ink)}
.section--paper .prose li::before,.panel--paper .prose li::before{background:var(--clay)}

.media-frame{
  position:relative;display:block;overflow:hidden;isolation:isolate;
  background:
    repeating-linear-gradient(112deg,rgba(0,224,184,.12) 0 1px,transparent 1px 22px),
    linear-gradient(140deg,rgba(14,42,71,.96),rgba(4,16,27,.99) 62%);
  clip-path:polygon(0 0,calc(100% - 26px) 0,100% 26px,100% 100%,26px 100%,0 calc(100% - 26px));
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,transparent 50%,rgba(4,16,27,.7));
}
.media-frame > img,.media-frame > video{display:block;width:100%;height:100%;object-fit:cover}
.media-frame > picture{display:block;width:100%;height:100%}
.media-frame > picture > img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--hero{aspect-ratio:21/9}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  background:linear-gradient(180deg,var(--deep) 0%,var(--deep-press) 100%);
  border-top:1px solid rgba(0,224,184,.25);
  color:var(--mist);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:min(340px,62vw);height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--yellow),transparent);
}
.footer__grid{
  display:grid;
  grid-template-columns:minmax(250px,1.5fr) repeat(2,minmax(140px,1fr)) minmax(230px,1.3fr);
  gap:clamp(26px,4vw,54px);
  padding-block:clamp(46px,6vw,84px);
}
.footer__col{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer__col--brand{max-width:38ch}
.footer__logo{font-size:1.34rem;font-weight:900;letter-spacing:.05em;color:var(--cream)}
.footer__lede{font-size:.92rem;line-height:1.85;color:var(--mist)}
.footer__badge{
  align-self:flex-start;
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.18em;text-transform:uppercase;
  padding:5px 12px;color:var(--cyan);border:1px solid rgba(0,224,184,.4);border-radius:999px;
}
.footer__title{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--cyan);font-weight:600;
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{
  position:relative;display:inline-block;width:fit-content;
  font-size:.92rem;color:var(--mist);
  transition:color .2s var(--ease);
}
.footer__link::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:1px;
  background:var(--cyan);transition:width .25s var(--ease);
}
.footer__link:hover{color:var(--cream)}
.footer__link:hover::after{width:100%}
.footer__meta{display:flex;flex-direction:column;gap:10px;font-size:.9rem;line-height:1.7;color:var(--mist)}
.footer__key{
  display:inline-block;min-width:3.2em;
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--yellow);
}
.footer__note{font-size:.8rem;line-height:1.75;color:var(--muted)}
.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 26px;
  padding-block:22px;
  border-top:1px solid rgba(143,166,189,.2);
}
.footer__copy{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--muted)}
.footer__legal{display:flex;flex-wrap:wrap;align-items:center;gap:10px 20px;font-size:.8rem}
.footer__icp{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;
  color:var(--muted);padding:4px 10px;border:1px solid rgba(143,166,189,.28);border-radius:6px;
}

.to-top{
  position:fixed;right:clamp(16px,3vw,34px);bottom:clamp(16px,3vw,34px);z-index:70;
  display:grid;place-items:center;width:50px;height:50px;
  background:rgba(14,42,71,.94);color:var(--cyan);
  border:1px solid rgba(0,224,184,.45);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s,background .2s var(--ease),color .2s var(--ease);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--cyan);color:var(--deep-press)}
.to-top__arrow{font-size:1.05rem;line-height:1;font-family:var(--font-mono)}

/* ---------- reveal ---------- */
.js-ready [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .footer__grid{grid-template-columns:minmax(220px,1.4fr) repeat(2,minmax(140px,1fr))}
  .footer__col:last-child{grid-column:1 / -1}
}
@media (max-width:960px){
  .brandbar__inner{min-height:34px;font-size:.63rem;letter-spacing:.12em}
  .brandbar__motto{display:none}
  .brandbar__phase,.brandbar__sep{display:none}
  .navbar__inner{min-height:62px}
  .nav-toggle{display:inline-flex}
  .nav{
    position:fixed;top:0;left:0;right:0;z-index:2;
    margin:0;flex-direction:column;align-items:stretch;gap:18px;
    padding:calc(96px + env(safe-area-inset-top,0px)) var(--gutter) 34px;
    background:
      repeating-linear-gradient(112deg,rgba(0,224,184,.07) 0 1px,transparent 1px 26px),
      linear-gradient(180deg,rgba(4,16,27,.98),rgba(7,26,43,.99));
    border-bottom:1px solid rgba(0,224,184,.35);
    box-shadow:0 32px 70px -28px rgba(0,0,0,.92);
    transform:translateY(-102%);visibility:hidden;opacity:0;
    transition:transform .38s var(--ease),opacity .3s var(--ease),visibility .38s;
  }
  .nav[data-open]{transform:translateY(0);visibility:visible;opacity:1}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px dashed rgba(143,166,189,.2)}
  .nav__link{padding:16px 4px;font-size:1.04rem;justify-content:flex-start}
  .nav__link::after{left:0;right:auto;bottom:8px}
  .nav__link[aria-current="page"]::after{width:26px}
  .nav__idx{min-width:30px}
  .nav__cta{width:100%;padding:14px 20px}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:760px){
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__col--brand{grid-column:span 2}
  .footer__col:last-child{grid-column:span 2}
}
@media (max-width:620px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .index-list__meta{margin-left:0;flex-basis:100%;text-align:left}
  .index-list__item{flex-wrap:wrap}
}
@media (max-width:520px){
  .footer__grid{grid-template-columns:1fr}
  .footer__col--brand,.footer__col:last-child{grid-column:auto}
  .footer__bottom{flex-direction:column;align-items:flex-start}
}

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