:root{
  --ink:#07111F;
  --ink-deep:#0B1B30;
  --trench:#12304F;
  --slate:#52677D;
  --mist:#C9D6E4;
  --paper:#F2F6FA;
  --orange:#FF6B35;
  --orange-soft:#FF8355;
  --cyan:#35F0D0;
  --amber:#FFC857;
  --glass:rgba(242,246,250,.08);
  --glass-strong:rgba(242,246,250,.14);
  --line:rgba(201,214,228,.14);
  --line-strong:rgba(201,214,228,.30);
  --shadow:0 26px 64px -34px rgba(0,0,0,.9);
  --font-display:"Noto Sans SC Condensed","Barlow Condensed","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --container:1240px;
  --gutter:clamp(18px,4vw,48px);
  --radius:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --header-h:76px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:var(--ink)}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul[class],ol[class]{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--mist);text-decoration-color:rgba(201,214,228,.35);text-underline-offset:3px;transition:color .2s var(--ease)}
a:hover{color:var(--cyan)}
::selection{background:rgba(53,240,208,.28);color:var(--paper)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

body{
  position:relative;
  min-height:100vh;
  background:var(--ink);
  color:var(--mist);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
body::before{
  content:"";
  position:fixed;
  inset:0 0 auto 0;
  height:70vh;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(60% 70% at 12% 0%, rgba(53,240,208,.075), transparent 70%),
    radial-gradient(55% 65% at 88% 4%, rgba(255,107,53,.06), transparent 72%);
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.18;
  letter-spacing:.01em;
  color:var(--paper);
}
h1{font-size:clamp(2.2rem,5.4vw,4.2rem)}
h2{font-size:clamp(1.5rem,2.8vw,2.1rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.35rem)}
h4{font-size:1.02rem;letter-spacing:.04em}

#main-content{position:relative;z-index:1;display:block;padding-bottom:clamp(40px,6vw,80px)}

.container{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.measure{max-width:62ch}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}

.grid{display:grid;gap:clamp(18px,3vw,40px)}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}
.grid--3-9{grid-template-columns:minmax(0,3fr) minmax(0,9fr)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}

.chapter{
  display:flex;
  align-items:center;
  gap:12px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:rgba(201,214,228,.55);
}
.chapter__index{color:var(--cyan);letter-spacing:.1em}
.chapter::after{
  content:"";
  flex:1 1 auto;
  min-width:24px;
  height:1px;
  background:linear-gradient(90deg,var(--line-strong),transparent);
}
.rule{height:1px;border:0;margin:0;background:var(--line)}

.btn{
  --btn-bg:transparent;
  --btn-fg:var(--paper);
  display:inline-flex;
  align-items:center;
  gap:.6em;
  padding:.72em 1.15em;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-family:var(--font-body);
  font-size:.94rem;
  font-weight:600;
  line-height:1.2;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn::after{content:"→";font-family:var(--font-mono);font-size:.9em;line-height:1;transform:translateY(-1px)}
.btn--primary{--btn-bg:var(--orange);--btn-fg:#08182A;border-color:transparent;box-shadow:0 10px 26px -18px rgba(255,107,53,.9)}
.btn--primary:hover{--btn-bg:var(--orange-soft);color:#08182A}
.btn--ghost{--btn-fg:var(--mist);border-color:var(--line-strong);background:rgba(242,246,250,.04)}
.btn--ghost:hover{--btn-fg:var(--paper);border-color:var(--cyan);color:var(--paper)}

.skip-link{
  position:absolute;
  left:var(--gutter);
  top:0;
  z-index:120;
  transform:translateY(-160%);
  padding:.62em 1.05em;
  border-radius:0 0 10px 10px;
  background:var(--cyan);
  color:#06202A;
  font-weight:700;
  font-size:.9rem;
  text-decoration:none;
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);color:#06202A;outline-offset:2px}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(7,17,31,.86);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(18px) saturate(150%);
  backdrop-filter:blur(18px) saturate(150%);
}
.site-header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(16px,3vw,40px);
  min-height:var(--header-h);
  padding-block:12px;
}

.brand{display:flex;flex-direction:column;min-width:0}
.brand__link{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--paper);
}
.brand__link:hover{color:var(--cyan)}
.brand__mark{
  display:inline-grid;
  place-items:center;
  flex:0 0 auto;
  width:38px;
  height:38px;
  border-radius:11px;
  border:1px solid rgba(53,240,208,.35);
  background:linear-gradient(160deg,var(--trench),rgba(53,240,208,.16));
  font-family:var(--font-mono);
  font-size:.88rem;
  font-weight:600;
  letter-spacing:.02em;
  color:var(--cyan);
}
.brand__name{
  font-family:var(--font-display);
  font-size:clamp(1.05rem,1.6vw,1.28rem);
  font-weight:800;
  letter-spacing:.04em;
  line-height:1.2;
  white-space:nowrap;
}
.brand__meta{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:6px 12px;
  margin-top:6px;
  padding-left:50px;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.12em;
  line-height:1.5;
  color:rgba(201,214,228,.5);
}
.brand__status{display:inline-flex;align-items:center;gap:6px;color:var(--cyan)}
.brand__dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,240,208,.16);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:rgba(242,246,250,.04);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle__label{white-space:nowrap}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{
  display:block;
  height:1.5px;
  border-radius:2px;
  background:var(--cyan);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}

.site-nav{display:flex;align-items:center;gap:clamp(14px,2vw,28px)}
.site-nav__list{display:flex;align-items:center;gap:clamp(10px,1.6vw,22px)}
.site-nav__link{
  position:relative;
  display:inline-block;
  padding:8px 2px;
  color:var(--mist);
  font-size:.92rem;
  font-weight:500;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  transition:color .2s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:2px;
  background:var(--cyan);
  transition:width .22s var(--ease);
}
.site-nav__link:hover{color:var(--paper)}
.site-nav__link:hover::after{width:100%}
.site-nav__link[aria-current="page"]{color:var(--paper)}
.site-nav__link[aria-current="page"]::after{width:100%;background:var(--cyan)}
.header-cta{flex:0 0 auto;white-space:nowrap;font-size:.88rem;padding:.6em 1em}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:width .1s linear;
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(56px,9vw,120px);
  background:var(--ink-deep);
  border-top:1px solid var(--line);
}
.site-footer__inner{padding-block:clamp(40px,6vw,72px) 0}
.site-footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(0,.85fr) minmax(0,1.15fr);
  gap:clamp(28px,4vw,64px);
  align-items:start;
}
.footer-nav{padding-top:clamp(0px,1.6vw,22px)}

.footer-brand__link{
  display:inline-block;
  font-family:var(--font-display);
  font-size:clamp(1.15rem,1.8vw,1.4rem);
  font-weight:800;
  letter-spacing:.04em;
  color:var(--paper);
  text-decoration:none;
}
.footer-brand__link:hover{color:var(--cyan)}
.footer-brand__line{
  margin-top:12px;
  max-width:32ch;
  font-size:.94rem;
  line-height:1.7;
  color:var(--slate);
}
.footer-brand__meta{
  margin-top:22px;
  display:grid;
  gap:8px;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.05em;
}
.footer-brand__meta-row{display:flex;gap:12px;align-items:baseline}
.footer-brand__meta-row dt{flex:0 0 auto;color:rgba(201,214,228,.42)}
.footer-brand__meta-row dd{margin:0;color:var(--mist);font-variant-numeric:tabular-nums}

.footer-nav__heading,
.footer-contact__heading{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:rgba(201,214,228,.48);
}
.footer-nav__heading::after,
.footer-contact__heading::after{
  content:"";
  flex:1 1 auto;
  height:1px;
  background:var(--line);
}
.footer-nav__list{display:grid;gap:2px}
.footer-nav__link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:7px 0;
  color:var(--mist);
  font-size:.95rem;
  text-decoration:none;
}
.footer-nav__link::before{
  content:"";
  flex:0 0 auto;
  width:10px;
  height:1px;
  background:rgba(53,240,208,.4);
  transition:width .2s var(--ease),background .2s var(--ease);
}
.footer-nav__link:hover{color:var(--paper)}
.footer-nav__link:hover::before{width:20px;background:var(--cyan)}

.footer-contact__list{display:grid;gap:14px}
.footer-contact__item{
  display:grid;
  gap:3px;
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}
.footer-contact__item:last-child{padding-bottom:0;border-bottom:0}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.16em;
  color:rgba(201,214,228,.45);
}
.footer-contact__value{
  font-size:.98rem;
  color:var(--paper);
  word-break:break-word;
  font-variant-numeric:tabular-nums;
}
.footer-contact__note{
  margin-top:16px;
  padding-left:12px;
  max-width:34ch;
  border-left:2px solid var(--amber);
  font-size:.82rem;
  line-height:1.7;
  color:var(--slate);
}

.site-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-top:clamp(36px,5vw,64px);
  padding-block:22px clamp(24px,3vw,34px);
  border-top:1px solid var(--line);
}
.footer-copyright{
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.08em;
  color:rgba(201,214,228,.5);
  margin:0;
}
.footer-copyright [data-year]{font-variant-numeric:tabular-nums}
.footer-legal__list{display:flex;flex-wrap:wrap;gap:6px 18px}
.footer-legal__link{
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.08em;
  color:rgba(201,214,228,.62);
  text-decoration:none;
}
.footer-legal__link:hover{color:var(--cyan)}

/* ---------- shared blocks ---------- */
.breadcrumb{
  padding-block:18px 0;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:rgba(201,214,228,.5);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(201,214,228,.32)}
.breadcrumb__link{color:rgba(201,214,228,.5);text-decoration:none}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__item[aria-current="page"]{color:var(--mist)}

.prose{max-width:760px;font-size:1.02rem;line-height:1.8;color:var(--mist)}
.prose > * + *{margin-top:1.05em}
.prose p{max-width:66ch}
.prose h2{margin-top:2em;font-size:clamp(1.35rem,2.4vw,1.8rem)}
.prose h3{margin-top:1.6em}
.prose ul,.prose ol{max-width:66ch}
.prose ul > li{position:relative;padding-left:1.4em}
.prose ul > li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:12px;
  height:1px;
  background:var(--cyan);
}
.prose ol{padding-left:1.4em;list-style:decimal}
.prose a{color:var(--paper);text-decoration:underline;text-decoration-color:rgba(53,240,208,.5)}
.prose a:hover{color:var(--cyan)}
.prose strong{color:var(--paper);font-weight:700}

.panel{
  padding:clamp(18px,2.6vw,30px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
}
.panel--solid{
  background:var(--trench);
  border-color:transparent;
  -webkit-backdrop-filter:none;
  backdrop-filter:none;
}
.panel--paper{
  background:var(--paper);
  color:#0A1526;
  border-color:transparent;
  -webkit-backdrop-filter:none;
  backdrop-filter:none;
}
.panel--paper h2,.panel--paper h3,.panel--paper h4{color:#08192C}
.panel--paper a{color:#08192C;text-decoration-color:rgba(18,48,79,.4)}

.media{
  position:relative;
  display:block;
  overflow:hidden;
  margin:0;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(160deg,var(--trench) 0%,var(--ink-deep) 62%,var(--ink) 100%);
  isolation:isolate;
}
.media__frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 10;
  background-image:
    linear-gradient(to right, rgba(201,214,228,.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201,214,228,.07) 1px, transparent 1px);
  background-size:44px 44px;
}
.media__frame > img,
.media__frame > picture > img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center;
}
.media--wide .media__frame{aspect-ratio:21 / 9}
.media--tall .media__frame{aspect-ratio:4 / 5}
.media--square .media__frame{aspect-ratio:1 / 1}
.media--bleed{border-radius:0;border-left:0;border-right:0}
.media--tilt{transform:rotate(-1.1deg)}
.media__caption{
  display:flex;
  gap:10px;
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  line-height:1.6;
  color:rgba(201,214,228,.5);
}
.media__caption::before{content:"FIG";color:var(--cyan)}

/* ---------- reveal protocol ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .35s var(--ease),transform .35s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1020px){
  .nav-toggle{display:inline-flex}
  .brand__meta{padding-left:0}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px var(--gutter) 26px;
    background:rgba(9,21,37,.97);
    border-bottom:1px solid var(--line);
    box-shadow:var(--shadow);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
  }
  .site-header[data-open] .site-nav{display:flex}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{border-top:1px solid var(--line)}
  .site-nav__item:last-child{border-bottom:1px solid var(--line)}
  .site-nav__link{
    display:block;
    padding:14px 0 14px 16px;
    font-size:1rem;
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{color:var(--cyan)}
  .site-nav__link[aria-current="page"]::after{
    display:block;
    left:0;
    top:50%;
    bottom:auto;
    width:6px;
    height:6px;
    border-radius:50%;
    background:var(--cyan);
    transform:translateY(-50%);
  }
  .header-cta{align-self:flex-start;margin-top:18px}

  .grid--7-5,.grid--8-4,.grid--3-9,.grid--2{grid-template-columns:minmax(0,1fr)}
  .site-footer__grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-nav{padding-top:0}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:640px){
  :root{--header-h:66px}
  body{font-size:15.5px}
  .brand__mark{width:34px;height:34px;border-radius:10px;font-size:.8rem}
  .brand__meta{font-size:.6rem;letter-spacing:.08em}
  .nav-toggle__label{display:none}
  .nav-toggle{padding:9px 11px}
  .site-footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer-contact{grid-column:auto}
  .site-footer__base{flex-direction:column;align-items:flex-start;gap:12px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
}