:root{
  --void:#071426;
  --night:#0D2038;
  --slate:#1B3350;
  --gold:#F5C451;
  --violet:#8F6BFF;
  --green:#35D07F;
  --amber:#FF9F43;
  --wine:#5A1733;
  --text:#E8EDF6;
  --dim:#9FB0C8;
  --line:#2A4768;
  --paper:#F7F1E3;
  --shell:1180px;
  --gutter:clamp(16px,4vw,44px);
  --font-display:"Barlow Condensed","Oswald","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{
  margin:0;
  background-color:var(--void);
  background-image:
    radial-gradient(120% 62% at 50% -12%, #10284a 0%, rgba(16,40,74,0) 62%),
    radial-gradient(70% 44% at 100% 8%, rgba(143,107,255,.14) 0%, rgba(143,107,255,0) 70%),
    radial-gradient(80% 50% at 0% 92%, rgba(90,23,51,.32) 0%, rgba(90,23,51,0) 72%);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:800;line-height:1.06;letter-spacing:-.01em}
p{margin:0 0 1.05em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0}
a{color:var(--violet);text-decoration:none}
a:hover{color:var(--gold)}
::selection{background:rgba(245,196,81,.28);color:var(--paper)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

/* ---------- layout ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(36px,5.6vw,74px)}
.section--rule{border-top:1px solid rgba(42,71,104,.6)}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:clamp(12px,2vw,28px);margin-bottom:clamp(18px,3vw,32px)}
.section__kicker{margin:0 0 8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--gold)}
.section__title{margin:0;font-size:clamp(26px,4.4vw,46px);line-height:1.02}
.section__note{margin:0;max-width:26em;font-size:13px;line-height:1.7;color:var(--dim)}
.lede{font-size:clamp(15px,1.6vw,17.5px);line-height:1.68;color:var(--dim);max-width:34em}
.meta-label{display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
.num{font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.divider{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--line),rgba(42,71,104,0))}
.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}

.grid{display:grid;gap:clamp(18px,2.6vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--aside{grid-template-columns:minmax(0,250px) minmax(0,1fr)}

/* ---------- buttons & links ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 16px;border:1px solid transparent;border-radius:2px;
  font-family:var(--font-body);font-size:13px;font-weight:700;letter-spacing:.06em;
  text-decoration:none;cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn__icon{font-size:11px;line-height:1;opacity:.85}
.btn--gold{background:var(--gold);color:#08131f;border-color:var(--gold)}
.btn--gold:hover{background:#ffd977;color:#08131f;box-shadow:0 10px 26px -16px rgba(245,196,81,.9)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn--ghost:hover{border-color:var(--violet);color:var(--violet);background:rgba(143,107,255,.1)}
.btn--violet{background:rgba(143,107,255,.16);border-color:rgba(143,107,255,.55);color:var(--paper)}
.btn--violet:hover{background:rgba(143,107,255,.3);border-color:var(--violet);color:#fff}
.link-arrow{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;font-weight:700;letter-spacing:.04em;color:var(--gold);text-decoration:none}
.link-arrow::after{content:"→";transition:transform .2s var(--ease)}
.link-arrow:hover{color:var(--paper)}
.link-arrow:hover::after{transform:translateX(4px)}

/* ---------- tags ---------- */
.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border:1px solid currentColor;border-radius:999px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;line-height:1.5;white-space:nowrap}
.tag--gold{color:var(--gold);background:rgba(245,196,81,.1)}
.tag--green{color:var(--green);background:rgba(53,208,127,.1)}
.tag--amber{color:var(--amber);background:rgba(255,159,67,.1)}
.tag--violet{color:var(--violet);background:rgba(143,107,255,.13)}

/* ---------- breadcrumbs ---------- */
.crumbs{margin-bottom:clamp(16px,2.4vw,26px)}
.crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;list-style:none;margin:0;padding:0}
.crumbs__item{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.crumbs__link{color:var(--dim);text-decoration:none;border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.crumbs__link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.crumbs__sep{color:var(--line)}
.crumbs__current{color:var(--gold)}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:12px;top:-72px;z-index:400;
  padding:12px 20px;border-radius:2px;
  background:var(--gold);color:#08131f;font-weight:700;font-size:13px;text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px;color:#08131f}

/* ---------- header ---------- */
.masthead{
  position:sticky;top:0;z-index:100;
  background:linear-gradient(180deg,rgba(7,20,38,.97) 0%,rgba(9,24,44,.9) 100%);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .3s var(--ease);
}
.masthead[data-stuck]{box-shadow:0 22px 44px -34px rgba(0,0,0,.95)}
.masthead__glow{
  position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,rgba(90,23,51,0),var(--gold) 28%,var(--violet) 68%,rgba(143,107,255,0));
  opacity:.6;pointer-events:none;
}
.masthead__inner{padding-block:14px 0}
.masthead__top{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;padding-bottom:10px}
.masthead__meta{margin:0;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--dim)}
.masthead__tools{grid-column:3;display:flex;align-items:center;justify-content:flex-end;gap:10px}

.brand{grid-column:2;justify-self:center;display:flex;flex-direction:column;align-items:center;gap:3px;text-decoration:none;color:var(--text)}
.brand__mark{font-size:11px;line-height:1;color:var(--gold);letter-spacing:.4em;text-indent:.4em}
.brand__word{font-family:var(--font-display);font-size:clamp(22px,3.2vw,32px);font-weight:800;line-height:1;letter-spacing:.2em;text-indent:.2em;color:var(--paper)}
.brand__sub{font-family:var(--font-mono);font-size:9px;line-height:1;letter-spacing:.34em;text-indent:.34em;color:var(--dim)}
.brand:hover .brand__word{color:var(--gold)}
.brand:hover .brand__mark{color:var(--violet)}

.round-chip{
  display:inline-flex;align-items:baseline;gap:7px;
  padding:6px 12px;border:1px solid var(--line);border-radius:2px;
  background:rgba(27,51,80,.42);color:var(--text);text-decoration:none;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.round-chip:hover{border-color:var(--gold);background:rgba(27,51,80,.85);color:var(--text)}
.round-chip__k{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim)}
.round-chip__v{font-family:var(--font-mono);font-size:17px;font-weight:700;line-height:1;color:var(--gold)}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;border:1px solid var(--line);border-radius:2px;
  background:rgba(27,51,80,.42);color:var(--text);cursor:pointer;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--violet);color:var(--violet)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:18px}
.nav-toggle__bars span{display:block;height:1.5px;width:100%;background:currentColor;transition:transform .25s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"]{border-color:var(--gold);color:var(--gold)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

.nav{border-top:1px solid rgba(42,71,104,.7)}
.nav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:clamp(4px,2vw,28px);list-style:none;margin:0;padding:0}
.nav__item{display:block}
.nav__link{
  position:relative;display:inline-block;padding:13px 4px;
  font-size:14px;letter-spacing:.1em;color:var(--dim);text-decoration:none;
  transition:color .2s var(--ease);
}
.nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:7px;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease),background .2s var(--ease);
}
.nav__link:hover{color:var(--text)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--gold)}
.nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--violet)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,8vw,96px);
  background:linear-gradient(180deg,var(--night) 0%,#050e1b 100%);
  border-top:1px solid var(--line);
  color:var(--text);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--wine),var(--gold) 45%,var(--violet));
  opacity:.85;
}
.footer__grid{display:grid;grid-template-columns:1.5fr 1fr 1.35fr .95fr;gap:clamp(22px,3.6vw,52px);padding-block:clamp(38px,5.6vw,68px)}
.footer__col{min-width:0}
.footer__col--brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.brand--footer{grid-column:auto;justify-self:start;flex-direction:row;align-items:baseline;gap:9px}
.brand--footer .brand__word{font-size:26px;letter-spacing:.14em;text-indent:.14em}
.footer__tagline{margin:0;font-family:var(--font-display);font-size:clamp(18px,2.2vw,22px);font-weight:700;line-height:1.3;color:var(--paper)}
.footer__text{margin:0;font-size:13px;line-height:1.7;color:var(--dim)}
.footer__title{
  margin:0 0 14px;font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--gold);
}
.footer__list{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.footer__link{display:inline-block;font-size:13.5px;color:var(--dim);text-decoration:none;border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.footer__link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.footer__row{display:flex;gap:10px;padding:6px 0;border-bottom:1px solid rgba(42,71,104,.45);font-size:13px;line-height:1.6}
.footer__row:last-of-type{border-bottom:0}
.footer__label{flex:0 0 42px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);padding-top:3px}
.footer__value{flex:1 1 auto;min-width:0;color:var(--text);word-break:break-word}
.footer__note{margin:12px 0 0;font-size:12px;line-height:1.7;color:var(--dim);max-width:30em}
.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;
  padding-block:16px 22px;border-top:1px solid rgba(42,71,104,.6);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--dim);
}
.footer__copy,.footer__icp{margin:0}

/* ---------- research board ---------- */
.board{
  position:relative;padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--line);border-radius:2px;
  background:linear-gradient(180deg,rgba(27,51,80,.58) 0%,rgba(13,32,56,.75) 100%);
  box-shadow:0 22px 50px -34px rgba(0,0,0,.95);
}
.board::before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--gold),var(--violet));opacity:.9}
.board--wine{background:linear-gradient(180deg,rgba(90,23,51,.5) 0%,rgba(13,32,56,.82) 100%)}
.board__kicker{margin:0 0 8px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold)}
.board__title{margin:0 0 10px;font-size:clamp(20px,2.6vw,28px);line-height:1.12;color:var(--paper)}
.board__body{margin:0;font-size:14.5px;line-height:1.68;color:var(--dim)}
.board__meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:16px}
.board__list{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:10px}
.board__item{padding-top:10px;border-top:1px solid rgba(42,71,104,.7);font-size:13.5px;line-height:1.62;color:var(--dim)}
.board__item:first-child{padding-top:0;border-top:0}
.board__item strong{color:var(--text);font-weight:600}

/* ---------- media ---------- */
.media{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:2px;background:linear-gradient(160deg,#0d2038,#050d18)}
.media::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(78% 58% at 50% 0%,rgba(245,196,81,.16),rgba(245,196,81,0) 72%)}
.media__img{display:block;width:100%;height:100%;aspect-ratio:16/9;object-fit:cover;
  filter:saturate(.92) contrast(1.08) brightness(.86)}
.media--wide .media__img{aspect-ratio:21/9}
.media--tall .media__img{aspect-ratio:3/4}
.media__cap{display:block;margin-top:8px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;color:var(--dim)}

/* ---------- filter ---------- */
.filter{display:flex;flex-wrap:wrap;gap:8px}
.filter__btn{
  appearance:none;-webkit-appearance:none;cursor:pointer;
  padding:7px 13px;border:1px solid var(--line);border-radius:2px;
  background:rgba(13,32,56,.6);color:var(--dim);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.filter__btn:hover{border-color:var(--violet);color:var(--text)}
.filter__btn[aria-pressed="true"]{background:rgba(143,107,255,.2);border-color:var(--violet);color:var(--paper);box-shadow:inset 0 0 0 1px rgba(143,107,255,.35)}

/* ---------- round rail ---------- */
.rail{display:flex;gap:6px;overflow-x:auto;padding:6px 0 10px;border-bottom:1px solid var(--line);scrollbar-width:thin}
.rail__btn{
  flex:0 0 auto;display:inline-flex;align-items:baseline;gap:6px;
  padding:8px 13px;border:1px solid var(--line);border-radius:2px;
  background:rgba(13,32,56,.72);color:var(--dim);text-decoration:none;cursor:pointer;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.rail__btn:hover{border-color:var(--violet);color:var(--text)}
.rail__btn[aria-current="true"],.rail__btn[aria-pressed="true"],.rail__btn.is-active{background:rgba(245,196,81,.14);border-color:var(--gold);color:var(--gold)}
.rail__num{font-weight:700}

/* ---------- motion ---------- */
[data-reveal]{transition:opacity .65s var(--ease),transform .65s var(--ease)}
.js [data-reveal]{opacity:0;transform:translateY(14px)}
.js [data-reveal].is-in{opacity:1;transform:none}
[data-filter-item].is-shown{animation:filterFade .34s var(--ease) both}
@keyframes filterFade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.progress{
  position:fixed;left:0;top:0;z-index:300;width:100%;height:2px;
  transform:scaleX(0);transform-origin:0 50%;pointer-events:none;
  background:linear-gradient(90deg,var(--gold),var(--violet));
  box-shadow:0 0 12px rgba(143,107,255,.55);
}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .masthead__inner{padding-block:11px 0}
  .masthead__top{grid-template-columns:auto 1fr auto;gap:10px;padding-bottom:9px}
  .masthead__meta{display:none}
  .masthead__tools{grid-column:1;justify-content:flex-start;gap:8px}
  .brand{grid-column:2;justify-self:center}
  .nav-toggle{display:inline-flex;grid-column:3;justify-self:end}
  .nav{display:none;border-top:1px solid var(--line)}
  .masthead[data-open] .nav{display:block}
  .nav__list{flex-direction:column;justify-content:flex-start;gap:0;padding:4px 0 14px}
  .nav__item{border-bottom:1px solid rgba(42,71,104,.5)}
  .nav__item:last-child{border-bottom:0}
  .nav__link{display:block;padding:13px 2px;font-size:15px;letter-spacing:.08em}
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{color:var(--gold);border-left:2px solid var(--violet);padding-left:10px}
  .grid--aside,.grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:720px){
  .footer__grid{grid-template-columns:minmax(0,1fr);gap:30px}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:6px}
  .brand__word{font-size:23px}
}
@media (max-width:560px){
  .masthead__tools .btn--ghost{display:none}
  .round-chip{padding:5px 10px}
  .round-chip__v{font-size:15px}
  .section__head{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .js [data-reveal]{opacity:1;transform:none}
}