:root {
  --ink: #05080b;
  --ink-2: #0a1015;
  --ice: #f4f8fb;
  --paper: #f6f7f8;
  --cyan: #19c9ff;
  --cyan-soft: #8be5ff;
  --muted: #91a0aa;
  --line: rgba(255,255,255,.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html:lang(zh-Hans) {
  font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}
body {
  margin: 0;
  background: var(--ink);
  color: var(--ice);
  font-family: Inter, Arial, sans-serif;
  overflow-x: hidden;
}
body::selection { background: var(--cyan); color: #001018; }
button, a { font: inherit; }
a { color: inherit; text-decoration: none; }

.boot {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  background: #020507;
  pointer-events: none;
  animation: bootAway 1.1s 1.35s forwards;
}
.boot-mark {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(3.5rem, 9vw, 8rem);
  font-weight: 300;
  letter-spacing: .18em;
  margin-left: .18em;
  text-shadow: 0 0 28px rgba(25,201,255,.5);
  animation: bootMark 1.1s ease forwards;
}
.boot-line {
  position: absolute;
  width: 1px;
  height: 0;
  background: linear-gradient(transparent, var(--cyan), transparent);
  animation: bootLine 1.1s .2s ease forwards;
}
@keyframes bootMark { 0%{opacity:0;filter:blur(18px);transform:scale(.93)} 100%{opacity:1;filter:blur(0);transform:scale(1)} }
@keyframes bootLine { 0%{height:0;opacity:0} 100%{height:60vh;opacity:.8} }
@keyframes bootAway { to{opacity:0;visibility:hidden;filter:blur(18px)} }

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: 112px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4vw;
  transition: color .35s ease, background .35s ease;
  mix-blend-mode: normal;
}
.topbar.light { color: #071018; background: rgba(246,247,248,.78); backdrop-filter: blur(14px); }
.brand { display: flex; align-items: center; gap: 24px; }
.brand-mark {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  letter-spacing: .16em;
  margin-right: -.16em;
  font-weight: 300;
}
.brand-divider { width: 1px; height: 34px; background: currentColor; opacity: .65; }
.brand-name { font-size: .66rem; text-transform: uppercase; letter-spacing: .2em; line-height: 1.45; white-space: nowrap; }
.languages { display: flex; align-items: center; gap: 18px; }
.languages button { border: 0; background: transparent; color: inherit; cursor: pointer; text-transform: uppercase; font-size: .72rem; letter-spacing: .18em; padding: 6px 0; opacity: .72; }
.languages button.active { opacity: 1; }
.lang-divider { width: 1px; height: 24px; background: currentColor; opacity: .3; }
.menu-button { width: 34px; height: 26px; display: grid; align-content: center; gap: 7px; margin-left: 12px; }
.menu-button span { display: block; width: 100%; height: 1px; background: currentColor; }

.rail {
  position: fixed;
  z-index: 55;
  right: 4vw;
  top: 50%;
  transform: translateY(-50%);
  width: 170px;
  height: 500px;
  color: white;
  transition: color .35s ease;
}
.rail.light { color: #071018; }
.rail-line { position: absolute; left: 0; top: 0; width: 1px; height: 100%; background: currentColor; opacity: .65; }
.rail nav { height: 100%; display: grid; grid-template-rows: repeat(6, 1fr); }
.rail-link {
  position: relative;
  display: flex;
  align-items: center;
  padding-left: 39px;
  text-transform: uppercase;
  letter-spacing: .18em;
  font-size: .72rem;
  opacity: .82;
}
html:lang(zh-Hans) .rail-link,
html:lang(zh-Hans) .languages button,
html:lang(zh-Hans) .eyebrow,
html:lang(zh-Hans) .event-title p,
html:lang(zh-Hans) .join-button,
html:lang(zh-Hans) .text-link,
html:lang(zh-Hans) footer {
  letter-spacing: .08em;
}
html:lang(zh-Hans) .hero-center p {
  letter-spacing: .12em;
}
.rail-link:hover, .rail-link.active { opacity: 1; }
.rail-dot {
  position: absolute;
  left: 4px;
  width: 5px;
  height: 5px;
  transform: rotate(45deg);
  background: currentColor;
  opacity: .28;
}
.rail-link.active .rail-dot { opacity: 0; }
.rail-indicator {
  position: absolute;
  z-index: 3;
  left: -12px;
  top: 19px;
  width: 26px;
  height: 38px;
  display: grid;
  place-items: center;
  transition: transform .65s cubic-bezier(.22,.9,.25,1), filter .35s ease;
  filter: drop-shadow(0 0 9px var(--cyan));
}
.indicator-triangle {
  width: 0;
  height: 0;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  border-left: 19px solid currentColor;
  transform-origin: 25% 50%;
  animation: triangleFloat 2.2s ease-in-out infinite;
}
.rail.moving .indicator-triangle { animation: triangleBasculate .62s ease; }
@keyframes triangleFloat { 50% { transform: translateX(3px); filter: drop-shadow(0 0 10px var(--cyan)); } }
@keyframes triangleBasculate { 0%{transform:rotate(0deg) scale(1)} 45%{transform:rotate(78deg) scale(.82)} 70%{transform:rotate(98deg) scale(.9)} 100%{transform:rotate(0deg) scale(1)} }

.hero {
  position: relative;
  height: 100svh;
  min-height: 720px;
  overflow: hidden;
  background: #03080c;
}
.hero-bg {
  position: absolute;
  inset: -3%;
  background: url('assets/hero.png') center center / cover no-repeat;
  transform: scale(1.06);
  animation: heroBreath 10s ease-out forwards;
  will-change: transform, filter;
}
@keyframes heroBreath { to { transform: scale(1); } }
.hero-overlay { position:absolute; inset:0; background: radial-gradient(circle at 50% 57%, rgba(17,190,255,.02) 0 12%, rgba(0,0,0,.08) 46%, rgba(0,0,0,.34) 100%); }
.hero-grid { position:absolute; inset:0; background-image: linear-gradient(rgba(25,201,255,.035) 1px, transparent 1px),linear-gradient(90deg,rgba(25,201,255,.035) 1px,transparent 1px); background-size: 80px 80px; mask-image: linear-gradient(to bottom,transparent,black 18%,black 78%,transparent); opacity:.24; }
.location-block { position:absolute; z-index:4; left:4vw; top:20%; text-transform:uppercase; letter-spacing:.22em; font-size:.72rem; line-height:1.45; }
.location-block span { display:block; width:48px; height:1px; background:rgba(255,255,255,.72); margin:18px 0 28px; }
.location-block .coords { line-height:1.8; }
.hero-center { position:absolute; z-index:4; left:50%; top:48%; transform:translate(-50%,-50%); text-align:center; width:min(720px,64vw); animation: heroCopyIn 1.5s 1.7s both cubic-bezier(.2,.8,.2,1); }
@keyframes heroCopyIn { from {opacity:0; filter:blur(14px); transform:translate(-50%,-46%) scale(.96)} to {opacity:1;filter:blur(0);transform:translate(-50%,-50%) scale(1)} }
.hero-center h1 { margin:0; font-family:'Space Grotesk',sans-serif; font-size:clamp(5rem,11vw,10.6rem); line-height:.83; letter-spacing:.14em; margin-right:-.14em; font-weight:300; text-shadow:0 0 20px rgba(168,235,255,.82), 0 0 50px rgba(25,201,255,.25); }
.logo-glyph { display:inline-block; transform:scaleX(.86); transform-origin:center; }
.hero-center p { margin:34px auto 0; font-size:clamp(.75rem,1.15vw,1.15rem); line-height:1.55; text-transform:uppercase; letter-spacing:.22em; }
.explore { position:absolute; z-index:5; left:50%; bottom:7.5vh; transform:translateX(-50%); display:flex; flex-direction:column; align-items:center; gap:11px; text-transform:uppercase; font-size:.68rem; letter-spacing:.34em; }
.explore-label { opacity:.9; }
.mouse { width:34px; height:58px; border:1px solid rgba(255,255,255,.92); border-radius:19px; display:flex; justify-content:center; padding-top:12px; }
.mouse i { width:3px; height:3px; border-radius:50%; background:#fff; box-shadow:0 0 8px var(--cyan); animation:scrollDot 1.6s infinite; }
@keyframes scrollDot { 0%{transform:translateY(0);opacity:1} 80%{transform:translateY(25px);opacity:0} 100%{opacity:0} }
.hero-fade { position:absolute; z-index:3; inset:auto 0 0; height:26%; background:linear-gradient(transparent,#03080c); opacity:.62; }

.content-section { position:relative; min-height:100svh; padding:150px 14vw 120px 8vw; background:var(--paper); color:#071018; overflow:hidden; }
.section-dark { background:#05090d; color:var(--ice); }
.section-index { position:absolute; left:4vw; top:136px; font-size:.64rem; letter-spacing:.2em; opacity:.42; writing-mode:vertical-rl; transform:rotate(180deg); }
.content-wrap { max-width:1200px; margin:0 auto; }
.split { display:grid; grid-template-columns:1.25fr .75fr; gap:10vw; align-items:start; }
.eyebrow { text-transform:uppercase; letter-spacing:.22em; font-size:.68rem; margin:0 0 46px; color:#147da0; }
.section-dark .eyebrow { color:var(--cyan-soft); }
h2 { margin:0; font-family:'Space Grotesk',sans-serif; font-size:clamp(3rem,6vw,6.8rem); line-height:.95; letter-spacing:-.045em; font-weight:300; }
h2 span { color:#6e7d87; }
.lead-copy { padding-top:110px; font-size:clamp(1rem,1.5vw,1.35rem); line-height:1.7; color:#46535c; }
.text-link { display:inline-flex; gap:18px; margin-top:34px; text-transform:uppercase; letter-spacing:.17em; font-size:.68rem; color:#071018; }
.signal-line { position:absolute; left:8vw; right:14vw; bottom:78px; height:1px; background:#c9d1d5; }
.signal-line span { display:block; width:24%; height:100%; background:var(--cyan); box-shadow:0 0 12px rgba(25,201,255,.8); }

.events { display:flex; align-items:center; }
.event-feature { display:grid; grid-template-columns:160px 1fr 80px; align-items:end; gap:3vw; margin-top:11vh; border-top:1px solid rgba(255,255,255,.22); border-bottom:1px solid rgba(255,255,255,.22); padding:54px 0; }
.event-date span { display:block; font-family:'Space Grotesk'; font-size:5rem; font-weight:300; line-height:1; color:var(--cyan-soft); }
.event-date small { display:block; letter-spacing:.25em; margin-top:10px; }
.event-title p { text-transform:uppercase; letter-spacing:.18em; color:#8aa2b0; font-size:.72rem; }
.event-title h2 { font-size:clamp(2.7rem,5vw,5.4rem); }
.round-link { width:64px; height:64px; border:1px solid rgba(255,255,255,.4); border-radius:50%; display:grid; place-items:center; font-size:1.3rem; transition:.3s; }
.round-link:hover { border-color:var(--cyan); box-shadow:0 0 24px rgba(25,201,255,.25); transform:rotate(45deg); }

.network h2 { max-width:800px; }
.network-canvas { position:relative; margin-top:70px; height:460px; border:1px solid #d6dde0; background:radial-gradient(circle at 50% 60%, rgba(25,201,255,.12), transparent 35%), linear-gradient(#f8fafb,#eef2f4); overflow:hidden; }
.network-globe { position:absolute; width:300px; height:300px; border:1px solid rgba(7,16,24,.28); border-radius:50%; left:50%; top:56%; transform:translate(-50%,-50%); box-shadow:inset 0 0 60px rgba(25,201,255,.12),0 0 45px rgba(25,201,255,.12); background:repeating-radial-gradient(circle at center, transparent 0 28px, rgba(7,16,24,.08) 29px 30px),repeating-linear-gradient(90deg,transparent 0 42px,rgba(7,16,24,.06) 43px 44px); }
.network-canvas svg { position:absolute; inset:0; width:100%; height:100%; }
.network-canvas path { fill:none; stroke:#19c9ff; stroke-width:1.2; stroke-dasharray:8 9; filter:drop-shadow(0 0 4px rgba(25,201,255,.7)); animation:dash 14s linear infinite; }
@keyframes dash { to { stroke-dashoffset:-170; } }
.node { position:absolute; z-index:3; display:grid; place-items:center; width:48px; height:48px; border-radius:50%; border:1px solid #0b7fa7; background:#fff; color:#071018; font-size:.67rem; letter-spacing:.12em; box-shadow:0 0 16px rgba(25,201,255,.22); }
.node-ch{left:48%;top:53%}.node-fr{left:19%;top:28%}.node-cn{right:15%;top:24%}

.committee { display:flex; align-items:center; }
.committee .split { align-items:center; }
.committee h2 { font-size:clamp(2.9rem,5vw,5.6rem); }
.committee-grid { display:grid; gap:18px; }
.committee-grid article { border:1px solid rgba(255,255,255,.17); padding:28px; background:linear-gradient(135deg,rgba(255,255,255,.04),rgba(25,201,255,.025)); }
.committee-grid article span { color:var(--cyan-soft); font-size:.67rem; letter-spacing:.18em; }
.committee-grid h3 { font-family:'Space Grotesk'; font-weight:400; font-size:1.6rem; margin:34px 0 12px; }
.committee-grid p { color:#8f9ba3; line-height:1.65; margin:0; }

.join { display:flex; align-items:center; min-height:82svh; }
.join-wrap { text-align:center; }
.join-wrap h2 { font-size:clamp(4rem,8vw,8rem); }
.join-wrap>p:not(.eyebrow) { color:#687782; font-size:1.15rem; margin:30px 0 44px; }
.join-button { display:inline-flex; align-items:center; gap:30px; background:#071018; color:#fff; padding:18px 26px; text-transform:uppercase; letter-spacing:.16em; font-size:.72rem; border:1px solid #071018; transition:.3s; }
.join-button:hover { background:var(--cyan); color:#001018; border-color:var(--cyan); box-shadow:0 0 28px rgba(25,201,255,.35); }

footer { min-height:150px; background:#05090d; color:#7f8c95; display:flex; justify-content:space-between; align-items:center; padding:0 4vw; text-transform:uppercase; font-size:.61rem; letter-spacing:.18em; }

@media (max-width: 980px) {
  .topbar { height:84px; padding:0 22px; }
  .brand-name, .brand-divider { display:none; }
  .brand-mark { font-size:1.55rem; }
  .rail { display:none; }
  .location-block { left:24px; top:18%; }
  .hero-center { width:88vw; }
  .hero-center h1 { font-size:clamp(4rem,21vw,8rem); }
  .hero-center p { font-size:.72rem; }
  .content-section { padding:120px 26px 90px; }
  .section-index { display:none; }
  .split { grid-template-columns:1fr; gap:44px; }
  .lead-copy { padding-top:0; }
  .event-feature { grid-template-columns:1fr; align-items:start; }
  .round-link { margin-top:20px; }
  .network-canvas { height:360px; }
  footer { flex-direction:column; justify-content:center; gap:18px; text-align:center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior:auto; }
  *, *::before, *::after { animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; }
}