:root {
  color-scheme: dark;
  --page: #060a12;
  --ink: #f0f2f5;
  --body: #b4becd;
  --muted: #96a3b7;
  --accent: #a8c8f4;
  --line: rgba(151, 175, 206, .2);
  --font: Inter, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-family: var(--font);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
html { background: var(--page); }
body { margin: 0; background: var(--page); color: var(--ink); }
button, a, summary { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
button[hidden] { display: none; }
::selection { color: #fff; background: #284365; }
#particle-field, .ambient { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; }
#particle-field { z-index: 0; }
.ambient { z-index: 1; background: radial-gradient(ellipse at 50% 37%, rgba(54, 96, 151, .09), transparent 57%); }
.page { position: relative; z-index: 2; width: min(calc(100% - 112px), 1328px); min-height: 100svh; margin-inline: auto; display: flex; flex-direction: column; }
.masthead { display: flex; justify-content: space-between; align-items: center; min-height: 104px; }
.monogram { display: inline-flex; align-items: center; height: 44px; font-size: 25px; font-weight: 600; letter-spacing: -2px; }
.monogram span { margin-left: 4px; font-weight: 300; color: var(--accent); }
.masthead-note { color: var(--muted); font-size: 10px; letter-spacing: .18em; }
main { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; padding-block: 56px 64px; }
.identity { text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 14px; margin: 0 0 24px; font-size: 18px; font-weight: 400; letter-spacing: .22em; color: var(--accent); }
h1 { margin: 0; font-size: clamp(72px, 8.4vw, 122px); font-weight: 600; line-height: 1.08; letter-spacing: -.065em; }
h1 span { font-weight: 300; margin-left: .08em; }
.intro { margin: 28px 0 0; color: var(--body); font-size: 17px; line-height: 1.8; letter-spacing: .1em; }
.identity-line { width: 1px; height: 48px; margin: 44px auto 0; background: linear-gradient(var(--line), transparent); }
.directions { width: min(100%, 920px); display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 40px; }
.direction { min-width: 0; padding: 0 48px 0 32px; }
.direction + .direction { border-left: 1px solid var(--line); padding: 0 16px 0 64px; }
.direction-label { margin: 0 0 16px; font-size: 10px; letter-spacing: .17em; color: var(--muted); }
h2 { margin: 0; font-size: 30px; font-weight: 400; line-height: 1.25; letter-spacing: -.035em; }
.definition { display: block; margin-top: 8px; font-size: 15px; line-height: 1.5; letter-spacing: 0; color: var(--body); }
.organization-title { font-size: 29px; line-height: 1.45; }
.accent { color: var(--accent); }
.direction-en { margin: 14px 0 0; color: var(--body); font-size: 14px; line-height: 1.6; }
.direction-cn { margin: 6px 0 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
details { margin-top: 16px; }
summary { display: flex; align-items: center; justify-content: space-between; width: fit-content; min-height: 44px; gap: 24px; cursor: pointer; list-style: none; color: var(--body); font-size: 12px; transition: color .2s; }
summary::-webkit-details-marker { display: none; }
summary:hover { color: var(--ink); }
.expand { display: inline-block; position: relative; width: 10px; height: 10px; }
.expand::before, .expand::after { position: absolute; content: ""; left: 0; top: 4px; width: 10px; height: 1px; background: currentColor; }
.expand::after { transform: rotate(90deg); transition: transform .2s; }
details[open] .expand::after { transform: rotate(0); }
.detail-content p { font-size: 14px; line-height: 1.9; margin: 8px 0 0; color: var(--body); max-width: 32em; }
.footer { position: relative; min-height: 76px; display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; border-top: 1px solid rgba(151, 175, 206, .12); font-size: 11px; color: var(--muted); letter-spacing: .05em; }
.site-address { text-align: center; font-size: 13px; letter-spacing: .09em; color: var(--body); }
.motion-toggle { display: inline-flex; justify-self: end; align-items: center; justify-content: center; min-height: 44px; gap: 8px; padding: 0 4px; background: transparent; border: 0; color: var(--muted); font-size: 11px; cursor: pointer; }
.motion-toggle:hover { color: var(--ink); }
.pause-symbol { width: 7px; height: 8px; border-left: 2px solid currentColor; border-right: 2px solid currentColor; }
.motion-toggle[data-motion-state="paused"] .pause-symbol { width: 0; height: 0; border-top: 4px solid transparent; border-bottom: 4px solid transparent; border-left: 6px solid currentColor; border-right: 0; }
@media (min-width: 768px) and (max-height: 760px) {
  .masthead { min-height: 80px; }
  main { padding-block: 32px; }
  .identity-line { height: 32px; margin-top: 28px; }
  .directions { margin-top: 24px; }
}
@media (max-width: 1050px) {
  .page { width: calc(100% - 64px); }
  .direction { padding-inline: 24px 32px; }
  .direction + .direction { padding-inline: 40px 0; }
}
@media (max-width: 767px) {
  .page { width: calc(100% - 48px); }
  .masthead { min-height: 80px; }
  .masthead-note { font-size: 9px; letter-spacing: .1em; }
  main { padding-block: 56px 48px; }
  .eyebrow { font-size: 15px; margin-bottom: 24px; }
  h1 { font-size: clamp(60px, 11.9vw, 90px); }
  .intro { max-width: 24em; font-size: 15px; line-height: 1.95; letter-spacing: .04em; margin-top: 24px; text-wrap: balance; }
  .identity-line { height: 32px; margin-top: 32px; }
  .directions { margin-top: 32px; grid-template-columns: 1fr; gap: 28px; max-width: 440px; }
  .direction { padding: 0; }
  .direction + .direction { padding: 28px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .direction-label { margin-bottom: 12px; }
  h2 { font-size: 28px; }
  .direction-en { margin-top: 10px; }
  details { margin-top: 8px; }
  .footer { grid-template-columns: 1fr 1fr; min-height: 92px; padding-block: 16px; gap: 4px 16px; }
  .site-address { grid-column: 2; grid-row: 1; text-align: right; }
  .motion-toggle { justify-self: start; padding: 0; min-height: 36px; }
}
@media (max-width: 359px) {
  .page { width: calc(100% - 40px); }
  .masthead-note { max-width: 156px; line-height: 1.8; text-align: right; }
  h1 { font-size: 57px; }
  .intro { max-width: 18em; }
  .direction-en { font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}