:root {
  --black: #050505;
  --ink: #111318;
  --muted: #626b78;
  --white: #ffffff;
  --paper: #f5f7fb;
  --line: rgba(255,255,255,.18);
  --line-dark: rgba(17,19,24,.14);
  --red: #4ca573;
  --blue: #0b3d91;
  --deep-blue: #071a3d;
  --cyan: #7fd7ff;
  --font: Inter, "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  z-index: 1000;
  padding: .8rem 1rem;
  background: var(--white);
  color: var(--black);
}
.skip-link:focus { left: 1rem; }

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(0,0,0,.78);
  color: var(--white);
  border-bottom: 1px solid rgba(255,255,255,.14);
  backdrop-filter: blur(18px);
  transition: background .25s ease, box-shadow .25s ease;
}
.site-header.is-scrolled { background: rgba(0,0,0,.94); box-shadow: 0 16px 40px rgba(0,0,0,.28); }
.header-inner {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  height: 82px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
}
.brand { display: flex; align-items: center; gap: .9rem; min-width: 260px; }
.brand-mark {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.22rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.035em;
  color: var(--white);
  position: relative;
  isolation: isolate;
  background:
    radial-gradient(circle at 34% 26%, rgba(255,255,255,.25) 0 7%, transparent 8%),
    radial-gradient(circle at 50% 35%, rgba(127,215,255,.16), transparent 45%),
    linear-gradient(145deg, #173f92 0%, #0b2d73 46%, #05122b 100%);
  border: 1px solid rgba(255,255,255,.16);
  box-shadow:
    inset 0 0 0 3px rgba(255,255,255,.08),
    inset 0 -12px 18px rgba(0,0,0,.3),
    0 10px 28px rgba(0,0,0,.34),
    0 0 28px rgba(11,61,145,.32);
  text-shadow:
    0 2px 0 rgba(0,0,0,.55),
    0 0 12px rgba(255,255,255,.16),
    0 0 22px rgba(127,215,255,.34);
}
.brand-mark::before {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.09);
  box-shadow: inset 0 0 16px rgba(255,255,255,.06);
  z-index: -1;
}
.brand-mark::after {
  content: none;
}
.brand-text { display: grid; line-height: 1.1; }
.brand-text strong { font-size: 2.85rem; letter-spacing: .01em; }
.brand-text small { color: rgba(255,255,255,.68); font-weight: 600; margin-top: .2rem; }
.main-nav { justify-self: center; display: flex; align-items: center; gap: 1.35rem; font-weight: 800; font-size: .9rem; }
.main-nav a { opacity: .86; position: relative; }
.main-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -.5rem; height: 3px; background: var(--red); transition: right .2s ease; }
.main-nav a:hover { opacity: 1; }
.main-nav a:hover::after { right: 0; }
.header-cta, .btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px;
  padding: .85rem 1.15rem;
  border-radius: 0;
  font-weight: 900;
  letter-spacing: .01em;
  transition: transform .2s ease, background .2s ease, color .2s ease;
}
.header-cta { background: var(--red); color: var(--white); }
.header-cta:hover, .btn:hover { transform: translateY(-2px); }
.menu-toggle { display: none; background: transparent; border: 0; padding: .4rem; }
.menu-toggle span { display: block; width: 28px; height: 2px; background: var(--white); margin: 6px 0; }

.hero {
  min-height: 100vh;
  padding: 132px 0 72px;
  position: relative;
  overflow: hidden;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(0,0,0,.92), rgba(0,0,0,.58) 48%, rgba(0,0,0,.34)),
    radial-gradient(circle at 75% 30%, rgba(11,61,145,.72), transparent 34%),
    linear-gradient(145deg, #020409, #0b1020 58%, #020409);
}
.starfield {
  position: absolute;
  inset: -18%;
  opacity: .58;
  overflow: hidden;
  mix-blend-mode: screen;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 42%, rgba(76,165,115,.16), transparent 30%),
    radial-gradient(circle at 76% 38%, rgba(127,215,255,.13), transparent 24%);
  mask-image: radial-gradient(ellipse at center, #000 0 64%, transparent 92%);
}
.starfield::before,
.starfield::after {
  content: "";
  position: absolute;
  inset: -10%;
  background-image:
    radial-gradient(circle, rgba(255,255,255,.70) 0 1.25px, transparent 1.55px),
    radial-gradient(circle, rgba(76,165,115,.52) 0 1.15px, transparent 1.5px);
  background-size: 68px 117.8px, 68px 117.8px;
  background-position: 0 0, 34px 58.9px;
  opacity: .58;
  transform-origin: 50% 50%;
  filter: drop-shadow(0 0 8px rgba(127,215,255,.35));
}
.starfield::before {
  /* Static lattice layer: gives a stable reference lattice. */
  opacity: .52;
  transform: rotate(2.2deg) scale(1.02);
  animation: none;
}
.starfield::after {
  /* Moving lattice layer: slow relative rotation creates the moiré beat. */
  background-size: 7.8px 12.26px, 7.08px 12.26px;
  background-position: 0 0, 35.4px 61.3px;
  opacity: .50;
  transform: rotate(-2.1deg) scale(1.015);
  animation: moireRotateOneLayer 92s linear infinite;
}
@keyframes moireRotateOneLayer {
  from { transform: rotate(-2.1deg) scale(1.015); }
  to { transform: rotate(357.9deg) scale(1.015); }
}
.orb { position: absolute; border-radius: 50%; filter: blur(4px); opacity: .52; }
.orb-a { width: 420px; height: 420px; right: 8%; top: 22%; background: radial-gradient(circle, rgba(11,61,145,.9), transparent 62%); }
.orb-b { width: 240px; height: 240px; right: 24%; bottom: 12%; background: radial-gradient(circle, rgba(76,165,115,.72), transparent 64%); }
.hero-grid { position: relative; z-index: 2; width: min(1220px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.2fr) 390px; gap: 4rem; align-items: end; min-height: calc(100vh - 204px); }
.eyebrow { display: flex; align-items: center; gap: .75rem; color: rgba(255,255,255,.72); text-transform: uppercase; font-weight: 900; letter-spacing: .14em; font-size: .78rem; }
.eyebrow span { width: 44px; height: 3px; background: var(--red); display: inline-block; }
.eyebrow.dark { color: var(--muted); }
.hero h1 { font-size: clamp(3.2rem, 8vw, 7.2rem); line-height: .92; letter-spacing: -.07em; margin: 1rem 0 1.4rem; max-width: 920px; }
.hero-lede { font-size: clamp(1.25rem, 2.4vw, 2rem); line-height: 1.35; font-weight: 800; max-width: 780px; }
.hero-sub { max-width: 680px; color: rgba(255,255,255,.76); font-size: 1.06rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }
.btn-primary { background: var(--red); color: var(--white); }
.btn-primary:hover { background: #3f8f62; }
.btn-secondary { border: 2px solid rgba(255,255,255,.42); color: var(--white); }
.btn-secondary:hover { border-color: var(--white); background: rgba(255,255,255,.1); }
.mission-card { padding: 1.35rem; background: rgba(255,255,255,.08); border: 1px solid var(--line); backdrop-filter: blur(16px); box-shadow: 0 24px 80px rgba(0,0,0,.26); }
.card-kicker { color: var(--cyan); text-transform: uppercase; letter-spacing: .12em; font-weight: 900; font-size: .78rem; }
.mission-card h2 { font-size: 2rem; line-height: 1.05; letter-spacing: -.05em; margin: .5rem 0 1rem; }
.mission-card p:last-child { color: rgba(255,255,255,.78); }
.mission-bars { display: grid; gap: .55rem; margin: 1.4rem 0; }
.mission-bars span { width: var(--w); height: 8px; background: linear-gradient(90deg, var(--red), var(--cyan)); }

.news-strip { display: grid; grid-template-columns: repeat(3, 1fr); background: var(--black); color: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.news-strip a { padding: 1.25rem 2rem; border-right: 1px solid var(--line); display: grid; gap: .3rem; }
.news-strip span { color: rgba(255,255,255,.55); text-transform: uppercase; letter-spacing: .12em; font-size: .72rem; font-weight: 900; }
.news-strip strong { font-size: 1.05rem; }
.news-strip a:hover { background: rgba(255,255,255,.08); }

.section { padding: clamp(4.5rem, 8vw, 8rem) 0; }
.section-light { background: var(--paper); color: var(--ink); }
.section-dark { background: var(--black); color: var(--white); }
.section-heading { width: min(1120px, calc(100% - 32px)); margin: 0 auto 2.5rem; }
.section-heading h2 { font-size: clamp(2.1rem, 5vw, 4.4rem); line-height: .98; letter-spacing: -.06em; margin: .8rem 0 0; }
.feature-grid, .story-layout, .footer-grid { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: stretch; }
.visual-panel { min-height: 440px; background: radial-gradient(circle at 50% 48%, rgba(127,215,255,.26), transparent 25%), linear-gradient(145deg, #020409, #0b3d91); position: relative; overflow: hidden; }
.visual-panel::before { content: ""; position: absolute; inset: 28px; border: 1px solid rgba(255,255,255,.22); }
.orbit { position: absolute; inset: 30%; border: 2px solid rgba(255,255,255,.45); border-radius: 50%; }
.orbit-one { transform: rotate(22deg) scaleX(1.8); }
.orbit-two { transform: rotate(-34deg) scaleX(1.65); border-color: rgba(76,165,115,.65); }
.dot { position: absolute; width: 16px; height: 16px; border-radius: 50%; background: var(--white); box-shadow: 0 0 30px var(--cyan); }
.dot-one { left: 28%; top: 42%; }
.dot-two { right: 30%; bottom: 32%; background: var(--red); }
.text-panel, .story-large { background: var(--white); padding: clamp(1.6rem, 4vw, 3rem); border: 1px solid var(--line-dark); box-shadow: 0 18px 60px rgba(0,0,0,.08); }
.text-panel p, .story-large p { font-size: 1.1rem; color: #303640; }
.text-link { display: inline-flex; gap: .5rem; align-items: center; margin-top: 1rem; font-weight: 900; color: var(--blue); }
.text-link span { color: var(--red); }
.three-cards { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.research-card { background: #080808; padding: 2rem; min-height: 330px; display: flex; flex-direction: column; justify-content: space-between; }
.research-card .number { color: var(--red); font-weight: 900; }
.research-card h3 { font-size: 2rem; letter-spacing: -.05em; line-height: 1.05; }
.research-card p { color: rgba(255,255,255,.72); }
.story-large h3 { font-size: clamp(2rem, 4vw, 3.6rem); letter-spacing: -.06em; line-height: 1; margin-top: 0; }
.story-list { display: grid; gap: 1rem; }
.story-list article { background: var(--white); padding: 1.5rem; border-left: 6px solid var(--red); box-shadow: 0 18px 60px rgba(0,0,0,.06); }
.story-list span { font-weight: 900; color: var(--blue); }
.story-list p { margin-bottom: 0; color: #303640; }
.banner { padding: 7rem 0; color: var(--white); background: linear-gradient(90deg, rgba(0,0,0,.82), rgba(0,0,0,.34)), radial-gradient(circle at 68% 50%, rgba(76,165,115,.58), transparent 22%), linear-gradient(135deg, #06152e, #000); }
.banner-inner { width: min(980px, calc(100% - 32px)); margin: 0 auto; }
.banner h2 { font-size: clamp(2.4rem, 6vw, 5.4rem); line-height: .95; letter-spacing: -.07em; margin: 1rem 0; }
.banner p:not(.eyebrow) { font-size: 1.25rem; color: rgba(255,255,255,.78); max-width: 760px; }
.timeline { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.timeline div { background: var(--white); border-top: 6px solid var(--blue); padding: 1.6rem; min-height: 180px; box-shadow: 0 18px 60px rgba(0,0,0,.07); }
.timeline strong { display: block; font-size: 1.55rem; letter-spacing: -.04em; margin-bottom: .7rem; }
.timeline span { color: #303640; }
.gallery-grid { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: 1.2fr .8fr 1fr; grid-auto-rows: 220px; gap: 1rem; }
.gallery-grid div { position: relative; overflow: hidden; background: linear-gradient(145deg, rgba(11,61,145,.95), rgba(76,165,115,.48)), radial-gradient(circle at 20% 20%, rgba(255,255,255,.42), transparent 18%); }
.gallery-grid div:nth-child(1) { grid-row: span 2; }
.gallery-grid div:nth-child(4) { grid-column: span 2; }
.gallery-grid span { position: absolute; left: 1rem; bottom: 1rem; color: var(--white); font-weight: 900; font-size: 1.2rem; }
.footer { background: #000; color: var(--white); padding: 5rem 0 2rem; }
.footer h2 { font-size: clamp(2.4rem, 5vw, 4.8rem); letter-spacing: -.07em; margin: .5rem 0 0; }
.contact-list { display: grid; gap: .8rem; align-content: center; }
.contact-list a { padding: 1rem; border: 1px solid var(--line); color: rgba(255,255,255,.82); }
.contact-list a:hover { border-color: var(--red); color: var(--white); }
.copyright { width: min(1120px, calc(100% - 32px)); margin: 3rem auto 0; color: rgba(255,255,255,.45); font-size: .9rem; }

.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 920px) {
  .header-inner { grid-template-columns: auto 1fr auto; height: 72px; gap: 1rem; }
  .menu-toggle { display: block; }
  .brand { min-width: 0; }
  .brand-text small { display: none; }
  .main-nav { position: absolute; left: 0; right: 0; top: 72px; display: none; padding: 1rem 1.2rem 1.4rem; background: rgba(0,0,0,.96); border-bottom: 1px solid var(--line); }
  .main-nav.is-open { display: grid; }
  .main-nav a { padding: .65rem 0; }
  .header-cta { display: none; }
  .hero-grid, .feature-grid, .story-layout, .footer-grid { grid-template-columns: 1fr; }
  .hero-grid { align-items: start; gap: 2rem; }
  .mission-card { max-width: 520px; }
  .news-strip, .three-cards, .timeline { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; grid-auto-rows: 190px; }
  .gallery-grid div:nth-child(1), .gallery-grid div:nth-child(4) { grid-row: span 1; grid-column: span 1; }
}

@media (max-width: 560px) {
  .brand-mark { width: 48px; height: 48px; font-size: 2.85rem; }
  .brand-text strong { font-size: .86rem; }
  .hero { padding-top: 104px; }
  .hero h1 { font-size: 3.3rem; }
  .section { padding: 4rem 0; }
  .news-strip a { padding: 1rem; }
}


/* === Clean graphene moiré controls === */
:root {
  --graphene-cell: 34px;            /* smaller value = denser/smaller lattice */
  --graphene-speed: 88s;            /* keep the current preferred rotation speed */
  --graphene-twist: 2.2deg;         /* small twist angle for visible moiré */
  --graphene-static-opacity: .12;   /* static layer transparency */
  --graphene-rotating-opacity: .18; /* rotating layer transparency */
}

.brand-mark {
  font-size: 2.85rem !important;
  line-height: 1 !important;
  font-family: Georgia, 'Times New Roman', serif !important;
}
.brand-mark::after {
  content: none !important;
  display: none !important;
}

.hero {
  overflow: hidden;
}

.starfield {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: .92;
  background:
    radial-gradient(circle at 50% 42%, rgba(76,165,115,.07), transparent 31%),
    radial-gradient(circle at 76% 38%, rgba(127,215,255,.08), transparent 24%);
  mask-image: none;
  -webkit-mask-image: none;
}

.starfield::before,
.starfield::after {
  content: "";
  position: absolute;
  inset: -120vmax; /* ensure full coverage even while rotating */
  transform-origin: 50% 50%;
  background-image: url("data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20viewBox%3D%220%200%20150.000%2086.603%22%3E%3Cg%20fill%3D%22none%22%20stroke%3D%22white%22%20stroke-width%3D%221.2%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%20opacity%3D%221%22%3E%3Cpolygon%20points%3D%2250.000%2C0.000%2025.000%2C43.301%20-25.000%2C43.301%20-50.000%2C0.000%20-25.000%2C-43.301%2025.000%2C-43.301%22/%3E%3Cpolygon%20points%3D%2250.000%2C86.603%2025.000%2C129.904%20-25.000%2C129.904%20-50.000%2C86.603%20-25.000%2C43.301%2025.000%2C43.301%22/%3E%3Cpolygon%20points%3D%22125.000%2C-43.301%20100.000%2C0.000%2050.000%2C0.000%2025.000%2C-43.301%2050.000%2C-86.603%20100.000%2C-86.603%22/%3E%3Cpolygon%20points%3D%22125.000%2C43.301%20100.000%2C86.603%2050.000%2C86.603%2025.000%2C43.301%2050.000%2C0.000%20100.000%2C0.000%22/%3E%3Cpolygon%20points%3D%22125.000%2C129.904%20100.000%2C173.205%2050.000%2C173.205%2025.000%2C129.904%2050.000%2C86.603%20100.000%2C86.603%22/%3E%3Cpolygon%20points%3D%22200.000%2C0.000%20175.000%2C43.301%20125.000%2C43.301%20100.000%2C0.000%20125.000%2C-43.301%20175.000%2C-43.301%22/%3E%3Cpolygon%20points%3D%22200.000%2C86.603%20175.000%2C129.904%20125.000%2C129.904%20100.000%2C86.603%20125.000%2C43.301%20175.000%2C43.301%22/%3E%3C/g%3E%3C/svg%3E");
  background-repeat: repeat;
  background-position: 0 0;
  background-size: calc(var(--graphene-cell) * 3) calc(var(--graphene-cell) * 1.7320508);
  will-change: transform;
  filter: drop-shadow(0 0 6px rgba(127,215,255,.10));
  pointer-events: none;
}

/* Layer 1: static graphene lattice */
.starfield::before {
  opacity: var(--graphene-static-opacity);
  transform: rotate(0deg);
  animation: none;
}

/* Layer 2: rotating graphene lattice */
.starfield::after {
  opacity: var(--graphene-rotating-opacity);
  animation: grapheneMoirRotate var(--graphene-speed) linear infinite;
}

@keyframes grapheneMoirRotate {
  from {
    transform: rotate(var(--graphene-twist));
  }
  to {
    transform: rotate(calc(var(--graphene-twist) + 360deg));
  }
}


/* === Team section full-width video band === */
.team-section {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(4.5rem, 7vw, 7rem);
}

.team-section .section-heading {
  margin-bottom: 2.2rem;
}

.team-video-band {
  position: relative;
  width: 100vw;
  height: clamp(360px, 52vw, 680px);
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  overflow: hidden;
  background: none;
  box-shadow: 0 30px 90px rgba(0,0,0,.22);
}

.team-video {
  width: 90%;
  height: 100%;
  display: block;
  margin: 0 auto;
  object-fit: cover;
  object-position: center center;
}


.team-video-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0,0,0,.30), rgba(0,0,0,.03) 45%, rgba(0,0,0,.22)),
    linear-gradient(180deg, rgba(245,247,251,.08), transparent 18%, rgba(245,247,251,.16));
}

.team-content {
  margin-top: clamp(1.5rem, 3vw, 2.4rem);
}

.team-note {
  background: #0b1020;
  color: var(--white);
}

.team-note p {
  color: rgba(255,255,255,.78);
}

/* Make the team content remain visible even if the reveal script is unavailable. */
.team-section .reveal {
  opacity: 1;
  transform: none;
}

@media (max-width: 920px) {
  .team-video-band {
    height: clamp(280px, 64vw, 500px);
  }
}

@media (max-width: 500px) {
  .team-video-band {
    height: 300px;
  }
}



/* ===============================
   Photo Grid System
   用法：
   photo-grid-1  一行 1 张图，居中显示
   photo-grid-2  一行 2 张图
   photo-grid-4  一行 4 张图
================================ */

/* 通用图片容器 */
.photo-grid {
  width: min(1400px, 92vw);
  margin: 56px auto 0;
  display: grid;
  gap: 24px;
}

/* 一行一张图：居中，适合大图 */
.photo-grid-1 {
  grid-template-columns: 1fr;
  width: min(900px, 92vw);
  margin: 56px auto 0;
}

/* 一行两张图 */
.photo-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

/* 一行四张图 */
.photo-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* 通用图片样式 */
.photo-grid img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center center;
  display: block;
  border: none;
  box-shadow: none;
  background: transparent;
}

/* 单张大图更适合 16:9 */
.photo-grid-1 img {
  aspect-ratio: 16 / 9;
}

/* 2张图高度一致，同时不裁切 */
.photo-grid-2 img {
  width: 100%;
  height: 420px;
  object-fit: contain;
  object-position: center center;
  background: transparent;
}

/* 平板端适配 */
@media (max-width: 900px) {
  .photo-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .photo-grid-2 {
    grid-template-columns: 1fr;
  }

  .photo-grid-1 {
    width: min(760px, 92vw);
  }
}

/* 手机端适配 */
@media (max-width: 560px) {
  .photo-grid {
    gap: 16px;
    margin-top: 36px;
  }

  .photo-grid-4 {
    grid-template-columns: 1fr;
  }

  .photo-grid-1 {
    width: 92vw;
  }
}