:root {
  --bg: #f5f6fb;
  --panel: #fff;
  --ink: #111722;
  --muted: #667386;
  --line: rgba(29, 43, 68, .1);
  --blue: #225cff;
  --lime: #d7ff42;
  --max: 1180px;
  --shadow: 0 24px 70px rgba(40, 64, 110, .09);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.shell { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.nav {
  position: fixed;
  top: 22px;
  left: 50%;
  z-index: 30;
  transform: translateX(-50%);
  width: min(var(--max), calc(100% - 48px));
  height: 58px;
  padding: 0 14px 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid rgba(255,255,255,.76);
  border-radius: 999px;
  background: rgba(255,255,255,.72);
  backdrop-filter: blur(22px);
  box-shadow: 0 18px 60px rgba(41, 61, 101, .12);
}
.brand { display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 760; }
.brand-mark { width: 21px; height: 21px; border-radius: 7px; background: linear-gradient(135deg, var(--blue), #7ee8ff); transform: rotate(45deg); }
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a { padding: 10px 12px; border-radius: 999px; color: #334052; font-size: 12px; font-weight: 650; }
.nav-links a:hover, .nav-links a.active { background: #eef2fb; }
.nav-cta { border: 1px solid rgba(16,23,34,.18); }
.button {
  height: 44px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 760;
}
.button.primary { background: var(--blue); color: #fff; box-shadow: 0 16px 34px rgba(34,92,255,.24); }
.button.light { background: #fff; border: 1px solid var(--line); }
.hero { padding: 104px 0 52px; }
.hero-panel {
  min-height: 620px;
  border-radius: 38px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 66%, rgba(255,255,255,.86) 0 6%, rgba(255,255,255,.45) 12%, transparent 23%),
    radial-gradient(circle at 50% 16%, rgba(126,232,255,.34), transparent 32%),
    linear-gradient(180deg, #0578bb 0%, #07a9e4 54%, #43cdf8 100%);
  box-shadow: var(--shadow);
}
.hero-panel:after {
  content: "";
  position: absolute;
  left: -5%;
  right: -5%;
  bottom: -14%;
  height: 42%;
  border-radius: 999px;
  background:
    radial-gradient(ellipse at 20% 45%, #fff 0 18%, transparent 42%),
    radial-gradient(ellipse at 50% 48%, #fff 0 20%, transparent 45%),
    radial-gradient(ellipse at 78% 52%, #fff 0 16%, transparent 40%),
    linear-gradient(180deg, rgba(255,255,255,.45), #fff);
  filter: blur(10px);
  opacity: .72;
}
.hero-copy { position: relative; z-index: 4; padding-top: 74px; text-align: center; display: grid; justify-items: center; }
.kicker { margin: 0 0 16px; color: var(--blue); font-size: 12px; font-weight: 780; letter-spacing: .08em; text-transform: uppercase; }
.hero .kicker { color: rgba(255,255,255,.8); }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 760px; color: #fff; font-size: clamp(44px, 5.7vw, 78px); line-height: 1; letter-spacing: -.06em; margin-bottom: 22px; }
.hero p { max-width: 620px; color: rgba(255,255,255,.78); font-size: 15px; line-height: 1.7; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 10px; }
.hero-actions .primary { background: var(--lime); color: var(--ink); }
.hero-actions .light { background: rgba(255,255,255,.16); color: #fff; border-color: rgba(255,255,255,.24); }
.orbit { position: absolute; inset: 0; perspective: 1500px; perspective-origin: 50% 54%; }
.orbit-card {
  position: absolute;
  overflow: hidden;
  border-radius: 18px;
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(255,255,255,.72);
  box-shadow: 0 28px 70px rgba(0,58,110,.22);
  transform-style: preserve-3d;
}
.orbit-card img { width: 100%; height: 100%; object-fit: cover; }
.orbit-card span { position: absolute; left: 12px; bottom: 12px; padding: 7px 10px; border-radius: 999px; background: rgba(255,255,255,.84); color: #405067; font-size: 11px; font-weight: 760; }
.orbit-card.c { left: 39%; top: 47%; width: 250px; height: 168px; transform: rotateY(0) translateZ(118px); z-index: 7; }
.orbit-card.l1 { left: 21%; top: 49%; width: 188px; height: 132px; transform: rotateY(64deg) rotateZ(-4deg) translateZ(20px); z-index: 6; }
.orbit-card.r1 { right: 21%; top: 49%; width: 188px; height: 132px; transform: rotateY(-64deg) rotateZ(4deg) translateZ(20px); z-index: 6; }
.orbit-card.l2 { left: 9%; top: 53%; width: 154px; height: 116px; transform: rotateY(82deg) rotateZ(-7deg) translateZ(-42px); z-index: 4; }
.orbit-card.r2 { right: 9%; top: 53%; width: 154px; height: 116px; transform: rotateY(-82deg) rotateZ(7deg) translateZ(-42px); z-index: 4; }
.section { padding: 92px 0; }
.section-head { display: flex; justify-content: space-between; gap: 32px; align-items: end; margin-bottom: 28px; }
.section-head h2 { max-width: 760px; font-size: clamp(32px, 4.2vw, 58px); line-height: 1; letter-spacing: -.06em; margin: 0; }
.section-head p { max-width: 460px; color: var(--muted); line-height: 1.7; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.card { padding: 24px; border-radius: 28px; background: #fff; border: 1px solid var(--line); box-shadow: 0 16px 44px rgba(43,63,100,.055); }
.stage-card { min-height: 330px; display: flex; flex-direction: column; justify-content: space-between; }
.stage-card small { color: var(--blue); font-size: 12px; font-weight: 800; }
.stage-card h3 { font-size: 30px; line-height: 1.05; letter-spacing: -.05em; }
.stage-card p { color: var(--muted); line-height: 1.65; }
.metric { min-height: 170px; display: flex; flex-direction: column; justify-content: space-between; }
.metric b { font-size: clamp(36px, 4.4vw, 64px); line-height: .92; letter-spacing: -.07em; }
.metric span { color: var(--muted); font-size: 13px; line-height: 1.5; }
.work-card { display: grid; gap: 18px; }
.work-card img { width: 100%; height: 190px; object-fit: cover; border-radius: 20px; border: 1px solid var(--line); background: #eef4ff; }
.work-card h3 { margin-bottom: 8px; font-size: 24px; letter-spacing: -.04em; }
.work-card p { color: var(--muted); line-height: 1.65; }
.page-hero { padding: 132px 0 64px; }
.page-hero h1 { max-width: 880px; font-size: clamp(44px, 6vw, 84px); line-height: 1; letter-spacing: -.07em; margin-bottom: 22px; }
.page-hero p { max-width: 680px; color: var(--muted); line-height: 1.8; }
.timeline-line { height: 3px; border-radius: 999px; background: linear-gradient(90deg, var(--blue), #7ee8ff, var(--lime)); margin: 32px 0; }
.module-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.module-card { min-height: 260px; }
.module-card h3 { font-size: 24px; letter-spacing: -.04em; }
.module-card ul { margin: 18px 0 0; padding-left: 18px; color: var(--muted); line-height: 1.8; }
.archive-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.archive-card h3 { font-size: 26px; letter-spacing: -.04em; }
.archive-card p, .archive-card li { color: var(--muted); line-height: 1.7; }
footer { padding: 46px 0 96px; border-top: 1px solid var(--line); color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1.1fr repeat(3, 1fr); gap: 34px; }
footer b { color: var(--ink); }
footer a { display: block; margin-top: 8px; }
@media (max-width: 900px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .grid-3, .grid-4, .module-grid, .archive-grid, .footer-grid, .section-head { grid-template-columns: 1fr; display: grid; }
  .hero-panel { min-height: 660px; }
  .orbit-card.c { left: 29%; width: 200px; height: 140px; }
  .orbit-card.l1, .orbit-card.r1 { width: 150px; height: 110px; }
  .orbit-card.l2, .orbit-card.r2 { display: none; }
}