:root {
  --bg: #f7f9fc;
  --text: #172033;
  --muted: #657086;
  --primary: #2f6bff;
  --primary-dark: #1d4fd7;
  --card: #ffffff;
  --line: rgba(23, 32, 51, 0.1);
  --shadow: 0 20px 45px rgba(22, 34, 62, 0.1);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.navbar {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; }
.brand-logo {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: white;
  background: linear-gradient(135deg, #2f6bff, #40c9ff);
  box-shadow: 0 8px 22px rgba(47, 107, 255, 0.25);
}
.brand-text { font-size: 20px; }
.nav-links { display: flex; align-items: center; gap: 28px; color: #445066; font-size: 15px; }
.nav-links a:hover { color: var(--primary); }

.hero {
  position: relative;
  padding: 98px 0 92px;
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 20%, rgba(47, 107, 255, 0.16), transparent 34%),
    radial-gradient(circle at 85% 20%, rgba(64, 201, 255, 0.18), transparent 32%),
    linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 13px;
}
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(38px, 6vw, 62px); line-height: 1.12; margin-bottom: 24px; letter-spacing: -0.04em; }
h2 { font-size: clamp(30px, 4vw, 42px); line-height: 1.22; margin-bottom: 16px; letter-spacing: -0.03em; }
h3 { margin-bottom: 12px; font-size: 21px; }
.hero-desc { color: var(--muted); font-size: 18px; max-width: 680px; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: white; background: var(--primary); box-shadow: 0 12px 24px rgba(47, 107, 255, 0.24); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: white; border: 1px solid var(--line); }

.hero-card {
  min-height: 430px;
  position: relative;
  border-radius: 36px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.8);
  overflow: hidden;
}
.hero-card::before {
  content: "";
  position: absolute;
  inset: 50px;
  border-radius: 50%;
  border: 1px dashed rgba(47, 107, 255, 0.28);
  animation: spin 18s linear infinite;
}
.center-ball {
  position: absolute;
  inset: 50%;
  transform: translate(-50%, -50%);
  width: 138px;
  height: 138px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  text-align: center;
  color: white;
  font-weight: 900;
  background: linear-gradient(135deg, #2f6bff, #31d3ff);
  box-shadow: 0 18px 42px rgba(47, 107, 255, 0.28);
}
.orbit-card {
  position: absolute;
  padding: 14px 18px;
  border-radius: 18px;
  background: white;
  box-shadow: 0 14px 35px rgba(22, 34, 62, 0.1);
  font-weight: 800;
  animation: float 4s ease-in-out infinite;
}
.card-a { top: 68px; left: 62px; }
.card-b { top: 80px; right: 54px; animation-delay: .4s; }
.card-c { bottom: 70px; left: 78px; animation-delay: .8s; }
.card-d { bottom: 82px; right: 58px; animation-delay: 1.2s; }

.section { padding: 88px 0; }
.section-title { max-width: 720px; margin: 0 auto 42px; text-align: center; }
.section-title p { color: var(--muted); }
.section-title.light h2, .section-title.light p:not(.eyebrow) { color: white; }

.business-grid, .apps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.business-grid { grid-template-columns: repeat(3, 1fr); }
.info-card, .app-card, .stat-card, .contact-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(22, 34, 62, 0.06);
}
.info-card {
  padding: 30px;
  transition: transform .25s ease, box-shadow .25s ease;
}
.info-card:hover, .app-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.icon { font-size: 30px; display: inline-block; margin-bottom: 16px; }
.info-card p, .app-card p, .muted { color: var(--muted); }

.apps-section {
  background: linear-gradient(135deg, #172033 0%, #243555 52%, #2f6bff 100%);
}
.app-card {
  padding: 28px;
  transition: transform .25s ease, box-shadow .25s ease;
}
.app-logo {
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  border-radius: 22px;
  background: rgba(47, 107, 255, 0.08);
  border: 1px solid rgba(47, 107, 255, 0.14);
  overflow: hidden;
  margin-bottom: 18px;
}
.app-logo img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}
ul { padding-left: 18px; margin-bottom: 0; color: #4e5a70; }

.advantages-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 40px; align-items: center; }
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.stat-card { padding: 28px; }
.stat-card strong { display: block; font-size: 36px; color: var(--primary); line-height: 1; margin-bottom: 10px; }
.stat-card span { color: var(--muted); font-weight: 700; }

.contact-section { padding-top: 20px; }
.contact-box { padding: 38px; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
.contact-list p { margin-bottom: 10px; color: var(--muted); }

.site-footer {
  background: #111827;
  color: rgba(255, 255, 255, 0.72);
  padding: 28px 0;
  font-size: 14px;
}
.footer-inner { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.footer-inner p { margin: 0; }
.footer-inner a:hover { color: #fff; }
.divider { margin: 0 10px; opacity: .5; }

.section-fade {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.section-fade.visible { opacity: 1; transform: translateY(0); }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (max-width: 960px) {
  .nav-links { display: none; }
  .hero-grid, .advantages-grid, .contact-box { grid-template-columns: 1fr; }
  .business-grid, .apps-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding-top: 66px; }
}

@media (max-width: 620px) {
  .container { width: min(100% - 28px, 1160px); }
  .business-grid, .apps-grid, .stats-grid { grid-template-columns: 1fr; }
  .hero-card { min-height: 360px; }
  .orbit-card { font-size: 14px; }
  .card-a { left: 30px; }
  .card-b { right: 26px; }
  .card-c { left: 34px; }
  .card-d { right: 30px; }
  .footer-inner { display: block; }
  .footer-inner p + p { margin-top: 10px; }
}