* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: #fff;
  color: #000;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  min-width: 320px;
}
a { color: inherit; text-decoration: none; }
img { border: 0; max-width: 100%; display: block; }
ol, ul { list-style: none; }

.nav {
  position: fixed; left: 0; top: 0; width: 100%; z-index: 20;
  height: 60px;
  background: rgba(247,249,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #e6e6e6;
}
.nav-con {
  width: min(1200px, calc(100% - 40px));
  height: 60px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 8px; color: #111; font-size: 18px; font-weight: 700; }
.logo img { height: 32px; width: 32px; }
.nav ol { display: flex; align-items: center; }
.nav li { margin-left: 50px; line-height: 60px; font-size: 14px; }
.nav li a { color: #000; }
.nav li a:hover { opacity: .8; }
.nav li.act a { color: #1677FF; }

.section { overflow: hidden; background: #fff; }
.section1 { padding: 150px 0 70px; }
.section1 .con { width: min(910px, calc(100% - 40px)); margin: 0 auto; }
.section1 .top { text-align: center; }
.section1 h1.bold {
  font-size: 48px; font-weight: 700; margin-bottom: 22px; letter-spacing: 1px; color: #000;
}
.section1 h2.bolder {
  font-size: 20px; font-weight: 500; margin-bottom: 52px; color: #000;
}

.btn-group { display: flex; justify-content: center; gap: 90px; flex-wrap: wrap; }
.btn-item { position: relative; }
.btn { display: block; width: 204px; height: 64px; }
.btn i, .btn .pc-download, .btn .mobile-download {
  display: flex; align-items: center; justify-content: center;
  width: 100%; height: 100%;
  background: #000; color: #fff; border-radius: 8px;
}
.btn-icon { width: 28px; height: 28px; margin-right: 14px; }
.btn-text { text-align: left; font-size: 18px; line-height: 1.2; }
.mini-text { font-size: 14px; }
.mini-text.gray { color: rgba(255,255,255,.6); }
.mini-text.blue { color: #00C7FE; }

.center { position: relative; margin-top: 70px; text-align: center; }
.banner-icon {
  position: absolute; top: 18%; left: 11%;
  width: 168px; height: 168px; z-index: 2; pointer-events: none;
}
.hero-banner { width: 100%; margin: 0 auto; }

.bottom {
  display: flex; align-items: flex-end; justify-content: space-between;
  margin-top: 28px; color: #7786A3;
}
.bottom .left { text-align: left; }
.bottom .left .gray { font-size: 18px; }
.bottom .left .bold {
  font-size: 70px; line-height: 1; color: #000; margin: 18px 0 16px; font-weight: 700; text-align: left;
}
.bottom .right {
  width: 560px; text-align: right; border-top: 1px solid #979797;
  padding-top: 20px; line-height: 40px; font-size: 18px; color: #000;
}

.section2 { padding: 40px 0 80px; }
.section2 .con {
  width: min(1200px, calc(100% - 40px));
  margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.section2 .left { max-width: 560px; flex: 1; }
.section2 h1.bold {
  font-size: 64px; text-align: left; margin-bottom: 28px; color: #000; font-weight: 700;
}
.section2 h2.bolder {
  font-size: 22px; line-height: 1.6; margin-bottom: 18px; font-weight: 600; text-align: left; color: #000;
}
.section2 p.gray { color: #7786A3; font-size: 18px; line-height: 2; text-align: left; }
.image-group { margin-top: 28px; }
.image-left { width: 100%; max-width: 520px; }
.section2 .right { flex: 0 0 42%; }
.hand-banner { width: 100%; max-width: 460px; margin-left: auto; }

.section3 { padding: 70px 0 90px; text-align: center; }
.section3 .con { width: min(1000px, calc(100% - 40px)); margin: 0 auto; }
.section3 h1.bold { font-size: 56px; margin-bottom: 28px; color: #000; font-weight: 700; }
.section3 h2.bolder { font-size: 22px; font-weight: 600; line-height: 1.8; color: #000; }
.section3 .gray { color: #7786A3; margin: 18px 0 36px; font-size: 18px; }
.privacy-banner { width: min(720px, 100%); margin: 0 auto; }

.footer {
  background: #000; padding: 50px 0; color: #fff; font-size: 14px; font-weight: 300;
}
.footer-con {
  width: min(1100px, calc(100% - 40px)); margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
}
.footer a { color: #fff; }
.footer .subline { margin-top: 12px; }
.footer .links a { margin-left: 40px; font-weight: 500; text-decoration: underline; }

.sub {
  min-height: calc(100vh - 60px);
  padding: 180px 0 80px; background: #fff;
}
.sub .box {
  width: min(1000px, calc(100% - 40px)); margin: 0 auto;
  color: #333; background: #f7f8fb; border-radius: 16px; padding: 48px 40px;
}
.sub .mark {
  width: 72px; height: 72px; border-radius: 20px; margin-bottom: 28px;
  background: linear-gradient(135deg, #4cc7ff, #8b6cff);
  display: grid; place-items: center; color: #fff; font-size: 32px;
}
.sub h2 { font-size: 36px; font-weight: 500; margin-bottom: 20px; }
.sub p { font-size: 18px; line-height: 2.2; }
.sub a { color: #1677FF; }
.sub .row { margin-top: 28px; font-size: 18px; line-height: 2; }

@media (max-width: 1023px) {
  .nav li { margin-left: 16px; font-size: 13px; }
  .section1 { padding-top: 100px; }
  .section1 h1.bold { font-size: 26px; }
  .section1 h2.bolder { font-size: 15px; margin-bottom: 28px; }
  .btn-group { gap: 18px; }
  .btn { width: 160px; height: 52px; }
  .btn-text { font-size: 14px; }
  .banner-icon { width: 88px; height: 88px; left: 0; top: 6%; }
  .bottom, .section2 .con, .footer-con { display: block; }
  .bottom .left .bold { font-size: 40px; }
  .bottom .right { width: auto; text-align: left; margin-top: 18px; line-height: 1.8; }
  .section2 h1.bold, .section3 h1.bold { font-size: 32px; }
  .hand-banner { margin: 24px auto 0; }
  .sub { padding-top: 100px; }
  .sub .box { padding: 28px 18px; }
  .sub h2 { font-size: 24px; }
  .sub p, .sub .row { font-size: 16px; line-height: 1.8; }
}