:root{
  --bg:#f7f9fc;
  --card:#ffffff;
  --text:#172033;
  --muted:#667085;
  --line:#e8edf5;
  --primary:#2f7cf6;
  --primary-dark:#1f67da;
  --soft:#edf5ff;
  --warn:#fff8e8;
  --warn-line:#f4d487;
  --shadow:0 16px 50px rgba(33,72,131,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
}
a{color:inherit;text-decoration:none}
.container{width:min(1120px,calc(100% - 40px));margin:0 auto}
.site-header{
  position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.93);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)
}
.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:30px}
.brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:750}
.brand img{display:block}
nav{display:flex;gap:28px;color:#475467;font-size:14px}
nav a:hover{color:var(--primary)}
.hero{
  padding:76px 0;
  background:
    radial-gradient(circle at 15% 25%, rgba(47,124,246,.18), transparent 34%),
    linear-gradient(180deg,#f7fbff 0%,#f7f9fc 100%);
}
.hero-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:72px;align-items:center}
.eyebrow{
  display:inline-block;
  font-size:13px;font-weight:750;letter-spacing:.08em;
  color:var(--primary);text-transform:uppercase;margin-bottom:12px
}
h1{font-size:52px;line-height:1.13;margin:0 0 18px;letter-spacing:-.03em}
h2{font-size:34px;line-height:1.25;margin:0 0 12px;letter-spacing:-.02em}
h3{font-size:20px;margin:10px 0 8px}
.lead{font-size:19px;color:var(--muted);max-width:720px;margin:0}
.hero-actions{display:flex;gap:14px;margin-top:30px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:0 20px;border-radius:12px;
  font-weight:700;font-size:15px;border:1px solid transparent;
  transition:.2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 24px rgba(47,124,246,.22)}
.btn-primary:hover{background:var(--primary-dark)}
.btn-secondary{background:#fff;border-color:#d9e1ee;color:#344054}
.full{width:100%}
.trust-row{display:flex;flex-wrap:wrap;gap:18px;margin-top:24px;color:#667085;font-size:13px}
.qr-card{
  background:#fff;border:1px solid var(--line);border-radius:24px;
  padding:26px;text-align:center;box-shadow:var(--shadow)
}
.qr-card img{max-width:100%;height:auto;border-radius:16px}
.qr-title{font-weight:700;margin-top:10px}
.qr-domain{font-size:12px;color:var(--muted);margin-top:4px;word-break:break-all}
.section{padding:78px 0}
.section.alt{background:#fff}
.section-heading{text-align:center;max-width:760px;margin:0 auto 36px}
.section-heading.left{text-align:left;margin-left:0}
.section-heading p{color:var(--muted);margin:0}
.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.download-card{
  background:#fff;border:1px solid var(--line);border-radius:20px;
  padding:28px;box-shadow:0 10px 32px rgba(33,72,131,.06)
}
.download-card p{color:var(--muted);min-height:54px}
.platform-icon{
  width:52px;height:52px;border-radius:16px;
  display:grid;place-items:center;font-weight:800;font-size:24px
}
.platform-icon.apple{background:#111;color:#fff}
.platform-icon.android{background:#eaf8ef;color:#1f8a4c}
.platform-icon.old{background:#f1f3f6;color:#667085}
.meta{font-size:12px;color:#98a2b3;text-align:center;margin-top:10px}
.notice{
  margin-top:24px;padding:16px 18px;border-radius:14px;
  background:var(--warn);border:1px solid var(--warn-line);color:#6b5420
}
code{background:rgba(255,255,255,.8);padding:2px 6px;border-radius:6px}
.info-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.info-grid p{color:#475467}
.security-box{
  background:var(--soft);border:1px solid #cfe1ff;border-radius:20px;padding:28px
}
.security-box ul{padding-left:20px;margin:12px 0 0}
.security-box li{margin:8px 0}
.company-card{
  display:grid;grid-template-columns:repeat(2,1fr);
  border:1px solid var(--line);background:#fff;border-radius:18px;overflow:hidden
}
.company-item{padding:24px;border-bottom:1px solid var(--line)}
.company-item:nth-child(odd){border-right:1px solid var(--line)}
.company-item:nth-last-child(-n+2){border-bottom:none}
.company-item span{display:block;color:var(--muted);font-size:13px;margin-bottom:4px}
.company-item strong{font-size:16px}
.links-row{display:flex;gap:22px;margin-top:20px;color:var(--primary);font-size:14px}
.faq details{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:18px 20px;margin-bottom:12px
}
.faq summary{font-weight:700;cursor:pointer}
.faq p{color:var(--muted);margin:12px 0 0}
.site-footer{background:#111827;color:#d0d5dd;padding:34px 0}
.footer-grid{display:flex;justify-content:space-between;gap:30px;align-items:center}
.footer-brand{font-size:20px;font-weight:800;color:#fff}
.site-footer p{margin:3px 0;font-size:13px}
.site-footer a:hover{color:#fff}
@media (max-width:860px){
  nav{display:none}
  .hero{padding:54px 0}
  .hero-grid,.info-grid{grid-template-columns:1fr;gap:34px}
  .qr-card{max-width:340px}
  h1{font-size:38px}
  h2{font-size:28px}
  .download-grid{grid-template-columns:1fr}
  .company-card{grid-template-columns:1fr}
  .company-item,.company-item:nth-child(odd){border-right:none;border-bottom:1px solid var(--line)}
  .company-item:last-child{border-bottom:none}
  .footer-grid{display:block}
  .footer-right{margin-top:18px}
}
@media (max-width:520px){
  .container{width:min(100% - 28px,1120px)}
  .nav{height:64px}
  h1{font-size:34px}
  .lead{font-size:17px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%}
  .section{padding:58px 0}
}

/* Mobile experience */
.device-tip{
  display:none;
  margin-top:10px;
  color:#98a2b3;
  font-size:12px;
}
.recommended-card{
  border-color:#b9d4ff;
  box-shadow:0 14px 38px rgba(47,124,246,.13);
  position:relative;
}
.recommended-card::before{
  content:"推荐当前设备";
  position:absolute;
  top:14px;
  right:14px;
  padding:4px 9px;
  border-radius:999px;
  background:#edf5ff;
  color:#2f7cf6;
  font-size:11px;
  font-weight:700;
}
.mobile-download-bar{display:none}

/* WeChat browser guide */
.wechat-guide[hidden]{display:none!important}
.wechat-guide{
  position:fixed;
  inset:0;
  z-index:9999;
  padding:84px 18px 28px;
  background:rgba(12,20,34,.88);
  color:#fff;
  overflow:auto;
  -webkit-overflow-scrolling:touch;
}
.wechat-guide-card{
  width:min(460px,100%);
  margin:0 auto;
  text-align:center;
  padding:28px 22px 24px;
  border:1px solid rgba(255,255,255,.16);
  border-radius:24px;
  background:rgba(255,255,255,.10);
  box-shadow:0 20px 70px rgba(0,0,0,.28);
  backdrop-filter:blur(12px);
}
.wechat-guide-icon{
  width:58px;
  height:58px;
  margin:0 auto 14px;
  border-radius:18px;
  display:grid;
  place-items:center;
  background:#fff;
  color:#2f7cf6;
  font-size:30px;
  font-weight:800;
}
.wechat-guide h2{margin:0 0 10px;color:#fff;font-size:25px}
.wechat-guide p{margin:0;color:#f2f4f7;font-size:16px;line-height:1.7}
.wechat-steps{
  margin:20px 0 16px;
  display:grid;
  gap:8px;
  text-align:left;
}
.wechat-steps span{
  padding:10px 12px;
  border-radius:12px;
  background:rgba(255,255,255,.08);
  color:#f2f4f7;
  font-size:14px;
}
.wechat-url{
  margin:16px 0 12px;
  font-size:12px;
  color:#d0d5dd;
  word-break:break-all;
}
.btn-light{background:#fff;color:#172033;border-color:#fff;width:100%}
.btn-light.copied{background:#e9fff0;color:#147a38;border-color:#e9fff0}
.wechat-arrow{
  position:fixed;
  top:16px;
  right:20px;
  width:72px;
  height:58px;
  border-top:4px solid #fff;
  border-right:4px solid #fff;
  border-radius:0 22px 0 0;
  transform:rotate(-8deg);
  opacity:.95;
}
.wechat-arrow::after{
  content:"";
  position:absolute;
  right:-6px;
  top:-7px;
  width:18px;
  height:18px;
  border-top:4px solid #fff;
  border-right:4px solid #fff;
  transform:rotate(12deg);
}
.wechat-browser{overflow:hidden}

@media (max-width:860px){
  .device-tip{display:block}
  .hero{
    padding:40px 0 34px;
    text-align:center;
  }
  .hero-grid{display:block}
  .hero-copy{max-width:620px;margin:0 auto}
  .hero .eyebrow{margin-bottom:10px}
  .hero h1{font-size:clamp(32px,8.8vw,42px)}
  .hero .lead{font-size:16px;line-height:1.75}
  .hero-actions{justify-content:center}
  .trust-row{justify-content:center;margin-top:20px}
  .qr-card{display:none}
  .download-grid{gap:14px}
  .download-card{padding:22px;border-radius:18px}
  .download-card p{min-height:0;margin-top:6px}
  .section-heading{margin-bottom:24px}
  .notice{font-size:13px;line-height:1.65}
  .info-grid{gap:24px}
  .security-box{padding:22px}
}

@media (max-width:520px){
  body.has-mobile-download-bar{padding-bottom:88px}
  .site-header{position:relative}
  .brand{font-size:18px}
  .brand img{width:38px;height:38px}
  .hero{padding:30px 0 28px}
  .hero h1{font-size:32px;margin-bottom:14px}
  .hero-actions{display:none}
  .trust-row{gap:8px 14px;font-size:12px}
  .section{padding:46px 0}
  .section h2{font-size:26px}
  .download-card{padding:20px}
  .platform-icon{width:48px;height:48px;border-radius:14px}
  .recommended-card::before{top:12px;right:12px}
  .faq details{padding:16px}
  .site-footer{padding:28px 0 104px}

  .mobile-download-bar{
    display:block;
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    z-index:100;
    padding:10px 14px calc(10px + env(safe-area-inset-bottom));
    background:rgba(255,255,255,.96);
    border-top:1px solid #e8edf5;
    box-shadow:0 -10px 30px rgba(33,72,131,.10);
    backdrop-filter:blur(14px);
  }
  .mobile-download-bar[hidden]{display:none!important}
  .mobile-download-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;max-width:560px;margin:0 auto}
  .mobile-download-copy{display:flex;flex-direction:column;min-width:0;line-height:1.35}
  .mobile-download-copy strong{font-size:15px}
  .mobile-download-copy span{font-size:11px;color:#667085}
  .mobile-download-bar .btn{min-height:44px;padding:0 18px;flex-shrink:0}

  .wechat-guide{padding-top:78px}
  .wechat-guide-card{padding:24px 18px 20px;border-radius:20px}
  .wechat-arrow{right:14px;top:12px;width:60px;height:50px}
}