*{margin:0;padding:0;box-sizing:border-box}

:root{
  --paper:#ffffff;
  --paper-2:#fff8f1;
  --paper-3:#fff1e4;
  --ink:#20242b;
  --ink-2:#5c6570;
  --ink-3:#939ca8;
  --orange:#ff7a1a;
  --orange-2:#ef6a06;
  --orange-soft:rgba(255,122,26,.1);
  --line:#eceef2;
  --line-2:#f4f0ea;
  --shadow:0 10px 34px rgba(32,36,43,.07);
  --shadow-lg:0 24px 60px rgba(255,122,26,.16);
  --radius:16px;
  --radius-sm:10px;
  --wrap:1140px;
  --head-h:68px;
}

html{scroll-behavior:smooth}

body{
  font-family:"Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.7;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
}

body.nav-open{overflow:hidden}

a{color:inherit;text-decoration:none}
ul{list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* ===== header ===== */
.site-head{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .25s;
}
.site-head.scrolled{box-shadow:0 8px 26px rgba(32,36,43,.08)}
.head-inner{
  display:flex;
  align-items:center;
  gap:28px;
  min-height:var(--head-h);
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{width:30px;height:30px}
.brand-name{font-size:18px;font-weight:800;letter-spacing:.01em}
.brand-divider{width:1px;height:18px;background:var(--line)}
.brand-sub{
  font-size:12.5px;
  font-weight:600;
  color:var(--orange);
  background:var(--orange-soft);
  border-radius:999px;
  padding:3px 10px;
}

.nav-menu{display:flex;align-items:center;gap:4px;flex:1}
.nav-menu a{
  padding:8px 14px;
  font-size:14.5px;
  font-weight:500;
  color:var(--ink-2);
  border-radius:999px;
  transition:color .2s,background .2s;
}
.nav-menu a:hover{color:var(--ink);background:var(--line-2)}
.nav-menu a.active{color:var(--orange-2);background:var(--paper-3)}

.nav-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.nav-actions .ghost-link{font-size:14px;color:var(--ink-2);transition:color .2s}
.nav-actions .ghost-link:hover{color:var(--orange)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 24px;
  border-radius:999px;
  font-size:14.5px;
  font-weight:700;
  transition:transform .2s,box-shadow .2s,background .2s,color .2s,border-color .2s;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-2px)}
.btn-orange{
  background:linear-gradient(135deg,#ff8f3d,#f2690a);
  color:#fff;
  box-shadow:0 10px 24px rgba(255,122,26,.3);
}
.btn-orange:hover{box-shadow:0 14px 32px rgba(255,122,26,.38)}
.btn-ghost{
  border:1.5px solid var(--line);
  color:var(--ink);
  background:#fff;
}
.btn-ghost:hover{border-color:var(--orange);color:var(--orange-2)}
.btn-lg{padding:17px 40px;font-size:16.5px}
.btn-sm{padding:9px 18px;font-size:13.5px}
.btn-block{width:100%}

.nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:42px;height:42px;
  border:1.5px solid var(--line);
  border-radius:12px;
  padding:0 10px;
}
.nav-toggle span{
  display:block;height:2px;background:var(--ink);border-radius:2px;
  transition:transform .25s,opacity .25s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mobile-nav{
  display:none;
  flex-direction:column;
  gap:2px;
  padding:10px 24px 24px;
  background:#fff;
  border-bottom:1px solid var(--line);
}
.mobile-nav.open{display:flex}
.mobile-nav a{
  padding:13px 14px;
  border-radius:12px;
  font-size:15px;
  color:var(--ink-2);
}
.mobile-nav a:hover{background:var(--paper-2);color:var(--ink)}
.mobile-nav .btn{margin-top:12px}

/* ===== download hero ===== */
.dl-hero{
  background:
    radial-gradient(60% 70% at 50% 0%,rgba(255,122,26,.09),transparent 70%),
    var(--paper);
  padding:76px 0 64px;
  text-align:center;
  overflow:hidden;
}
.app-icon{
  width:96px;height:96px;
  margin:0 auto 26px;
  border-radius:26px;
  background:linear-gradient(145deg,#ff8f3d,#ee6406);
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow:0 22px 44px rgba(255,122,26,.32);
}
.app-icon svg{width:52px;height:52px}
.dl-hero h1{
  font-size:clamp(30px,4vw,46px);
  font-weight:900;
  letter-spacing:-.015em;
  line-height:1.25;
  margin-bottom:16px;
}
.dl-hero h1 .hl{color:var(--orange)}
.dl-hero .dl-sub{
  max-width:600px;
  margin:0 auto 34px;
  color:var(--ink-2);
  font-size:16px;
}
.dl-btn-wrap{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-bottom:22px}
.dl-meta{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  flex-wrap:wrap;
  font-size:13px;
  color:var(--ink-3);
}
.dl-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--ink-3)}
.dl-meta .ver-pill{
  background:var(--paper-3);
  color:var(--orange-2);
  font-weight:700;
  border-radius:999px;
  padding:4px 12px;
  font-size:12.5px;
}

.trust-band{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:14px;
  margin-top:52px;
}
.trust-item{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px 18px;
  box-shadow:var(--shadow);
}
.trust-item b{display:block;font-size:15px;font-weight:800;margin-bottom:4px}
.trust-item span{font-size:12.5px;color:var(--ink-3)}

/* ===== section ===== */
.section{padding:80px 0}
.section.tint{background:var(--paper-2)}
.section-head{max-width:700px;margin-bottom:44px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-tag{
  display:inline-block;
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--orange);
  background:var(--orange-soft);
  border-radius:999px;
  padding:5px 14px;
  margin-bottom:16px;
}
.section-head h2{
  font-size:clamp(24px,2.7vw,33px);
  font-weight:900;
  letter-spacing:-.01em;
  margin-bottom:12px;
}
.section-head p{color:var(--ink-2)}

/* ===== feature cards ===== */
.func-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.func-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:30px 26px;
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.func-card:hover{
  transform:translateY(-5px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(255,122,26,.3);
}
.func-card .fc-icon{
  width:46px;height:46px;
  border-radius:14px;
  background:var(--orange-soft);
  display:flex;align-items:center;justify-content:center;
  margin-bottom:20px;
}
.func-card .fc-icon svg{width:24px;height:24px}
.func-card h3{font-size:17px;font-weight:800;margin-bottom:10px}
.func-card p{font-size:14px;color:var(--ink-2)}

/* ===== steps ===== */
.step-flow{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
  counter-reset:step;
  position:relative;
}
.step-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:30px 26px;
  text-align:center;
  position:relative;
}
.step-card::before{
  counter-increment:step;
  content:counter(step);
  display:flex;
  align-items:center;
  justify-content:center;
  width:46px;height:46px;
  margin:0 auto 18px;
  border-radius:50%;
  background:linear-gradient(135deg,#ff8f3d,#f2690a);
  color:#fff;
  font-size:19px;
  font-weight:900;
  box-shadow:0 10px 22px rgba(255,122,26,.3);
}
.step-card h3{font-size:16.5px;font-weight:800;margin-bottom:8px}
.step-card p{font-size:14px;color:var(--ink-2)}

/* ===== quotes ===== */
.quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.quote-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px 26px;
}
.quote-card .stars{color:var(--orange);font-size:14px;letter-spacing:2px;margin-bottom:14px}
.quote-card p{font-size:14.5px;color:var(--ink-2);margin-bottom:18px}
.quote-card .who{display:flex;align-items:center;gap:10px}
.quote-card .avatar{
  width:34px;height:34px;
  border-radius:50%;
  background:var(--paper-3);
  color:var(--orange-2);
  display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:800;
}
.quote-card .who span{font-size:13px;color:var(--ink-3)}

/* ===== faq (details) ===== */
.faq-list{display:grid;gap:12px;max-width:820px;margin:0 auto}
.faq-item{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  overflow:hidden;
  transition:border-color .2s,box-shadow .2s;
}
.faq-item[open]{
  border-color:rgba(255,122,26,.35);
  box-shadow:0 12px 30px rgba(255,122,26,.08);
}
.faq-item summary{
  list-style:none;
  cursor:pointer;
  padding:19px 24px;
  font-size:15.5px;
  font-weight:700;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";
  flex-shrink:0;
  width:26px;height:26px;
  border-radius:50%;
  background:var(--paper-3);
  color:var(--orange-2);
  display:flex;align-items:center;justify-content:center;
  font-size:16px;
  font-weight:700;
  transition:transform .25s,background .25s;
}
.faq-item[open] summary::after{
  content:"−";
  transform:rotate(180deg);
  background:var(--orange);
  color:#fff;
}
.faq-body{
  padding:0 24px 22px;
  color:var(--ink-2);
  font-size:14.5px;
}

/* ===== page head ===== */
.page-head{
  background:
    radial-gradient(55% 80% at 50% 0%,rgba(255,122,26,.08),transparent 70%),
    var(--paper);
  padding:58px 0 48px;
  text-align:center;
  border-bottom:1px solid var(--line-2);
}
.crumb{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-size:12.5px;
  color:var(--ink-3);
  margin-bottom:18px;
}
.crumb a{color:var(--ink-2);transition:color .2s}
.crumb a:hover{color:var(--orange)}
.page-head h1{
  font-size:clamp(27px,3.2vw,38px);
  font-weight:900;
  letter-spacing:-.01em;
  margin-bottom:12px;
}
.page-head .sub{color:var(--ink-2);max-width:620px;margin:0 auto}

/* ===== download panel ===== */
.dl-panel{
  max-width:760px;
  margin:0 auto;
  background:#fff;
  border:1px solid var(--line);
  border-radius:22px;
  box-shadow:var(--shadow-lg);
  padding:46px 44px;
  text-align:center;
}
.dl-panel .app-icon{
  width:78px;height:78px;
  border-radius:21px;
  margin-bottom:20px;
}
.dl-panel .app-icon svg{width:42px;height:42px}
.dl-panel h2{font-size:23px;font-weight:900;margin-bottom:8px}
.dl-panel .panel-sub{color:var(--ink-2);font-size:14.5px;margin-bottom:28px}
.dl-panel .dl-meta{margin-top:20px}
.dl-verify{
  margin-top:30px;
  padding-top:26px;
  border-top:1px dashed var(--line);
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
  text-align:left;
}
.dl-verify .v-item b{display:block;font-size:13px;margin-bottom:3px}
.dl-verify .v-item span{
  font-size:12px;
  color:var(--ink-3);
  word-break:break-all;
}

/* ===== version table ===== */
.ver-panel{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow);
}
.ver-table{width:100%;border-collapse:collapse;min-width:620px}
.table-scroll{overflow-x:auto}
.ver-table th{
  text-align:left;
  font-size:12.5px;
  font-weight:700;
  color:var(--ink-3);
  padding:15px 22px;
  background:var(--paper-2);
  border-bottom:1px solid var(--line);
}
.ver-table td{
  padding:16px 22px;
  border-bottom:1px solid var(--line-2);
  font-size:14px;
}
.ver-table tr:last-child td{border-bottom:0}
.ver-table tr:hover td{background:var(--paper-2)}
.ver-table .v-tag{
  display:inline-block;
  font-size:12px;
  font-weight:700;
  color:var(--orange-2);
  background:var(--paper-3);
  border-radius:999px;
  padding:3px 11px;
}
.ver-table .v-tag.latest{background:var(--orange);color:#fff}

/* ===== guide blocks ===== */
.guide-wrap{max-width:820px;margin:0 auto}
.guide-block{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:34px 36px;
  margin-bottom:20px;
}
.guide-block h2{
  font-size:19px;
  font-weight:900;
  margin-bottom:6px;
  display:flex;
  align-items:center;
  gap:12px;
}
.guide-block h2 .g-num{
  flex-shrink:0;
  width:34px;height:34px;
  border-radius:10px;
  background:var(--paper-3);
  color:var(--orange-2);
  display:flex;align-items:center;justify-content:center;
  font-size:15px;
  font-weight:900;
}
.guide-block .g-intro{color:var(--ink-2);font-size:14px;margin-bottom:20px}
.guide-wrap .g-center{text-align:center;margin-top:36px}
.guide-block ul{display:grid;gap:12px}
.guide-block li{
  display:flex;
  gap:12px;
  font-size:14.5px;
  color:var(--ink-2);
}
.guide-block li::before{
  content:"";
  flex-shrink:0;
  width:7px;height:7px;
  margin-top:9px;
  border-radius:50%;
  background:var(--orange);
}
.guide-block li b{color:var(--ink)}

.note-strip{
  background:var(--paper-3);
  border-left:4px solid var(--orange);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:18px 22px;
  font-size:14px;
  color:var(--ink-2);
  margin-top:8px;
}

/* ===== help channels ===== */
.help-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.help-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px 26px;
  text-align:center;
  transition:transform .25s,box-shadow .25s;
}
.help-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.help-card .hc-icon{
  width:48px;height:48px;
  margin:0 auto 16px;
  border-radius:14px;
  background:var(--orange-soft);
  display:flex;align-items:center;justify-content:center;
}
.help-card .hc-icon svg{width:24px;height:24px}
.help-card h3{font-size:16px;font-weight:800;margin-bottom:8px}
.help-card p{font-size:13.5px;color:var(--ink-2);margin-bottom:14px}
.help-card a{font-size:14px;font-weight:700;color:var(--orange-2)}
.help-card a:hover{color:var(--orange)}

/* ===== cta ===== */
.cta-band{
  background:linear-gradient(135deg,#ff8f3d,#f2690a);
  border-radius:24px;
  padding:60px 48px;
  text-align:center;
  color:#fff;
  position:relative;
  overflow:hidden;
}
.cta-band::before{
  content:"";
  position:absolute;
  left:-80px;top:-80px;
  width:260px;height:260px;
  border-radius:50%;
  background:rgba(255,255,255,.12);
}
.cta-band::after{
  content:"";
  position:absolute;
  right:-60px;bottom:-90px;
  width:230px;height:230px;
  border-radius:50%;
  background:rgba(255,255,255,.1);
}
.cta-band h2{
  font-size:clamp(23px,2.6vw,32px);
  font-weight:900;
  margin-bottom:12px;
  position:relative;
}
.cta-band p{
  opacity:.92;
  max-width:560px;
  margin:0 auto 28px;
  position:relative;
}
.cta-band .btn{
  background:#fff;
  color:var(--orange-2);
  position:relative;
  box-shadow:0 14px 32px rgba(0,0,0,.16);
}
.cta-band .btn:hover{box-shadow:0 18px 40px rgba(0,0,0,.22)}

/* ===== footer ===== */
.site-footer{
  background:var(--paper-2);
  border-top:1px solid var(--line);
  padding:60px 0 30px;
}
.footer-cols{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:44px;
  border-bottom:1px solid var(--line);
}
.footer-brand .brand{margin-bottom:16px}
.footer-brand p{font-size:13.5px;color:var(--ink-3);max-width:300px}
.footer-col h3{font-size:13.5px;font-weight:800;margin-bottom:16px}
.footer-col a{
  display:block;
  font-size:13.5px;
  color:var(--ink-2);
  padding:5px 0;
  transition:color .2s;
}
.footer-col a:hover{color:var(--orange-2)}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  padding-top:24px;
  font-size:13px;
  color:var(--ink-3);
}

/* ===== motion ===== */
body.js .fade-up{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease,transform .6s ease;
}
body.js .fade-up.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  body.js .fade-up{opacity:1;transform:none;transition:none}
}

/* ===== responsive ===== */
@media (max-width:992px){
  .nav-menu,.nav-actions{display:none}
  .nav-toggle{display:flex;margin-left:auto}
  .func-grid,.quote-grid,.help-grid{grid-template-columns:1fr 1fr}
  .step-flow{grid-template-columns:1fr;max-width:460px;margin:0 auto}
  .trust-band{grid-template-columns:1fr 1fr}
  .footer-cols{grid-template-columns:1fr 1fr;gap:32px}
  .dl-verify{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .section{padding:60px 0}
  .dl-hero{padding:56px 0 48px}
  .func-grid,.quote-grid,.help-grid{grid-template-columns:1fr}
  .dl-panel{padding:36px 26px}
  .guide-block{padding:28px 24px}
  .cta-band{padding:46px 26px}
}
@media (max-width:560px){
  .wrap{padding:0 18px}
  .trust-band{grid-template-columns:1fr}
  .dl-verify{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr;gap:28px}
  .btn-lg{padding:15px 30px;font-size:15.5px;width:100%}
  .dl-meta{flex-direction:column;gap:6px}
  .dl-meta .dot{display:none}
}