*{margin:0;padding:0;box-sizing:border-box}
:root{
  --yellow:#f6b900;
  --yellow-dark:#e6a900;
  --black:#111827;
  --text:#374151;
  --muted:#6b7280;
  --line:#e5e7eb;
  --soft:#f8fafc;
  --white:#fff;
  --green:#3ddc84;
}
html{scroll-behavior:smooth}
section {
  scroll-margin-top: 90px;
}
body{
  font-family:"Microsoft YaHei",Arial,sans-serif;
  color:var(--black);
  background:#fff;
  line-height:1.65;
}
a{text-decoration:none;color:inherit}
.container{width:min(1180px,calc(100% - 36px));margin:0 auto}

/* Header */
.header{
  height:70px;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);
  position:sticky;
  top:0;
  z-index:99;
  backdrop-filter:blur(8px);
}
.header-inner{
  height:70px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  font-size:23px;
  font-weight:900;
  white-space:nowrap;
}
.logo-mark{
  width:34px;
  height:34px;
  position:relative;
  transform:rotate(45deg);
  flex:0 0 auto;
}
.logo-mark i{
  position:absolute;
  width:10px;
  height:10px;
  background:var(--yellow);
}
.logo-mark i:nth-child(1){left:12px;top:0}
.logo-mark i:nth-child(2){left:0;top:12px}
.logo-mark i:nth-child(3){left:12px;top:12px}
.logo-mark i:nth-child(4){left:24px;top:12px}
.logo-mark i:nth-child(5){left:12px;top:24px}
.nav{
  display:flex;
  align-items:center;
  gap:28px;
  font-size:15px;
  font-weight:700;
  color:#374151;
}
.nav a{
  height:70px;
  display:flex;
  align-items:center;
  border-bottom:3px solid transparent;
}
.nav a:hover,.nav a.active{
  color:var(--yellow-dark);
  border-color:var(--yellow);
}

/* SVG OS Icons */
.os-icon{
  width:58px;
  height:58px;
  border-radius:18px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  box-shadow:0 10px 22px rgba(17,24,39,.12);
  flex:0 0 auto;
}
.os-icon svg{
  width:34px;
  height:34px;
  fill:currentColor;
  stroke:currentColor;
  stroke-width:3;
  stroke-linecap:round;
  stroke-linejoin:round;
}
.android-icon{
  background:linear-gradient(145deg,#3ddc84,#18a957);
  color:#fff;
}
.apple-icon{
  background:linear-gradient(145deg,#111827,#374151);
  color:#fff;
}
.web-icon{
  background:linear-gradient(145deg,#ffffff,#f3f4f6);
  color:#111827;
  border:1px solid var(--line);
}
.binance-icon{
  background:linear-gradient(145deg,#ffd321,#f6b900);
  color:#111827;
}

/* Hero */
.hero{
  position:relative;
  overflow:hidden;
  padding:48px 0 32px;
  background:
    radial-gradient(circle at 84% 24%,rgba(246,185,0,.18),transparent 28%),
    linear-gradient(135deg,#fff 0%,#fff 58%,#fff7dc 100%);
}
.hero:before{
  content:"";
  position:absolute;
  right:-90px;
  top:95px;
  width:315px;
  height:315px;
  border:42px solid rgba(246,185,0,.75);
  transform:rotate(45deg);
}
.hero-grid{
  position:relative;
  z-index:2;
  display:grid;
  grid-template-columns:1.12fr .88fr;
  gap:48px;
  align-items:center;
}
.hero-title{
  font-size:64px;
  line-height:1.08;
  font-weight:950;
  margin-bottom:18px;
  letter-spacing:.5px;
}
.hero-title span{color:var(--yellow)}
.hero-desc{
  max-width:760px;
  font-size:22px;
  color:#4b5563;
  margin-bottom:22px;
}
.hero-points{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin:22px 0;
}
.hero-points span{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid #f1d58c;
  border-radius:999px;
  background:#fffaf0;
  color:#5f4500;
  font-size:14px;
  font-weight:800;
}
.hero-note{
  color:var(--muted);
  font-size:16px;
  max-width:770px;
  margin-bottom:26px;
}
.hero-actions{
  display:flex;
  gap:16px;
  align-items:stretch;
}
.main-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:265px;
  height:64px;
  border-radius:10px;
  background:linear-gradient(180deg,#ffd321,#f6b900);
  color:#111827;
  font-size:21px;
  font-weight:950;
  box-shadow:0 10px 22px rgba(246,185,0,.25);
}
.sub-btn{
  width:148px;
  height:64px;
  border:1px solid var(--line);
  background:#fff;
  border-radius:10px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:2px;
  font-size:14px;
  font-weight:800;
  box-shadow:0 8px 18px rgba(17,24,39,.05);
}
.sub-btn .os-icon{
  width:31px;
  height:31px;
  border-radius:9px;
  box-shadow:none;
}
.sub-btn .os-icon svg{
  width:19px;
  height:19px;
}

/* Download panel */
.hero-visual {
  display: flex;
  justify-content: center;
}

.visual-card {
  width: 100%;
  max-width: 430px;
  background: rgba(255,255,255,.96);
  border: 1px solid rgba(229,231,235,.9);
  border-radius: 26px;
  padding: 24px;
  box-shadow: 0 18px 42px rgba(17,24,39,.16);
  position: relative;
  overflow: hidden;
}

.visual-card:before {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 160px;
  height: 160px;
  background: rgba(246,185,0,.12);
  border-radius: 50%;
}

.visual-card:after {
  content: "";
  position: absolute;
  left: -30px;
  bottom: -30px;
  width: 120px;
  height: 120px;
  background: rgba(246,185,0,.08);
  border-radius: 50%;
}

.visual-badge {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  background: #111827;
  color: #fff;
  font-size: 13px;
  font-weight: 900;
  margin-bottom: 18px;
}

.visual-phone {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 270px;
  margin: 0 auto 20px;
  background: #111827;
  border-radius: 34px;
  padding: 12px;
  box-shadow: 0 18px 36px rgba(17,24,39,.22);
}

.phone-top {
  width: 90px;
  height: 8px;
  border-radius: 999px;
  background: #374151;
  margin: 0 auto 12px;
}

.phone-screen {
  background: linear-gradient(180deg, #fffdf5 0%, #ffffff 100%);
  border-radius: 26px;
  min-height: 360px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 20px;
  text-align: center;
}

.binance-logo-big {
  width: 92px;
  height: 92px;
  position: relative;
  transform: rotate(45deg);
  margin-bottom: 28px;
}

.binance-logo-big .diamond {
  position: absolute;
  width: 22px;
  height: 22px;
  background: #f6b900;
}

.binance-logo-big .d1 { left: 35px; top: 0; }
.binance-logo-big .d2 { left: 0; top: 35px; }
.binance-logo-big .d3 { left: 35px; top: 35px; }
.binance-logo-big .d4 { left: 70px; top: 35px; }
.binance-logo-big .d5 { left: 35px; top: 70px; }

.phone-screen h3 {
  font-size: 30px;
  line-height: 1.2;
  font-weight: 900;
  color: #111827;
  margin-bottom: 8px;
}

.phone-screen p {
  color: #6b7280;
  font-size: 16px;
  margin-bottom: 18px;
}

.screen-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.screen-tags span {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid #f1d58c;
  background: #fffaf0;
  color: #6a4d00;
  font-size: 13px;
  font-weight: 800;
}

.visual-info {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 10px;
}

.info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 46px;
  padding: 0 14px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 12px;
}

.info-row strong {
  font-size: 14px;
  color: #111827;
}

.info-row span {
  font-size: 13px;
  color: #6b7280;
}

/* Common */
.section{padding:24px 0}
.section-title{
  text-align:center;
  font-size:28px;
  line-height:1.3;
  font-weight:950;
  margin-bottom:22px;
}
.section-title:before,.section-title:after{
  content:"";
  display:inline-block;
  width:72px;
  height:2px;
  vertical-align:middle;
  margin:0 14px;
}
.section-title:before{background:linear-gradient(90deg,transparent,var(--yellow))}
.section-title:after{background:linear-gradient(90deg,var(--yellow),transparent)}
.lead-box{
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  padding:26px 30px;
  box-shadow:0 8px 18px rgba(17,24,39,.04);
}
.lead-box p{
  color:#4b5563;
  font-size:16px;
  margin-bottom:14px;
}
.lead-box p:last-child{margin-bottom:0}

/* Version cards */
.version-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
}
.version-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:18px;
  padding:24px;
  box-shadow:0 10px 22px rgba(17,24,39,.05);
}
.version-card h3{
  font-size:21px;
  margin:12px 0 8px;
}
.version-card p{
  color:var(--muted);
  font-size:15px;
  margin-bottom:16px;
}
.card-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:42px;
  padding:0 18px;
  border-radius:999px;
  background:#111827;
  color:#fff;
  font-size:14px;
  font-weight:900;
}
.card-btn.yellow{
  background:linear-gradient(180deg,#ffd321,#f6b900);
  color:#111827;
}

/* OS Sections */
.os-section-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:22px;
}
.os-card{
  position:relative;
  overflow:hidden;
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  padding:26px;
  box-shadow:0 10px 22px rgba(17,24,39,.05);
}
.os-card:after{
  content:"";
  position:absolute;
  right:-60px;
  top:-60px;
  width:180px;
  height:180px;
  border-radius:50%;
  background:rgba(246,185,0,.12);
}
.os-card-head{
  position:relative;
  z-index:2;
  display:flex;
  align-items:center;
  gap:16px;
  margin-bottom:16px;
}
.os-card h3{
  font-size:24px;
  line-height:1.25;
}
.os-card-head p{
  color:var(--muted);
  font-size:14px;
}
.os-card-body{
  position:relative;
  z-index:2;
}
.os-card-body p{
  color:#4b5563;
  margin-bottom:14px;
}
.check-list{
  list-style:none;
  margin:15px 0 18px;
}
.check-list li{
  position:relative;
  padding-left:26px;
  color:#4b5563;
  font-size:15px;
  margin:8px 0;
}
.check-list li:before{
  content:"✓";
  position:absolute;
  left:0;
  top:0;
  color:var(--yellow-dark);
  font-weight:950;
}

/* Steps */
.step-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}
.step-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  padding:22px;
  text-align:center;
  box-shadow:0 8px 18px rgba(17,24,39,.04);
}
.step-num{
  width:30px;
  height:30px;
  border-radius:50%;
  background:var(--yellow);
  color:#fff;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-weight:950;
  margin-bottom:12px;
}
.step-card h3{
  font-size:18px;
  margin:10px 0 6px;
}
.step-card p{
  color:var(--muted);
  font-size:14px;
}

/* Features */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(6,1fr);
  gap:16px;
}
.feature-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  padding:20px 12px;
  text-align:center;
  box-shadow:0 8px 18px rgba(17,24,39,.04);
}
.feature-icon{
  font-size:34px;
  color:var(--yellow);
  margin-bottom:8px;
}
.feature-card h3{
  font-size:16px;
  margin-bottom:4px;
}
.feature-card p{
  color:var(--muted);
  font-size:13px;
}

/* Safe */
.safe-box{
  display:grid;
  grid-template-columns:190px 1fr 330px;
  gap:24px;
  align-items:center;
  border:1px solid #f1c84c;
  border-radius:20px;
  background:linear-gradient(90deg,#fffdf5,#fff);
  padding:26px 30px;
}
.shield{
  width:140px;
  height:140px;
  margin:0 auto;
  background:linear-gradient(145deg,#ffe57a,#f4ad00);
  color:#fff;
  font-size:70px;
  font-weight:950;
  display:flex;
  align-items:center;
  justify-content:center;
  clip-path:polygon(50% 0,90% 16%,82% 76%,50% 100%,18% 76%,10% 16%);
}
.safe-content h2{
  font-size:29px;
  margin-bottom:8px;
}
.safe-content p{
  color:var(--muted);
}
.safe-tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:14px;
}
.safe-tags span{
  border:1px solid #f1d58c;
  background:#fffaf0;
  color:#6a4d00;
  padding:5px 10px;
  border-radius:8px;
  font-size:13px;
  font-weight:800;
}
.safe-cta{
  border-left:1px solid var(--line);
  padding-left:24px;
  text-align:center;
}
.safe-cta .main-btn{
  min-width:0;
  width:100%;
  height:58px;
  font-size:18px;
}
.safe-cta p{
  color:var(--muted);
  margin-top:10px;
  font-size:14px;
}

/* FAQ */
.faq-grid{
  display:grid;
  grid-template-columns:1.1fr .9fr;
  gap:26px;
}
.faq-list,.tips{
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  padding:14px 18px;
}
.faq-item{
  border-bottom:1px solid var(--line);
}
.faq-item:last-child{border-bottom:0}
.faq-question{
  width:100%;
  min-height:48px;
  border:0;
  background:transparent;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  cursor:pointer;
  font-family:inherit;
  font-size:15px;
  font-weight:900;
  color:#111827;
  text-align:left;
}
.faq-question em{
  font-style:normal;
  color:var(--muted);
  transition:.25s;
}
.faq-answer{
  display:none;
  padding:0 0 15px;
  color:var(--muted);
  font-size:14px;
  line-height:1.85;
}
.faq-item.active .faq-answer{display:block}
.faq-item.active .faq-question em{
  transform:rotate(180deg);
  color:var(--yellow-dark);
}
.tips h3{
  font-size:22px;
  margin-bottom:10px;
}
.tips ul{list-style:none}
.tips li{
  position:relative;
  padding-left:28px;
  color:var(--muted);
  margin:9px 0;
  font-size:15px;
}
.tips li:before{
  content:"✓";
  position:absolute;
  left:0;
  top:0;
  color:var(--yellow-dark);
  font-weight:950;
}

/* Bottom CTA */
.bottom-cta{
  margin-top:22px;
  border:1px solid #f1c84c;
  border-radius:18px;
  background:#fffdf5;
  display:grid;
  grid-template-columns:54px 1fr 280px;
  gap:18px;
  align-items:center;
  padding:14px 24px;
}
.circle-icon{
  width:46px;
  height:46px;
  border-radius:50%;
  background:var(--yellow);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:25px;
}
.bottom-cta p{
  font-size:17px;
  font-weight:800;
  color:#374151;
}
.bottom-cta .main-btn{
  min-width:0;
  width:100%;
  height:50px;
  font-size:17px;
}
.footer {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 30px 0 18px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 46px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.footer-brand .brand {
  font-size: 24px;
  margin-bottom: 10px;
}

.footer-brand p {
  max-width: 310px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.footer-col h4 {
  font-size: 16px;
  color: #111827;
  margin-bottom: 10px;
  font-weight: 900;
}

.footer-col a {
  display: block;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
}

.footer-col a:hover {
  color: var(--yellow-dark);
}

.footer-disclaimer {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  color: #6b7280;
  font-size: 13px;
  line-height: 1.8;
}

.footer-copy {
  margin-top: 10px;
  color: #9ca3af;
  font-size: 13px;
  text-align: center;
}
/* Responsive */
@media(max-width:1080px){
  .header,.header-inner{height:auto}
  .header-inner{padding:14px 0;display:block}
  .brand{margin-bottom:10px}
  .nav{overflow-x:auto;white-space:nowrap;padding-bottom:4px}
  .nav a{height:36px}
  .hero-grid,.os-section-grid,.safe-box,.faq-grid{grid-template-columns:1fr}
  .hero-title{font-size:52px}
  .version-grid{grid-template-columns:1fr}
  .step-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(3,1fr)}
  .safe-cta{border-left:0;padding-left:0}
  .footer-top{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:760px){
  .container{width:min(100% - 24px,1180px)}
  .hero{padding:34px 0 24px}
  .hero:before{right:-160px;opacity:.35}
  .hero-title{font-size:39px}
  .hero-desc{font-size:18px}
  .hero-actions{flex-direction:column}
  .main-btn,.sub-btn{width:100%;min-width:0}
  .download-option{grid-template-columns:46px 1fr}
  .download-option .mini-link{grid-column:1 / -1;text-align:center}
  .section-title{font-size:23px}
  .section-title:before,.section-title:after{width:28px;margin:0 8px}
  .step-grid,.feature-grid,.footer-top,.bottom-cta{grid-template-columns:1fr}
  .lead-box{padding:22px 20px}
  .bottom-cta{text-align:center}
  .circle-icon{margin:0 auto}
  .footer-bottom{flex-direction:column}
}