:root{
  --navy-900:#081530; --navy-800:#0a1e4a; --navy-700:#12307a; --navy-600:#1a44a8;
  --blue:#2f6bff; --cyan:#22d3ee; --ink:#1c2333;
  --muted:#5a6478; --line:#e6ebf5; --bg:#f5f7fc; --card:#ffffff;
  --radius:14px; --shadow:0 10px 30px rgba(10,30,74,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{max-width:1120px;margin:0 auto;padding:0 24px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(8,21,48,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.08)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:20px;font-weight:700;letter-spacing:.5px}
.brand svg{height:34px;width:34px;flex:none}
.brand .en{font-size:12px;font-weight:400;color:rgba(255,255,255,.55);display:block;line-height:1;letter-spacing:2px}
.main-nav{display:flex;gap:28px;align-items:center}
.main-nav a{color:rgba(255,255,255,.78);font-size:15px;transition:color .2s}
.main-nav a:hover{color:#fff}
.nav-actions{display:flex;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;border-radius:10px;font-size:15px;font-weight:600;transition:all .2s;cursor:pointer;border:none}
.btn-ghost{color:#fff;border:1px solid rgba(255,255,255,.35)}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn-cyan:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(34,211,238,.36)}
.btn-primary{background:linear-gradient(135deg,var(--blue),#5a8bff);color:#fff;box-shadow:0 6px 18px rgba(47,107,255,.35)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(47,107,255,.45)}
.btn-cyan{background:linear-gradient(135deg,var(--cyan),#38bdf8);color:#04263a;box-shadow:0 6px 18px rgba(34,211,238,.30)}
.btn-lg{padding:14px 32px;font-size:16px;border-radius:12px}

/* ---------- Hero ---------- */
.hero{position:relative;isolation:isolate;overflow:hidden;background:radial-gradient(900px 520px at 78% 42%,rgba(47,107,255,.24),transparent 62%),radial-gradient(620px 420px at 16% 2%,rgba(34,211,238,.13),transparent 68%),linear-gradient(112deg,#07132d 0%,#0a1e49 48%,#102e70 100%);color:#fff;padding:88px 0 102px}
.hero::before{content:"";position:absolute;z-index:-1;inset:0;background:repeating-linear-gradient(0deg,transparent 0 67px,rgba(255,255,255,.025) 68px),repeating-linear-gradient(90deg,transparent 0 67px,rgba(255,255,255,.025) 68px);mask-image:linear-gradient(90deg,transparent 4%,#000 54%,#000 100%);pointer-events:none}
.hero::after{content:"";position:absolute;z-index:1;inset:0;background:linear-gradient(transparent 72%,rgba(245,247,252,1) 100%);pointer-events:none}
.hero .container{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-tag{display:inline-flex;align-items:center;gap:8px;background:rgba(34,211,238,.12);border:1px solid rgba(34,211,238,.4);color:var(--cyan);font-size:13px;padding:6px 14px;border-radius:999px;margin-bottom:22px}
.hero h1{font-size:50px;line-height:1.18;font-weight:850;letter-spacing:.2px;text-wrap:balance}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--cyan),#5a8bff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{margin:22px 0 8px;font-size:17px;line-height:1.85;color:rgba(239,245,255,.76);max-width:540px}
.hero .points{display:flex;gap:18px;margin:22px 0 30px;flex-wrap:wrap}
.hero .points span{font-size:13.5px;color:rgba(255,255,255,.86);display:inline-flex;align-items:center;gap:8px}
.hero .points svg{width:16px;height:16px;stroke:var(--cyan);flex:none}
.hero-tag-dot{width:7px;height:7px;background:var(--cyan);border-radius:50%;box-shadow:0 0 12px rgba(34,211,238,.8)}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}

/* hero mock pay card */
.pay-mock{position:relative}
.pay-card{position:relative;overflow:hidden;background:linear-gradient(145deg,rgba(22,49,107,.98),rgba(8,24,59,.99));border:1px solid rgba(172,207,255,.22);border-radius:22px;padding:30px;box-shadow:0 34px 80px rgba(0,0,0,.42),inset 0 1px 0 rgba(255,255,255,.1);animation:float 7s ease-in-out infinite}
.pay-card::before{content:"";position:absolute;right:-90px;top:-130px;width:270px;height:270px;border-radius:50%;background:radial-gradient(circle,rgba(34,211,238,.19),transparent 68%);pointer-events:none}
.pay-card>*{position:relative;z-index:1}
.pay-card .row1{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}
.pay-card .amount{font-size:34px;font-weight:800;letter-spacing:1px}
.pay-card .amount small{font-size:15px;color:rgba(255,255,255,.6);font-weight:400;margin-right:4px}
.pay-card .qr{width:132px;height:132px;margin:0 auto;background:#fff;border-radius:12px;display:grid;place-items:center;color:#0a1e4a;font-size:12px;text-align:center}
.pay-card .qr svg{width:92px;height:92px}
.pay-card .paytabs{display:flex;gap:10px;margin-top:20px;margin-bottom:16px}
.pay-card .paytabs span,.pay-card .paytabs button{flex:1;text-align:center;font:inherit;font-size:13px;padding:9px 8px;border:0;border-radius:8px;background:rgba(255,255,255,.08);color:rgba(255,255,255,.75)}
.pay-card .paytabs button{cursor:pointer;transition:background .2s,color .2s}
.pay-card .paytabs span.on,.pay-card .paytabs button.on{background:linear-gradient(135deg,var(--blue),#5a8bff);color:#fff}
.pay-card .paytabs button:focus-visible,.btn:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}

/* ---------- generic section ---------- */
.section{padding:88px 0}
.section.alt{background:linear-gradient(180deg,#fff 0%,#f8faff 100%);border-top:1px solid rgba(230,235,245,.75);border-bottom:1px solid rgba(230,235,245,.75)}
.sec-head{text-align:center;max-width:640px;margin:0 auto 52px}
.sec-head h2{font-size:30px;font-weight:800;letter-spacing:1px}
.sec-head p{color:var(--muted);margin-top:12px}
.sec-head .bar{width:44px;height:4px;border-radius:4px;background:linear-gradient(90deg,var(--blue),var(--cyan));margin:0 auto 18px}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:-58px;position:relative;z-index:3}
.stat{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 18px;text-align:center}
.stat b{display:block;font-size:30px;font-weight:800;background:linear-gradient(90deg,var(--navy-700),var(--blue));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:13.5px;color:var(--muted)}

/* feature cards */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.card .ico{width:50px;height:50px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(47,107,255,.14),rgba(34,211,238,.16));margin-bottom:18px}
.card .ico svg{width:24px;height:24px;stroke:var(--blue)}
.card h3{font-size:17px;margin-bottom:10px}
.card p{font-size:14px;color:var(--muted)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.step{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px 26px}
.step::before{counter-increment:step;content:"0" counter(step);font-size:15px;font-weight:800;color:var(--blue);display:inline-block;background:rgba(47,107,255,.1);padding:4px 12px;border-radius:999px;margin-bottom:16px}
.step h3{font-size:16px;margin-bottom:8px}
.step p{font-size:13.5px;color:var(--muted)}
.step::after{content:"→";position:absolute;right:-19px;top:50%;transform:translateY(-50%);color:#b9c6e8;font-size:18px;z-index:2}
.step:last-child::after{content:""}

/* channels strip */
.channels{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.channels span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:10px 22px;font-size:14.5px;font-weight:600;color:var(--navy-800);display:inline-flex;align-items:center;gap:8px;transition:all .2s}
.channels span:hover{border-color:var(--blue);color:var(--blue);box-shadow:0 6px 16px rgba(47,107,255,.12)}
.channels i{width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--cyan))}

/* CTA band */
.closing-section{padding:72px 0 24px}
.cta-band{position:relative;overflow:hidden;background:radial-gradient(420px 260px at 88% 8%,rgba(34,211,238,.2),transparent 68%),linear-gradient(118deg,#091a3e 0%,#12377e 58%,#1a4cae 100%);border:1px solid rgba(255,255,255,.14);border-radius:22px;padding:50px 54px;color:#fff;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;box-shadow:0 24px 56px rgba(10,30,74,.24)}
.cta-band h2{font-size:26px;font-weight:800}
.cta-band p{color:rgba(255,255,255,.7);margin-top:8px}

/* ---------- footer ---------- */
.site-footer{background:var(--navy-900);color:rgba(255,255,255,.66);padding:60px 0 28px;margin-top:84px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:32px}
.site-footer h5{color:#fff;font-size:15px;margin-bottom:16px}
.site-footer a{display:block;font-size:13.5px;padding:4px 0;transition:color .2s}
.site-footer a:hover{color:#fff}
.foot-brand p{font-size:13.5px;margin-top:12px;max-width:280px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:44px;padding-top:22px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.5px;color:rgba(255,255,255,.4)}
.foot-contact p{font-size:13.5px;padding:4px 0;display:flex;align-items:center;gap:8px}
.foot-contact svg{width:15px;height:15px;stroke:var(--cyan);flex:none}

/* content pages (about/agreement/intro) */
.page-body{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:48px;max-width:900px;margin:48px auto}
.page-body h1{font-size:26px;margin-bottom:22px;padding-bottom:14px;border-bottom:2px solid var(--line)}
.page-body h3{font-size:17px;margin:22px 0 10px;color:var(--navy-800)}
.page-body p,.page-body li{font-size:14.5px;color:#3a4358;margin-bottom:10px}
.page-body ul{padding-left:20px}

/* hero 两栏弹性布局（文案 + 演示卡） */
.hero-flex{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}

/* 演示支付卡片 */
.demo-card .row1{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.dc-title{color:#fff;font-size:15px;font-weight:700}
.dc-live{color:var(--cyan);font-size:12px}
.dc-amount{display:flex;align-items:baseline;gap:6px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:12px;padding:14px 18px;margin-bottom:14px}
.dc-amount>span{color:rgba(255,255,255,.6);font-size:18px}
.dc-amount input{flex:1;background:none;border:none;outline:none;color:#fff;font-size:30px;font-weight:800;letter-spacing:1px;min-width:0;width:100%}
.dc-amount:focus-within{border-color:rgba(34,211,238,.75);box-shadow:0 0 0 3px rgba(34,211,238,.13)}
.dc-amount input::-webkit-outer-spin-button,.dc-amount input::-webkit-inner-spin-button{-webkit-appearance:none}
.dc-submit{width:100%;padding:14px 0;font-size:16px;border-radius:12px}
.dc-result{display:flex;gap:10px;align-items:flex-start;background:rgba(18,183,106,.12);border:1px solid rgba(18,183,106,.4);border-radius:12px;padding:14px 16px;margin-top:14px;animation:pop .35s ease}
.dc-result[hidden]{display:none}
.dc-result svg{width:26px;height:26px;flex:none;margin-top:2px}
.dc-result b{color:#d9fbe9;font-size:14px;display:block}
.dc-result p{color:rgba(255,255,255,.75);font-size:12.5px;margin-top:4px}
@keyframes pop{from{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}
.dc-note{margin-top:14px;font-size:11.5px;line-height:1.7;color:rgba(255,255,255,.45)}
.dc-note code{background:rgba(255,255,255,.1);padding:1px 6px;border-radius:5px;color:#9cc4ff;font-size:11px}

/* 三个徽章行（系统可用性 / 挂机需求 / 全天候监控） */
.proof-section{position:relative;z-index:4;padding:0 0 30px;margin-top:-38px}
.badge-row{display:grid;grid-template-columns:repeat(3,1fr);max-width:940px;margin:0 auto;background:rgba(255,255,255,.96);border:1px solid rgba(213,222,239,.92);border-radius:18px;box-shadow:0 22px 54px rgba(17,43,91,.12);overflow:hidden;backdrop-filter:blur(14px)}
.badge-item{position:relative;text-align:left;padding:22px 34px;display:flex;flex-direction:column;justify-content:center;gap:4px}
.badge-item+.badge-item::before{content:"";position:absolute;left:0;top:22%;height:56%;width:1px;background:var(--line)}
.badge-item b{display:block;font-size:18px;font-weight:800;color:var(--navy-800);letter-spacing:.1px}
.badge-item span{font-size:12.5px;color:var(--muted)}

/* 四卖点行 */
.sell-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:36px;padding:12px;background:rgba(239,244,253,.78);border:1px solid #e7edf8;border-radius:16px}
.sell{display:flex;align-items:center;justify-content:center;gap:10px;background:#fff;border:1px solid rgba(224,232,246,.8);border-radius:12px;padding:13px 10px;font-size:14px;font-weight:700;color:var(--navy-800);transition:all .2s}
.sell:hover{border-color:var(--blue);box-shadow:0 8px 20px rgba(47,107,255,.12);transform:translateY(-2px)}
.sell-ico{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,rgba(47,107,255,.14),rgba(34,211,238,.18));flex:none}
.sell-ico svg{width:15px;height:15px;stroke:var(--blue)}

/* reveal animation */
.reveal{opacity:0;transform:translateY(22px);transition:all .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
}