
:root{--blue:#4D8FF7;--deep:#253B73;--cyan:#54D2F3;--text:#222;--muted:#5B6A82;--soft:#8795AA;--line:rgba(77,143,247,.12);--shadow:0 16px 40px rgba(37,59,115,.10);--footer:#1B2F5B}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75}a{text-decoration:none;color:inherit}img{display:block;max-width:100%;height:auto;object-fit:contain}.container{width:min(1180px,calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:9999;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);box-shadow:0 8px 24px rgba(37,59,115,.08)}.desktop-header{height:78px;display:flex;align-items:center;gap:24px}.brand-logo{display:flex;align-items:center;flex:0 0 auto}.brand-logo img{width:138px;max-height:48px}.main-nav{display:flex;gap:4px;align-items:center;justify-content:center;flex:1;white-space:nowrap}.main-nav a{padding:9px 11px;border-radius:999px;color:var(--deep);font-size:14px}.main-nav a:hover,.main-nav a.active{background:linear-gradient(135deg,rgba(77,143,247,.10),rgba(84,210,243,.12));color:var(--blue);box-shadow:inset 0 -2px 0 var(--cyan)}.main-btn{position:relative;display:inline-flex;align-items:center;justify-content:center;overflow:hidden;isolation:isolate;background:linear-gradient(135deg,#4D8FF7 0%,#5EAEF5 48%,#54D2F3 100%);color:#fff;border-radius:999px;padding:11px 23px;font-weight:700;box-shadow:0 12px 26px rgba(77,143,247,.22);transition:.2s}.main-btn:after{content:"";position:absolute;inset:0;border-radius:inherit;border:1px solid rgba(255,255,255,.56);box-shadow:0 0 12px rgba(77,143,247,.20),0 0 18px rgba(84,210,243,.24);pointer-events:none}.main-btn:hover{transform:translateY(-1px);box-shadow:0 16px 36px rgba(77,143,247,.28)}.mobile-header{display:none}.hero-section{padding:72px 0 34px;background:radial-gradient(circle at 15% 20%,rgba(77,143,247,.12) 0%,rgba(77,143,247,0) 30%),radial-gradient(circle at 88% 18%,rgba(84,210,243,.16) 0%,rgba(84,210,243,0) 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img{width:100%;height:190px;margin-bottom:18px}.app-band{display:grid;grid-template-columns:.8fr 1.2fr;gap:40px;align-items:center;background:linear-gradient(135deg,#fff,#EEF4FF,#EEF9FF);border:1px solid var(--line);border-radius:30px;padding:34px;box-shadow:var(--shadow)}.app-band img{max-height:330px;margin:auto}.page-hero{padding:70px 0 46px;background:linear-gradient(135deg,#fff,#F7FAFF,#EEF4FF)}.page-hero p{max-width:780px;color:var(--muted);font-size:17px}.content-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:34px}.prose{font-size:16px}.prose h2{font-size:30px;color:var(--deep);margin:40px 0 12px}.prose h3{color:var(--deep);margin:28px 0 10px}.prose p{color:#344158}.side-card{position:sticky;top:108px;align-self:start}.side-card img{max-height:260px;margin:auto auto 18px}.notice{background:#EEF9FF;border-left:4px solid var(--cyan);padding:20px 22px;border-radius:0 18px 18px 0;color:#40506b}.faq-list{display:grid;gap:16px}.faq-item h3{margin:0 0 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