@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700&family=Inter:wght@400;500;600&display=swap');
:root{--ink:#0b0b0b;--panel:#151515;--paper:#f0eee8;--orange:#f05a2a;--muted:#88847d}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--ink);color:var(--paper);font-family:Inter,"PingFang SC",sans-serif}a{color:inherit;text-decoration:none}button{font:inherit}.grain{position:fixed;inset:0;z-index:20;pointer-events:none;opacity:.03;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}.site-header{height:82px;display:flex;align-items:center;padding:0 clamp(22px,5vw,76px);border-bottom:1px solid #292929}.brand{display:flex;align-items:center;gap:11px;font:700 21px "Noto Serif SC",serif}.brand img{width:34px;height:34px;border-radius:8px}.site-header nav{margin-left:auto;display:flex;gap:35px;color:#aaa;font-size:12px}.site-header nav a:hover,.site-header nav a.active{color:var(--orange)}.back-home{margin-left:34px;padding:11px 16px;border:1px solid #444;font-size:11px}.page-hero{min-height:390px;padding:95px clamp(24px,12vw,190px) 75px;display:flex;align-items:end;background:linear-gradient(90deg,rgba(0,0,0,.92),rgba(0,0,0,.42)),url('https://images.unsplash.com/photo-1489599849927-2ee91cede3ba?auto=format&fit=crop&w=2000&q=85') center/cover}.page-hero .eyebrow,.eyebrow{color:var(--orange);font-size:10px;letter-spacing:2.5px}.page-hero h1{margin:13px 0 15px;font:600 clamp(48px,7vw,86px)/1.1 "Noto Serif SC",serif}.page-hero p:last-child{max-width:620px;color:#aaa;line-height:1.8}.document{width:min(900px,calc(100% - 44px));margin:auto;padding:90px 0 130px;font-family:"Noto Serif SC",serif}.document .meta{display:flex;gap:30px;padding-bottom:30px;border-bottom:1px solid #292929;color:#777;font:10px Inter,sans-serif;letter-spacing:1px}.document section{padding:38px 0;border-bottom:1px solid #242424}.document h2{margin:0 0 18px;font-size:25px}.document h2 span{display:inline-block;width:34px;color:var(--orange);font:11px Inter,sans-serif}.document h3{margin:25px 0 10px;font-size:17px}.document p,.document li{color:#aaa69f;font-size:14px;line-height:2}.document ul{padding-left:22px}.document a{color:#db7a59;text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere}.sdk-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:25px}.sdk-card{padding:24px;background:#141414;border:1px solid #292929}.sdk-card h3{margin:0 0 14px;color:white}.sdk-card p{margin:5px 0;font-size:12px;line-height:1.75}.sdk-card strong{color:#ddd}.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-top:30px}.contact-card{min-height:210px;padding:28px;background:#151515;border:1px solid #292929}.contact-card span{color:var(--orange);font-size:10px}.contact-card h2{font-size:21px;margin:28px 0 8px}.contact-card p{color:#777;line-height:1.8;font-size:12px}.contact-card a{display:inline-block;margin-top:12px;color:#eee;border-bottom:1px solid #555;padding-bottom:4px}.company-block{margin-top:50px;padding:38px;background:#e8e5dd;color:#111}.company-block h2{font-family:"Noto Serif SC",serif}.company-block p{color:#666;line-height:1.9;font-size:13px}.download-stage{min-height:calc(100vh - 82px);display:grid;grid-template-columns:1fr 1fr;align-items:center;padding:70px clamp(24px,9vw,140px);overflow:hidden}.download-copy h1{font:600 clamp(52px,7vw,94px)/1.1 "Noto Serif SC",serif;margin:16px 0}.download-copy>p{max-width:470px;color:#888;line-height:1.9}.download-btn{display:inline-flex;align-items:center;gap:15px;margin-top:25px;padding:16px 23px;border:0;background:var(--orange);color:white;cursor:pointer}.download-btn span{font-size:20px}.download-note{display:block;height:22px;margin-top:15px;color:#8f8b84;font-size:11px}.download-visual{position:relative;height:560px}.download-visual img{position:absolute;width:275px;height:540px;object-fit:cover;object-position:top;border:8px solid #171717;border-radius:40px;box-shadow:0 30px 80px #000}.download-visual img:first-child{left:5%;top:45px;transform:rotate(-8deg);opacity:.65}.download-visual img:last-child{left:35%;top:0;transform:rotate(4deg)}.site-footer{padding:42px clamp(22px,5vw,76px);display:flex;align-items:center;justify-content:space-between;border-top:1px solid #252525;color:#666;font-size:10px}.footer-links{display:flex;gap:26px}.reveal{opacity:0;transform:translateY(20px);transition:.7s}.reveal.visible{opacity:1;transform:none}.wechat-tip{position:fixed;z-index:40;inset:0;display:none;place-items:center;padding:20px;background:rgba(0,0,0,.9)}.wechat-tip.open{display:grid}.wechat-box{position:relative;max-width:440px;padding:45px;background:#efede6;color:#111;text-align:center}.wechat-box button{position:absolute;top:12px;right:15px;border:0;background:none;font-size:27px;cursor:pointer}
@media(max-width:760px){.site-header{height:70px}.site-header nav{display:none}.back-home{margin-left:auto}.page-hero{min-height:330px;padding:80px 24px 55px}.document{padding:65px 0 90px}.document .meta{flex-direction:column;gap:8px}.sdk-grid,.contact-grid{grid-template-columns:1fr}.download-stage{grid-template-columns:1fr;padding:75px 24px 0}.download-visual{height:480px;margin-top:35px}.download-visual img{width:205px;height:410px;border-radius:30px}.download-visual img:last-child{left:38%}.site-footer{align-items:flex-start;flex-direction:column;gap:24px}.footer-links{flex-wrap:wrap}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}.reveal{opacity:1;transform:none}}

.platform-actions{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}.platform-btn{position:relative;width:190px;min-height:62px;display:flex;align-items:center;gap:13px;padding:10px 16px;border:1px solid #454545;background:#121212;color:white;text-align:left;cursor:pointer;transition:transform .25s,border-color .25s,background .25s}.platform-btn:hover{transform:translateY(-3px);border-color:var(--orange);background:#181818}.platform-btn:disabled{cursor:wait;opacity:.58;transform:none}.platform-btn small{display:block;color:#777;font-size:8px}.platform-symbol{width:25px;text-align:center;color:var(--orange);font-size:20px}.platform-btn em{position:absolute;right:8px;top:7px;color:var(--orange);font:normal 8px Inter,sans-serif;letter-spacing:1px}.wechat-box .eyebrow{margin:0}.wechat-box h2{font-family:"Noto Serif SC",serif;font-size:30px;margin:18px 0 10px}.wechat-box p:last-child{color:#666;line-height:1.8}
@media(max-width:760px){.platform-actions{flex-direction:column}.platform-btn{width:100%}}