:root{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:#142d46;background:#f5f9fd;font-synthesis:none}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 10% 10%,#d6efff,transparent 55%),radial-gradient(ellipse at 95% 45%,#e1f7f8,transparent 55%);min-height:100vh}a{color:inherit;text-decoration:none}a:focus-visible{outline:3px solid #005eb8;outline-offset:5px}header{max-width:1120px;margin:auto;padding:30px 28px;display:flex;align-items:center;justify-content:space-between;gap:16px}header>span{font-size:13px;color:#698199}.brand{font-size:20px;font-weight:750;display:flex;align-items:center;gap:10px}.brand img{width:36px;height:36px;border-radius:9px}main{max-width:1120px;margin:auto;padding:32px 28px 40px}.hero{display:grid;grid-template-columns:1fr 420px;gap:80px;align-items:center}.eyebrow{font-size:13px;color:#237cb6;letter-spacing:2px}h1{font-size:66px;line-height:1.15;letter-spacing:-2px;margin:22px 0}h1 em{font-style:normal;color:#0789eb}.lead{font-size:17px;color:#56718a;line-height:1.9;margin:0}.features{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.features span{font-size:13px;padding:8px 13px;border:1px solid #c9e2f2;border-radius:30px;color:#386b92;background:#ffffff70}.learning{margin-top:32px;max-width:440px}.learning-head{display:flex;align-items:center;justify-content:space-between;font-weight:650;font-size:14px}.spark{font-size:25px;color:#1c9beb}ol{list-style:none;padding:0;margin:12px 0 0;display:grid;gap:16px}li{display:flex;gap:14px;align-items:center}li b{font-size:20px;color:#5aabe4;background:#e0f0fc;border-radius:10px;padding:10px;font-weight:600}li span{font-size:15px;font-weight:600}li small{display:block;font-size:12px;font-weight:400;color:#6c8296;margin-top:5px}.download-card{background:#ffffffec;border:1px solid #fff;border-radius:28px;padding:34px;box-shadow:0 20px 70px #23659712;text-align:center}.app-icon{width:80px;height:80px;border-radius:20px;box-shadow:0 8px 24px #418bd219}h2{font-size:23px;margin:20px 0 8px}.device{font-size:13px;color:#668099;margin:0 0 24px}.download-actions{display:flex;flex-direction:column;gap:12px}.download-button{min-height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;gap:14px;font-size:16px;font-weight:600;cursor:pointer}.primary{color:white;background:linear-gradient(110deg,#08a8ef,#1579ed);box-shadow:0 6px 16px #1479ed25}.secondary{background:#f1f7fc;color:#36729c;border:1px solid #d9e8f4}.download-button[aria-disabled=true]{opacity:.6;cursor:default;box-shadow:none}.status{font-size:12px;color:#778b9b;line-height:1.8;min-height:44px;margin:14px 0 20px}.browser-tip{padding:13px;background:#fff3de;border-radius:12px;text-align:left;margin-bottom:16px;color:#845d25;font-size:12px;line-height:1.7}.browser-tip b,.browser-tip span{display:block}.qr-block{border-top:1px solid #edf2f6;padding-top:20px;display:flex;align-items:center;text-align:left;gap:15px}.qr-block img{width:108px;height:108px;flex-shrink:0}.qr-block b{font-size:14px}.qr-block p{font-size:12px;line-height:1.8;color:#7a8d9d}footer{text-align:center;padding:16px 24px 30px;color:#7c8f9f;font-size:12px}footer p{margin:0 0 10px}footer nav{display:flex;justify-content:center;gap:14px}footer a:hover{color:#0789eb}[hidden]{display:none!important}@media(max-width:850px){.hero{gap:36px;grid-template-columns:1fr 360px}h1{font-size:52px}.download-card{padding:26px}}@media(max-width:650px){header{padding:20px}header>span{font-size:11px}.brand{font-size:17px}.brand img{width:30px;height:30px}main{padding:16px 20px 20px}.hero{display:flex;flex-direction:column;gap:26px}.intro{width:100%;text-align:center}.eyebrow{font-size:12px;letter-spacing:1px}h1{font-size:43px;line-height:1.2;margin:16px 0}h1 br{display:none}h1 em{display:block}.lead{font-size:14px;line-height:1.8}.features{justify-content:center;margin-top:18px;gap:8px}.features span{font-size:12px;padding:6px 12px}.learning{display:none}.download-card{width:100%;max-width:420px;border-radius:23px;padding:25px 22px}.app-icon{width:60px;height:60px;border-radius:15px}h2{font-size:21px;margin-top:14px}.device{margin-bottom:20px}.qr-block{justify-content:center}.qr-block img{width:88px;height:88px}.qr-block b{font-size:13px}.status{margin-bottom:15px}footer{padding-bottom:max(24px,env(safe-area-inset-bottom))}}@media(prefers-reduced-motion:no-preference){.download-button{transition:transform .15s}.download-button:active{transform:scale(.98)}}