:root{--ink:#1c2a1f;--muted:#69766c;--dark:#162218;--green:#5b8d5b;--light:#edf4ec;--paper:#f6f9f5;--line:#d6e2d5}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);line-height:1.85}img{display:block;max-width:100%;height:auto}a{color:inherit}.shell{width:min(1180px,calc(100% - 40px));margin:auto}.and-head{position:sticky;top:0;z-index:60;background:var(--dark);color:#fff}.and-head>.shell{min-height:68px;display:grid;grid-template-columns:180px 1fr auto;align-items:center}.brand img{height:31px;max-width:150px}.and-mark{display:flex;justify-content:center;gap:12px;font-size:10px;letter-spacing:.14em;color:#92a894}.and-head>.shell>a:last-child{text-decoration:none;font-weight:900}.hero{padding:82px 0;background:#1b2e20;color:#fff}.hero-grid{display:grid;grid-template-columns:1fr .9fr;gap:58px;align-items:center}.hero-copy>span,.section-head>span,.scope span,.download-now span,.mobile-use span,.step-head>span,.download-band span,.faq-layout>div>span{font-size:10px;letter-spacing:.17em;font-weight:900;color:#8eb590}.hero h1,.phone-view h2,.scope h2,.download-now h2,.mobile-use h2,.steps h2,.download-band h2,.faq h2{margin:7px 0;font-size:clamp(36px,5vw,64px);line-height:1.04;letter-spacing:-.05em}.lead{font-size:18px;color:#d1dcd3}.hero p{color:#d1dcd3}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.hero-actions a{display:inline-flex;min-height:49px;align-items:center;padding:0 18px;border:1px solid #718876;text-decoration:none;font-weight:900}.hero-actions .primary{background:#fff;color:var(--dark)}.hero figure{margin:0;background:#fff;padding:14px}.hero img{width:100%;max-height:450px;object-fit:contain}.phone-view{padding:34px 0 86px}.section-head{max-width:830px;margin-bottom:28px}.phone-view h2,.scope h2,.download-now h2,.mobile-use h2,.steps h2,.download-band h2,.faq h2{font-size:clamp(30px,3.6vw,46px);line-height:1.15}.section-head p,.scope p,.download-now p,.mobile-use p{color:var(--muted);font-size:17px}.phone-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.phone-grid figure{margin:0;padding:14px;background:var(--paper);border:1px solid var(--line)}.phone-grid img{width:100%;height:330px;object-fit:contain;background:#fff}.phone-grid figcaption{font-size:13px;color:var(--muted);padding-top:8px}.scope{padding:86px 0;background:var(--light)}.scope-grid{display:grid;grid-template-columns:.62fr 1.38fr;gap:62px}.download-now{padding:92px 0}.download-grid,.use-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:58px;align-items:center}.download-now figure,.mobile-use figure{margin:0;background:var(--paper);padding:14px}.download-now img,.mobile-use img{width:100%;max-height:450px;object-fit:contain}.download-now a,.mobile-use a{display:inline-flex;margin-top:12px;padding:10px 17px;background:var(--dark);color:#fff;text-decoration:none;font-weight:900}.mobile-use{padding:92px 0;background:var(--paper)}.android-pair{padding:84px 0}.pair-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.pair-grid figure{margin:0;background:var(--paper);padding:14px}.pair-grid img{width:100%;height:390px;object-fit:contain}.steps{padding:84px 0;background:#dfeadd}.step-head{max-width:820px}.step-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:26px}.step-grid>div{padding:20px;background:#fff}.step-grid b{color:var(--green)}.step-grid strong{display:block;margin-top:12px}.step-grid p{font-size:14px;color:var(--muted)}.download-band{padding:62px 0;background:var(--dark);color:#fff}.download-band>.shell{display:grid;grid-template-columns:1fr auto;gap:35px;align-items:center}.download-band>div>div:last-child{display:flex;gap:10px}.download-band a{display:flex;min-width:215px;min-height:49px;align-items:center;justify-content:center;border:1px solid #718876;text-decoration:none;font-weight:900}.download-band a:first-child{background:#fff;color:var(--dark)}.faq{padding:88px 0;background:#f6f9f5}.faq-layout{display:grid;grid-template-columns:.58fr 1.42fr;gap:60px}.faq-list details{border-bottom:1px solid var(--line)}.faq-list summary{cursor:pointer;list-style:none;padding:20px 2px;font-size:18px;font-weight:900}.faq-list p{margin:-3px 0 22px;color:var(--muted)}.footer50{padding:34px 0 74px;background:#101812;color:#e2e9e3}.footer50>.shell{display:grid;grid-template-columns:1.2fr 1fr auto;gap:28px;align-items:center}.android-line span,.android-line strong{display:block}.android-line span{font-size:10px;letter-spacing:.14em;color:#7f917f}.android-links{display:flex;gap:14px}.android-links a{text-decoration:none;color:#c5d0c6}.android-download{text-decoration:none;font-weight:900}.mobile-bar{display:none}@media(max-width:900px){.and-head>.shell{grid-template-columns:1fr auto}.and-mark{display:none}.hero-grid,.scope-grid,.download-grid,.use-grid,.download-band>.shell,.faq-layout,.footer50>.shell{grid-template-columns:1fr}.phone-grid,.step-grid{grid-template-columns:1fr 1fr}.download-band>div>div:last-child{display:grid}}@media(max-width:600px){body{font-size:15px;padding-bottom:62px}.shell{width:min(100% - 28px,1180px)}.and-head>.shell{min-height:62px}.brand img{height:28px}.hero{padding:56px 0}.hero h1{font-size:clamp(42px,14vw,58px)}.phone-view,.scope,.download-now,.mobile-use,.android-pair,.steps,.faq{padding:62px 0}.phone-grid,.pair-grid,.step-grid{grid-template-columns:1fr}.phone-grid img,.pair-grid img{height:auto;max-height:300px}.download-band a{width:100%}.android-links{display:grid}.mobile-bar{position:fixed;left:0;right:0;bottom:0;z-index:80;display:flex;min-height:60px;align-items:center;justify-content:space-between;padding:8px 14px;background:#101812;color:#fff}.mobile-bar a{display:inline-flex;min-width:100px;min-height:40px;align-items:center;justify-content:center;background:#fff;color:#162218;text-decoration:none;font-weight:900}}