:root{color-scheme:light;--paper:#f7f5ed;--pine:#285c51;--ink:#213f37;--muted:#617065;--line:#dce1d7;--apricot:#ba602f;font-family:-apple-system,BlinkMacSystemFont,"SF Pro Rounded","PingFang SC","Microsoft YaHei",sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink)}a{color:inherit;text-decoration:none}button{font:inherit}a:focus-visible,button:focus-visible{outline:3px solid var(--apricot);outline-offset:6px}a,button{-webkit-tap-highlight-color:transparent}
.page{max-width:1240px;min-height:100vh;min-height:100svh;margin:auto;padding:0 max(40px,env(safe-area-inset-right)) 0 max(40px,env(safe-area-inset-left));display:flex;flex-direction:column}
.site-header{padding-top:max(28px,env(safe-area-inset-top));display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;align-items:center;gap:12px;font-size:19px;letter-spacing:.04em;font-weight:650}.brand img{border-radius:10px}.header-note{font-size:13px;letter-spacing:.12em;color:var(--muted)}
.hero{flex:1;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:clamp(28px,5svh,60px) 0 clamp(28px,5svh,56px)}.identity{position:relative;width:176px;height:142px;display:grid;place-items:center;margin-bottom:22px}.hero-icon{position:relative;border-radius:27px;box-shadow:0 12px 30px #204d4314;animation:breathe 4s ease-in-out infinite}.echo{position:absolute;border:1px solid #285c5110;border-radius:50%;width:162px;height:162px}.echo-two{width:220px;height:220px;border-color:#285c5108}.eyebrow{margin:0 0 19px;font-size:11px;font-weight:600;letter-spacing:.25em;color:var(--muted)}h1{margin:0;font-size:clamp(52px,7.3vw,88px);line-height:1.24;letter-spacing:-.055em;font-weight:700;color:var(--pine)}h1 span{display:block}.intro{font-size:16px;line-height:1.95;margin:28px 0 0;color:var(--muted);letter-spacing:.02em}.downloads{display:flex;gap:18px;max-width:100%;margin-top:30px}.download-option{width:244px;min-width:0}.download-button{min-height:66px;padding:0 24px;display:flex;align-items:center;justify-content:center;gap:12px;border-radius:22px;font-size:16px;font-weight:600;transition:transform .2s,box-shadow .2s,background .2s}.download-button svg{width:22px;height:22px;flex-shrink:0}.download-button .arrow{margin-left:auto;font-size:19px;font-weight:400}.primary{background:var(--pine);color:#fff;box-shadow:0 6px 18px #285c5114;border:1px solid var(--pine)}.secondary{background:#ffffffa6;color:var(--pine);border:1px solid #285c5126;box-shadow:inset 0 1px 0 #fff}.site-footer{display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:12px;color:var(--muted);padding:22px 0 max(24px,env(safe-area-inset-bottom));border-top:1px solid var(--line)}.site-footer nav{display:flex;gap:15px;align-items:center}.site-footer a:hover{text-decoration:underline;text-underline-offset:4px}
.guide{flex:1;display:grid;place-items:center;padding:52px 0}.guide-panel{width:min(100%,540px);background:#fff;border:1px solid var(--line);border-radius:28px;padding:40px;box-shadow:0 14px 45px #285c5108}.guide-symbol{font-size:45px;color:var(--pine);text-align:right;line-height:1}.guide h1{font-size:30px;letter-spacing:-.03em;line-height:1.4;margin:15px 0 22px}.guide p{font-size:16px;line-height:1.9;color:var(--muted)}.guide ol{padding-left:24px;line-height:2.1;margin:25px 0}.guide .download-button{width:100%;cursor:pointer}.copy-address{display:block;font-size:13px;line-height:1.6;background:var(--paper);border-radius:12px;padding:14px;overflow-wrap:anywhere;user-select:all;margin:22px 0 18px}.guide .copy-status{min-height:24px;font-size:13px;margin:12px 0 0;text-align:center}.return-home{display:block;text-align:center;margin:24px 0 0;font-size:14px;text-decoration:underline;text-underline-offset:4px}
.document-home{font-size:13px;color:var(--muted);white-space:nowrap}.document-home:hover{text-decoration:underline;text-underline-offset:4px}.document-main{flex:1;width:100%;max-width:760px;margin:0 auto;padding:72px 0 80px}.document-header{padding-bottom:30px;border-bottom:1px solid var(--line);margin-bottom:32px}.document-header .eyebrow{text-transform:uppercase;margin-bottom:14px}.document-header h1{font-size:44px;line-height:1.3;letter-spacing:-.035em}.document-updated{font-size:13px;color:var(--muted);margin:18px 0 0}.document-content{font-size:16px;line-height:1.95;overflow-wrap:anywhere}.document-content h2{font-size:22px;line-height:1.5;color:var(--pine);margin:38px 0 14px;letter-spacing:-.02em}.document-content h3{font-size:17px;line-height:1.65;color:var(--pine);margin:26px 0 8px}.document-content p{margin:0 0 18px}.document-content ol{padding-left:24px;margin:0 0 20px}.document-content li{padding-left:3px;margin:0 0 10px}.document-content a{text-decoration:underline;text-underline-offset:3px}.document-content section[lang=en]{border-top:1px solid var(--line);margin-top:40px;padding-top:2px}.site-footer{flex-wrap:wrap}.site-footer nav{flex-wrap:wrap}
@media(max-width:600px){.document-main{padding:48px 0 50px}.document-header{padding-bottom:24px;margin-bottom:26px}.document-header h1{font-size:36px}.document-content{font-size:15px;line-height:1.95}.document-content h2{font-size:20px;margin-top:30px}.document-content h3{font-size:16px}.document-home{font-size:12px}}
@media(hover:hover){.download-button:hover{transform:translateY(-2px);box-shadow:0 8px 24px #285c511c}.primary:hover{background:#204d43}.secondary:hover{background:#fff}}

@media(max-width:600px){.page{padding-left:max(24px,env(safe-area-inset-left));padding-right:max(24px,env(safe-area-inset-right))}.site-header{padding-top:max(23px,env(safe-area-inset-top))}.brand{font-size:17px}.header-note{display:none}.hero{padding:24px 0 24px}.identity{height:90px;margin-bottom:16px;flex-shrink:0}.hero-icon{width:72px;height:72px;border-radius:19px}.echo{width:114px;height:114px}.echo-two{width:150px;height:150px}.hero .eyebrow{font-size:10px;margin-bottom:12px}.hero h1{font-size:clamp(42px,11.5vw,56px);line-height:1.16}.intro{font-size:14px;line-height:1.75;margin-top:18px}.downloads{width:100%;max-width:360px;flex-direction:column;gap:14px;margin-top:22px}.download-option{width:100%}.download-button{min-height:54px;border-radius:18px;justify-content:flex-start;padding:0 22px}.site-footer{font-size:11px;padding-top:19px;gap:12px}.site-footer nav{gap:10px}.guide{padding:38px 0}.guide-panel{padding:26px}.guide h1{font-size:27px}.guide p,.guide ol{font-size:15px}}
@media(max-width:360px){.page{padding-left:20px;padding-right:20px}.site-footer{flex-direction:column;gap:12px}.intro{font-size:13px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
@keyframes breathe{0%,100%{transform:translateY(0)}50%{transform:translateY(-4px)}}

/* Keep the page in normal flow; Safari's expanding controls must not trap the footer. */
.landing-page .site-footer{padding-bottom:calc(20px + env(safe-area-inset-bottom));flex-shrink:0}
@media(max-width:600px) and (max-height:740px){
 .landing-page .site-header{padding-top:max(16px,env(safe-area-inset-top))}
 .hero{padding:18px 0 20px}.identity{height:66px;margin-bottom:12px}.hero-icon{width:58px;height:58px;border-radius:16px}.echo{width:90px;height:90px}.echo-two{width:120px;height:120px}
 .hero h1{font-size:42px}.hero .eyebrow{margin-bottom:10px}.intro{margin-top:14px}.downloads{margin-top:18px;gap:12px}
 .landing-page .site-footer{padding-top:16px}
}
@media(min-width:601px) and (max-height:800px){
 .hero{padding:22px 0 28px}.identity{height:90px;margin-bottom:16px}.hero-icon{width:72px;height:72px;border-radius:19px}.echo{width:114px;height:114px}.echo-two{width:150px;height:150px}
 .hero h1{font-size:60px}.hero .eyebrow{margin-bottom:12px}.intro{margin-top:18px}.downloads{margin-top:24px}
}