:root{--ink:#1d1d1f;--ink2:#6e6e73;--ink3:#86868b;--line:#e8e8ed;--bg2:#f5f5f7;--acc:#ff5b14;--link:#0066cc;--ease:cubic-bezier(.25,.1,.25,1);--ease2:cubic-bezier(.2,.9,.2,1)}
*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:#fff;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;-webkit-font-smoothing:antialiased;line-height:1.5}
a{color:inherit;text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
/* nav */
.nav{position:sticky;top:0;z-index:50;height:48px;background:rgba(255,255,255,.78);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid transparent;transition:border-color .3s}
.nav.sc{border-bottom-color:var(--line)}
.nav .in{max-width:1080px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;gap:30px;font-size:12px;color:#424245}
.nav .lg{display:flex;align-items:center;gap:8px;font-weight:600;font-size:14px;color:var(--ink);letter-spacing:-.01em;margin-right:auto}
.nav .lg img{width:24px;height:18px;display:block}
.nav a.l:hover{color:var(--ink)}
.nav .dl{background:var(--ink);color:#fff;border-radius:980px;padding:6px 14px;font-weight:500;transition:background .2s}.nav .dl:hover{background:#000}
/* hero */
.hero{text-align:center;padding:84px 0 0;overflow:hidden}
.eb{font-size:17px;font-weight:600;color:var(--ink2);margin:0 0 10px;letter-spacing:-.01em}
h1{font-size:min(7.6vw,76px);line-height:1.06;letter-spacing:-.045em;font-weight:700;margin:0 0 18px;white-space:nowrap}
h1 em{font-style:normal;color:var(--acc);display:inline-block}
.sub{font-size:min(4.2vw,21px);color:var(--ink2);margin:0 0 26px;letter-spacing:-.01em}
.cta{display:flex;gap:26px;justify-content:center;align-items:center;font-size:17px}
.btn{display:inline-block;background:var(--ink);color:#fff;border-radius:980px;padding:12px 24px;font-size:16px;font-weight:500;transition:background .2s,transform .15s}.btn:hover{background:#000}.btn:active{transform:scale(.97)}
.lk{color:var(--link)}.lk:hover{text-decoration:underline}
.note{font-size:12px;color:var(--ink3);margin-top:14px}
.stage{padding-top:56px}
/* product window */
.win{width:min(88%,860px);margin:0 auto;border-radius:16px 16px 0 0;background:#fff;box-shadow:0 0 0 1px #e3e3e8,0 50px 100px -24px rgba(0,0,0,.3);overflow:hidden;text-align:left;display:grid;grid-template-columns:190px 1fr}
.win .tb{grid-column:1/-1;display:flex;gap:7px;align-items:center;padding:12px 16px;background:#f5f5f7;font-size:12px;color:var(--ink2)}.win .tb i{width:11px;height:11px;border-radius:50%;display:block}.win .tb span{margin-left:10px;font-weight:500}
.side{padding:18px 12px;border-right:1px solid #f0f0f2;font-size:12.5px;color:var(--ink2)}
.side .it{padding:8px 10px;border-radius:8px;margin-bottom:2px}.side .on{background:#f5f5f7;color:var(--ink);font-weight:500}.side .gl{font-size:10.5px;color:var(--ink3);padding:10px 10px 6px}
.main{padding:22px 26px 0}
.pair{display:grid;grid-template-columns:1fr 46px 1fr;gap:8px;align-items:center;margin-bottom:14px}
.c{background:var(--bg2);border-radius:12px;padding:11px 14px}.c small{font-size:11px;color:var(--ink3)}.c b{display:block;font-size:14px;font-weight:600;letter-spacing:-.02em;white-space:nowrap}
.cnt{width:36px;height:36px;border-radius:50%;background:var(--ink);color:#fff;font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center;margin:0 auto;transition:transform .3s}
.cnt .od{height:1.3em;line-height:1.3em;overflow:hidden;width:1em;text-align:center}.cnt .od span{display:block;transition:transform .45s var(--ease2)}.cnt.bump{transform:scale(1.18)}
.li{display:flex;align-items:center;gap:12px;padding:11px 2px;font-size:13.5px;border-top:1px solid #f0f0f2}
.ck{width:18px;height:18px;border-radius:50%;box-shadow:inset 0 0 0 1.5px #d2d2d7;flex:none;position:relative;transition:background .25s,box-shadow .25s,transform .35s cubic-bezier(.3,1.6,.5,1)}
.ck::after{content:"";position:absolute;left:6px;top:3px;width:4px;height:8px;border:solid #fff;border-width:0 1.7px 1.7px 0;transform:rotate(40deg) scale(0);transition:transform .25s .1s}
.li.on .ck{background:var(--ink);box-shadow:none;transform:scale(1.1)}.li.on .ck::after{transform:rotate(40deg) scale(1)}
.li.on{background:linear-gradient(90deg,#f5f5f7,transparent)}.li.dim{color:#a1a1a6}
.act{padding:14px 0 22px}
.go{position:relative;overflow:hidden;background:var(--ink);color:#fff;border-radius:980px;padding:12px 0;text-align:center;font-size:14px;font-weight:500;transition:background .3s}
.go .f{position:absolute;inset:0;background:rgba(255,255,255,.22);transform-origin:left;transform:scaleX(0)}
.go.busy .f{transform:scaleX(1);transition:transform 1.1s cubic-bezier(.4,.1,.2,1)}.go.done{background:#2f9e44}.go span.t{position:relative}
/* sections */
.sec{padding:110px 0;text-align:center}.gray{background:var(--bg2)}
h2{font-size:min(6vw,52px);letter-spacing:-.045em;font-weight:700;line-height:1.08;margin:0 0 12px;white-space:nowrap}
.lead{font-size:min(3.8vw,20px);color:var(--ink2);margin:0 auto}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:64px}
.three b{display:block;font-size:min(5.6vw,36px);letter-spacing:-.045em;font-weight:700;margin-bottom:10px;white-space:nowrap}
.three span{font-size:15px;color:var(--ink2);line-height:1.55;display:block}
.tools{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:56px;text-align:left}
.tl{background:var(--bg2);border-radius:22px;padding:22px 20px 20px;transition:transform .35s var(--ease2),box-shadow .35s}
.tl:hover{transform:translateY(-4px);box-shadow:0 18px 40px -18px rgba(0,0,0,.25)}
.tl b{display:block;font-size:20px;letter-spacing:-.035em;font-weight:700;margin-bottom:6px}
.tl span{font-size:13px;color:var(--ink2);display:block;min-height:2.9em}
.tg{display:inline-block;margin-top:14px;font-size:11.5px;font-weight:500;padding:3px 10px;border-radius:980px;background:var(--ink);color:#fff}.tg.e{background:transparent;color:var(--ink2);box-shadow:inset 0 0 0 1px #d2d2d7}
.foot-note{font-size:12.5px;color:var(--ink3);margin-top:22px}
.dark{background:#000;color:#f5f5f7;padding:130px 0}
.dark h2{filter:blur(0)}.dark .lead{color:#a1a1a6;margin-bottom:28px}
.dark .btn{background:#fff;color:var(--ink)}.dark .btn:hover{background:#e8e8ed}
.dl-sec{padding:120px 0 90px;text-align:center}
.small{font-size:12.5px;color:var(--ink3);margin-top:14px}
footer{background:var(--bg2);font-size:11.5px;color:var(--ink3);padding:22px 0}
footer .in{max-width:1080px;margin:0 auto;padding:0 24px;display:flex;gap:22px;flex-wrap:wrap}footer .in span:first-child{margin-right:auto}
footer a:hover{color:var(--ink)}
.dis{font-size:11px;color:var(--ink3);max-width:1080px;margin:14px auto 0;padding:0 24px;line-height:1.6}
/* reveal */
.rv{opacity:0;transform:translateY(24px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.rv.in{opacity:1;transform:none}.d1{transition-delay:.08s}.d2{transition-delay:.18s}.d3{transition-delay:.28s}.d4{transition-delay:.38s}
.blur{filter:blur(10px);opacity:0;transition:filter 1.1s var(--ease),opacity 1.1s var(--ease)}.blur.in{filter:blur(0);opacity:1}
.winrv{opacity:0;transform:translateY(70px) scale(.96);transition:opacity 1.1s var(--ease),transform 1.2s var(--ease2)}.winrv.in{opacity:1;transform:none}
.pp{animation:pp 1.1s ease-out 1}@keyframes pp{0%{transform:scale(1)}40%{transform:scale(1.55)}100%{transform:scale(1)}}
@media(max-width:860px){.win{grid-template-columns:1fr}.side{display:none}.tools{grid-template-columns:repeat(2,1fr)}.nav .l{display:none}.sec{padding:84px 0}.dark{padding:100px 0}}
@media(max-width:560px){.three{grid-template-columns:1fr;gap:34px}.tools{grid-template-columns:1fr}.cta{flex-direction:column;gap:14px}.pair{grid-template-columns:1fr}.cnt{display:none}.hero{padding-top:60px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.rv,.blur,.winrv{transition:none!important;opacity:1!important;transform:none!important;filter:none!important}.pp{animation:none}.go .f,.cnt .od span,.ck,.ck::after{transition:none!important}}

/* ---- v2: 内容补足 ---- */
.nav .dl{background:none;color:var(--ink);border-radius:0;padding:0;font-weight:500}.nav .dl:hover{background:none;text-decoration:underline}
.narrow{max-width:760px}
.feat{padding:110px 0;background:#fff}.feat.alt{background:var(--bg2)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center}.two.rev .vis{order:-1}
.kick{font-size:14px;font-weight:600;color:var(--acc);margin:0 0 12px;letter-spacing:.01em}
.feat h3{font-size:min(5.2vw,46px);line-height:1.1;letter-spacing:-.045em;font-weight:700;margin:0 0 18px}
.feat .tx>p:not(.kick){font-size:17px;color:var(--ink2);line-height:1.65;margin:0 0 20px}
.feat ul{list-style:none;padding:0;margin:0}.feat li{font-size:15px;color:#424245;padding:9px 0 9px 22px;position:relative;border-top:1px solid #ececf0}.feat li:first-child{border-top:0}
.feat li::before{content:"";position:absolute;left:2px;top:17px;width:7px;height:7px;border-radius:50%;background:var(--ink)}
.vis{display:flex;justify-content:center}
.card1{width:100%;max-width:440px;background:#fff;border-radius:28px;padding:24px;box-shadow:0 0 0 1px #ececf0,0 40px 80px -30px rgba(0,0,0,.2)}
.feat.alt .card1{background:#fff}.feat:not(.alt) .card1{background:var(--bg2);box-shadow:0 40px 80px -36px rgba(0,0,0,.22)}
.card1 .pr{display:grid;grid-template-columns:1fr 32px 1fr;gap:8px;align-items:center;margin-bottom:12px}
.card1 .c{background:#fff;border-radius:14px;padding:11px 14px}.feat.alt .card1 .c{background:var(--bg2)}.card1 .c small{font-size:11px;color:var(--ink3);display:block}.card1 .c b{font-size:16px;letter-spacing:-.03em;font-weight:700}
.card1 .arr{text-align:center;color:var(--ink3);font-size:18px}
.card1 .rw{display:flex;align-items:center;gap:12px;padding:12px 4px;font-size:14px;border-top:1px solid #e6e6ea}.card1 .rw:first-of-type{border-top:0}
.d{width:18px;height:18px;border-radius:50%;box-shadow:inset 0 0 0 1.5px #d2d2d7;flex:none;position:relative;display:block}.d.on{background:var(--ink);box-shadow:none}.d.on::after{content:"";position:absolute;left:6px;top:3px;width:4px;height:8px;border:solid #fff;border-width:0 1.7px 1.7px 0;transform:rotate(40deg)}
.mut{color:#a1a1a6}
.file{display:flex;align-items:center;gap:14px;background:var(--bg2);border-radius:16px;padding:14px 16px;margin-bottom:12px}
.file .fi{width:40px;height:40px;border-radius:10px;background:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 0 0 1px #e6e6ea}.file .fi svg{width:20px;height:20px;stroke:var(--ink);fill:none;stroke-width:1.6;stroke-linejoin:round}
.file b{display:block;font-size:13.5px;letter-spacing:-.02em;font-weight:600}.file small{font-size:12px;color:var(--ink3)}
.file .lk2{margin-left:auto;font-size:11.5px;font-weight:500;background:var(--ink);color:#fff;border-radius:980px;padding:3px 10px;white-space:nowrap}
.pw{background:var(--bg2);border-radius:14px;padding:12px 16px;margin-bottom:12px}.pw small{font-size:11px;color:var(--ink3);display:block;margin-bottom:6px}
.dots{display:flex;gap:7px}.dots i{width:9px;height:9px;border-radius:50%;background:var(--ink);display:block}
.from{font-size:12.5px;color:var(--ink2);padding:2px 4px}
.sync{display:flex;align-items:center;justify-content:space-between;gap:6px;padding:34px 22px;background:var(--bg2)}
.node{text-align:center;flex:none}.node small{display:block;font-size:11.5px;color:var(--ink2);margin-top:9px;white-space:nowrap}
.mac{width:58px;height:40px;border-radius:7px;border:2.5px solid var(--ink);margin:0 auto;position:relative;background:#fff}.mac::after{content:"";position:absolute;left:-9px;right:-9px;bottom:-9px;height:5px;border-radius:0 0 7px 7px;background:var(--ink)}
.cloud{width:62px;height:40px;margin:0 auto;position:relative}.cloud::before{content:"";position:absolute;left:0;bottom:0;width:62px;height:26px;border-radius:20px;border:2.5px solid var(--ink);background:#fff}.cloud::after{content:"";position:absolute;left:14px;top:2px;width:26px;height:26px;border-radius:50%;border:2.5px solid var(--ink);border-bottom-color:transparent;border-left-color:transparent;transform:rotate(-30deg)}
.link{flex:1;min-width:14px;position:relative;height:2px;background:#d2d2d7;align-self:flex-start;margin-top:24px;overflow:hidden;border-radius:2px}
.link i{position:absolute;top:-3px;left:-10px;width:8px;height:8px;border-radius:50%;background:var(--acc);animation:fly 2.6s ease-in-out infinite}
.link:nth-of-type(4) i{animation-delay:1.3s}
@keyframes fly{0%{left:-10px}100%{left:100%}}
.hd2{font-size:15px;font-weight:700;letter-spacing:-.02em;margin:2px 4px 8px}
.rw2{display:flex;align-items:center;gap:10px;padding:13px 4px;font-size:13.5px;border-top:1px solid #ececf0}.rw2:first-of-type{border-top:0}.rw2 span{flex:1}.rw2 em{font-style:normal;font-size:13px;color:var(--link)}.rw2 em.gone{color:var(--ink3)}
.four{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:64px;text-align:left}
.four b{display:block;font-size:20px;letter-spacing:-.035em;font-weight:700;margin-bottom:8px;color:#fff}.four span{font-size:14px;color:#a1a1a6;line-height:1.65;display:block}
.faq{margin-top:48px;text-align:left}.faq details{border-top:1px solid var(--line);padding:0}.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:22px 36px 22px 0;font-size:19px;font-weight:600;letter-spacing:-.025em;position:relative}.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:6px;top:50%;width:11px;height:11px;margin-top:-8px;border:solid var(--ink2);border-width:0 2px 2px 0;transform:rotate(45deg);transition:transform .3s var(--ease2)}
.faq details[open] summary::after{transform:rotate(-135deg);margin-top:-2px}
.faq p{margin:0;padding:0 0 24px;font-size:16px;color:var(--ink2);line-height:1.7;max-width:640px}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:20px;align-items:start}footer .cols>div{display:flex;flex-direction:column;gap:7px}footer .cols b{color:var(--ink);font-size:12px;font-weight:600;margin-bottom:3px}footer .cols .mut{color:#a1a1a6}
footer .in span:first-child{margin-right:0}
@media(max-width:860px){.two{grid-template-columns:1fr;gap:40px}.two.rev .vis{order:0}.feat{padding:84px 0}.four{grid-template-columns:repeat(2,1fr)}footer .cols{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.four{grid-template-columns:1fr}.feat h3{font-size:min(8vw,34px)}.sync{padding:26px 14px}.mac{width:46px;height:32px}.cloud{transform:scale(.85)}}
@media(prefers-reduced-motion:reduce){.link i{animation:none;left:40%}}

/* ---- v3: 精简 + logo ---- */
.logos{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:56px}
.lt{background:var(--bg2);border-radius:24px;padding:28px 14px 22px;display:flex;flex-direction:column;align-items:center;text-align:center;transition:transform .35s var(--ease2),box-shadow .35s}
.lt:hover{transform:translateY(-4px);box-shadow:0 18px 40px -18px rgba(0,0,0,.25)}
.lg2{width:64px;height:64px;border-radius:16px;overflow:hidden;background:#fff;box-shadow:0 0 0 1px #ececf0,0 6px 14px -8px rgba(0,0,0,.25);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.lg2 img{width:100%;height:100%;object-fit:contain;display:block}.lg2.pad img{width:58%;height:58%}.lg2.wide img{width:86%;height:auto}
.lt b{font-size:17px;letter-spacing:-.03em;font-weight:700;margin-bottom:10px}
.lt .tg{margin-top:0}
.dark .lead{margin-bottom:0}
@media(max-width:860px){.logos{grid-template-columns:repeat(2,1fr)}}

/* 可交互窗口 */
.win .tb .hint{margin-left:auto;font-style:normal;font-size:11px;color:var(--ink3)}
button.c{border:0;font:inherit;text-align:left;cursor:pointer;color:inherit;position:relative;transition:background .2s,transform .15s}
button.c:hover{background:#ececf0}button.c:active{transform:scale(.98)}
.c.pk::after{content:"";position:absolute;right:13px;top:50%;width:6px;height:6px;border:solid #86868b;border-width:0 1.5px 1.5px 0;transform:translateY(-70%) rotate(45deg)}
.c b{transition:opacity .2s}
.li{cursor:pointer;user-select:none;transition:background .2s}.li:hover .ck{box-shadow:inset 0 0 0 1.5px #86868b}.li.on:hover .ck{box-shadow:none}
.li.dim{cursor:default}
button.go{display:block;width:100%;border:0;font-family:inherit;cursor:pointer}button.go:active{transform:scale(.99)}
button.go.off{background:#d2d2d7;cursor:default}
.go.done{cursor:pointer}
#rows{min-height:0}
.li.in{animation:rowin .35s var(--ease)}@keyframes rowin{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
button.c:focus-visible,button.go:focus-visible{outline:2px solid #0071e3;outline-offset:2px}

/* 窗口内多个页面 */
.main{min-height:372px}
.vw{display:none}.vw.on{display:block;animation:rowin .35s var(--ease)}
button.it{display:block;width:100%;border:0;background:none;font:inherit;text-align:left;color:inherit;cursor:pointer;transition:background .2s}
button.it:hover{background:#f5f5f7}button.it:focus-visible{outline:2px solid #0071e3;outline-offset:-2px}
.vt{font-size:16px;font-weight:600;letter-spacing:-.02em;margin:2px 0 4px}.vs{font-size:12.5px;color:var(--ink2);margin:0 0 12px;line-height:1.5}
.pw{width:100%;box-sizing:border-box;margin-top:12px;border:0;border-radius:10px;background:var(--bg2);padding:11px 14px;font:inherit;font-size:13px;color:var(--ink)}
.pw:focus{outline:2px solid #0071e3;outline-offset:1px}
.out{margin-top:10px;font-size:12.5px;color:var(--ink2);min-height:0}.out:empty{display:none}
.out.on,.out.ok{background:var(--bg2);border-radius:10px;padding:10px 14px}.out.ok{color:#1d7a34}
.drop{display:block;width:100%;border:1.5px dashed #d2d2d7;border-radius:12px;background:none;font:inherit;padding:34px 10px;cursor:pointer;color:var(--ink);transition:background .2s,border-color .2s}
.drop:hover{background:#fafafa;border-color:#86868b}.drop b{display:block;font-size:14px;font-weight:600}.drop span{font-size:12px;color:var(--ink3)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.chip{border:0;font:inherit;font-size:13px;padding:9px 16px;border-radius:980px;background:var(--bg2);color:var(--ink);cursor:pointer;transition:background .2s,color .2s}
.chip.on{background:var(--ink);color:#fff}
.dev{display:grid;grid-template-columns:1fr 1fr;gap:8px}.dev>div{background:var(--bg2);border-radius:12px;padding:11px 14px;font-size:13px;font-weight:500;display:flex;flex-direction:column;gap:3px}
.dev small{font-weight:400;font-size:11.5px;color:var(--ink3);padding-left:15px}
.dv{display:inline-block;width:7px;height:7px;border-radius:50%;background:#d2d2d7;margin-right:8px;transition:background .3s}.dv.on{background:#28c840}
.rec{display:flex;align-items:center;gap:12px;padding:12px 2px;border-top:1px solid #f0f0f2;font-size:13.5px;transition:opacity .3s}
.rec span{flex:1}.rec small{display:block;color:var(--ink3);font-size:11.5px;margin-top:2px}
.rec button{border:0;background:var(--bg2);border-radius:980px;font:inherit;font-size:12.5px;padding:6px 14px;cursor:pointer}.rec button:hover{background:#e8e8ed}
.rec.gone{opacity:0}
.empty,.soon{padding:44px 0;text-align:center;color:var(--ink3);font-size:13.5px}
.li.nc{cursor:default}
@media(max-width:860px){.main{min-height:0}}
@media(max-width:860px){
.side{display:flex;gap:6px;overflow-x:auto;padding:10px 12px;border-right:0;border-bottom:1px solid #f0f0f2;scrollbar-width:none}.side::-webkit-scrollbar{display:none}
.side .gl{display:none}button.it{width:auto;flex:none;white-space:nowrap;border-radius:980px;padding:7px 14px;margin:0}
.win .tb span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.win .tb .hint{display:none}.main{padding:18px 18px 0}}
/* language switcher */
.nav .lang{font:inherit;font-size:12px;color:#424245;background:transparent;border:1px solid var(--line);border-radius:980px;padding:5px 10px;cursor:pointer;max-width:130px}
.nav .lang:hover{color:var(--ink)}.nav .lang:focus-visible{outline:2px solid #0071e3;outline-offset:2px}
@media(max-width:860px){.nav .in{gap:14px}}
/* 非中文语言标题更长:缩小字号并允许换行 */
html:not([lang^="zh"]) h1{font-size:min(6.2vw,60px);white-space:normal;text-wrap:balance;letter-spacing:-.03em}
html:not([lang^="zh"]) h1 span{display:inline!important}
html[lang="zh-Hant"] h1{font-size:min(7.6vw,76px)}
.btn.alt{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink);margin-left:10px}.btn.alt:hover{background:var(--ink);color:#fff}@media(max-width:560px){.btn.alt{margin:12px 0 0}}