:root{--ink:#13202c;--blue:#2b6cff;--blue-deep:#1e5ae8;--paper:#ffffff;--surface:#f3f5f7;--navy:#13202c;--muted:#58626c;--line:#e3e6e9;--radius:8px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Noto Sans",sans-serif}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}button,select{font:inherit}:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.wrap{width:min(1280px,calc(100% - 96px));margin:auto}.skip{position:fixed;top:-100px;inset-inline-start:16px;padding:16px;background:var(--paper);z-index:10}.skip:focus{top:16px}
h1,h2,h3,p{margin-top:0}h1,h2,h3{letter-spacing:-0.01em;word-break:keep-all;line-break:strict;overflow-wrap:anywhere;font-weight:600;margin-bottom:24px}h1{font-size:64px;line-height:1.1;max-width:9em}h2{font-size:40px;line-height:1.2}h3{font-size:24px;line-height:1.35}p{font-size:17px;line-height:1.7;color:var(--ink);text-wrap:pretty;margin-bottom:16px}:is(h1,h2,h3):is(:lang(zh-CN),:lang(zh-TW),:lang(ja),:lang(ko)){letter-spacing:0}html[dir=rtl] :is(h1,h2,h3){letter-spacing:0}section{scroll-margin-top:32px}
.bar{background:var(--paper);border-bottom:1px solid var(--line)}.bar-inner{height:64px;display:flex;align-items:center;gap:16px;position:relative}.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:24px;line-height:1.35;min-height:44px;flex-shrink:0}.brand img{width:38px;height:38px;border-radius:var(--radius)}.nav{display:flex;gap:8px;margin-inline-start:auto;font-size:14px;line-height:1.6}.nav a,.menu a{display:flex;align-items:center;min-width:44px;min-height:44px;padding:8px}.nav a:hover,.text-link:hover,.menu a:hover{color:var(--blue-deep)}.lang{max-width:144px;min-width:44px;background:var(--paper);border:0;color:var(--ink);font-size:14px;line-height:1.6;min-height:44px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;border-radius:var(--radius);padding:8px 24px;background:var(--blue-deep);color:#fff;font-weight:600;font-size:17px;line-height:1.7;transition:background .2s}.btn:hover{transform:none;background:#174bc4}.btn[href^="https://web.vantachat.org/"]:after{content:'↗';font-size:17px;line-height:1}.bar-cta{min-height:44px;padding:8px 16px;font-size:14px;background:var(--paper);color:var(--blue-deep);box-shadow:inset 0 0 0 1px var(--blue-deep)}.menu{display:none;margin-inline-start:auto}.menu summary{display:flex;align-items:center;justify-content:center;cursor:pointer;list-style:none;min-width:44px;min-height:44px}.menu summary::-webkit-details-marker{display:none}.menu svg{width:24px;height:24px}.menu-panel{position:absolute;inset-inline:0;top:100%;z-index:5;padding:16px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius)}.menu-panel nav{display:grid;font-size:14px}.menu-panel .btn{margin-top:16px}
.hero{padding:56px 0 96px;display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}.kicker,.copy .kicker{font-size:14px;line-height:1.6;color:var(--blue-deep);font-weight:600;margin:0 0 8px}.lead{max-width:27em;margin-bottom:32px}.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:24px}.text-link{font-size:17px;line-height:1.6;border-bottom:0;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:6px;padding:8px 0;min-height:44px;display:inline-flex;align-items:center}.hero-art{margin:0}.hero-art img{width:100%;height:auto}
.feature{padding:96px 0}.mist{background:var(--surface)}.split{display:grid;grid-template-columns:1fr 1fr;column-gap:96px;align-items:center}.copy p{font-size:17px;color:var(--ink);max-width:34em}.copy p:last-child{margin-bottom:0}.shot{margin:0;overflow:hidden}.shot img{width:100%;height:auto}.privacy{background:var(--navy);color:#fff}.privacy p{color:#fff}.privacy .copy .kicker,.privacy .kicker{color:#a5bfff}.privacy{padding:96px 0}.privacy-top{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;margin-bottom:32px}.compare{display:grid;grid-template-columns:1fr 1fr;gap:64px}.compare-col h3{margin-bottom:24px}.compare ul{padding:0;list-style:none;margin:0}.compare li{font-size:17px;line-height:1.7;border-top:1px solid var(--line);padding:16px 0}.note{font-size:16px;line-height:1.7;color:var(--muted);margin:32px 0 16px;max-width:40em}.privacy .note{max-width:36em;margin:48px 0 16px;padding:24px 0 0;font-size:14px;line-height:1.7;background:transparent;border-top:1px solid rgba(255,255,255,.16);border-radius:0;color:rgba(255,255,255,.72)}.privacy .text-link{color:#fff;font-size:17px;font-weight:600}
.privacy .compare li{border-top:1px solid rgba(255,255,255,.16)}.privacy .compare ul{border-bottom:1px solid rgba(255,255,255,.16)}.privacy .compare-col h3{color:#a5bfff}.privacy .compare-col+.compare-col h3{color:rgba(255,255,255,.72)}.close{padding:96px 0}.close-inner{display:flex;justify-content:space-between;align-items:center;gap:64px}.close h2{margin-bottom:16px}.close p{max-width:47em;margin:0}.close .btn{flex-shrink:0}
.device{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 1px 2px rgba(19,32,44,.06),0 12px 32px rgba(19,32,44,.08);overflow:hidden}.device img{display:block;width:100%;height:auto}.device.phone{width:100%;max-width:300px;margin:0 auto;padding:6px;background:#13202c;border:0;border-radius:40px;box-shadow:0 0 0 1px rgba(19,32,44,.08),0 2px 4px rgba(19,32,44,.08),0 24px 48px -16px rgba(19,32,44,.32)}.device.phone img{border-radius:34px}
.split .device.phone{margin:0;justify-self:end}.split.reverse .device.phone{justify-self:start}
.privacy .device.phone{background:#2b3846;box-shadow:0 0 0 1px rgba(255,255,255,.10),0 32px 64px -24px rgba(0,0,0,.55)}
.site-footer{background:var(--surface);border-top:1px solid var(--line);padding:96px 0}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1.1fr 1.15fr;gap:64px}.footer-head{font-size:14px;line-height:1.6;font-weight:600;margin:0 0 16px}.footer-grid>div>a:not(.brand){display:block;font-size:14px;line-height:1.6;min-height:44px;padding:8px 0;color:var(--muted)}.footer-grid a:hover{color:var(--blue-deep)}.footer-brand p{font-size:14px;line-height:1.6;color:var(--muted);margin:16px 0 0;max-width:22em}.footer-grid small{display:block;font-size:14px;line-height:1.6;color:var(--muted)}.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:24px;border-top:1px solid var(--line);margin-top:32px;padding-top:24px;color:var(--muted);font-size:14px;line-height:1.6}.footer-bottom a{min-height:44px;display:inline-flex;align-items:center}
@media(max-width:1100px) and (min-width:701px){.wrap{width:calc(100% - 64px)}.bar-inner{gap:8px}.bar-inner>.nav,.bar-inner>.bar-cta{display:none}.menu{display:block}.lang{max-width:112px}.footer-grid{grid-template-columns:1.4fr 1fr;gap:32px}.footer-brand{grid-column:1/-1}}
@media(max-width:700px){.wrap{width:calc(100% - 32px)}h1{font-size:40px}h2{font-size:28px}h3{font-size:20px}.bar-inner{height:56px;gap:8px}.brand{font-size:20px}.bar-inner>.nav,.bar-inner>.bar-cta{display:none}.menu{display:block}.lang{max-width:104px}.hero{grid-template-columns:1fr;gap:32px;padding:64px 0}.feature,.privacy,.close{padding:64px 0}.split,.privacy-top,.compare{grid-template-columns:1fr;gap:32px}.split{display:flex;flex-direction:column;gap:0;align-items:stretch}.split .copy{display:contents}.split .kicker{order:1}.split h2{order:2}.split .device.phone{order:3;align-self:center;margin:8px 0 32px}.split .copy p:not(.kicker){order:4}.device.phone{max-width:264px;padding:5px;border-radius:36px}.device.phone img{border-radius:31px}.privacy-top{margin-bottom:32px}.close-inner{display:block}.close .btn{margin-top:24px}.kicker,.copy .kicker{margin-bottom:8px}.site-footer{padding:64px 0}.footer-grid{grid-template-columns:1fr 1fr;gap:32px}.footer-brand{grid-column:1/-1}.footer-bottom{flex-direction:column;align-items:flex-start;gap:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}.btn:hover{transform:none}}

h1:is(:lang(zh-CN),:lang(zh-TW),:lang(ja),:lang(ko)){line-height:1.2}:is(h2,h3):is(:lang(zh-CN),:lang(zh-TW),:lang(ja),:lang(ko)){line-height:1.3}
@media(max-width:1100px){.lang{order:1;margin-inline-start:auto}.menu{order:2;margin-inline-start:0}}
@media(min-width:701px){.footer-grid>div>a:not(.brand){min-height:32px;padding:4px 0}}

.define{max-width:32em;margin-bottom:24px;font-size:17px}.faq{padding:96px 0;background:var(--surface)}.faq h2{font-size:24px;margin-bottom:32px}.faq-item{max-width:48em;margin-bottom:32px}.faq-item:last-child{margin-bottom:0}.faq h3{font-size:24px;margin-bottom:16px}.faq p{font-size:17px;margin-bottom:0}
.lang{position:relative;flex-shrink:0}.lang summary{display:flex;align-items:center;min-height:44px;padding:8px;cursor:pointer;list-style:none}.lang summary::-webkit-details-marker{display:none}.language-panel{position:absolute;inset-inline-end:0;top:100%;z-index:6;min-width:176px;max-height:70vh;overflow:auto;padding:8px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius)}.language-panel a{display:block;min-height:44px;padding:8px}.language-panel a:hover,.language-panel a[aria-current]{color:var(--blue-deep)}
@media(max-width:700px){.faq{padding:64px 0}.faq h3{font-size:24px}}
.never{list-style:none;padding:0;margin:0 0 32px;max-width:27em}.never li{position:relative;padding-left:28px;font-size:17px;line-height:1.7;color:var(--ink);margin-bottom:8px}.never li::before{content:"";position:absolute;left:0;top:11px;width:16px;height:16px;border-radius:50%;background:var(--blue-deep);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 viewBox=%270 0 16 16%27%3E%3Cpath d=%27M3 8.5l3 3 7-7%27 fill=%27none%27 stroke=%27%23000%27 stroke-width=%272.2%27 stroke-linecap=%27round%27 stroke-linejoin=%27round%27/%3E%3C/svg%3E") center/16px no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 viewBox=%270 0 16 16%27%3E%3Cpath d=%27M3 8.5l3 3 7-7%27 fill=%27none%27 stroke=%27%23000%27 stroke-width=%272.2%27 stroke-linecap=%27round%27 stroke-linejoin=%27round%27/%3E%3C/svg%3E") center/16px no-repeat}[dir=rtl] .never li{padding-left:0;padding-right:28px}[dir=rtl] .never li::before{left:auto;right:0}@media(min-width:701px){.hero h1{font-size:56px;max-width:11em}}.hero h1:is(:lang(zh-CN),:lang(zh-TW),:lang(ja)){word-break:normal}

.lang summary{gap:6px}.lang summary svg{width:18px;height:18px;flex-shrink:0}.language-panel a{position:relative;padding-inline-start:32px}.language-panel a[aria-current]::before{content:"";position:absolute;inset-inline-start:8px;top:50%;margin-top:-8px;width:16px;height:16px;background:var(--blue-deep);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 viewBox=%270 0 16 16%27%3E%3Cpath d=%27M3 8.5l3 3 7-7%27 fill=%27none%27 stroke=%27%23000%27 stroke-width=%272.2%27 stroke-linecap=%27round%27 stroke-linejoin=%27round%27/%3E%3C/svg%3E") center/16px no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 viewBox=%270 0 16 16%27%3E%3Cpath d=%27M3 8.5l3 3 7-7%27 fill=%27none%27 stroke=%27%23000%27 stroke-width=%272.2%27 stroke-linecap=%27round%27 stroke-linejoin=%27round%27/%3E%3C/svg%3E") center/16px no-repeat}.compare{grid-template-columns:1fr;max-width:36em}

:root{--blue-tint:#e6edfc}
.hero-band{background:var(--blue-tint)}.hero-band .hero{padding:56px 0 0;align-items:start}.hero-band .hero>div{padding-bottom:56px}
@media(min-width:701px){.hero-band .hero>div{padding-bottom:40px}.hero-band .hero-art{align-self:end;margin-bottom:-64px}.hero-band .device.phone{max-width:340px}.hero-band+.feature{padding-top:160px}}
@media(max-width:700px){.hero-band .hero{gap:0;padding:40px 0 48px}.hero-band .hero>div{display:contents}.hero .kicker{order:1}.hero h1{order:2}.hero .define{order:3}.hero .hero-actions{order:4;margin-bottom:40px}.hero .hero-art{order:5;margin:0 auto 40px}.hero .never{order:6}.hero .lead{order:7;margin-bottom:0}}
.faq-item{border-top:1px solid var(--line)}.faq-item:last-of-type{border-bottom:1px solid var(--line)}.faq-item summary{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:44px;padding:20px 0;cursor:pointer;list-style:none}.faq-item summary::-webkit-details-marker{display:none}.faq-item h3{margin:0;font-size:20px;line-height:1.35}.faq-item summary::after{content:"+";flex-shrink:0;font-size:28px;font-weight:300;line-height:1;color:var(--blue-deep)}.faq-item[open] summary::after{content:"\2013"}.faq-item p{margin:0 0 24px;max-width:40em}