:root{--green:#2EAD6A;--green-2:#279A5E;--green-ink:#1B7A4A;--mint:#EBF6EF;--mint-2:#D4EDDE;--ink:#16201B;--ink-2:#3F4A44;--muted:#5F6A65;--line:#E3E9E5;--paper:#F4F6F5;
  --r:28px;--shadow:0 24px 60px rgba(18,32,25,.16),0 4px 14px rgba(18,32,25,.08);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-zh:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:#fff;color:var(--ink);font:17px/1.6 var(--font);-webkit-font-smoothing:antialiased}
html[lang^="zh"] body{font-family:var(--font-zh)}
img{max-width:100%;display:block;height:auto}
a{color:inherit}
.wrap{width:min(1180px,100% - 40px);margin-inline:auto}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.skip{position:absolute;left:12px;top:-60px;background:var(--ink);color:#fff;padding:10px 14px;border-radius:10px;z-index:99}
.skip:focus{top:12px}
:focus-visible{outline:3px solid var(--green);outline-offset:3px;border-radius:6px}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--green-ink);margin:0 0 14px}
html[lang^="zh"] .eyebrow{letter-spacing:.14em;font-size:14px}
.eyebrow.dark{color:var(--ink)}
h1,h2,h3{margin:0;letter-spacing:-.035em;line-height:1.04}
html[lang^="zh"] h1,html[lang^="zh"] h2,html[lang^="zh"] h3{letter-spacing:0;line-height:1.2;font-weight:600}
h1{font-size:clamp(46px,7.4vw,96px);font-weight:780}
h1 em,h2 em{font-style:normal;color:var(--green-2)}
h2{font-size:clamp(34px,4.6vw,58px);font-weight:760}
h3{font-size:22px;font-weight:700;letter-spacing:-.015em}
.muted{color:var(--muted)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 26px;border-radius:999px;background:var(--green);color:var(--ink);font-weight:700;text-decoration:none;border:0;font-size:16px;cursor:pointer;transition:background .2s,transform .2s}
.btn:hover{background:#3DBF7A}
.btn.small{min-height:42px;padding:0 18px;font-size:15px}
.btn.ghost{background:transparent;box-shadow:inset 0 0 0 2px var(--ink)}
.btn.ghost:hover{background:var(--ink);color:#fff}
.btn.dark{background:var(--ink);color:#fff}
.btn.dark:hover{background:#2a3631}
.btn.ghost-dark{background:transparent;box-shadow:inset 0 0 0 2px var(--ink);color:var(--ink)}

/* header */
header.site{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.9);backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid transparent;transition:border-color .2s}
header.site.scrolled{border-color:var(--line)}
.bar{display:flex;align-items:center;gap:24px;height:72px}
.brand{display:flex;align-items:center;flex-shrink:0;text-decoration:none}
.brand-logo{width:176px;height:auto;object-fit:contain}
nav{display:flex;gap:26px;margin-left:auto}
nav a{text-decoration:none;font-weight:600;font-size:15px;color:var(--ink-2)}
nav a:hover{color:var(--ink)}
.actions{display:flex;gap:10px;align-items:center}
.lang{min-height:42px;min-width:56px;padding:0 14px;border-radius:999px;border:1.5px solid var(--line);background:#fff;font:600 15px var(--font-zh);color:var(--ink);cursor:pointer}
.lang:hover{border-color:var(--ink)}

/* hero */
.hero{padding:40px 0 32px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.lede{font-size:21px;line-height:1.55;color:var(--ink-2);max-width:540px;margin:26px 0 34px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.hero-visual{position:relative;border-radius:36px;overflow:hidden;aspect-ratio:870/896;background:var(--paper)}
.hero-visual img{width:100%;height:100%;object-fit:cover}
.pings{position:absolute;left:18px;top:18px;margin:0;padding:0;list-style:none;display:grid;gap:10px;width:min(330px,72%)}
.pings li{background:rgba(255,255,255,.95);border-radius:20px;padding:12px 16px 12px 54px;position:relative;box-shadow:var(--shadow);font-size:15px;line-height:1.35}
.pings li::before{content:"";position:absolute;left:14px;top:14px;width:28px;height:28px;border-radius:8px;background:var(--ink) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M5 4h14a3 3 0 0 1 3 3v8a3 3 0 0 1-3 3h-7l-5 4v-4H5a3 3 0 0 1-3-3V7a3 3 0 0 1 3-3z' fill='white'/%3E%3C/svg%3E") center/16px no-repeat}
.pings b{display:block;font-size:12.5px}
.pings li:nth-child(2){opacity:.94}.pings li:nth-child(3){opacity:.86}
.ai-label{position:absolute;left:16px;bottom:16px;background:rgba(255,255,255,.92);color:var(--ink-2);font-size:12.5px;font-weight:600;padding:6px 12px 6px 24px;border-radius:999px}
.ai-label::before{content:"";position:absolute;left:11px;top:50%;width:7px;height:7px;margin-top:-3.5px;border-radius:50%;background:var(--green)}
@media (prefers-reduced-motion:no-preference){
  .pings li{animation:ping .6s cubic-bezier(.2,.9,.25,1.1) both}
  .pings li:nth-child(2){animation-delay:.5s}.pings li:nth-child(3){animation-delay:1s}
  @keyframes ping{from{opacity:0;transform:translateY(14px) scale(.96)}}
}

/* services */
.services{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;padding:40px 0 96px}
.services article{border-top:3px solid var(--ink);padding-top:22px}
.services .num{font-size:14px;font-weight:750;color:var(--green-ink);font-family:var(--font)}
.services h3{margin:8px 0 10px}
.services p{color:var(--ink-2);margin:0}

/* examples */
.examples{background:var(--mint);padding:96px 0}
.examples .head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:34px;flex-wrap:wrap}
.tabs{display:inline-flex;background:#fff;border-radius:999px;padding:6px;gap:4px;margin-bottom:24px;box-shadow:0 2px 0 rgba(18,32,25,.04)}
.tabs button{min-height:46px;padding:0 22px;border-radius:999px;border:0;background:transparent;font:650 16px var(--font);color:var(--ink-2);cursor:pointer}
html[lang^="zh"] .tabs button{font-family:var(--font-zh)}
.tabs button[aria-selected="true"]{background:var(--ink);color:#fff}
.demo{display:grid;grid-template-columns:1.1fr .9fr;background:#fff;border-radius:36px;overflow:hidden;box-shadow:var(--shadow)}
.demo-photo{margin:0;position:relative;min-height:420px}
.demo-photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.demo-body{padding:44px 44px 40px}
.demo-body h3{font-size:30px;letter-spacing:-.03em}
.demo-body #demo-desc{margin:10px 0 22px}
.phone{background:var(--paper);border-radius:26px;padding:16px 16px 18px}
.phone-top{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;text-align:center}
#msgs{display:flex;flex-direction:column;gap:10px}
.bubble{max-width:86%;padding:11px 16px;border-radius:20px;font-size:15.5px;line-height:1.4;background:#fff;border-bottom-left-radius:6px}
.bubble.out{align-self:flex-end;background:var(--green);border-bottom-left-radius:20px;border-bottom-right-radius:6px}
@media (prefers-reduced-motion:no-preference){.bubble{animation:ping .45s both}.bubble:nth-child(2){animation-delay:.35s}.bubble:nth-child(3){animation-delay:.7s}}
.result{margin:14px 0 0;font-weight:700;font-size:15px;color:var(--green-ink)}
.rule{margin:18px 0 0;font-size:14.5px;color:var(--muted);padding-left:14px;border-left:3px solid var(--green)}

/* control */
.control{display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;align-items:center;padding:110px 0}
.control-photo{margin:0;position:relative;border-radius:36px;overflow:hidden}
.handoff{position:absolute;right:16px;top:16px;background:var(--ink);color:#fff;font-weight:700;padding:12px 18px;border-radius:999px;font-size:15px}
.checks{list-style:none;padding:0;margin:28px 0 0}
.checks li{padding:16px 0 16px 44px;border-top:1px solid var(--line);position:relative;font-size:18px;font-weight:550}
.checks li::before{content:"";position:absolute;left:0;top:15px;width:28px;height:28px;border-radius:50%;background:var(--green) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4 8-9' fill='none' stroke='%2316201B' stroke-width='2.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/18px no-repeat}

/* how */
.how{background:var(--paper);padding:96px 0}
.steps{list-style:none;padding:0;margin:40px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:s}
.steps li{background:#fff;border-radius:var(--r);padding:28px 24px}
.steps span{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--green);font-weight:780;margin-bottom:22px;font-family:var(--font)}
.steps p{color:var(--ink-2);margin:10px 0 0;font-size:15.5px}

/* faq */
.faq{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px;padding:110px 0}
.qa details{border-top:1px solid var(--line)}
.qa details:last-child{border-bottom:1px solid var(--line)}
.qa summary{cursor:pointer;list-style:none;padding:22px 44px 22px 0;font-weight:650;font-size:19px;position:relative}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";position:absolute;right:6px;top:16px;font-size:26px;font-weight:400;color:var(--green-ink)}
.qa details[open] summary::after{content:"–"}
.qa p{margin:0 0 22px;color:var(--ink-2);max-width:640px}

/* talk */
.talk{background:var(--green);padding:96px 0}
.talk-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.talk p{font-size:18px;color:#1d2a23;max-width:480px}
.mail{display:inline-block;margin-top:10px;font-weight:750;font-size:20px;text-decoration-thickness:2px;text-underline-offset:5px}
form{background:#fff;border-radius:32px;padding:32px;box-shadow:var(--shadow)}
label{display:block;font-weight:650;font-size:15px;margin:0 0 8px}
input,textarea{width:100%;font:16px/1.45 var(--font);color:var(--ink);border:1.5px solid var(--line);border-radius:16px;padding:13px 15px;margin-bottom:18px;background:#fff}
html[lang^="zh"] input,html[lang^="zh"] textarea{font-family:var(--font-zh)}
input:focus,textarea:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 4px var(--mint-2)}
textarea[readonly]{background:var(--paper)}
.micro{font-size:13.5px;color:var(--muted);margin:12px 0 0}
.error{color:#B42318;font-weight:600;font-size:14.5px;margin:-6px 0 14px}
#draft{margin-top:24px;padding-top:22px;border-top:1px solid var(--line)}
.draft-actions{display:flex;gap:10px;flex-wrap:wrap}

/* footer */
.foot{padding:48px 0 56px;display:grid;gap:10px}
.foot .brand-logo{width:200px;margin-bottom:8px}
.foot p{margin:0;font-weight:600}
.foot small{color:var(--muted);max-width:720px;line-height:1.5}

/* responsive */
@media (max-width:980px){
  .hero-grid,.control,.faq,.talk-grid{grid-template-columns:1fr}
  .demo{grid-template-columns:1fr}.demo-photo{min-height:300px}
  .steps{grid-template-columns:1fr 1fr}
  nav{display:none}.actions{margin-left:auto}
  .control{padding:80px 0;gap:36px}.faq{gap:20px;padding:80px 0}
}
@media (max-width:640px){
  body{font-size:16px}
  .bar{height:64px;gap:12px}.site .brand-logo{width:144px}
  .hero{padding:20px 0 12px}.hero-grid{gap:28px}
  .lede{font-size:18px;margin:18px 0 26px}
  .hero-visual{border-radius:26px;aspect-ratio:4/4.4}
  .pings li{font-size:13.5px;padding:10px 12px 10px 48px}.pings li::before{left:12px;top:12px;width:26px;height:26px}
  .services{grid-template-columns:1fr;gap:28px;padding:36px 0 64px}
  .examples,.how,.talk{padding:64px 0}
  .tabs{display:flex;width:100%}.tabs button{flex:1;padding:0 8px;font-size:15px}
  .demo{border-radius:26px}.demo-photo{min-height:230px}.demo-body{padding:26px 20px 24px}.demo-body h3{font-size:24px}
  .steps{grid-template-columns:1fr}
  form{padding:22px;border-radius:24px}
  .btn{width:100%}.cta-row .btn{width:auto;flex:1}
  .actions .btn.small{width:auto}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

/* refinements */
h1{font-size:clamp(44px,6.2vw,84px)}
.examples .head{display:block}
.examples .head .eyebrow{margin-bottom:14px}
p,li,summary,h2,h3{text-wrap:pretty}
@media (max-width:640px){.pings li:nth-child(3){display:none}.pings{width:min(300px,78%)}}
@media (max-width:400px){
  h1{font-size:40px}
  .actions .btn.small{display:none}
  .btn{white-space:nowrap}
  .cta-row .btn{padding:0 16px}
}

/* hero: keep both faces clear — two notifications sit over the counter, label moves to the top */
.pings{top:auto;bottom:18px;left:18px;width:min(330px,62%)}
.pings li:nth-child(3){display:none}
.hero-visual .ai-label{top:16px;bottom:auto}
/* anchors land below the sticky header; #top returns to the clean opening view */
[id]{scroll-margin-top:88px}
#top{scroll-margin-top:200px}
@media (max-width:640px){.pings{width:min(300px,78%);bottom:14px;left:14px}}
@media (max-width:640px){.pings li:nth-child(2){display:none}}