:root{
  color-scheme:light;
  --page:#f6f8fc;
  --surface:#fff;
  --ink:#101828;
  --muted:#667085;
  --line:#e7eaf0;
  --blue:#1677ff;
  --blue-dark:#095fe0;
  --blue-soft:#eaf3ff;
  --shadow:0 24px 70px rgba(25,43,79,.12);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{
  margin:0;min-width:320px;overflow-x:hidden;background:var(--page);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.site-header,main,footer{width:min(1080px,calc(100% - 32px));margin:0 auto}

.site-header{
  position:relative;z-index:10;display:flex;align-items:center;justify-content:space-between;
  min-height:72px;padding:12px 0;
}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:750;letter-spacing:-.02em}
.brand img{width:40px;height:40px;border-radius:11px;box-shadow:0 8px 18px rgba(16,24,40,.12)}
.header-action{
  display:inline-flex;align-items:center;justify-content:center;min-width:72px;min-height:44px;padding:0 17px;
  border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.8);font-size:14px;font-weight:700;
}

.hero{display:grid;grid-template-columns:1fr;gap:42px;align-items:center;padding:42px 0 70px}
.eyebrow{margin:0 0 12px;color:var(--blue);font-size:12px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}
h1,h2,h3,p{margin-top:0}
h1{margin-bottom:20px;font-size:clamp(44px,13vw,68px);line-height:1.04;letter-spacing:-.055em;font-weight:800}
h1 span{color:var(--blue)}
.hero-lead{max-width:520px;margin-bottom:0;color:var(--muted);font-size:17px;line-height:1.75}
.download-panel{display:grid;gap:12px;margin-top:30px}
.download-button{
  display:flex;align-items:center;justify-content:center;gap:13px;width:100%;min-height:64px;padding:10px 18px;
  border-radius:17px;background:var(--ink);color:#fff;box-shadow:0 16px 34px rgba(16,24,40,.18);
}
.download-button svg{width:25px;height:25px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.download-button span{display:grid;gap:2px;text-align:left}
.download-button strong{font-size:16px}
.download-button small{color:#cdd3df;font-size:11px;font-weight:500}
.ios-state{
  display:flex;align-items:center;justify-content:space-between;min-height:52px;padding:0 17px;border:1px solid var(--line);
  border-radius:15px;background:var(--surface);color:var(--muted);font-size:13px;
}
.ios-state strong{color:#344054;font-size:13px}

.phone{
  position:relative;width:min(300px,88vw);min-height:555px;margin:0 auto;padding:14px 14px 18px;
  overflow:hidden;border:7px solid #111827;border-radius:42px;background:#fff;box-shadow:var(--shadow);
}
.phone::before{content:"";position:absolute;top:7px;left:50%;width:72px;height:20px;transform:translateX(-50%);border-radius:999px;background:#111827}
.phone-bar{display:flex;justify-content:space-between;padding:4px 7px 22px;font-size:10px;font-weight:700}
.phone-status{font-size:8px;letter-spacing:2px}
.app-head{display:flex;align-items:flex-end;justify-content:space-between;padding:0 4px 15px}
.app-head div{display:grid;gap:3px}.app-head small{color:#98a2b3;font-size:10px}.app-head strong{font-size:25px;letter-spacing:-.04em}
.compose{display:grid;width:34px;height:34px;place-items:center;border-radius:50%;background:var(--blue);color:#fff;font-size:23px;font-weight:300}
.search{margin-bottom:10px;padding:9px 12px;border-radius:11px;background:#f2f4f7;color:#98a2b3;font-size:11px}
.chat-list{display:grid}
.chat-row{display:grid;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:10px;padding:13px 3px;border-bottom:1px solid #f0f1f3}
.avatar{display:grid;width:44px;height:44px;place-items:center;border-radius:15px;color:#fff;font-size:15px;font-weight:750}
.avatar-blue{background:linear-gradient(145deg,#65a5ff,#1677ff)}
.avatar-dark{background:linear-gradient(145deg,#344054,#101828)}
.avatar-green{background:linear-gradient(145deg,#42c9a5,#15977b)}
.chat-copy{display:grid;min-width:0;gap:5px}.chat-copy strong{font-size:13px}.chat-copy small{overflow:hidden;color:#98a2b3;font-size:9px;text-overflow:ellipsis;white-space:nowrap}
.chat-time{align-self:start;padding-top:2px;color:#b1b7c1;font-size:8px}
.phone-tabs{position:absolute;right:0;bottom:0;left:0;display:grid;grid-template-columns:repeat(3,1fr);padding:10px 16px 12px;border-top:1px solid #f0f1f3;background:rgba(255,255,255,.95)}
.phone-tabs span{display:grid;place-items:center;gap:4px;color:#b2b8c2;font-size:11px}.phone-tabs small{font-size:8px}.phone-tabs .active{color:var(--blue)}

.features{padding:72px 0;border-top:1px solid var(--line)}
.section-copy h2{max-width:620px;margin-bottom:0;font-size:clamp(32px,9vw,48px);line-height:1.12;letter-spacing:-.045em}
.feature-list{display:grid;gap:12px;margin-top:32px}
.feature-list article{padding:24px;border:1px solid var(--line);border-radius:22px;background:var(--surface)}
.feature-icon{display:grid;width:40px;height:40px;margin-bottom:35px;place-items:center;border-radius:13px;background:var(--blue-soft);color:var(--blue);font-size:19px;font-weight:800}
.feature-list h3{margin-bottom:8px;font-size:19px;letter-spacing:-.02em}
.feature-list p{margin-bottom:0;color:var(--muted);font-size:14px;line-height:1.7}

.support-card{
  display:grid;gap:24px;margin-bottom:20px;padding:28px;border-radius:26px;background:var(--ink);color:#fff;
}
.support-card h2{margin-bottom:8px;font-size:30px;letter-spacing:-.04em}
.support-card p:not(.eyebrow){margin-bottom:0;color:#aeb7c6;line-height:1.6}
.support-card a{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 20px;border-radius:14px;background:#fff;color:var(--ink);font-size:14px;font-weight:750}

footer{display:grid;gap:18px;padding:30px 0 calc(30px + env(safe-area-inset-bottom));color:var(--muted);font-size:12px}
footer>div{display:flex;align-items:center;gap:10px}footer strong{color:var(--ink);font-size:14px}footer nav{display:flex;flex-wrap:wrap;gap:16px 20px}

@media(min-width:700px){
  .download-panel{grid-template-columns:minmax(250px,320px) minmax(190px,230px)}
  .feature-list{grid-template-columns:repeat(3,minmax(0,1fr))}
  .support-card{grid-template-columns:1fr auto;align-items:center;padding:38px}.support-card a{min-width:160px}
  footer{grid-template-columns:1fr auto;align-items:center}
}

@media(min-width:900px){
  .site-header{min-height:84px}
  .hero{grid-template-columns:minmax(0,1fr) 390px;gap:70px;min-height:690px;padding:54px 0 86px}
  h1{font-size:70px}.phone{width:310px;transform:rotate(2deg)}
  .features{padding:90px 0}.feature-list{margin-top:42px}
}

@media(max-width:420px){
  .site-header,main,footer{width:min(100% - 24px,1080px)}
  .site-header{min-height:64px}.brand img{width:36px;height:36px;border-radius:10px}.brand{font-size:17px}
  .hero{gap:36px;padding:32px 0 58px}h1{font-size:43px}.hero-lead{font-size:15px}
  .phone{min-height:525px}.features{padding:58px 0}.feature-list article{padding:21px}.feature-icon{margin-bottom:28px}
  .support-card{padding:24px}
}

@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.download-button,.phone{transform:none!important}}