:root{
  --primary:#FF5C8A;
  --primary-deep:#F03D74;
  --primary-soft:#FFE4EE;
  --deep:#2A1A3D;
  --text:#3E2C50;
  --muted:#6F5E7C;
  --bg:#FFF9FB;
  --bg-soft:#FFF0F6;
  --card:#FFFFFF;
  --border:#F4D8E5;
  --green:#2EC57E;
  --radius:18px;
  --shadow:0 10px 30px rgba(240,61,116,.08);
  --shadow-hover:0 18px 42px rgba(240,61,116,.16);
  --nav-h:70px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}

.container{max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:84px 0}
.persona,.step-card,.feature-card,.review-card,.privacy-card,.vs-card,.update-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  transition:transform .25s,box-shadow .25s;
}
.persona:hover,.step-card:hover,.feature-card:hover,.review-card:hover,.privacy-card:hover,.vs-card:hover{
  transform:translateY(-6px);box-shadow:var(--shadow-hover);
}
.step-card,.feature-card,.review-card,.privacy-card,.persona,.vs-card{min-width:0}

.sec-title{font-size:32px;font-weight:800;color:var(--deep);text-align:center;line-height:1.35}
.sec-title.light{color:#fff}
.sec-sub{text-align:center;color:var(--muted);margin-top:10px;font-size:16px}
.sec-sub.light{color:rgba(255,255,255,.72)}
.ver-badge{
  display:inline-block;
  background:var(--primary-soft);
  color:var(--primary-deep);
  font-size:14px;
  font-weight:700;
  padding:4px 14px;
  border-radius:999px;
  margin-left:8px;
  border:1px solid var(--border);
  vertical-align:middle;
}
.ver-badge.big{font-size:16px;padding:6px 18px;margin-left:10px}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;
  border-radius:999px;
  padding:14px 34px;
  font-size:16px;
  font-weight:600;
  box-shadow:var(--shadow);
  transition:transform .25s,box-shadow .25s;
}
.btn:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}

.nav{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  height:var(--nav-h);
  background:rgba(255,255,255,.92);
  transition:box-shadow .3s;
}
.nav.scrolled{box-shadow:0 6px 20px rgba(42,26,61,.08)}
.nav-inner{
  height:var(--nav-h);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.logo{display:flex;align-items:center;gap:8px;font-size:22px;font-weight:800;color:var(--deep);padding:11px 0}
.logo:hover{color:var(--primary-deep)}
.menu{display:flex;gap:30px}
.menu a{font-size:15px;color:var(--text);padding:10px 2px;transition:color .2s}
.menu a:hover{color:var(--primary)}
.nav-dl{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;
  border-radius:999px;
  padding:0 22px;
  font-size:14px;
  font-weight:600;
  transition:transform .25s,box-shadow .25s;
}
.nav-dl:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}

.hero{
  padding:calc(var(--nav-h) + 64px) 0 84px;
  background:linear-gradient(180deg,var(--bg-soft),var(--bg));
}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-left h1{font-size:42px;color:var(--deep);line-height:1.25;font-weight:900}
.hero-desc{margin:20px 0 30px;font-size:17px;color:var(--text);max-width:540px}
.hero-btn{font-size:17px;padding:16px 40px}
.personas{margin-top:46px}
.personas-title{font-size:15px;color:var(--muted);margin-bottom:16px}
.personas-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;max-width:640px}
.persona{padding:12px 8px;text-align:center}
.persona img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:14px}
.persona span{display:block;margin-top:8px;font-size:13px;font-weight:600;color:var(--text)}

.chat{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:24px;
  box-shadow:0 24px 60px rgba(240,61,116,.14);
  overflow:hidden;
  max-width:400px;
  margin-left:auto;
}
.chat-head{
  display:flex;
  align-items:center;
  gap:12px;
  padding:14px 16px;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
}
.chat-head img{width:44px;height:44px;border-radius:50%;object-fit:cover;border:2px solid #fff}
.chat-user{display:flex;flex-direction:column;min-width:0}
.chat-name{font-size:15px;font-weight:700;color:#fff;line-height:1.4}
.chat-state{font-size:12px;color:#fff;opacity:.95;line-height:1.4}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--green);margin-right:5px;vertical-align:1px}
.chat-body{
  padding:16px;
  min-height:290px;
  max-height:370px;
  overflow-y:auto;
  background:var(--bg);
  display:flex;
  flex-direction:column;
  gap:12px;
}
.msg{display:flex;gap:8px;max-width:84%;align-items:flex-end}
.msg .msg-avatar img{width:28px;height:28px;border-radius:50%;object-fit:cover}
.msg p{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:14px;
  border-bottom-left-radius:4px;
  padding:10px 14px;
  font-size:14px;
  line-height:1.6;
  color:var(--text);
}
.msg.user{margin-left:auto;flex-direction:row-reverse}
.msg.user p{
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;
  border:none;
  border-bottom-right-radius:4px;
}
.chat-input{
  display:flex;
  gap:8px;
  padding:12px 14px;
  border-top:1px solid var(--border);
  background:var(--card);
}
.chat-input input{
  flex:1;
  height:44px;
  border:1px solid var(--border);
  border-radius:999px;
  padding:0 16px;
  font-size:13px;
  color:var(--text);
  background:var(--bg);
  min-width:0;
}
.chat-input input:focus{outline:none;border-color:var(--primary)}
.chat-input button{
  height:44px;
  padding:0 20px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;
  font-size:14px;
  font-weight:600;
  min-width:70px;
  transition:opacity .3s;
}
.chat-input button.disabled{background:#D8C6D0;cursor:not-allowed}

.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.step-card{padding:36px 28px;text-align:center;position:relative}
.step-num{
  position:absolute;
  top:18px;right:20px;
  font-size:13px;
  font-weight:800;
  color:var(--primary-deep);
  background:var(--primary-soft);
  padding:4px 12px;
  border-radius:999px;
}
.step-ico{
  width:64px;height:64px;
  border-radius:18px;
  background:var(--primary-soft);
  display:inline-flex;
  align-items:center;
  justify-content:center;
}
.step-card h3{font-size:20px;color:var(--deep);margin:18px 0 10px}
.step-card p{font-size:15px;color:var(--muted)}

.product{background:var(--bg-soft)}
.product-inner{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.product-text .sec-title{text-align:left}
.product-text>p{margin:16px 0 26px;font-size:16px;color:var(--text)}
.check-list li{display:flex;gap:10px;align-items:flex-start;font-size:16px;color:var(--text);padding:8px 0}
.check-list svg{flex:none;margin-top:4px}
.product-img img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%}

.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px}
.feature-card{padding:30px 26px}
.f-icon,.p-icon{
  width:56px;height:56px;
  border-radius:16px;
  background:var(--primary-soft);
  display:inline-flex;
  align-items:center;
  justify-content:center;
}
.f-icon{margin-bottom:20px}
.feature-card h3{font-size:20px;color:var(--deep);margin-bottom:12px}
.f-pain{
  display:inline-block;
  font-size:14px;
  color:var(--primary-deep);
  background:var(--primary-soft);
  padding:5px 12px;
  border-radius:999px;
  margin-bottom:12px;
  line-height:1.6;
}
.f-desc{font-size:15px;color:var(--muted)}

.compare{background:var(--bg-soft)}
.compare-wrap{margin-top:48px}
.compare-box{
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow);
  background:var(--card);
}
.compare-table{width:100%;table-layout:fixed;border-collapse:collapse}
.compare-table th,.compare-table td{padding:14px 16px;text-align:center;font-size:15px;border-bottom:1px solid var(--border)}
.compare-table th{background:var(--deep);color:#fff;font-weight:600}
.compare-table th.hl{background:linear-gradient(90deg,var(--primary),var(--primary-deep))}
.compare-table td{color:var(--text)}
.compare-table td:first-child{text-align:left;font-weight:600;color:var(--deep);background:var(--bg-soft)}
.compare-table td.hl{background:var(--primary-soft);color:var(--primary-deep);font-weight:600}
.compare-table tr:last-child td{border-bottom:none}
.compare-hint{display:none;text-align:center;color:var(--muted);font-size:13px;margin-top:14px}

.scene-list{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:12px 32px;
  max-width:920px;
  margin:44px auto 60px;
}
.scene-list li{display:flex;gap:12px;align-items:flex-start;font-size:16px;color:var(--text);padding:6px 0}
.scene-list svg{flex:none;margin-top:5px}
.vs{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:stretch}
.vs-card{padding:36px 30px}
.vs-before h3{font-size:20px;color:var(--deep);margin-bottom:14px}
.vs-before p{font-size:15px;color:var(--muted)}
.vs-after{
  background:linear-gradient(160deg,var(--primary-soft),var(--card));
  border-color:var(--primary);
}
.vs-after h3{font-size:20px;color:var(--primary-deep);margin-bottom:14px}
.vs-after p{font-size:15px;color:var(--text)}
.vs-badge{
  align-self:center;
  width:58px;height:58px;
  border-radius:50%;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;
  font-size:16px;
  font-weight:900;
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow:var(--shadow-hover);
}

.data{background:linear-gradient(135deg,var(--deep),#3D2560)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:56px;text-align:center}
.stat-num{font-size:44px;font-weight:900;color:#fff;line-height:1.2}
.stat-num span{color:var(--primary)}
.stat-label{color:rgba(255,255,255,.75);margin-top:8px;font-size:15px}

.custom{background:var(--bg-soft)}
.custom-inner{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.custom-img img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%}
.custom-text .sec-title{text-align:left}
.custom-text>p{margin:16px 0 26px;font-size:16px;color:var(--text)}
.custom-btn{margin-top:8px}

.reviews-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px}
.review-card{padding:26px}
.review-top{display:flex;gap:12px;align-items:center;margin-bottom:14px}
.review-avatar{
  width:44px;height:44px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  color:#fff;
  font-size:18px;
  font-weight:700;
  display:flex;
  align-items:center;
  justify-content:center;
  flex:none;
}
.review-card:nth-child(3n+2) .review-avatar{background:linear-gradient(135deg,#9B6BD9,#6E4BB8)}
.review-card:nth-child(3n) .review-avatar{background:linear-gradient(135deg,#FF9A6B,#F05A5A)}
.review-name{font-size:15px;font-weight:700;color:var(--deep)}
.review-stars{color:#FFB800;font-size:13px;letter-spacing:2px}
.review-text{font-size:14px;color:var(--text);line-height:1.75}

.privacy{background:var(--bg-soft)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px}
.privacy-card{padding:30px 26px;text-align:center}
.p-icon{margin-bottom:18px}
.privacy-card h3{font-size:18px;color:var(--deep);margin-bottom:10px}
.privacy-card p{font-size:14px;color:var(--muted)}

.update-card{max-width:760px;margin:48px auto 0;padding:40px}
.update-head{display:flex;align-items:center;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.update-date{color:var(--muted);font-size:15px}
.update-list li{
  position:relative;
  padding:11px 0 11px 26px;
  font-size:15px;
  color:var(--text);
  border-bottom:1px dashed var(--border);
}
.update-list li::before{
  content:"";
  position:absolute;
  left:6px;top:20px;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--primary);
}
.update-list li:last-child{border-bottom:none}

.faq{background:var(--bg-soft)}
.faq-list{max-width:800px;margin:48px auto 0}
.faq-item{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  margin-bottom:14px;
  overflow:hidden;
  transition:box-shadow .25s;
}
.faq-item.open{box-shadow:var(--shadow)}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 22px;
  font-size:16px;
  font-weight:600;
  color:var(--deep);
  text-align:left;
}
.faq-q svg{flex:none;color:var(--primary);transition:transform .3s}
.faq-item.open .faq-q svg{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 22px 18px;font-size:15px;color:var(--muted)}

.download{background:linear-gradient(180deg,var(--bg-soft),var(--bg));text-align:center}
.download h1{font-size:38px;color:var(--deep);font-weight:900}
.dl-meta{margin-top:14px;font-size:14px;color:var(--muted)}
.dl-btns{display:flex;justify-content:center;gap:20px;margin:32px 0 18px}
.dl-btn{font-size:17px;padding:16px 40px}
.dl-tip{font-size:15px;color:var(--muted)}

.footer{background:var(--deep);color:rgba(255,255,255,.75);padding:34px 0;text-align:center;font-size:14px}
.footer a{color:#fff;font-weight:700;transition:color .2s}
.footer a:hover{color:var(--primary)}

.to-top{
  position:fixed;
  right:28px;bottom:32px;
  z-index:99;
  width:48px;height:48px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow:var(--shadow-hover);
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity .3s,transform .3s,visibility .3s;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{transform:translateY(-3px)}

@media (max-width:1100px){
  .personas-grid{grid-template-columns:repeat(3,1fr);max-width:none}
  .features-grid,.privacy-grid,.reviews-grid{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr);gap:40px 24px}
  .hero-left h1{font-size:36px}
  .sec-title{font-size:29px}
  .hero-inner{gap:40px}
}

@media (max-width:900px){
  .menu{display:none}
  .hero{padding:calc(var(--nav-h) + 48px) 0 64px}
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero .chat{margin:0 auto}
  .product-inner,.custom-inner{grid-template-columns:1fr;gap:36px}
  .product-text .sec-title,.custom-text .sec-title{text-align:center}
  .product-img img,.custom-img img{margin:0 auto;max-width:520px;width:100%}
  .vs{grid-template-columns:1fr;gap:16px}
  .vs-badge{margin:0 auto}
  .scene-list{grid-template-columns:1fr}
  .compare-table th,.compare-table td{padding:12px 12px;font-size:14px}
}

@media (max-width:768px){
  .container{padding:0 20px}
  section{padding:64px 0}
  .compare-box{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .compare-table{min-width:640px}
  .compare-hint{display:block}
  .dl-btns{flex-direction:column;gap:14px;margin:28px 0 16px}
  .dl-btn{width:100%;padding:16px 20px;font-size:16px}
  .dl-meta{font-size:12px;white-space:nowrap}
  .hero-left h1{font-size:30px}
  .hero-desc{font-size:16px}
  .nav-dl{padding:9px 16px;font-size:13px}
  .download h1{font-size:30px}
  .update-card{padding:28px 22px}
}

@media (max-width:640px){
  .features-grid,.reviews-grid,.privacy-grid,.steps-grid{grid-template-columns:1fr}
  .chat-body{min-height:220px;max-height:300px}
  .chat-input input{font-size:16px}
  .stats{grid-template-columns:repeat(2,1fr);gap:32px 16px}
  .sec-title{font-size:25px}
  .stat-num{font-size:34px}
  .hero-btn{width:100%}
  .scene-list li{font-size:15px}
  .to-top{right:16px;bottom:20px;width:44px;height:44px}
}