: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;
  --star:#FFB84D;
  --radius:18px;
  --shadow:0 10px 30px rgba(240,61,116,.08);
  --shadow-hover:0 18px 42px rgba(240,61,116,.16);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:70px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:80px 0}
h1{font-size:46px;line-height:1.25;color:var(--deep);font-weight:800}
h2{font-size:34px;line-height:1.3;color:var(--deep);font-weight:800;text-align:center}
.sub{text-align:center;color:var(--muted);margin-top:12px;font-size:15px}
.ver{display:inline-block;margin-left:10px;font-size:15px;font-weight:600;color:var(--primary);background:var(--primary-soft);border:1px solid var(--border);padding:3px 12px;border-radius:999px;vertical-align:middle}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.btn{display:inline-block;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;text-decoration:none;font-weight:600;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}

.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,249,251,.92);border-bottom:1px solid transparent;transition:border-color .25s,box-shadow .25s}
.nav.scrolled{border-bottom-color:var(--border);box-shadow:0 6px 20px rgba(240,61,116,.08)}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:30px}
.logo{display:flex;align-items:center;gap:8px;font-size:22px;font-weight:800;color:var(--deep);text-decoration:none;flex:none}
.logo svg{width:24px;height:24px;color:var(--primary)}
.nav-menu{flex:1;display:flex;justify-content:center;gap:26px}
.nav-menu a{color:var(--muted);text-decoration:none;font-size:15px;transition:color .2s}
.nav-menu a:hover{color:var(--primary)}
.nav-btn{margin-left:auto;padding:5px 16px;border-radius:999px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-size:14px;text-decoration:none;font-weight:600;flex:none;transition:transform .2s,box-shadow .2s}
.nav-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}

.hero{padding:130px 0 72px;background:linear-gradient(180deg,var(--bg-soft),var(--bg))}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-desc{margin-top:22px;font-size:17px;color:var(--muted);max-width:530px}
.hero-btn{margin-top:34px;padding:15px 44px;font-size:17px}

.chat{width:100%;max-width:400px;margin-left:auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 16px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff}
.chat-head img{width:44px;height:44px;border-radius:50%;border:2px solid #fff;object-fit:cover;flex:none}
.chat-meta{display:flex;flex-direction:column}
.chat-meta b{font-size:16px;line-height:1.3}
.chat-status{font-size:13px;display:flex;align-items:center;gap:5px;opacity:.95}
.chat-status i{width:7px;height:7px;border-radius:50%;background:var(--green);display:inline-block}
.chat-body{height:340px;overflow-y:auto;padding:18px 16px;display:flex;flex-direction:column;gap:12px;background:linear-gradient(180deg,#FFF2F8,#FFFDFE)}
.msg{max-width:78%;padding:11px 14px;border-radius:16px;font-size:14px;line-height:1.6;word-break:break-word;animation:pop .3s ease}
.msg.ai{align-self:flex-start;background:#fff;border:1px solid var(--border);border-bottom-left-radius:4px;color:var(--text)}
.msg.user{align-self:flex-end;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:4px}
@keyframes pop{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;background:#fff;border-top:1px solid var(--border)}
.chat-input input{flex:1;min-width:0;border:1px solid var(--border);border-radius:999px;background:var(--bg);padding:10px 16px;font-size:13px;color:var(--text);outline:none}
.send{width:44px;height:44px;flex:none;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border:0;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .2s,box-shadow .2s}
.send:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.send svg{width:20px;height:20px}
.send.off{background:#DCC8D8;cursor:default}
.send.off:hover{transform:none;box-shadow:none}

.personas{margin-top:76px;text-align:center}
.persona-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:34px}
.persona{padding:24px 14px 18px;display:flex;flex-direction:column;align-items:center;gap:12px}
.persona img{width:96px;height:96px;border-radius:50%;object-fit:cover;border:3px solid var(--primary-soft)}
.persona span{font-size:15px;font-weight:600;color:var(--deep)}

.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.step{position:relative;padding:38px 28px 32px}
.step-num{position:absolute;top:20px;right:26px;font-size:44px;font-weight:800;color:var(--primary);opacity:.18;line-height:1}
.step svg{width:44px;height:44px;color:var(--primary)}
.step h3{font-size:19px;color:var(--deep);margin:18px 0 8px}
.step p{font-size:14.5px;color:var(--muted)}

.intro{background:var(--bg-soft)}
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.intro-text h2{text-align:left}
.intro-text>p{margin-top:18px;color:var(--muted);font-size:15.5px}
.checks{list-style:none;margin-top:26px;display:flex;flex-direction:column;gap:14px}
.checks li{position:relative;padding-left:34px;font-size:16px;color:var(--text);font-weight:500}
.checks li::before{content:"✓";position:absolute;left:0;top:1px;width:22px;height:22px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-size:13px;line-height:22px;text-align:center;font-weight:700}
.phone{max-width:300px;margin:0 auto;background:#fff;border:1px solid var(--border);border-radius:30px;overflow:hidden;box-shadow:0 20px 50px rgba(240,61,116,.14)}
.phone-top{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;font-weight:700;color:var(--deep);border-bottom:1px solid var(--border)}
.phone-top span{color:var(--green);font-size:13px;font-weight:500}
.phone-chat{display:flex;flex-direction:column;gap:10px;padding:18px;background:var(--bg);min-height:280px}
.phone-chat .msg{max-width:82%;padding:10px 13px;border-radius:14px;font-size:14px;line-height:1.55}
.phone-foot{padding:12px;text-align:center;font-size:12px;color:var(--muted);border-top:1px solid var(--border)}

.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:40px}
.feat{padding:32px 24px}
.feat svg{width:44px;height:44px;color:var(--primary)}
.feat h3{font-size:18px;color:var(--deep);margin:16px 0 8px}
.feat p{font-size:14px;color:var(--muted)}

.compare{background:var(--bg-soft)}
.compare-table{width:100%;table-layout:fixed;border-collapse:separate;border-spacing:0;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);margin-top:40px}
.compare-table th{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;padding:16px 20px;font-size:16px;font-weight:700;text-align:center}
.compare-table th:first-child{background:var(--deep);text-align:left;width:26%}
.compare-table td{padding:14px 20px;font-size:14px;text-align:center;border-top:1px solid var(--border)}
.compare-table td:first-child{background:var(--bg);color:var(--deep);font-weight:600;text-align:left}
.slide-hint{display:none;text-align:center;color:var(--muted);font-size:12px;margin-top:14px}

.data{padding:90px 0;background:linear-gradient(135deg,#2A1A3D,#3B2458);text-align:center}
.data h2{color:#fff}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px}
.data-item b{display:block;font-size:46px;font-weight:800;background:linear-gradient(90deg,#FFA9C3,#FF5C8A);-webkit-background-clip:text;background-clip:text;color:transparent}
.data-item span{display:block;margin-top:8px;color:#CBB8DE;font-size:15px}

.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.review{padding:26px 24px}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;flex:none}
.review-head b{display:block;font-size:16px;color:var(--deep)}
.stars{color:var(--star);font-size:14px;letter-spacing:2px;display:block;margin-top:2px}
.review p{font-size:14.5px;color:var(--muted)}

.privacy{background:var(--bg-soft)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:40px}
.pri{padding:30px 24px}
.pri svg{width:42px;height:42px;color:var(--primary)}
.pri h3{font-size:17px;color:var(--deep);margin:14px 0 8px}
.pri p{font-size:14px;color:var(--muted)}

.version-card{display:grid;grid-template-columns:1fr 1.25fr;gap:40px;padding:42px;align-items:start}
.ver-left h2{text-align:left}
.ver-date{color:var(--muted);margin-top:12px;font-size:15px}
.ver-right h3{font-size:18px;color:var(--deep);margin-bottom:16px}
.ver-right ul{list-style:none;display:flex;flex-direction:column;gap:11px}
.ver-right li{position:relative;padding-left:28px;font-size:14.5px;color:var(--text)}
.ver-right li::before{content:"✓";position:absolute;left:0;top:3px;width:18px;height:18px;border-radius:50%;background:var(--primary-soft);color:var(--primary);font-size:11px;font-weight:700;line-height:18px;text-align:center}

.faq{background:var(--bg-soft)}
.faq-wrap{max-width:820px}
.faq-list{display:flex;flex-direction:column;gap:14px;margin-top:36px}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;background:none;border:0;font-size:16px;font-weight:600;color:var(--deep);cursor:pointer;text-align:left;font-family:inherit}
.faq-q svg{width:20px;height:20px;color:var(--primary);flex:none;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-item.open .faq-a{max-height:240px}
.faq-a-inner{padding:0 22px 20px;color:var(--muted);font-size:14.5px}

.download{background:linear-gradient(180deg,var(--bg-soft),var(--bg));text-align:center}
.download h1{font-size:40px}
.dl-meta{color:var(--muted);font-size:13px;margin-top:16px;white-space:nowrap}
.dl-btns{display:flex;justify-content:center;gap:20px;margin-top:34px}
.dl-btn{padding:16px 36px;font-size:16px}
.dl-tip{margin-top:26px;color:var(--muted);font-size:14px}

.footer{background:var(--deep);color:#CBB8DE;padding:34px 0;text-align:center;font-size:14px}
.footer a{color:#fff;text-decoration:none;font-weight:600}

.backtop{position:fixed;right:26px;bottom:30px;z-index:99;width:46px;height:46px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border:0;cursor:pointer;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}
.backtop.show{opacity:1;visibility:visible;transform:translateY(0)}
.backtop svg{width:22px;height:22px}

@media (max-width:1100px){
  h1{font-size:38px}
  h2{font-size:30px}
  .persona-grid,.features-grid,.privacy-grid,.data-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding:110px 0 64px}
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .chat{margin:0 auto}
  .intro-grid{grid-template-columns:1fr;gap:40px}
  .version-card{grid-template-columns:1fr;gap:28px}
}

@media (max-width:768px){
  section{padding:60px 0}
  .wrap,.nav-inner{padding-left:20px;padding-right:20px}
  .logo{min-height:44px}
  .chat-input input{font-size:16px}
  .hero{padding:100px 0 56px}
  .hero-btn{display:block;text-align:center;width:100%}
  .compare-scroll{overflow-x:auto}
  .compare-table{min-width:640px;margin-top:0}
  .slide-hint{display:block}
  .dl-btns{flex-direction:column;gap:14px;max-width:420px;margin-left:auto;margin-right:auto}
  .dl-btn{width:100%;text-align:center;padding:16px 24px}
  .dl-meta{font-size:12px}
  .download h1{font-size:32px}
  .backtop{right:16px;bottom:22px}
  .nav-btn{padding:11px 22px;font-size:15px}
}

@media (max-width:640px){
  h1{font-size:30px}
  h2{font-size:26px}
  .ver{font-size:13px;padding:2px 10px}
  .chat-body{height:280px}
  .persona img{width:80px;height:80px}
  .persona span{font-size:14px}
  .steps-grid{grid-template-columns:1fr}
  .features-grid,.reviews-grid,.privacy-grid{grid-template-columns:1fr}
  .data-item b{font-size:34px}
  .data{padding:70px 0}
}