: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:64px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 14px)}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit}
a:focus-visible,button:focus-visible{outline:2px solid var(--primary-deep);outline-offset:2px}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none;transition:none}
}

.container{width:min(1160px,100%);margin:0 auto;padding-inline:24px}
section{padding:88px 0}

.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-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;
  border:0;
  border-radius:999px;
  font-weight:600;
  cursor:pointer;
  text-align:center;
  transition:transform .25s,box-shadow .25s;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(240,61,116,.32)}
.btn-lg{padding:15px 38px;font-size:16px}
.btn-sm{padding:8px 18px;font-size:13px}

.sec-head{text-align:center;max-width:660px;margin:0 auto 46px}
.sec-head.left{text-align:left;margin:0}
.sec-head h2{font-size:clamp(24px,3vw,34px);color:var(--deep);line-height:1.35}
.sec-head p{color:var(--muted);margin-top:12px;font-size:15.5px}

.ver-badge{
  display:inline-block;
  vertical-align:middle;
  margin-left:10px;
  padding:4px 14px;
  background:var(--primary-soft);
  color:var(--primary-deep);
  border-radius:999px;
  font-size:14px;
  font-weight:700;
}

/* ===== 1 导航 ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);
  background:rgba(255,249,251,.86);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid transparent;
  transition:border-color .3s,box-shadow .3s;
}
.nav.scrolled{border-color:var(--border);box-shadow:0 6px 20px rgba(42,26,61,.06)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:var(--nav-h)}
.logo{display:flex;align-items:center;gap:8px;font-size:22px;font-weight:800;color:var(--deep);white-space:nowrap}
.logo span{line-height:1}
.nav-menu{display:flex;align-items:center;gap:30px}
.nav-menu a{font-size:15px;font-weight:500;color:var(--text);padding:6px 2px;transition:color .2s}
.nav-menu a:hover{color:var(--primary)}
.nav-btn{height:34px;flex-shrink:0}

/* ===== 2 首屏 ===== */
.hero{
  background:linear-gradient(180deg,var(--bg-soft),var(--bg));
  padding:calc(var(--nav-h) + 56px) 0 88px;
  overflow:hidden;
}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(28px,3.8vw,44px);color:var(--deep);line-height:1.3}
.hero-desc{color:var(--muted);margin-top:18px;font-size:16.5px;max-width:540px}

.personas{margin-top:34px}
.personas-title{font-size:18px;color:var(--deep);margin-bottom:16px}
.persona-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.persona{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:16px;
  box-shadow:var(--shadow);
  padding:12px 8px 10px;
  text-align:center;
  transition:transform .25s,box-shadow .25s;
}
.persona:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.persona img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:50%;border:2px solid var(--card)}
.persona span{display:block;margin-top:9px;font-size:13px;font-weight:600;color:var(--text)}
.hero-btn{margin-top:32px}

.chat{
  background:linear-gradient(160deg,#3A2357,var(--deep));
  border-radius:22px;
  box-shadow:0 24px 60px rgba(42,26,61,.35);
  overflow:hidden;
  max-width:400px;
  width:100%;
  margin-inline:auto;
}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:rgba(255,255,255,.06);border-bottom:1px solid rgba(255,255,255,.08)}
.chat-avatar{width:42px;height:42px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.35)}
.chat-user{display:flex;flex-direction:column;line-height:1.35}
.chat-name{color:#fff;font-weight:700;font-size:15px}
.chat-status{display:flex;align-items:center;gap:6px;color:rgba(255,255,255,.72);font-size:12px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--green);display:inline-block}
.chat-body{height:340px;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:12px;scrollbar-width:thin}
.msg{display:flex;max-width:84%}
.msg.ai{align-self:flex-start}
.msg.user{align-self:flex-end}
.bubble{padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.6;animation:msgIn .3s ease}
.msg.ai .bubble{background:#fff;color:var(--text);border-bottom-left-radius:4px}
.msg.user .bubble{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:4px}
@keyframes msgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.chat-input{display:flex;gap:10px;padding:14px 18px;background:rgba(255,255,255,.06);border-top:1px solid rgba(255,255,255,.08)}
.chat-input input{
  flex:1;
  height:44px;
  border:0;
  border-radius:999px;
  background:rgba(255,255,255,.14);
  color:#fff;
  padding:0 16px;
  font-size:13px;
  outline:none;
  min-width:0;
}
.send-btn{
  width:64px;height:44px;flex-shrink:0;
  border:0;border-radius:999px;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;font-size:13px;font-weight:600;
  display:flex;align-items:center;justify-content:center;gap:4px;
  cursor:pointer;
  transition:transform .2s,box-shadow .2s,background .2s;
}
.send-btn:hover{transform:translateY(-1px);box-shadow:0 8px 18px rgba(240,61,116,.4)}
.send-btn.disabled{background:rgba(255,255,255,.16);color:rgba(255,255,255,.5);cursor:not-allowed;box-shadow:none;transform:none}

/* ===== 3 三步上手 ===== */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{padding:34px 28px;text-align:center}
.step-icon{
  width:56px;height:56px;border-radius:16px;
  background:var(--primary-soft);color:var(--primary-deep);
  display:flex;align-items:center;justify-content:center;
  margin:0 auto 18px;
}
.step h3{font-size:19px;color:var(--deep)}
.step p{color:var(--muted);margin-top:10px;font-size:14.5px}

/* ===== 4 产品介绍 ===== */
.intro{background:var(--bg-soft)}
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.intro-grid .sec-head.left{margin-bottom:26px}
.intro-img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;height:auto}
.check-list{display:grid;gap:14px}
.check-list li{display:flex;align-items:flex-start;gap:10px;font-size:15px;font-weight:500;color:var(--text)}
.ck{
  width:22px;height:22px;border-radius:50%;flex-shrink:0;
  background:var(--green);color:#fff;
  display:flex;align-items:center;justify-content:center;
  margin-top:3px;
}

/* ===== 5 四大核心功能 ===== */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature{padding:30px 26px}
.feature-icon{
  width:54px;height:54px;border-radius:16px;
  background:linear-gradient(135deg,var(--primary-soft),#F7E4FF);
  color:var(--primary-deep);
  display:flex;align-items:center;justify-content:center;
  margin-bottom:18px;
}
.pain{
  font-size:12.5px;color:var(--muted);
  background:var(--bg-soft);
  border:1px solid var(--border);
  border-radius:999px;
  padding:4px 12px;
  display:inline-block;
  margin-bottom:14px;
}
.feature h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.feature .desc{color:var(--muted);font-size:14.5px}

/* ===== 6 优势对比 ===== */
.compare{background:var(--bg-soft)}
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  background:var(--card);
}
.cmp{width:100%;border-collapse:collapse}
.cmp th,.cmp td{padding:16px 18px;border-bottom:1px solid var(--border);text-align:center;font-size:14.5px}
.cmp thead th{background:var(--bg-soft);font-weight:700;color:var(--deep);font-size:15px}
.cmp tbody tr:last-child th,.cmp tbody tr:last-child td{border-bottom:0}
.cmp th:first-child,.cmp td:first-child{text-align:left;font-weight:600;color:var(--deep);white-space:nowrap}
.cmp .hl{background:var(--primary-soft);color:var(--primary-deep);font-weight:700}
.table-hint{display:none;color:var(--muted);font-size:12.5px;text-align:center;margin-top:12px}

/* ===== 7 使用场景 ===== */
.scene-list{max-width:640px;margin:0 auto;display:grid;gap:4px}
.scene-list li{display:flex;align-items:flex-start;gap:10px;padding:9px 0;font-size:15.5px;color:var(--text)}
.vs{display:grid;grid-template-columns:1fr auto 1fr;gap:26px;align-items:stretch;margin-top:52px}
.vs-card{padding:32px 28px}
.vs-card h3{font-size:19px;margin-bottom:16px}
.vs-card.bad h3{color:var(--muted)}
.vs-card.bad ul li{color:var(--muted)}
.vs-card.good{border-color:rgba(255,92,138,.45);background:linear-gradient(180deg,#FFF4F8,var(--card))}
.vs-card.good h3{color:var(--primary-deep)}
.vs-card ul{display:grid;gap:10px}
.vs-card li{display:flex;align-items:flex-start;gap:8px;font-size:14.5px}
.vs-card.good li{color:var(--text);font-weight:500}
.vs-card.bad li::before,.vs-card.good li::before{content:"";width:7px;height:7px;border-radius:50%;margin-top:8px;flex-shrink:0}
.vs-card.bad li::before{background:#C9BFD3}
.vs-card.good li::before{background:var(--primary)}
.vs-badge{
  width:58px;height:58px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  color:#fff;font-weight:800;font-size:15px;letter-spacing:.5px;
  display:flex;align-items:center;justify-content:center;
  align-self:center;box-shadow:0 10px 24px rgba(240,61,116,.35);
}

/* ===== 8 数据 ===== */
.stats{background:var(--deep);color:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center}
.stat .num{
  display:block;
  font-size:46px;font-weight:800;line-height:1.2;
  color:#fff;
}
@supports (-webkit-background-clip:text){
  .stat .num{
    background:linear-gradient(90deg,var(--primary),#FFAFC6);
    -webkit-background-clip:text;background-clip:text;
    color:transparent;
  }
}
.stat .label{display:block;margin-top:8px;color:rgba(255,255,255,.72);font-size:15px}

/* ===== 9 人设定制 ===== */
.custom{background:var(--bg-soft)}
.custom-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.custom-grid .sec-head.left{margin-bottom:30px}
.custom-img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;height:auto}

/* ===== 10 用户评价 ===== */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review{padding:26px 24px}
.review-head{display:flex;align-items:center;gap:12px}
.review-ava{
  width:46px;height:46px;border-radius:50%;flex-shrink:0;
  background:linear-gradient(135deg,var(--primary),#B07CE8);
  color:#fff;font-size:19px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.review-name{font-weight:700;color:var(--deep);font-size:15px;line-height:1.4}
.stars{color:#FFB93C;font-size:13px;letter-spacing:2px;line-height:1.4}
.review p{margin-top:14px;font-size:14.5px;color:var(--text)}

/* ===== 11 隐私安全 ===== */
.privacy{background:var(--bg-soft)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.p-card{padding:30px 26px}
.p-icon{
  width:50px;height:50px;border-radius:15px;
  background:var(--primary-soft);color:var(--primary-deep);
  display:flex;align-items:center;justify-content:center;
  margin-bottom:16px;
}
.p-card h3{font-size:17px;color:var(--deep);margin-bottom:10px}
.p-card p{color:var(--muted);font-size:14px}

/* ===== 12 版本更新 ===== */
.version-box{max-width:760px;margin:0 auto;padding:36px 38px}
.version-head{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;padding-bottom:18px;border-bottom:1px solid var(--border)}
.version-head h3{font-size:21px;color:var(--deep)}
.version-date{color:var(--muted);font-size:13.5px}
.version-list{margin-top:20px;display:grid;gap:12px}
.version-list li{display:flex;gap:10px;font-size:14.5px;color:var(--text)}
.version-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary);margin-top:9px;flex-shrink:0}

/* ===== 13 FAQ ===== */
.faq{background:var(--bg-soft)}
.faq-box{max-width:760px;margin:0 auto}
.faq-item{margin-bottom:14px;overflow:hidden}
.faq-q{
  width:100%;
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  background:none;border:0;
  padding:20px 24px;
  font-size:16px;font-weight:600;color:var(--deep);
  cursor:pointer;text-align:left;
}
.faq-icon{
  width:30px;height:30px;border-radius:50%;flex-shrink:0;
  background:var(--primary-soft);color:var(--primary-deep);
  font-size:19px;font-weight:700;line-height:30px;text-align:center;
  transition:transform .3s;
}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a-inner{padding:0 24px 20px;color:var(--muted);font-size:14.5px}

/* ===== 14 下载 ===== */
.download{background:linear-gradient(180deg,var(--bg),var(--bg-soft));text-align:center}
.download h1{color:var(--deep);font-size:clamp(24px,3.4vw,38px);line-height:1.35}
.dl-meta{color:var(--muted);font-size:14px;margin-top:12px}
.dl-btns{display:flex;justify-content:center;gap:18px;margin-top:30px;flex-wrap:wrap}
.dl-btns .btn{min-width:260px}
.dl-tip{margin-top:24px;color:var(--muted);font-size:14px}

/* ===== 15 页脚 ===== */
.footer{background:var(--deep);color:rgba(255,255,255,.68);padding:36px 0;text-align:center}
.footer a{color:#fff;font-weight:700;font-size:16px;text-decoration:none}
.footer p{margin-top:8px;font-size:13px}

/* ===== 16 返回顶部 ===== */
.back-top{
  position:fixed;right:24px;bottom:28px;z-index:90;
  width:46px;height:46px;border-radius:50%;border:0;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 20px rgba(240,61,116,.35);
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .3s,transform .3s,visibility .3s;
}
.back-top.show{opacity:1;visibility:visible;transform:none}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .persona-grid{grid-template-columns:repeat(3,1fr)}
  .feature-grid,.privacy-grid,.stats-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .hero-grid{gap:40px}
}
@media (max-width:900px){
  .nav-menu{display:none}
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero{padding:calc(var(--nav-h) + 40px) 0 64px}
  .hero-text{max-width:620px}
  .intro-grid,.custom-grid{grid-template-columns:1fr;gap:36px}
  .custom-grid>div{text-align:center}
  .steps-grid{grid-template-columns:1fr;max-width:480px;margin:0 auto}
  .vs{grid-template-columns:1fr;gap:18px}
  .vs-badge{justify-self:center;margin:2px 0}
  section{padding:72px 0}
}
@media (max-width:768px){
  .container{padding-inline:20px}
  .cmp{min-width:640px}
  .table-hint{display:block}
  .dl-btns{flex-direction:column;align-items:stretch}
  .dl-btns .btn{min-width:0}
  .dl-meta{font-size:12px;white-space:nowrap}
  .hero-btn{width:100%}
  .version-box{padding:28px 22px}
  .sec-head{margin-bottom:34px}
}
@media (max-width:640px){
  section{padding:60px 0}
  .feature-grid,.review-grid,.privacy-grid{grid-template-columns:1fr}
  .chat-body{height:290px}
  .stat .num{font-size:34px}
  .hero h1{font-size:26px}
  .ver-badge{margin-left:8px;padding:3px 10px;font-size:12px}
  .hero-btn{padding:15px 20px;font-size:15px}
  .cmp th,.cmp td{padding:14px 14px}
  .back-top{right:16px;bottom:20px;width:42px;height:42px}
}