: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:76px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit}

.container{width:min(1180px,92%);margin-inline:auto}
.section{padding:96px 0}
.section.alt{background:var(--bg-soft)}

/* 通用卡片公式 */
.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)}

/* 通用按钮公式 */
.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:700;
  font-size:16px;
  padding:15px 36px;
  cursor:pointer;
  transition:transform .25s,box-shadow .25s;
  text-align:center;
}
.btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.btn-ghost{background:#fff;color:var(--primary-deep);border:1px solid var(--primary)}

.tag{
  display:inline-block;
  background:var(--primary-soft);
  color:var(--primary-deep);
  font-size:13px;
  font-weight:700;
  padding:6px 16px;
  border-radius:999px;
  margin-bottom:16px;
}
.tag.dark{background:rgba(255,255,255,.12);color:#FFD3E2}
.section-head{text-align:center;margin-bottom:52px}
.section-head h2{font-size:clamp(26px,3.2vw,38px);color:var(--deep);font-weight:800;letter-spacing:.5px}
.section-head .tag.dark + h2{color:#fff}

/* 1 导航 */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:box-shadow .3s;
}
.nav.scrolled{box-shadow:0 4px 20px rgba(42,26,61,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.nav-logo{display:flex;align-items:center;gap:8px;font-size:22px;font-weight:800;color:var(--deep)}
.nav-logo svg{width:26px;height:26px;color:var(--primary)}
.nav-links{display:flex;gap:30px}
.nav-link{font-size:15px;color:var(--text);font-weight:500;position:relative;padding:6px 2px}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  transform:scaleX(0);transition:transform .25s;
}
.nav-link:hover{color:var(--primary-deep)}
.nav-link:hover::after{transform:scaleX(1)}
.btn-nav{padding:7px 20px;font-size:13.5px}

/* 2 Hero */
.hero{position:relative;padding:calc(var(--nav-h) + 56px) 0 80px;overflow:hidden;background:linear-gradient(180deg,#FFF0F6 0%,#FFE9F1 55%,#FFF9FB 100%)}
.hero::before{
  content:"";position:absolute;top:-120px;right:-120px;width:460px;height:460px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,92,138,.18),transparent 65%);
}
.hero::after{
  content:"";position:absolute;bottom:-140px;left:-120px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(240,61,116,.14),transparent 65%);
}
.hero-grid{
  position:relative;z-index:1;
  display:grid;
  grid-template-columns:1.05fr .95fr;
  grid-template-areas:"copy chat" "personas chat" "cta chat";
  gap:30px 46px;
  align-items:center;
}
.hero-copy{grid-area:copy}
.hero h1{font-size:clamp(30px,4.4vw,50px);color:var(--deep);font-weight:800;line-height:1.25}
.version{
  display:inline-block;vertical-align:middle;margin-left:10px;
  font-size:15px;font-weight:700;color:var(--primary-deep);
  background:var(--primary-soft);border:1px solid var(--primary);
  border-radius:999px;padding:4px 12px;
}
.hero-desc{margin-top:18px;font-size:clamp(15px,1.6vw,17px);color:var(--muted);max-width:560px}
.personas{grid-area:personas;display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin-top:4px}
.persona{text-align:center;cursor:default}
.persona img{
  width:100%;aspect-ratio:1;object-fit:cover;border-radius:50%;
  border:3px solid #fff;box-shadow:var(--shadow);
  transition:transform .25s;
}
.persona:hover img{transform:translateY(-4px) scale(1.04)}
.persona figcaption{margin-top:8px;font-size:13px;font-weight:600;color:var(--text)}
.hero .btn-hero{grid-area:cta;justify-self:start;padding:16px 42px;font-size:17px}

/* 聊天窗口 */
.hero-chat{grid-area:chat;display:flex;justify-content:center}
.chat-card{
  width:min(420px,100%);
  background:#fff;
  border:1px solid var(--border);
  border-radius:22px;
  box-shadow:0 18px 50px rgba(240,61,116,.16);
  overflow:hidden;
  display:flex;flex-direction:column;
  height:560px;
}
.chat-head{
  display:flex;align-items:center;gap:12px;
  padding:14px 18px;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
}
.chat-avatar{width:44px;height:44px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.75);flex:none}
.chat-head-info{line-height:1.35}
.chat-name{color:#fff;font-size:16px;font-weight:700}
.chat-status{color:rgba(255,255,255,.92);font-size:12px;display:flex;align-items:center;gap:6px}
.chat-status .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.35)}
.chat-body{
  flex:1;overflow-y:auto;padding:18px 16px;
  background:#FFFDFE;
  display:flex;flex-direction:column;
}
.msg{display:flex;align-items:flex-end;gap:9px;margin-bottom:13px}
.msg .msg-avatar{width:32px;height:32px;border-radius:50%;object-fit:cover;flex:none}
.msg .bubble{max-width:78%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.65;word-break:break-word}
.msg.ai .bubble{background:#fff;border:1px solid var(--border);border-bottom-left-radius:5px;color:var(--text)}
.msg.me{flex-direction:row-reverse}
.msg.me .bubble{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:5px}
.chat-input{
  display:flex;align-items:center;gap:10px;
  padding:12px 14px;
  border-top:1px solid var(--border);
  background:#fff;
}
.chat-placeholder{
  flex:1;height:44px;line-height:44px;padding:0 18px;
  border-radius:999px;background:var(--bg-soft);
  color:var(--muted);font-size:14px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.send-btn{
  width:44px;height:44px;border-radius:50%;flex:none;border:0;cursor:pointer;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  color:#fff;display:grid;place-items:center;
  transition:transform .2s,box-shadow .25s;
}
.send-btn:hover{transform:scale(1.06);box-shadow:var(--shadow-hover)}
.send-btn svg{width:18px;height:18px}
.chat-input.done .send-btn{background:#D9CBD6;cursor:not-allowed;box-shadow:none}
.chat-input.done .chat-placeholder{color:#A394AD}

/* 3 三步上手 */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{text-align:center;padding:34px 26px}
.step-num{
  width:46px;height:46px;border-radius:50%;margin:0 auto 16px;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  color:#fff;font-size:20px;font-weight:800;
  display:grid;place-items:center;
  box-shadow:var(--shadow);
}
.step-card h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.step-card p{font-size:14.5px;color:var(--muted)}

/* 4 产品介绍 */
.product-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.product-copy h2{font-size:clamp(26px,3vw,36px);color:var(--deep);font-weight:800;margin:4px 0 18px}
.product-copy>p{color:var(--muted);font-size:15.5px;margin-bottom:24px}
.check-list{display:flex;flex-direction:column;gap:13px}
.check-list li{display:flex;align-items:center;gap:11px;font-size:15.5px;font-weight:600;color:var(--text)}
.check-list svg{width:22px;height:22px;color:var(--green);flex:none}
.product-media img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}

/* 5 核心功能 */
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.feat-card{padding:28px 24px}
.feat-icon{
  width:48px;height:48px;border-radius:14px;display:grid;place-items:center;
  background:var(--primary-soft);color:var(--primary-deep);margin-bottom:16px;
}
.feat-icon svg{width:24px;height:24px}
.feat-card h3{font-size:18px;color:var(--deep)}
.pain{
  display:inline-block;margin:10px 0 8px;
  font-size:13px;font-weight:600;color:var(--primary-deep);
  background:var(--primary-soft);border-radius:999px;padding:4px 12px;
}
.feat-card p{font-size:14px;color:var(--muted)}

/* 6 优势对比 */
.cmp-wrap{
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
table.cmp{width:100%;min-width:640px;border-collapse:separate;border-spacing:0}
.cmp th,.cmp td{padding:16px 20px;font-size:14.5px;text-align:center;white-space:nowrap}
.cmp thead th{background:var(--deep);color:#fff;font-weight:700}
.cmp thead th:first-child{border-top-left-radius:var(--radius)}
.cmp thead th:last-child{border-top-right-radius:var(--radius)}
.cmp thead .col-brand{background:linear-gradient(90deg,var(--primary),var(--primary-deep))}
.cmp tbody td{border-top:1px solid var(--border)}
.cmp tbody td:first-child{text-align:left;font-weight:700;color:var(--deep)}
.cmp tbody .good{color:var(--primary-deep);font-weight:600}
.cmp tbody tr:last-child td:first-child{border-bottom-left-radius:var(--radius)}
.cmp tbody tr:last-child td:last-child{border-bottom-right-radius:var(--radius)}
.cmp-hint{display:none;text-align:center;color:var(--muted);font-size:13px;margin-top:12px}

/* 7 使用场景 */
.scene-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-bottom:44px}
.scene-list li{
  display:flex;align-items:flex-start;gap:11px;
  background:var(--card);border:1px solid var(--border);border-radius:14px;
  padding:16px 18px;font-size:15px;color:var(--text);
  box-shadow:var(--shadow);
}
.scene-list svg{width:22px;height:22px;color:var(--green);flex:none;margin-top:3px}
.vs-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.vs-card{padding:30px 28px}
.vs-card h3{font-size:19px;margin-bottom:16px}
.vs-card li{position:relative;padding-left:22px;font-size:14.5px;color:var(--text);margin-bottom:10px}
.vs-card li::before{content:"";position:absolute;left:2px;top:9px;width:9px;height:9px;border-radius:50%}
.vs-hard{background:#FFF6F8}
.vs-hard h3{color:var(--muted)}
.vs-hard li{color:var(--muted)}
.vs-hard li::before{background:#E3C7D5}
.vs-soft{background:linear-gradient(180deg,#FFF0F6,#FFE9F1);border-color:var(--primary)}
.vs-soft h3{color:var(--primary-deep)}
.vs-soft li::before{background:var(--primary)}

/* 8 数据 */
.data-section{background:var(--deep);position:relative;overflow:hidden}
.data-section::before{
  content:"";position:absolute;top:-160px;right:-140px;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,92,138,.28),transparent 65%);
}
.data-section::after{
  content:"";position:absolute;bottom:-160px;left:-140px;width:480px;height:480px;border-radius:50%;
  background:radial-gradient(circle,rgba(240,61,116,.2),transparent 65%);
}
.data-grid{position:relative;z-index:1;display:grid;grid-template-columns:repeat(4,1fr);gap:26px;text-align:center}
.data-num{font-size:clamp(34px,4.4vw,52px);font-weight:800;color:#fff;line-height:1.2}
.data-label{margin-top:8px;color:#C9B8DE;font-size:15px}

/* 9 人设定制 */
.persona-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.persona-copy h2{font-size:clamp(26px,3vw,36px);color:var(--deep);font-weight:800;margin:4px 0 18px}
.persona-copy>p{color:var(--muted);font-size:15.5px;margin-bottom:26px}
.persona-media img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}

/* 10 评价 */
.rev-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.rev-card{padding:26px 24px}
.rev-head{display:flex;align-items:center;gap:13px;margin-bottom:14px}
.rev-avatar{
  width:46px;height:46px;border-radius:50%;flex:none;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  color:#fff;font-size:19px;font-weight:700;
  display:grid;place-items:center;
}
.rev-name{font-size:16px;font-weight:700;color:var(--deep)}
.stars{color:#FFB84D;font-size:14px;letter-spacing:2px}
.rev-text{font-size:14.5px;color:var(--text);line-height:1.75}

/* 11 隐私 */
.priv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.priv-card{padding:28px 24px}
.priv-icon{
  width:48px;height:48px;border-radius:50%;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  color:#fff;margin-bottom:16px;
}
.priv-icon svg{width:24px;height:24px}
.priv-card h3{font-size:17px;color:var(--deep);margin-bottom:9px}
.priv-card p{font-size:14px;color:var(--muted)}

/* 12 版本更新 */
.log-card{max-width:780px;margin:0 auto;padding:38px 40px}
.log-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:24px}
.log-version{
  font-size:22px;font-weight:800;color:#fff;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));
  border-radius:12px;padding:8px 18px;
}
.log-date{font-size:14.5px;color:var(--muted)}
.log-list li{
  position:relative;padding:11px 0 11px 96px;
  font-size:15px;color:var(--text);
  border-bottom:1px dashed var(--border);
}
.log-list li:last-child{border-bottom:0}
.log-list b{
  position:absolute;left:0;top:11px;
  font-size:12.5px;font-weight:700;color:var(--primary-deep);
  background:var(--primary-soft);border-radius:999px;padding:3px 12px;
}

/* 13 FAQ */
.faq{max-width:820px;margin:0 auto}
.faq-item{
  background:var(--card);border:1px solid var(--border);border-radius:16px;
  box-shadow:var(--shadow);margin-bottom:14px;overflow:hidden;
  transition:box-shadow .25s;
}
.faq-item.open{box-shadow:var(--shadow-hover)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;
  background:none;border:0;padding:20px 22px;cursor:pointer;
  font-size:16px;font-weight:700;color:var(--deep);text-align:left;
}
.faq-icon{flex:none;color:var(--primary);display:grid;place-items:center;transition:transform .3s}
.faq-icon svg{width:22px;height:22px}
.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 22px 20px;font-size:14.5px;color:var(--muted);line-height:1.85}

/* 14 下载区域 */
.dl-section{background:linear-gradient(180deg,#FFF9FB,#FFF0F6);text-align:center;padding-bottom:100px}
.dl-section h1{font-size:clamp(28px,4vw,44px);color:var(--deep);font-weight:800}
.dl-info{margin-top:14px;font-size:15px;color:var(--muted)}
.dl-btns{display:flex;justify-content:center;gap:18px;margin-top:32px;flex-wrap:wrap}
.dl-tip{margin-top:22px;font-size:15px;color:var(--muted)}

/* 15 页脚 */
.footer{background:var(--deep);color:#C9B8DE;text-align:center;padding:36px 20px;font-size:14px}
.footer a{color:#fff}

/* 16 返回顶部 */
.to-top{
  position:fixed;right:24px;bottom:24px;z-index:99;
  width:48px;height:48px;border-radius:50%;border:0;cursor:pointer;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  color:#fff;display:grid;place-items: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:none}
.to-top svg{width:22px;height:22px}

/* ≤1100px */
@media (max-width:1100px){
  .section{padding:80px 0}
  .personas{grid-template-columns:repeat(3,1fr)}
  .feat-grid,.data-grid,.priv-grid,.rev-grid{grid-template-columns:repeat(2,1fr)}
}

/* ≤900px */
@media (max-width:900px){
  .nav-links{display:none}
  .hero{padding-top:calc(var(--nav-h) + 40px)}
  .hero-grid{grid-template-columns:1fr;grid-template-areas:"copy" "chat" "personas" "cta";gap:30px}
  .hero .btn-hero{justify-self:stretch}
  .hero-desc{max-width:none}
  .product-grid,.persona-grid{grid-template-columns:1fr;gap:36px}
  .product-media img,.persona-media img{max-width:520px;margin-inline:auto}
  .vs-grid{grid-template-columns:1fr}
  .scene-list{grid-template-columns:1fr}
}

/* ≤768px */
@media (max-width:768px){
  .container{width:auto;padding:0 20px}
  .section{padding:64px 0}
  .section-head{margin-bottom:40px}
  .steps-grid{grid-template-columns:1fr;max-width:440px;margin-inline:auto}
  .cmp-hint{display:block}
  .dl-btns{flex-direction:column;align-items:stretch;max-width:420px;margin:28px auto 0}
  .dl-info{font-size:12.5px}
  .hero .btn-hero{width:100%;margin-top:30px}
  .persona-copy .btn{width:100%}
  .log-card{padding:30px 24px}
}

/* ≤640px */
@media (max-width:640px){
  .feat-grid,.rev-grid,.priv-grid{grid-template-columns:1fr}
  .chat-card{height:470px}
  .chat-body{padding:14px 12px}
  .msg .bubble{font-size:14px}
  .to-top{right:16px;bottom:16px}
  .personas{gap:10px}
  .persona figcaption{font-size:12px}
}