/* ===== 基础 ===== */
: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:66px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:78px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.65;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit}
.container{max-width:1180px;margin:0 auto;padding:0 24px}

/* ===== 通用组件 ===== */
.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-radius:999px;border:none;cursor:pointer;font-weight:600;
  transition:transform .25s,box-shadow .25s;box-shadow:0 8px 20px rgba(240,61,116,.28);
}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(240,61,116,.38)}
.btn-lg{height:56px;padding:0 34px;font-size:17px}
.section{padding:88px 0}
.section.alt{background:var(--bg-soft)}
.sec-title{font-size:32px;font-weight:800;color:var(--deep);text-align:center;line-height:1.3}
.sec-title.left{text-align:left}
.sec-title.light{color:#fff}
.sec-sub{text-align:center;color:var(--muted);margin-top:10px;font-size:16px}
.hl{color:var(--primary-deep)}

/* ===== 1 导航 ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(255,249,251,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;transition:box-shadow .3s,border-color .3s;
}
.nav.scrolled{box-shadow:0 6px 24px rgba(42,26,61,.08);border-bottom-color:var(--border)}
.nav-inner{max-width:1180px;margin:0 auto;height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;padding:0 24px}
.logo{display:flex;align-items:center;gap:8px;font-size:20px;font-weight:800;color:var(--deep);height:44px}
.logo:hover{color:var(--primary-deep)}
.nav-menu{display:flex;gap:28px;align-items:center}
.nav-menu a{font-size:15px;font-weight:500;color:var(--text);transition:color .2s}
.nav-menu a:hover{color:var(--primary-deep)}
.nav-download{height:44px;padding:0 18px;font-size:14px}

/* ===== 2 Hero ===== */
.hero{padding:calc(var(--nav-h) + 56px) 0 64px;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-text h1{font-size:44px;font-weight:800;color:var(--deep);line-height:1.25}
.hero-desc{margin:20px 0 32px;font-size:17px;color:var(--text);max-width:520px}
.chat{
  max-width:380px;height:462px;margin-left:auto;display:flex;flex-direction:column;
  background:linear-gradient(165deg,#2A1A3D 0%,#6E2B8B 52%,#F03D74 135%);
  border-radius:24px;border:1px solid rgba(255,255,255,.16);
  box-shadow:0 24px 60px rgba(42,26,61,.35);overflow:hidden;
}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 16px;background:rgba(255,255,255,.09);border-bottom:1px solid rgba(255,255,255,.12)}
.chat-avatar{width:44px;height:44px;border-radius:50%;border:2px solid #fff;object-fit:cover;flex:none}
.chat-name{color:#fff;font-size:15px;font-weight:700;line-height:1.3}
.chat-status{color:#fff;font-size:12px;opacity:.9;display:flex;align-items:center;gap:6px;line-height:1.4}
.dot{width:7px;height:7px;border-radius:50%;background:var(--green);display:inline-block;box-shadow:0 0 0 3px rgba(46,197,126,.25)}
.chat-body{flex:1;overflow-y:auto;padding:18px 14px;display:flex;flex-direction:column;gap:12px}
.chat-body::-webkit-scrollbar{width:4px}
.chat-body::-webkit-scrollbar-thumb{background:rgba(255,255,255,.25);border-radius:4px}
.msg{max-width:80%;padding:10px 14px;font-size:14px;line-height:1.55;border-radius:16px;word-break:break-word}
.msg.ai{align-self:flex-start;background:#fff;color:var(--text);border-bottom-left-radius:4px;box-shadow:0 4px 12px rgba(0,0,0,.14)}
.msg.me{align-self:flex-end;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:4px}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;background:rgba(255,255,255,.1);border-top:1px solid rgba(255,255,255,.12)}
.chat-input input{flex:1;min-width:0;border:none;outline:none;background:#fff;border-radius:999px;padding:12px 16px;font-size:13px;color:var(--text)}
.send{
  width:44px;height:44px;flex:none;border-radius:50%;border:none;cursor:pointer;
  background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 16px rgba(240,61,116,.4);transition:transform .2s,opacity .3s,box-shadow .3s;
}
.send:hover{transform:scale(1.06)}
.send.off{background:#C9B6C9;box-shadow:none;cursor:not-allowed;transform:none}
.personas{margin-top:56px}
.personas-title{text-align:center;font-size:15px;color:var(--muted);margin-bottom:20px}
.persona-list{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.persona{
  display:flex;flex-direction:column;align-items:center;gap:10px;padding:18px 8px 14px;
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s;
}
.persona:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.persona img{width:88px;height:88px;border-radius:50%;object-fit:cover;border:3px solid #fff;box-shadow:0 6px 16px rgba(240,61,116,.22)}
.persona span{font-size:14px;font-weight:600;color:var(--deep)}

/* ===== 3 三步上手 ===== */
.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:44px}
.step{padding:32px 28px;text-align:center}
.step-num{font-size:30px;font-weight:800;color:var(--primary);opacity:.9;letter-spacing:1px}
.step h3{margin:14px 0 8px;font-size:20px;color:var(--deep)}
.step p{color:var(--muted);font-size:15px}

/* ===== 4 产品介绍 ===== */
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.intro-media img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%}
.intro-copy p{margin:18px 0 24px;font-size:16px;color:var(--text)}
.check-list{display:flex;flex-direction:column;gap:14px}
.check-list li,.scene-list li{position:relative;font-size:15.5px;color:var(--text);font-weight:500}
.check-list li::before,.scene-list li::before{
  content:"";position:absolute;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  -webkit-mask:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z"/></svg>') center/contain no-repeat;
  mask:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z"/></svg>') center/contain no-repeat;
}
.check-list li{padding-left:34px}
.check-list li::before{left:0;top:2px;width:22px;height:22px}

/* ===== 5 四大核心功能 ===== */
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:44px}
.feature{padding:30px 26px}
.feature-icon{
  width:52px;height:52px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  background:var(--primary-soft);color:var(--primary-deep);margin-bottom:18px;
}
.feature h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.pain{font-size:13px;color:var(--primary-deep);background:var(--primary-soft);border-radius:10px;padding:8px 12px;margin-bottom:12px;line-height:1.5}
.feat-desc{font-size:14.5px;color:var(--muted)}

/* ===== 6 优势对比 ===== */
.compare-wrap{overflow-x:auto;margin-top:44px;-webkit-overflow-scrolling:touch}
.compare-table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;table-layout:fixed;min-width:640px}
.compare-table th,.compare-table td{padding:14px 16px;font-size:14.5px;text-align:center;border-bottom:1px solid var(--border);border-right:1px solid var(--border)}
.compare-table th:first-child,.compare-table td:first-child{text-align:left;width:20%;background:var(--bg-soft);font-weight:600;color:var(--deep)}
.compare-table th{background:var(--bg-soft);color:var(--deep);font-weight:700}
.compare-table th:nth-child(2),.compare-table td:nth-child(2){width:38%;background:var(--primary-soft);color:var(--primary-deep);font-weight:600}
.compare-table th:nth-child(3){width:21%}
.compare-table th:nth-child(4){width:21%;border-right:none}
.compare-table tr:last-child td{border-bottom:none}
.badge-self{display:inline-block;font-size:11px;font-weight:700;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;padding:2px 8px;margin-right:6px;vertical-align:1px}
.swipe-hint{display:none;text-align:center;color:var(--muted);font-size:13px;margin-top:14px}

/* ===== 7 使用场景 ===== */
.scene-list{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:820px;margin:40px auto 56px}
.scene-list li{position:relative;padding-left:32px;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px 16px 14px 42px;box-shadow:var(--shadow)}
.scene-list li::before{left:14px;top:50%;transform:translateY(-50%);width:20px;height:20px}
.vs-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:center}
.vs-card{padding:30px 28px}
.vs-card h3{font-size:20px;color:var(--deep);margin-bottom:18px}
.vs-card.good{border-color:var(--primary);box-shadow:0 10px 30px rgba(240,61,116,.14)}
.vs-list{display:flex;flex-direction:column;gap:12px}
.vs-list li{position:relative;padding-left:24px;font-size:14.5px;color:var(--text)}
.vs-list li::before{content:"×";position:absolute;left:0;top:0;color:#C96A8A;font-weight:700}
.vs-card.good .vs-list li::before{content:"✓";color:var(--primary-deep);font-weight:700}
.vs-badge{
  width:58px;height:58px;border-radius:50%;flex:none;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;
  font-size:16px;font-weight:800;display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 24px rgba(240,61,116,.35);
}

/* ===== 8 数据模块 ===== */
.stats{background:linear-gradient(180deg,var(--deep),#3B2357);color:#fff}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px;text-align:center}
.stat-num{
  font-size:46px;font-weight:800;line-height:1.2;
  background:linear-gradient(90deg,#FFB3CA,var(--primary));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:#fff;
}
.stat p{margin-top:8px;font-size:15px;color:rgba(255,255,255,.82)}

/* ===== 9 人设定制 ===== */
.custom-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.custom-copy p{margin:18px 0 24px;font-size:16px}
.custom-copy .btn{margin-top:28px}
.custom-media img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%}

/* ===== 10 用户评价 ===== */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:44px}
.review{padding:26px}
.review-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.review-avatar{
  width:48px;height:48px;border-radius:50%;flex:none;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:18px;font-weight:700;
}
.review-name{font-size:15.5px;font-weight:700;color:var(--deep)}
.stars{font-size:13px;color:#FFB400;letter-spacing:2px}
.review p{font-size:14.5px;color:var(--muted)}

/* ===== 11 隐私安全 ===== */
.privacy{padding:28px 24px}
.privacy-icon{
  width:46px;height:46px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:var(--primary-soft);color:var(--primary-deep);margin-bottom:16px;
}
.privacy h3{font-size:17px;color:var(--deep);margin-bottom:8px}
.privacy p{font-size:14px;color:var(--muted)}

/* ===== 12 版本更新 ===== */
.version-card{max-width:720px;margin:44px auto 0;padding:34px 36px}
.version-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.version-no{font-size:30px;font-weight:800;color:var(--deep)}
.version-date{font-size:14px;color:var(--muted);margin-top:4px}
.version-tag{font-size:13px;font-weight:700;color:var(--primary-deep);background:var(--primary-soft);border-radius:999px;padding:6px 14px}
.changelog{display:flex;flex-direction:column;gap:12px}
.changelog li{position:relative;padding-left:22px;font-size:15px;color:var(--text)}
.changelog li::before{content:"";position:absolute;left:2px;top:9px;width:7px;height:7px;border-radius:50%;background:var(--primary)}

/* ===== 13 FAQ ===== */
.faq-list{max-width:820px;margin:44px auto 0;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;overflow:hidden;box-shadow:var(--shadow);transition:box-shadow .3s}
.faq-item.open{border-color:var(--primary);box-shadow:var(--shadow-hover)}
.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);cursor:pointer;
  background:none;border:none;text-align:left;
}
.faq-arrow{display:inline-block;font-size:22px;font-weight:400;color:var(--primary-deep);transition:transform .3s;line-height:1;flex:none}
.faq-item.open .faq-arrow{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:320px}
.faq-a p{padding:0 22px 20px;color:var(--muted);font-size:14.5px}

/* ===== 14 下载区域 ===== */
.dl{background:linear-gradient(180deg,var(--bg-soft),var(--bg));text-align:center}
.dl-meta{margin-top:14px;font-size:14px;color:var(--muted)}
.dl-btns{display:flex;justify-content:center;gap:18px;margin-top:34px;flex-wrap:wrap}
.dl-tip{margin-top:22px;font-size:15px;color:var(--text)}

/* ===== 15 页脚 ===== */
.footer{background:var(--deep);color:rgba(255,255,255,.75);text-align:center;padding:28px 0;font-size:14px}
.footer a{color:#FFB3CA;transition:color .2s}
.footer a:hover{color:#fff}

/* ===== 16 返回顶部 ===== */
.to-top{
  position:fixed;right:26px;bottom:26px;width:48px;height:48px;border-radius:50%;z-index:90;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(240,61,116,.4);
  opacity:0;visibility:hidden;transform:translateY(14px);transition:opacity .3s,transform .3s,visibility .3s;
}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{transform:translateY(-3px)}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .persona-list{grid-template-columns:repeat(3,1fr)}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .hero-text h1{font-size:38px}
  .sec-title{font-size:28px}
}
@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding-top:calc(var(--nav-h) + 40px)}
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .chat{margin:0 auto}
  .hero-text{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .intro-grid,.custom-grid{grid-template-columns:1fr;gap:36px}
  .custom-copy{display:flex;flex-direction:column;align-items:center}
  .custom-copy .sec-title.left,.custom-copy p,.custom-copy .check-list{align-self:stretch}
  .intro-media img,.custom-media img{max-width:520px;margin:0 auto}
  .vs-grid{grid-template-columns:1fr;gap:18px}
  .vs-badge{margin:0 auto}
  .scene-list{grid-template-columns:1fr}
  .step-grid{grid-template-columns:1fr;max-width:520px;margin-left:auto;margin-right:auto}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .section{padding:64px 0}
  .nav-inner{padding:0 20px}
  .compare-wrap{margin-top:36px}
  .swipe-hint{display:block}
  .dl-btns{flex-direction:column;align-items:stretch}
  .dl-btns .btn{width:100%}
  .dl-meta{font-size:12px;white-space:nowrap}
  .hero-text h1{font-size:30px}
  .persona img{width:72px;height:72px}
  .chat{height:430px}
}
@media (max-width:640px){
  .card-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .stat-num{font-size:38px}
  .version-card{padding:26px 22px}
  .hero-text h1{font-size:27px}
}