/* ================= 全局变量 ================= */
:root{
  --primary:#f14f8a;
  --primary-deep:#d62f6f;
  --primary-light:#ffe3ee;
  --accent:#ff8aa8;
  --grad:linear-gradient(135deg,#f14f8a,#ff8aa8);
  --dark:#331f2b;
  --border:#f2d7e3;
  --bg:#fff6fa;
  --card:#ffffff;
  --text:#3b2c33;
  --sub:#8b7280;
  --shadow:0 10px 30px rgba(241,79,138,.12);
  --radius:16px;
  --nav-h:72px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px)}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:90px 0}
.section-alt{background:#fff}

/* ================= 通用标题 ================= */
.sec-head{text-align:center;max-width:720px;margin:0 auto 52px}
.sec-tag{
  display:inline-block;padding:6px 18px;border-radius:30px;
  background:var(--primary-light);color:var(--primary-deep);
  font-size:14px;font-weight:600;letter-spacing:1px;margin-bottom:16px;
}
.sec-head h2{font-size:34px;line-height:1.3;font-weight:800;color:var(--dark)}
.sec-sub{margin-top:14px;color:var(--sub);font-size:16px}

/* ================= 按钮 ================= */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:14px 34px;border-radius:50px;font-size:16px;font-weight:700;
  transition:transform .25s ease,box-shadow .25s ease,background .25s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 22px rgba(241,79,138,.35)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(241,79,138,.45)}
.btn-light{background:#fff;color:var(--primary-deep);border:2px solid var(--border);box-shadow:0 6px 18px rgba(241,79,138,.12)}
.btn-light:hover{transform:translateY(-3px);box-shadow:0 12px 26px rgba(241,79,138,.22)}
.btn-lg{padding:17px 42px;font-size:18px}

/* ================= 顶部导航 ================= */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);
  background:rgba(255,255,255,.88);backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(242,215,227,.7);
}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:800;color:var(--dark)}
.nav-logo img{width:40px;height:40px;border-radius:12px;object-fit:cover}
.nav-menu{display:flex;align-items:center;gap:6px}
.nav-menu a{
  padding:8px 14px;border-radius:30px;font-size:15px;font-weight:500;color:var(--text);
  transition:color .2s ease,background .2s ease;
}
.nav-menu a:hover{color:var(--primary-deep);background:var(--primary-light)}
.nav-menu a.active{color:var(--primary-deep);background:var(--primary-light);font-weight:700}
.nav-btn{
  padding:10px 26px;border-radius:50px;font-size:15px;font-weight:700;color:#fff;
  background:var(--grad);box-shadow:0 6px 16px rgba(241,79,138,.32);
  transition:transform .25s ease,box-shadow .25s ease;
}
.nav-btn:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(241,79,138,.42)}

/* ================= Hero ================= */
.hero{position:relative;padding:calc(var(--nav-h) + 60px) 0 80px;overflow:hidden}
.hero-bg{
  position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(circle at 15% 20%,rgba(255,138,168,.18),transparent 45%),
    radial-gradient(circle at 85% 30%,rgba(214,47,111,.12),transparent 45%),
    linear-gradient(180deg,#fff 0%,var(--bg) 100%);
}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-tag{
  display:inline-block;padding:7px 18px;border-radius:30px;margin-bottom:22px;
  background:var(--primary-light);color:var(--primary-deep);font-size:14px;font-weight:600;
}
.hero h1{font-size:46px;line-height:1.25;font-weight:900;color:var(--dark);letter-spacing:1px}
.hero-desc{margin:22px 0 26px;font-size:17px;color:var(--sub);max-width:520px}
.hero-personas{display:flex;align-items:center;gap:16px;margin-bottom:30px;flex-wrap:wrap}
.hp-label{font-size:15px;font-weight:600;color:var(--dark)}
.hp-list{display:flex;align-items:center;gap:10px}
.hp-list img{width:46px;height:46px;border-radius:50%;object-fit:cover;border:2px solid #fff;box-shadow:0 4px 12px rgba(241,79,138,.25);transition:transform .25s ease}
.hp-list img:hover{transform:translateY(-4px) scale(1.08)}
.hp-more{
  width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:var(--grad);color:#fff;font-size:16px;font-weight:800;
  box-shadow:0 4px 12px rgba(241,79,138,.3);
}
.hero-note{margin-top:16px;font-size:14px;color:var(--sub)}

/* ================= 聊天窗口 ================= */
.chat-box{
  max-width:420px;margin:0 auto;border-radius:24px;overflow:hidden;
  background:#fff;border:1px solid var(--border);
  box-shadow:0 24px 60px rgba(214,47,111,.18);
}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:var(--grad)}
.chat-head img{width:42px;height:42px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.7)}
.chat-head-info{flex:1}
.chat-name{color:#fff;font-size:15px;font-weight:700;line-height:1.3}
.chat-status{color:rgba(255,255,255,.85);font-size:12px}
.chat-live{width:10px;height:10px;border-radius:50%;background:#7dffb0;box-shadow:0 0 0 4px rgba(125,255,176,.25);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 3px rgba(125,255,176,.3)}50%{box-shadow:0 0 0 7px rgba(125,255,176,.08)}}
.chat-body{padding:18px 14px;min-height:360px;max-height:400px;overflow-y:auto;background:linear-gradient(180deg,#fff7fb,#fff)}
.chat-body::-webkit-scrollbar{width:4px}
.chat-body::-webkit-scrollbar-thumb{background:var(--primary-light);border-radius:4px}
.msg{display:flex;align-items:flex-end;gap:8px;margin-bottom:14px;animation:msgIn .35s ease}
@keyframes msgIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.msg-me{flex-direction:row-reverse}
.m-avatar{width:32px;height:32px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff}
.ai-avatar{background:var(--grad)}
.me-avatar{background:#b9a6b0}
.m-bubble{
  max-width:75%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.6;
  box-shadow:0 2px 6px rgba(214,47,111,.06);
}
.msg-ai .m-bubble{background:#fff;border:1px solid var(--border);border-bottom-left-radius:4px;color:var(--text)}
.msg-me .m-bubble{background:var(--grad);color:#fff;border-bottom-right-radius:4px}
.typing .m-bubble{display:flex;gap:5px;padding:14px 16px;background:#fff;border:1px solid var(--border)}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:tp 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes tp{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}
.chat-foot{display:flex;gap:10px;padding:12px 14px;border-top:1px solid var(--border);background:#fff}
.chat-foot input{
  flex:1;padding:10px 16px;border-radius:30px;border:1px solid var(--border);
  background:var(--bg);font-size:14px;outline:none;color:var(--text);min-width:0;
}
.chat-foot input:focus{border-color:var(--accent)}
.chat-send{padding:0 20px;border-radius:30px;background:var(--grad);color:#fff;font-size:14px;font-weight:700}

/* ================= 三步上手 ================= */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.step-card{
  position:relative;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:40px 28px 32px;text-align:center;transition:transform .3s ease,box-shadow .3s ease;
}
.step-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.step-num{
  position:absolute;top:18px;right:22px;font-size:40px;font-weight:900;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;opacity:.5;
}
.step-icon{font-size:44px;margin-bottom:18px}
.step-card h3{font-size:20px;font-weight:800;color:var(--dark);margin-bottom:10px}
.step-card p{font-size:15px;color:var(--sub)}

/* ================= 产品介绍 ================= */
.about-inner{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-text h2{font-size:34px;font-weight:800;color:var(--dark);line-height:1.35;margin-bottom:20px}
.about-text p{font-size:16px;color:var(--sub);margin-bottom:16px}
.about-list{margin:22px 0 30px}
.about-list li{display:flex;align-items:center;gap:10px;font-size:15px;color:var(--text);margin-bottom:12px}
.about-list span{
  width:22px;height:22px;border-radius:50%;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;flex-shrink:0;
}
.about-visual img{border-radius:24px;box-shadow:var(--shadow);width:100%;height:auto}

/* ================= 核心功能 ================= */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.feature-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  transition:transform .3s ease,box-shadow .3s ease;
}
.feature-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.feature-img img{width:100%;height:230px;object-fit:cover}
.feature-body{padding:24px}
.feature-body h3{font-size:20px;font-weight:800;color:var(--dark);margin-bottom:10px}
.feature-body>p{font-size:15px;color:var(--sub)}
.pain{
  margin-top:14px;padding:12px 14px;border-radius:12px;background:var(--primary-light);
  font-size:14px;color:var(--text);line-height:1.6;
}
.pain b{color:var(--primary-deep)}

/* ================= 优势对比 ================= */
.compare-wrap{display:grid;grid-template-columns:1fr auto 1fr;gap:30px;align-items:stretch;max-width:900px;margin:0 auto}
.compare-col{border-radius:var(--radius);padding:34px 30px;transition:transform .3s ease,box-shadow .3s ease}
.compare-col:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.compare-other{background:#fff;border:1px solid var(--border)}
.compare-other h3{font-size:20px;font-weight:800;color:var(--sub);margin-bottom:20px;text-align:center}
.compare-other li{position:relative;padding-left:24px;font-size:15px;color:var(--sub);margin-bottom:14px}
.compare-other li::before{content:"✕";position:absolute;left:0;color:#d9a8b8;font-weight:700}
.compare-ai{background:var(--grad);border:1px solid var(--primary-deep)}
.compare-ai h3{font-size:20px;font-weight:800;color:#fff;margin-bottom:20px;text-align:center}
.compare-ai li{position:relative;padding-left:24px;font-size:15px;color:#fff;margin-bottom:14px}
.compare-ai li::before{content:"✓";position:absolute;left:0;font-weight:800}
.compare-vs{display:flex;align-items:center;justify-content:center}
.compare-vs span{
  width:56px;height:56px;border-radius:50%;background:var(--dark);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:800;
  box-shadow:0 8px 20px rgba(51,31,43,.2);
}

/* ================= 使用场景 ================= */
.scenes-inner{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.scenes-text h2{font-size:34px;font-weight:800;color:var(--dark);line-height:1.35;margin-bottom:26px}
.scenes-list li{display:flex;align-items:flex-start;gap:10px;font-size:16px;color:var(--text);margin-bottom:14px}
.scenes-list span{color:var(--primary-deep);font-weight:800;flex-shrink:0}
.scenes-visual img{border-radius:24px;box-shadow:var(--shadow);width:100%;height:auto}
.scene-compare{
  margin-top:18px;background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:18px 20px;display:flex;align-items:center;gap:14px;
}
.sc-item{flex:1}
.sc-item b{display:block;font-size:15px;font-weight:800;color:var(--dark);margin-bottom:4px}
.sc-item span{font-size:13px;color:var(--sub)}
.sc-bad b{color:#c07f92}
.sc-good b{color:var(--primary-deep)}
.sc-arrow{font-size:22px;font-weight:800;color:var(--accent);flex-shrink:0}

/* ================= 数据 ================= */
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.data-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:40px 20px;text-align:center;transition:transform .3s ease,box-shadow .3s ease;
}
.data-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.data-num{
  font-size:44px;font-weight:900;background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.data-unit{font-size:20px;font-weight:800;color:var(--primary-deep)}
.data-card p{margin-top:10px;font-size:15px;color:var(--sub)}

/* ================= 人设定制 ================= */
.persona-banner img{width:100%;height:auto;border-radius:24px;box-shadow:var(--shadow);margin-bottom:36px}
.persona-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.persona-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;text-align:center;padding-bottom:24px;
  transition:transform .3s ease,box-shadow .3s ease;
}
.persona-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.persona-card img{width:100%;height:250px;object-fit:cover}
.persona-card h3{font-size:19px;font-weight:800;color:var(--dark);margin:18px 0 8px}
.persona-card p{font-size:14px;color:var(--sub);padding:0 18px}
.persona-custom{
  display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:250px;
  background:linear-gradient(160deg,var(--primary-light),#fff);padding:30px 22px;
}
.pc-icon{font-size:56px;margin-bottom:14px}
.persona-custom h3{margin-top:0}

/* ================= 用户评价 ================= */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.review-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:26px;transition:transform .3s ease,box-shadow .3s ease;
}
.review-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.rv-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.rv-avatar{
  width:46px;height:46px;border-radius:50%;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:800;flex-shrink:0;
}
.rv-name{font-size:15px;font-weight:700;color:var(--dark);line-height:1.4}
.rv-stars{font-size:13px;color:#ffb84d;letter-spacing:2px}
.rv-text{font-size:14px;color:var(--sub);line-height:1.8}

/* ================= 隐私安全 ================= */
.privacy-inner{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px;align-items:center}
.privacy-visual img{width:220px;height:220px;border-radius:40px;margin:0 auto;box-shadow:var(--shadow)}
.privacy-text h2{font-size:32px;font-weight:800;color:var(--dark);line-height:1.35;margin-bottom:18px}
.privacy-text p{font-size:16px;color:var(--sub);margin-bottom:20px}
.privacy-list li{display:flex;align-items:center;gap:12px;font-size:15px;color:var(--text);margin-bottom:12px}
.privacy-list span{font-size:20px}

/* ================= 版本更新 ================= */
.update-card{
  max-width:780px;margin:0 auto;background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:36px 40px;transition:transform .3s ease,box-shadow .3s ease;
}
.update-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.update-top{display:flex;align-items:center;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.update-ver{
  padding:8px 22px;border-radius:30px;background:var(--grad);color:#fff;
  font-size:18px;font-weight:800;
}
.update-date{font-size:14px;color:var(--sub);font-weight:600}
.update-list li{position:relative;padding-left:26px;font-size:15px;color:var(--text);margin-bottom:13px;line-height:1.7}
.update-list li::before{content:"·";position:absolute;left:8px;font-size:22px;color:var(--primary);line-height:1.3}
.update-list li span{
  display:inline-block;padding:2px 10px;border-radius:20px;background:var(--primary-light);
  color:var(--primary-deep);font-size:12px;font-weight:700;margin-right:8px;
}

/* ================= FAQ ================= */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:16px;overflow:hidden;transition:box-shadow .3s ease}
.faq-item:hover{box-shadow:var(--shadow)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 24px;font-size:16px;font-weight:700;color:var(--dark);text-align:left;
}
.faq-icon{
  width:30px;height:30px;border-radius:50%;background:var(--primary-light);color:var(--primary-deep);
  display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;flex-shrink:0;
  transition:transform .3s ease,background .3s ease,color .3s ease;
}
.faq-item.open .faq-icon{transform:rotate(45deg);background:var(--grad);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 24px 22px;font-size:15px;color:var(--sub);line-height:1.8}

/* ================= 下载区域 ================= */
.download{background:var(--grad);text-align:center}
.download h1{font-size:42px;font-weight:900;color:#fff;letter-spacing:1px}
.download-meta{margin:16px 0 34px;color:rgba(255,255,255,.9);font-size:15px}
.download-btns{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}
.download-btns .btn-primary{background:#fff;color:var(--primary-deep);box-shadow:0 10px 26px rgba(0,0,0,.16)}
.download-btns .btn-primary:hover{box-shadow:0 16px 34px rgba(0,0,0,.24)}
.download-btns .btn-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.7);box-shadow:none}
.download-btns .btn-light:hover{background:rgba(255,255,255,.14);box-shadow:0 10px 24px rgba(0,0,0,.14)}
.download-tip{margin-top:26px;font-size:15px;color:rgba(255,255,255,.95)}

/* ================= 页脚 ================= */
.footer{background:var(--dark);padding:52px 0 40px;text-align:center}
.footer-logo{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:14px}
.footer-logo img{width:38px;height:38px;border-radius:11px;object-fit:cover}
.footer-logo span{font-size:20px;font-weight:800;color:#fff}
.footer-slogan{font-size:14px;color:#c9b6c0;margin-bottom:18px}
.footer-copy{font-size:13px;color:#9d8492}
.footer-copy a{color:#e8a7c0;text-decoration:none}
.footer-copy a:hover{color:#fff}

/* ================= 返回顶部 ================= */
.back-top{
  position:fixed;right:26px;bottom:34px;z-index:99;
  width:48px;height:48px;border-radius:50%;background:var(--grad);color:#fff;
  font-size:22px;font-weight:800;display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 24px rgba(241,79,138,.4);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .3s ease,visibility .3s ease,transform .3s ease;
}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{transform:translateY(-4px)}

/* ================= 滚动入场 ================= */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:translateY(0)}

/* ================= 平板适配 ================= */
@media (max-width:1024px){
  .hero h1{font-size:38px}
  .hero-inner{gap:40px}
  .feature-grid,.review-grid,.persona-grid{grid-template-columns:repeat(2,1fr)}
  .data-grid{grid-template-columns:repeat(2,1fr)}
  .nav-menu a{padding:8px 10px;font-size:14px}
}

/* ================= 手机适配 ================= */
@media (max-width:768px){
  .container{padding:0 20px}
  .section{padding:56px 0}
  .nav-inner{padding:0 20px}
  .nav-menu{display:none}
  .nav-logo img{width:34px;height:34px}
  .nav-logo span{font-size:19px}
  .nav-btn{padding:9px 20px;font-size:14px}
  .hero{padding:calc(var(--nav-h) + 36px) 0 52px}
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-left{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .hero-personas{justify-content:center}
  .hero h1{font-size:30px}
  .hero-desc{font-size:15px}
  .chat-box{max-width:100%}
  .btn-lg{width:100%;padding:16px 20px;font-size:16px}
  .steps-grid,.about-inner,.scenes-inner,.privacy-inner{grid-template-columns:1fr;gap:34px}
  .about-text h2,.scenes-text h2{font-size:26px}
  .compare-wrap{grid-template-columns:1fr;gap:18px}
  .compare-vs{transform:rotate(90deg)}
  .data-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .data-card{padding:26px 14px}
  .data-num{font-size:34px}
  .feature-grid,.review-grid,.persona-grid{grid-template-columns:1fr;gap:20px}
  .feature-img img{height:210px}
  .persona-card img{height:auto}
  .privacy-visual img{width:160px;height:160px}
  .update-card{padding:26px 22px}
  .download h1{font-size:30px}
  .download-meta{font-size:12px;margin:14px 0 26px}
  .download-btns{flex-direction:column;gap:14px}
  .download-btns .btn{width:100%}
  .back-top{right:16px;bottom:22px;width:44px;height:44px}
  .section-title{font-size:26px}
}