: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:76px}
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;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
.container{max-width:1120px;margin:0 auto;padding:0 24px}
section{padding:84px 0}
.sec-title{font-size:34px;font-weight:800;color:var(--deep);text-align:center;margin-bottom:48px;line-height:1.35}

.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)}
.grad-text{background:linear-gradient(90deg,var(--primary),var(--primary-deep));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* 导航 */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1120px)/2));background:rgba(255,255,255,.9);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:box-shadow .25s,border-color .25s}
.nav.scrolled{box-shadow:0 6px 20px rgba(42,26,61,.08);border-bottom-color:var(--border)}
.logo{font-size:26px;font-weight:800;line-height:1;padding:10px 0}
.menu{display:flex;gap:30px}
.menu a{font-size:15px;font-weight:500;color:var(--text);transition:color .2s}
.menu a:hover{color:var(--primary)}
.nav-download{font-size:14px;font-weight:600;color:#fff;background:linear-gradient(90deg,var(--primary),var(--primary-deep));padding:8px 18px;border-radius:999px;box-shadow:0 6px 16px rgba(240,61,116,.24);transition:transform .25s,box-shadow .25s}
.nav-download:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(240,61,116,.34)}

/* Hero */
.hero{background:linear-gradient(180deg,var(--bg-soft) 0%,var(--bg) 100%);padding:calc(var(--nav-h) + 48px) 0 40px}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.hero h1{font-size:44px;font-weight:800;color:var(--deep);line-height:1.25}
.ver-tag{display:inline-block;background:var(--primary-soft);color:var(--primary-deep);font-size:18px;font-weight:700;padding:4px 14px;border-radius:999px;vertical-align:middle;margin-left:10px}
.hero-intro{margin:20px 0 30px;font-size:17px;color:var(--muted);max-width:520px}
.btn-hero,.btn-main,.btn-dl{display:inline-flex;align-items:center;justify-content:center;gap:10px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-weight:600;box-shadow:0 10px 24px rgba(240,61,116,.28);transition:transform .25s,box-shadow .25s}
.btn-hero{font-size:18px;padding:16px 40px}
.btn-hero:hover,.btn-main:hover,.btn-dl:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(240,61,116,.38)}
.btn-main{font-size:16px;padding:14px 32px}

/* 聊天窗口 */
.chat{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow-hover);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;border-bottom:1px solid var(--border)}
.chat-avatar{width:52px;height:52px;border-radius:50%;object-fit:cover}
.chat-name{font-size:16px;font-weight:700;color:var(--deep);line-height:1.3}
.chat-status{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:6px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--green);display:inline-block}
.chat-body{background:var(--bg-soft);padding:18px;min-height:320px;max-height:380px;overflow-y:auto}
.msg{display:flex;gap:10px;margin-bottom:16px;align-items:flex-end}
.msg img{width:34px;height:34px;border-radius:50%;object-fit:cover;flex-shrink:0}
.msg p{max-width:78%;padding:11px 15px;border-radius:16px;font-size:14.5px;line-height:1.55}
.msg-ai p{background:#fff;border:1px solid var(--border);border-top-left-radius:4px}
.msg-user{flex-direction:row-reverse}
.msg-user p{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-top-right-radius:4px}
.msg-user .u-avatar{width:34px;height:34px;border-radius:50%;background:var(--deep);color:#fff;font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.chat-foot{display:flex;align-items:center;gap:10px;padding:12px 16px;border-top:1px solid var(--border)}
#chatInput{flex:1;border:1px solid var(--border);border-radius:999px;padding:10px 18px;font-size:14px;color:var(--text);background:var(--bg-soft);outline:none}
#chatInput::placeholder{color:var(--muted)}
.send-btn{width:44px;height:44px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 14px rgba(240,61,116,.3);transition:transform .2s,box-shadow .2s}
.send-btn:hover{transform:scale(1.06)}
.send-btn.disabled{background:#D9CBD6;box-shadow:none;cursor:default}
.send-btn.disabled:hover{transform:none}

/* 人设 */
.personas{padding-top:60px}
.personas h2{font-size:22px;font-weight:700;color:var(--deep);text-align:center;margin-bottom:28px}
.persona-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:18px}
.persona-card{padding:14px;text-align:center}
.persona-card img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:14px}
.persona-card p{margin-top:10px;font-size:14px;font-weight:600;color:var(--deep)}

/* 三步上手 */
.steps{background:var(--bg-soft)}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{text-align:center;padding:36px 28px}
.step-num{font-size:40px;font-weight:800;line-height:1}
.step-card h3{margin:14px 0 10px;font-size:20px;color:var(--deep)}
.step-card p{color:var(--muted);font-size:15px}

/* 产品介绍 */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.about-desc{font-size:16.5px;color:var(--muted);margin-bottom:24px}
.check-list li{position:relative;padding-left:34px;margin-bottom:14px;font-size:16px;font-weight:500}
.check-list li::before,.scene-list 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:12px;display:flex;align-items:center;justify-content:center}
.about-img img,.custom-img img{border-radius:var(--radius);box-shadow:var(--shadow-hover)}

/* 核心功能 */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{padding:30px 26px}
.f-icon{width:46px;height:46px;color:var(--primary);margin-bottom:16px}
.feature-card h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.pain{font-size:14px;font-weight:500;color:var(--primary-deep);background:var(--primary-soft);border-radius:10px;padding:8px 12px;margin-bottom:12px;line-height:1.5}
.feature-card>p:last-child{font-size:14.5px;color:var(--muted)}

/* 优势对比 */
.compare{background:var(--bg-soft)}
.table-scroll{overflow-x:auto;border-radius:var(--radius);box-shadow:var(--shadow);-webkit-overflow-scrolling:touch}
.compare-table{width:100%;min-width:640px;border-collapse:collapse;table-layout:fixed;background:var(--card);font-size:14.5px}
.compare-table th,.compare-table td{padding:15px 14px;border-bottom:1px solid var(--border);text-align:center;line-height:1.5}
.compare-table thead th{background:var(--deep);color:#fff;font-weight:600;font-size:15px}
.compare-table td:first-child{font-weight:600;color:var(--deep);text-align:left;padding-left:20px}
.compare-table .hl{background:var(--primary-soft);font-weight:600;color:var(--primary-deep)}
.compare-table tbody tr:hover{background:#FFF3F8}
.scroll-hint{display:none;text-align:center;color:var(--muted);font-size:14px;margin-top:12px}

/* 使用场景 */
.scene-list{display:grid;grid-template-columns:1fr 1fr;gap:12px 32px;max-width:860px;margin:0 auto 56px}
.scene-list li{position:relative;padding-left:34px;font-size:16px;line-height:1.6}
.vs-wrap{display:grid;grid-template-columns:1fr auto 1fr;gap:28px;align-items:stretch;max-width:980px;margin:0 auto}
.vs-card{padding:32px 30px}
.vs-card h3{font-size:20px;margin-bottom:18px;text-align:center}
.vs-bad h3{color:var(--muted)}
.vs-good h3{color:var(--primary-deep)}
.vs-card li{position:relative;padding-left:26px;margin-bottom:12px;font-size:15px}
.vs-bad li::before{content:"✕";position:absolute;left:0;top:0;width:20px;height:20px;border-radius:50%;background:#EEE7EC;color:var(--muted);font-size:11px;display:flex;align-items:center;justify-content:center}
.vs-good li::before{content:"✓";position:absolute;left:0;top:0;width:20px;height:20px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center}
.vs-badge{width:60px;height:60px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-weight:800;font-size:17px;letter-spacing:.5px;display:flex;align-items:center;justify-content:center;align-self:center;box-shadow:0 10px 24px rgba(240,61,116,.3)}

/* 数据 */
.stats{background:linear-gradient(135deg,var(--deep) 0%,#3A2452 100%)}
.stats .sec-title{color:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-num{font-size:46px;font-weight:800;line-height:1.2;background:linear-gradient(90deg,var(--primary),#FFB3CB);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat-label{margin-top:8px;color:#CBBBDD;font-size:15px}

/* 人设定制 */
.custom-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:center}.custom-text .sec-title{text-align:left;margin-bottom:20px}
.custom-text p{color:var(--muted);font-size:16.5px;margin-bottom:28px}

/* 评价 */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{padding:26px}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:18px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-name{font-weight:700;color:var(--deep);font-size:15px;line-height:1.4}
.stars{color:#FFB400;font-size:14px;letter-spacing:2px}
.review-card>p{font-size:14.5px;color:var(--muted)}

/* 隐私安全 */
.privacy{background:var(--bg-soft)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy-card{padding:30px 26px;text-align:center}
.p-icon{width:44px;height:44px;color:var(--primary);margin:0 auto 14px;display:block}
.privacy-card h3{font-size:18px;color:var(--deep);margin-bottom:10px}
.privacy-card p{font-size:14.5px;color:var(--muted)}

/* 版本更新 */
.update-card{max-width:720px;margin:0 auto;padding:36px}
.update-head{display:flex;align-items:baseline;justify-content:space-between;border-bottom:1px dashed var(--border);padding-bottom:16px;margin-bottom:20px}
.update-ver{font-size:28px;font-weight:800}
.update-date{font-size:14px;color:var(--muted)}
.update-list li{position:relative;padding-left:22px;margin-bottom:12px;font-size:15px}
.update-list li::before{content:"";position:absolute;left:2px;top:9px;width:8px;height:8px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep))}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{margin-bottom:16px;overflow:hidden}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 24px;font-size:16.5px;font-weight:600;color:var(--deep);text-align:left;transition:color .2s}
.faq-q:hover{color:var(--primary-deep)}
.faq-icon{position:relative;width:26px;height:26px;border-radius:50%;background:var(--primary-soft);flex-shrink:0}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;left:50%;top:50%;width:12px;height:2px;background:var(--primary-deep);border-radius:2px;transform:translate(-50%,-50%);transition:transform .25s}
.faq-icon::after{transform:translate(-50%,-50%) rotate(90deg)}
.faq-item.open .faq-icon::after{transform:translate(-50%,-50%) rotate(0deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a p{padding:0 24px 22px;font-size:15px;color:var(--muted)}

/* 下载 */
.download{text-align:center;padding:96px 0}
.dl-title{font-size:36px;font-weight:800;color:var(--deep)}
.dl-meta{font-size:14px;color:var(--muted);margin:14px 0 30px;white-space:nowrap}
.dl-btns{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}
.btn-dl{font-size:17px;padding:16px 34px}
.dl-tip{margin-top:26px;font-size:15px;font-weight:500;color:var(--primary-deep)}

/* 页脚 */
.footer{background:var(--deep);color:#CBBBDD;text-align:center;padding:34px 0;font-size:14px}
.footer-link{color:#fff;font-weight:600}

/* 返回顶部 */
.back-top{position:fixed;right:28px;bottom:32px;z-index:99;width:48px;height:48px;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(240,61,116,.32);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,visibility .3s}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{transform:translateY(-2px)}

/* 响应式 */
@media (max-width:1100px){
  .persona-grid{grid-template-columns:repeat(3,1fr)}
  .feature-grid,.privacy-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:38px}
  .sec-title{font-size:30px}
}
@media (max-width:900px){
  .menu{display:none}
  .hero{padding-top:calc(var(--nav-h) + 32px)}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-left{text-align:center}
  .hero-intro{margin-left:auto;margin-right:auto}
  .about-grid,.custom-grid{grid-template-columns:1fr;gap:36px}
  .custom-text{text-align:center}
  .custom-text .sec-title{text-align:center}
  .vs-wrap{grid-template-columns:1fr}
  .vs-badge{margin:0 auto;width:54px;height:54px}
}
@media (max-width:768px){
  section{padding:64px 0}
  .container{padding:0 20px}
  .nav{padding:0 20px}
  #chatInput{font-size:16px}
  .nav-download{min-height:44px;display:inline-flex;align-items:center}
  .hero h1{font-size:32px}
  .btn-hero{width:100%;max-width:420px}
  .btn-main{width:100%;max-width:420px}
  .scene-list{grid-template-columns:1fr}
  .steps-grid{grid-template-columns:1fr}
  .scroll-hint{display:block}
  .dl-btns{flex-direction:column;align-items:stretch;max-width:420px;margin:0 auto}
  .btn-dl{justify-content:center}
  .dl-meta{font-size:11px}
  .dl-tip{font-size:14px}
  .update-head{flex-direction:column;gap:6px}
}
@media (max-width:640px){
  .feature-grid,.privacy-grid,.review-grid,.stats-grid{grid-template-columns:1fr}
  .chat-body{min-height:250px;max-height:300px}
  .sec-title{font-size:26px;margin-bottom:36px}
  .stat-num{font-size:36px}
  .persona-card p{font-size:13px}
  .dl-title{font-size:28px}
  .back-top{right:16px;bottom:20px}
}