/* ===== 变量与基础 ===== */
: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;
  --star:#FFB020;
  --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) + 8px)}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,sans-serif;color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
ul,ol{list-style:none}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;border:none;background:none;cursor:pointer;color:inherit}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
section{padding:76px 0}

/* ===== 通用按钮 / 卡片 / 模块头 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-size:16px;font-weight:600;padding:14px 34px;box-shadow:0 8px 20px rgba(240,61,116,.22);transition:transform .25s,box-shadow .25s}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(240,61,116,.32)}
.btn-lg{font-size:17px;padding:16px 40px}
.sec-head{text-align:center;max-width:680px;margin:0 auto 46px}
.sec-tag{display:inline-block;background:var(--primary-soft);color:var(--primary-deep);font-size:14px;font-weight:600;padding:6px 18px;border-radius:999px;margin-bottom:16px}
.sec-title{font-size:34px;color:var(--deep);font-weight:800;line-height:1.3}
.sec-sub{color:var(--muted);margin-top:12px;font-size:16px}
.ck{flex-shrink:0;width:22px;height:22px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);display:inline-flex;align-items:center;justify-content:center;margin-top:2px}
.x-ic{flex-shrink:0;width:22px;height:22px;border-radius:50%;background:#EDE6F2;color:#9A8CA8;display:inline-flex;align-items:center;justify-content:center;margin-top:2px}

/* ===== 1.导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.95);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 6px 24px rgba(240,61,116,.10)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.nav-logo{display:flex;align-items:center;gap:8px;font-size:20px;font-weight:800;color:var(--deep);white-space:nowrap}
.nav-logo svg{color:var(--primary-deep);flex-shrink:0}
.nav-menu{display:flex;align-items:center;gap:26px}
.nav-menu a{font-size:15px;color:var(--text);padding:6px 2px;transition:color .2s}
.nav-menu a:hover{color:var(--primary-deep)}
.nav-btn{display:inline-flex;align-items:center;justify-content:center;text-align:center;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-size:14px;font-weight:600;padding:9px 22px;min-height:40px;box-shadow:0 6px 16px rgba(240,61,116,.2);transition:transform .25s,box-shadow .25s}
.nav-btn:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(240,61,116,.3)}

/* ===== 2.Hero ===== */
.hero{background:var(--bg-soft);padding:calc(var(--nav-h) + 44px) 0 72px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:44px;line-height:1.25;color:var(--deep);font-weight:800}
.hero h1 .ver,.dl-title .ver{display:inline-block;font-size:15px;font-weight:700;color:var(--primary-deep);background:var(--primary-soft);border:1px solid var(--border);border-radius:999px;padding:4px 14px}
.hero h1 .ver{vertical-align:10px;margin-left:12px}
.hero-desc{margin:22px 0 30px;font-size:17px;color:var(--muted);max-width:520px}
.hero-trust{margin-top:18px;font-size:13px;color:var(--muted)}
.chat-card{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow);overflow:hidden;max-width:430px;margin-left:auto}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:var(--primary);color:#fff}
.chat-avatar{width:44px;height:44px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.75)}
.chat-meta{line-height:1.35;min-width:0}
.chat-name{font-size:16px;font-weight:700}
.chat-status{font-size:12px;opacity:.94;display:flex;align-items:center;gap:6px;white-space:nowrap}
.dot{width:8px;height:8px;border-radius:50%;background:var(--green);flex-shrink:0;box-shadow:0 0 0 3px rgba(46,197,126,.25)}
.chat-body{height:318px;overflow-y:auto;padding:18px;background:var(--bg-soft);display:flex;flex-direction:column;gap:12px}
.msg{display:flex;gap:8px;align-items:flex-end;animation:pop .3s ease}
.msg-user{justify-content:flex-end}
.msg-avatar{width:30px;height:30px;border-radius:50%;object-fit:cover;flex-shrink:0}
.bubble{max-width:78%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.55}
.msg-ai .bubble{background:var(--card);border:1px solid var(--border);border-top-left-radius:4px;color:var(--text)}
.msg-user .bubble{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-top-right-radius:4px}
@keyframes pop{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.chat-input{display:flex;gap:10px;padding:12px 14px;background:var(--card);border-top:1px solid var(--border)}
.chat-input input{flex:1;min-width:0;border:1px solid var(--border);background:var(--bg-soft);border-radius:999px;padding:10px 16px;font-size:16px;color:var(--muted);outline:none}
.send-btn{flex-shrink:0;min-width:76px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-size:14px;font-weight:600;padding:10px 18px;transition:opacity .25s,background .25s,color .25s}
.send-btn.disabled{background:var(--border);color:var(--muted);cursor:not-allowed}
.persona-wrap{margin-top:60px;text-align:center}
.persona-title{font-size:19px;font-weight:700;color:var(--deep);margin-bottom:26px}
.persona-list{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.persona-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px 10px 16px;transition:transform .25s,box-shadow .25s}
.persona-item:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.persona-item img{width:92px;height:92px;border-radius:50%;object-fit:cover;margin:0 auto 12px;border:3px solid var(--primary-soft)}
.persona-item p{font-size:13px;font-weight:600;color:var(--text)}

/* ===== 3.三步上手 ===== */
.steps{background:var(--bg)}
.steps-list{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:36px 30px;transition:transform .25s,box-shadow .25s}
.step-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.step-num{width:52px;height:52px;border-radius:16px;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;margin-bottom:20px}
.step-card h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.step-card p{color:var(--muted);font-size:15px}

/* ===== 4.产品介绍 ===== */
.product{background:var(--bg-soft)}
.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.product-img{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow)}
.product-txt h3{font-size:28px;color:var(--deep);font-weight:800;line-height:1.35;margin-bottom:16px}
.product-txt>p{color:var(--muted);font-size:16px;margin-bottom:24px}
.points li{display:flex;gap:12px;align-items:flex-start;margin-bottom:14px;font-size:15px;color:var(--text)}

/* ===== 5.核心功能 ===== */
.features{background:var(--bg)}
.feat-list{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feat-card,.privacy-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:30px 26px;transition:transform .25s,box-shadow .25s}
.feat-card:hover,.privacy-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.feat-ic{width:52px;height:52px;border-radius:16px;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feat-card h3,.privacy-card h3{font-size:18px;color:var(--deep);margin-bottom:12px}
.feat-pain{font-size:13.5px;color:var(--muted);margin-bottom:10px;line-height:1.55}
.pain-tag{display:inline-block;background:var(--primary-soft);color:var(--primary-deep);font-size:12px;font-weight:600;padding:2px 9px;border-radius:6px;margin-right:8px}
.feat-desc{font-size:14.5px;color:var(--text);line-height:1.7}

/* ===== 6.优势对比 ===== */
.compare{background:var(--bg-soft)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);background:var(--card)}
.cmp-table{width:100%;min-width:640px;table-layout:fixed;border-collapse:collapse;font-size:14.5px}
.cmp-table thead th{padding:16px 14px;font-weight:700;color:var(--deep);background:var(--bg-soft);border-bottom:1px solid var(--border);text-align:center}
.cmp-table thead th:first-child{text-align:left}
.cmp-table thead th.hot{background:var(--primary);color:#fff}
.cmp-table tbody td{padding:15px 14px;border-bottom:1px solid var(--bg-soft);text-align:center;color:var(--text)}
.cmp-table tbody tr:last-child td{border-bottom:none}
.cmp-table tbody td:first-child{text-align:left;color:var(--muted);font-weight:600}
.cmp-table tbody td.hot{background:var(--primary-soft);color:var(--primary-deep);font-weight:700}
.table-tip{display:none;text-align:center;color:var(--muted);font-size:13px;margin-top:12px}

/* ===== 7.使用场景 ===== */
.scene{background:var(--bg)}
.scene-list{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:34px 40px}
.scene-list li{display:flex;gap:12px;align-items:center;padding:11px 0;font-size:16px;color:var(--text)}
.scene-list li+li{border-top:1px dashed var(--border)}
.vs-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:28px;align-items:center;margin-top:52px}
.vs-card{border-radius:var(--radius);padding:34px 30px;box-shadow:var(--shadow)}
.vs-card.bad{background:var(--card);border:1px solid var(--border)}
.vs-card.good{background:var(--primary-soft);border:1px solid var(--primary)}
.vs-card h3{font-size:19px;font-weight:800;margin-bottom:18px;display:flex;align-items:center;gap:8px}
.vs-card.bad h3{color:var(--muted)}
.vs-card.good h3{color:var(--primary-deep)}
.vs-card li{display:flex;gap:10px;align-items:flex-start;margin-bottom:12px;font-size:15px;color:var(--text)}
.vs-badge{width:64px;height:64px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:800;letter-spacing:1px;box-shadow:0 8px 20px rgba(240,61,116,.3)}

/* ===== 8.数据模块 ===== */
.data-sec{background:var(--deep)}
.data-sec .sec-title{color:#fff}
.data-sec .sec-sub{color:rgba(255,255,255,.7)}
.data-sec .sec-tag{background:rgba(255,255,255,.14);color:#FFB9D1}
.data-list{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;text-align:center}
.data-item{padding:10px 0}
.data-num{font-size:46px;font-weight:800;color:#FF8FB3;line-height:1.2}
.data-label{color:rgba(255,255,255,.78);font-size:15px;margin-top:8px}

/* ===== 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-txt h3{font-size:28px;color:var(--deep);font-weight:800;line-height:1.35;margin-bottom:16px}
.custom-txt>p{color:var(--muted);font-size:16px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 30px}
.chip{background:var(--card);border:1px solid var(--border);color:var(--primary-deep);font-size:13.5px;font-weight:600;padding:8px 16px;border-radius:999px}
.custom-img{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow)}

/* ===== 10.用户评价 ===== */
.reviews{background:var(--bg)}
.rev-list{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.rev-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;transition:transform .25s,box-shadow .25s}
.rev-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.rev-top{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.rev-av{width:46px;height:46px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;flex-shrink:0}
.rev-name{font-size:15px;font-weight:700;color:var(--deep)}
.rev-stars{color:var(--star);font-size:14px;letter-spacing:2px;margin-top:2px}
.rev-text{font-size:14.5px;color:var(--text);line-height:1.75}

/* ===== 11.隐私安全 ===== */
.privacy{background:var(--bg-soft)}
.privacy-list{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}

/* ===== 12.版本更新 ===== */
.version{background:var(--bg)}
.ver-card{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:40px}
.ver-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;border-bottom:1px solid var(--bg-soft);padding-bottom:20px;margin-bottom:22px}
.ver-badge{font-size:20px;font-weight:800;color:#fff;background:var(--primary);padding:8px 20px;border-radius:14px}
.ver-date{color:var(--muted);font-size:14px}
.ver-log li{display:flex;gap:10px;padding:10px 0;font-size:15px;color:var(--text);border-bottom:1px dashed var(--bg-soft)}
.ver-log li:last-child{border-bottom:none}
.dot-b{flex-shrink:0;width:8px;height:8px;border-radius:50%;background:var(--primary);margin-top:9px}

/* ===== 13.FAQ ===== */
.faq{background:var(--bg-soft)}
.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:14px;overflow:hidden;transition:box-shadow .25s}
.faq-item.open{box-shadow:var(--shadow)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 22px;font-size:16px;font-weight:600;color:var(--deep);text-align:left}
.faq-q .ic{flex-shrink:0;width:22px;height:22px;color:var(--primary-deep);transition:transform .3s}
.faq-item.open .faq-q .ic{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:260px}
.faq-a-inner{padding:0 22px 20px;font-size:15px;color:var(--muted);line-height:1.75}

/* ===== 14.下载区域 ===== */
.dl-sec{background:var(--bg-soft)}
.dl-card{max-width:860px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:24px;box-shadow:var(--shadow);padding:56px 40px;text-align:center}
.dl-title{font-size:40px;color:var(--deep);font-weight:800;display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap}
.dl-title .ver{display:inline-block;font-size:15px;font-weight:700;color:var(--primary-deep);background:var(--primary-soft);border:1px solid var(--border);border-radius:999px;padding:4px 14px}
.dl-info{margin:16px 0 30px;color:var(--muted);font-size:15px}
.dl-btns{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.dl-tip{margin-top:24px;font-size:14px;color:var(--primary-deep)}

/* ===== 15.页脚 ===== */
.footer{background:var(--deep);color:rgba(255,255,255,.7);text-align:center;padding:28px 0;font-size:14px}
.footer a{color:#fff;font-weight:600}

/* ===== 16.返回顶部 ===== */
.to-top{position:fixed;right:24px;bottom:24px;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 8px 20px rgba(240,61,116,.3);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,visibility .3s;z-index:90}
.to-top.show{opacity:1;visibility:visible;transform:none}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .sec-title{font-size:28px}
  .hero h1{font-size:38px}
  .persona-list{grid-template-columns:repeat(3,1fr)}
  .feat-list,.privacy-list{grid-template-columns:repeat(2,1fr)}
  .data-list{grid-template-columns:repeat(2,1fr)}
  .rev-list{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding-top:calc(var(--nav-h) + 20px)}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-l{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .chat-card{margin:0 auto;max-width:460px;width:100%}
  .product-grid,.custom-grid{grid-template-columns:1fr;gap:36px}
  .product-img,.custom-img{width:100%;max-width:480px;margin:0 auto}
  .vs-grid{grid-template-columns:1fr;gap:18px}
  .vs-badge{margin:0 auto}
}
@media (max-width:768px){
  .container{padding:0 20px}
  section{padding:60px 0}
  .sec-title{font-size:26px}
  .hero h1{font-size:32px}
  .hero-desc{font-size:16px}
  .hero .btn{width:100%;max-width:420px;margin:0 auto}
  .custom .btn{width:100%;max-width:420px;margin:0 auto}
  .nav-btn{min-height:44px;padding:10px 22px}
  .send-btn{min-height:44px}
  .chat-body{height:272px}
  .cmp-table{min-width:640px}
  .table-tip{display:block}
  .dl-btns{flex-direction:column}
  .dl-btns .btn{width:100%}
  .dl-info{font-size:13px}
  .dl-title{font-size:30px}
  .ver-head{flex-direction:column;align-items:flex-start}
}
@media (max-width:640px){
  .feat-list,.privacy-list,.rev-list,.steps-list{grid-template-columns:1fr}
  .data-num{font-size:34px}
  .persona-item img{width:76px;height:76px}
  .persona-title{font-size:17px}
  .scene-list{padding:24px 20px}
  .dl-card{padding:40px 22px}
  .dl-title{font-size:26px}
  .to-top{right:16px;bottom:16px}
}