: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);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
.container{width:min(1200px,92%);margin-inline:auto}
.steps,.product,.features,.compare,.scenes,.persona-custom,.reviews,.privacy,.version,.faq{padding:80px 0}
.stats,.download{padding:84px 0}
.btn{display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border:none;border-radius:999px;font-weight:600;cursor:pointer;text-decoration:none;transition:transform .25s,box-shadow .25s;box-shadow:var(--shadow)}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-primary{padding:15px 34px;font-size:16px}
.sec-title{font-size:clamp(26px,3.2vw,36px);color:var(--deep);text-align:center;font-weight:800;line-height:1.35;margin-bottom:12px}
.sec-sub{color:var(--muted);text-align:center;margin-bottom:44px;font-size:15px}
.sec-title-light{color:#fff}

/* ===== 1. 导航栏 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:999;background:rgba(255,249,251,.94);backdrop-filter:blur(10px);transition:box-shadow .25s;border-bottom:1px solid transparent}
.nav.scrolled{box-shadow:0 6px 24px rgba(240,61,116,.1);border-bottom-color:var(--border)}
.nav-inner{width:min(1200px,92%);margin-inline:auto;height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-size:26px;font-weight:800;color:var(--deep);letter-spacing:.5px}
.logo-icon{width:26px;height:26px;color:var(--primary)}
.nav-menu{display:flex;gap:26px;align-items:center}
.nav-link{text-decoration:none;color:var(--text);font-size:15px;font-weight:500;padding:10px 4px;transition:color .2s;position:relative}
.nav-link:hover{color:var(--primary-deep)}
.btn-nav{padding:9px 20px;font-size:14px;min-height:40px}

/* ===== 2. Hero ===== */
.hero{background:linear-gradient(175deg,var(--bg-soft) 0%,var(--bg) 60%);padding:120px 0 70px;overflow:hidden}
.hero-main{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.hero-title{font-size:clamp(30px,4.2vw,44px);font-weight:800;color:var(--deep);line-height:1.3;margin-bottom:18px}
.hero-title .ver{display:inline-block;vertical-align:middle;margin-left:10px;font-size:.5em;font-weight:700;color:var(--primary-deep);background:var(--primary-soft);border-radius:999px;padding:5px 14px}
.hero-desc{color:var(--muted);font-size:16px;line-height:1.9;margin-bottom:28px;max-width:520px}
.btn-hero{padding:16px 38px;font-size:17px}
.hero-tip{color:var(--muted);font-size:13px;margin-top:16px}
.chat-wrap{display:flex;justify-content:center}
.chat{width:100%;max-width:420px;background:var(--card);border:1px solid var(--border);border-radius:24px;box-shadow:0 20px 50px rgba(240,61,116,.14);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 16px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff}
.chat-avatar{width:44px;height:44px;border-radius:50%;border:2px solid rgba(255,255,255,.85);object-fit:cover;flex:none}
.chat-head-info{display:flex;flex-direction:column;align-items:flex-start;line-height:1.35}
.chat-name{font-size:15px;font-weight:700}
.chat-status{font-size:12px;opacity:.92;display:inline-flex;align-items:center;gap:5px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 2px rgba(46,197,126,.3);flex:none}
.chat-body{display:flex;flex-direction:column;gap:10px;height:280px;overflow-y:auto;padding:16px;background:var(--bg)}
.msg{max-width:78%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.6;word-break:break-word;animation:msgIn .3s ease}
.msg p{margin:0}
@keyframes msgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg-ai{background:var(--card);border:1px solid var(--border);color:var(--text);border-radius:4px 16px 16px 16px;align-self:flex-start}
.msg-user{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:16px 4px 16px 16px;align-self:flex-end}
.typing{display:inline-flex;gap:4px;padding:12px 16px;background:var(--card);border:1px solid var(--border);border-radius:4px 16px 16px 16px;align-self:flex-start}
.typing i{width:6px;height:6px;border-radius:50%;background:var(--muted);animation:typing 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes typing{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;border-top:1px solid var(--border);background:var(--card)}
.chat-input input{flex:1;min-width:0;border:none;outline:none;background:var(--bg-soft);border-radius:999px;padding:11px 16px;font-size:13px;color:var(--muted)}
.chat-send{width:44px;height:44px;flex:none;border:none;border-radius:50%;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .2s,filter .2s}
.chat-send svg{width:20px;height:20px}
.chat-send:hover{transform:scale(1.06)}
.chat-send.disabled{background:#D8CDE0;cursor:not-allowed;transform:none}
.persona-strip{margin-top:64px}
.strip-title{font-size:clamp(18px,2.4vw,22px);color:var(--deep);font-weight:700;text-align:center;margin-bottom:24px}
.persona-list{display:grid;grid-template-columns:repeat(6,1fr);gap:18px}
.persona-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 10px 16px;text-align:center;transition:transform .25s,box-shadow .25s}
.persona-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.persona-card-custom{border-color:var(--primary)}
.persona-avatar img{width:96px;height:96px;border-radius:50%;margin:0 auto 12px;border:3px solid var(--primary-soft);object-fit:cover}
.persona-name{font-weight:700;color:var(--deep);font-size:15px}
.persona-tag{display:inline-block;margin-top:6px;font-size:12px;color:var(--primary-deep);background:var(--primary-soft);border-radius:999px;padding:3px 12px}

/* ===== 3. 三步上手 ===== */
.steps{background:var(--bg-soft)}
.step-grid{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:34px 28px;text-align:center;transition:transform .25s,box-shadow .25s}
.step-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:18px;font-weight:800;margin-bottom:18px}
.step-card h3{color:var(--deep);font-size:19px;margin-bottom:10px}
.step-card p{color:var(--muted);font-size:14px;line-height:1.8}

/* ===== 4. 产品介绍 ===== */
.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.product-media img{border-radius:24px;box-shadow:var(--shadow);width:100%}
.product-text .sec-title{text-align:left;margin-bottom:16px}
.product-lead{color:var(--muted);line-height:1.9;margin-bottom:26px}
.check-list{list-style:none}
.check-list li{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:500;color:var(--text);margin-bottom:14px}
.check-list svg{width:22px;height:22px;color:var(--primary-deep);flex:none}

/* ===== 5. 四大核心功能 ===== */
.features{background:var(--bg)}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 24px;transition:transform .25s,box-shadow .25s}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.feature-icon{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:16px}
.feature-icon svg{width:26px;height:26px}
.feature-card h3{color:var(--deep);font-size:18px;margin-bottom:12px}
.feature-pain{display:inline-block;font-size:13px;color:var(--primary-deep);background:var(--primary-soft);border-radius:10px;padding:5px 12px;margin-bottom:12px;line-height:1.5}
.feature-desc{color:var(--muted);font-size:14px;line-height:1.8}

/* ===== 6. 优势对比 ===== */
.compare{background:var(--bg-soft)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--radius);background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow)}
.compare-table{width:100%;min-width:640px;border-collapse:collapse;font-size:14.5px}
.compare-table th,.compare-table td{padding:15px 16px;text-align:left;white-space:nowrap;border-bottom:1px solid var(--border)}
.compare-table thead th{background:var(--deep);color:#fff;font-weight:600;white-space:nowrap}
.compare-table tbody th{color:var(--deep);font-weight:600;background:var(--bg)}
.compare-table tbody tr:last-child th,.compare-table tbody tr:last-child td{border-bottom:none}
.compare-table td{color:var(--muted)}
.compare-table th.col-best{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff}
.compare-table td.col-best{background:var(--primary-soft);color:var(--primary-deep);font-weight:600}
.table-hint{display:none;text-align:center;color:var(--muted);font-size:12px;margin-top:10px}

/* ===== 7. 使用场景 ===== */
.scene-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:56px}
.scene-list li{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);padding:14px 18px;font-size:14.5px;color:var(--text)}
.scene-list svg{width:22px;height:22px;color:var(--primary-deep);flex:none}
.vs-wrap{display:grid;grid-template-columns:1fr auto 1fr;gap:26px;align-items:center}
.vs-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:30px 28px;transition:transform .25s,box-shadow .25s}
.vs-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.vs-card h3{text-align:center;font-size:19px;color:var(--deep);margin-bottom:16px}
.vs-card ul{list-style:none}
.vs-card li{position:relative;padding-left:18px;color:var(--muted);font-size:14px;line-height:1.9;margin-bottom:8px}
.vs-card li::before{content:"";position:absolute;left:0;top:11px;width:7px;height:7px;border-radius:50%;background:var(--primary)}
.vs-together{border-color:var(--primary);background:linear-gradient(180deg,var(--bg) 0%,var(--primary-soft) 130%)}
.vs-together li::before{background:var(--green)}
.vs-badge{width:58px;height:58px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;font-size:17px;font-weight:800;box-shadow:var(--shadow);margin:0 auto}

/* ===== 8. 数据模块 ===== */
.stats{background:var(--deep)}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-item{text-align:center}
.stat-num{display:block;font-size:clamp(36px,4.6vw,50px);font-weight:800;color:#fff;line-height:1.2;margin-bottom:8px}
.stat-item p{color:rgba(255,255,255,.72);font-size:14px}

/* ===== 9. 人设定制 ===== */
.persona-custom{background:var(--bg)}
.persona-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.persona-text .sec-title{text-align:left;margin-bottom:16px}
.persona-lead{color:var(--muted);line-height:1.9;margin-bottom:28px}
.persona-media img{border-radius:24px;box-shadow:var(--shadow);width:100%}

/* ===== 10. 用户评价 ===== */
.reviews{background:var(--bg-soft)}
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;transition:transform .25s,box-shadow .25s}
.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.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:19px;font-weight:700;display:flex;align-items:center;justify-content:center;flex:none}
.review-info{display:flex;flex-direction:column}
.review-name{font-size:15px;font-weight:600;color:var(--deep)}
.review-stars{font-size:13px;color:#FFB400;letter-spacing:2px;margin-top:2px}
.review-text{color:var(--muted);font-size:14px;line-height:1.8}

/* ===== 11. 隐私安全 ===== */
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.privacy-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 24px;text-align:center;transition:transform .25s,box-shadow .25s}
.privacy-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.privacy-icon{width:56px;height:56px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.privacy-icon svg{width:28px;height:28px}
.privacy-card h3{color:var(--deep);font-size:16.5px;margin-bottom:10px}
.privacy-card p{color:var(--muted);font-size:14px;line-height:1.8}

/* ===== 12. 版本更新 ===== */
.version{background:var(--bg)}
.version-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:34px;max-width:820px;margin-inline:auto}
.version-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:22px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.version-no{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-size:20px;font-weight:800;border-radius:12px;padding:8px 18px}
.version-date{color:var(--muted);font-size:14px}
.version-log{list-style:none}
.version-log li{position:relative;padding-left:22px;color:var(--text);font-size:14.5px;line-height:1.9;margin-bottom:10px}
.version-log li::before{content:"";position:absolute;left:4px;top:11px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

/* ===== 13. FAQ ===== */
.faq{background:var(--bg-soft)}
.faq-list{max-width:780px;margin-inline: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:none;padding:18px 22px;font-size:15.5px;font-weight:600;color:var(--deep);cursor:pointer;text-align:left;font-family:inherit}
.faq-q svg{width:22px;height:22px;color:var(--primary-deep);flex:none;transition:transform .3s}
.faq-item.open .faq-q svg{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:300px}
.faq-a p{padding:0 22px 18px;color:var(--muted);font-size:14.5px;line-height:1.9}

/* ===== 14. 下载区域 ===== */
.download{background:linear-gradient(165deg,var(--primary-soft) 0%,var(--bg) 55%);text-align:center}
.dl-title{font-size:clamp(28px,4vw,40px);font-weight:800;color:var(--deep);line-height:1.35;margin-bottom:14px}
.dl-title .ver{display:inline-block;vertical-align:middle;margin-left:10px;font-size:.5em;font-weight:700;color:var(--primary-deep);background:var(--card);border:1px solid var(--border);border-radius:999px;padding:5px 14px}
.dl-meta{color:var(--muted);font-size:15px;margin-bottom:30px}
.dl-btns{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}
.btn-dl{min-width:250px;padding:16px 30px;font-size:16px}
.dl-tip{color:var(--muted);font-size:14px;margin-top:22px}

/* ===== 15. 页脚 ===== */
.footer{background:var(--deep);padding:28px 0;text-align:center}
.footer-copy{color:rgba(255,255,255,.72);font-size:14px}
.footer-link{color:#fff;font-weight:600;text-decoration:none}

/* ===== 16. 返回顶部 ===== */
.back-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border:none;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-hover);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,visibility .3s;z-index:998}
.back-top svg{width:22px;height:22px}
.back-top.show{opacity:1;visibility:visible;transform:none}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .persona-list{grid-template-columns:repeat(3,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .privacy-grid{grid-template-columns:repeat(2,1fr)}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .nav-menu{gap:18px}
}
@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding-top:104px}
  .hero-main{grid-template-columns:1fr;gap:44px}
  .hero-text{text-align:center}
  .hero-desc{margin-inline:auto}
  .chat-wrap{max-width:460px;margin-inline:auto;width:100%}
  .product-grid{grid-template-columns:1fr;gap:36px}
  .persona-grid{grid-template-columns:1fr;gap:36px}
  .persona-text .btn-primary{display:flex;margin-inline:auto}
  .vs-wrap{grid-template-columns:1fr;gap:18px}
}
@media (max-width:768px){
  .container{width:100%;padding-inline:20px}
  .logo,.btn-nav{min-height:44px}
  .table-hint{display:block}
  .dl-meta{font-size:12px;white-space:nowrap}
  .dl-btns{flex-direction:column}
  .btn-dl{width:100%;min-width:0}
  .scene-list{grid-template-columns:1fr}
  .steps,.product,.features,.compare,.scenes,.stats,.persona-custom,.reviews,.privacy,.version,.faq,.download{padding:60px 0}
  .sec-sub{margin-bottom:34px}
}
@media (max-width:640px){
  .step-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .privacy-grid{grid-template-columns:1fr}
  .chat-body{height:230px}
  .persona-avatar img{width:80px;height:80px}
  .persona-card{padding:16px 8px 12px}
  .btn-hero{width:100%;max-width:420px;margin-inline:auto}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .msg,.typing i{animation:none}
}