: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;
  --gap:20px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px)}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;padding:0;color:inherit}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
::selection{background:var(--primary-soft);color:var(--primary-deep)}

.container{max-width:1200px;margin:0 auto;padding:0 24px}
.sec{padding:88px 0}
.sec-alt{background:var(--bg-soft)}
.sec-title{margin:0 0 10px;font-size:34px;font-weight:800;color:var(--deep);line-height:1.35;text-align:center}
.sec-title.light{color:#fff}
.sec-title.left{text-align:left}
.sec-sub{margin:0 0 48px;text-align:center;color:var(--muted);font-size:16px}
.sec-text{margin:0 0 28px;color:var(--muted);font-size:16px}

.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;font-weight:600;transition:transform .25s,box-shadow .25s;box-shadow:0 8px 20px rgba(240,61,116,.28)}
.btn:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(240,61,116,.38)}
.btn-download{padding:15px 34px;font-size:16px}
.btn-download svg{flex:none}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.96);border-bottom:1px solid var(--border);transition:box-shadow .25s}
.nav.scrolled{box-shadow:0 6px 24px rgba(240,61,116,.10)}
.nav-inner{max-width:1200px;margin:0 auto;height:var(--nav-h);padding:0 24px;display:flex;align-items:center;gap:18px}
.nav-logo{display:flex;align-items:center;gap:7px;font-size:24px;font-weight:800;color:var(--deep);letter-spacing:-.5px;min-height:44px}
.nav-logo-icon{flex:none}
.nav-links{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-link{font-size:13.5px;color:var(--text);padding:6px 9px;border-radius:9px;transition:color .2s,background .2s;white-space:nowrap}
.nav-link:hover{color:var(--primary);background:var(--primary-soft)}
.nav-download{font-size:13px;padding:8px 16px;margin-left:4px;min-height:44px}

/* ===== Hero ===== */
.hero{padding:calc(var(--nav-h) + 64px) 0 88px;background:linear-gradient(180deg,var(--bg-soft) 0%,var(--bg) 100%);overflow:hidden}
.hero-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center}
.hero-title{margin:0 0 20px;font-size:46px;font-weight:800;color:var(--deep);line-height:1.25;letter-spacing:-1px;background:linear-gradient(90deg,var(--primary-deep),var(--primary));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-version{display:inline-block;margin-left:10px;padding:4px 14px;font-size:15px;font-weight:700;color:#fff;background:linear-gradient(90deg,var(--primary),var(--primary-deep));border-radius:999px;vertical-align:middle;letter-spacing:0}
.hero-sub{margin:0 0 30px;font-size:17px;color:var(--muted);line-height:1.9;max-width:34em}
.hero-download{margin-top:6px}

.persona-pick-title{margin:0 0 14px;font-size:15px;font-weight:600;color:var(--text)}
.persona-pick-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;max-width:520px;margin-bottom:6px}
.persona-item{margin:0;text-align:center}
.persona-item img{width:64px;height:64px;border-radius:50%;object-fit:cover;border:3px solid #fff;box-shadow:0 6px 16px rgba(240,61,116,.18);transition:transform .25s;margin:0 auto}
.persona-item:hover img{transform:translateY(-4px)}
.persona-item figcaption{margin-top:8px;font-size:12.5px;color:var(--text)}

/* 聊天窗口 */
.chat-card{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:0 20px 50px rgba(240,61,116,.14);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:linear-gradient(90deg,var(--primary),var(--primary-deep))}
.chat-avatar{width:44px;height:44px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.85);flex:none}
.chat-head-info{line-height:1.4}
.chat-name{margin:0;color:#fff;font-size:15px;font-weight:700}
.chat-status{margin:0;font-size:13px;color:rgba(255,255,255,.92);display:flex;align-items:center;gap:6px}
.chat-dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.35);flex:none}
.chat-body{height:340px;padding:18px 18px 10px;background:linear-gradient(180deg,#FBF0F6 0%,#F4ECFB 100%);overflow-y:auto;display:flex;flex-direction:column;gap:12px}
.msg{max-width:80%;padding:10px 14px;font-size:14px;line-height:1.7;border-radius:16px;animation:msgIn .35s ease}
@keyframes msgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.msg-ai{background:#fff;border:1px solid var(--border);border-bottom-left-radius:5px;align-self:flex-start}
.msg-user{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:5px;align-self:flex-end}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;background:#fff;border-top:1px solid var(--border)}
.chat-field{flex:1;min-width:0;height:42px;padding:0 18px;font-size:14px;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:999px;outline:none}
.chat-field:focus{border-color:var(--primary)}
.chat-send{flex:none;width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;background:linear-gradient(90deg,var(--primary),var(--primary-deep));transition:background .25s,transform .25s}
.chat-send:hover{transform:scale(1.06)}
.chat-send.is-disabled{background:#D9CFE2;cursor:not-allowed;transform:none}

/* ===== 三步上手 ===== */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{padding:34px 30px;position:relative}
.step-num{position:absolute;top:24px;right:26px;font-size:40px;font-weight:800;color:var(--primary-soft);line-height:1}
.step-icon{width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;color:var(--primary);background:var(--primary-soft);margin-bottom:20px}
.card-title{margin:0 0 10px;font-size:19px;font-weight:700;color:var(--deep)}
.card-text{margin:0;font-size:14.5px;color:var(--muted)}

/* ===== 产品介绍 ===== */
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.split-media img{width:100%;height:auto;border-radius:22px;box-shadow:var(--shadow-hover)}
.check-list{display:flex;flex-direction:column;gap:22px}
.check-list li{display:flex;gap:14px;align-items:flex-start}
.check-icon{flex:none;width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;background:linear-gradient(90deg,var(--primary),var(--primary-deep));margin-top:3px}
.check-list strong{display:block;font-size:16px;color:var(--deep);margin-bottom:3px}
.check-list p{margin:0;font-size:14px;color:var(--muted)}

/* ===== 核心功能 ===== */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{padding:30px 26px;display:flex;flex-direction:column}
.feature-icon{width:52px;height:52px;border-radius:15px;display:flex;align-items:center;justify-content:center;color:var(--primary);background:var(--primary-soft);margin-bottom:18px}
.feature-pain{margin:0 0 10px;font-size:13px;font-weight:600;color:var(--primary-deep);background:var(--primary-soft);border-radius:999px;padding:4px 12px;align-self:flex-start}

/* ===== 优势对比 ===== */
.compare-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--radius)}
.compare-table{width:100%;min-width:640px;border-collapse:separate;border-spacing:0;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;font-size:14.5px;text-align:center}
.compare-table th,.compare-table td{padding:15px 14px;border-bottom:1px solid var(--border);white-space:nowrap}
.compare-table thead th{background:var(--bg-soft);font-weight:700;color:var(--deep)}
.compare-table tbody tr:last-child th,.compare-table tbody tr:last-child td{border-bottom:0}
.compare-table tbody th{font-weight:600;color:var(--deep);background:var(--bg);text-align:center}
.compare-table tbody td:nth-child(2){color:var(--primary-deep);font-weight:600;background:var(--primary-soft)}
.brand-pill{display:inline-block;padding:3px 14px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-size:13px;font-weight:700}
.compare-hint{display:none;margin:12px 0 0;text-align:center;font-size:13px;color:var(--muted)}

/* ===== 使用场景 ===== */
.scene-chips{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-bottom:52px}
.scene-chips li{padding:10px 22px;border-radius:999px;background:var(--card);border:1px solid var(--border);color:var(--text);font-size:14.5px;font-weight:600;box-shadow:var(--shadow)}
.vs-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:24px;align-items:center}
.vs-card{padding:32px 30px}
.vs-card li{position:relative;padding-left:26px;margin-bottom:14px;font-size:14.5px;color:var(--text)}
.vs-card li:last-child{margin-bottom:0}
.vs-card li::before{content:"";position:absolute;left:0;top:7px;width:12px;height:12px;border-radius:4px}
.vs-alone{background:var(--bg);border-color:var(--border)}
.vs-alone li::before{background:#CBBFD6}
.vs-accompany{background:var(--primary-soft);border-color:var(--primary)}
.vs-accompany li::before{background:linear-gradient(90deg,var(--primary),var(--primary-deep))}
.vs-title{margin:0 0 18px;font-size:18px;font-weight:700;color:var(--deep)}
.vs-badge{width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:800;color:#fff;background:linear-gradient(90deg,var(--primary),var(--primary-deep));box-shadow:var(--shadow-hover)}

/* ===== 数据 ===== */
.data-sec{background:linear-gradient(135deg,var(--deep) 0%,#3A2453 60%,#4A2C63 100%);color:#fff}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.data-item{text-align:center;padding:34px 20px;border-radius:var(--radius);background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12)}
.data-num{margin:0 0 8px;font-size:44px;font-weight:800;line-height:1.15;color:#fff}
.data-suffix{font-size:22px;font-weight:700;color:var(--primary);margin-left:2px}
.data-label{margin:0;font-size:14px;color:rgba(255,255,255,.75)}

/* ===== 用户评价 ===== */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{padding:28px 26px}
.review-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.review-avatar{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;color:var(--primary-deep);background:var(--primary-soft);flex:none}
.review-name{margin:0;font-size:15px;font-weight:700;color:var(--deep)}
.review-stars{margin:2px 0 0;font-size:13px;color:#FFB020;letter-spacing:2px}
.review-text{margin:0;font-size:14px;color:var(--muted);line-height:1.8}

/* ===== 隐私安全 ===== */
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy-card{padding:30px 26px}
.privacy-icon{width:50px;height:50px;border-radius:15px;display:flex;align-items:center;justify-content:center;color:var(--primary);background:var(--primary-soft);margin-bottom:18px}
.privacy-card .card-title{margin-bottom:8px}

/* ===== 版本更新 ===== */
.update-card{max-width:820px;margin:0 auto;padding:40px 44px}
.update-head{display:flex;align-items:center;gap:16px;margin-bottom:24px}
.update-version{margin-left:0}
.update-date{font-size:14px;color:var(--muted)}
.update-list{display:flex;flex-direction:column;gap:16px}
.update-list li{display:flex;align-items:flex-start;gap:12px;font-size:15px;color:var(--text);line-height:1.7}
.update-tag{flex:none;font-size:12.5px;font-weight:700;border-radius:999px;padding:2px 10px;margin-top:3px}
.tag-new{color:#fff;background:linear-gradient(90deg,var(--primary),var(--primary-deep))}
.tag-opt{color:#8B5CF6;background:#F1EAFE}
.tag-fix{color:#0E9F6E;background:#E3F8EE}

/* ===== FAQ ===== */
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.faq-item{overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;font-size:16px;font-weight:600;color:var(--deep);text-align:left}
.faq-icon{flex:none;color:var(--primary);transition:transform .3s}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a-inner{padding:0 24px 22px;font-size:14.5px;color:var(--muted);line-height:1.85}

/* ===== 下载区域 ===== */
.download-sec{background:linear-gradient(180deg,var(--bg-soft) 0%,var(--bg) 100%);text-align:center}
.download-title{margin:0 0 14px;font-size:40px;font-weight:800;color:var(--deep);letter-spacing:-1px}
.download-meta{margin:0 0 34px;font-size:14px;color:var(--muted)}
.download-btns{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}
.download-tip{margin:26px 0 0;font-size:14.5px;color:var(--muted)}

/* ===== 页脚 ===== */
.footer{background:var(--deep);color:rgba(255,255,255,.82);padding:40px 0;text-align:center}
.footer-brand{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 10px;font-size:20px;font-weight:800;color:#fff}
.footer-brand:hover{color:var(--primary)}
.footer-copy{margin:10px 0 0;font-size:13px;color:rgba(255,255,255,.6)}

/* ===== 返回顶部 ===== */
.back-top{position:fixed;right:24px;bottom:24px;z-index:99;width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;background:linear-gradient(90deg,var(--primary),var(--primary-deep));box-shadow:0 10px 24px rgba(240,61,116,.35);opacity:0;pointer-events:none;transition:opacity .3s,transform .3s}
.back-top.show{opacity:1;pointer-events:auto}
.back-top:hover{transform:translateY(-3px)}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .sec{padding:72px 0}
  .sec-title{font-size:30px}
  .hero-title{font-size:40px}
  .hero{padding-top:calc(var(--nav-h) + 48px)}
  .hero-inner{gap:40px}
  .persona-pick-grid{grid-template-columns:repeat(3,1fr);gap:18px;max-width:none}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .privacy-grid{grid-template-columns:repeat(2,1fr)}
  .data-grid{grid-template-columns:repeat(2,1fr);gap:18px}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .split{gap:40px}
}

@media (max-width:900px){
  .nav-links{display:none}
  .nav-download{margin-left:auto}
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-copy{order:1}
  .chat-card{order:2;max-width:560px;width:100%;margin:0 auto}
  .split{grid-template-columns:1fr;gap:36px}
  .vs-grid{grid-template-columns:1fr;gap:20px}
  .vs-badge{margin:0 auto}
  .steps-grid{gap:20px}
  .sec-sub{margin-bottom:36px}
}

@media (max-width:768px){
  .container,.nav-inner,.hero-inner{padding-left:var(--gap);padding-right:var(--gap)}
  .sec{padding:60px 0}
  .sec-title{font-size:26px}
  .hero{padding-top:calc(var(--nav-h) + 36px);padding-bottom:64px}
  .hero-title{font-size:32px}
  .hero-sub{font-size:15.5px}
  .hero-download{width:100%}
  .steps-grid{grid-template-columns:1fr}
  .compare-hint{display:block}
  .data-num{font-size:34px}
  .data-suffix{font-size:18px}
  .update-card{padding:30px 24px}
  .download-title{font-size:30px}
  .download-meta{font-size:12.5px;white-space:nowrap}
  .download-btns{flex-direction:column;align-items:stretch}
  .download-btns .btn{width:100%}
  .chat-field{font-size:16px}
  .faq-q{padding:17px 18px;font-size:15px}
  .faq-a-inner{padding:0 18px 18px}
  .back-top{right:16px;bottom:16px;width:44px;height:44px}
}

@media (max-width:640px){
  .features-grid{grid-template-columns:1fr}
  .reviews-grid{grid-template-columns:1fr}
  .privacy-grid{grid-template-columns:1fr}
  .chat-body{height:300px}
  .persona-pick-grid{gap:12px}
  .persona-item img{width:58px;height:58px}
  .data-item{padding:26px 14px}
  .download-btns .btn{font-size:15px;padding:14px 20px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}