: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;
  --gold:#FFB800;
  --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) + 12px)}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",sans-serif;color:var(--text);background:var(--bg);font-size:15px;line-height:1.7;padding-top:var(--nav-h);-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%}
ul{list-style:none}
button{font-family:inherit}
::selection{background:var(--primary-soft)}

.container{max-width:1140px;margin:0 auto;padding:0 24px}
section{padding:84px 0}

.sec-title{font-size:34px;font-weight:800;color:var(--deep);text-align:center;line-height:1.35;margin-bottom:12px}
.sec-sub{text-align:center;color:var(--muted);font-size:16px;margin-bottom:44px}
.sec-title.light{color:#fff}

.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;min-height:44px;padding:10px 26px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-weight:600;font-size:15px;border:none;cursor:pointer;transition:transform .25s,box-shadow .25s;white-space:nowrap}
.btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.btn-lg{padding:15px 38px;font-size:17px}

.icon{width:44px;height:44px;color:var(--primary)}

.check{position:relative;flex:none;width:20px;height:20px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep))}
.check::after{content:"";position:absolute;left:6px;top:3px;width:5px;height:9px;border-right:2px solid #fff;border-bottom:2px solid #fff;transform:rotate(45deg)}

.nav{position:fixed;top:0;left:0;right:0;height:var(--nav-h);background:rgba(255,255,255,.9);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);z-index:100;transition:box-shadow .25s}
.nav.scrolled{box-shadow:0 6px 20px rgba(42,26,61,.08)}
.nav-inner{height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{font-size:21px;font-weight:800;color:var(--deep);letter-spacing:.5px;display:inline-flex;align-items:center;gap:8px;min-height:44px}
.logo::before{content:"";width:14px;height:14px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));flex:none}
.nav-menu{display:flex;align-items:center;gap:6px}
.nav-menu a{padding:8px 16px;font-size:15px;color:var(--text);font-weight:500;border-radius:999px;transition:color .2s,background .2s}
.nav-menu a:hover{color:var(--primary-deep);background:var(--primary-soft)}
.nav-btn{padding:8px 18px;min-height:44px;font-size:14.5px}

.hero{background:linear-gradient(180deg,var(--bg) 0%,var(--bg-soft) 100%);padding:72px 0 88px}
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:52px;align-items:center}
.hero h1{font-size:44px;font-weight:800;color:var(--deep);line-height:1.3;margin-bottom:18px}
.ver{display:inline-block;vertical-align:middle;margin-left:10px;padding:4px 14px;background:var(--primary-soft);color:var(--primary-deep);font-size:.5em;font-weight:700;border-radius:999px;letter-spacing:.5px}
.hero-desc{font-size:17px;line-height:1.85;color:var(--muted);max-width:540px;margin-bottom:28px}
.hero-btn{margin-bottom:40px}
.personas-title{font-size:15px;font-weight:700;color:var(--deep);margin-bottom:16px}
.persona-list{display:grid;grid-template-columns:repeat(6,1fr);gap:16px;max-width:600px}
.persona{display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px 6px;border-radius:14px;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.persona:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.persona img{width:72px;height:72px;border-radius:50%;object-fit:cover;border:2px solid var(--primary-soft)}
.persona span{font-size:13.5px;font-weight:600;color:var(--text)}

.chat-card{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:0 20px 50px rgba(240,61,116,.16);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;border-bottom:1px solid var(--border);background:#fff}
.chat-ava{width:44px;height:44px;border-radius:50%;object-fit:cover;border:2px solid var(--primary-soft)}
.chat-head-info{flex:1;min-width:0}
.chat-name{font-size:15.5px;font-weight:700;color:var(--deep)}
.chat-status{font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:5px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.18);flex:none}
.chat-body{height:300px;overflow-y:auto;padding:18px;background:var(--bg);display:flex;flex-direction:column;gap:14px}
.chat-body::-webkit-scrollbar{width:6px}
.chat-body::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
.msg{display:flex;gap:10px;align-items:flex-end}
.msg.user{justify-content:flex-end}
.msg-ava{width:32px;height:32px;border-radius:50%;object-fit:cover;flex:none}
.bubble{max-width:78%;padding:11px 15px;font-size:14px;line-height:1.65;border-radius:16px}
.msg.ai .bubble{background:#fff;border:1px solid var(--border);border-top-left-radius:5px;color:var(--text)}
.msg.user .bubble{background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;border-top-right-radius:5px}
.chat-input{display:flex;gap:10px;padding:12px 14px;border-top:1px solid var(--border);background:#fff}
.chat-input input{flex:1;min-width:0;border:1px solid var(--border);border-radius:999px;padding:0 18px;height:44px;font-size:14px;color:var(--muted);background:var(--bg);outline:none}
.send-btn{flex:none;min-height:44px;padding:0 22px;border:none;border-radius:999px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-size:14.5px;font-weight:600;cursor:pointer;transition:transform .2s}
.send-btn:hover{transform:translateY(-2px)}
.send-btn.off{background:#E8DCE6;color:#B9A8C4;cursor:not-allowed;transform:none}

.steps{background:var(--bg)}
.step-list{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{padding:34px 28px;position:relative}
.step-num{position:absolute;top:22px;right:24px;font-size:15px;font-weight:800;color:var(--primary);opacity:.45}
.step .icon{margin-bottom:16px}
.step h3{font-size:19px;font-weight:700;color:var(--deep);margin-bottom:10px}
.step p{color:var(--muted);font-size:14.5px;line-height:1.7}

.product{background:var(--bg-soft)}
.product-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:60px;align-items:center}
.product-img{width:100%;max-width:520px;border-radius:24px;box-shadow:var(--shadow);justify-self:center}
.product-text .sec-title{text-align:left}
.product-desc{color:var(--muted);font-size:16px;line-height:1.9;margin:16px 0 24px}
.check-list li{display:flex;align-items:center;gap:12px;padding:9px 0;font-size:15.5px;color:var(--text);font-weight:500}

.features{background:var(--bg)}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature{padding:30px 26px;display:flex;flex-direction:column;gap:12px}
.feature .icon{width:46px;height:46px;padding:11px;border-radius:14px;background:var(--primary-soft);color:var(--primary-deep)}
.feature h3{font-size:18.5px;font-weight:700;color:var(--deep)}
.pain{display:inline-block;align-self:flex-start;padding:4px 12px;border-radius:999px;background:var(--primary-soft);color:var(--primary-deep);font-size:13px;font-weight:600}
.feature .desc{color:var(--muted);font-size:14px;line-height:1.75;flex:1}

.compare{background:var(--bg-soft)}
.compare-wrap{border-radius:var(--radius);background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden}
.compare-table{width:100%;border-collapse:collapse;table-layout:fixed}
.compare-table th,.compare-table td{padding:15px 14px;text-align:center;font-size:14.5px;border-bottom:1px solid var(--border)}
.compare-table thead th{background:var(--deep);color:#fff;font-weight:600;font-size:15px}
.compare-table thead th:first-child{width:16%}
.compare-table tbody tr:last-child td{border-bottom:none}
.compare-table tbody td:first-child{font-weight:600;color:var(--deep);background:var(--bg)}
.compare-table tbody tr:hover td{background:var(--bg-soft)}
.col-brand{color:var(--primary-deep);font-weight:600;background:var(--primary-soft)}
.slide-hint{display:none;text-align:center;color:var(--muted);font-size:12px;margin-top:12px}

.scenes{background:var(--bg)}
.scene-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px 30px;max-width:940px;margin:0 auto 56px}
.scene-list li{display:flex;align-items:center;gap:12px;padding:16px 20px;background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);font-size:15px;font-weight:500;color:var(--text);transition:transform .25s,box-shadow .25s}
.scene-list li:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.vs-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.vs-card{padding:30px 28px}
.vs-card h3{font-size:20px;font-weight:800;margin-bottom:18px}
.vs-bad h3{color:#C25B6B}
.vs-good h3{color:var(--primary-deep)}
.vs-card ul li{position:relative;padding:9px 0 9px 26px;font-size:15px;color:var(--text)}
.vs-card ul li::before{content:"";position:absolute;left:2px;top:16px;width:9px;height:9px;border-radius:50%}
.vs-bad ul li::before{background:#E8A0AB}
.vs-good ul li::before{background:var(--green)}

.data{background:var(--deep);padding:76px 0}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat{text-align:center;padding:26px 16px;border-radius:var(--radius);background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12)}
.num{font-size:46px;font-weight:800;color:#fff;background:linear-gradient(90deg,#FFB3CD,var(--primary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.3}
.label{color:rgba(255,255,255,.66);font-size:14.5px;margin-top:6px}

.custom{background:var(--bg-soft)}
.custom-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.custom-img{width:100%;max-width:520px;border-radius:24px;box-shadow:var(--shadow);justify-self:center}
.custom-text .sec-title{text-align:left}
.custom-desc{color:var(--muted);font-size:16px;line-height:1.9;margin:14px 0 22px}
.custom-text .check-list{margin-bottom:30px}

.reviews{background:var(--bg)}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review{padding:28px 26px;display:flex;flex-direction:column}
.ava{width:50px;height:50px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.name{font-size:15.5px;font-weight:700;color:var(--deep)}
.stars{color:var(--gold);font-size:14px;letter-spacing:3px;margin:4px 0 12px}
.review .text{color:var(--muted);font-size:14.5px;line-height:1.8}

.privacy{background:var(--bg-soft)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy-card{padding:30px 26px;display:flex;flex-direction:column;gap:12px}
.privacy-card .icon{width:46px;height:46px;padding:11px;border-radius:14px;background:var(--primary-soft);color:var(--primary-deep)}
.privacy-card h3{font-size:18px;font-weight:700;color:var(--deep)}
.privacy-card p{color:var(--muted);font-size:14px;line-height:1.75}

.updates{background:var(--bg)}
.update-card{max-width:860px;margin:0 auto;padding:34px 34px 22px}
.update-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:20px;border-bottom:1px dashed var(--border);margin-bottom:14px}
.update-ver{font-size:32px;font-weight:800;color:var(--primary-deep);line-height:1.3}
.update-date{color:var(--muted);font-size:14px;margin-top:4px}
.badge{flex:none;padding:6px 16px;border-radius:999px;background:var(--primary-soft);color:var(--primary-deep);font-size:13.5px;font-weight:700}
.update-log li{position:relative;padding:11px 0 11px 26px;font-size:15px;color:var(--text);border-bottom:1px dashed var(--border)}
.update-log li:last-child{border-bottom:none}
.update-log li::before{content:"";position:absolute;left:4px;top:20px;width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep))}

.faq{background:var(--bg-soft)}
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);margin-bottom:14px;overflow:hidden;transition:box-shadow .25s}
.faq-item:hover{box-shadow:var(--shadow-hover)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:19px 22px;background:none;border:none;font-size:16px;font-weight:600;color:var(--deep);cursor:pointer;text-align:left}
.faq-q:focus-visible{outline:2px solid var(--primary);outline-offset:-2px}
.arrow{flex:none;width:10px;height:10px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .3s}
.faq-item.open .arrow{transform:rotate(-135deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a p{padding:0 22px 20px;color:var(--muted);font-size:14.5px;line-height:1.8}

.download{background:linear-gradient(180deg,var(--bg-soft),var(--bg));text-align:center}
.dl-title{font-size:40px;font-weight:800;color:var(--deep);line-height:1.35}
.dl-meta{color:var(--muted);font-size:14.5px;margin-top:14px}
.dl-btns{display:flex;justify-content:center;gap:20px;margin-top:28px;flex-wrap:wrap}
.dl-btn{min-width:250px}
.dl-tip{color:var(--muted);font-size:14.5px;margin-top:20px}

.footer{background:var(--deep);color:rgba(255,255,255,.72);text-align:center;padding:26px 20px;font-size:14px}
.footer a{color:#FFB3CD;font-weight:600}

.to-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;font-size:20px;cursor:pointer;box-shadow:var(--shadow-hover);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:translateY(0)}
.to-top:hover{transform:translateY(-3px)}

@media (max-width:1100px){
  .hero h1{font-size:36px}
  .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)}
  .sec-title{font-size:29px}
  .hero-grid{gap:40px}
}

@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding:56px 0 68px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-left{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .persona-list{margin-left:auto;margin-right:auto}
  .chat-card{max-width:460px;margin:0 auto}
  .product-grid{grid-template-columns:1fr;gap:36px}
  .product-text .sec-title{text-align:center}
  .product-img{margin:0 auto}
  .product-desc{text-align:center}
  .check-list li{justify-content:center}
  .custom-grid{grid-template-columns:1fr;gap:36px}
  .custom-text{text-align:center}
  .custom-text .sec-title{text-align:center}
  .custom-desc{text-align:center}
  .vs-grid{grid-template-columns:1fr}
  .scene-list{grid-template-columns:1fr}
}

@media (max-width:768px){
  .container{padding:0 20px}
  section{padding:64px 0}
  .hero{padding:48px 0 60px}
  .hero h1{font-size:31px}
  .hero-desc{font-size:15.5px}
  .hero-btn{width:100%;max-width:340px}
  .compare-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .compare-table{min-width:640px}
  .slide-hint{display:block}
  .dl-title{font-size:30px}
  .dl-meta{font-size:12px;white-space:nowrap}
  .dl-btns{flex-direction:column;align-items:stretch;gap:14px}
  .dl-btn{width:100%;min-width:0}
  .nav-btn{padding:8px 14px;font-size:13.5px}
}

@media (max-width:640px){
  .chat-input input{font-size:16px}
  .step-list{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .privacy-grid{grid-template-columns:1fr}
  .stat-grid{gap:16px}
  .num{font-size:34px}
  .chat-body{height:240px}
  .persona img{width:64px;height:64px}
  .sec-title{font-size:26px}
  .sec-sub{margin-bottom:32px}
  .dl-tip{font-size:13.5px}
}