: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:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

.container{max-width:1160px;margin:0 auto;padding:0 24px}
.sec-title{font-size:30px;font-weight:800;color:var(--deep);text-align:center;line-height:1.4;margin-bottom:42px}
.ver{display:inline-block;padding:3px 14px;border-radius:999px;background:var(--primary-soft);color:var(--primary-deep);font-size:.62em;font-weight:800;vertical-align:middle;margin-left:8px;white-space:nowrap}

.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:6px;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-radius:999px;font-weight:700;font-size:16px;min-height:44px;padding:0 30px;transition:transform .25s,box-shadow .25s;box-shadow:0 8px 20px rgba(240,61,116,.22)}
.btn:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(240,61,116,.32)}
.btn-lg{font-size:17px;min-height:52px;padding:0 36px}
.btn-ghost{background:#fff;color:var(--primary-deep);border:2px solid var(--primary);box-shadow:0 8px 20px rgba(240,61,116,.12)}
.btn-ghost:hover{background:var(--primary-soft);box-shadow:0 14px 30px rgba(240,61,116,.22)}

.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,249,251,.92);backdrop-filter:blur(10px);transition:box-shadow .25s}
.nav.scrolled{box-shadow:0 4px 18px rgba(42,26,61,.08)}
.nav-inner{display:flex;align-items:center;gap:28px;height:64px}
.nav-logo{font-size:24px;font-weight:900;color:var(--deep);letter-spacing:.5px;display:inline-flex;align-items:center;padding:8px 0}
.nav-logo::before{content:"";width:22px;height:22px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));margin-right:8px;box-shadow:inset -4px -4px 6px rgba(255,255,255,.25)}
.nav-menu{display:flex;gap:26px;margin-left:8px}
.nav-menu a{font-size:15px;color:var(--text);font-weight:600;padding:6px 0;transition:color .2s}
.nav-menu a:hover{color:var(--primary-deep)}
.nav-btn{font-size:13px;min-height:36px;padding:0 18px;margin-left:auto}

.hero{padding:150px 0 90px;background:linear-gradient(180deg,var(--bg-soft),var(--bg))}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero-title{font-size:42px;font-weight:900;color:var(--deep);line-height:1.3;margin-bottom:20px}
.hero-desc{font-size:17px;color:var(--text);margin-bottom:28px;max-width:520px}
.personas{margin-bottom:30px}
.personas-tip{font-size:15px;font-weight:700;color:var(--muted);margin-bottom:14px}
.persona-list{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.persona{display:flex;flex-direction:column;align-items:center;gap:8px}
.persona img{width:84px;height:84px;border-radius:50%;object-fit:cover;border:3px solid #fff;box-shadow:0 6px 16px rgba(240,61,116,.15);transition:transform .25s}
.persona img:hover{transform:translateY(-4px) scale(1.04)}
.persona span{font-size:14px;font-weight:700;color:var(--text);white-space:nowrap}
.hero-cta{width:min(300px,100%)}

.chat{max-width:400px;width:100%;margin-left:auto;background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:0 16px 44px rgba(240,61,116,.14);overflow:hidden}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:linear-gradient(135deg,var(--primary),var(--primary-deep))}
.chat-avatar{width:46px;height:46px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.7)}
.chat-id{display:flex;flex-direction:column;line-height:1.35}
.chat-name{color:#fff;font-size:16px;font-weight:800}
.chat-status{color:rgba(255,255,255,.92);font-size:13px;display:inline-flex;align-items:center;gap:5px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(46,197,126,.3)}
.chat-body{height:400px;overflow-y:auto;padding:18px;background:var(--bg);display:flex;flex-direction:column;gap:12px}
.msg{max-width:82%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.6;animation:pop .3s ease}
@keyframes pop{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg.ai{align-self:flex-start;background:var(--card);border:1px solid var(--border);border-bottom-left-radius:4px;color:var(--text)}
.msg.user{align-self:flex-end;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:4px}
.chat-foot{display:flex;align-items:center;gap:10px;padding:12px 14px;border-top:1px solid var(--border);background:var(--card)}
.chat-input{flex:1;background:var(--bg-soft);border:1px solid var(--border);border-radius:999px;padding:12px 16px;font-size:14px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-send{flex:none;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 6px 14px rgba(240,61,116,.28);transition:opacity .3s,transform .2s}
.chat-send:hover{transform:scale(1.06)}
.chat-send.disabled{opacity:.4;box-shadow:none;pointer-events:none}

.steps{padding:90px 0}
.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{padding:36px 30px;text-align:center}
.step-num{display:inline-block;width:52px;height:52px;line-height:52px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);font-size:18px;font-weight:900;margin-bottom:18px}
.step h3{font-size:20px;font-weight:800;color:var(--deep);margin-bottom:10px}
.step p{color:var(--muted);font-size:15px}

.intro{padding:90px 0;background:var(--bg-soft)}
.intro-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:60px;align-items:center}
.intro-img{width:100%;max-width:520px;border-radius:24px;box-shadow:var(--shadow-hover)}
.intro-text .sec-title{text-align:left;margin-bottom:18px}
.intro-copy{color:var(--text);font-size:16px;margin-bottom:26px}
.checks{display:flex;flex-direction:column;gap:14px}
.checks li{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:600;color:var(--deep)}
.checks svg{width:22px;height:22px;color:var(--green);flex:none}

.features{padding:90px 0}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature{padding:30px 24px}
.feat-icon{display:inline-flex;width:56px;height:56px;border-radius:16px;background:var(--primary-soft);color:var(--primary-deep);align-items:center;justify-content:center;margin-bottom:18px}
.feat-icon svg{width:28px;height:28px}
.feature h3{font-size:19px;font-weight:800;color:var(--deep);margin-bottom:10px}
.pain{font-size:14px;color:var(--primary-deep);font-weight:600;background:var(--primary-soft);border-radius:10px;padding:7px 11px;margin-bottom:12px;line-height:1.5}
.feat-desc{font-size:14.5px;color:var(--muted)}

.compare{padding:90px 0;background:var(--bg-soft)}
.table-wrap{overflow-x:auto;border-radius:var(--radius);background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow)}
.cmp-table{width:100%;min-width:640px;border-collapse:collapse;table-layout:fixed;font-size:14.5px}
.cmp-table th{padding:16px 14px;font-size:15px;font-weight:800;color:var(--deep);background:var(--primary-soft);text-align:left}
.cmp-table th:first-child{background:var(--card)}
.cmp-table td{padding:14px;border-top:1px solid var(--border);color:var(--text);vertical-align:middle}
.cmp-table td:first-child{font-weight:700;color:var(--deep)}
.cmp-table .good{color:var(--primary-deep);font-weight:800;background:linear-gradient(90deg,var(--bg-soft),var(--card))}
.swipe-hint{display:none;text-align:center;font-size:13px;color:var(--muted);margin-top:12px}

.scenes{padding:90px 0}
.scene-checks{display:grid;grid-template-columns:repeat(2,1fr);gap:14px 32px;max-width:880px;margin:0 auto 54px}
.scene-checks li{position:relative;padding-left:32px;font-size:16px;font-weight:600;color:var(--text);line-height:1.6}
.scene-checks li::before{content:"";position:absolute;left:0;top:5px;width:20px;height:20px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));box-shadow:inset 0 -3px 5px rgba(255,255,255,.3)}
.scene-checks li::after{content:"";position:absolute;left:6px;top:11px;width:8px;height:4px;border-left:2px solid #fff;border-bottom:2px solid #fff;transform:rotate(-45deg)}
.vs-wrap{display:grid;grid-template-columns:1fr 1fr;gap:28px;max-width:880px;margin:0 auto;position:relative}
.vs-card{padding:32px 30px;text-align:center}
.vs-card h3{font-size:21px;font-weight:800;color:var(--deep);margin-bottom:16px}
.vs-card p{font-size:15px;color:var(--muted);padding:7px 0;border-top:1px dashed var(--border)}
.vs-card p:first-of-type{border-top:none}
.vs-win{border-color:var(--primary);box-shadow:0 12px 34px rgba(240,61,116,.12)}
.vs-win h3{color:var(--primary-deep)}
.vs-badge{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:16px;font-weight:900;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(240,61,116,.4);z-index:2;border:4px solid var(--bg)}

.stats{padding:90px 0;background:linear-gradient(135deg,var(--deep),#43255F)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;text-align:center}
.stat .num{display:block;font-size:44px;font-weight:900;color:#FFB3C7;line-height:1.2;margin-bottom:6px}
.stat:nth-child(odd) .num{color:var(--primary)}
.stat span{font-size:15px;color:rgba(255,255,255,.75)}

.custom{padding:90px 0;background:var(--bg-soft)}
.custom-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:60px;align-items:center}
.custom-img{width:100%;max-width:520px;border-radius:24px;box-shadow:var(--shadow-hover)}
.custom-text .sec-title{text-align:left;margin-bottom:18px}
.custom-text .btn{display:flex;width:fit-content;margin:0 auto}
.custom-copy{font-size:16px;color:var(--text);margin-bottom:30px;max-width:520px}

.reviews{padding:90px 0}
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.review{padding:26px 24px}
.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:800;display:inline-flex;align-items:center;justify-content:center;flex:none}
.review-meta{display:flex;flex-direction:column;line-height:1.3}
.review-meta b{font-size:15px;font-weight:800;color:var(--deep)}
.stars{color:#FFB800;font-size:13px;letter-spacing:1px}
.review p{font-size:14px;color:var(--muted)}

.privacy{padding:90px 0;background:var(--bg-soft)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy{padding:30px 24px;text-align:center}
.priv-icon{display:inline-flex;width:56px;height:56px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);align-items:center;justify-content:center;margin-bottom:16px}
.priv-icon svg{width:26px;height:26px}
.privacy h3{font-size:17px;font-weight:800;color:var(--deep);margin-bottom:8px}
.privacy p{font-size:14px;color:var(--muted)}

.updates{padding:90px 0}
.updates-card{max-width:820px;margin:0 auto;padding:44px 40px}
.updates-card .sec-title{margin-bottom:10px}
.update-time{text-align:center;font-size:15px;color:var(--muted);margin-bottom:24px}
.update-list{display:flex;flex-direction:column;gap:12px}
.update-list li{position:relative;padding-left:26px;font-size:15.5px;color:var(--text)}
.update-list li::before{content:"";position:absolute;left:0;top:8px;width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep))}

.faq{padding:90px 0;background:var(--bg-soft)}
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{overflow:hidden}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;text-align:left;padding:20px 24px;font-size:16px;font-weight:700;color:var(--deep);min-height:56px;transition:color .2s}
.faq-q:hover{color:var(--primary-deep)}
.faq-icon{flex:none;width:30px;height:30px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);font-size:18px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;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 p{padding:0 24px 22px;font-size:15px;color:var(--muted)}

.download{padding:100px 0;background:linear-gradient(180deg,var(--bg),var(--bg-soft));text-align:center}
.dl-title{font-size:38px;font-weight:900;color:var(--deep);margin-bottom:16px}
.dl-meta{font-size:15px;color:var(--muted);margin-bottom:34px;white-space:nowrap}
.dl-btns{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin-bottom:26px}
.dl-tip{font-size:15px;color:var(--muted)}

.footer{padding:34px 0;background:var(--deep);color:rgba(255,255,255,.7);font-size:14px}
.footer-inner{display:flex;align-items:center;justify-content:center;gap:6px;text-align:center}
.footer-brand{font-size:17px;font-weight:900;color:#fff;text-decoration:none}
.footer-brand:hover{color:var(--primary)}

.to-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 26px rgba(240,61,116,.4);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .3s,transform .3s,visibility .3s;z-index:99}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top svg{width:22px;height:22px}

@media (max-width:1100px){
  .hero-title{font-size:36px}
  .persona-list{grid-template-columns:repeat(3,1fr);row-gap:20px}
  .feature-grid,.privacy-grid,.stats-grid,.review-grid{grid-template-columns:repeat(2,1fr)}
  .sec-title{font-size:26px}
  .stat .num{font-size:36px}
}

@media (max-width:900px){
  .nav-menu{display:none}
  .hero{padding:130px 0 70px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-main{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .persona-list{max-width:480px;margin:0 auto}
  .hero-cta{margin-left:auto;margin-right:auto}
  .chat{margin:0 auto}
  .intro-grid,.custom-grid{grid-template-columns:1fr;gap:40px}
  .intro-text .sec-title,.custom-text .sec-title{text-align:center}
  .intro-img,.custom-img{margin:0 auto}
  .intro-copy,.custom-copy{margin-left:auto;margin-right:auto}
  .checks{align-items:flex-start;max-width:520px;margin:0 auto}
  .vs-wrap{grid-template-columns:1fr;gap:20px}
  .vs-badge{position:static;transform:none;margin:-10px auto}
  .step-grid{grid-template-columns:1fr;gap:18px}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .nav-inner{height:58px}
  .nav-btn{min-height:44px}
  .hero-cta{width:100%}
  html{scroll-padding-top:70px}
  .hero{padding:110px 0 60px}
  .hero-title{font-size:30px}
  .hero-desc{font-size:15.5px}
  .persona img{width:72px;height:72px}
  .steps,.intro,.features,.compare,.scenes,.reviews,.privacy,.updates,.faq,.custom{padding:64px 0}
  .stats{padding:64px 0}
  .sec-title{font-size:23px;margin-bottom:32px}
  .table-wrap{min-width:100%}
  .swipe-hint{display:block}
  .dl-meta{font-size:13px}
  .dl-btns{flex-direction:column;align-items:stretch;gap:14px}
  .dl-title{font-size:30px}
  .chat-body{height:340px}
  .to-top{right:20px;bottom:20px}
}

@media (max-width:640px){
  .feature-grid,.review-grid,.privacy-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:26px}
  .scene-checks{grid-template-columns:1fr}
  .chat-body{height:300px}
  .stat .num{font-size:32px}
  .updates-card{padding:32px 24px}
}