: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:72px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 32px}

.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-weight:600;text-decoration:none;border:none;cursor:pointer;transition:transform .25s,box-shadow .25s;box-shadow:var(--shadow)}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn:active{transform:translateY(0)}
.btn-lg{padding:16px 44px;font-size:17px}
.btn-sm{padding:8px 20px;font-size:14px}

.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)}

.sec-title{font-size:32px;color:var(--deep);text-align:center;margin-bottom:10px}
.sec-sub{text-align:center;color:var(--muted);margin-bottom:40px;font-size:16px}
.ver{color:var(--primary);font-size:.55em;font-weight:700;vertical-align:middle}

/* 导航 */
.navbar{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);transition:box-shadow .3s}
.navbar.scrolled{box-shadow:0 4px 20px rgba(240,61,116,.12)}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 32px;height:64px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.nav-logo{display:flex;align-items:center;gap:8px;text-decoration:none;font-size:22px;font-weight:800;color:var(--deep);min-height:44px}
.nav-logo svg{width:26px;height:26px;color:var(--primary)}
.nav-menu{display:flex;gap:28px}
.nav-menu a{text-decoration:none;font-size:15px;color:var(--text);font-weight:500;transition:color .2s}
.nav-menu a:hover{color:var(--primary)}
.nav-download{min-height:44px}

/* Hero */
.hero{background:linear-gradient(180deg,#fff 0%,var(--bg-soft) 55%,var(--bg) 100%);padding:120px 0 64px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-text h1{font-size:46px;color:var(--deep);line-height:1.25;margin-bottom:18px}
.hero-desc{font-size:17px;color:var(--text);margin-bottom:28px;max-width:520px}
.hero-btn{margin-bottom:26px}
.hero-points{display:flex;gap:14px;flex-wrap:wrap}
.hero-points span{background:var(--primary-soft);color:var(--primary-deep);font-size:14px;font-weight:600;padding:6px 14px;border-radius:999px}

.chat-card{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow-hover);overflow:hidden;width:100%;max-width:400px;margin:0 auto}
.chat-head{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid var(--border);background:#fff}
.chat-avatar{width:46px;height:46px;border-radius:50%;object-fit:cover;border:2px solid var(--primary-soft)}
.chat-id strong{display:block;font-size:16px;color:var(--deep)}
.chat-status{display:inline-flex;align-items:center;gap:5px;font-size:14px;color:var(--muted)}
.chat-status i{width:8px;height:8px;border-radius:50%;background:var(--green);display:inline-block}
.chat-body{height:260px;overflow-y:auto;padding:16px;background:var(--bg);display:flex;flex-direction:column;gap:10px}
.msg{display:flex}
.msg-me{justify-content:flex-end}
.bubble{max-width:78%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.55;word-break:break-word}
.msg-ai .bubble{background:var(--primary-soft);color:var(--deep);border-bottom-left-radius:4px}
.msg-me .bubble{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;border-bottom-right-radius:4px}
.chat-input{display:flex;align-items:center;gap:10px;padding:12px 14px;border-top:1px solid var(--border);background:#fff}
.chat-input input{flex:1;height:42px;border:1px solid var(--border);border-radius:999px;padding:0 16px;font-size:14px;color:var(--muted);background:var(--bg);outline:none}
.send-btn{width:44px;height:44px;min-width:44px;border-radius:50%;border:none;background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background .3s,transform .2s}
.send-btn svg{width:18px;height:18px}
.send-btn:hover{transform:scale(1.05)}
.send-btn.is-off{background:#D9CBD6;cursor:default;transform:none}

.crowd-title{font-size:24px;color:var(--deep);text-align:center;margin:56px 0 28px}
.crowd-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:16px}
.crowd-item{text-align:center}
.crowd-item img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:16px;border:1px solid var(--border);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.crowd-item:hover img{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.crowd-item span{display:block;margin-top:8px;font-size:14px;font-weight:600;color:var(--deep)}

/* 三步 */
.steps{padding:72px 0;background:var(--bg)}
.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step-card{padding:32px 28px;text-align:center}
.step-num{width:56px;height:56px;margin:0 auto 18px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center}
.step-card h3{font-size:20px;color:var(--deep);margin-bottom:10px}
.step-card p{font-size:15px;color:var(--muted)}

/* 产品介绍 */
.intro{padding:72px 0;background:var(--bg-soft)}
.intro-text{font-size:17px;color:var(--text);text-align:center;max-width:820px;margin:0 auto 32px;line-height:1.9}
.check-list{list-style:none;max-width:680px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.check-list li{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px 20px;font-size:15px;font-weight:500;color:var(--deep);box-shadow:var(--shadow)}
.check-list li::before{content:"✓";width:22px;height:22px;flex-shrink:0;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:13px;font-weight:800;display:flex;align-items:center;justify-content:center}

/* 核心功能 */
.features{padding:72px 0;background:var(--bg)}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{padding:30px 24px;text-align:center}
.feature-icon{width:64px;height:64px;margin:0 auto 18px;border-radius:18px;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center}
.feature-icon svg{width:32px;height:32px}
.feature-card h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.feature-card p{font-size:14.5px;color:var(--muted)}

/* 优势对比 */
.compare{padding:72px 0;background:var(--bg-soft)}
.table-wrap{overflow-x:auto;border-radius:var(--radius)}
.compare-table{width:100%;border-collapse:collapse;background:var(--card);box-shadow:var(--shadow);border-radius:var(--radius);overflow:hidden;min-width:640px}
.compare-table th,.compare-table td{padding:16px 20px;text-align:left;font-size:15px;border-bottom:1px solid var(--border)}
.compare-table thead th{background:var(--deep);color:#fff;font-size:16px;font-weight:600}
.compare-table thead th.col-brand{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff}
.compare-table tbody tr:last-child td{border-bottom:none}
.compare-table td:first-child{font-weight:600;color:var(--deep);background:var(--bg)}
.compare-table .col-brand{background:var(--primary-soft);color:var(--primary-deep);font-weight:600}
.table-hint{display:none;text-align:center;color:var(--muted);font-size:14px;margin-top:14px}

/* 数据 */
.stats{padding:72px 0;background:var(--deep)}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-num{font-size:46px;font-weight:800;color:#fff;line-height:1.2}
.stat-num .count{color:var(--primary)}
.stat-item p{margin-top:8px;color:#C9BBD8;font-size:15px}

/* 评价 */
.reviews{padding:72px 0;background:var(--bg)}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{padding:26px 24px}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;font-size:18px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-id strong{display:block;font-size:16px;color:var(--deep)}
.stars{color:#FFB800;font-size:14px;letter-spacing:2px}
.review-card p{font-size:14.5px;color:var(--text)}

/* 隐私 */
.privacy{padding:72px 0;background:var(--bg-soft)}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.privacy-card{padding:30px 24px;text-align:center}
.privacy-card h3{font-size:19px;color:var(--deep);margin-bottom:10px}
.privacy-card p{font-size:14.5px;color:var(--muted)}

/* 版本 */
.version{padding:72px 0;background:var(--bg)}
.version-card{max-width:720px;margin:0 auto;padding:32px 36px}
.version-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:22px}
.ver-badge{background:linear-gradient(90deg,var(--primary),var(--primary-deep));color:#fff;font-weight:800;font-size:17px;padding:8px 22px;border-radius:999px}
.ver-date{color:var(--muted);font-size:15px}
.changelog{list-style:none;display:flex;flex-direction:column;gap:12px}
.changelog li{display:flex;align-items:flex-start;gap:12px;font-size:15px;color:var(--text)}
.changelog li::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--primary);margin-top:8px;flex-shrink:0}

/* FAQ */
.faq{padding:72px 0;background:var(--bg-soft)}
.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.faq-item{overflow:hidden}
.faq-q{display:flex;justify-content:space-between;align-items:center;width:100%;background:none;border:none;padding:20px 24px;font-size:16px;font-weight:600;color:var(--deep);cursor:pointer;text-align:left;font-family:inherit}
.faq-arrow{width:10px;height:10px;border-right:2px solid var(--primary);border-bottom:2px solid var(--primary);transform:rotate(45deg);transition:transform .3s;flex-shrink:0;margin-left:16px}
.faq-item.open .faq-arrow{transform:rotate(-135deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:320px}
.faq-inner{padding:0 24px 20px;color:var(--text);font-size:15px;line-height:1.75}

/* 下载 */
.download{padding:80px 0;background:linear-gradient(160deg,var(--bg-soft) 0%,var(--bg) 100%);text-align:center}
.dl-title{font-size:38px;color:var(--deep);margin-bottom:16px}
.dl-meta{display:flex;justify-content:center;gap:28px;color:var(--muted);font-size:14px;margin-bottom:32px}
.dl-btns{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}
.dl-btn{padding:16px 36px;font-size:16px}
.dl-tip{margin-top:28px;color:var(--muted);font-size:15px}

/* 页脚 */
.footer{padding:36px 0;background:var(--deep);text-align:center}
.footer p{color:#C9BBD8;font-size:14px}
.footer-link{color:#fff;font-weight:700;text-decoration:none;transition:color .2s}
.footer-link:hover{color:var(--primary)}

/* 返回顶部 */
.to-top{position:fixed;right:28px;bottom:28px;width:48px;height:48px;border-radius:50%;border:none;background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;display:flex;align-items:center;justify-content:center;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 svg{width:20px;height:20px}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}

@media (max-width:1100px){
  .sec-title{font-size:28px}
  .hero-text h1{font-size:38px}
  .crowd-grid{grid-template-columns:repeat(2,1fr);gap:20px;max-width:480px;margin:0 auto}
  .feature-grid,.privacy-grid,.stat-grid,.review-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:900px){
  .nav-menu{display:none}
  .hero-grid{grid-template-columns:1fr;gap:40px;max-width:720px;margin:0 auto}
  .hero-text{text-align:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .hero-points{justify-content:center}
  .chat-card{max-width:420px}
  .crowd-title{margin-top:44px}
  .intro-text{font-size:16px}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .nav-inner{padding:0 20px}
  .table-hint{display:block}
  .dl-btns{flex-direction:column;align-items:stretch;max-width:420px;margin:0 auto}
  .dl-btn{width:100%}
  .dl-meta{gap:12px;font-size:12px;white-space:nowrap}
  .hero{padding:104px 0 48px}
}

@media (max-width:640px){
  .feature-grid,.review-grid,.privacy-grid{grid-template-columns:1fr}
  .chat-body{height:190px}
  .chat-input input{font-size:16px}
  .hero-text h1{font-size:32px}
  .dl-title{font-size:28px}
  .stat-num{font-size:34px}
  .step-grid{grid-template-columns:1fr}
  .step-card{padding:26px 22px}
  .sec-title{font-size:25px}
  .crowd-grid{gap:14px}
  .to-top{right:16px;bottom:16px;width:46px;height:46px}
}