:root{
  --primary:#FF4D2E;
  --primary-deep:#E63B1E;
  --primary-bg:#FFF3F0;
  --dark:#1E222A;
  --text:#3D4451;
  --muted:#6E7686;
  --border:#EAECF0;
  --bg:#F7F8FA;
  --card:#FFFFFF;
  --radius:16px;
  --shadow:0 6px 24px rgba(30,34,42,.08);
  --shadow-hover:0 14px 32px rgba(30,34,42,.14);
  --nav-h:64px;
  --max-w:1160px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px);-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit}
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}

.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 4px 18px rgba(30,34,42,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.logo{font-size:22px;font-weight:800;color:var(--dark);letter-spacing:.5px;white-space:nowrap}
.logo b{color:var(--primary)}
.menu{display:flex;align-items:center;gap:2px}
.menu a{padding:8px 11px;font-size:14px;color:var(--text);border-radius:8px;transition:color .2s,background .2s}
.menu a:hover{color:var(--primary);background:var(--primary-bg)}
.menu a.active{color:var(--primary);font-weight:600}

.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;font-weight:600;transition:transform .2s,box-shadow .2s,background .2s;cursor:pointer;border:none;white-space:nowrap}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 18px rgba(255,77,46,.28)}
.btn-primary:hover{background:var(--primary-deep);transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,77,46,.35)}
.btn-outline{border:1.5px solid var(--primary);color:var(--primary);background:#fff}
.btn-outline:hover{background:var(--primary-bg);transform:translateY(-2px)}
.nav-btn{font-size:13px;padding:7px 16px}

.hero{background:linear-gradient(180deg,#FFF8F6 0%,var(--bg) 100%);padding:64px 0 84px;overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center}
.hero h1{font-size:46px;line-height:1.22;color:var(--dark);font-weight:800;margin-bottom:22px}
.ver{display:inline-block;font-size:19px;font-weight:700;color:var(--primary);background:var(--primary-bg);border:1px solid rgba(255,77,46,.28);padding:3px 12px;border-radius:999px;margin-left:12px;vertical-align:middle;line-height:1.4;white-space:nowrap}
.hero p{font-size:17px;color:var(--muted);max-width:520px;margin-bottom:34px}
.hero-btns{display:flex;gap:16px}
.hero-btns .btn{font-size:16px;padding:13px 30px}
.hero-img{position:relative;display:flex;justify-content:center}
.hero-img::before{content:"";position:absolute;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(255,77,46,.16),transparent 70%);top:6%;left:50%;transform:translateX(-50%);z-index:0}
.hero-img img{position:relative;width:100%;max-width:330px;border-radius:24px;box-shadow:0 20px 48px rgba(30,34,42,.18);z-index:1}

.section{padding:84px 0}
.sec-title{font-size:32px;font-weight:800;color:var(--dark);text-align:center;margin-bottom:12px}
.sec-sub{text-align:center;color:var(--muted);max-width:640px;margin:0 auto 48px;font-size:15px}

.preview-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.preview-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.preview-item:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.preview-item img{width:100%}

.intro-wrap{max-width:860px;margin:0 auto}
.intro-wrap>p{font-size:16px;margin-bottom:18px;color:var(--text)}
.intro-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.intro-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px 24px;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.intro-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.intro-card h3{font-size:18px;color:var(--dark);margin-bottom:8px}
.intro-card p{font-size:14px;color:var(--muted)}

.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feat-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:30px 26px;transition:transform .25s,box-shadow .25s}
.feat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.feat-icon{width:52px;height:52px;border-radius:14px;background:var(--primary-bg);color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feat-icon svg{width:26px;height:26px}
.feat-card h3{font-size:18px;color:var(--dark);margin-bottom:8px}
.feat-card p{font-size:14px;color:var(--muted)}

.cmp-wrap{max-width:880px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.cmp-table{width:100%;border-collapse:collapse;text-align:center;font-size:15px}
.cmp-table th,.cmp-table td{padding:14px 18px;border-bottom:1px solid var(--border)}
.cmp-table thead th{background:var(--dark);color:#fff;font-weight:600}
.cmp-table thead th:nth-child(2){background:var(--primary)}
.cmp-table tbody tr:last-child td{border-bottom:none}
.cmp-table td:first-child{color:var(--muted);font-weight:500;text-align:left;width:26%}
.cmp-table td:nth-child(2){background:var(--primary-bg);color:var(--primary-deep);font-weight:600}
.cmp-table tbody tr{transition:background .2s}
.cmp-table tbody tr:hover td{background:var(--bg)}
.cmp-table tbody tr:hover td:nth-child(2){background:#FFEAE3}

.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.data-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:34px 20px;text-align:center;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.data-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.data-num{font-size:38px;font-weight:800;color:var(--primary);line-height:1.2}
.data-label{font-size:16px;font-weight:600;color:var(--dark);margin-top:10px}
.data-desc{font-size:13px;color:var(--muted);margin-top:4px}

.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);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}
.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#FF8A5C);color:#fff;font-size:18px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-card:nth-child(2) .avatar{background:linear-gradient(135deg,#FF8A5C,#FFB25C)}
.review-card:nth-child(3) .avatar{background:linear-gradient(135deg,#E63B1E,#FF4D2E)}
.review-card:nth-child(4) .avatar{background:linear-gradient(135deg,#FF6B4A,#FF8A5C)}
.review-card:nth-child(5) .avatar{background:linear-gradient(135deg,#FF4D2E,#FFB25C)}
.review-card:nth-child(6) .avatar{background:linear-gradient(135deg,#FF8A5C,#E63B1E)}
.review-user{font-weight:700;color:var(--dark);font-size:15px}
.stars{color:#F5A623;font-size:14px;letter-spacing:2px;margin-top:2px}
.review-card>p{font-size:14px;color:var(--text);line-height:1.8}

.ver-card{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.ver-head{background:linear-gradient(135deg,var(--primary),#FF8A5C);color:#fff;padding:28px 34px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}
.ver-num{font-size:26px;font-weight:800}
.ver-date{font-size:14px;opacity:.94}
.ver-list{padding:28px 34px}
.ver-list li{position:relative;padding-left:24px;font-size:15px;color:var(--text);line-height:2}
.ver-list li::before{content:"";position:absolute;left:2px;top:13px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

.faq-wrap{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:14px;overflow:hidden;transition:box-shadow .25s}
.faq-item.open{box-shadow:var(--shadow)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;background:none;border:none;cursor:pointer;font-size:16px;font-weight:600;color:var(--dark);text-align:left}
.faq-q:hover{color:var(--primary)}
.faq-icon{width:24px;height:24px;border-radius:50%;background:var(--primary-bg);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:18px;line-height:1;flex-shrink:0;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 22px 20px;font-size:14.5px;color:var(--muted)}

.download{background:linear-gradient(160deg,#1E222A 0%,#2A2F3A 100%);color:#fff;padding:84px 0;text-align:center}
.download h1{font-size:38px;font-weight:800;margin-bottom:8px}
.download .ver{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.3);color:#FFD9CF}
.dl-meta{font-size:14px;color:#B7BECB;margin:26px 0 32px;display:flex;justify-content:center;gap:28px;white-space:nowrap}
.dl-btns{display:flex;justify-content:center;gap:18px}
.dl-btn{font-size:17px;padding:14px 38px;box-shadow:0 8px 22px rgba(0,0,0,.25)}
.dl-btn-android{background:var(--primary);color:#fff}
.dl-btn-android:hover{background:var(--primary-deep);transform:translateY(-2px)}
.dl-btn-ios{background:#fff;color:var(--dark)}
.dl-btn-ios:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(0,0,0,.3)}
.dl-tip{margin-top:26px;font-size:14px;color:#B7BECB}

.footer{background:var(--dark);color:#9AA3B2;padding:28px 0;text-align:center;font-size:14px}
.footer a{color:#fff;font-weight:600;transition:color .2s}
.footer a:hover{color:var(--primary)}

.to-top{position:fixed;right:26px;bottom:26px;width:46px;height:46px;border-radius:50%;background:var(--primary);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(255,77,46,.35);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,visibility .3s,transform .3s;z-index:90}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--primary-deep)}

@media (max-width:1024px){
  .hero h1{font-size:38px}
  .menu a{padding:8px 8px;font-size:13px}
  .preview-grid,.feat-grid,.review-grid{grid-template-columns:repeat(2,1fr)}
  .data-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .section,.download{padding:56px 0}
  .menu{display:none}
  .logo{padding:8px 0}
  .nav-btn{padding:10px 18px}
  .hero{padding:44px 0 56px}
  .hero-inner{grid-template-columns:1fr;gap:36px;text-align:center}
  .hero h1{font-size:31px}
  .hero .ver{font-size:15px;margin-left:8px}
  .hero p{font-size:15px;margin-left:auto;margin-right:auto}
  .hero-btns{flex-direction:column;gap:14px;max-width:360px;margin:0 auto}
  .hero-btns .btn{width:100%;padding:13px 16px}
  .hero-img img{margin:0 auto;max-width:300px}
  .sec-title{font-size:26px}
  .sec-sub{margin-bottom:34px}
  .preview-grid{grid-template-columns:1fr;gap:18px}
  .intro-cards{grid-template-columns:1fr;gap:14px;margin-top:30px}
  .feat-grid{grid-template-columns:1fr;gap:14px}
  .review-grid{grid-template-columns:1fr;gap:14px}
  .data-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .data-card{padding:24px 14px}
  .data-num{font-size:28px}
  .cmp-table{font-size:12px}
  .cmp-table th,.cmp-table td{padding:10px 6px}
  .cmp-table thead th{font-size:12.5px}
  .ver-head{padding:22px 20px}
  .ver-num{font-size:22px}
  .ver-list{padding:22px 20px}
  .ver-list li{font-size:14px;padding-left:20px}
  .ver-list li::before{top:12px}
  .faq-q{font-size:15px;padding:16px 18px}
  .faq-a p{padding:0 18px 18px;font-size:14px}
  .download h1{font-size:29px}
  .download h1 .ver{font-size:14px;margin-left:8px}
  .dl-meta{font-size:12px;gap:14px;margin:20px 0 26px}
  .dl-btns{flex-direction:column;align-items:center;gap:14px}
  .dl-btn{width:100%;max-width:360px;padding:13px 16px;font-size:16px}
  .dl-tip{font-size:13px}
  .to-top{right:16px;bottom:16px;width:42px;height:42px}
}