:root{
  --primary:#2563eb;
  --primary-deep:#1e40af;
  --primary-soft:#eaf1ff;
  --accent:#ff7a1a;
  --dark:#0f1b2d;
  --dark-2:#17263d;
  --bg:#f5f7fb;
  --card:#ffffff;
  --border:#e4e9f2;
  --text:#1e293b;
  --text-sub:#64748b;
  --star:#f5a623;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 6px 20px rgba(15,27,45,.08);
  --shadow-hover:0 12px 28px rgba(15,27,45,.14);
  --nav-h:64px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",Helvetica,Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
section[id]{scroll-margin-top:calc(var(--nav-h) + 12px)}

.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 4px 16px rgba(15,27,45,.08)}
.nav-inner{display:flex;align-items:center;height:var(--nav-h);gap:26px}
.logo{font-size:20px;font-weight:800;color:var(--primary);white-space:nowrap}
.nav-menu{display:flex;gap:22px;margin-left:auto}
.nav-menu a{font-size:14px;color:var(--text-sub);padding:4px 0;transition:color .2s}
.nav-menu a:hover{color:var(--primary)}
.nav-download{flex:none;background:var(--primary);color:#fff;font-size:13px;font-weight:600;padding:5px 12px;border-radius:999px;transition:background .2s}
.nav-download:hover{background:var(--primary-deep)}

.hero{padding:calc(var(--nav-h) + 56px) 0 64px;background:var(--card)}
.hero-inner{display:flex;align-items:center;gap:48px}
.hero-text{flex:1;min-width:0}
.hero h1{font-size:40px;font-weight:800;line-height:1.35}
.ver{color:var(--accent)}
.hero-desc{margin:18px 0 30px;color:var(--text-sub);font-size:16px;max-width:560px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 26px;border-radius:999px;font-size:15px;font-weight:600;white-space:nowrap;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.btn-primary{background:var(--primary);color:#fff}
.btn-dark{background:var(--dark);color:#fff}
.btn-light{background:#fff;color:var(--dark)}
.hero-img{flex:0 0 320px}
.hero-img img{border-radius:var(--radius);box-shadow:var(--shadow)}

.section{padding:72px 0}
.section-white{background:var(--card)}
.section-title{font-size:32px;text-align:center;font-weight:800;letter-spacing:.5px}
.section-sub{text-align:center;color:var(--text-sub);margin-top:8px;font-size:15px}
.section-dark .section-title{color:#fff}
.section-dark .section-sub{color:rgba(255,255,255,.65)}

.preview-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:40px}
.preview-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .25s,box-shadow .25s}
.preview-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.preview-cap{padding:12px 14px;font-size:14px;font-weight:600;text-align:center;border-top:1px solid var(--border)}

.intro-box{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:36px;margin-top:40px}
.intro-lead{font-size:15.5px;color:var(--text)}
.intro-points{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:28px}
.intro-point{background:var(--bg);border-radius:var(--radius-sm);padding:18px;border-left:3px solid var(--primary)}
.intro-point strong{display:block;font-size:15px;margin-bottom:6px}
.intro-point span{font-size:13.5px;color:var(--text-sub)}

.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px 22px;transition:transform .25s,box-shadow .25s}
.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.feature-icon{width:46px;height:46px;border-radius:12px;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800;margin-bottom:14px}
.feature-card h3{font-size:17px;margin-bottom:8px}
.feature-card p{font-size:13.5px;color:var(--text-sub)}

.compare-wrap{margin-top:40px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:auto}
.compare-table{width:100%;min-width:680px;border-collapse:collapse;table-layout:fixed}
.compare-table th,.compare-table td{padding:14px 16px;font-size:14px;text-align:center;border-bottom:1px solid var(--border)}
.compare-table thead th{background:var(--dark);color:#fff;font-weight:600}
.compare-table thead th.col-st{background:var(--primary)}
.compare-table td:first-child{text-align:left;font-weight:600;background:var(--bg)}
.compare-table .col-st{background:var(--primary-soft)}
.compare-table tbody tr:last-child td{border-bottom:none}
.compare-tip{display:none;margin-top:10px;font-size:12.5px;color:var(--text-sub);text-align:center}

.section-dark{background:var(--dark);color:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:44px}
.stat-item{background:var(--dark-2);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);padding:30px 20px;text-align:center;transition:transform .25s}
.stat-item:hover{transform:translateY(-4px)}
.stat-num{font-size:38px;font-weight:800;color:var(--accent);line-height:1.2}
.stat-label{font-size:14px;color:rgba(255,255,255,.72);margin-top:8px}

.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:transform .25s,box-shadow .25s}
.review-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.avatar{width:44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;flex:none}
.avatar.alt{background:var(--accent)}
.review-meta{min-width:0}
.review-name{font-size:15px;font-weight:600;color:var(--text)}
.review-stars{font-size:13px;color:var(--star);letter-spacing:2px;margin-top:2px}
.review-text{font-size:13.5px;color:var(--text-sub)}

.version-card{max-width:760px;margin:40px auto 0;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.version-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-bottom:18px;border-bottom:1px solid var(--border)}
.version-badge{background:var(--primary-soft);color:var(--primary-deep);font-weight:800;font-size:18px;padding:6px 16px;border-radius:999px}
.version-date{color:var(--text-sub);font-size:14px}
.version-list{list-style:none;margin-top:18px}
.version-list li{padding:9px 0;font-size:14.5px;color:var(--text);border-bottom:1px dashed var(--border)}
.version-list li:last-child{border-bottom:none}
.vtag{display:inline-block;font-size:12px;font-weight:600;padding:2px 8px;border-radius:999px;margin-right:8px;vertical-align:1px}
.vtag-new{background:#e6f4ea;color:#1e7d3c}
.vtag-opt{background:var(--primary-soft);color:var(--primary-deep)}
.vtag-fix{background:#fff1e0;color:var(--accent)}

.faq-list{max-width:760px;margin:40px auto 0}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:14px;overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;background:none;border:none;cursor:pointer;padding:16px 18px;font-size:15px;font-weight:600;color:var(--text);text-align:left}
.faq-icon{flex:none;width:24px;height:24px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700;transition:transform .25s}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a p{padding:0 18px 16px;font-size:14px;color:var(--text-sub)}
.faq-item.open .faq-a{max-height:320px}

.download{padding:72px 0;background:var(--dark);color:#fff;text-align:center}
.download h1{font-size:34px;font-weight:800}
.download-meta{margin:14px 0 30px;color:rgba(255,255,255,.75);font-size:14px}
.download-btns{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.download-slogan{margin-top:22px;color:rgba(255,255,255,.8);font-size:14.5px}

.footer{background:var(--dark-2);padding:26px 0;text-align:center;border-top:1px solid rgba(255,255,255,.08)}
.footer-copy{color:rgba(255,255,255,.6);font-size:13px}
.footer-link{color:rgba(255,255,255,.85);text-decoration:none}
.footer-link:hover{color:#fff}

.to-top{position:fixed;right:24px;bottom:24px;width:44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;box-shadow:var(--shadow-hover);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .25s,visibility .25s,transform .25s;z-index:99}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--primary-deep)}

@media (max-width:1024px){
  .preview-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .hero-img{flex-basis:280px}
  .nav-menu{gap:14px}
}
@media (max-width:768px){
  .nav-menu{display:none}
  .nav-inner{justify-content:space-between;gap:10px}
  .section{padding:52px 0}
  .section-title{font-size:26px}
  .hero{padding:calc(var(--nav-h) + 36px) 0 44px}
  .hero-inner{flex-direction:column;gap:30px}
  .hero-text{text-align:center}
  .hero h1{font-size:30px}
  .hero-desc{margin:16px auto 26px;max-width:none;font-size:15px}
  .hero-btns{flex-direction:column;width:100%}
  .hero-btns .btn{width:100%}
  .hero-img{flex:none;width:100%;max-width:340px;margin:0 auto}
  .preview-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .intro-points{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .stat-num{font-size:30px}
  .compare-tip{display:block}
  .download-btns{flex-direction:column;width:100%}
  .download-btns .btn{width:100%}
  .download-meta{font-size:12.5px;white-space:nowrap}
  .to-top{right:16px;bottom:16px}
}