*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --text:#1f2937;
  --text-secondary:#6b7280;
  --bg:#ffffff;
  --bg-gray:#f3f4f6;
  --border:#e5e7eb;
  --primary:#2563eb;
  --primary-hover:#1d4ed8;
  --radius:8px;
  --max:1080px
}
html{font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

.site-header{background:var(--bg);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:56px}
.logo{display:flex;align-items:center;gap:8px;font-size:17px;font-weight:600;color:var(--text);text-decoration:none}
.logo:hover{text-decoration:none;color:var(--text)}
.logo img{width:28px;height:28px}
.site-nav{display:flex;gap:4px}
.site-nav a{padding:8px 14px;font-size:14px;color:var(--text-secondary);border-radius:var(--radius);text-decoration:none}
.site-nav a:hover{background:var(--bg-gray);color:var(--text);text-decoration:none}
.site-nav a.active{color:var(--primary);font-weight:500}
.site-nav a.btn-nav{background:var(--primary);color:#fff;font-weight:500}
.site-nav a.btn-nav:hover{background:var(--primary-hover);color:#fff}

.page-banner{background:var(--bg-gray);border-bottom:1px solid var(--border);padding:48px 0}
.page-banner h1{font-size:28px;font-weight:600;margin-bottom:12px;color:var(--text)}
.page-banner p{font-size:15px;color:var(--text-secondary);max-width:640px;line-height:1.7}
.page-banner .actions{margin-top:20px;display:flex;gap:10px;flex-wrap:wrap}

.btn{display:inline-block;padding:9px 20px;font-size:14px;font-weight:500;border-radius:var(--radius);text-decoration:none;border:1px solid transparent;cursor:pointer;line-height:1.4}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);color:#fff}
.btn-secondary{background:var(--bg);color:var(--text);border-color:var(--border)}
.btn-secondary:hover{background:var(--bg-gray);color:var(--text)}

.section{padding:40px 0}
.section-title{font-size:20px;font-weight:600;margin-bottom:20px;color:var(--text)}
.section-desc{font-size:14px;color:var(--text-secondary);margin-bottom:24px;max-width:720px}

.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.feature-item{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.feature-item h3{font-size:15px;font-weight:600;margin-bottom:8px}
.feature-item p{font-size:13px;color:var(--text-secondary);line-height:1.65}

.tag-list{display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:13px;padding:4px 12px;background:var(--bg-gray);border:1px solid var(--border);border-radius:4px;color:var(--text-secondary)}

.two-col{display:grid;grid-template-columns:1fr 280px;gap:32px;padding:40px 0}
.content h2{font-size:18px;font-weight:600;margin:28px 0 12px;color:var(--text)}
.content h2:first-child{margin-top:0}
.content p{font-size:14px;color:var(--text-secondary);margin-bottom:12px;line-height:1.7}
.content ul{margin:0 0 16px 20px;font-size:14px;color:var(--text-secondary)}
.content li{margin-bottom:6px;line-height:1.65}

.sidebar .card{background:var(--bg-gray);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:16px}
.sidebar .card h4{font-size:13px;font-weight:600;margin-bottom:10px;color:var(--text)}
.sidebar .card ul{list-style:none;margin:0}
.sidebar .card li{font-size:13px;padding:6px 0;border-bottom:1px solid var(--border);color:var(--text-secondary)}
.sidebar .card li:last-child{border-bottom:none}
.sidebar .card .btn{display:block;text-align:center;margin-top:12px;width:100%}

.info-table{width:100%;border-collapse:collapse;font-size:14px;margin:12px 0 20px}
.info-table th,.info-table td{padding:10px 12px;border:1px solid var(--border);text-align:left}
.info-table th{background:var(--bg-gray);font-weight:600;font-size:13px;color:var(--text)}
.info-table td{color:var(--text-secondary)}
.info-table code{font-family:Consolas,Monaco,monospace;font-size:12px;background:var(--bg-gray);padding:1px 5px;border-radius:3px;color:var(--text)}

.step-list{counter-reset:step;margin:16px 0}
.step-item{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--border)}
.step-item:last-child{border-bottom:none}
.step-item::before{counter-increment:step;content:counter(step);flex-shrink:0;width:28px;height:28px;background:var(--bg-gray);border:1px solid var(--border);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;color:var(--text-secondary)}
.step-item h3{font-size:14px;font-weight:600;margin-bottom:4px}
.step-item p{font-size:13px;color:var(--text-secondary)}

.version-card{display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:24px 28px;margin:32px 0 28px;flex-wrap:wrap}
.version-card .ver-label{font-size:13px;color:var(--text-secondary);margin-bottom:4px}
.version-card .ver-num{font-size:36px;font-weight:700;color:var(--text);line-height:1.1}
.version-card .ver-meta{font-size:13px;color:var(--text-secondary);margin-top:6px}
.version-card .ver-actions{display:flex;gap:10px;flex-wrap:wrap}

.platform-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:28px}
.platform-card{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:24px 20px;text-align:center;display:flex;flex-direction:column;align-items:center}
.platform-card .plat-icon{font-size:40px;line-height:1;margin-bottom:12px}
.platform-card h3{font-size:17px;font-weight:600;margin-bottom:6px}
.platform-card .plat-desc{font-size:13px;color:var(--text-secondary);margin-bottom:4px;line-height:1.5;flex:1}
.platform-card .plat-file{font-size:12px;color:var(--text-secondary);font-family:Consolas,Monaco,monospace;margin-bottom:16px}
.platform-card .btn-download{display:block;width:100%;padding:14px 20px;font-size:15px;font-weight:600;border-radius:var(--radius);text-decoration:none!important;text-align:center}
.platform-card .btn-download.btn-primary{font-size:16px}

.dl-more{text-align:center;font-size:13px;color:var(--text-secondary);margin:8px 0 32px}
.dl-more a{font-weight:500}

.notice-box{background:#eff6ff;border:1px solid #bfdbfe;border-radius:var(--radius);padding:14px 16px;font-size:13px;color:#1e40af;margin-top:28px;line-height:1.65}

.faq-item{margin-bottom:20px}
.faq-item h3{font-size:14px;font-weight:600;margin-bottom:6px}
.faq-item p{font-size:13px;color:var(--text-secondary);line-height:1.65}

.site-footer{border-top:1px solid var(--border);padding:24px 0;margin-top:20px;background:var(--bg-gray)}
.site-footer p{font-size:13px;color:var(--text-secondary);text-align:center;line-height:1.8}

.banner-row{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.banner-row .banner-img img{width:100%;height:auto;border-radius:12px;border:1px solid var(--border);box-shadow:0 4px 20px rgba(0,0,0,.06)}

.content-block{margin:36px 0;padding:28px;background:var(--bg-gray);border:1px solid var(--border);border-radius:12px}
.content-block h2{font-size:18px;font-weight:600;margin:0 0 14px;color:var(--text)}
.content-block p{font-size:14px;color:var(--text-secondary);margin-bottom:10px;line-height:1.75}
.content-block img{display:block;width:100%;max-width:520px;height:auto;margin:16px auto;border-radius:8px;border:1px solid var(--border)}
.note{font-size:13px;color:var(--text-secondary);padding:12px 14px;background:#fff;border-left:3px solid var(--primary);margin:14px 0;line-height:1.65}

.img-row{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:20px 0}
.img-row img{width:100%;height:auto;border-radius:8px;border:1px solid var(--border)}

.page-img{display:block;width:100%;max-width:960px;height:auto;margin:0 auto 28px;border-radius:16px;border:1px solid var(--border);box-shadow:0 12px 40px rgba(37,99,235,.12),0 4px 12px rgba(0,0,0,.06)}
.banner-row .banner-img img{box-shadow:0 16px 48px rgba(37,99,235,.15)}
.content-block img{box-shadow:0 8px 24px rgba(37,99,235,.1)}

@media(max-width:768px){
  .feature-grid{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
  .banner-row{grid-template-columns:1fr}
  .img-row{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:1fr}
  .version-card{flex-direction:column;align-items:flex-start}
  .page-banner{padding:32px 0}
  .page-banner h1{font-size:24px}
}