*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#0088cc;
  --primary-dark:#006699;
  --accent:#24a1de;
  --bg:#f4f8fb;
  --surface:#fff;
  --text:#1a2332;
  --muted:#5a6a7e;
  --border:#e2eaf0;
  --radius:12px;
  --shadow:0 4px 24px rgba(0,80,130,.08);
  --max:1120px;
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:0 1px 8px rgba(0,0,0,.04)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;color:var(--text)}
.logo img{width:36px;height:36px;border-radius:8px}
.nav{display:flex;align-items:center;gap:28px}
.nav a{color:var(--muted);font-size:.95rem;font-weight:500}
.nav a:hover,.nav a.active{color:var(--primary)}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);margin:5px 0;border-radius:2px}

/* Hero */
.hero{background:linear-gradient(135deg,#0088cc 0%,#005f99 55%,#003d66 100%);color:#fff;padding:72px 0 80px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:400px;height:400px;background:rgba(255,255,255,.06);border-radius:50%}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;position:relative;z-index:1}
.hero h1{font-size:2.4rem;line-height:1.25;margin-bottom:16px;font-weight:800}
.hero p{font-size:1.05rem;opacity:.92;margin-bottom:28px;max-width:480px}
.hero-btns{display:flex;flex-wrap:wrap;gap:14px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:50px;font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:#fff;color:var(--primary);box-shadow:0 4px 16px rgba(0,0,0,.15)}
.btn-primary:hover{color:var(--primary-dark)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.6)}
.btn-outline:hover{background:rgba(255,255,255,.12);border-color:#fff}
.hero-visual{text-align:center}
.hero-phone{width:220px;margin:0 auto;filter:drop-shadow(0 20px 40px rgba(0,0,0,.3))}
.hero-badge{display:inline-block;background:rgba(255,255,255,.15);padding:6px 16px;border-radius:20px;font-size:.85rem;margin-bottom:20px;backdrop-filter:blur(4px)}

/* Features */
.section{padding:72px 0}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:1.85rem;margin-bottom:10px}
.section-title p{color:var(--muted);max-width:560px;margin:0 auto}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--surface);border-radius:var(--radius);padding:32px 24px;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .2s}
.feature-card:hover{transform:translateY(-4px)}
.feature-icon{width:52px;height:52px;background:linear-gradient(135deg,var(--accent),var(--primary));border-radius:14px;display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:1.5rem}
.feature-card h3{font-size:1.1rem;margin-bottom:8px}
.feature-card p{color:var(--muted);font-size:.92rem}

/* Download section */
.download-section{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.platform-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.platform-card{text-align:center;padding:32px 20px;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg);transition:border-color .2s,box-shadow .2s}
.platform-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.platform-card .icon{font-size:2.4rem;margin-bottom:12px}
.platform-card h3{font-size:1rem;margin-bottom:6px}
.platform-card p{font-size:.82rem;color:var(--muted);margin-bottom:16px}
.btn-download{display:inline-block;padding:10px 24px;background:var(--primary);color:#fff;border-radius:50px;font-size:.88rem;font-weight:600}
.btn-download:hover{background:var(--primary-dark);color:#fff}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--surface);border-radius:var(--radius);margin-bottom:12px;border:1px solid var(--border);overflow:hidden}
.faq-q{padding:18px 22px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;user-select:none}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--primary);transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 22px;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s;color:var(--muted);font-size:.93rem}
.faq-item.open .faq-a{max-height:300px;padding:0 22px 18px}

/* Articles */
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.article-card{background:var(--surface);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .2s}
.article-card:hover{transform:translateY(-3px)}
.article-card-body{padding:22px}
.article-card h3{font-size:1.05rem;margin-bottom:8px;line-height:1.4}
.article-card p{font-size:.88rem;color:var(--muted);margin-bottom:14px}
.article-meta{font-size:.78rem;color:var(--muted);margin-bottom:10px}
.read-more{font-size:.88rem;font-weight:600}

/* Article page */
.article-page{background:var(--surface);border-radius:var(--radius);padding:40px 48px;box-shadow:var(--shadow);border:1px solid var(--border);max-width:820px;margin:0 auto}
.article-page h1{font-size:1.75rem;margin-bottom:12px;line-height:1.35}
.article-page .meta{color:var(--muted);font-size:.85rem;margin-bottom:28px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.article-page h2{font-size:1.25rem;margin:28px 0 12px;color:var(--text)}
.article-page p,.article-page li{color:#334155;margin-bottom:14px;font-size:.95rem}
.article-page ul,.article-page ol{padding-left:22px;margin-bottom:16px}
.article-page .tip{background:#eef7fc;border-left:4px solid var(--primary);padding:14px 18px;border-radius:0 8px 8px 0;margin:20px 0;font-size:.9rem}
.dynamic-block{background:#f0f7fb;border-radius:8px;padding:16px 20px;margin:20px 0;font-size:.9rem;color:var(--muted);border:1px dashed #b8d9ec}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.85rem;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.breadcrumb span{margin:0 8px}

/* Footer */
.site-footer{background:#1a2332;color:rgba(255,255,255,.75);padding:48px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:36px}
.footer-grid h4{color:#fff;margin-bottom:14px;font-size:.95rem}
.footer-grid p,.footer-grid a{font-size:.88rem;color:rgba(255,255,255,.65);line-height:2}
.footer-grid a:hover{color:#fff}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);font-size:.82rem;color:rgba(255,255,255,.45)}

/* Page header */
.page-header{background:linear-gradient(135deg,#0088cc,#005f99);color:#fff;padding:48px 0;text-align:center}
.page-header h1{font-size:1.9rem;margin-bottom:8px}
.page-header p{opacity:.85;font-size:.95rem}

/* Sitemap page */
.sitemap-list{max-width:640px;margin:0 auto;background:var(--surface);border-radius:var(--radius);padding:32px 40px;box-shadow:var(--shadow);border:1px solid var(--border)}
.sitemap-list h2{font-size:1.1rem;margin:24px 0 12px;color:var(--primary)}
.sitemap-list h2:first-child{margin-top:0}
.sitemap-list ul{list-style:none;padding:0}
.sitemap-list li{padding:8px 0;border-bottom:1px solid var(--border)}
.sitemap-list li:last-child{border-bottom:none}

/* Tutorial page */
.tutorial-layout{display:grid;grid-template-columns:240px 1fr;gap:32px;align-items:start}
.tutorial-toc{position:sticky;top:80px;background:var(--surface);border-radius:var(--radius);padding:24px 20px;border:1px solid var(--border);box-shadow:var(--shadow)}
.tutorial-toc h3{font-size:.95rem;margin-bottom:14px;color:var(--text)}
.tutorial-toc ul{list-style:none;padding:0}
.tutorial-toc li{margin-bottom:6px}
.tutorial-toc a{font-size:.88rem;color:var(--muted);display:block;padding:6px 10px;border-radius:6px;transition:background .2s,color .2s}
.tutorial-toc a:hover,.tutorial-toc a.active{background:#eef7fc;color:var(--primary)}
.tutorial-content{background:var(--surface);border-radius:var(--radius);padding:40px 44px;box-shadow:var(--shadow);border:1px solid var(--border)}
.tutorial-content h2{font-size:1.35rem;margin:36px 0 14px;padding-top:8px;border-top:1px solid var(--border)}
.tutorial-content h2:first-of-type{margin-top:0;border-top:none;padding-top:0}
.tutorial-content h3{font-size:1.08rem;margin:22px 0 10px;color:var(--primary-dark)}
.tutorial-content p,.tutorial-content li{color:#334155;font-size:.95rem;margin-bottom:12px}
.tutorial-content ul,.tutorial-content ol{padding-left:22px;margin-bottom:16px}
.step-box{display:flex;gap:16px;background:var(--bg);border-radius:var(--radius);padding:20px 22px;margin-bottom:14px;border:1px solid var(--border)}
.step-num{flex-shrink:0;width:36px;height:36px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.95rem}
.step-body h4{font-size:1rem;margin-bottom:6px}
.step-body p{margin-bottom:0;font-size:.9rem;color:var(--muted)}
.related-articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:32px}
.related-articles a{display:block;padding:18px;background:var(--bg);border-radius:var(--radius);border:1px solid var(--border);font-size:.9rem;font-weight:600;color:var(--text);transition:border-color .2s}
.related-articles a:hover{border-color:var(--primary);color:var(--primary)}
.related-articles span{display:block;font-weight:400;font-size:.82rem;color:var(--muted);margin-top:6px}

@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;text-align:center}
  .hero p{margin:0 auto 28px}
  .hero-btns{justify-content:center}
  .hero-visual{display:none}
  .features-grid,.platform-grid,.article-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .article-page{padding:28px 22px}
  .tutorial-layout{grid-template-columns:1fr}
  .tutorial-toc{position:static}
  .tutorial-content{padding:28px 22px}
  .related-articles{grid-template-columns:1fr}
}
@media(max-width:768px){
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--surface);flex-direction:column;padding:16px 20px;gap:16px;border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  .hero h1{font-size:1.75rem}
  .platform-grid{grid-template-columns:repeat(2,1fr)}
}