*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --accent:#0ea5e9;
  --text:#1e293b;
  --text-light:#64748b;
  --bg:#f1f5f9;
  --white:#fff;
  --border:#e2e8f0;
  --shadow:0 4px 24px rgba(0,0,0,.08);
  --radius:12px;
  --max:1140px;
}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:16px}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary)}
img{max-width:100%;display:block}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

.site-header{background:var(--white);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:0 2px 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-size:20px;font-weight:700;color:var(--text)}
.logo span{color:var(--primary)}
.nav{display:flex;gap:28px;list-style:none}
.nav a{color:var(--text);font-size:15px;font-weight:500}
.nav a:hover,.nav a.active{color:var(--primary)}
.nav-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--text)}

.hero{background:linear-gradient(135deg,#fff 0%,#eff6ff 50%,#f0fdfa 100%);padding:72px 0 64px;border-bottom:1px solid var(--border)}
.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.hero h1{font-size:36px;line-height:1.3;margin-bottom:16px;color:var(--text)}
.hero h1 em{font-style:normal;color:var(--primary)}
.hero-desc{font-size:17px;color:var(--text-light);margin-bottom:28px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:32px}
.tag{background:var(--white);border:1px solid var(--border);padding:6px 14px;border-radius:20px;font-size:13px;color:var(--text-light)}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:8px;font-size:15px;font-weight:600;transition:all .2s;border:none;cursor:pointer}
.btn-primary{background:var(--primary);color:var(--white)}
.btn-primary:hover{background:var(--primary-dark);color:var(--white);transform:translateY(-1px)}
.btn-outline{background:var(--white);color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:var(--white)}
.hero-cards{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.hero-card{background:var(--white);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .2s}
.hero-card:hover{transform:translateY(-3px)}
.hero-card .icon{font-size:28px;margin-bottom:8px}
.hero-card h3{font-size:15px;margin-bottom:4px}
.hero-card p{font-size:13px;color:var(--text-light)}

.section{padding:64px 0}
.section-header{text-align:center;margin-bottom:48px}
.section-header h2{font-size:28px;margin-bottom:12px}
.section-header p{color:var(--text-light);max-width:600px;margin:0 auto;font-size:15px}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--white);border-radius:var(--radius);padding:28px;border:1px solid var(--border);transition:box-shadow .2s}
.feature-card:hover{box-shadow:var(--shadow)}
.feature-card .icon{font-size:32px;margin-bottom:14px}
.feature-card h3{font-size:18px;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-light);margin-bottom:12px}
.feature-card .label{display:inline-block;font-size:12px;background:#eff6ff;color:var(--primary);padding:3px 10px;border-radius:4px;font-weight:600}

.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step-card{background:var(--white);border-radius:var(--radius);padding:24px;border:1px solid var(--border);position:relative}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--primary);color:var(--white);border-radius:50%;font-weight:700;font-size:16px;margin-bottom:14px}
.step-card h3{font-size:16px;margin-bottom:8px}
.step-card p{font-size:14px;color:var(--text-light)}

.download-hero{text-align:center;padding:56px 0 40px}
.download-hero h1{font-size:32px;margin-bottom:12px}
.download-hero p{color:var(--text-light);max-width:560px;margin:0 auto}
.platform-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px}
.platform-card{background:var(--white);border-radius:var(--radius);padding:32px 24px;text-align:center;border:1px solid var(--border);transition:all .2s}
.platform-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.platform-card .icon{font-size:40px;margin-bottom:16px}
.platform-card h3{font-size:18px;margin-bottom:8px}
.platform-card p{font-size:14px;color:var(--text-light);margin-bottom:20px}
.platform-card .btn{width:100%;justify-content:center}

.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:15px}
.faq-q::after{content:"▾";color:var(--text-light);transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(180deg)}
.faq-a{padding:0 24px 18px;font-size:14px;color:var(--text-light);display:none;line-height:1.8}
.faq-item.open .faq-a{display:block}

.articles-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.article-card{background:var(--white);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;transition:box-shadow .2s}
.article-card:hover{box-shadow:var(--shadow)}
.article-card-body{padding:24px}
.article-card h3{font-size:17px;margin-bottom:8px;line-height:1.4}
.article-card h3 a{color:var(--text)}
.article-card h3 a:hover{color:var(--primary)}
.article-card p{font-size:14px;color:var(--text-light);margin-bottom:14px}
.article-meta{font-size:12px;color:#94a3b8;display:flex;gap:12px;flex-wrap:wrap}
.article-content{max-width:780px;margin:0 auto;background:var(--white);border-radius:var(--radius);padding:40px;border:1px solid var(--border)}
.article-content h1{font-size:30px;margin-bottom:12px;line-height:1.3}
.article-content .meta{color:var(--text-light);font-size:14px;margin-bottom:32px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.article-content h2{font-size:22px;margin:32px 0 14px}
.article-content p{margin-bottom:16px;color:var(--text-light);font-size:15px}
.article-content ul,.article-content ol{margin:0 0 16px 24px;color:var(--text-light);font-size:15px}
.article-content li{margin-bottom:6px}

.cta{background:linear-gradient(135deg,var(--primary),#0284c7);color:var(--white);text-align:center;padding:56px 20px;border-radius:var(--radius);margin:0 20px}
.cta h2{font-size:26px;margin-bottom:12px}
.cta p{opacity:.9;margin-bottom:24px;font-size:15px}
.cta .btn{background:var(--white);color:var(--primary)}
.cta .btn:hover{background:#eff6ff}

.site-footer{background:#0f172a;color:#94a3b8;padding:48px 0 24px;margin-top:64px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:32px}
.footer-grid h4{color:var(--white);font-size:15px;margin-bottom:14px}
.footer-grid p,.footer-grid li{font-size:14px;line-height:2}
.footer-grid ul{list-style:none}
.footer-grid a{color:#94a3b8}
.footer-grid a:hover{color:var(--white)}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid #1e293b;font-size:13px}

.update-badge{display:inline-block;background:#ecfdf5;color:#059669;font-size:12px;padding:3px 10px;border-radius:4px;font-weight:600}

@media(max-width:900px){
  .hero-inner,.features-grid,.steps-grid,.platform-grid,.articles-grid,.footer-grid{grid-template-columns:1fr}
  .hero-cards{grid-template-columns:1fr 1fr}
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--white);flex-direction:column;padding:16px 20px;border-bottom:1px solid var(--border);gap:16px}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  .hero h1{font-size:28px}
  .hero{padding:48px 0}
}