*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#e74c3c;
  --primary-dark:#c0392b;
  --accent:#3498db;
  --text:#2c3e50;
  --text-light:#5d6d7e;
  --bg:#f8f9fa;
  --white:#fff;
  --border:#e8ecef;
  --shadow:0 2px 12px rgba(0,0,0,.08);
  --radius:8px;
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","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%;height:auto}
.container{max-width:1100px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--white);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;flex-wrap:wrap;gap:12px}
.logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:var(--primary)}
.logo img{width:36px;height:36px}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{padding:8px 16px;border-radius:var(--radius);color:var(--text);font-size:.95rem}
.nav a:hover,.nav a.active{background:#fef2f0;color:var(--primary)}

/* Hero */
.hero{background:linear-gradient(135deg,#fff 0%,#fef5f4 100%);padding:60px 0 50px;border-bottom:1px solid var(--border)}
.hero-badge{display:inline-block;background:#fef2f0;color:var(--primary);padding:4px 14px;border-radius:20px;font-size:.85rem;margin-bottom:16px}
.hero h1{font-size:2rem;line-height:1.35;margin-bottom:16px;color:var(--text)}
.hero p{color:var(--text-light);font-size:1.05rem;max-width:640px;margin-bottom:28px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.hero-tag{background:var(--white);border:1px solid var(--border);padding:6px 14px;border-radius:20px;font-size:.85rem;color:var(--text-light)}
.btn{display:inline-block;padding:12px 28px;border-radius:var(--radius);font-size:1rem;font-weight:600;cursor:pointer;border:none;transition:all .2s}
.btn-primary{background:var(--primary);color:var(--white)}
.btn-primary:hover{background:var(--primary-dark);color:var(--white)}
.btn-outline{background:var(--white);color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:var(--white)}
.btn-group{display:flex;flex-wrap:wrap;gap:12px}

/* Quick links */
.quick-links{padding:40px 0}
.quick-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.quick-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;transition:transform .2s,box-shadow .2s}
.quick-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.quick-card .icon{font-size:2rem;margin-bottom:10px}
.quick-card h3{font-size:1rem;margin-bottom:6px}
.quick-card p{font-size:.85rem;color:var(--text-light)}

/* Section */
.section{padding:50px 0}
.section-title{text-align:center;margin-bottom:36px}
.section-title h2{font-size:1.6rem;margin-bottom:10px}
.section-title p{color:var(--text-light);font-size:.95rem}

/* Features */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.feature-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.feature-card .icon{font-size:1.8rem;margin-bottom:12px}
.feature-card h3{font-size:1.1rem;margin-bottom:8px}
.feature-card p{color:var(--text-light);font-size:.92rem}
.feature-card .tag{display:inline-block;margin-top:10px;font-size:.8rem;color:var(--primary);background:#fef2f0;padding:3px 10px;border-radius:12px}

/* Steps */
.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.step-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:24px;position:relative}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;background:var(--primary);color:var(--white);border-radius:50%;font-weight:700;font-size:.9rem;margin-bottom:12px}
.step-card h3{font-size:1rem;margin-bottom:8px}
.step-card p{color:var(--text-light);font-size:.9rem}

/* Download cards */
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.download-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:28px;display:flex;flex-direction:column}
.download-card .icon{font-size:2.2rem;margin-bottom:12px}
.download-card h3{font-size:1.1rem;margin-bottom:6px}
.download-card p{color:var(--text-light);font-size:.9rem;flex:1;margin-bottom:16px}
.download-card .btn{width:100%;text-align:center}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden}
.faq-q{padding:16px 20px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"▾";color:var(--text-light);transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(180deg)}
.faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s;color:var(--text-light);font-size:.92rem}
.faq-item.open .faq-a{max-height:200px;padding:0 20px 16px}

/* Articles */
.article-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.article-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:box-shadow .2s}
.article-card:hover{box-shadow:var(--shadow)}
.article-card-body{padding:24px}
.article-card h3{font-size:1.05rem;margin-bottom:8px}
.article-card h3 a{color:var(--text)}
.article-card h3 a:hover{color:var(--primary)}
.article-card p{color:var(--text-light);font-size:.9rem;margin-bottom:12px}
.article-meta{font-size:.8rem;color:#95a5a6}
.article-content{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:36px;margin-bottom:30px}
.article-content h1{font-size:1.7rem;margin-bottom:12px}
.article-content .meta{color:var(--text-light);font-size:.85rem;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--border)}
.article-content h2{font-size:1.25rem;margin:28px 0 12px}
.article-content p{margin-bottom:16px;color:var(--text-light)}
.article-content ul,.article-content ol{margin:0 0 16px 24px;color:var(--text-light)}
.article-content li{margin-bottom:6px}

/* CTA */
.cta{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--white);padding:50px 0;text-align:center;border-radius:var(--radius);margin:20px 0}
.cta h2{font-size:1.5rem;margin-bottom:12px}
.cta p{opacity:.9;margin-bottom:24px}
.cta .btn{background:var(--white);color:var(--primary)}
.cta .btn:hover{background:#f0f0f0}

/* Footer */
.site-footer{background:#2c3e50;color:#bdc3c7;padding:40px 0 20px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;margin-bottom:30px}
.footer-grid h4{color:var(--white);margin-bottom:12px;font-size:.95rem}
.footer-grid a{color:#bdc3c7;font-size:.88rem;display:block;margin-bottom:6px}
.footer-grid a:hover{color:var(--white)}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid #3d566e;font-size:.82rem}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.85rem;color:var(--text-light)}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

@media(max-width:768px){
  .hero h1{font-size:1.5rem}
  .hero{padding:40px 0 30px}
  .section{padding:36px 0}
}