/* Base Reset */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.6; color: #333; background-color: #f9f9f9; }
a { text-decoration: none; color: inherit; }
.container { width: 90%; max-width: 1200px; margin: 0 auto; }

/* Header */
.site-header { background: #fff; box-shadow: 0 2px 5px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100; }
.site-header .container { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; }
.logo h1 a { font-size: 24px; color: #2563eb; font-weight: bold; }
.main-nav ul { list-style: none; display: flex; gap: 20px; }
.main-nav a { font-weight: 500; transition: color 0.3s; }
.main-nav a:hover { color: #2563eb; }

/* Hero */
.hero { background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%); color: #fff; padding: 80px 0; text-align: center; }
.hero-content h2 { font-size: 42px; margin-bottom: 20px; }
.hero-content p { font-size: 18px; margin-bottom: 30px; opacity: 0.9; max-width: 800px; margin-left: auto; margin-right: auto; }
.download-buttons { display: flex; justify-content: center; gap: 20px; margin-bottom: 20px; }
.btn { padding: 12px 30px; border-radius: 5px; font-size: 18px; font-weight: bold; transition: transform 0.2s, box-shadow 0.2s; }
.btn-primary { background: #f59e0b; color: #fff; box-shadow: 0 4px 6px rgba(245, 158, 11, 0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 12px rgba(245, 158, 11, 0.4); }
.btn-secondary { background: rgba(255,255,255,0.2); border: 1px solid #fff; }
.btn-secondary:hover { background: #fff; color: #1e3a8a; }
.version-info { font-size: 14px; opacity: 0.8; }

/* Features */
.features { padding: 60px 0; background: #fff; }
.features h2 { text-align: center; font-size: 32px; margin-bottom: 40px; color: #1e3a8a; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.feature-card { padding: 30px; background: #f8fafc; border-radius: 8px; border: 1px solid #e2e8f0; transition: transform 0.3s; }
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px rgba(0,0,0,0.05); }
.feature-card h3 { font-size: 20px; margin-bottom: 15px; color: #0f172a; }

/* SEO Content */
.seo-content { padding: 60px 0; }
.seo-content h2 { font-size: 28px; margin-bottom: 20px; color: #1e3a8a; }
.seo-content article { background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.02); }
.seo-content p { margin-bottom: 15px; font-size: 16px; color: #475569; }
.seo-content h3 { font-size: 22px; margin: 25px 0 15px; color: #334155; }
.seo-content ol { margin-left: 20px; margin-bottom: 20px; color: #475569; }
.seo-content li { margin-bottom: 10px; }

/* FAQ */
.faq { padding: 60px 0; background: #fff; }
.faq h2 { text-align: center; font-size: 32px; margin-bottom: 40px; color: #1e3a8a; }
.faq-item { margin-bottom: 25px; border-bottom: 1px solid #e2e8f0; padding-bottom: 20px; }
.faq-item h3 { font-size: 18px; color: #0f172a; margin-bottom: 10px; }
.faq-item p { color: #64748b; }

/* Footer */
.site-footer { background: #1e293b; color: #cbd5e1; padding: 40px 0; text-align: center; }
.footer-links { margin-bottom: 20px; }
.footer-links a { margin: 0 15px; color: #94a3b8; transition: color 0.3s; }
.footer-links a:hover { color: #fff; }
.site-footer p { font-size: 14px; line-height: 1.8; }

/* Responsive */
@media (max-width: 768px) {
    .main-nav { display: none; }
    .hero-content h2 { font-size: 32px; }
    .download-buttons { flex-direction: column; }
}