:root {
            --primary: #00d2ff;
            --secondary
: #3a7bd5;
            --bg-light: #f8fbff;
            --text
-dark: #333;
            --text-muted: #666;
            --container
-max: 1200px;
        }
        * { box-sizing: border-box;
 margin: 0; padding: 0; }
        body { font-family: 'PingFang SC',
 'Microsoft YaHei', sans-serif; line-height: 1.6; color: var(--text-dark); background
-color: #fff; }
        .container { max-width: var(--container-max); margin: 0 auto
; padding: 0 20px; }
        a { text-decoration: none; color: inherit
; transition: 0.3s; }
        header { padding: 15px 0; background
: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.
05); position: sticky; top: 0; z-index: 1000; }

        nav { display: flex; align-items: center; justify-content: space-between; }
        
.nav-links { display: flex; align-items: center; gap: 0; }
        .nav-links a
 { padding: 10px 15px; font-weight: 500; font-size: 14px
; }
        .nav-links a:hover { color: var(--secondary); }
        .ai-page-logo { height
: 40px; width: auto; }
        .btn { display: inline-block; padding: 12
px 25px; border-radius: 30px; background: linear-gradient(135deg, var(--
primary), var(--secondary)); color: #fff; font-weight: bold; cursor: pointer; border: none; transition
: transform 0.2s; }
        .btn:hover { transform: translateY(-2px); box
-shadow: 0 5px 15px rgba(58,123,213,
0.3); }
        
        #hero { padding: 80px 0; text-align: center; background
: linear-gradient(135deg, #f0f9ff 0%, #e0f7fa
 100%); }
        .hero-title { font-size: 3rem; margin-bottom: 20
px; color: #1a3a5a; }
        .hero-subtitle { font-size: 1.2
rem; color: var(--text-muted); margin-bottom: 30px; max-width: 700px
; margin-left: auto; margin-right: auto; }
        
        .section { padding: 6
0px 0; }
        h2 { font-size: 2rem; text-align: center; margin
-bottom: 40px; position: relative; }
        h2::after { content: ''; display
: block; width: 50px; height: 3px; background: var(--secondary); margin: 
10px auto 0; }
        
        .grid-3 { display: grid; grid-template-columns
: repeat(3, 1fr); gap: 20px; }
        .card { padding:
 30px; border-radius: 15px; background: #fff; border: 1px
 solid #eee; transition: 0.3s; }
        .card:hover { border-color: var
(--secondary); box-shadow: 0 10px 20px rgba(0,0,0
,0.05); }
        
        table { width: 100%; border-collapse:
 collapse; margin-top: 20px; }
        th, td { padding: 15px; border: 
1px solid #eee; text-align: center; }
        
        .faq-item { margin-bottom: 1
5px; border-bottom: 1px solid #eee; }
        .faq-q { padding: 
15px; font-weight: bold; cursor: pointer; display: flex; justify-content: space-between; }

        .faq-a { padding: 15px; display: none; color: var(--text-muted); }
        

        footer { background: #1a1a1a; color: #ccc; padding: 40px 0; text
-align: center; }
        .footer-links { margin-bottom: 20px; }
        .
footer-links a { margin: 0 10px; color: #999; }
        .copy
 { font-size: 12px; margin-top: 20px; }

        @media (max-width:
 768px) {
            .grid-3 { grid-template-columns: 1fr; }
            
.hero-title { font-size: 2rem; }
            .nav-links { display: none; }
        }