:root { --primary
: #0052ff; --text: #333; --bg: #f8f9fa
; --accent: #2563eb; }
        * { box-sizing: border-box; margin: 
0; padding: 0; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei',
 sans-serif; line-height: 1.6; color: var(--text); background: var(--bg); }

        .container { max-width: 1200px; margin: 0 auto; padding: 0
 20px; }
        header { background: #fff; padding: 15px 0; position
: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 5
px rgba(0,0,0,0.05); }
        nav { display: flex; justify-content
: space-between; align-items: center; }
        .nav-links { display: flex; gap
: 0; align-items: center; }
        .nav-links a { text-decoration: none; color
: #666; padding: 0 15px; font-weight: 500; transition: color
 0.3s; }
        .btn { padding: 10px 20px; border-radius: 6
px; cursor: pointer; text-decoration: none; display: inline-block; transition: 0.3s
; }
        .btn-primary { background: var(--primary); color: #fff; }
        .
hero { padding: 80px 0; text-align: center; background: linear-gradient(1
35deg, #f0f4ff 0%, #ffffff 100%); }
        h1 { font
-size: 3rem; margin-bottom: 20px; color: #111; }
        .
grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1
fr)); gap: 20px; margin-top: 40px; }
        .card {
 background: #fff; padding: 25px; border-radius: 12px; box-shadow: 0
 4px 15px rgba(0,0,0,0.05); transition: transform 0.3s
; }
        .card:hover { transform: translateY(-5px); }
        footer { background: #1
a1a1a; color: #ccc; padding: 40px 0; text-align: center; margin
-top: 60px; }