:
root { --primary: #2563eb; --dark: #1e293b; --light
: #f8fafc; --accent: #7c3aed; }
        * { margin: 0; padding
: 0; box-sizing: border-box; }
        body { font-family: 'PingFang SC',
 sans-serif; line-height: 1.6; color: #334155; background: #
ffffff; }
        .container { max-width: 1200px; margin: 0 auto
; padding: 0 20px; }
        header { padding: 20px 0; background: #fff
; border-bottom: 1px solid #e2e8f0; position: sticky; top: 0; z
-index: 100; }
        nav { display: flex; align-items: center; justify-content: space
-between; }
        .nav-links { display: flex; gap: 0; }
        .nav
-links a { padding: 10px 15px; color: #64748b; text-
decoration: none; font-weight: 500; transition: color 0.3s; }
        .nav
-links a:hover { color: var(--primary); }
        .hero { padding: 80px
 0; text-align: center; background: linear-gradient(135deg, #eff6ff 0%, #
fef2f2 100%); }
        h1 { font-size: 3rem; margin-bottom: 
20px; color: var(--dark); }
        .btn { display: inline-block; padding: 12
px 30px; background: var(--primary); color: #fff; border-radius: 8px; text-
decoration: none; transition: transform 0.2s; }
        .btn:hover { transform: translateY(-2px); }

        .section { padding: 60px 0; }
        .grid-4 { display: grid
; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap
: 20px; }
        .card { padding: 30px; border: 1px solid #e
2e8f0; border-radius: 12px; background: #fff; transition: box-shadow 0.3
s; }
        .card:hover { box-shadow: 0 10px 25px rgba(0,0
,0,0.05); }
        footer { background: var(--dark); color: #94a3b
8; padding: 40px 0; text-align: center; }
        .float-k
efu { position: fixed; bottom: 30px; right: 30px; z-index: 9
9; }