:root { --primary: #6366f1; --accent: #f472b6; --text: #1e293b; --bg: #f8fafc; --white: #ffffff; }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: var(--white); padding: 15px 0; box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .nav-links { display: flex; gap: 0; }
        .nav-links a { text-decoration: none; color: var(--text); padding: 10px 15px; font-weight: 500; transition: color 0.3s; }
        .hero { padding: 100px 0; text-align: center; background: linear-gradient(135deg, #eef2ff, #fce7f3); }
        h1 { font-size: 3rem; margin-bottom: 20px; color: var(--primary); }
        .btn { display: inline-block; padding: 12px 30px; background: var(--primary); color: white; border-radius: 8px; text-decoration: none; font-weight: bold; margin: 10px; transition: transform 0.2s; }
        .section { padding: 80px 0; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: var(--white); padding: 30px; border-radius: 16px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); transition: 0.3s; }
        .card:hover { transform: translateY(-10px); }
        footer { background: #1e293b; color: #cbd5e1; padding: 40px 0; text-align: center; }
        .ai-page-logo { width: 120px; }
        .feedback-item { margin-bottom: 20px; padding: 15px; border-left: 4px solid var(--primary); background: #f1f5f9; }