* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: #0f172a;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
        }
        .container { text-align: center; padding: 2rem; }
        h1 {
            font-size: 3rem;
            margin-bottom: 0.5rem;
            background: linear-gradient(90deg, #00d2ff, #3a7bd5);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .subtitle { color: #8892b0; margin-bottom: 3rem; font-size: 1.1rem; }
        .cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            max-width: 800px;
            margin: 0 auto;
        }
        .card {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 16px;
            padding: 2rem;
            text-decoration: none;
            color: #fff;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }
        .card:hover {
            transform: translateY(-5px);
            background: rgba(255, 255, 255, 0.1);
            border-color: #3a7bd5;
            box-shadow: 0 10px 40px rgba(58, 123, 213, 0.3);
        }
        .card-icon { font-size: 2.5rem; margin-bottom: 1rem; }
        .card-title { font-size: 1.3rem; font-weight: 600; margin-bottom: 0.5rem; }
        .card-desc { color: #8892b0; font-size: 0.9rem; }
        footer {
            margin-top: 3rem;
            color: #555;
            font-size: 0.85rem;
        }
        
        .header {
            position: fixed;
            top: 0;
            width: 100%;
            height: 60px;
            background: rgba(128, 128, 128, 0.5);
            backdrop-filter: blur(10px);
            z-index: 1000;
            display: flex;
            align-items: center;
            justify-content: center
        }
        
        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 1024px;
            padding: 0 20px;
        }
        
        .logo {
            font-size: 18px;
            font-weight: bold;
            color: white;
            margin: 0;
        }
        
        .login-btn {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: white;
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .login-btn:hover {
            background: rgba(255, 255, 255, 0.2);
        }
        
        .container {
            margin-top: 70px;
        }

        .footer {
            position: fixed;
            bottom: 0;
            width: 100%;
            height: 60px;
            background: rgba(128, 128, 128, 0.5);
            backdrop-filter: blur(10px);
            z-index: 1000;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .footer-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 1024px;
            padding: 0 20px;
        }
        
        .social-icons {
            display: flex;
            gap: 15px;
        }
        
        .social-icon {
            color: white;
            font-size: 20px;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        
        .social-icon:hover {
            transform: scale(1.2);
        }