:root {
            --bg-gradient: radial-gradient(circle, #ffffff 0%, #f0f2f5 100%);
            --text-main: #000000;
            --text-secondary: #4a4a4a;
            --font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        }

        body, html {
            height: 100%;
            margin: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background: var(--bg-gradient);
            font-family: var(--font-family);
            color: var(--text-main);
        }

        .container {
            background: #ffffff;
            padding: 40px 60px;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
            text-align: center;
            max-width: 800px;
            width: 90%;
        }