:root {
            --primary: #20a53a;
            --text-dark: #333;
            --text-muted: #777;
            --bg-light: #fefefe;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        header {
            padding: 1rem 2rem;
            border-bottom: 2px solid var(--primary);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        nav a {
            margin-left: 20px;
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 500;
        }

        nav a:hover {
            color: var(--primary);
        }

        main {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 2rem;
            text-align: center;
        }

        .hero-pattern {
            width: 120px;
            height: 120px;
            background: radial-gradient(circle, var(--primary) 20%, transparent 20%), 
                        radial-gradient(circle, var(--primary) 20%, transparent 20%);
            background-size: 30px 30px;
            background-position: 0 0, 15px 15px;
            opacity: 0.1;
            margin-bottom: 2rem;
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .desc {
            max-width: 600px;
            color: var(--text-muted);
            margin-bottom: 2rem;
        }

        footer {
            padding: 2rem;
            text-align: center;
            font-size: 0.8rem;
            color: var(--text-muted);
            border-top: 1px solid #eee;
        }

        .btlink {
            color: var(--primary);
            text-decoration: none;
        }

        @media (min-width: 768px) {
            h1 { font-size: 3.5rem; }
        }