:root {
            --primary: #007cba;
            --secondary: #004a59;
            --text: #333;
            --bg: #f9f9f9;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            margin: 0;
            color: var(--text);
            background-color: var(--bg);
        }

        header {
            background: #fff;
            padding: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-bottom: 3px solid var(--primary);
        }

        .logo {
            max-height: 80px;
        }

        .hero {
            background-image: url('/assets/clouds_header.jpg');
            background-size: cover;
            background-position: center;
            padding: 4rem 1rem;
            text-align: center;
            color: #fff;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }

        .container {
            max-width: 900px;
            margin: 2rem auto;
            padding: 0 1rem;
        }

        .card {
            background: #fff;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }

        nav {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            margin-top: 2rem;
        }

        nav a {
            color: var(--primary);
            text-decoration: none;
            padding: 0.5rem;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 0.9rem;
        }

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

        footer {
            text-align: center;
            padding: 2rem;
            font-size: 0.8rem;
            color: #666;
        }

        @media (min-width: 768px) {
            .hero { padding: 8rem 1rem; }
        }