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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
        }

        header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        h1 {
            text-align: center;
            padding: 1rem 0;
            font-size: 2rem;
        }

        nav {
            display: flex;
            justify-content: center;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            padding: 1rem 0;
        }

        nav a {
            color: white;
            text-decoration: none;
            padding: 0.75rem 1.5rem;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 5px;
            transition: all 0.3s ease;
            font-weight: 500;
        }

        nav a:hover {
            background: rgba(255, 255, 255, 0.25);
            transform: translateY(-2px);
        }

        nav a.active {
            background: rgba(255, 255, 255, 0.3);
            border-bottom: 3px solid white;
        }