body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 25px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease;
}

    .card:hover {
        transform: translateY(-5px);
    }


@media (max-width: 768px) {
    .flex-container {
        flex-direction: column;
    }

    .nav {
        flex-direction: column;
        align-items: center;
    }

    .nav-btn {
        width: 200px;
    }

    .header-card h1 {
        font-size: 2em;
    }
}