body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
    color: #333;
}

header {
    background-color: #0d1b2a;
    padding: 10px 0;
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header .logo img {
    height: 50px;
}

header ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;

}

header ul li {
    margin-left: 20px;
    
}

header ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

header ul li a:hover {
    color: #1fa2ff;
}

main {
    max-width: 850px;
    margin: 40px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

main h1 {
    color: #0d1b2a;
    text-align: center;
}

main h2 {
    color: #1fa2ff;
    margin-top: 20px;
}

main h3 {
    color: #0d1b2a;
    margin-top: 15px;
}

main p, main ul {
    line-height: 1.6;
    margin-bottom: 20px;
}

main ul {
    padding-left: 20px;
}

footer {
    text-align: center;
    padding: 20px 0;
    background-color: #0d1b2a;
    color: #fff;
}

footer p {
    margin: 0;
}

.certification {
    display: flex;
    align-items: center;
    margin: 20px 0;
}
.certification img {
    width: 500px;
    height: auto;
    margin-right: 20px;
}
.certification p {
    margin: 0;
}
footer {
    background-color: #1d2d69;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}

@media (max-width: 768px) {
    header nav {
        flex-direction: column;
        align-items: flex-start;
    }
    
    header .logo img {
        height: 40px;
    }

    header ul {
        display: none;
    }

    main {
        margin: 20px 10px;
        padding: 15px;
    }

    .certification {
        flex-direction: column;
        align-items: flex-start;
    }

    .certification img {
        width: 100%;
        margin: 0 0 10px 0;
    }
}

@media (max-width: 480px) {
    header nav {
        padding: 0 10px;
    }

    main {
        margin: 15px 5px;
        padding: 10px;
    }

    footer {
        padding: 10px 0;
    }
}