* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    color: #263445;
    background-color: #f4f8fc;
}


header {
    background-color: #174a7e;
    color: white;
    text-align: center;
    padding: 30px 20px;
}

header h1 {
    margin: 0;
    font-size: 2.2rem;
}

header p {
    margin: 8px 0 0;
}


nav {
    background-color: #ffffff;
    border-bottom: 2px solid #d5e5f5;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0;
    padding: 12px;
}

nav a {
    display: block;
    color: #174a7e;
    text-decoration: none;
    font-weight: bold;
    padding: 10px 16px;
    border-radius: 5px;
}

nav a:hover,
nav a:focus {
    background-color: #174a7e;
    color: white;
}


main {
    max-width: 1000px;
    margin: 30px auto;
    padding: 30px;
    background-color: white;
    border-radius: 10px;
}

main ul {
    padding-left: 25px;
    margin-top: 10px;
    margin-bottom: 20px;
}

h2 {
    color: #174a7e;
}

h3 {
    color: #2368a0;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 20px auto;
}

a {
    color: #155ca0;
}

a:focus-visible {
    outline: 3px solid #e0a526;
    outline-offset: 3px;
}


footer {
    background-color: #174a7e;
    color: white;
    text-align: center;
    padding: 18px;
    margin-top: 30px;
}

footer p {
    margin: 0;
}


@media (max-width: 600px) {
    header h1 {
        font-size: 1.7rem;
    }

    nav ul {
        gap: 4px;
    }

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