* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f0f4f8;
    color: #263238;
    line-height: 1.6;
}

header {
    background-color: #142d4e;
    color: white;
    text-align: center;
    padding: 30px 15px;
}

header h1 {
    margin-bottom: 5px;
    font-size: 36px;
}

header p {
    margin-top: 0;
}

nav {
    background-color: #087e8b;
}

.menu {
    list-style: none;
    display: flex;
    justify-content: center;
    margin: 0;
    padding: 0;
}

.menu li {
    position: relative;
}

.menu a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 16px 22px;
    font-weight: bold;
}

.menu a:hover,
.menu a:focus {
    background-color: #ffba08;
    color: #142d4e;
}

.dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    list-style: none;
    margin: 0;
    padding: 0;
    background-color: #142d4e;
    border-top: 3px solid #ffba08;
    z-index: 10;
}

.dropdown a {
    padding: 12px 16px;
    font-weight: normal;
    border-bottom: 1px solid #35516f;
}

.menu li:hover > .dropdown,
.menu li:focus-within > .dropdown {
    display: block;
}

main {
    max-width: 1000px;
    margin: 30px auto;
    padding: 0 20px;
}

section {
    background-color: white;
    margin-bottom: 25px;
    padding: 25px;
    border-radius: 8px;
    border-left: 5px solid #087e8b;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.08);
    scroll-margin-top: 20px;
}

h2 {
    color: #142d4e;
    margin-top: 0;
}

h3 {
    color: #087e8b;
}

article {
    padding: 5px 15px;
    margin: 15px 0;
    border-bottom: 1px solid #d9e2ec;
    scroll-margin-top: 20px;
}

article:last-child {
    border-bottom: none;
}

footer {
    background-color: #142d4e;
    color: white;
    text-align: center;
    padding: 18px;
    margin-top: 30px;
}

@media (max-width: 650px) {
    .menu {
        flex-direction: column;
    }

    .menu a {
        padding: 12px 18px;
    }

    .dropdown {
        position: static;
        width: 100%;
    }

    main {
        padding: 0 12px;
    }
}