/* Reset some default browser styles */
body, h1, h2, p {
    margin: 0;
    padding: 0;
}

/* Define basic styles */
body {
    font-family: Arial, sans-serif;
    background-color: #f3f3f3;
}

header {
    background-color: #3498db;
    color: #fff;
    padding: 20px;
    text-align: center;
}

nav {
    background-color: #34495e;
    color: #fff;
    padding: 10px;
}

nav ul {
    list-style: none;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

section.main-content {
    background-color: #fff;
    padding: 20px;
    margin: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

footer {
    background-color: #34495e;
    color: #fff;
    text-align: center;
    padding: 10px;
}

/* Styles for the vocabulary list */
ul#phrase-list {
    list-style: none;
}

ul#phrase-list li {
    margin-bottom: 10px;
}

ul#phrase-list strong {
    font-weight: bold;
}

/* Styles for buttons and input fields */
button, input[type="text"] {
    padding: 10px;
    margin: 5px;
    border: none;
    border-radius: 5px;
    background-color: #3498db;
    color: #fff;
    cursor: pointer;
}

button:hover {
    background-color: #2980b9;
}

input[type="text"]:focus {
    outline: none;
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.7);
}