/* General Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f7f7f7;
    color: #333;
}

/* Header Styles */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #f1f1f1;
    padding: 1px 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.logo img {
    height: 40px;
    margin-bottom: -5px;
}

.nav a {
    text-decoration: none;
    color: #333;
    font-size: 18px;
    font-weight: bold;
}

.user a {
    text-decoration: none;
    color: blue;
    font-size: 14px;
}

/* Main Content */
main {
    padding: 10px;
}

h1 {
    font-size: 24px;
    text-align: center;
    margin-bottom: 20px;
}

.category {
    margin-bottom: 40px;
}

h2 {
    font-size: 20px;
    margin-bottom: 10px;
}

h3 {
    font-size: 18px;
    margin-bottom: 10px;
    font-style: italic;
}

.challenges {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.challenge {
    background-color: #e3f2fd;
    border-radius: 8px;
    padding: 15px;
    width: 80px;
    text-align: center;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.challenge:hover {
    background-color: #bbdefb;
}

.choose-level {
    text-align: center;
    margin-top: 40px;
}

h2 {
    font-size: 24px;
    color: #333;
    margin-bottom: 20px;
}

.levels {
    display: flex;
    justify-content: space-around;
}

.level {
    background-color: #eee;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    width: 250px;
    transition: background-color 0.3s;
}

.level img {
    width: 150px;
    height: 150px;
}

.level p {
    margin-top: 10px;
    font-size: 18px;
    font-weight: bold;
}

.level:hover {
    background-color: #ddd;
}