body {
    font-family: sans-serif;
    margin: 0;
    line-height: 1.6;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background: #50a3a2;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

header nav ul {
    padding: 0;
    list-style: none;
}

header nav ul li {
    display: inline;
    margin: 0 10px;
}

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

#hero {
    background: #327a81;
    color: #fff;
    padding: 4rem 1rem;
    text-align: center;
}

#hero .cta-button {
    display: inline-block;
    background: #fff;
    color: #333;
    padding: 0.8rem 2rem;
    margin-top: 1rem;
    text-decoration: none;
    border-radius: 5px;
}

#courses,
#about,
#contact {
    padding: 2rem 1rem;
    text-align: center;
}

.course-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 20px;
}

.course-card {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    width: 300px;
    text-align: left;
}

.course-card h3 {
    margin-top: 0;
}

.course-card .buy-button {
    display: block;
    width: 100%;
    padding: 0.5rem;
    background: #50a3a2;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 1rem;
}

footer {
    text-align: center;
    padding: 1rem 0;
    background: #333;
    color: #fff;
    margin-top: 2rem;
}

#cart {
    padding: 2rem 1rem;
    text-align: center;
    background-color: #e9e9e9;
}

#cart-items {
    margin-top: 20px;
    text-align: left;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

#cart-items div {
    background: #fff;
    padding: 1rem;
    margin-bottom: 10px;
    border-radius: 5px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#cart-total {
    font-size: 1.2em;
    font-weight: bold;
    margin-top: 20px;
}