body {
    font-family: Arial, sans-serif;
    background: #181a20;
    color: #eee;
    margin: 0;
    padding: 0;
}

h1 {
    text-align: center;
    margin: 1em 0;
}

#tabs {
    text-align: center;
    margin-bottom: 1em;
}

.tab {
    background: #2c2f37;
    color: #eee;
    border: none;
    margin: 0 0.5em;
    padding: 0.5em 2em;
    cursor: pointer;
    font-size: 1em;
    border-radius: 8px 8px 0 0;
}

.tab.active {
    background: #6b64ff;
    color: #fff;
    font-weight: bold;
}

#content {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2em;
    padding: 1em;
}

.level {
    background: #222;
    border-radius: 12px;
    box-shadow: 0 2px 10px #0007;
    padding: 1em;
    width: 300px;
    text-align: center;
    margin-bottom: 2em;
}

.cover {
    width: 100%;
    max-width: 200px;
    border-radius: 8px;
    margin-bottom: 1em;
}

.info {
    margin-bottom: 1em;
}

button {
    background: #6b64ff;
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.5em 1em;
    font-size: 1em;
    cursor: pointer;
}