/* Mock Ad Container */
.ad-container {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    padding: 10px;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    text-align: center;
    border-top: 1px solid #eee;
}

.ad-content {
    max-width: 728px; /* Standard leaderboard ad width */
    margin: 0 auto;
    padding: 5px;
}

.ad-container img {
    max-height: 90px;
    width: auto;
    display: block;
    margin: 0 auto;
}

.ad-label {
    font-size: 0.7rem;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 5px;
}

.close-ad {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #ccc;
    font-size: 1.2rem;
    cursor: pointer;
}

.close-ad:hover {
    color: #999;
}