.zh-level-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.btn-l {
    background: #f5f5f5;
    border: none;
    padding: 10px;
    cursor: pointer;
    text-align: center;
}
.btn-l img {
    max-width: 100px;
}
.level-name, .level-text, .level-number {
    font-size: 14px;
}

.zh-modal {
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: none;
}
.zh-modal-content {
    background: #fff;
    margin: 10% auto;
    padding: 20px;
    width: 90%;
    max-width: 600px;
    position: relative;
}
.zh-modal-close {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
}
.embed-container iframe {
    width: 100%;
    height: 315px;
}