#panel-ejercicios {
    position: fixed;
    top: 60px;
    right: 20px;
    width: 1020px;
    max-height: 85vh;
    overflow-y: auto;
    background: #111;
    color: #fff;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 0 25px rgba(0, 0, 0, .6);
    display: none;
    z-index: 9999;
}

#panel-ejercicios h3 {
    text-align: center;
    margin-bottom: 15px;
}

.ej-btn {
    width: 100%;
    background: #222;
    color: #fff;
    border: none;
    padding: 8px;
    text-align: left;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 5px;
}

.clases {
    display: none;
    margin-bottom: 10px;
}

.clase-btn {
    width: 100%;
    background: #333;
    color: #ddd;
    border: none;
    padding: 6px;
    margin: 3px 0;
    border-radius: 5px;
    cursor: pointer;
}