h1{
    position: relative;
    text-align: center;
}
h3{
    position: relative;
    text-align: center;
}

.operation-instructions {
    text-align: left;
    max-width: 500px;
    margin: 30px auto;
    font-size: 0.9rem;
    line-height: 1.8;
    color: #333;

}
.instruction-title{
    text-align: center;
    margin-bottom: 10px;
    border-bottom: 1px solid #eee;
    padding-bottom: 5px;

}

.instruction-list {
    padding-left: 25px;
}

.button-container{
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 40px;
}

#start{
    background-color: #40BA8D;
    border-radius: 50%;
    line-height: 100px;
    border: none;
    width: 100px;
    height: 100px;
    padding: 0;
    color:aliceblue;
    font-size: 20px;

}

#start:active{
    -webkit-transform: translate(0, 3px);
    transform: translate(0, 3px);
    -webkit-box-shadow: 0 2px 0 #40BA8D;
    box-shadow: 0 2px 0 #40BA8D;
}

#stop{
    background-color: 	#D93A49;
    border-radius: 50%;
    line-height: 100px;
    border: none;
    width: 100px;
    height: 100px;
    padding: 0;
    color: aliceblue;
    font-size: 20px;

}

#stop:active{
    -webkit-transform: translate(0, 3px);
    transform: translate(0, 3px);
    -webkit-box-shadow: 0 2px 0 #D93A49;
    box-shadow: 0 2px 0 #D93A49;
}

#playBtn{
    background-color: #1A4472	;
    border-radius:50%;
    line-height: 50px;
    border: none;
    width:80px;
    height: 80px;
    padding: 0;
    color: 	aliceblue;
    font-size:20px;

}

#playBtn:active{
    -webkit-transform: translate(0, 3px);
    transform: translate(0, 3px);
    -webkit-box-shadow: 0 2px 0 #1A4472;
    box-shadow: 0 2px 0 #1A4472;
}

#estimateBtn{
    background-color: #E15A28	;
    border-radius:10%;
    line-height: 20px;
    border: none;
    width:200px;
    height: 100px;
    padding: 0;
    color: 	aliceblue;
    font-size:40px;

}

#estimateBtn:active{
    -webkit-transform: translate(0, 3px);
    transform: translate(0, 3px);
    -webkit-box-shadow: 0 2px 0 #E15A28;
    box-shadow: 0 2px 0 #E15A28;
}

.controls-container{
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin-top: 20px;

}

.result-container{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-top: 40px;
}

.result-item{
    text-align: center;
}

.result-item .label{
    font-weight: 600px;
    margin-bottom: 4px;
}

.result-main .label{
    font-size: 24px;
}

.result-main .value{
    font-size: 88px;
}


.result-sub .label{
    font-size: 14px;
    color: #666;
}

.result-sub .value{
    font-size: 32px;
    color: #444
}