*{
    box-sizing:border-box;
}

body{
    margin:0;
    padding:20px;
    background:#0b1015;
    color:#ffffff;
    font-family:Arial,sans-serif;
}

.container{
    max-width:900px;
    margin:auto;
}

h1{
    text-align:center;
    margin-bottom:25px;
}

.card{
    background:#18222d;
    border-radius:16px;
    padding:20px;
    margin-bottom:20px;
}

button{
    width:100%;
    padding:15px;
    border:none;
    border-radius:10px;
    background:#f97316;
    color:white;
    font-size:18px;
    font-weight:bold;
    cursor:pointer;
}

button:hover{
    background:#ea580c;
}
.exercise-item{
    background:#243140;
    border-radius:12px;
    padding:15px;
    margin-bottom:12px;
}

.exercise-name{
    font-size:20px;
    font-weight:bold;
    margin-bottom:8px;
}

.favorite-btn{
    background:#475569;
    margin-top:10px;
}
#timerDisplay{
    font-size:72px;
    font-weight:bold;
    text-align:center;
    margin:20px 0;
}

.timer-card{
    text-align:center;
}