*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
body{
    background: #f7f7f5;
    font-family: Arial, Helvetica, sans-serif;
    color: #222;
}
.container{
    max-width: 500px;
    margin: auto;
    padding: 25px;
}
h1{
    text-align: center;
    margin-bottom: 10px;
}
.subtitle{
    text-align: center;
    color: #666;
    margin-bottom: 25px;
}
.card{
    background: white;
    border: 1px solid #e5e5e5;
    border-radius: 12px;
    padding: 20px;
}
label{
    display:block;
    margin-top: 15px;
    margin-bottom: 8px;
    font-weight: bold;
}
input,
select,
button{
    width:100%;
    padding:12px;
    border-radius: 8px;
    border: 1px solid #ddd;
    font-size: 16px;
}
button{
    margin-top: 20px;
    background: #111827;
    color: white;
    cursor: pointer;
}
button:hover{
    background: #000;
}
.button-group{
    display: flex;
    gap: 10px;
    margin-top: 15px;
}
.button-group button{
    flex: 1;
}
#countdown{
    margin-top: 30px;
    text-align: center;
    font-size: 38px;
    font-weight: bold;
}
@media(max-width:600px){
    .container{
        padding: 15px;
    }
    #countdown{
        font: size 30px;
    }
}