*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body{
    height: 100vh;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #141e30, #243b55);
    padding: 20px;
}

.container{
    width: 100%;
    max-width: 420px;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 40px 30px;
    border-radius: 25px;
    text-align: center;
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

.timer h1{
    color: white;
    font-size: 55px;
    letter-spacing: 3px;
    margin-bottom: 35px;
}

.switches{
    display: flex;
    justify-content: center;
    gap: 20px;
}

#btn{
    width: 70px;
    height: 70px;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    transition: 0.3s;
    color: white;
}

.switches button:nth-child(1){
    background: #ff9800;
}

.switches button:nth-child(2){
    background: #4caf50;
}

.switches button:nth-child(3){
    background: #f44336;
}

#btn:hover{
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(255,255,255,0.5);
}

/* Tablet */
@media (max-width: 768px){

    .container{
        max-width: 360px;
        padding: 35px 25px;
    }

    .timer h1{
        font-size: 45px;
    }

    #btn{
        width: 60px;
        height: 60px;
        font-size: 20px;
    }
}

/* Mobile */
@media (max-width: 480px){

    .container{
        max-width: 300px;
        padding: 30px 20px;
    }

    .timer h1{
        font-size: 35px;
        letter-spacing: 2px;
    }

    .switches{
        gap: 15px;
    }

    #btn{
        width: 55px;
        height: 55px;
        font-size: 18px;
    }
}

/* Small Mobile */
@media (max-width: 320px){

    .container{
        padding: 25px 15px;
    }

    .timer h1{
        font-size: 28px;
    }

    #btn{
        width: 48px;
        height: 48px;
        font-size: 16px;
    }
}