* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  :root {
    font-size: 62.5%;
  
    --ff-timer: 'Roboto', sans-serif;
  
    --bg-body: #FFFFFF;
    --bg-btn-sound: #E1E1E6;
    --bg-btn-soundSelected: #02799D;
  
    --fc-timer: #323238;
    --fc-btn-soundSelected: #FFFFFF;
    --fc-icons: #323238;
    --fc-input: #323238;
    --fc-input-selected:#fff;
  }

  .dark{
    --bg-body: #121214;
    --bg-btn-sound: #29292E;
    --bg-btn-soundSelected:  #0A3442;
  
    --fc-timer: #fff;
    --fc-btn-soundSelected: #FFFFFF;
    --fc-icons: #C4C4CC;
    --fc-input: #C4C4CC;
  }
  
  body {
    background-color: var(--bg-body);
    display: grid;
    min-height: 100vh;
  }

  .theme{
   position: fixed;
   top: 6rem;
   right: 6rem;
  }

  .btn-light,
  .btn-dark {
    background-color: transparent;
    border: none;
  }

  .hide{
    display: none;
  }

  .theme:hover{
    cursor: pointer;
    transform: scale(1.1);
  }
  
  main{
    display: flex;
    gap: 19.2rem;
    align-self: center;
    justify-self: center;
  }
  
  .focusTimer {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  
  #timer{
    /* width: clamp(12rem, 12rem + 30vw, 32.1rem); */
    max-width: 32.1rem;
    display: flex;
    margin-bottom: 1.7rem;
  }
  
  #timer span {
    font-family: var(--ff-timer);
    font-weight: 500;
    font-size: clamp(6rem, 5rem + 10vw, 12.6rem);
    line-height: 14.8rem;
    text-align: center;
    text-transform: uppercase;
  
    color: var(--fc-timer);
  }
  
  #controls {
    /* width: clamp(10rem, 10rem + 30vw, 31.2rem); */
    max-width: 31.2rem;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 4rem;
  }
  
  #controls button{
    border: none;
    background-color: transparent;
    cursor: pointer;
    padding: 0;
  }
  
  #controls button:hover{
    transform: scale(1.1);
  }
  
  #sound{
    width: clamp(10rem, 10rem + 30vw, 30.8rem);    
  }
  
  .colum-1{
    margin-bottom: 3.2rem;
  }
  
  .colum-1, 
  .colum-2{
    display: flex;
    gap: 3.2rem;
  }

  .card{
    border: none;
    background-color: var(--bg-btn-sound);
    border-radius: 2.4rem;
    width: 13.8rem;
    height: 15.2rem;
    cursor: pointer;
  }

  #volume{
    width: 9rem;
    height: 0.3rem;
    margin-top: 3rem;
    appearance: none;
    accent-color: var(--fc-input);
    background-color: var(--fc-input);
  }

  svg path{
    fill: var(--fc-icons);
  }
  
  .on{
    background-color: var(--bg-btn-soundSelected);
  }
  
  .on svg path{
    fill: var(--fc-btn-soundSelected);
  }

  .on input#volume{
    accent-color: var(--fc-input-selected);
    background-color: var(--fc-input-selected);
  }
  
  @media (max-width: 70rem) {
   main{
    flex-direction: column;
    gap: 5rem;
    align-items: center;
   }
   .icon-theme{
    top: 2rem;
    right: 4rem;
   }
   #controls{
    gap: 1rem;
   }
   #timer{
    margin-bottom: 0rem;
   }
   #timer span {
    line-height: 12rem;
   }
   input#volume{
    width: 6rem;
  }
  }