style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box; 
}

:root {
    --text-color: white;
    --bg-url: url(assets/bg-mobile.jpg);
    --stroke-color: rgba(255, 255, 255, 0.5);
    --surface-color: rgba(255, 255, 255, 0.05);
    --surface-color-hover: rgba(255, 255, 255, 0.02);
    --highlight-color-hover: rgba(255, 255, 255, 0.2);
    --switch-icon: url(assets/moon-stars.svg);
 
}

.light {
    --text-color: black;
    --bg-url: url(assets/bg-mobile-light.jpg);
    --stroke-color: rgba(0, 0, 0, 0.5);
    --surface-color: rgba(0, 0, 0, 0.05);
    --surface-color-hover: rgba(0, 0, 0, 0.02);
    --highlight-color-hover: rgba(0, 0, 0, 0.1);
    --switch-icon: url(assets/sun.svg);
}

body * {
    font-family: 'Inter', sans-serif;
    color: var(--text-color);

}

body  {
    background: var(--bg-url) top center/cover no-repeat;
    width: 100%;
    max-width: 600px;
    margin: 56px auto 0;
    padding: 0 24px;
    height: 100vh;
}


#profile {
    padding: 24px;
    text-align: center;
}

img#avatar {
    border: 2px solid var(--stroke-color);
    border-radius: 50%;
    width: 112px;
}

p#username{
    padding-top: 8px;
    font-weight: 500;
    line-height: 24px;
}

#switch{
    position: relative;
    width: 64px;
    margin: 4px auto;
    
}

#switch button{
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 50%;
    background: white var(--switch-icon) no-repeat center;
    
    position: absolute;
    z-index: 1;
    top: 50%;
    left: 50;
    transform: translateY(-50%);

    animation: slide-back .2s;
}

#switch button:hover{
    outline: 8px solid var(--highlight-color-hover);
}

.light #switch button{
    animation: slide-in .2s forwards;
}

.light #switch button:hover{
    outline: 8px solid var(--highlight-color-hover);
}


#switch span{
    display: block;
    width: 64px;
    height: 24px;
    background-color: var(--surface-color);
    border: 1px solid var(--stroke-color);
    border-radius: 9999px;
    -webkit-backdrop-filter: blur(4px);

}

/* Aplicou o flex para poder criar o gap entre os li */
#buttons {
    list-style: none;
    list-style-position: inside;

    display: flex;
    flex-direction: column;
    gap: 16px;

    padding: 24px 0;
}

/* Aplicando as propriedades do flex no li e não no ul pq queremos o ul#buttons pra que os links ocupem 100% da largura */
#buttons li a{
    border: 1px solid var(--stroke-color);
    border-radius: 8px;
    background: var(--surface-color);
    -webkit-backdrop-filter: blur(4px);

    display: flex; 
    justify-content: center;
    align-items: center;
    padding: 16px 24px;

    text-decoration: none;
    font-weight: 500;

    transition: background 0.2s;
}

#buttons li a:hover{
    border: 1.5px solid var(--text-color);
    background: var(--surface-color-hover);

}


/* Nesse caso já aplicamos o flex no container pq queremos os links no tamanho real*/
#social{
    list-style: none;
    list-style-position: inside;
    padding: 24px 0;
    display: flex;    
    flex-direction: row;
    align-content: center;
    justify-content: center;
    
    font-size: 24px;
}


#social a{
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px; /* Coloca o padding aqui pra não ficar reposicionando no hover */
    border-radius: 50%; /* Coloca o radius aqui pra não ficar alterando na transição */

    transition: background 0.2s;
}

#social a:hover{
    background: var(--highlight-color-hover);
}

footer {
    padding: 24px 0;
    text-align: center;
    font-size: 14px ;
}

@media (min-width: 700px){
    :root{
        --bg-url: url(assets/bg-desktop.jpg);
    }

    .light{
        --bg-url: url(assets/bg-desktop-light.jpg)
    }
}

@keyframes slide-in {
    from {
        left: 0;
    }
    to {
        left: 50%;
    }
}

@keyframes slide-back {
    from {
        left: 50%;
    }
    to {
        left: 0;
    }
}