* {
    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, 0.2);
    --highlight-color: rgba(255, 255, 255, 0.2);
    --switch-bg-url: 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: rgba(0,  0,  0,   0.1);
    --switch-bg-url: url(assets/sun.svg);
    
}

body {
    /* background: color ou img , reapeat position/size */
    
    /*background: var(--bg-url) no-repeat center/cover;  /* atalho ou short*/
        background: var(--bg-url);
        background-repeat: no-repeat;
        background-position: center;
        background-size: cover;
        height: 100vh;

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

#container {
    width: 100%;
    max-width: 588px;
    margin: 56px auto;
    padding: 0 24px;
   
    
}
/* como img é inline pode usar text-aling*/
#profile {
    text-align: center;
    padding: 24px;
}

#profile img {
    border-radius: 50%;
    width: 112px;
    margin: 0 auto;
}

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


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

/* estrategia de alinhamento absoluto*/
#switch button {
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 50%;
    background: white var(--switch-bg-url) no-repeat center ; 
   /* background-position: center;
    background-repeat: no-repeat;*/
    position: absolute; /* removendo do fluxo*/
    z-index: 1;
    top: 50%;
    transform: translateY(-50%) ;
    animation: slide-back 0.5s;

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

.light #switch button {
    animation: slide-in 0.5s forwards;
}

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






/*   links listas     */
ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 24px 0;
}

ul li  a{ 
   display: flex;
    justify-content: center;
    align-items: center;
    padding: 16px;
    background: var(--surface-color); 
    border: 1px solid var(--stroke-color);
    border-radius: 8px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);

    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s;

}
/* Os pseudosseletores são uma forma de selecionar elementos HTML com base em seu estado ou posição em relação a outros elementos.*/
ul li a:hover{
    background: var(--surface-color-hover);
    border: 1.5px solid var(--text-color); 
     
}

/* socials links icones */
#social-links {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    font-size: 24px;
    padding: 24px 0;
     
}
#social-links a {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 16px;
    border-radius: 50%;
}
#social-links   a:hover{
    background: var(--highlight-color);
   
}

/* foooter */

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

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

/* animation */

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