/* .header is a flexbox container */
.header {
    height: 55px;
    
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;

    background-color: white;
    border-bottom-width: 1px;
    border-bottom-style: solid;
    border-bottom-color: rgb(228, 228, 228);
}

/* set specific width */
.left-section{
    display: flex;
    align-items: center;
}

.hamburger-menu{
    height: 24px;
    margin-left: 24px;
    margin-right: 24px;
}

.youtube-logo{
    height: 20px;
}

/* set flex: 1. because it will resize when the browser resizing */
/* max-width: 300px; = width can be <300px, but when grow to >300px, we limit it */
.middle-section{
    flex: 1;
    margin-left: 70px;
    margin-right: 35px;
    max-width: 500px;
    display: flex;
    align-items: center;
}

.search-bar{
    flex: 1;
    height: 36px;
    padding-left: 10px;
    font-size: 16px;
    /* border-width: 1px;
    border-style: solid;
    border-color: rgb(192, 192, 192); */
    border: 1px solid rgb(192, 192, 192);
    border-radius: 2px;
    box-shadow: inset 1px 2px 3px rgba(0, 0, 0, 0.05);
    width: 0;
}
/* box-shadow: inset 1px 2px 3px rgba(0, 0, 0, 0.05);
    inset = shadow inside, 1px = horizontal position, 2px = vertical position, 3px = blur
    rgba = 0,0,0,(transparency)
*/
/* width = 0; means remove default width and search box will shrink as much as possible */

.search-bar::placeholder{
    /* font-family: Roboto, Arial; */
    font-size: 16px;
}

.search-button{
    height: 40px;
    width: 66px;
    background-color: rgb(240, 240, 240 );
    border-width: 1px;
    border-style: solid;
    border-color: rgb(192, 192, 192);
    margin-left: -1px;
    margin-right: 10px;

}

.search-button,
.voice-search-button,
.upload-icon-container,
.youtube-apps-icon-container,
.notifications-icon-container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.search-button .tooltip,
.voice-search-button .tooltip,
.upload-icon-container .tooltip,
.youtube-apps-icon-container .tooltip,
.notifications-icon-container .tooltip{
    /* font-family: Roboto, Arial; */
    position: absolute;
    background: gray;
    color: white;
    padding: 4px 8px;
    border-radius: 2px;
    font-size: 12px;
    bottom: -30px;

    opacity: 0; /*to set the tooltip invisible, then when mouse hover, opacity become 1 */
    transition: opacity 0.15s; /* what to transition and set time */

    pointer-events: none;  /*when mouse hover over the tooltip, nothing is going to happen*/
    white-space: nowrap; /* prevent the text from wrapping around (eg: tooltip at voice search button)*/
}

.search-button:hover .tooltip,
.voice-search-button:hover .tooltip,
.upload-icon-container:hover .tooltip,
.youtube-apps-icon-container:hover .tooltip,
.notifications-icon-container:hover .tooltip{
    opacity: 1;
}

.search-icon{
    height: 25px;
    /* margin-top: 4px; */
}

.voice-search-button{
    height: 40px;
    width: 40px;
    border-radius: 20px; 
    border: none;
    background-color: rgb(245, 245, 245);
} 
/* trick: if set border-radius to half of the height, it will be round */

.voice-search-icon{
    height: 24px;
    /* margin-top: 4px; */
}

/* set specific width */
/* flex-shrink: 0; means no matter what happen, the flexbox won't shrink */
.right-section{
    width: 180px;
    margin-right: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.upload-icon{
    height: 24px;
}

.youtube-apps-icon{
    height: 24px;
}

.notifications-icon{
    height: 24px;
}

/* .notifications-icon-container{
    position: relative;
} */

.notifications-count{
    position: absolute;
    top: -2px;
    right: -5px;
    background-color: rgb(200, 0, 0);
    color: white;
    font-family: Roboto, Arial;
    font-size: 11px;
    padding: 2px 5px;
    border-radius: 10px;
}

.current-user-picture{
    height: 32px;
    border-radius: 16px;
}


/* flex-shrink: 0; = don't shrink
    width: 0; shrink
*/