*,*::after,*::before{
    box-sizing: border-box;
    font-family: "Roboto", sans-serif;   
}

body{
    margin: 0;
    padding: 0;
    /* background-color: gold; */
}

.roboto-regular {
    font-family: "Roboto", sans-serif;  
    font-weight: 400;  /* 可以選100~900*/
    font-style: normal; /*Italic 斜體 */
}

.header{
    display: flex;
    justify-content: space-between;
    align-items: center;
    
    padding: 1rem;
}

.header_left{
    display: flex;
    align-items: center;
}

.header_menu{
    /* margin-left: 16px;
    margin-right: 16px; */
    margin: 0 16px;
}

.youtube-logo{
    margin-left: 16px;
}

.menu_icons{
    display: grid;
    grid-template-columns: repeat(4, auto);
    align-items: center;
    grid-gap: 1.5rem;
}

.menu_chennal{
    width: 36px;
    height: 36px;
    border-radius: 50%;
}

.search_bar{
    display: flex;
    flex-grow: 3;;
    margin: 0 4rem;
    flex-shrink: 0;
}


.search_input{
    width: 100%;
    font-size: 1rem;
    padding: 0.6em;
    border: 1px solid #c6c6c6;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}


.search_btn{
    display: flex;
    align-items: center;
    padding: 0 1.25rem;
    border: 1px solid #c6c6c6;
    background-color: #F8F8F8;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-left: none;
    cursor: pointer;
}


.search_btn:hover{
    background-color: #f0f0f0;
}


.search_bar a {
    display: flex;
    align-items: center;
    margin-left: 1rem;
}




.mainbody{
    display: flex;
    height: calc(100% - 72px);
}


.sidebar{
    background-color: white;
    width: 230px;
}

.sidebar_category{
    display: flex;
    cursor: pointer;
    align-items: center;
    padding: 15px 25px;
}

.sidebar_font{
    font-size: 0.9rem;
    margin-left: 24px;
}


.sidebar_category.active{
    background-color: #E5E5E5;
    font-weight: bold;
}

.sidebar_category:hover{
    background-color: #F9F9F9;
}

.sidebar_category.active:hover{
    background-color: #DDD;
}


.vedio_container{
    display: flex;
    flex-direction: column; /* 改變方向 */ 

}

.thumbnail_images{
    width: 100%;
    height: 100%;
}
.video_description{
    display: flex;
    align-items: flex-start;
    margin-top: 1rem;
}

.channel_icon{
    border-radius: 50%;
    width: 36px;
    height: 36px;
    margin-right: 1rem;
}

.video_details{
    display: flex;
    flex-direction: column;
}

.video_title{

    font-weight: bold;
    color: black;
    text-decoration: none;
    margin-bottom: 0.5rem
}
.video_channel_name , .video_metadata{

    color: #555;
    text-decoration: none;
}


.video_channel_name{
    font-size: 0.9rem;;
    text-decoration: none;
    margin-bottom: 0.1rem;
    transition: color 0.5s;

}

.video_channel_name:hover{
    color: #111;
}


.thumbnail{
    position: relative;
    display: flex;

}

.thumbnail::before{
    content:attr(data_duration);
    position: absolute;
    right: 5px;
    bottom: 5px;
    background-color: black;
    border-radius: 0.3rem;
    color: white;
    font-size: 0.9rem;
    padding: 0.1rem 0.3rem;
    

}

.video{
    width: 100%;
    background: color #f9f9f9;;
}

.video_section{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    grid-gap: 3rem 1rem;
    margin: 0 1.5rem;
    padding: 3rem 0;

    border-top: 1px solid #DDD;
}

.video-section:first-child{
    border:nane;

}

.video_section_title{
    display: flex;
    grid-column: 1 / -1;
    justify-content: space-between;
    align-items: center;
    margin: -0.5rem 0;
}


.video_section_tilte_close{
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: #555;
}