.bg_headpagegioithieu{    position: relative;
padding: 15rem 0;
background-repeat: no-repeat;
background-size: cover;
background-position: center;}
.bg_headpagegioithieu:before {
position: absolute;
left: 0;
top: 0;
content: "";
width: 100%;
height: 100%;
z-index: 2; 
background-image: linear-gradient(180deg, #00000082 0%, #111424 95%);
}
.tieude_pagegioithieu{    color: #efa765;
font-size: 5rem;
font-family: yesevaone;
position: relative;
z-index: 2;
text-align: center;}
.box_noidunggioithieu{ background-color: #232533;padding: 5rem 0; }

.noidunggioithieu_pagegioithieu{   color: #efa765;
font-size: 1.75rem;
line-height: 1.2em;
font-family: yesevaone; margin-bottom:5rem}

.img_gioithieunhahang{margin-bottom:5rem}
.tieude_lichsuphattrien {color: #efa765;font-size: 3rem; font-family: yesevaone; margin-bottom:2rem;text-align:center}
.noidung_lichsuphattrien,.noidung_lichsuphattrien p{ color: #e0e0e0;line-height: 2rem;} 

.bg_taisaochonchungtoi{  padding:15rem 0;position: relative;
background-size: cover;
background-repeat: no-repeat;
background-position: center;        background-attachment: fixed;}
.bg_taisaochonchungtoi:before { position: absolute; left: 0;top:0; content: ""; width: 100%; height:100%; z-index: 2;  
background-image: linear-gradient(180deg, #00000045 0%, #111424d6 95%);}  

.box_taisaochonchungtoi{ background-color: #232533;padding: 5rem 0; }
.tieude_taisaochonchungtoimain{color: #efa765;font-size: 3rem; font-family: yesevaone; margin-bottom:5rem;text-align:center}

.box_taisaochonchungtoichild{margin-bottom:3rem}
.icon_taisaochonchungtoi{display: block;color: #efa765;font-size:3rem; font-family: yesevaone; margin-bottom:1rem;text-align:center}
.tieude_taisaochonchungtoi{color: #efa765;font-size: 1.375rem;font-family: yesevaone; margin-bottom: 2rem;
text-align: center;height: 50px; overflow: hidden;}
.noidung_taisaochonchungtoi{color: #e0e0e0;line-height: 2rem;}

.box_gallerygioithieu{ background-color: #232533;padding: 5rem 0; }


.gallery-masonry {margin: auto;}

.gallery-item {
width: 25%;
padding: 10px;
box-sizing: border-box;
}

.gallery-item img {
width: 100%;
height: auto;
display: block;
border-radius: 6px;
object-fit: cover;
}

/* Responsive */
@media (max-width: 1199px) {
.gallery-item {
width: 33.3333%;
}
}

@media (max-width: 768px) {
.gallery-item {
width: 50%;
}
}

@media (max-width: 480px) {
.gallery-item {
width: 100%;
}
}


/*X-Large devices (large desktops, 1200px and up)*/
@media (min-width: 1200px) and (max-width: 1600px) { 

}

/*X-Large devices (large desktops, 1600px and up)*/
@media (min-width: 1600px) and (max-width: 2200px){ 

}

/*Extra Extra Large - Desktop*/  
@media (min-width: 2300px) and (max-width: 3000px){

}

/*Extra Extra Large - Desktop*/ 
@media (max-width: 1399.98px){ 
.tieude_pagegioithieu {font-size: 3rem;} 
.box_noidunggioithieu {padding: 3rem 0;}
.noidunggioithieu_pagegioithieu {font-size: 1.3rem;margin-bottom: 2rem;}
.tieude_lichsuphattrien {font-size: 2.1rem;margin-bottom: 1rem;}
.bg_taisaochonchungtoi {padding: 5rem 0;}
.tieude_taisaochonchungtoimain {font-size: 2.1rem;margin-bottom: 3rem;}
.icon_taisaochonchungtoi {font-size: 2rem;}
.tieude_taisaochonchungtoi {font-size: 1.1rem; margin-bottom: 1rem; height: auto;}
.box_taisaochonchungtoi {padding: 5rem 0 0;}
.box_gallerygioithieu {padding: 2rem 0 0;}
}

/*Large Devices (Laptops ≥992px and <1200px)*/
@media (max-width: 1199.98px){ 
.tieude_pagegioithieu {font-size: 3rem;} 
.box_noidunggioithieu {padding: 3rem 0;}
.noidunggioithieu_pagegioithieu {font-size: 1.3rem;margin-bottom: 2rem;}
.tieude_lichsuphattrien {font-size: 2.1rem;margin-bottom: 1rem;}
.bg_taisaochonchungtoi {padding: 5rem 0;}
.tieude_taisaochonchungtoimain {font-size: 2.1rem;margin-bottom: 3rem;}
.icon_taisaochonchungtoi {font-size: 2rem;}
.tieude_taisaochonchungtoi {font-size: 1.1rem; margin-bottom: 1rem; height: auto;}
.box_taisaochonchungtoi {padding: 5rem 0 0;}
.box_gallerygioithieu {padding: 2rem 0 0;}
}

/*Medium Devices (Tablets ≥768px and <992px)*/
@media (max-width: 991.98px){  
.tieude_pagegioithieu {font-size: 2.5rem;}
.bg_headpagegioithieu {padding: 10rem 0 5rem;}
.box_noidunggioithieu {padding: 2rem 0;}
.noidunggioithieu_pagegioithieu {font-size: 1.1rem;margin-bottom: 2rem;}
.tieude_lichsuphattrien {font-size: 2.1rem;margin-bottom: 1rem;}
.bg_taisaochonchungtoi {padding: 5rem 0;}
.tieude_taisaochonchungtoimain {font-size: 2.1rem;margin-bottom: 3rem;}
.icon_taisaochonchungtoi {font-size: 2rem;}
.tieude_taisaochonchungtoi {font-size: 1.1rem; margin-bottom: 1rem; height: auto;}
.box_taisaochonchungtoi {padding: 5rem 0 0;}
.box_gallerygioithieu {padding: 2rem 0 0;}
}

/*Small Devices (Mobiles ≥576px and <768px)*/
@media (max-width: 767.98px){ 
.tieude_pagegioithieu {font-size: 2.5rem;}
.bg_headpagegioithieu {padding: 10rem 0 5rem;}
.box_noidunggioithieu {padding: 2rem 0;}
.noidunggioithieu_pagegioithieu {font-size: 1.1rem;margin-bottom: 2rem;}
.tieude_lichsuphattrien {font-size: 2.1rem;margin-bottom: 1rem;}
.bg_taisaochonchungtoi {padding: 5rem 0;}
.tieude_taisaochonchungtoimain {font-size: 2.1rem;margin-bottom: 3rem;}
.icon_taisaochonchungtoi {font-size: 2rem;}
.tieude_taisaochonchungtoi {font-size: 1.1rem; margin-bottom: 1rem; height: auto;}
.box_taisaochonchungtoi {padding: 5rem 0 0;}
.box_gallerygioithieu {padding: 2rem 0 0;}
}

/*Extra Small Devices (Mobiles <576px)*/
@media (max-width: 575.98px){   
.tieude_pagegioithieu {font-size: 2.5rem;}
.bg_headpagegioithieu {padding: 10rem 0 5rem;}
.box_noidunggioithieu {padding: 2rem 0;}
.noidunggioithieu_pagegioithieu {font-size: 1.1rem;margin-bottom: 2rem;}
.tieude_lichsuphattrien {font-size: 2.1rem;margin-bottom: 1rem;}
.bg_taisaochonchungtoi {padding: 5rem 0;}
.tieude_taisaochonchungtoimain {font-size: 2.1rem;margin-bottom: 3rem;}
.icon_taisaochonchungtoi {font-size: 2rem;}
.tieude_taisaochonchungtoi {font-size: 1.1rem; margin-bottom: 1rem; height: auto;}
.box_taisaochonchungtoi {padding: 5rem 0 0;}
.box_gallerygioithieu {padding: 2rem 0 0;}





}