*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:'Poppins', sans-serif;
}

body{
background:#f4f6f9;
color:#333;
}

/* HEADER */
.main-header{
background:linear-gradient(135deg,#0f2027,#203a43,#2c5364);
padding:15px 10px;
color:white;
}

.header-container{
display:flex;
align-items:center;
justify-content:space-between;
max-width:1200px;
margin:auto;
}

.header-img img{
width:90px;
border-radius:10px;
}

.header-title{
text-align:center;
flex:1;
}

.header-title h1{
font-size:28px;
}

.header-title p{
font-size:14px;
}

/* NAV */
nav{
background:#111;
}

nav ul{
list-style:none;
display:flex;
justify-content:center;
}

nav ul li{
position:relative;
}

nav ul li a{
display:block;
padding:10px 15px;
color:white;
text-decoration:none;
}

nav ul li a:hover{
background:#00b894;
}

/* DROPDOWN */
.submenu{
display:none;
position:absolute;
background:#222;
min-width:180px;
z-index:999;
}

.dropdown:hover .submenu{
display:block;
}

.submenu li a{
padding:8px 12px;
}

/* ANNOUNCEMENT */
.announcement-bar{
background:#ff4b2b;
color:white;
padding:10px;
text-align:center;
}

/* LAYOUT */
.container{
display:grid;
grid-template-columns:1fr 2fr 1fr;
gap:20px;
padding:20px;
max-width:1200px;
margin:auto;
}

.card{
background:white;
padding:15px;
border-radius:10px;
box-shadow:0 4px 10px rgba(0,0,0,0.1);
}

.card h3{
border-bottom:2px solid #00b894;
margin-bottom:10px;
}

/* GALLERY */
.gallery{
width:100%;
aspect-ratio:16/9;
position:relative;
overflow:hidden;
}

.gallery img,
.gallery video{
position:absolute;
width:100%;
height:100%;
object-fit:cover;
display:none;
}

/* NOTICE */
.notice-list{
list-style:none;
}

.notice-list li{
margin-bottom:10px;
}

/* FOOTER */
footer{
background:#000;
color:white;
text-align:center;
padding:15px;
}

/* MOBILE */
@media(max-width:900px){
.container{
grid-template-columns:1fr;
}
}