@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

html{
    scroll-behavior: smooth;
 }
body, h1, h2, h3, p, ul, li, a {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
 
body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: #333;
    
}

/*upper nav*/
.navbar-div1 {
    
    background-color: rgb(0, 0, 99);
    padding: 10px;
    text-align: center;
    color: white;
    display: flex;
    justify-content: center;
    height: 70px;
    
}
.navbar-div1 img{
    height: 30px;
    width: 140px;
    object-fit: contain;
    
}
.mobile-div1{
    display: none;
}
/*div3*/

header {
    
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    transition: background 0.4s ease;
}

header nav {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 7px 30px;
}

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

/* Specific styling for the Certificates menu item */
#certificates a {
    color: cyan; /* Change text color to cyan */ 
}

#certificates a:hover {
    color: darkcyan;  /* Change color on hover for a visual effect */
}

header nav .nav-items {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

header nav .nav-items li {
    margin: 0 15px;
}

header nav .nav-items li a {
    font-size: 18px;
    padding: 5px;
    text-decoration: none;
    color: #fff;
    font-weight: 500;
    transition: color 0.3s ease;
}



header nav .nav-items li a:hover {
    color: #ADD8E6;
}
 
header nav .logo {
    margin: 0 30px;
}

header nav .logo img {
    height: 35px;
    margin-top: 5px;
}

 
header.transparent {
    background: rgba(255, 255, 255, 0);
}

 
header.scrolled {
    background: rgb(0, 65, 131);
}

 
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    background-color: white;
    height: 3px;
    width: 25px;
    margin: 2px 0;
    transition: all 0.3s ease;
}

 
.mobile-only {
    display: none; 
}
/* div 2 */
.top-bar {
    
    
    background-color: transparent; 
    padding: 5px 20px;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    gap: 430px;
    height: 40px;
}

.top-bar img {
    width: 120px;

}

.top-bar img {
    filter: brightness(0) invert(1);
}

header.scrolled nav {
    background-color: rgb(0, 65, 131); 
}

.top-bar.scrolled {
    background-color: rgb(0, 65, 131); 
}

.top-bar.scrolled img {
    filter: brightness(0) invert(1);
}

.div1 {
    background-color: #001f3f;  
    padding: 2px 10px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding-left: 150px;
}

.div1 ul {
    display: flex;
    
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 10px;
}

.div1 li a {
    color: white;
    font-size: 12px;
    text-decoration: none;
    padding: 2px 5px;
    transition: color 0.3s ease;
}

.div1 li a:hover {
    color: #00ffff; 
}
.ieee{
    padding-left: 200px;
  
}
.sb{
    right: 200px;
    
}
/* for navbar of div 1 and 2 */
@media (max-width: 768px) {
    .mobile-div1{
        line-height: 15px;
    }
    .div1 {
        display: none;
    }
    .header{
        transition: transform 0.3s ease-in-out;
        z-index: 1000;
    }
    .header.hidden{
        transform: translateY(-100%);
    }

    .div1 ul {
        flex-wrap: wrap;
        gap: 6px;
    }

    .div1 li a {
        font-size: 11px;
        padding: 1px 3px;
    }
    .mobile-div1{
        display: block;
        text-align: center;
    }

    .top-bar{
        width: 300px;
        display: flex;
        justify-content:center;
        align-items: center;
        gap: 60px;
        padding-left: 30px;
    }
    .ieee{
        
        padding-left: 0px;
        
        
    }

    
}



 
@media (max-width: 768px) {

.mobile-only {
        display: block; 
    }

    header nav {
        justify-content: space-between;
        padding: 20px;
    }

    header nav .nav-items {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(0, 51, 102, 0.9);
        padding: 20px 0;
        z-index: 999;
    }

    header nav .nav-items.active {
        display: flex;
    }

    header nav .nav-items li {
        margin: 10px 0;
    }

    .hamburger {
        display: flex;
    }
 
    header nav .right-menu {
        display: none;
    }

     
    header nav .left-menu.active,
    header nav .right-menu.active {
        display: flex;
    }
}