/* Header Styles */
:root {
    --header-bg: #1a365d;
    --header-scrolled: rgba(26, 54, 93, 0.9);
    --text-light: #ffffff;
}

header {
    background-color: var(--header-bg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    height: 50px;
}

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

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #3b82f6;
}

.mobile-menu {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
}

/* Header scroll effect */
header.scrolled {
    background-color: var(--header-scrolled);
    backdrop-filter: blur(5px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-container {
        padding: 15px 0;
    }
    
    nav {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 80%;
        height: calc(100vh - 80px);
        background-color: var(--header-bg);
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        transition: left 0.3s;
    }
    
    nav.active {
        left: 0;
    }
    
    nav ul {
        flex-direction: column;
        padding: 20px;
    }
    
    nav ul li {
        margin: 15px 0;
    }
    
    .mobile-menu {
        display: block;
    }
}