header {
    position: fixed;
    width: 100%;
    background-color: #0a192f;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    color: #64ffda;
}

.nav-links {
    list-style: none;
    display: flex;
}

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #64ffda;
}

.nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #0a192f;
    padding: 1rem 0;
}

.nav-links.active li {
    margin: 0;
    text-align: center;
}

.nav-links.active a {
    padding: 1rem;
    display: block;
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: #fff;
    margin: 3px 0;
    transition: 0.3s;
}

#hero {
    height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding-top: 80px; /* Account for fixed header */
}

#about {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--tertiary-color) 100%);
}

#skills {
    background: linear-gradient(135deg, var(--tertiary-color) 0%, var(--quaternary-color) 100%);
}

#associative {
    background: linear-gradient(135deg, var(--quaternary-color) 0%, var(--tertiary-color) 100%);
}

#projects {
    background: linear-gradient(135deg, var(--tertiary-color) 0%, var(--secondary-color) 100%);
}

#contact {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

footer {
    background-color: #0a192f;
    text-align: center;
    padding: 2rem;
    border-top: 1px solid #1a365d;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
    }

    .logo {
        font-size: 1.2rem;
    }

    #hero {
        padding-top: 80px;
    }

    footer {
        padding: 1.5rem 1rem;
        text-align: center;
    }
}