/* Header and Navigation */
header {
    background: rgba(0, 0, 0, 0.7);
    position: fixed;
    width: 100%;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    color: var(--text-light);
    font-size: var(--font-size-xl);
}

nav {
    position: relative;
}

/* Base Navigation Styles */
.nav-links {
    list-style: none;
    display: flex;
}

.nav-links li {
    margin-left: var(--spacing-lg);
    width: 80%;
    text-align: center;
    padding: var(--spacing-sm) 0;
}

.nav-links li:last-child {
    border-bottom: none;
}

.nav-links a {
    color: var(--text-light);
    font-weight: bold;
    position: relative;
    transition: var(--transition-base);
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--text-light);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a:focus::after {
    width: 100%;
}

.nav-active {
    display: flex;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Footer */
footer {
    background: var(--background-dark);
    color: var(--text-light);
}

.footer-columns {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.footer-column {
    flex: 1;
    margin: var(--spacing-md);
}

.footer-column ul li a {
    color: var(--text-light);
}

.footer-bottom {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* Social Icons */
.social-icons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.social-icons a {
    color: var(--primary-color);
    font-size: var(--font-size-xl);
    transition: var(--transition-base);
}

/* Hamburger Menu Styles */
.hamburger {
    display: none;
    cursor: pointer;
    padding: 10px;
    transition: transform 0.3s ease;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-light);
    margin: 5px 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.open {
    transform: rotate(90deg);
}

.hamburger.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
    opacity: 0;
}

.hamburger.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Navigation Styles */
@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 81px; /* Adjust based on your header height */
        left: 0;
        width: 100%;
        height: calc(60vh - 81px);
        background-color: var(--background-dark);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: var(--spacing-sm);
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
    }

    .nav-links.nav-active {
        transform: translateX(0);
    }

    .nav-links li {
        margin: var(--spacing-md) 0;
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.3s ease, transform 0.3s ease;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-links.nav-active li {
        opacity: 1;
        transform: translateY(0);
        transition-delay: calc(0.1s * var(--item-index));
    }

    .nav-links a {
        font-size: var(--font-size-lg);
        transition: color 0.3s ease, transform 0.3s ease;
    }

    .nav-links a:hover, .nav-links a:focus {
        color: var(--primary-color);
        transform: scale(1.05);
    }

    /* Hamburger Animation */
    .hamburger.open span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.open span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.open span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
}