/* Header / Navbar */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 15, 28, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem 0;
}

body.light-theme .header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--color-border-light);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: white;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: opacity 0.3s ease;
}

.logo:hover {
    opacity: 0.85;
}

.logo-img {
    height: 45px;
    width: auto;
    display: block;
    transition: transform 0.3s ease;
}

.logo:hover .logo-img {
    transform: scale(1.02);
}

.logo span {
    color: var(--color-primary);
}

body.light-theme .logo {
    color: var(--color-text-dark);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: white;
}

body.light-theme .mobile-toggle {
    color: var(--color-text-dark);
}

/* Footer */
.footer {
    background-color: var(--color-bg-darker);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-col h4 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.footer-col ul li a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.8rem;
}

/* Grid System for Cards */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        /* TODO: Implement mobile menu JS */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--color-bg-dark);
        flex-direction: column;
        padding: 1rem;
        text-align: center;
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-toggle {
        display: block;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 2rem;
    }

    /* Logo responsive */
    .logo-img {
        height: 38px;
    }
}