/* Footer */
footer {
    background-color: var(--blue-main);
    padding: 2rem 1rem 1.5rem;
    margin-top: 3rem;
}

.footer {
    max-width: 72rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    color: var(--gray-300);
}

.footer-brand {
    max-width: 360px;
}

.footer-logo {
    font-family: 'Fira Code', monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--electric-blue);
    text-decoration: none;
    display: inline-block;
    margin-bottom: 0.75rem;
}

.footer-columns {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-heading {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--gray-400);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.footer-links a {
    color: var(--gray-300);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--electric-blue);
}

.footer-bottom {
    border-top: 1px solid var(--border-gray);
    padding-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    color: var(--gray-500, #6b7280);
    font-size: 0.85rem;
}

.footer-back-to-top {
    align-self: flex-start;
    color: var(--gray-300);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: color 0.2s ease;
}

.footer-back-to-top:hover {
    color: var(--electric-blue);
}

/* Responsive */
@media (min-width: 480px) {
    footer {
        padding: 2.5rem 1.25rem 1.75rem;
        margin-top: 3.5rem;
    }
    
    .footer-logo {
        font-size: 1.375rem;
    }
}

@media (min-width: 640px) {
    footer {
        padding: 3rem 1.5rem 2rem;
        margin-top: 4rem;
    }
    
    .footer-logo {
        font-size: 1.5rem;
    }
    
    .footer-columns {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .footer-inner {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
    }

    .footer-columns {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 2rem;
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

@media (min-width: 1024px) {
    .footer-columns {
        gap: 2.5rem;
    }
}