/* Header & Navigation */
.nav-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 2000;
    padding: 40px 0;
    transition: padding 0.6s var(--transition-base), background 0.6s var(--transition-base);
}

.nav-header.scrolled {
    padding: 20px 0;
    background: rgba(5, 5, 5, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 300;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    z-index: 2100;
}

.nav-links {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-link {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color 0.4s var(--transition-base);
    position: relative;
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width 0.4s var(--transition-base);
}

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

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

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

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    z-index: 2100;
    cursor: pointer;
}

.mobile-toggle span {
    width: 24px;
    height: 1px;
    background: var(--text-primary);
    transition: transform 0.4s var(--transition-base), opacity 0.4s var(--transition-base);
}

/* Footer */
.main-footer {
    padding: 120px 0 60px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 80px;
    margin-bottom: 100px;
}

.footer-brand p {
    margin-top: 24px;
    color: var(--text-secondary);
    max-width: 320px;
    font-size: 0.95rem;
    line-height: 1.6;
}

.footer-heading {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    margin-bottom: 32px;
    letter-spacing: 0.1em;
}

.footer-links li {
    margin-bottom: 16px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    padding-top: 60px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.footer-contact-link {
    color: var(--text-primary);
    font-weight: 500;
}

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr;
        gap: 60px;
    }
}

@media (max-width: 768px) {
    .nav-header {
        padding: 30px 0;
    }
    .mobile-toggle {
        display: flex;
    }
    .nav-links {
        position: fixed;
        inset: 0;
        width: 100%;
        height: 100vh;
        background: var(--bg-primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity 0.35s ease, visibility 0.35s ease;
        z-index: 2000;
        display: flex;
    }
    .nav-links.active {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
    .footer-brand {
        grid-column: span 2;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .footer-brand {
        grid-column: span 1;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
}