/* --- Header / Navbar --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: rgba(7, 9, 14, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
}

header.scrolled {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    background: rgba(7, 9, 14, 0.95);
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 50px;
}

.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--primary);
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    color: var(--text-title);
    cursor: pointer;
    background: none;
    border: none;
}

/* --- Responsividade Header --- */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-surface);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: var(--transition);
    }
    
    .nav-links.active { 
        left: 0; 
    }
    
    .mobile-menu-btn { 
        display: block; 
    }
}