.header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-sticky);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    padding: var(--space-sm) 0;
}

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

.logo {
    display: block;
}

.logo img {
    height: 50px;
    width: auto;
    transition: transform 0.3s ease;
}

.logo:hover img {
    transform: scale(1.05);
}

.nav-list {
    display: flex;
    list-style-type: none;
    gap: var(--space-xl);
}

.nav-list a {
    color: var(--neutral-800);
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    position: relative;
}

.nav-list a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.nav-list a:hover {
    color: var(--primary-600);
}

.nav-list a:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px 0;
    background-color: var(--neutral-800);
    transition: all 0.3s ease;
}

/* Scrolled state */
.header.scrolled {
    background-color: white;
    box-shadow: var(--shadow-md);
    padding: var(--space-xs) 0;
}

/* Mobile nav */
@media (max-width: 768px) {
    .nav-list {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: white;
        box-shadow: var(--shadow-md);
        padding: var(--space-lg);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
        z-index: var(--z-dropdown);
        gap: var(--space-lg);
        align-items: center;
    }
    
    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }
}