header {
    height: 50px; 
    background-color: var(--bg-color);
    padding: 10px 20px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}


header .logo {
    font-weight: bold;
    font-size: 1.2rem;
}


header nav {
    flex: 1;
    display: flex;
    justify-content: center;
    gap: 20px;
    transition: transform 0.3s ease;
}


.burger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 25px;
    height: 18px;
    cursor: pointer;
}
.burger span {
    height: 3px;
    background: var(--burger-color);
    border-radius: 2px;
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    header nav {
        position: absolute;
        top: 50px;
        left: 0;
        right: 0;
        background: var(--bg-color);
        flex-direction: column;
        align-items: center;
        gap: 15px;
        padding: 20px 0;
        transform: translateY(-200%);
    }

    header nav.active {
        transform: translateY(0);
    }

    .burger {
        display: flex;
        margin-left: auto;
    }
}


.burger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.burger.active span:nth-child(2) {
    opacity: 0;
}
.burger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}