.header {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-lg);
}

.logo {
    font-family: var(--font-heading);
    font-size: var(--fs-2xl);
    font-weight: 700;
    color: var(--color-primary);
}

.nav {
    display: flex;
    gap: var(--space-xl);
}

.nav__link {
    font-weight: 500;
    font-size: var(--fs-base);
    position: relative;
    padding: var(--space-sm) 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-primary);
}

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

.burger {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--space-sm);
    z-index: calc(var(--z-sidebar) + 1);
}

.burger span {
    width: 25px;
    height: 3px;
    background-color: var(--color-primary);
    transition: var(--transition-base);
    border-radius: var(--radius-sm);
}

.burger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.burger.active span:nth-child(2) {
    opacity: 0;
}

.burger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}