/* ==================== HEADER ==================== */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--color-background) 88%, transparent);
    border-bottom: 1px solid transparent;
    backdrop-filter: blur(0.9rem);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.header.is-scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: 0 0.4rem 1.4rem rgb(13 40 31 / 5%);
}

.header__inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    min-height: 4.75rem;
    align-items: center;
    gap: var(--space-8);
}

.header__nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
}

.header__link {
    position: relative;
    padding-block: var(--space-2);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: 650;
    transition: color var(--transition-fast);
}

.header__link::after {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 1px;
    background: var(--color-primary);
    content: "";
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-base);
}

.header__link:hover,
.header__link.is-active {
    color: var(--color-text);
}

.header__link:hover::after,
.header__link.is-active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.header__actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
}

.header__mobile-actions,
.mobile-menu {
    display: none;
}

.menu-toggle {
    position: relative;
    z-index: 3;
    pointer-events: auto;
    touch-action: manipulation;
}

.theme-toggle svg {
    transition: transform var(--transition-base);
}

.theme-toggle:hover svg {
    transform: rotate(18deg);
}

@media (max-width: 52rem) {
    .header__inner {
        grid-template-columns: 1fr auto;
        min-height: 4.25rem;
    }

    .header__nav,
    .header__actions {
        display: none;
    }

    .header__mobile-actions {
        position: relative;
        z-index: 3;
        display: flex;
        gap: var(--space-2);
    }

    .header__mobile-actions .icon-button {
        width: 3rem;
        height: 3rem;
    }

    .mobile-menu {
        position: absolute;
        top: 100%;
        right: 0;
        left: 0;
        display: block;
        z-index: 2;
        background: var(--color-background);
        border-top: 1px solid var(--color-border);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-float);
    }

    .mobile-menu__inner {
        display: grid;
        padding-block: var(--space-4) var(--space-5);
    }

    .mobile-menu__link {
        display: flex;
        min-height: 3.25rem;
        align-items: center;
        color: var(--color-text);
        border-bottom: 1px solid var(--color-border);
        font-weight: 650;
    }

    .mobile-menu .button {
        margin-top: var(--space-5);
    }
}

/* ==================== END HEADER ==================== */