.nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-neutral-100);
    z-index: 999;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.nav--open {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.nav__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nav__link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-heading);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
    color: var(--color-neutral-700);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-neutral-100);
    background-color: var(--color-secondary);
}

.nav__link--active {
    font-weight: var(--font-weight-bold);
}

.nav__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.nav__toggle:hover {
    background-color: var(--color-neutral-200);
}

.nav__toggle-icon {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 24px;
}

.nav__toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-neutral-800);
    border-radius: 2px;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav__toggle--open .nav__toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav__toggle--open .nav__toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav__toggle--open .nav__toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav__submenu {
    display: none;
    padding-left: var(--spacing-md);
}

.nav__item--open > .nav__submenu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

@media (min-width: 1024px) {
    .nav {
        display: flex;
        position: static;
        background: none;
        padding: 0;
        overflow: visible;
        align-self: stretch;
        height: 100%;
    }

    .nav__list {
        flex-direction: row;
        align-items: stretch;
        gap: 0;
        height: 100%;
    }

    .nav__link {
        font-size: var(--font-size-sm);
        padding: 0 20px;
        display: flex;
        align-items: center;
        height: 100%;
        border-radius: 0;
    }

    .nav__toggle {
        display: none;
    }

    .nav__item {
        position: relative;
        display: flex;
        align-items: stretch;
        height: 100%;
    }

    /* Chevron indicators for submenu links on desktop */
    .nav__item:has(.nav__submenu) > .nav__link {
        display: flex;
        align-items: center;
        gap: 6px;
    }

    .nav__item:has(.nav__submenu) > .nav__link::after {
        content: '';
        display: inline-block;
        width: 5px;
        height: 5px;
        border-right: 1.5px solid currentColor;
        border-bottom: 1.5px solid currentColor;
        transform: rotate(45deg);
        transition: transform var(--transition-fast) ease;
        margin-top: -2px;
    }

    .nav__item:has(.nav__submenu):hover > .nav__link::after {
        transform: rotate(-135deg);
        margin-top: 2px;
    }

    /* Premium B2B Dropdown with smooth deployment animation */
    .nav__submenu {
        display: flex !important; /* Force flex on desktop to allow opacity/transform transitions */
        flex-direction: column; /* Align options vertically (one on top of the other) */
        gap: var(--spacing-xs); /* Add vertical gap between options */
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 240px;
        background-color: var(--color-neutral-100);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.02);
        border: 1px solid var(--color-neutral-300);
        border-top: 3px solid var(--color-primary); /* B2B accent brand border */
        border-radius: 0 0 var(--radius-md) var(--radius-md); /* rounded bottom corners */
        padding: var(--spacing-xs) 0;
        
        /* Smooth deployment animation settings */
        opacity: 0;
        visibility: hidden;
        transform: translateY(12px);
        transition: opacity var(--transition-normal) ease,
                    transform var(--transition-normal) ease,
                    visibility var(--transition-normal) ease;
        z-index: 100;
        padding-left: 0; /* reset mobile padding */
    }

    .nav__submenu li {
        width: 100%;
    }

    .nav__item:hover > .nav__submenu,
    .nav__item--open > .nav__submenu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav__submenu .nav__link {
        font-size: var(--font-size-sm);
        padding: 10px var(--spacing-md);
        border-radius: 0;
        color: var(--color-neutral-700);
        background-color: transparent;
        transition: background-color var(--transition-fast) ease, 
                    color var(--transition-fast) ease, 
                    padding-left var(--transition-fast) ease;
    }

    .nav__submenu .nav__link:hover {
        color: var(--color-neutral-100);
        background-color: var(--color-secondary);
        padding-left: calc(var(--spacing-md) + 4px); /* smooth side-shift on hover */
    }
}