/**
 * Navigation Components
 * 
 * Unified navigation styles following design system tokens
 * BEM naming convention for maintainability
 */

/* Navigation Base */
.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

/* Navigation List */
.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav__list--vertical {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-2);
}

/* Navigation Item */
.nav__item {
    display: flex;
    align-items: center;
}

/* Navigation Link */
.nav__link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--border-radius-base);
    transition: var(--transition-base);
    position: relative;
}

.nav__link:hover {
    background: var(--color-gray-100);
    color: var(--color-primary-dark);
}

.nav__link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.nav__link--active {
    color: var(--color-primary-dark);
    background: var(--color-gray-50);
    font-weight: var(--font-weight-semibold);
}

.nav__link--active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--spacing-4);
    right: var(--spacing-4);
    height: 2px;
    background: var(--color-primary);
}

/* Breadcrumbs */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-family: var(--font-family-base);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin: var(--spacing-4) 0;
}

.breadcrumbs__item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.breadcrumbs__link {
    color: var(--color-text-light);
    text-decoration: none;
    transition: var(--transition-fast);
}

.breadcrumbs__link:hover {
    color: var(--color-primary-dark);
}

.breadcrumbs__link--current {
    color: var(--color-text);
    font-weight: var(--font-weight-medium);
    pointer-events: none;
}

.breadcrumbs__separator {
    color: var(--color-border);
}

/* Header Navigation */
.header-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) 0;
    gap: var(--spacing-6);
}

/* Footer Navigation */
.footer-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-8);
    padding: var(--spacing-8) 0;
}

.footer-nav__section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.footer-nav__title {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin: 0 0 var(--spacing-2) 0;
}

.footer-nav__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-nav__link {
    font-family: var(--font-family-base);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-nav__link:hover {
    color: var(--color-primary-dark);
    padding-left: var(--spacing-1);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-2);
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: var(--z-index-dropdown);
}

.nav-toggle__line {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition-base);
}

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

.nav-toggle--active .nav-toggle__line:nth-child(2) {
    opacity: 0;
}

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

/* Mobile Navigation Styles */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav__list {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-light);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-8) var(--spacing-4);
        gap: var(--spacing-2);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        z-index: var(--z-index-dropdown);
        box-shadow: var(--shadow-xl);
    }
    
    .nav__list--open {
        transform: translateX(0);
    }
    
    .nav__link {
        width: 100%;
        padding: var(--spacing-3) var(--spacing-4);
    }
    
    .footer-nav {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .nav__link,
    .breadcrumbs__link,
    .footer-nav__link,
    .nav-toggle__line,
    .nav__list {
        transition: none;
    }
    
    .nav__link:hover,
    .footer-nav__link:hover {
        padding-left: 0;
    }
}