/* ============================================
   BOTTELIGENCE DESIGN SYSTEM - NAVIGATION
   ============================================ */

/* HEADER & NAVIGATION */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
    transition: box-shadow var(--transition-base);
}

@media (prefers-color-scheme: dark) {
    .site-header {
        background-color: rgba(32, 33, 36, 0.95);
    }
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: var(--space-6);
}

/* LOGO */
.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.nav-logo:hover {
    opacity: 0.8;
}

.nav-logo:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--border-radius-sm);
}

/* NAVIGATION LINKS */
.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
}

.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
}

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

/* CTA BUTTON IN NAV */
.nav-cta {
    display: inline-flex;
    align-items: center;
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: white;
    background-color: var(--color-primary);
    border-radius: var(--border-radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.nav-cta:hover {
    background-color: var(--color-primary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

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

.nav-cta:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

/* MOBILE MENU TOGGLE */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    position: relative;
    z-index: 1001;
}

.mobile-menu-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--border-radius-sm);
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-base);
    position: absolute;
}

.mobile-menu-toggle span:nth-child(1) {
    top: 12px;
}

.mobile-menu-toggle span:nth-child(2) {
    top: 19px;
}

.mobile-menu-toggle span:nth-child(3) {
    top: 26px;
}

/* Mobile menu checkbox (hidden) */
#mobile-menu-checkbox {
    display: none;
}

/* Mobile menu open state (CSS-only toggle) */
#mobile-menu-checkbox:checked~.nav-container .mobile-menu-toggle span:nth-child(1) {
    transform: rotate(45deg);
    top: 19px;
}

#mobile-menu-checkbox:checked~.nav-container .mobile-menu-toggle span:nth-child(2) {
    opacity: 0;
}

#mobile-menu-checkbox:checked~.nav-container .mobile-menu-toggle span:nth-child(3) {
    transform: rotate(-45deg);
    top: 19px;
}

/* RESPONSIVE BEHAVIOR */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background-color: var(--color-surface);
        border-bottom: 1px solid var(--color-border-light);
        box-shadow: var(--shadow-lg);
        padding: var(--space-4);
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition: all var(--transition-base);
    }

    #mobile-menu-checkbox:checked~.nav-container .nav-links {
        max-height: 500px;
        opacity: 1;
        padding: var(--space-5) var(--space-4);
    }

    .nav-link {
        width: 100%;
        padding: var(--space-4);
        justify-content: flex-start;
    }

    .nav-cta {
        width: 100%;
        justify-content: center;
        margin-top: var(--space-4);
    }

    .nav-container {
        height: 64px;
    }
}

/* TABLET ADJUSTMENTS */
@media (min-width: 769px) and (max-width: 1024px) {
    .nav-links {
        gap: var(--space-1);
    }

    .nav-link {
        padding: var(--space-2) var(--space-3);
        font-size: var(--font-size-sm);
    }

    .nav-cta {
        padding: var(--space-2) var(--space-4);
        font-size: var(--font-size-sm);
    }
}

/* DESKTOP LARGE */
@media (min-width: 1200px) {
    .nav-links {
        gap: var(--space-3);
    }

    .nav-link {
        padding: var(--space-3) var(--space-5);
    }
}

/* ACCESSIBILITY - SKIP TO CONTENT */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 0;
    background-color: var(--color-primary);
    color: white;
    padding: var(--space-3) var(--space-5);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    z-index: 2000;
    transition: top var(--transition-fast);
}

.skip-to-content:focus {
    top: var(--space-4);
    left: var(--space-4);
    outline: 2px solid white;
    outline-offset: 2px;
}

/* NAVIGATION ANIMATIONS */
@media (prefers-reduced-motion: no-preference) {
    .nav-link::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        width: 0;
        height: 2px;
        background-color: var(--color-primary);
        transition: all var(--transition-base);
        transform: translateX(-50%);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
        width: calc(100% - var(--space-4) * 2);
    }
}

/* Disable animations for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {

    .site-header,
    .nav-link,
    .nav-cta,
    .mobile-menu-toggle span,
    .nav-links {
        transition: none;
    }
}