/* ==========================================================================
   Navigation Component — ColdStorage Canada
   Styles for the fixed top nav bar, desktop dropdowns, hamburger button,
   and full-screen mobile overlay. Mobile-first; desktop styles applied at
   768px and up. All values reference design-system.css custom properties.
   ========================================================================== */


/* ==========================================================================
   Base Bar (mobile-first)
   Fixed-position top bar holding the logo, hamburger, and CTA.
   ========================================================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: var(--color-primary);
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

/* Scrolled state — JS adds .nav-scrolled after 80px of scroll */
.nav.nav-scrolled {
    box-shadow: var(--shadow-md);
}

/* Inner wrapper — constrains width and aligns children horizontally */
.nav-container {
    max-width: var(--max-width);
    height: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-3);
    padding-right: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}


/* ==========================================================================
   Logo
   ========================================================================== */
.nav-logo {
    color: var(--color-white);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    line-height: 1;
    white-space: nowrap;
    transition: opacity var(--transition-base);
}

.nav-logo:hover,
.nav-logo:focus-visible {
    color: var(--color-white);
    opacity: 0.85;
}


/* ==========================================================================
   Desktop Nav Links — hidden on mobile, shown at 768px+
   ========================================================================== */
.nav-links {
    display: none;
}

.nav-item {
    position: relative;
}

.nav-link,
.nav-trigger {
    color: var(--color-white);
    font-family: var(--font-family);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    line-height: 1;
    padding: var(--space-1) var(--space-2);
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    border-radius: var(--radius-sm);
    transition: color var(--transition-base), background-color var(--transition-base);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-trigger:hover,
.nav-trigger:focus-visible {
    color: var(--color-white);
    background-color: var(--color-secondary);
    outline: none;
}

/* Caret indicator for dropdown triggers */
.nav-caret {
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid currentColor;
    display: inline-block;
    transition: transform var(--transition-base);
}

.nav-item-dropdown:hover .nav-caret,
.nav-item-dropdown.is-open .nav-caret {
    transform: rotate(180deg);
}


/* ==========================================================================
   Active Page Indicator
   .nav-active is added by nav.js to the link matching the current path.
   ========================================================================== */
.nav-link.nav-active,
.nav-trigger.nav-active {
    color: var(--color-white);
    box-shadow: inset 0 -2px 0 0 var(--color-accent);
}

.nav-dropdown-link.nav-active {
    color: var(--color-accent);
    background-color: var(--color-neutral-100);
}


/* ==========================================================================
   CTA Button — right aligned on desktop, hidden inside mobile overlay only
   ========================================================================== */
.nav-cta {
    display: none;
    background-color: var(--color-accent);
    color: var(--color-white);
    font-family: var(--font-family);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    line-height: 1;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-base), transform var(--transition-base);
    white-space: nowrap;
}

.nav-cta:hover,
.nav-cta:focus-visible {
    color: var(--color-white);
    background-color: var(--color-secondary);
    outline: none;
}


/* ==========================================================================
   Hamburger Button — visible on mobile only
   ========================================================================== */
.nav-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-base);
}

.nav-hamburger:hover,
.nav-hamburger:focus-visible {
    background-color: var(--color-secondary);
    outline: none;
}

.nav-hamburger-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-white);
    border-radius: var(--radius-full);
}


/* ==========================================================================
   Mobile Overlay — full-screen menu opened by the hamburger
   Hidden by default; .is-open toggled by JS.
   ========================================================================== */
.nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-primary);
    z-index: 1100;
    overflow-y: auto;
    padding: var(--space-3);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    visibility: hidden;
}

.nav-overlay.is-open {
    transform: translateX(0);
    visibility: visible;
}

/* Header row inside overlay */
.nav-overlay-header {
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-3);
}

.nav-overlay-logo {
    color: var(--color-white);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    line-height: 1;
}

.nav-overlay-close {
    width: 40px;
    height: 40px;
    color: var(--color-white);
    font-size: var(--text-3xl);
    font-weight: var(--font-regular);
    line-height: 1;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-base);
}

.nav-overlay-close:hover,
.nav-overlay-close:focus-visible {
    background-color: var(--color-secondary);
    outline: none;
}

/* Overlay link list */
.nav-overlay-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.nav-overlay-item {
    border-bottom: 1px solid var(--color-secondary);
}

.nav-overlay-link,
.nav-overlay-trigger {
    width: 100%;
    color: var(--color-white);
    font-family: var(--font-family);
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    line-height: 1;
    padding: var(--space-2) var(--space-1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    transition: color var(--transition-base);
}

.nav-overlay-link:hover,
.nav-overlay-link:focus-visible,
.nav-overlay-trigger:hover,
.nav-overlay-trigger:focus-visible {
    color: var(--color-accent);
    outline: none;
}

.nav-overlay-link.nav-active,
.nav-overlay-trigger.nav-active {
    color: var(--color-accent);
}

/* Accordion sublinks — collapsed by default; expand when parent .is-open */
.nav-overlay-sublinks {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.nav-overlay-item-accordion.is-open .nav-overlay-sublinks {
    max-height: 600px;
}

.nav-overlay-item-accordion.is-open .nav-caret {
    transform: rotate(180deg);
}

.nav-overlay-sublink {
    display: block;
    color: var(--color-white);
    font-family: var(--font-family);
    font-size: var(--text-base);
    font-weight: var(--font-regular);
    line-height: var(--leading-normal);
    padding: var(--space-1) var(--space-3);
    transition: color var(--transition-base);
}

.nav-overlay-sublink:hover,
.nav-overlay-sublink:focus-visible {
    color: var(--color-accent);
    outline: none;
}

.nav-overlay-sublink.nav-active {
    color: var(--color-accent);
    font-weight: var(--font-semibold);
}

/* CTA inside overlay */
.nav-overlay-cta {
    display: block;
    background-color: var(--color-accent);
    color: var(--color-white);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    line-height: 1;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    text-align: center;
    margin-top: var(--space-3);
    transition: background-color var(--transition-base);
}

.nav-overlay-cta:hover,
.nav-overlay-cta:focus-visible {
    color: var(--color-white);
    background-color: var(--color-secondary);
    outline: none;
}


/* ==========================================================================
   Body Scroll Lock — applied by JS when overlay is open
   ========================================================================== */
body.nav-no-scroll {
    overflow: hidden;
}


/* ==========================================================================
   Focus Visibility — ensures keyboard users see focus rings everywhere
   ========================================================================== */
.nav a:focus-visible,
.nav button:focus-visible,
.nav-overlay a:focus-visible,
.nav-overlay button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}


/* ==========================================================================
   Tablet & Desktop (768px and up)
   Show desktop links + CTA, hide hamburger and overlay.
   ========================================================================== */
@media (min-width: 768px) {

    .nav-container {
        padding-left: var(--space-6);
        padding-right: var(--space-6);
    }

    /* Show desktop nav links */
    .nav-links {
        display: flex;
        align-items: center;
        gap: var(--space-1);
        margin-left: auto;
        margin-right: var(--space-3);
    }

    /* Show desktop CTA */
    .nav-cta {
        display: inline-flex;
        align-items: center;
    }

    /* Hide hamburger */
    .nav-hamburger {
        display: none;
    }

    /* Hide overlay completely on desktop, even if .is-open class lingers */
    .nav-overlay {
        display: none;
    }

    /* Dropdown panel — appears below trigger */
    .nav-dropdown {
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 240px;
        background-color: var(--color-white);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-lg);
        padding: var(--space-1);
        margin-top: var(--space-1);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-4px);
        transition:
            opacity var(--transition-base),
            visibility var(--transition-base),
            transform var(--transition-base);
        z-index: 10;
    }

    /* Show on hover or when JS adds .is-open (keyboard / focus support) */
    .nav-item-dropdown:hover .nav-dropdown,
    .nav-item-dropdown:focus-within .nav-dropdown,
    .nav-item-dropdown.is-open .nav-dropdown {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    /* Right-edge protection — flips the panel to align right when needed */
    .nav-item-dropdown.nav-dropdown-right .nav-dropdown {
        left: auto;
        right: 0;
    }

    /* Dropdown links */
    .nav-dropdown-link {
        display: block;
        color: var(--color-neutral-900);
        font-family: var(--font-family);
        font-size: var(--text-sm);
        font-weight: var(--font-medium);
        line-height: var(--leading-normal);
        padding: var(--space-1) var(--space-2);
        border-radius: var(--radius-sm);
        white-space: nowrap;
        transition: background-color var(--transition-base), color var(--transition-base);
    }

    .nav-dropdown-link:hover,
    .nav-dropdown-link:focus-visible {
        background-color: var(--color-neutral-100);
        color: var(--color-accent);
        outline: none;
    }
}


/* ==========================================================================
   Larger desktop (1024px+) — wider container padding
   ========================================================================== */
@media (min-width: 1024px) {

    .nav-container {
        padding-left: var(--space-10);
        padding-right: var(--space-10);
    }

    .nav-links {
        gap: var(--space-2);
    }
}

/* End of file */