/**
 * css/core/nav.css
 * =================
 * Navigation -- the SINGLE SOURCE OF TRUTH for all nav styling.
 * Engine-level -- identical on every page, every brand.
 * Brand colours come via var(--theme-*) tokens set by the theme file.
 *
 * DO NOT override these rules in page CSS or inline styles.
 * To change nav appearance for a brand, override --theme-* tokens in the theme file.
 */

/* -- Nav bar --------------------------------------------------------------- */

.nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    background: #FFFFFF;
    border-bottom: 3px solid var(--theme-primary);
    box-shadow: var(--shadow-sm, 0 2px 6px rgba(0, 0, 0, 0.08));
    padding: 0.5rem 0;
    /* Prevent height jitter on scroll */
    min-height: var(--nav-height, 72px);
    height: auto;
    will-change: auto;
    contain: none;
    transition: none;
}

/* -- Nav inner layout ------------------------------------------------------ */

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* -- Logo ------------------------------------------------------------------ */

.nav .logo-link {
    position: static;
    transform: none;
    text-decoration: none;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.logo-placeholder img,
.site-logo {
    height: 60px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
    display: block;
}

/* -- Nav menu -------------------------------------------------------------- */

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--nav-link-gap, 0.25rem);
    list-style: none;
    flex-wrap: nowrap;
}

/* Suppress classic-variant spacer -- not used in engine nav */
.nav-spacer {
    display: none !important;
}

/* -- Nav links ------------------------------------------------------------- */

.nav-link {
    color: var(--theme-text);
    font-weight: 600;
    font-family: var(--theme-font-display);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 0.95rem;
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-link:hover {
    color: var(--theme-primary);
    background-color: color-mix(in srgb, var(--theme-primary) 8%, transparent);
}

.nav-link.active {
    color: var(--theme-primary);
    background-color: color-mix(in srgb, var(--theme-primary) 12%, transparent);
}

/* Keep the active-state handoff from flashing during first render */
html.nav-loading .nav,
html.nav-loading .nav *,
html.nav-loading .nav-link,
body.nav-loading .nav,
body.nav-loading .nav *,
body.nav-loading .nav-link {
    transition: none !important;
}

/* Fallback for browsers without color-mix */
@supports not (color: color-mix(in srgb, red, blue)) {
    .nav-link:hover  { background-color: rgba(0, 0, 0, 0.06); }
    .nav-link.active { background-color: rgba(0, 0, 0, 0.10); }
}

/* -- Cart button ----------------------------------------------------------- */

.cart-button {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--theme-primary);
    color: #FFFFFF;
    border: none;
    border-radius: var(--radius-sm, 6px);
    padding: 0.4rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.cart-button:hover {
    background: var(--theme-primary-hover);
}

.cart-button-label {
    line-height: 1;
}

#cart-badge {
    background: var(--theme-secondary);
    color: #1A1A1A;
    border-radius: 999px;
    padding: 0 0.4rem;
    font-size: 0.75rem;
    font-weight: 700;
    min-width: 1.25rem;
    text-align: center;
    line-height: 1.4;
}

@media (max-width: 1200px) {
    .cart-button-label {
        display: none;
    }
}

/* -- Mobile toggle --------------------------------------------------------- */

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--theme-text);
    padding: 0.25rem;
    line-height: 1;
    flex-shrink: 0;
}

/* -- Mobile breakpoint ----------------------------------------------------- */

@media (max-width: 900px) {
    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        align-items: stretch;
        padding: 0.5rem 0;
        border-top: 2px solid var(--theme-primary);
        box-shadow: var(--shadow-md, 0 4px 16px rgba(0, 0, 0, 0.10));
        z-index: 100;
        transform: none;
    }

    .nav-menu.is-open {
        display: flex;
    }

    .nav-link {
        padding: 0.75rem 1.5rem;
        border-radius: 0;
        font-size: 1rem;
    }

    .cart-button {
        margin: 0.5rem 1.5rem;
        align-self: flex-start;
    }

    .cart-button-label {
        display: inline;
    }
}