/* ===== LEARN SECTION SIDEBAR STYLES ===== */
/* Shared styles for all Learn section pages with expandable navigation */

/* Layout */
.learn-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    min-height: 100vh;
    padding-top: 70px;
}

/* ===== LEFT SIDEBAR ===== */
.learn-sidebar {
    position: sticky;
    top: 70px;
    height: calc(100vh - 70px);
    background: var(--color-bg-warm);
    border-right: 1px solid var(--color-secondary);
    overflow-y: auto;
    padding: var(--space-xl) 0;
}

.learn-sidebar__header {
    padding: 0 var(--space-lg) var(--space-lg);
    border-bottom: 1px solid var(--color-secondary);
    margin-bottom: var(--space-md);
}

.learn-sidebar__title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.learn-sidebar__subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ===== EXPANDABLE NAVIGATION ===== */
.learn-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.learn-nav__item {
    border-bottom: 1px solid var(--color-secondary-light);
}

/* Main category link */
.learn-nav__link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    color: var(--color-text-light);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
}

.learn-nav__link:hover {
    background: var(--color-secondary-light);
    color: var(--color-primary-dark);
}

.learn-nav__link.is-active {
    background: var(--color-primary);
    color: var(--color-white);
}

.learn-nav__link.is-expanded {
    background: var(--color-secondary-light);
    color: var(--color-primary-dark);
}

/* Arrow icon for expandable items */
.learn-nav__arrow {
    margin-left: auto;
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.learn-nav__link.is-expanded .learn-nav__arrow {
    transform: rotate(90deg);
}

.learn-nav__icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ===== SUBMENU (Level 2) ===== */
.learn-subnav {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: rgba(255, 255, 255, 0.5);
}

.learn-subnav.is-open {
    max-height: 1000px;
}

.learn-subnav__item {
    border-top: 1px solid var(--color-secondary-light);
}

.learn-subnav__link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg) var(--space-sm) var(--space-2xl);
    color: var(--color-text-light);
    text-decoration: none;
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.learn-subnav__link:hover {
    background: var(--color-secondary);
    color: var(--color-primary-dark);
}

.learn-subnav__link.is-active {
    background: var(--color-primary-light);
    color: var(--color-white);
    font-weight: var(--weight-medium);
}

.learn-subnav__link.is-expanded {
    background: var(--color-secondary);
    color: var(--color-primary-dark);
}

.learn-subnav__arrow {
    margin-left: auto;
    width: 14px;
    height: 14px;
    transition: transform var(--transition-fast);
}

.learn-subnav__link.is-expanded .learn-subnav__arrow {
    transform: rotate(90deg);
}

/* ===== DEEP SUBMENU (Level 3 - Food Topics) ===== */
.learn-deepnav {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: rgba(255, 255, 255, 0.7);
}

.learn-deepnav.is-open {
    max-height: 2000px;
}

.learn-deepnav__item {
    border-top: 1px solid var(--color-secondary-light);
}

.learn-deepnav__link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-lg) var(--space-xs) var(--space-3xl);
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: var(--text-xs);
    transition: all var(--transition-fast);
}

.learn-deepnav__link:hover {
    background: var(--color-secondary);
    color: var(--color-primary-dark);
}

.learn-deepnav__link.is-active {
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: var(--weight-medium);
}

.learn-deepnav__number {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: var(--weight-semibold);
    flex-shrink: 0;
}

.learn-deepnav__link.is-active .learn-deepnav__number {
    background: rgba(255, 255, 255, 0.3);
}

/* ===== SIDEBAR CTA ===== */
.learn-sidebar__cta {
    margin: var(--space-xl) var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg-dark);
    border-radius: var(--radius-md);
    text-align: center;
}

.learn-sidebar__cta-title {
    font-family: var(--font-heading);
    font-size: var(--text-base);
    color: var(--color-white);
    margin-bottom: var(--space-sm);
}

.learn-sidebar__cta-text {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-md);
    line-height: var(--leading-relaxed);
}

.learn-sidebar__cta .btn {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
}

/* ===== MAIN CONTENT AREA ===== */
.learn-main {
    background: var(--color-bg);
    min-height: calc(100vh - 70px);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .learn-layout {
        grid-template-columns: 260px 1fr;
    }

    .learn-subnav__link {
        padding-left: var(--space-xl);
    }

    .learn-deepnav__link {
        padding-left: var(--space-2xl);
    }
}

@media (max-width: 768px) {
    .learn-layout {
        grid-template-columns: 1fr;
    }

    .learn-sidebar {
        position: relative;
        top: 0;
        height: auto;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--color-secondary);
    }

    /* On mobile, show sidebar as collapsible */
    .learn-sidebar__toggle {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        padding: var(--space-md) var(--space-lg);
        background: var(--color-bg-warm);
        border: none;
        cursor: pointer;
        font-family: var(--font-heading);
        font-size: var(--text-lg);
    }

    .learn-sidebar__toggle-icon {
        width: 24px;
        height: 24px;
        transition: transform var(--transition-fast);
    }

    .learn-sidebar.is-collapsed .learn-nav {
        display: none;
    }

    .learn-sidebar.is-collapsed .learn-sidebar__cta {
        display: none;
    }

    .learn-sidebar__cta {
        margin: var(--space-md);
    }
}