/**
 * Sidebar Component - Admin Interface
 *
 * Main navigation sidebar with collapsible sections and active states.
 * Mobile: Off-canvas overlay, Tablet+: Fixed sidebar
 */

@layer admin-components {
    /**
     * Sidebar Container
     */
    .admin-sidebar {
        display: flex;
        flex-direction: column;
        background-color: var(--admin-sidebar-bg);
        color: var(--admin-sidebar-text);

        /* Spacing */
        padding: var(--admin-spacing-lg) 0;
    }

    /**
     * Sidebar Header (Logo + Title)
     */
    .admin-sidebar__header {
        padding: 0 var(--admin-spacing-lg);
        margin-bottom: var(--admin-spacing-xl);
        display: flex;
        align-items: center;
        gap: var(--admin-spacing-md);
    }

    .admin-sidebar__logo {
        width: 40px;
        height: 40px;
        flex-shrink: 0;
    }

    .admin-sidebar__title {
        font-size: var(--admin-font-size-lg);
        font-weight: 600;
        color: var(--admin-sidebar-text-hover);
        margin: 0;
    }

    /**
     * Navigation Section
     */
    .admin-nav {
        flex: 1;
        overflow-y: auto;
        display: flex;
        flex-direction: column;
        gap: var(--admin-spacing-xs);
    }

    .admin-nav__section {
        padding: 0 var(--admin-spacing-md);
    }

    .admin-nav__section-title {
        font-size: var(--admin-font-size-xs);
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--admin-sidebar-text);
        opacity: 0.7;
        padding: var(--admin-spacing-md) var(--admin-spacing-sm);
        margin: var(--admin-spacing-md) 0 var(--admin-spacing-xs);
    }

    /**
     * Navigation List
     */
    .admin-nav__list {
        list-style: none;
        margin: 0;
        padding: 0;
        display: flex;
        flex-direction: column;
        gap: var(--admin-spacing-xs);
    }

    /**
     * Navigation Items
     */
    .admin-nav__item {
        margin: 0;
    }

    .admin-nav__link {
        display: flex;
        align-items: center;
        gap: var(--admin-spacing-sm);
        padding: var(--admin-spacing-sm) var(--admin-spacing-md);
        border-radius: var(--admin-radius-md);
        color: var(--admin-sidebar-text);
        text-decoration: none;
        font-size: var(--admin-font-size-sm);
        font-weight: 500;
        transition: all var(--admin-transition-base);
        position: relative;

        /* Hover State */
        &:hover {
            background-color: var(--admin-hover-overlay);
            color: var(--admin-sidebar-text-hover);
        }

        /* Focus State */
        &:focus-visible {
            outline: 2px solid var(--admin-focus-ring);
            outline-offset: 2px;
        }

        /* Active State */
        &[aria-current="page"],
        &.admin-nav__link--active {
            background-color: var(--admin-sidebar-active);
            color: var(--admin-sidebar-text-hover);

            /* Active Indicator */
            &::before {
                content: '';
                position: absolute;
                left: 0;
                top: 50%;
                transform: translateY(-50%);
                width: 3px;
                height: 70%;
                background-color: var(--admin-accent-primary);
                border-radius: 0 2px 2px 0;
            }
        }
    }

    /**
     * Navigation Icons
     */
    .admin-nav__icon {
        width: 20px;
        height: 20px;
        flex-shrink: 0;
        opacity: 0.8;

        .admin-nav__link:hover &,
        .admin-nav__link[aria-current="page"] & {
            opacity: 1;
        }
    }

    /**
     * Badge (Notification Counter)
     */
    .admin-nav__badge {
        margin-left: auto;
        padding: 2px 8px;
        background-color: var(--admin-accent-error);
        color: white;
        font-size: var(--admin-font-size-xs);
        font-weight: 600;
        border-radius: 10px;
        min-width: 20px;
        text-align: center;
    }

    /**
     * Collapsible Submenu
     */
    .admin-nav__submenu {
        list-style: none;
        margin: var(--admin-spacing-xs) 0 0;
        padding: 0 0 0 calc(var(--admin-spacing-md) + 20px);
        display: none;
        flex-direction: column;
        gap: var(--admin-spacing-xs);

        /* Show when parent is active or expanded */
        .admin-nav__item--expanded > & {
            display: flex;
        }
    }

    .admin-nav__submenu .admin-nav__link {
        font-size: var(--admin-font-size-xs);
        padding: var(--admin-spacing-xs) var(--admin-spacing-sm);
    }

    /**
     * Expand/Collapse Toggle
     */
    .admin-nav__toggle {
        margin-left: auto;
        width: 16px;
        height: 16px;
        transition: transform var(--admin-transition-base);

        .admin-nav__item--expanded & {
            transform: rotate(90deg);
        }
    }

    /**
     * Sidebar Footer
     */
    .admin-sidebar__footer {
        margin-top: auto;
        padding: var(--admin-spacing-lg);
        border-top: 1px solid var(--admin-sidebar-border);
    }

    .admin-sidebar__user {
        display: flex;
        align-items: center;
        gap: var(--admin-spacing-sm);
        padding: var(--admin-spacing-sm);
        border-radius: var(--admin-radius-md);
        color: var(--admin-sidebar-text);
        text-decoration: none;
        transition: background-color var(--admin-transition-base);

        &:hover {
            background-color: var(--admin-hover-overlay);
        }
    }

    .admin-sidebar__avatar {
        width: 32px;
        height: 32px;
        border-radius: 50%;
        object-fit: cover;
        flex-shrink: 0;
    }

    .admin-sidebar__user-info {
        flex: 1;
        min-width: 0;
    }

    .admin-sidebar__user-name {
        font-size: var(--admin-font-size-sm);
        font-weight: 600;
        color: var(--admin-sidebar-text-hover);
        display: block;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .admin-sidebar__user-role {
        font-size: var(--admin-font-size-xs);
        color: var(--admin-sidebar-text);
        opacity: 0.8;
        display: block;
    }

    /**
     * Mobile Menu Toggle Button
     */
    .admin-sidebar__mobile-toggle {
        display: none;

        @media (max-width: 767px) {
            display: flex;
            align-items: center;
            justify-content: center;
            position: fixed;
            top: var(--admin-spacing-md);
            left: var(--admin-spacing-md);
            z-index: calc(var(--admin-z-sidebar) + 1);
            width: 44px;
            height: 44px;
            background-color: var(--admin-sidebar-bg);
            border: 1px solid var(--admin-sidebar-border);
            border-radius: var(--admin-radius-md);
            cursor: pointer;
            transition: background-color var(--admin-transition-base);

            &:hover {
                background-color: var(--admin-sidebar-active);
            }

            &:focus-visible {
                outline: 2px solid var(--admin-focus-ring);
                outline-offset: 2px;
            }
        }
    }

    .admin-sidebar__toggle-icon {
        width: 24px;
        height: 24px;
        color: var(--admin-sidebar-text-hover);
    }
}