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

@layer components {
    /**
     * Sidebar Container
     *
     * Component styling for the admin sidebar.
     * Grid positioning is handled in _layout.css (grid-area: sidebar).
     */
    .admin-sidebar {
        /* Internal Layout (Flexbox for content) */
        display: flex;
        flex-direction: column;

        /* Styling */
        background-color: var(--sidebar-bg);
        color: var(--sidebar-text);

        /* Spacing */
        padding: var(--spacing-md) 0;

        /* Mobile: Hidden by default, shown via toggle */
        @media (max-width: 767px) {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--sidebar-width-mobile);
            max-width: 280px;
            transform: translateX(-100%);
            transition: transform var(--transition-base);
            z-index: var(--z-sidebar);
            overflow-y: auto;

            /* Mobile Menu Open State */
            &[data-mobile-menu-open="true"] {
                transform: translateX(0);
            }
        }

        /* Tablet+: Always visible */
        @media (min-width: 768px) {
            position: sticky;
            top: 0;
            height: 100vh;
            overflow-y: auto;
            border-right: 1px solid var(--sidebar-border);
        }
    }

    /**
     * Resize Handle
     */
    .admin-sidebar__resize-handle {
        display: none;

        @media (min-width: 768px) {
            display: block;
            position: absolute;
            right: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            cursor: col-resize;
            background-color: transparent;
            transition: background-color var(--transition-base);
            z-index: 10;
            user-select: none;

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

            &:active {
                background-color: var(--accent-primary);
            }

            /* Dark Theme Optimization */
            @media (prefers-color-scheme: dark) {
                &:hover {
                    background-color: oklch(from var(--sidebar-border) calc(l + 0.1) c h);
                }

                &:active {
                    background-color: var(--accent-primary);
                    opacity: 0.8;
                }
            }
        }
    }

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

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

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

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

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

    /**
     * Section Toggle (Summary)
     */
    .admin-nav__section-toggle {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        background: none;
        border: none;
        padding: 0;
        cursor: pointer;
        text-align: left;
        transition: background-color var(--transition-base), opacity var(--transition-base);
        list-style: none; /* Remove default list styling */
        border-radius: var(--radius-sm);

        /* Hide browser default marker */
        &::-webkit-details-marker {
            display: none;
        }

        &::marker {
            display: none;
        }

        &:hover {
            opacity: 1;
            background-color: var(--hover-overlay);
        }

        /* Dark Theme Hover Optimization */
        @media (prefers-color-scheme: dark) {
            &:hover {
                background-color: oklch(from var(--sidebar-bg) calc(l + 0.08) c h);
            }
        }

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

    /**
     * Section Title (using element selector)
     */
    .admin-nav summary h2 {
        font-size: var(--font-size-xs);
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--sidebar-text);
        opacity: 0.7;
        padding: var(--spacing-sm) var(--spacing-sm);
        margin: var(--spacing-sm) 0 var(--spacing-xs);
        pointer-events: none;
        transition: opacity var(--transition-base), color var(--transition-base);
    }

    /**
     * Section Toggle Icon (Chevron) - using element selector
     */
    .admin-nav summary svg {
        width: 16px;
        height: 16px;
        flex-shrink: 0;
        color: var(--sidebar-text);
        opacity: 0.5;
        transition: transform var(--transition-base), opacity var(--transition-base);
        pointer-events: none;
    }

    .admin-nav summary:hover svg {
        opacity: 0.8;
    }

    /**
     * Collapsed Section State (details:not([open]))
     */
    .admin-nav__section:not([open]) {
        summary svg {
            transform: rotate(-90deg);
        }

        ul {
            display: none;
        }
    }

    /**
     * Expanded Section State (details[open])
     */
    .admin-nav__section[open] {
        summary svg {
            transform: rotate(0deg);
        }

        summary h2 {
            opacity: 1;
            color: var(--sidebar-text-hover);
        }
    }

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

    /**
     * Navigation Items (using element selectors)
     */
    .admin-nav li {
        margin: 0;
    }

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

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

        /* Dark Theme Hover Optimization */
        @media (prefers-color-scheme: dark) {
            &:hover {
                background-color: oklch(from var(--sidebar-bg) calc(l + 0.05) c h);
            }
        }

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

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

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

    /**
     * Navigation Icons (using element selectors)
     */
    .admin-nav svg,
    .admin-nav .admin-nav__icon {
        width: 20px;
        height: 20px;
        flex-shrink: 0;
        opacity: 0.8;
    }

    .admin-nav a:hover svg,
    .admin-nav a:hover .admin-nav__icon,
    .admin-nav a[aria-current="page"] svg,
    .admin-nav a[aria-current="page"] .admin-nav__icon {
        opacity: 1;
    }

    /**
     * Badge (Notification Counter)
     */
    .admin-nav__badge {
        margin-left: auto;
        padding: 2px 8px;
        background-color: var(--accent-error);
        color: white;
        font-size: var(--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(--spacing-xs) 0 0;
        padding: 0 0 0 calc(var(--spacing-md) + 20px);
        display: none;
        flex-direction: column;
        gap: var(--spacing-xs);

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

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

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

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

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

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

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

        /* Dark Theme Optimization */
        @media (prefers-color-scheme: dark) {
            &:hover {
                background-color: oklch(from var(--sidebar-bg) calc(l + 0.05) c h);
            }
        }
    }

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

    .admin-sidebar__user-role {
        font-size: var(--font-size-xs);
        color: var(--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(--spacing-md);
            left: var(--spacing-md);
            z-index: calc(var(--z-sidebar) + 1);
            width: 44px;
            height: 44px;
            background-color: var(--sidebar-bg);
            border: 1px solid var(--sidebar-border);
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: background-color var(--transition-base);

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

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

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