@php
    $items = $items ?? [];
    $active = $active ?? null;
    $mode = $mode ?? 'side';
    $isShop = $isShop ?? false;
    $title = $title ?? null;

    // 현재 활성화된 아이템 찾기
    $activeItem = collect($items)->first(function($it) use ($active, $isShop) {
        if($isShop) return $active == $it['id'];
        return $active === ($it['key'] ?? $it['url']);
    });

    if (!$activeItem && $isShop) {
        foreach($items as $it) {
            if(!empty($it['children'])) {
                $child = collect($it['children'])->firstWhere('id', $active);
                if($child) { $activeItem = $child; break; }
            }
        }
    }
@endphp

@if($mode === 'tabs')
    {{--  모바일 전용: 한 줄에 2개씩 배치되는 그리드 디자인 --}}
    <nav class="mobile-subnav-grid" aria-label="모바일 카테고리">
        <div class="m-grid-container">
            @foreach($items as $it)
                @php
                    $isActive = $isShop ? ($active == $it['id']) : ($active && $active === ($it['key'] ?? $it['url']));
                    $hasActiveChild = $isShop && !empty($it['children']) && collect($it['children'])->contains('id', $active);
                    $isOpen = $isActive || $hasActiveChild;
                @endphp

                <div class="m-grid-item {{ $isOpen ? 'is-open' : '' }}">
                    <a href="{{ $it['url'] ?? '#' }}"
                       class="m-grid-link {{ $isOpen ? 'is-active' : '' }}">
                        {{ $it['label'] ?? '' }}
                    </a>

                    {{-- 1차 메뉴 활성 시 2차 메뉴 노출 (그리드 아래로 펼쳐짐) --}}
                    @if($isShop && !empty($it['children']) && $isOpen)
                        <div class="m-grid-sub-wrap">
                            @foreach($it['children'] as $child)
                                <a href="{{ $child['url'] }}"
                                   class="m-grid-sub-link {{ $active == $child['id'] ? 'is-active' : '' }}">
                                    {{ $child['label'] }}
                                </a>
                            @endforeach
                        </div>
                    @endif
                </div>
            @endforeach
        </div>
    </nav>
@else
    {{--  데스크톱 전용: 프리미엄 사이드바 (기존 유지) --}}
    <nav class="subnav subnav--side">
        <div class="subnav-box premium-design">
            @if($title)
                <div class="subnav-head">
                    <div class="subnav-title">{{ $title }}</div>
                    <div class="subnav-accent"></div>
                </div>
            @endif

            <ul class="subnav-list">
                @foreach($items as $it)
                    @php
                        $isActive = $isShop ? ($active == $it['id']) : ($active && $active === ($it['key'] ?? $it['url']));
                        $hasActiveChild = $isShop && !empty($it['children']) && collect($it['children'])->contains('id', $active);
                    @endphp
                    <li class="nav-group {{ $isActive || $hasActiveChild ? 'is-open' : '' }}">
                        <a href="{{ $it['url'] ?? '#' }}" class="nav-main-link {{ $isActive ? 'is-active' : '' }}">
                            <span class="label-text">{{ $it['label'] ?? '' }}</span>
                            @if(!empty($it['children']))
                                <i class="bi bi-chevron-down arrow-icon"></i>
                            @endif
                        </a>

                        @if($isShop && !empty($it['children']))
                            <ul class="nav-sub-list">
                                @foreach($it['children'] as $child)
                                    <li>
                                        <a href="{{ $child['url'] }}"
                                           class="nav-sub-link {{ $active == $child['id'] ? 'is-active' : '' }}">
                                            {{ $child['label'] }}
                                        </a>
                                    </li>
                                @endforeach
                            </ul>
                        @endif
                    </li>
                @endforeach
            </ul>
        </div>
    </nav>
@endif

<style>
    /* --- 모바일 그리드(Grid) 스타일 --- */
    .mobile-subnav-grid {
        margin-bottom: 25px;
    }

    .m-grid-container {
        display: grid;
        grid-template-columns: 1fr 1fr; /* 한 줄에 2개 */
        gap: 10px;
    }

    /* 2차 메뉴가 열릴 때 해당 행 전체를 차지하도록 설정 */
    .m-grid-item.is-open {
        grid-column: span 2; /* 활성화된 메뉴는 한 줄 전체 차지 (2차 메뉴 가독성) */
    }

    .m-grid-link {
        display: flex;
        align-items: center;
        justify-content: center;
        height: 50px;
        background: #f8f9fa;
        color: #444;
        border-radius: 12px;
        font-size: 0.95rem;
        font-weight: 600;
        text-decoration: none;
        border: 1px solid #eee;
        transition: all 0.2s;
        text-align: center;
    }

    .m-grid-link.is-active {
        background: #007bff;
        color: #fff;
        border-color: #007bff;
        box-shadow: 0 4px 12px rgba(0, 123, 255, 0.2);
    }

    /* 모바일 2차 메뉴 리스트 */
    .m-grid-sub-wrap {
        display: grid;
        grid-template-columns: 1fr 1fr; /* 2차 메뉴도 2개씩 */
        gap: 8px;
        background: #f1f3f5;
        padding: 12px;
        border-radius: 12px;
        margin-top: 8px;
    }

    .m-grid-sub-link {
        display: block;
        padding: 8px;
        font-size: 0.85rem;
        color: #666;
        text-decoration: none;
        background: #fff;
        border-radius: 8px;
        text-align: center;
        border: 1px solid #e9ecef;
    }

    .m-grid-sub-link.is-active {
        color: #007bff;
        font-weight: 700;
        border-color: #007bff;
    }

    /* --- 데스크톱 프리미엄 사이드바 (기존 유지) --- */
    .premium-design { border: none; background: #fff; box-shadow: 0 4px 20px rgba(0,0,0,0.05); border-radius: 20px; padding: 15px; }
    .subnav-head { padding: 10px 15px 15px; }
    .subnav-title { font-size: 0.75rem; font-weight: 800; color: #bbb; letter-spacing: 1px; }
    .subnav-accent { width: 20px; height: 3px; background: #007bff; margin-top: 6px; border-radius: 2px; }
    .nav-main-link {
        display: flex; align-items: center; justify-content: space-between;
        padding: 12px 16px; color: #444; font-weight: 600; border-radius: 12px; transition: 0.3s; text-decoration: none; margin-bottom: 2px;
    }
    .nav-main-link:hover { background: #f8f9fa; }
    .nav-main-link.is-active { background: #007bff; color: #fff; }
    .nav-sub-list { list-style: none; padding: 5px 0 10px 15px; }
    .nav-sub-link { display: block; padding: 7px 15px; font-size: 0.85rem; color: #777; text-decoration: none; border-radius: 8px; }
    .nav-sub-link.is-active { color: #007bff; background: #f0f7ff; font-weight: 700; }

    /* 화면 크기에 따른 노출 제어 */
    @media (max-width: 991px) {
        .subnav--side { display: none; }
    }
    @media (min-width: 992px) {
        .mobile-subnav-grid { display: none; }
    }
</style>