.header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 999;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0.9rem 1.2rem;
        background: rgba(255, 255, 255, 0.55);
        backdrop-filter: blur(12px) saturate(160%);
        -webkit-backdrop-filter: blur(12px) saturate(160%);
        box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
        border-bottom: 1px solid rgba(255, 255, 255, 0.4);
        transition: background 0.3s ease, box-shadow 0.35s ease, backdrop-filter 0.35s ease, border-color 0.3s ease;
        height: 4.2rem;
    }
    .header.scrolled {
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: saturate(180%) blur(16px) brightness(1.02);
        -webkit-backdrop-filter: saturate(180%) blur(16px) brightness(1.02);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        border-bottom: 1px solid rgba(255, 255, 255, 0.8);
    }

    .menu-btn {
        width: 1.7rem;
        height: 1.7rem;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 0.3rem;
        cursor: pointer;
        flex-shrink: 0;
        position: relative;
        transition: transform 0.3s ease;
    }
    .menu-btn span {
        display: block;
        width: 1.5rem;
        height: 0.13rem;
        background: #000;
        border-radius: 2px;
        transition: all 0.35s cubic-bezier(0.68, -0.55, 0.27, 1.55);
        transform-origin: center;
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
    }
    .menu-btn span:nth-child(1) { top: 0.2rem; }
    .menu-btn span:nth-child(2) { top: 0.7rem; }
    .menu-btn span:nth-child(3) { top: 1.2rem; }

    .menu-btn.is-active span:nth-child(1) {
        top: 0.7rem;
        transform: translateX(-50%) rotate(45deg);
    }
    .menu-btn.is-active span:nth-child(2) {
        opacity: 0;
        transform: translateX(-50%) scaleX(0);
    }
    .menu-btn.is-active span:nth-child(3) {
        top: 0.7rem;
        transform: translateX(-50%) rotate(-45deg);
    }

    .desktop-nav {
        display: none;
        align-items: center;
        gap: 0.1rem;
        flex: 1;
        margin-left: 1.2rem;
    }
    .desktop-nav .nav-item {
        position: relative;
        padding: 0.25rem 0.7rem;
        font-size: 0.82rem;
        font-weight: 500;
        color: #1d1d1f;
        cursor: pointer;
        border-radius: 4px;
        transition: background 0.2s ease, color 0.2s ease;
        white-space: nowrap;
        user-select: none;
        text-decoration: none;
        display: block;
    }
    .desktop-nav .nav-item:hover {
        background: rgba(137, 130, 188, 0.06);
        color: #8982bc;
    }
    .desktop-nav .nav-item .nav-label {
        display: flex;
        align-items: center;
        gap: 0.15rem;
        color: inherit;
    }
    .desktop-nav .nav-item.has-dropdown .nav-label::after {
        content: '▾';
        font-size: 0.5rem;
        opacity: 0.5;
        margin-left: 0.15rem;
        transition: transform 0.2s ease;
    }
    .desktop-nav .nav-item.has-dropdown:hover .nav-label::after {
        transform: rotate(180deg);
    }
    .desktop-nav .nav-item[data-target="activity"] .nav-label {
        color: #d4a017;
        font-weight: 600;
    }
    .desktop-nav .nav-item[data-target="activity"]:hover .nav-label {
        color: #b8860b;
    }

    /* PC端下拉菜单 */
    .desktop-nav .dropdown {
        position: absolute;
        top: calc(100% + 0.4rem);
        left: 0;
        min-width: 200px;
        background: #ffffff;
        border-radius: 6px;
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.10);
        border: 1px solid rgba(0, 0, 0, 0.04);
        padding: 0.4rem 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-4px) scale(0.98);
        transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
        pointer-events: none;
        z-index: 1000;
    }
    .desktop-nav .nav-item:hover .dropdown,
    .desktop-nav .nav-item.dropdown-open .dropdown {
        opacity: 1;
        visibility: visible;
        transform: translateY(0) scale(1);
        pointer-events: auto;
    }
    .desktop-nav .dropdown .drop-item {
        padding: 0.5rem 1.1rem;
        font-size: 0.82rem;
        color: #1d1d1f;
        cursor: pointer;
        transition: background 0.15s ease, color 0.15s ease;
        display: flex;
        align-items: center;
        justify-content: space-between;
        border-left: 3px solid transparent;
        text-decoration: none;
    }
    .desktop-nav .dropdown .drop-item:hover {
        background: #F8F9FE;
        color: #8982bc;
        border-left-color: #8982bc;
    }
    .desktop-nav .dropdown .drop-item .drop-arrow {
        color: #8982bc;
        font-size: 0.85rem;
        opacity: 0.4;
        transition: opacity 0.2s ease;
    }
    .desktop-nav .dropdown .drop-item:hover .drop-arrow {
        opacity: 1;
    }

    /* 产品 mega dropdown */
    .desktop-nav .dropdown.mega-dropdown {
        display: flex;
        padding: 0;
        min-width: auto;
        overflow: visible;
    }
    .mega-left {
        width: 180px;
        background: #F8F9FE;
        padding: 0.4rem 0;
        display: flex;
        flex-direction: column;
        flex-shrink: 0;
        border-right: 1px solid #eef0f5;
        border-radius: 6px 0 0 6px;
    }
    .mega-left .mega-item {
        padding: 0.6rem 1.1rem;
        font-size: 0.82rem;
        color: #1d1d1f;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: space-between;
        transition: background 0.15s ease, color 0.15s ease;
        border-left: 3px solid transparent;
        white-space: nowrap;
        text-decoration: none;
    }
    .mega-left .mega-item:hover,
    .mega-left .mega-item.active {
        background: #ffffff;
        color: #8982bc;
        border-left-color: #8982bc;
    }
    .mega-left .mega-item .mega-arrow {
        font-size: 0.8rem;
        color: #c0c4cc;
    }
    .mega-left .mega-item:hover .mega-arrow,
    .mega-left .mega-item.active .mega-arrow {
        color: #8982bc;
    }
    .mega-right {
        flex: 1;
        min-width: 220px;
        background: #ffffff;
        padding: 0.4rem 0;
        border-radius: 0 6px 6px 0;
    }
    .mega-right .mega-panel {
        display: none;
        padding: 0.2rem 0;
    }
    .mega-right .mega-panel.active {
        display: block;
    }
    .mega-right .mega-sub-item {
        padding: 0.5rem 1.2rem;
        font-size: 0.8rem;
        color: #4b5563;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: space-between;
        text-decoration: none;
        transition: background 0.15s ease, color 0.15s ease, padding-left 0.15s ease;
        white-space: nowrap;
    }
    .mega-right .mega-sub-item:hover {
        background: #F0F4FF;
        color: #8982bc;
        padding-left: 1.5rem;
    }
    .mega-right .mega-sub-item .mega-sub-arrow {
        font-size: 0.8rem;
        color: #c0c4cc;
        margin-left: 0.5rem;
    }
    .mega-right .mega-sub-item:hover .mega-sub-arrow {
        color: #8982bc;
    }

    .logo {
        display: flex;
        align-items: center;
        cursor: default;
        user-select: none;
        flex-shrink: 0;
    }
    .logo img {
        height: 2rem;
        width: auto;
        display: block;
        max-height: 2rem;
        object-fit: contain;
    }

    .user-avatar {
        width: 2rem;
        height: 2rem;
        border-radius: 50%;
        overflow: hidden;
        flex-shrink: 0;
        cursor: pointer;
        transition: transform 0.2s ease;
    }
    .user-avatar:active { transform: scale(0.92); }
    .user-avatar img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
    }

    .pc-user-actions {
        display: none;
        align-items: stretch;
        height: 100%;
        margin-left: auto;
        flex-shrink: 0;
        align-self: stretch;
    }
    .pc-user-actions .pc-action {
        font-size: 0.82rem;
        color: #1d1d1f;
        cursor: pointer;
        padding: 0 0.85rem;
        height: 100%;
        display: flex;
        align-items: center;
        transition: color 0.2s ease, background 0.2s ease;
        white-space: nowrap;
        user-select: none;
        text-decoration: none;
    }
    .pc-user-actions .pc-action:hover {
        color: #8982bc;
        background: rgba(137, 130, 188, 0.04);
    }
    .pc-user-actions .pc-divider {
        color: #d1d5db;
        font-size: 0.75rem;
        padding: 0 0.1rem;
        user-select: none;
        display: flex;
        align-items: center;
    }
    .pc-user-actions .pc-action.register-btn {
        background: #8982bc;
        color: #ffffff;
        font-weight: 500;
        border-radius: 0;
        padding: 0 1.2rem;
        height: 100%;
        display: flex;
        align-items: center;
        margin: 0;
        text-decoration: none;
        transition: background 0.2s ease;
    }
    .pc-user-actions .pc-action.register-btn:hover {
        background: #6f68a3;
        color: #ffffff;
    }

    .sidebar-overlay {
        position: fixed;
        top: 4.2rem;
        left: 0;
        width: 100vw;
        height: calc(100vh - 4.2rem);
        z-index: 998;
        background: rgba(0, 0, 0, 0.30);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.4s ease, visibility 0.4s ease;
        pointer-events: none;
    }
    .sidebar-overlay.open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }
    .sidebar {
        position: fixed;
        top: 4.2rem;
        left: 0;
        width: 100vw;
        height: calc(100vh - 4.2rem);
        z-index: 999;
        display: flex;
        transform: translateX(-100%);
        transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
        background: #ffffff;
        overflow: hidden;
        pointer-events: none;
        border-top: 1px solid rgba(0, 0, 0, 0.04);
    }
    .sidebar.open {
        transform: translateX(0);
        pointer-events: auto;
    }
    .sidebar-left {
        width: 33.333%;
        height: 100%;
        background: #F8F9FE;
        padding: 0;
        display: flex;
        flex-direction: column;
        flex-shrink: 0;
        overflow-y: auto;
        border-right: 1px solid rgba(137, 130, 188, 0.06);
    }
    .sidebar-menu {
        display: flex;
        flex-direction: column;
        gap: 0;
        flex: 1;
    }
    .sidebar-menu .menu-item {
        padding: 1rem 1rem;
        font-size: 1.05rem;
        font-weight: 500;
        color: #1d1d1f;
        cursor: pointer;
        border-radius: 0;
        transition: background 0.25s ease, color 0.25s ease;
        background: transparent;
        border: none;
        text-align: left;
        width: 100%;
        font-family: inherit;
        box-shadow: none;
        margin: 0;
    }
    .sidebar-menu .menu-item.active {
        background: #ffffff;
        color: #8982bc;
        box-shadow: none;
        border: none;
    }
    .sidebar-menu .menu-item:not(.active):hover {
        background: rgba(137, 130, 188, 0.06);
        color: #8982bc;
    }

    .sidebar-home-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.35rem;
        margin: 1rem auto 1.6rem;
        padding: 0.55rem 1.1rem;
        background: transparent;
        border: 1px solid #8982bc;
        border-radius: 0;
        color: #8982bc;
        font-size: 0.95rem;
        font-weight: 500;
        font-family: inherit;
        text-decoration: none;
        cursor: pointer;
        transition: background 0.2s ease, color 0.2s ease;
        width: auto;
        max-width: 90%;
        align-self: center;
    }
    .sidebar-home-btn:hover,
    .sidebar-home-btn:active {
        background: rgba(137, 130, 188, 0.06);
        color: #8982bc;
    }
    .sidebar-home-btn svg {
        width: 1rem;
        height: 1rem;
        stroke: currentColor;
        stroke-width: 2;
        fill: none;
        flex-shrink: 0;
    }

    .sidebar-right {
        width: 66.667%;
        height: 100%;
        background: #ffffff;
        padding: 1.8rem 2rem 2rem 2rem;
        overflow-y: auto;
        flex-shrink: 0;
    }
    .sidebar-right .content-title {
        font-size: 1.6rem;
        font-weight: 700;
        color: #1d1d1f;
        margin-bottom: 1.5rem;
        padding-bottom: 0.6rem;
        border-bottom: 2px solid #F0F3F8;
    }
    .sidebar-right .content-list {
        display: flex;
        flex-direction: column;
        gap: 0.8rem;
    }
    .sidebar-right .content-item {
        padding: 1rem 1.2rem;
        background: #F8F9FE;
        border-radius: 4px;
        border-left: 3px solid #8982bc;
        cursor: pointer;
        transition: all 0.25s ease;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    .sidebar-right .content-item:hover {
        background: #eef4ff;
        transform: translateX(4px);
    }
    .sidebar-right .content-item .item-title {
        font-size: 1.05rem;
        font-weight: 600;
        color: #1d1d1f;
    }
    .sidebar-right .content-item .item-desc {
        font-size: 0.9rem;
        color: #667085;
        margin-top: 0.2rem;
    }
    .sidebar-right .content-item .item-arrow {
        color: #8982bc;
        font-size: 1.2rem;
        font-weight: 300;
        flex-shrink: 0;
        margin-left: 1rem;
    }
    .sidebar-right .content-item .item-content {
        display: flex;
        flex-direction: column;
        flex: 1;
    }

    .sidebar-right .content-item.item-plain {
        text-decoration: none;
        color: inherit;
        padding: 1.1rem 1.2rem;
        background: transparent;
        border: none;
        border-radius: 0;
        border-bottom: 1px solid #F0F3F8;
        transition: color 0.2s ease;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    .sidebar-right .content-item.item-plain:last-child {
        border-bottom: none;
    }
    .sidebar-right .content-item.item-plain:hover {
        background: transparent;
        transform: none;
        color: #8982bc;
    }
    .sidebar-right .content-item.item-plain .item-title {
        font-size: 1.05rem;
        font-weight: 600;
        color: #1d1d1f;
        margin: 0;
    }
    .sidebar-right .content-item.item-plain .item-right-text {
        font-size: 0.95rem;
        color: #667085;
        white-space: nowrap;
        flex-shrink: 0;
        margin-left: 1rem;
    }
    .sidebar-right .content-item.item-plain:hover .item-right-text {
        color: #8982bc;
    }
    .sidebar-right .content-item.item-plain .item-badge-hot {
        background: #f03838;
        color: #ffffff;
        font-size: 0.7rem;
        font-weight: 600;
        padding: 0.15rem 0.45rem;
        border-radius: 3px;
        line-height: 1.3;
        margin-left: 0.4rem;
    }

    .product-accordion {
        display: flex;
        flex-direction: column;
        gap: 0;
    }
    .product-accordion .acc-group {
        border: none;
        border-radius: 0;
        background: transparent;
        overflow: visible;
    }
    .product-accordion .acc-group.open {
        border: none;
    }
    .product-accordion .acc-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0.9rem 0.2rem;
        font-size: 0.95rem;
        font-weight: 600;
        color: #1d1d1f;
        cursor: pointer;
        user-select: none;
        background: transparent;
        border: none;
        border-bottom: 0.5px solid #F0F3F8;
        transition: color 0.2s ease;
    }
    .product-accordion .acc-group.open .acc-header {
        background: transparent;
        color: #8982bc;
    }
    .product-accordion .acc-header .acc-arrow {
        font-size: 0.7rem;
        color: #9ca3af;
        transition: transform 0.3s ease, color 0.2s ease;
    }
    .product-accordion .acc-group.open .acc-header .acc-arrow {
        transform: rotate(180deg);
        color: #8982bc;
    }
    .product-accordion .acc-body {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        background: transparent;
    }
    .product-accordion .acc-group.open .acc-body {
        max-height: 800px;
    }
    .product-accordion .acc-body-inner {
        padding: 0.3rem 0 0.5rem;
        display: flex;
        flex-direction: column;
        gap: 0;
    }
    .product-accordion .acc-sub-item {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0.6rem 0.2rem;
        font-size: 0.88rem;
        color: #4b5563;
        text-decoration: none;
        border-radius: 0;
        transition: color 0.2s ease, padding-left 0.2s ease;
        cursor: pointer;
    }
    .product-accordion .acc-sub-item:last-child {
        border-bottom: none;
    }
    .product-accordion .acc-sub-item:hover,
    .product-accordion .acc-sub-item:active {
        background: transparent;
        color: #8982bc;
        padding-left: 0.6rem;
    }
    .product-accordion .acc-sub-item .sub-arrow {
        font-size: 0.9rem;
        color: #c0c4cc;
        margin-left: 0.5rem;
    }
    .product-accordion .acc-sub-item:hover .sub-arrow {
        color: #8982bc;
    }

    .sidebar-left::-webkit-scrollbar,
    .sidebar-right::-webkit-scrollbar { width: 3px; }
    .sidebar-left::-webkit-scrollbar-thumb {
        background: rgba(137, 130, 188, 0.15);
        border-radius: 2px;
    }
    .sidebar-right::-webkit-scrollbar-track { background: #F0F3F8; }
    .sidebar-right::-webkit-scrollbar-thumb {
        background: #d1d9e6;
        border-radius: 2px;
    }

    @media (min-width: 1024px) {
        .menu-btn { display: none !important; }
        .sidebar-overlay,
        .sidebar { display: none !important; }
        .desktop-nav { display: flex !important; }

        .header {
            height: 2.6rem;
            padding: 0;
            padding-left: 1.6rem;
        }
        .logo img {
            height: 1.4rem;
            max-height: 1.4rem;
        }
        .user-avatar {
            display: none !important;
        }
        .pc-user-actions {
            display: flex;
        }

        .desktop-nav .dropdown {
            min-width: 210px;
            border-radius: 8px;
            box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
            padding: 0.4rem 0;
            max-height: 70vh;
            overflow-y: auto;
        }
        .desktop-nav .dropdown .drop-item {
            padding: 0.55rem 1.3rem;
            font-size: 0.82rem;
        }
        .desktop-nav {
            gap: 0.1rem;
            margin-left: 1.2rem;
        }
        .desktop-nav .nav-item {
            padding: 0.25rem 0.7rem;
            font-size: 0.82rem;
        }
        .desktop-nav .dropdown.mega-dropdown {
            max-height: none;
            overflow: visible;
            padding: 0;
        }

        .desktop-nav .nav-item[data-target="products"] {
            position: static; 
        }
        .desktop-nav .nav-item[data-target="products"] .dropdown.mega-dropdown {
            position: fixed;
            top: 2.6rem;           
            left: 0;
            right: 0;
            width: 100vw;
            min-width: 100vw;
            max-width: 100vw;
            background: #ffffff;
            border-radius: 0;
            box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
            border-top: 1px solid rgba(0, 0, 0, 0.04);
            border-left: none;
            border-right: none;
            border-bottom: none;
            padding: 0;
            display: flex;
            flex-direction: row;
            max-height: calc(100vh - 2.6rem);
            overflow-y: auto;
            transform: translateY(-8px) scale(1);
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s cubic-bezier(0.2, 0.9, 0.4, 1),
                        transform 0.3s cubic-bezier(0.2, 0.9, 0.4, 1),
                        visibility 0.3s;
            pointer-events: none;
            z-index: 1000;
            box-sizing: border-box;
        }
        .desktop-nav .nav-item[data-target="products"]:hover .dropdown.mega-dropdown,
        .desktop-nav .nav-item[data-target="products"].dropdown-open .dropdown.mega-dropdown {
            opacity: 1;
            visibility: visible;
            transform: translateY(0) scale(1);
            pointer-events: auto;
        }

        /* 左侧一级菜单区域 —— 变成更宽的列表，背景浅灰 */
        .desktop-nav .nav-item[data-target="products"] .mega-left {
            width: 260px;
            min-width: 260px;
            background: #F8FAFE;
            padding: 1.6rem 0;
            display: flex;
            flex-direction: column;
            flex-shrink: 0;
            border-right: 1px solid #eef2f8;
            border-radius: 0;
            box-sizing: border-box;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-left .mega-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.85rem 1.8rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: #1d1d1f;
            cursor: pointer;
            transition: background 0.2s ease, color 0.2s ease;
            border-left: 4px solid transparent;
            white-space: nowrap;
            text-decoration: none;
            background: transparent;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-left .mega-item:hover,
        .desktop-nav .nav-item[data-target="products"] .mega-left .mega-item.active {
            background: #ffffff;
            color: #8982bc;
            border-left-color: #8982bc;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-left .mega-item .mega-arrow {
            font-size: 1rem;
            color: #c0c4cc;
            transition: color 0.2s ease, transform 0.2s ease;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-left .mega-item:hover .mega-arrow,
        .desktop-nav .nav-item[data-target="products"] .mega-left .mega-item.active .mega-arrow {
            color: #8982bc;
            transform: translateX(2px);
        }

        /* 右侧二级菜单区域 —— 卡片网格布局 */
        .desktop-nav .nav-item[data-target="products"] .mega-right {
            flex: 1;
            min-width: 0;
            background: #ffffff;
            padding: 1.8rem 2.4rem 2rem 2.4rem;
            border-radius: 0;
            box-sizing: border-box;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel {
            display: none;
            padding: 0;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel.active {
            display: block;
        }

        /* 卡片网格 */
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel {
            /* 用网格展示二级菜单 */
        }
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel .mega-sub-item {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            padding: 1.2rem 1.2rem 1rem 1.2rem;
            background: #F9FAFD;
            border-radius: 10px;
            border: 1px solid #edf2f9;
            text-decoration: none;
            color: inherit;
            transition: all 0.25s ease;
            cursor: pointer;
            position: relative;
            min-height: 100px;
            white-space: normal;
            box-sizing: border-box;
            margin: 0;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel .mega-sub-item:hover {
            background: #ffffff;
            border-color: #8982bc;
            box-shadow: 0 8px 24px rgba(137, 130, 188, 0.10);
            transform: translateY(-2px);
            padding-left: 1.2rem; /* 覆盖原有 hover 位移 */
        }
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel .mega-sub-item .mega-sub-arrow {
            display: none; /* 隐藏原来的小箭头 */
        }
        /* 为卡片添加标题和描述样式（利用原有 span） */
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel .mega-sub-item > span:first-child {
            font-size: 0.95rem;
            font-weight: 600;
            color: #1d1d1f;
            margin-bottom: 0.3rem;
            transition: color 0.2s ease;
            display: block;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel .mega-sub-item:hover > span:first-child {
            color: #8982bc;
        }
        /* 使用伪元素添加描述文字（因为原有结构没有描述） */
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel .mega-sub-item::after {
            content: '探索产品详情 ›';
            font-size: 0.75rem;
            color: #9ca3af;
            transition: color 0.2s ease, opacity 0.2s ease;
            opacity: 0.7;
            margin-top: auto;
            align-self: flex-end;
        }
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel .mega-sub-item:hover::after {
            color: #8982bc;
            opacity: 1;
        }

        /* 卡片网格容器 */
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel.active {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 1rem;
        }
        /* 如果面板内没有子项，显示提示（可选） */
        .desktop-nav .nav-item[data-target="products"] .mega-right .mega-panel:empty::before {
            content: '暂无产品';
            display: block;
            text-align: center;
            color: #9ca3af;
            padding: 2rem;
            font-size: 0.9rem;
        }
    }

    @media (min-width: 820px) and (max-width: 1023px) {
        html {
            font-size: 12.8px;
        }
    }

    @media (min-width: 768px) and (max-width: 1023px) {
        .sidebar-left {
            width: 40%;
        }
        .sidebar-right {
            width: 60%;
            padding: 1.5rem 1.2rem 1.5rem;
        }
        .sidebar-menu .menu-item {
            font-size: 0.95rem;
            padding: 0.9rem 0.9rem;
        }
        .sidebar-right .content-title {
            font-size: 1.3rem;
        }
    }

    @media (max-width: 767px) {
        .header {
            height: 3.8rem;
            padding: 0.7rem 1rem;
            flex-direction: row;
            justify-content: space-between;
        }
        .logo {
            order: 1;
            margin-right: auto;
        }
        .menu-btn {
            order: 3;
            margin-left: 0.8rem;
            position: relative;
            top: 0;
            left: 0;
            transform: none;
        }
        .user-avatar {
            order: 2;
            margin-left: 0.2rem;
        }
        .desktop-nav { display: none !important; }
        .pc-user-actions { display: none !important; }
        .sidebar-overlay {
            top: 3.8rem;
            height: calc(100vh - 3.8rem);
        }
        .sidebar {
            top: 3.8rem;
            height: calc(100vh - 3.8rem);
        }
        .sidebar-left {
            width: 45%;
            padding: 0;
        }
        .sidebar-right {
            width: 55%;
            padding: 1.2rem 0.8rem 1rem;
        }
        .sidebar-menu .menu-item {
            font-size: 0.9rem;
            padding: 1rem 0.9rem;
            border-radius: 0;
            box-shadow: none;
            margin: 0;
        }
        .sidebar-right .content-title {
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
        }
    }

    @media (max-width: 380px) {
        .header {
            height: 3.5rem;
            padding: 0.6rem 0.8rem;
        }
        .sidebar-overlay {
            top: 3.5rem;
            height: calc(100vh - 3.5rem);
        }
        .sidebar {
            top: 3.5rem;
            height: calc(100vh - 3.5rem);
        }
    }