.head_menu * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* 导航容器：固定在顶部，带平滑阴影和背景，提高层级 */
        .head_menu {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            width: 100%;
            background: #ffffff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.03);
            position: sticky;        /* 粘性定位实现滚动固定 */
            top: 0;                  /* 紧贴顶部 */
            left: 0;
            z-index: 10000;           /* 保证覆盖页面其他内容 */
            transition: box-shadow 0.2s ease;
        }
        /* 滚动时稍微加强阴影，提升视觉区分 (可选) */
        .head_menu.scrolled {
            box-shadow: 0 4px 16px rgba(0,0,0,0.08);
        }

        .head_menu .head_menu-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
			width:100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 2%;
            height: 80px;
            position: relative;
        }

        /* ----- LOGO ----- */
        .head_menu .head_menu-logo {
            display: flex;
            align-items: center;
            flex-shrink: 0;
        }
        .head_menu .head_menu-logo a {
            display: block;
            line-height: 0;
        }
        .head_menu .head_menu-logo img {
            height: 65px;
            width: auto;
            display: block;
            max-width: 180px;
            border: 0;
        }

        /* ----- 桌面导航 ----- */
        .head_menu .head_menu-desktop-nav {
            display: flex;
            align-items: center;
            flex: 1 1 auto;
            justify-content: flex-end;
            margin-left: 20px;
        }

        .head_menu .head_menu-primary {
            display: flex;
            align-items: center;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .head_menu .head_menu-primary > li {
            flex: 1 0 auto;
            text-align: center;
            position: relative;
            white-space: nowrap;
        }
        .head_menu .head_menu-primary > li > a {
            display: inline-block;
            padding: 10px 20px;
            font-size: 1rem;
            font-weight: 500;
            color: #000000;
            text-decoration: none;
            transition: color 0.2s ease;
            position: relative;
            line-height: 1.2;
        }
        .head_menu .head_menu-primary > li > a:hover {
            color: #cc0000;
        }
        .head_menu .head_menu-primary > li > a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 3px;
            background: #cc0000;
            transform: scaleX(0);
            transition: transform 0.2s ease;
            border-radius: 2px;
        }
        .head_menu .head_menu-primary > li > a:hover::after {
            transform: scaleX(1);
        }

        .head_menu .head_menu-primary > li.has-sub > a i {
            margin-left: 5px;
            font-size: 0.8rem;
            color: inherit;
            transition: transform 0.2s;
        }
        .head_menu .head_menu-primary > li.has-sub > a:hover i {
            transform: rotate(-180deg);
        }

        /* ----- 二级菜单：彻底解决消失 + 不重叠（桥梁技术 + 安全区） ----- */
        .head_menu .head_menu-primary > li.has-sub {
            position: relative;
        }

        /* 透明桥梁：连接一级与二级，防止消失，且不重叠 */
        .head_menu .head_menu-primary > li.has-sub::before {
            content: '';
            position: absolute;
            top: 100%;          /* 紧贴一级底部 */
            left: 0;
            width: 100%;
            height: 18px;        /* 桥梁高度，保证过渡顺滑 */
            background: transparent;
            z-index: 1001;
            pointer-events: auto;
        }

        /* 二级菜单主容器：初始隐藏，通过悬停显示 */
        .head_menu .head_menu-secondary {
            position: absolute;
            top: calc(100% + 18px); /* 位于桥梁下方，确保不重叠 */
            left: 50%;
            transform: translateX(-50%) translateY(8px);
            visibility: hidden;
            opacity: 0;
            background: #ffffff;
            min-width: 200px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.08);
            border-radius: 6px;
            padding: 8px 0;
            list-style: none;
            margin: 0;
            z-index: 1002;       /* 高于桥梁，保证显示 */
            transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
            border: 1px solid #f0f0f0;
            text-align: left;
            white-space: nowrap;
            pointer-events: none;  /* 初始禁止点击，显示后才允许 */
        }

        /* 核心修复：悬停显示二级 —— 利用桥梁保持状态，同时二级本身悬停也保持显示 */
        .head_menu .head_menu-primary > li.has-sub:hover .head_menu-secondary,
        .head_menu .head_menu-primary > li.has-sub .head_menu-secondary:hover {
            visibility: visible;
            opacity: 1;
            transform: translateX(-50%) translateY(0);
            pointer-events: auto;
        }

        /* 增加一个额外的“隐形安全区”包裹二级，防止鼠标移动到二级过程中丢失 */
        .head_menu .head_menu-primary > li.has-sub .head_menu-secondary::before {
            content: '';
            position: absolute;
            top: -18px;          /* 向上延伸到桥梁区域 */
            left: 0;
            width: 100%;
            height: 18px;
            background: transparent;
            pointer-events: auto; /* 让这片区域也能接收鼠标事件 */
        }

        /* 二级菜单项样式 */
        .head_menu .head_menu-secondary li {
            border-bottom: 1px solid #eaeaea;
        }
        .head_menu .head_menu-secondary li:last-child {
            border-bottom: none;
        }
        .head_menu .head_menu-secondary a {
            display: block;
            padding: 12px 20px;
            color: #333333;
            text-decoration: none;
            font-size: 0.95rem;
            transition: background 0.15s, color 0.15s;
        }
        .head_menu .head_menu-secondary a:hover {
            background-color: #fafafa;
            color: #cc0000;
        }

        /* ----- 右侧红色搜索图标 & 下拉框 ----- */
        .head_menu .head_menu-search-wrapper {
            position: relative;
            margin-left: 20px;
            flex-shrink: 0;
        }
        .head_menu .head_menu-search-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: #cc0000;
            color: #ffffff;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1.2rem;
            transition: background 0.2s;
            border: none;
            outline: none;
        }
        .head_menu .head_menu-search-icon:hover {
            background: #c5000f;
        }

        .head_menu .head_menu-search-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            margin-top: 10px;
            width: 280px;
            background: #ffffff;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            padding: 16px;
            visibility: hidden;
            opacity: 0;
            transform: translateY(10px);
            transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease;
            z-index: 1002;
            border: 1px solid #f3f3f3;
        }
        .head_menu .head_menu-search-dropdown.active {
            visibility: visible;
            opacity: 1;
            transform: translateY(0);
        }
        .head_menu .head_menu-search-form {
            display: flex;
            align-items: center;
            width: 100%;
        }
        .head_menu .head_menu-search-form input {
            flex: 1;
            height: 42px;
            border: 1px solid #ddd;
            border-radius: 30px 0 0 30px;
            padding: 0 15px;
            font-size: 0.9rem;
            outline: none;
            border-right: none;
        }
        .head_menu .head_menu-search-form button {
            width: 50px;
            height: 42px;
            background: #cc0000;
            border: none;
            border-radius: 0 30px 30px 0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.1rem;
            cursor: pointer;
            transition: background 0.15s;
        }
        .head_menu .head_menu-search-form button:hover {
            background: #c5000f;
        }

        /* ----- 移动端布局 ----- */
        .head_menu .head_menu-mobile-trigger {
            display: none;
        }
        .head_menu .head_menu-mobile-nav {
            display: none;
        }

        @media screen and (max-width: 900px) {
            .head_menu .head_menu-desktop-nav {
                display: none;
            }

            .head_menu .head_menu-container {
                height: 70px;
                padding: 0 15px;
            }

            .head_menu .head_menu-mobile-trigger {
                display: flex;
                align-items: center;
                flex-shrink: 0;
            }

            .head_menu .head_menu-mobile-actions {
                display: flex;
                align-items: center;
                gap: 8px;
                margin-left: auto;
            }

            .head_menu .head_menu-mobile-search {
                display: flex;
                align-items: center;
                justify-content: center;
                width: 42px;
                height: 42px;
                background: #cc0000;
                color: white;
                border-radius: 8px;
                cursor: pointer;
                font-size: 1.2rem;
            }
            .head_menu .head_menu-mobile-hamburger {
                display: flex;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                width: 42px;
                height: 42px;
                background: #cc0000;
                border-radius: 8px;
                cursor: pointer;
                color: white;
                font-size: 1.4rem;
            }

            .head_menu .head_menu-search-dropdown {
                width: calc(100vw - 30px);
                max-width: 350px;
                right: 0;
            }

            .head_menu .head_menu-mobile-nav {
                display: block;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: #ffffff;
                box-shadow: 0 15px 25px rgba(0,0,0,0.1);
                padding: 10px 20px 20px;
                z-index: 1000;
                visibility: hidden;
                opacity: 0;
                transform: translateY(-10px);
                transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
                border-top: 1px solid #f0f0f0;
            }
            .head_menu .head_menu-mobile-nav.open {
                visibility: visible;
                opacity: 1;
                transform: translateY(0);
            }

            .head_menu .head_menu-mobile-primary {
                list-style: none;
                margin: 0;
                padding: 0;
            }
            .head_menu .head_menu-mobile-primary > li {
                border-bottom: 1px solid #f0f0f0;
            }
            .head_menu .head_menu-mobile-primary > li > a {
                display: flex;
                align-items: center;
                justify-content: space-between;
                padding: 15px 5px;
                color: #000000;
                text-decoration: none;
                font-weight: 500;
                font-size: 1rem;
            }
            .head_menu .head_menu-mobile-primary > li > a i {
                color: #cc0000;
                transition: transform 0.3s;
                font-size: 1rem;
            }
            .head_menu .head_menu-mobile-primary > li:not(.has-sub) > a i {
                display: none;
            }

            .head_menu .head_menu-mobile-secondary {
                list-style: none;
                margin: 0 0 0 15px;
                padding: 0 0 5px 0;
                display: none;
            }
            .head_menu .head_menu-mobile-secondary.open {
                display: block;
            }
            .head_menu .head_menu-mobile-secondary li {
                border-bottom: 1px solid #eaeaea;
            }
            .head_menu .head_menu-mobile-secondary li:last-child {
                border-bottom: none;
            }
            .head_menu .head_menu-mobile-secondary a {
                display: block;
                padding: 12px 10px;
                color: #333;
                text-decoration: none;
                font-size: 0.95rem;
            }
            .head_menu .head_menu-mobile-secondary a:hover {
                background: #f9f9f9;
            }

            .head_menu .head_menu-mobile-primary > li.has-sub > a .fa-chevron-down {
                transition: transform 0.3s;
            }
            .head_menu .head_menu-mobile-primary > li.has-sub > a.open-sub i {
                transform: rotate(180deg);
            }
        }

        @media screen and (max-width: 480px) {
            .head_menu .head_menu-logo img {
                max-height: 50px;
            }
        }