/* ===== 头部容器 ===== */
        .header {           
            position: relative;
    top: 0;
    z-index: 1000;
    border-bottom: 0px solid #eef2f6;
    width: 100%;
    padding: 0 6%;background:linear-gradient(0deg, #ffffff00, #dbedff);
        }

        .header-inner {
            max-width: 100%;
            margin: 0 auto;
            padding: 0px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 90px;
            position: relative;
        }

        /* ===== 左侧 Logo ===== */
        .logo {
            display: flex;
            align-items: center;
            flex-shrink: 0;
            text-decoration: none;
            gap: 10px;
        }

        .logo img {
            height: 1.8vw !important;
            width: auto;
            display: block;
        }

        .logo-text {
            font-size: 22px;
            font-weight: 700;
            color: #0b1e33;
            letter-spacing: 1px;
        }

        .logo-text span {
            color: #2563eb;
        }

        /* ===== 右侧区域 (桌面) ===== */
        .header-right {
            display: flex;
            align-items: center;
            gap: 28px;
            flex: 1;
            justify-content: flex-end;
        }

        /* ===== 导航菜单 ===== */
        .nav-menu {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 6px;
        }

        .nav-menu>li {
            position: relative;
            padding: 0 4px;
        }

        .nav-menu>li>a {
            display: flex;
            align-items: center;
            padding: 30px 16px;
            font-size: .9vw;
            font-weight: 500;
            color: #0055b8;
            text-decoration: none;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
            gap: 4px;
        }

        .nav-menu>li>a i {display: none;
            font-size: 12px;
            color: #94a3b8;
            transition: transform 0.25s;
            margin-left: 2px;
        }

        .nav-menu>li>a:hover {
            font-weight:bold;
            color: #0055b8;
        }

        .nav-menu>li>a:hover i {
            color: #2563eb;
            transform: rotate(180deg);
        }

        .nav-menu>li>a.active {
           
            color: #0055b8;
        }

        /* ===== 下拉菜单 - 全屏背景 + 内容居中 ===== */
        .dropdown {
            position: absolute;
            top: calc(100% + 0px);
            left: 50%;
            transform: translateX(-50%) translateY(6px);
            width: 122vw;                      /* 宽度撑满视口 */
            background: #e7f3ff;               /* 全屏背景色 */
            border-radius: 0px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.10);
            padding: 20px 0;
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
            border: 1px solid #f0f2f5;
            list-style: none;
            /* 内容居中 */
            display: flex;
            flex-direction: column;
            align-items: center;
            /* 重置 min-width */
            min-width: unset;
            /* 确保宽度包含 padding */
            box-sizing: border-box;
        }

        /* 普通下拉菜单项（非 grid）居中 */
        .dropdown:not(.grid-2) li {
            width: auto;
        }

        .dropdown:not(.grid-2) li a {
            white-space: nowrap;
        }

       

        .nav-menu>li:hover .dropdown {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
            transform: translateX(-50%) translateY(0);
        }

        .dropdown li a {
            display: block;
            padding: 5px 22px;
            font-size: .85vw;
            color: #666;
            text-decoration: none;
            transition: background 0.15s, color 0.15s;
            white-space: nowrap;
        }

        .dropdown li a:hover {          
            color: #2563eb;
        }

        /* ===== 核心案例 - 两列下拉（全屏背景，内容居中） ===== */
        .dropdown.grid-2 {
            display: grid;
            grid-template-columns: repeat(2, auto);
            justify-content: center;
            gap: 2px;
            padding: 12px 0px;
            width: 122vw;
            /* 覆盖默认 flex */
            align-items: start;
        }

        .dropdown.grid-2 li {
            list-style: none;
            width: auto;
        }

        .dropdown.grid-2 li a {
            padding: 10px 18px;
            border-radius: 6px;
            white-space: nowrap;
            text-align: center;
        }

        /* ===== 联系电话 ===== */
        .contact-phone {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: .9vw;
            font-weight: 500;
            color: #0055b8;
            white-space: nowrap;
            text-decoration: none;
            transition: color 0.2s;
            padding: 6px 10px;
            border-radius: 6px;
        }

        .contact-phone i {
            font-size: 18px;
            color: #0055b8;
        }

       

        /* ===== 搜索框 ===== */
        .search-wrap {
            display: flex;
            align-items: center;
            background: none;
            border-radius: 40px;
            padding: 0 4px 0 16px;
            transition: background 0.25s, box-shadow 0.25s;
            border: 1px solid #0055b8;
            flex-shrink: 0;
        }

        .search-wrap:focus-within {
            background: #ffffff;
            border-color: #2563eb;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
        }

        .search-wrap input {
            border: none;
            background: transparent;
            padding: 5px 0;
            font-size: 14px;
            color: #1e293b;
            outline: none;
            width: 140px;
            transition: width 0.3s;
            font-family: inherit;
        }

        .search-wrap input::placeholder {
            color: #94a3b8;
        }

        .search-wrap input:focus {
            width: 180px;
        }

        .search-wrap button {
            background: none;
    border: none;
    color: #0055b8;
    width: 38px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1vw;
    transition: background 0.2s, transform 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
        }     

        /* ===== 汉堡菜单按钮 (移动端) ===== */
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 44px;
            height: 44px;
            border: none;
            background: transparent;
            cursor: pointer;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            transition: background 0.2s;
            flex-shrink: 0;
        }

        .hamburger:hover {
            background: #f1f5f9;
        }

        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #1e293b;
            border-radius: 4px;
            transition: all 0.3s ease;
            transform-origin: center;
        }

        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }

        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* ===== 移动端菜单面板 ===== */
        .mobile-menu {
            display: none;
            background: #ffffff;
            border-top: 1px solid #eef2f6;
            padding: 16px 24px 28px;
            max-height: calc(100vh - 72px);
            overflow-y: auto;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
        }

        .mobile-menu.open {
            display: block;
            animation: slideDown 0.3s ease;
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-12px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .mobile-nav {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .mobile-nav>li>a {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 12px;
            font-size: 16px;
            font-weight: 500;
            color: #1e293b;
            text-decoration: none;
            border-radius: 8px;
            transition: background 0.2s;
        }

        .mobile-nav>li>a:hover,
        .mobile-nav>li>a:active {
            background: #f1f5f9;
        }

        .mobile-nav>li>a i {
            color: #94a3b8;
            font-size: 14px;
            transition: transform 0.25s;
        }

        .mobile-nav>li>a i.rotate {
            transform: rotate(180deg);
        }

        /* 移动端子菜单 */
        .mobile-dropdown {
            list-style: none;
            padding-left: 16px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            background: #f8fafc;
            border-radius: 8px;
            margin: 0 8px 0 8px;
        }

        .mobile-dropdown.open {
            max-height: 600px;
            padding: 8px 0;
        }

        .mobile-dropdown li a {
            display: block;
            padding: 12px 16px;
            font-size: 15px;
            color: #475569;
            text-decoration: none;
            border-radius: 6px;
            transition: background 0.15s, color 0.15s;
        }

        .mobile-dropdown li a:hover,
        .mobile-dropdown li a:active {
            background: #eef2f6;
            color: #2563eb;
        }

        /* 移动端 - 核心案例两列变为单列 */
        .mobile-dropdown.grid-2-mobile {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .mobile-dropdown.grid-2-mobile li a {
            text-align: left;
        }

        /* 移动端 - 电话 & 搜索 */
        .mobile-contact {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 14px 12px;
            font-size: 16px;
            font-weight: 500;
            color: #1e293b;
            text-decoration: none;
            border-radius: 8px;
            margin-top: 6px;
        }

        .mobile-contact i {
            font-size: 20px;
            color: #2563eb;
        }

        .mobile-search {
            display: flex;
            align-items: center;
            background: #f1f5f9;
            border-radius: 40px;
            padding: 0 4px 0 16px;
            margin-top: 10px;
            border: 1px solid transparent;
            transition: border-color 0.25s, box-shadow 0.25s;
        }

        .mobile-search:focus-within {
            border-color: #2563eb;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
            background: #ffffff;
        }

        .mobile-search input {
            border: none;
            background: transparent;
            padding: 12px 0;
            font-size: 15px;
            color: #1e293b;
            outline: none;
            flex: 1;
            font-family: inherit;
        }

        .mobile-search input::placeholder {
            color: #94a3b8;
        }

        .mobile-search button {
            background: #2563eb;
            border: none;
            color: #fff;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            cursor: pointer;
            font-size: 16px;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .mobile-search button:hover {
            background: #1d4ed8;
        }

        /* ===== 分隔线 ===== */
        .mobile-divider {
            height: 1px;
            background: #eef2f6;
            margin: 12px 0 10px;
        }

        /* ===== 响应式 - 平板/桌面 ===== */
        @media (max-width: 1024px) {
            .header-inner {
                padding: 0 16px;
            }
            .header-right {
                gap: 16px;
            }
            .nav-menu>li>a {
                padding: 8px 12px;
                font-size: 14px;
            }
            .search-wrap input {
                width: 100px;
            }
            .search-wrap input:focus {
                width: 130px;
            }
        }

        @media (max-width: 900px) {
            .header-right .nav-menu,
            .header-right .contact-phone,
            .header-right .search-wrap {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .header-inner {
                height: 64px;
            }

            .logo img {
                height: 34px;
            }

            .logo-text {
                font-size: 18px;
            }

            .mobile-menu {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: #ffffff;
                border-top: 1px solid #eef2f6;
                padding: 12px 16px 24px;
                box-shadow: 0 16px 48px rgba(0, 0, 0, 0.10);
                max-height: calc(100vh - 64px);
                overflow-y: auto;
            }

            .mobile-menu.open {
                display: block;
            }
        }

        /* ===== 极小屏优化 ===== */
        @media (max-width: 760px) {
            .header {
    position: relative;
    top: 0;
    z-index: 1000;
    border-bottom: 0px solid #eef2f6;
    width: 100%;
    padding: 0 4%;
    background: linear-gradient(0deg, #ffffff00, #dbedff);
}
            .header-inner {
                padding: 2vw 0px;
                height: auto;
            }

            .logo img {
                height: 5vw !important;
            }

            .logo-text {
                font-size: 16px;
            }

            .hamburger {
                width: 38px;
                height: 38px;
                padding: 6px;
            }

            .hamburger span {
                width: 22px;
                height: 2px;
            }

            .mobile-menu {
                top: 58px;
                padding: 8px 12px 20px;
                max-height: calc(100vh - 58px);
            }

            .mobile-nav>li>a {
                padding: 12px 10px;
                font-size: 15px;
            }

            .mobile-dropdown li a {
                padding: 10px 14px;
                font-size: 14px;
            }

            .mobile-search input {
                padding: 10px 0;
                font-size: 14px;
            }

            .mobile-search button {
                width: 36px;
                height: 36px;
                font-size: 14px;
            }

            .contact-phone {
                font-size: 13px;
            }
        }

        /* ===== 滚动条美化 ===== */
        .mobile-menu::-webkit-scrollbar {
            width: 4px;
        }

        .mobile-menu::-webkit-scrollbar-track {
            background: transparent;
        }

        .mobile-menu::-webkit-scrollbar-thumb {
            background: #d1d5db;
            border-radius: 8px;
        }