* { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: "Microsoft YaHei", "SimHei", sans-serif; color: #333; background: #efefef; }
        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            width: 100%;
        }


       .twoNav {
           z-index: 150;
           position: fixed;
           top: 0;
           left: 0;
           height:180px;
           width: 100%;
           background-color: transparent;
           /*transition: background 0.3s;*/
           
           background-color: #004080;
           border-bottom:5px solid #f1c40f;
           box-shadow: 0 20px 20px rgb(0 0 0 / 25%);
       }

 
        /* ===== 顶部导航 - 透明叠加在大图上 ===== */
        .top-bar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 200;
            padding:25px 0px;
            transition: background 0.3s;
        }
        .top-bar.scrolled {
            background: transparent;
        }
        .top-bar .container {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            height: 100%;
            padding: 0 20px;
            max-width:1400px;
        }
        .top-bar a {
            color: #fff;
            font-size: 12px;
            margin-left: 12px;
            transition: opacity 0.3s;
        }
        .top-bar a:hover { opacity: 0.8; text-decoration: underline; }
        .top-bar span { color: rgba(255,255,255,0.4); font-size: 12px; margin-left: 12px; }

        .short-line {
            width: 20px;
            height: 1px;
            background:rgba(255,255,255,0.3);
            margin:10px;
        }

        .icon-row {
            display: flex;
            align-items: flex-start;
        }
        .icon-item {
            text-align: center;
            cursor: pointer;
        }
        .icon-circle {
            width: 25px;
            height: 25px;
            border-radius: 50%;
            background: rgba(255,255,255,0);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 10px;
            transition: all 0.3s;
            border: 1px solid #e0e0e0;
        }
        .icon-circle svg {
            width: 15px;
            height: 15px;
            fill: #fff;
            transition: fill 0.3s;
        }
        .icon-item:hover .icon-circle {
            background: #8B1A1A;
            border-color: #8B1A1A;
            transform: translateY(-3px);
            box-shadow: 0 6px 16px rgba(139,26,26,0.25);
        }
        .icon-item:hover .icon-circle svg {
            fill: #fff;
        }
        .icon-item p {
            font-size: 13px;
            color: #666;
            transition: color 0.3s;
            line-height: 1.4;
        }
        .icon-item:hover p {
            color: #8B1A1A;
        }

        /* ===== 主导航 - 透明叠加在大图上 ===== */
        .main-nav {
            position: fixed;
            top: 60px;
            left: 0;
            right: 0;
            height: 70px;
            z-index: 0;
            /*border-bottom:1px solid rgba(255,255,255,0.1);*/
            padding:40px 0px 40px 0px;
            transition: background 0.3s, position 0.3s;            
        }
        .main-nav.scrolled {
            background: transparent;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .main-nav.fixed .top-bar-inside {
            display: none;
        }

   
        .main-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            position: relative;            
            max-width:1400px;
        }
        .nav-left, .nav-right {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .nav-left { justify-content: flex-start; }
        .nav-right { justify-content: flex-end; }
        .nav-center {
            display: flex;
            align-items: center;
            margin: 0 20px;
            color: #fff;
        }
        .nav-center .logo-circle {
            width: 40px;
            height: 40px;
            border: 2px solid #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            margin-right: 10px;
        }
        .nav-center .logo-text h1 { font-size: 16px; font-weight: bold; }
        .nav-center .logo-text p { font-size: 10px; opacity: 0.8; }

        .nav-item {
            position: relative;
            color: #fff;
            font-size: 18px;
            cursor: pointer;
            padding: 10px 16px;

            transition: opacity 0.3s;
            font-weight:bold;
        }
        .nav-item:hover { 
         opacity: 0.9;
         background-color: rgba(255,255,255,0.15); 
         padding: 10px 16px;

        transition: all 0.3s;
       }
        .nav-item .sub-nav {
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            background: #fff;
            min-width: 120px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            padding: 10px 0px;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 300;
            border-top:#f1c40f 3px solid;
        }
        .nav-item:hover .sub-nav {
            opacity: 1;
            visibility: visible;
            top: calc(100% + 5px);
        }
        .nav-item .sub-nav a {
            display: block;
            padding: 15px 10px;
            font-size: 14px;
            color: #333;
            transition: all 0.2s;
            border-bottom:#efefef 1px solid;
            text-align:center;
        }
        .nav-item .sub-nav a:hover {
            background: #f5f5f5;
            color: #8B1A1A;
        }


 /* 三角颠倒方向 */
.nav-arrow {
    /*display: inline-block;*/
    transition: transform 0.3s;
    font-size: 12px;
    margin-left: 5px;
    justify-content: center;
    align-items: center;
}
.nav-item:hover .nav-arrow {
    transform: rotate(180deg); 
}
.col_bac{
        background-image: url('../images/mjj_line.png');
        height:175px;
}

        /* 移动端菜单按钮 */
        .mobile-menu-btn {
            display: none;
            flex-direction: column;
           justify-content: center;
            align-items: center;
            width: 30px;
            height: 30px;
            cursor: pointer;
            z-index: 500;
            position: relative;
            margin-top:-12px;
        }
        .mobile-menu-btn span {
            display: block;
            width: 24px;
            height: 2px;
            background: #fff;
            margin: 3px 0;
            transition: all 0.3s;
        }
        .mobile-menu-btn.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .mobile-menu-btn.active span:nth-child(2) {
            opacity: 0;
        }
        .mobile-menu-btn.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }


/* ===== 全屏搜索遮罩层 ===== */
        .search-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background: rgba(0, 0, 0, 0.8);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 11000;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.4s ease, visibility 0.4s ease;
        }

        .search-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        .search-overlay-content {
            width: 600px;
            max-width: 90%;
            position: relative;
        }

        .overlay-search-box {
            display: flex;
            align-items: center;
            background: #fff;
            border-radius: 50px;
            padding: 6px 6px 6px 24px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.3);
            transition: box-shadow 0.3s ease;
        }

        .overlay-search-box:focus-within {
            box-shadow: 0 10px 50px rgba(0,0,0,0.5), 0 0 0 3px rgba(26, 58, 92, 0.3);
        }

        .overlay-search-box input[type="text"] {
            flex: 1;
            border: none;
            outline: none;
            font-size: 18px;
            color: #333;
            padding: 12px 0;
            background: transparent;
        }

        .overlay-search-box input[type="text"]::placeholder {
            color: #999;
        }

        .overlay-search-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: #1a3a5c;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.3s ease, transform 0.2s ease;
            flex-shrink: 0;
        }

        .overlay-search-btn:hover {
            background: #2a4a6c;
            transform: scale(1.05);
        }

        .overlay-search-btn svg {
            width: 22px;
            height: 22px;
            fill: #fff;
        }

        /* 关闭按钮 */
        .overlay-close {
            position: absolute;
            top: -60px;
            right: 0;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.5);
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.3s ease;
        }

        .overlay-close:hover {
            background: rgba(255,255,255,0.8);
        }

        .overlay-close svg {
            width: 20px;
            height: 20px;
            fill: #fff;
        }

        /* 提示文字 */
        .overlay-hint {
            text-align: center;
            color: rgba(255,255,255,0.6);
            margin-top: 20px;
            font-size: 14px;
            letter-spacing: 2px;
        }

        /* ===== 页面内容（用于演示滚动） ===== */
        .page-content {
            padding: 40px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .page-content h1 {
            color: #1a3a5c;
            margin-bottom: 20px;
        }

        .page-content p {
            line-height: 2;
            color: #666;
            margin-bottom: 16px;
        }

        .demo-section {
            background: #fff;
            padding: 30px;
            margin-bottom: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }

        .demo-section h2 {
            color: #1a3a5c;
            margin-bottom: 15px;
            border-left: 4px solid #1a3a5c;
            padding-left: 12px;
        }

        /* 滚动条样式 */
        ::-webkit-scrollbar {
            width: 8px;
        }

        ::-webkit-scrollbar-track {
            background: #f1f1f1;
        }

        ::-webkit-scrollbar-thumb {
            background: #c1c1c1;
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: #a1a1a1;
        }




 












      

        /* ===== 快捷入口 ===== */
        .quick-links {
            padding: 60px 20px;
            background: #efefef;
            margin-top:-180px;
        }
        .quick-links .container {
            display: flex;
            justify-content: center;
            gap:105px;
            flex-wrap: wrap;
        }
        .quick-item {
            text-align: center;
            cursor: pointer;
        }
        .quick-item .quick-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 10px;
            font-size: 30px;
            color: #555;
            transition: all 0.3s;
            border:1px solid #e9e7e7;
        }
        .quick-item:hover .quick-icon {
            background: #8B1A1A;
            color: #fff;
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(139,26,26,0.3);
        }
        .quick-item p {
            font-size: 13px;
            color: #666;
            transition: color 0.3s;
        }
        .quick-item:hover p { color: #8B1A1A; }

        /* ===== 页脚 ===== */
        .footer {
            background: #004080;
            padding: 30px 0px 0px 0px;
            color: #fff;
            border-top:5px solid #f1c40f;
        }
        .footer .container {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
           max-width:1400px;
        }
        .footer-top {
            display: flex;
            align-items: flex-start;
            gap: 40px;
           
            width: 100%;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 15px;
            flex-shrink: 0;
        }
        .footer-logo .logo-circle {
            width: 50px;
            height: 50px;
            border: 2px solid #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
        }
        .footer-logo h3 { font-size: 16px; }
        .footer-logo p { font-size: 10px; opacity: 0.7; }
        .footer-info {
            font-size: 12px;
            line-height: 2.5;
            color: rgba(255,255,255,0.8);
            text-align: right;
            flex: 1;
        }        
         .footer-info p {
            font-size: 12px;
        }
        .footer-bottom {
            text-align: center;
            font-size: 12px;
            color: #fff;
            padding: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            width: 100%;
        }



        /* ===== 响应式 ===== 
        @media (max-width: 1200px) {
            .nav-left, .nav-right { gap: 20px; }
            .nav-center { margin: 0 30px; }
            .quick-links .container { gap: 40px; }
        }
        @media (max-width: 992px) {
            .main-nav { height: auto; padding: 10px 0; justify-content: center;  align-items: center;   }
            .main-nav .container { flex-wrap: wrap; gap: 10px; }
            .nav-left, .nav-right { gap: 15px; flex-wrap: wrap; justify-content: center; }
            .nav-center { margin: 0 20px; order: -1; width: 100%; justify-content: center; }
            .footer-top { flex-direction: column; }
            .footer-info { text-align: center; }
        }
        @media (max-width: 768px) {
            .top-bar .container { justify-content: center; }
            .nav-item { font-size: 12px; }
            .nav-center .logo-text h1 { font-size: 14px; }

            .quick-links .container { gap: 25px; }
            .quick-item .quick-icon { width: 44px; height: 44px; font-size: 16px; }
            .quick-item p { font-size: 12px; }
            .footer-info { font-size: 11px; }
        }
        @media (max-width: 1100px) {
            .mobile-menu-btn {
                display: flex;
            }
            .nav-left, .nav-right {
                display: none;
                position: fixed;
                top: 0;
                right: 0;
                width: 280px;
                height: 100vh;
                background: #2c3e50;
                flex-direction: column;
                padding: 80px 20px 20px;
                gap: 0;
                z-index: 400;
                overflow-y: auto;
                justify-content: flex-start;
                align-items: flex-end;
            }
            .nav-left.active, .nav-right.active {
                display: flex;
            }
            .nav-item {
                font-size: 16px;
                padding: 15px 0;
                border-bottom: 1px solid rgba(255,255,255,0.1);
                width: 100%;
                text-align: right;
            }
            .nav-item .sub-nav {
                position: static;
                transform: none;
                opacity: 1;
                visibility: visible;
                background: transparent;
                box-shadow: none;
                border-top: none;
                padding: 5px 0;
                display: none;
            }
            .nav-item .sub-nav.active {
                display: block;
            }
            .nav-item .sub-nav a {
                color: rgba(255,255,255,0.8);
                text-align: right;
                border-bottom: none;
                padding: 8px 0;
            }
            .nav-item .sub-nav a:hover {
                background: transparent;
                color: #fff;
            }
            .nav-center {
                margin: -50px 0px;
                order: -1; width: 100% !important; 
                justify-content: center; 
               margin: -50px 0 10px 0; 
               flex: none;
            }
            .main-nav .container {
                flex-wrap: wrap;
            }
            .mobile-icons {
                order: 0;
            }
            .mobile-menu-btn {
                order: 1;
            }
            .main-nav .container {
                justify-content: center;
            }
            .top-bar .icon-row {
                display: none;
            }
            .mobile-icons {
                display: flex;
                gap: 15px;
                margin-right: 15px;
            }
            .mobile-icons .icon-circle {
                width: 30px;
                height: 30px;
            }
            .mobile-icons .icon-circle svg {
                width: 16px;
                height: 16px;
                fill: #fff;
            }
        }
        @media (min-width: 1101px) {
            .mobile-icons {
                display: none;
            }
        }
        @media (max-width: 600px) {
            .main-nav .container {
                flex-wrap: wrap;
            }
            .nav-center {
                order: -1 !important;
                width: 100% !important;
                justify-content: center;
                margin-bottom: 10px;
            }
            .mobile-icons {
                order: 0;
            }
            .mobile-menu-btn {
                order: 1;
            }
        }
        @media (max-width: 480px) {
            .hero-content h2 { font-size: 24px; }
            .section-title { font-size: 20px; }
            .work-left .work-img { height: 200px; }
            .notice-item { flex-direction: column; gap: 8px; }
            .notice-date { display: flex; align-items: center; gap: 8px; }
            .notice-date .num { font-size: 20px; }
        }*/