/* ========== CSS 变量 - 严格遵循设计规范 ========== */
        :root {
            --deep-gray: #1A1A1F;
            --pearl-white: #F8F9FA;
            --tech-blue: #2E86AB;
            --silver-blue: #5DADEC;
            --text-dark: #333333;
            --text-light: #E0E0E0;
            --text-muted: #888888;
            --shadow-sm: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-md: 0 10px 40px rgba(0,0,0,0.12);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
            --transition: all 0.3s ease;
            --section-gap: 100px;
            --section-gap-mobile: 60px;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; font-size: 16px; }

        body {
            font-family: 'Roboto', 'Noto Sans SC', 'PingFang SC', sans-serif;
            background-color: var(--pearl-white);
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        /* ========== 栅格系统 ========== */
        .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; width: 100%; }
        .row { display: flex; flex-wrap: wrap; margin: 0 -15px; }
        .col { flex: 1 0 0%; padding: 0 15px; }
        .col-12 { flex: 0 0 100%; max-width: 100%; }
        .col-6 { flex: 0 0 50%; max-width: 50%; }
        .col-4 { flex: 0 0 33.333%; max-width: 33.333%; }
        .col-3 { flex: 0 0 25%; max-width: 25%; }

        @media (max-width: 992px) {
            .col-md-6 { flex: 0 0 50%; max-width: 50%; }
            .col-md-12 { flex: 0 0 100%; max-width: 100%; }
        }
        @media (max-width: 768px) {
            .col-sm-12 { flex: 0 0 100%; max-width: 100%; }
            .container { padding: 0 20px; }
        }

        /* ========== Section 通用样式 ========== */
        section { padding: var(--section-gap) 0; position: relative; }

        .section-header { text-align: center; margin-bottom: 64px; }
        .section-label {
            display: inline-block; font-size: 13px; font-weight: 500;
            color: var(--silver-blue); text-transform: uppercase;
            letter-spacing: 3px; margin-bottom: 16px;
        }
        .section-title {
            font-size: 36px; font-weight: 700; margin-bottom: 20px;
            letter-spacing: -0.5px; line-height: 1.2; color: var(--deep-gray);
        }
        .section-desc { font-size: 17px; color: var(--text-muted); max-width: 560px; margin: 0 auto; line-height: 1.7; }

        .bg-dark { background-color: var(--deep-gray); color: var(--text-light); }
        .bg-dark .section-title { color: white; }
        .bg-dark .section-desc { color: rgba(255,255,255,0.6); }

        /* ========== 按钮 ========== */
        .btn {
            display: inline-flex; align-items: center; gap: 10px;
            padding: 14px 32px; border-radius: 4px; font-weight: 500;
            font-size: 15px; text-decoration: none; transition: var(--transition);
            border: none; cursor: pointer;
        }
        .btn-primary { background-color: var(--silver-blue); color: white; }
        .btn-primary:hover { background-color: var(--tech-blue); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(93,173,236,0.35); }
        .btn-outline { background: transparent; border: 1px solid var(--silver-blue); color: var(--silver-blue); }
        .btn-outline:hover { background-color: var(--silver-blue); color: white; }

        /* ========== 导航栏 ========== */
        .navbar {
            position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
            padding: 0 40px; height: 80px; display: flex;
            align-items: center; justify-content: space-between;
            transition: var(--transition); background-color: transparent;
        }
        .navbar.scrolled { background-color: rgba(26,26,31,0.95); backdrop-filter: blur(10px); box-shadow: 0 4px 20px rgba(0,0,0,0.15); height: 70px; }
        .logo { font-size: 26px; font-weight: 700; color: white; text-decoration: none; letter-spacing: 2px; }
        .nav-links { display: flex; gap: 40px; align-items: center; }
        .nav-links a { color: rgba(255,255,255,0.85); text-decoration: none; font-weight: 400; font-size: 14px; transition: 0.3s; position: relative; letter-spacing: 0.5px; }
        .nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1px; background: var(--silver-blue); transition: width 0.3s; }
        .nav-links a:hover { color: white; }
        .nav-links a:hover::after { width: 100%; }
        .nav-cta { background: var(--silver-blue); padding: 10px 24px !important; border-radius: 4px; color: white !important; }
        .nav-cta::after { display: none !important; }
        .nav-cta:hover { background: var(--tech-blue); }
        .search-icon { color: white; font-size: 18px; cursor: pointer; transition: 0.3s; margin-left: 20px; }
        .search-icon:hover { color: var(--silver-blue); }
        .hamburger { display: none; font-size: 22px; color: white; cursor: pointer; z-index: 1002; width: 44px; height: 44px; align-items: center; justify-content: center; }
        .mobile-menu { position: fixed; top: 0; right: -320px; width: 300px; height: 100%; background-color: var(--deep-gray); z-index: 1001; padding: 80px 28px 40px; transition: right 0.3s ease; }
        .mobile-menu.open { right: 0; }
        .mobile-menu a { display: block; color: rgba(255,255,255,0.8); text-decoration: none; padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,0.1); font-size: 15px; }
        .menu-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); z-index: 1000; display: none; opacity: 0; transition: opacity 0.3s; }
        .menu-overlay.show { display: block; opacity: 1; }

        /* ========== Hero ========== */
        .hero {
            min-height: 100vh; background: var(--deep-gray); display: flex;
            align-items: center; position: relative; overflow: hidden; padding: 120px 0 80px;
        }
        .hero-bg { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: radial-gradient(ellipse at 80% 20%, rgba(93,173,236,0.08) 0%, transparent 50%), radial-gradient(ellipse at 20% 80%, rgba(46,134,171,0.05) 0%, transparent 40%); pointer-events: none; }
        .hero-content { max-width: 580px; color: white; z-index: 2; position: relative; }
        .hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(93,173,236,0.15); color: var(--silver-blue); padding: 8px 16px; border-radius: 4px; font-size: 13px; font-weight: 500; margin-bottom: 32px; letter-spacing: 0.5px; }
        .hero h1 { font-size: 52px; line-height: 1.15; margin-bottom: 24px; font-weight: 700; letter-spacing: -1px; }
        .hero h1 span { color: var(--silver-blue); }
        .hero-subtitle { font-size: 18px; margin-bottom: 40px; opacity: 0.75; line-height: 1.8; max-width: 480px; }
        .hero-cta-group { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 60px; }
        .hero-stats { display: flex; gap: 48px; padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.1); }
        .hero-stat { text-align: left; }
        .hero-stat .number { font-size: 36px; font-weight: 700; color: var(--silver-blue); line-height: 1; margin-bottom: 8px; }
        .hero-stat .label { font-size: 13px; opacity: 0.6; letter-spacing: 0.5px; }
        .hero-image { position: absolute; right: 8%; top: 50%; transform: translateY(-50%); width: 42%; max-width: 520px; z-index: 1; }
        .hero-image img { width: 100%; filter: drop-shadow(0 40px 60px rgba(0,0,0,0.4)); }



        /* ========== 联系我们 ========== */
        .contact-wrapper { display: grid; grid-template-columns: 1fr 1.2fr; gap: 80px; align-items: start; }
        .contact-info h3 { font-size: 28px; margin-bottom: 20px; font-weight: 600; }
        .contact-info > p { opacity: 0.75; margin-bottom: 40px; line-height: 1.8; font-size: 15px; }
        .contact-item { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 24px; }
        .contact-item i { width: 44px; height: 44px; background: rgba(93,173,236,0.12); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: var(--silver-blue); font-size: 18px; flex-shrink: 0; }
        .contact-item div strong { display: block; margin-bottom: 4px; font-size: 14px; }
        .contact-item div span { opacity: 0.65; font-size: 14px; }
        .contact-form { background: white; padding: 40px; border-radius: 16px; box-shadow: var(--shadow-lg); }
        .form-group { margin-bottom: 20px; }
        .form-group label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 8px; color: var(--deep-gray); }
        .form-group input, .form-group textarea { width: 100%; padding: 14px 16px; border: 1px solid #e8e8e8; border-radius: 8px; font-family: inherit; font-size: 15px; transition: 0.2s; background: #fafafa; }
        .form-group input:focus, .form-group textarea:focus { border-color: var(--silver-blue); outline: none; background: white; box-shadow: 0 0 0 3px rgba(93,173,236,0.1); }
        .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
        .form-hint { margin-top: 16px; font-size: 12px; text-align: center; opacity: 0.5; }
        .success-msg { margin-top: 16px; color: var(--silver-blue); text-align: center; font-size: 14px; }

        /* ========== Footer ========== */
        footer { background-color: var(--deep-gray); color: var(--text-light); padding: 80px 0 40px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 60px; margin-bottom: 60px; }
        .footer-brand .footer-logo { font-size: 26px; font-weight: 700; margin-bottom: 20px; display: inline-block; letter-spacing: 2px; }
        .footer-brand p { opacity: 0.65; margin-bottom: 24px; line-height: 1.8; font-size: 14px; }
        .social-links { display: flex; gap: 12px; }
        .social-links a { width: 100%; height: auto; background: rgba(255,255,255,0.08); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: white; text-decoration: none; transition: 0.3s; font-size: 15px; }
        .social-links a:hover { background: var(--silver-blue); transform: translateY(-2px); }
        .footer-col h4 { font-size: 14px; margin-bottom: 24px; color: white; font-weight: 600; letter-spacing: 0.5px; }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 12px; }
        .footer-col a { color: rgba(255,255,255,0.55); text-decoration: none; font-size: 14px; transition: 0.3s; }
        .footer-col a:hover { color: var(--silver-blue); }
        .footer-contact p { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; font-size: 14px; opacity: 0.7; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 30px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; font-size: 13px; opacity: 0.5; }

        /* ========== 悬浮按钮 ========== */
        .float-contact { position: fixed; bottom: 30px; right: 30px; z-index: 999; background: var(--silver-blue); width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: white; font-size: 22px; cursor: pointer; box-shadow: 0 8px 24px rgba(93,173,236,0.4); transition: var(--transition); }
        .float-contact:hover { transform: scale(1.1); background: var(--tech-blue); box-shadow: 0 12px 32px rgba(93,173,236,0.5); }

        /* ========== 响应式 ========== */
        @media (max-width: 1200px) {
            .hero h1 { font-size: 44px; }
            .hero-image { width: 38%; }
            .cert-grid { grid-template-columns: repeat(3, 1fr); }
        }
        @media (max-width: 992px) {
            .nav-links { display: none; }
            .hamburger { display: flex; }
            .hero { min-height: auto; padding: 140px 0 80px; text-align: center; }
            .hero-content { max-width: 100%; margin: 0 auto; }
            .hero h1 { font-size: 38px; }
            .hero-subtitle { margin: 0 auto 40px; }
            .hero-cta-group { justify-content: center; }
            .hero-stats { justify-content: center; }
            .hero-image { position: relative; width: 70%; max-width: 400px; margin: 60px auto 0; right: auto; top: auto; transform: none; }
            .section-title { font-size: 30px; }
            .scene-grid { grid-template-columns: repeat(2, 1fr); }
            .cert-grid { grid-template-columns: repeat(2, 1fr); }
            .contact-wrapper { grid-template-columns: 1fr; gap: 48px; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .advantages-row { flex-wrap: wrap; }
            .advantage-item { flex: 1 1 calc(33% - 20px); }
        }
        @media (max-width: 768px) {
            section { padding: var(--section-gap-mobile) 0; }
            .hero h1 { font-size: 32px; }
            .hero-stats { flex-direction: column; gap: 24px; align-items: center; }
            .hero-stat { text-align: center; }
            .scene-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .news-item { flex-direction: column; }
            .news-img { width: 100%; height: 180px; }
            .form-row { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; text-align: center; }
            .social-links { justify-content: center; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .timeline { flex-wrap: wrap; }
            .milestone { flex: 1 1 45%; }
            .about-image-wrapper { padding-left: 0; margin-top: 40px; }
            .cert-grid { grid-template-columns: 1fr; }
            .advantages-row { flex-direction: column; }
            .advantage-item { flex: 1; }
            .float-contact { bottom: 20px; right: 20px; width: 48px; height: 48px; font-size: 18px; }
        }
        .text-center { text-align: center; }
        /* Banner 图 */
        .banner-img {
            width: 100%;
            height: auto;
            max-height: 400px;
            object-fit: cover;
            display: block;
        }

        /* 面包屑样式 */
        .breadcrumb {
            padding: 16px 0;
            background: var(--white);
            border-bottom: 1px solid #eee;
        }

        /*////补充样式20260519*/
        .a-no-style{all: unset; /* 清除所有默认样式 */cursor: pointer;/* 可选：保留手型光标 */}

        /* 每个导航项 + 下拉容器 */
        .nav-item {
            position: relative;
            list-style: none;
        }

        /* 一级链接样式 —— 黑色背景下的亮色文字 */
        .nav-item > a {
            text-decoration: none;
            color: #e0e8f2;
            font-weight: 500;
            font-size: 1rem;
            padding: 0.4rem 0;
            border-bottom: 2px solid transparent;
            transition: color 0.2s, border-color 0.2s;
            display: inline-block;
            white-space: nowrap;
        }

        .nav-item > a:hover,
        .nav-item > a.nactive {
            color: #8ab4ff;
            border-bottom-color: #4a80e0;
        }

        /* ----- 下拉菜单 (深色风格) ----- */
        .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 190px;
            background: #171b24;          /* 深色下拉背景 */
            border-radius: 14px;
            box-shadow: 0 14px 36px rgba(0, 0, 0, 0.7);
            padding: 0.5rem 0;
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
            border: 1px solid #2d333e;
            backdrop-filter: blur(2px);
        }

        .nav-item:hover .dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0px);
        }

        /* 下拉菜单链接 */
        .dropdown-menu a {
            display: block;
            padding: 0.55rem 1.5rem;
            color: #d6dfec;
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 450;
            transition: background 0.15s, color 0.15s;
            border-left: 3px solid transparent;
        }

        .dropdown-menu a:hover {
            background: #262d3a;
            color: #ffffff;
            border-left-color: #4a80e0;
        }

        /* ----- 搜索框 (深色适配) ----- */
        .nav-links form {
            display: flex;
            align-items: center;
            background: #1f2530;
            border-radius: 40px;
            padding: 0.2rem 0.2rem 0.2rem 1.2rem;
            transition: background 0.2s, box-shadow 0.2s;
            border: 1px solid #313844;
        }
        .nav-links form:focus-within {
            background: #262d3a;
            border-color: #4a80e0;
            box-shadow: 0 0 0 3px #1a4b8a40;
        }
        .nav-links form input[type="text"] {
            border: none;
            background: transparent;
            padding: 0.45rem 0.2rem;
            font-size: 0.9rem;
            width: 120px;
            outline: none;
            color: #f0f4fe;
        }
        .nav-links form input[type="text"]::placeholder {
            color: #8a95a8;
        }

        .search-icon {
            color: #b0bed0;
            font-size: 1.1rem;
            padding: 0.45rem 0.9rem;
            border-radius: 40px;
            cursor: pointer;
            transition: background 0.2s, color 0.2s;
        }
        .search-icon:hover {
            background: #2d3545;
            color: #ffffff;
        }
        .nav-links .search-icon {
            margin-left: 0.2rem;
        }




        /* ----- 移动端菜单项 ----- */
        .mobile-nav-item {
            border-bottom: 1px solid #eee;
        }

        .mobile-nav-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.5rem 0;
        }

        .mobile-nav-link {
            flex: 1;
            text-decoration: none;
            color: #333;
            font-size: 1.2rem;
        }

        .mobile-toggle {
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0 0.5rem;
            user-select: none;
            color: #888;
            transition: transform 0.3s;
        }

        /* 展开状态：旋转符号（+ 变为 -） */
        .mobile-nav-item.open .mobile-toggle {
            transform: rotate(45deg);  /* 将 + 旋转45度变成 ×，或直接改变内容 */
        }

        /* 子菜单容器 - 默认隐藏 */
        .mobile-sub-menu {
            display: none;
            flex-direction: column;
            padding-left: 1.2rem;
            background: #f9f9f9;
            border-radius: 0 0 8px 8px;
            margin-bottom: 0.2rem;
        }

        .mobile-sub-menu a {
            padding: 0.5rem 0;
            text-decoration: none;
            color: #555;
            font-size: 1rem;
            border-bottom: 1px solid #eee;
        }

        .mobile-sub-menu a:last-child {
            border-bottom: none;
        }

        /* 展开时显示子菜单 */
        .mobile-nav-item.open .mobile-sub-menu {
            display: flex;
        }