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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: #f5f7fa;
            color: #333;
        }

        /* ===== 顶部导航�?===== */
        .header {
            background: #fff;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            padding: 0 40px;
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, #1a73e8, #0d47a1);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: bold;
            font-size: 18px;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #0d47a1;
        }

        .logo-text span {
            color: #1a73e8;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-menu a {
            text-decoration: none;
            color: #555;
            font-size: 15px;
            font-weight: 500;
            transition: color 0.2s;
        }

        .nav-menu a:hover {
            color: #1a73e8;
        }

        .nav-menu a.active {
            color: #1a73e8;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-outline {
            padding: 8px 20px;
            border: 1.5px solid #1a73e8;
            color: #1a73e8;
            background: transparent;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-outline:hover {
            background: #1a73e8;
            color: #fff;
        }

        .btn-primary {
            padding: 8px 24px;
            background: #1a73e8;
            color: #fff;
            border: none;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.2s;
        }

        .btn-primary:hover {
            background: #0d47a1;
        }

        /* ===== Hero 区域 ===== */
        .hero {
            padding: 0;
            display: flex;
            justify-content: center;
        }

        .hero-banner {
            width: 100%;
            max-width: 1920px;
            height: auto;
            display: block;
            cursor: pointer;
        }

        .hero-content {
            flex: 1;
            min-width: 300px;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(26, 115, 232, 0.12);
            color: #1a73e8;
            font-size: 13px;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 20px;
            margin-bottom: 16px;
        }

        .hero h1 {
            font-size: 36px;
            font-weight: 800;
            color: #0d1b3e;
            line-height: 1.2;
            margin-bottom: 8px;
        }

        .hero .subtitle {
            font-size: 20px;
            font-weight: 600;
            color: #1a73e8;
            margin-bottom: 12px;
        }

        .hero .desc {
            font-size: 15px;
            color: #555;
            margin-bottom: 24px;
            line-height: 1.6;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .hero-actions .btn-primary {
            padding: 12px 36px;
            font-size: 16px;
            border-radius: 8px;
            box-shadow: 0 4px 14px rgba(26, 115, 232, 0.35);
        }

        .hero-actions .btn-primary:hover {
            box-shadow: 0 6px 20px rgba(26, 115, 232, 0.45);
            transform: translateY(-2px);
        }

        .hero-actions .btn-outline {
            padding: 12px 28px;
            font-size: 15px;
            border-radius: 8px;
        }

        .hero-image {
            flex: 1;
            min-width: 280px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-image img {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }

        .hero-image .placeholder-img {
            width: 100%;
            max-width: 400px;
            height: 220px;
            background: linear-gradient(135deg, #b3d0f7, #8bb3f0);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 500;
            box-shadow: 0 8px 30px rgba(26, 115, 232, 0.15);
        }

        /* ===== 服务产品/项目 ===== */
        .section-title {
            text-align: center;
            font-size: 28px;
            font-weight: 700;
            color: #0d1b3e;
            margin-bottom: 8px;
        }

        .section-subtitle {
            text-align: center;
            color: #888;
            font-size: 15px;
            margin-bottom: 32px;
        }

        .services-section {
            padding: 50px 40px 20px;
        }

        .services-grid {
            display: grid;
            grid-template-columns: 1fr repeat(4, 1fr);
            grid-template-rows: repeat(3, 1fr);
            gap: 16px;
            max-width: 1060px;
            margin: 0 auto;
        }

        .service-card-large {
            grid-row: span 3;
            border-radius: 12px;
            overflow: hidden;
            position: relative;
        }

        .service-card-large .card-image {
            height: 100%;
        }

        .service-card-large .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .service-card-large .card-info {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(26, 115, 232, 0.95), rgba(26, 115, 232, 0.8));
            padding: 24px;
            color: #fff;
        }

        .service-card-large .card-info p {
            font-size: 14px;
            line-height: 1.6;
            margin: 0;
        }

        .service-card-small {
            border-radius: 12px;
            overflow: hidden;
            position: relative;
            cursor: pointer;
            transition: transform 0.2s;
        }

        .service-card-small:hover {
            transform: translateY(-4px);
        }

        .service-card-small .card-image {
            height: 120px;
        }

        .service-card-small .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .service-card-small .card-label {
            background: #1a73e8;
            color: #fff;
            padding: 10px 12px;
            font-size: 13px;
            font-weight: 500;
            text-align: center;
        }

        .service-card-small .card-label-orange {
            background: #ff6b35;
        }

        /* ===== 测试项目 ===== */
        .test-section {
            padding: 40px 40px 20px;
        }

        .test-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 16px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .test-item {
            background: #fff;
            border-radius: 10px;
            padding: 18px 12px;
            text-align: center;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
            transition: box-shadow 0.2s;
            cursor: default;
        }

        .test-item:hover {
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
        }

        .test-item .icon {
            font-size: 28px;
            display: block;
            margin-bottom: 6px;
        }

        .test-item .label {
            font-size: 14px;
            font-weight: 500;
            color: #333;
        }

        .test-item .badge {
            font-size: 11px;
            color: #1a73e8;
            background: #e8f0fe;
            padding: 1px 10px;
            border-radius: 10px;
            display: inline-block;
            margin-top: 4px;
        }

        /* ===== 服务优势 ===== */
        .service-advantage-section {
            padding: 40px 40px 20px;
            background: #fff;
        }

        .advantage-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            max-width: 1060px;
            margin: 0 auto;
        }

        .advantage-card {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
        }

        .advantage-card img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* ===== 连接区域 ===== */
        .connect-section {
            background-image: url('../images/background_connect.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            margin-top:30px;
            display: flex;
            align-items: center;
            justify-content: center;
            height: 180px;
        }

        .connect-content {
            width: 100%;
            max-width: 1200px;
            display: flex;
            justify-content: center;
        }

        .connect-text {
            width: 100%;
            height: auto;
        }

        /* ===== 服务流程 ===== */
        .service-flow-section {
            padding: 40px 40px 20px;
            background: #fff;
        }

        .service-flow {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 50px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .flow-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
            flex: 0 0 auto;
        }

        .flow-icon {
            width: 68px;
            height: 68px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .flow-icon.blue {
            background: #1a73e8;
        }

        .flow-icon.orange {
            background: #ff6b35;
        }

        .flow-text {
            font-size: 14px;
            color: #333;
            text-align: center;
            line-height: 1.5;
            font-weight: 500;
        }

        .flow-arrow {
            color: #ccc;
            font-size: 20px;
            font-weight: 300;
            margin: 0 4px;
        }

        /* ===== 常见问题 ===== */
        .faq-section {
            padding: 40px 40px 50px;
            background: #fff;
        }

        .faq-content {
            display: flex;
            max-width: 1100px;
            margin: 0 auto;
            gap: 30px;
            align-items: flex-start;
        }

        .faq-left {
            flex: 1;
            min-width: 300px;
            position: relative;
        }

        .faq-image {
            width: 100%;
            height: auto;
            border-radius: 8px;
            display: block;
        }

        .btn-faq {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: #1a73e8;
            color: #fff;
            border: none;
            padding: 12px 36px;
            font-size: 15px;
            font-weight: 500;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
        }

        .btn-faq:hover {
            background: #0d47a1;
        }

        .faq-right {
            flex: 1.2;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .faq-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 12px 16px;
            cursor: default;
        }

        .faq-item .num {
            font-weight: 700;
            color: #1a73e8;
            font-size: 15px;
            min-width: 24px;
            flex-shrink: 0;
        }

        .faq-item .question {
            font-size: 15px;
            color: #333;
            font-weight: 500;
            margin-bottom: 4px;
        }

        .faq-item .answer {
            font-size: 13px;
            color: #777;
            line-height: 1.6;
        }

        /* ===== 底部咨询 ===== */
        .cta-bottom {
            background: linear-gradient(135deg, #0d1b3e, #1a3a7a);
            padding: 36px 40px;
            text-align: center;
            color: #fff;
        }

        .cta-bottom h3 {
            font-size: 22px;
            font-weight: 600;
            margin-bottom: 6px;
        }

        .cta-bottom p {
            font-size: 14px;
            opacity: 0.85;
            margin-bottom: 18px;
        }

        .cta-bottom .btn-primary {
            background: #fff;
            color: #0d1b3e;
            padding: 12px 48px;
            font-size: 16px;
            font-weight: 600;
            border-radius: 8px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            transition: all 0.2s;
        }

        .cta-bottom .btn-primary:hover {
            background: #f0f4ff;
            transform: scale(1.02);
        }

        /* ===== 页脚 ===== */
        .footer {
            background: #0a1329;
            color: rgba(255, 255, 255, 0.6);
            text-align: center;
            padding: 20px 40px;
            font-size: 13px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            margin: 0 10px;
        }

        .footer a:hover {
            color: #fff;
        }

        /* ===== 响应�?===== */
        @media (max-width: 768px) {
            .header {
                padding: 0 16px;
                flex-wrap: wrap;
                height: auto;
                padding-top: 12px;
                padding-bottom: 12px;
                gap: 12px;
            }

            .nav-menu {
                gap: 14px;
                flex-wrap: wrap;
            }

            .nav-menu a {
                font-size: 13px;
            }

            .header-actions .btn-outline,
            .header-actions .btn-primary {
                padding: 6px 14px;
                font-size: 12px;
            }

            .hero {
                padding: 30px 16px;
                flex-direction: column;
                text-align: center;
            }

            .hero h1 {
                font-size: 26px;
            }

            .hero .subtitle {
                font-size: 17px;
            }

            .hero-actions {
                justify-content: center;
            }

            .services-section,
            .test-section,
            .service-advantage-section,
            .service-flow-section,
            .faq-section {
                padding-left: 16px;
                padding-right: 16px;
            }

            .advantage-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .section-title {
                font-size: 22px;
            }

            .services-grid {
                grid-template-columns: repeat(2, 1fr);
                grid-template-rows: repeat(7, 1fr);
                gap: 10px;
            }

            .service-card-large {
                grid-row: span 2;
                grid-column: span 2;
            }

            .service-card-small .card-image {
                height: 80px;
            }

            .test-grid {
                grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
            }

            .comprehensive-grid {
                grid-template-columns: 1fr 1fr;
            }

            .faq-content {
                flex-direction: column;
            }

            .faq-left {
                min-width: 100%;
            }

            .btn-faq {
                padding: 10px 28px;
                font-size: 14px;
            }

            .cta-bottom {
                padding: 28px 16px;
            }

            .cta-bottom h3 {
                font-size: 18px;
            }
        }

        @media (max-width: 480px) {
            .flow-icon {
                width: 50px;
                height: 50px;
                font-size: 24px;
            }

            .flow-text {
                font-size: 12px;
            }

            .hero-image .placeholder-img {
                height: 150px;
            }
        }