* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        :root {
            --primary-dark: #0B3B5B;
            --primary-blue: #1E3A6F;
            --tech-blue: #2D7EE9;
            --gold: #D4AF37;
            --orange: #F5A623;
            --bg-light: #F5F7FA;
            --text-dark: #333;
            --text-gray: #666;
            --white: #fff;
            --shadow: 0 2px 8px rgba(0,0,0,0.1);
            --shadow-hover: 0 4px 16px rgba(0,0,0,0.15);
        }
        
        body {
            font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background-color: var(--bg-light);
        }
        
        /* 导航栏 */
        header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        
        nav {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            color: var(--white);
            text-decoration: none;
            font-size: 1.25rem;
            font-weight: 600;
        }
        
        .logo svg {
            width: 40px;
            height: 40px;
        }
        
        .logo img {
            width: auto;
            height: 50px;
            filter: brightness(0) invert(1);
        }
        
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 8px;
        }
        
        .nav-menu a {
            color: rgba(255,255,255,0.9);
            text-decoration: none;
            padding: 8px 16px;
            border-radius: 6px;
            transition: all 0.3s ease;
            font-size: 0.95rem;
        }
        
        .nav-menu a:hover,
        .nav-menu a.active {
            background: rgba(255,255,255,0.15);
            color: var(--white);
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--white);
            cursor: pointer;
            padding: 8px;
        }
        
        .mobile-contact {
            display: none;
        }
        
        .mobile-buttons {
            display: none;
        }
        
        /* 页面标题区 */
        .page-header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
            padding: 80px 20px;
            text-align: center;
            color: var(--white);
        }
        
        .page-header h1 {
            font-size: 2.5rem;
            margin-bottom: 15px;
            font-weight: 600;
        }
        
        .page-header p {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 600px;
            margin: 0 auto;
        }
        
        /* 通用区域样式 */
        .section {
            padding: 80px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 2.25rem;
            color: var(--primary-dark);
            margin-bottom: 12px;
            font-weight: 600;
        }
        
        .section-title p {
            color: var(--text-gray);
            font-size: 1.1rem;
        }
        
        /* 研究院介绍 */
        .about-intro {
            background: var(--white);
        }
        
        .intro-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        
        .intro-text h3 {
            font-size: 1.75rem;
            color: var(--primary-dark);
            margin-bottom: 20px;
        }
        
        .intro-text p {
            color: var(--text-gray);
            line-height: 1.9;
            margin-bottom: 20px;
        }
        
        .intro-stats {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 30px;
        }
        
        .stat-item {
            background: var(--bg-light);
            padding: 20px;
            border-radius: 10px;
            text-align: center;
        }
        
        .stat-number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--tech-blue);
            display: block;
        }
        
        .stat-label {
            color: var(--text-gray);
            font-size: 0.9rem;
            margin-top: 5px;
        }
        
        .intro-visual {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
            border-radius: 16px;
            padding: 40px;
            color: white;
            position: relative;
            overflow: hidden;
        }
        
        .intro-visual::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: 
                linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
            background-size: 30px 30px;
        }
        
        .intro-visual h4 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            position: relative;
        }
        
        .intro-visual ul {
            list-style: none;
            position: relative;
        }
        
        .intro-visual li {
            padding: 10px 0;
            padding-left: 30px;
            position: relative;
        }
        
        .intro-visual li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 18px;
            height: 18px;
            background: var(--gold);
            border-radius: 50%;
        }
        
        .intro-visual li::after {
            content: '✓';
            position: absolute;
            left: 4px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--primary-dark);
            font-size: 0.75rem;
            font-weight: bold;
        }
        
        /* 资质荣誉 */
        .certifications {
            background: var(--bg-light);
        }
        
        .cert-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
        }
        
        .cert-card {
            background: var(--white);
            border-radius: 12px;
            padding: 35px 25px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
        }
        
        .cert-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        
        .cert-badge {
            width: 90px;
            height: 90px;
            margin: 0 auto 20px;
        }
        
        .cert-badge svg {
            width: 100%;
            height: 100%;
        }
        
        .cert-card h3 {
            font-size: 1.1rem;
            color: var(--primary-dark);
            margin-bottom: 10px;
        }
        
        .cert-card p {
            color: var(--text-gray);
            font-size: 0.9rem;
        }
        
        /* 团队风采 */
        .team {
            background: var(--white);
        }
        
        .team-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 30px;
        }
        
        .team-card {
            background: var(--white);
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            border: 1px solid #e8ecf1;
        }
        
        .team-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        
        .team-avatar {
            width: 100px;
            height: 100px;
            margin: 0 auto 20px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            color: var(--white);
            font-weight: 600;
        }
        
        .team-avatar.member1 { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
        .team-avatar.member2 { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
        .team-avatar.member3 { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
        .team-avatar.member4 { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
        .team-avatar.member5 { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
        .team-avatar.member6 { background: linear-gradient(135deg, #30cfd0 0%, #330867 100%); }
        
        .team-card h3 {
            font-size: 1.2rem;
            color: var(--primary-dark);
            margin-bottom: 6px;
        }
        
        .team-card .position {
            color: var(--tech-blue);
            font-size: 0.95rem;
            margin-bottom: 10px;
        }
        
        .team-card .research {
            color: var(--text-gray);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        
        /* 核心检测项目 */
        .projects {
            background: var(--white);
        }
        
        .project-tabs {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        
        .tab {
            padding: 12px 24px;
            background-color: #f5f5f5;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-gray);
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .tab.active {
            background-color: var(--primary-blue);
            color: white;
        }
        
        .tab:hover {
            background-color: #e8e8e8;
            transform: translateY(-2px);
        }
        
        .project-content {
            margin-bottom: 20px;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .project-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .project-card {
            background: var(--white);
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: all 0.4s ease;
            position: relative;
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        
        .project-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }
        
        .project-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-blue), var(--primary-dark));
            border-radius: 16px 16px 0 0;
        }
        
        .project-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        
        .project-card:hover img {
            transform: scale(1.05);
        }
        
        .project-card-content {
            padding: 25px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        
        .project-card h3 {
            margin: 0 0 15px 0;
            font-size: 1.3rem;
            color: var(--primary-dark);
            font-weight: 700;
            line-height: 1.4;
        }
        
        .project-card p {
            margin: 0 0 20px 0;
            color: var(--text-gray);
            line-height: 1.6;
            flex-grow: 1;
        }
        
        .project-btn {
            display: inline-block;
            width: 100%;
            padding: 14px 0;
            background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
            color: white;
            text-decoration: none;
            font-weight: 600;
            text-align: center;
            transition: all 0.3s ease;
            border-radius: 8px;
            position: relative;
            overflow: hidden;
        }
        
        .project-btn:hover {
            background: linear-gradient(135deg, var(--primary-dark), #0a3d62);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(45, 126, 233, 0.3);
        }
        
        .project-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s;
        }
        
        .project-btn:hover::before {
            left: 100%;
        }
        
        /* 数据统计 */
        .statistics {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
            padding: 80px 20px;
        }
        
        .stats-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
        }
        
        .stat-card {
            text-align: center;
            color: white;
        }
        
        .stat-card .number {
            font-size: 3.5rem;
            font-weight: 700;
            color: var(--gold);
            margin-bottom: 10px;
        }
        
        .stat-card .label {
            font-size: 1.1rem;
            opacity: 0.9;
        }
        
        /* 页脚 */
        footer {
            background: linear-gradient(135deg, var(--primary-dark) 0%, #051524 100%);
            color: var(--white);
            padding: 50px 20px 30px;
        }
        
        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 30px;
        }
        
        .footer-section h4 {
            font-size: 1.1rem;
            margin-bottom: 20px;
            color: var(--gold);
        }
        
        .footer-section p,
        .footer-section a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            line-height: 1.8;
            font-size: 0.95rem;
        }
        
        .footer-section a:hover {
            color: var(--white);
        }
        
        .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }
        
        .contact-item svg {
            width: 18px;
            height: 18px;
            fill: var(--gold);
            flex-shrink: 0;
        }
        
        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
        }
        
        /* 响应式 */
        @media (max-width: 968px) {
            .intro-content {
                grid-template-columns: 1fr;
            }
            
            .intro-stats {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .project-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: var(--primary-dark);
                flex-direction: column;
                padding: 20px;
                gap: 10px;
            }
            
            .nav-menu.active {
                display: flex;
            }
            
            .mobile-contact {
                display: block;
                margin-top: 15px;
                padding-top: 15px;
                border-top: 1px solid rgba(255, 255, 255, 0.2);
            }
            
            .contact-item {
                color: rgba(255, 255, 255, 0.8);
                font-size: 0.85rem;
                margin-bottom: 8px;
            }
            
            .mobile-buttons {
                display: flex;
                gap: 10px;
                margin-top: 15px;
            }
            
            .mobile-btn {
                flex: 1;
                padding: 12px 0;
                text-align: center;
                border-radius: 8px;
                font-weight: 600;
                text-decoration: none;
                transition: all 0.3s ease;
            }
            
            .consult-btn {
                background: var(--primary-blue);
                color: white;
            }
            
            .consult-btn:hover {
                background: var(--primary-dark);
            }
            
            .quote-btn {
                background: var(--gold);
                color: var(--primary-dark);
            }
            
            .quote-btn:hover {
                background: #d4a933;
            }
            
            .mobile-menu-btn {
                display: block;
                font-size: 24px;
            }
            
            .page-header h1 {
                font-size: 1.75rem;
            }
            
            .section-title h2 {
                font-size: 1.75rem;
            }
            
            .stat-card .number {
                font-size: 2.5rem;
            }
            
            .project-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            
            .project-tabs {
                gap: 10px;
            }
            
            .tab {
                padding: 10px 16px;
                font-size: 0.9rem;
            }
            
            .project-card-content {
                padding: 20px;
            }
            
            .project-card h3 {
                font-size: 1.1rem;
            }
            
            .project-card p {
                font-size: 0.9rem;
            }
        }