:root {
            --primary-color: #1a365d;
            --secondary-color: #e63946;
            --accent-color: #2a9d8f;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
            --gradient-primary: linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
            --gradient-accent: linear-gradient(135deg, #2a9d8f 0%, #1d7873 100%);
            --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
            --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            overflow-x: hidden;
            line-height: 1.7;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .navbar {
            background: rgba(26, 54, 93, 0.95);
            backdrop-filter: blur(10px);
            padding: 1rem 0;
            transition: var(--transition);
            box-shadow: var(--shadow-md);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: white !important;
        }
        .navbar-nav .nav-link {
            color: rgba(255, 255, 255, 0.85) !important;
            font-weight: 500;
            padding: 0.5rem 1rem;
            margin: 0 0.2rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: white !important;
            background: rgba(255, 255, 255, 0.1);
        }
        .hero {
            background: var(--gradient-primary), url('https://images.unsplash.com/photo-1550745165-9bc0b252726f?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 10rem 0 8rem;
            position: relative;
            overflow: hidden;
        }
        .hero h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }
        .hero .lead {
            font-size: 1.3rem;
            opacity: 0.9;
            margin-bottom: 2.5rem;
        }
        .btn-primary {
            background: var(--secondary-color);
            border: none;
            padding: 0.8rem 2.5rem;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background: #c1121f;
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        .card-icon {
            width: 70px;
            height: 70px;
            background: var(--gradient-accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: -35px auto 1.5rem;
            color: white;
            font-size: 1.8rem;
            box-shadow: var(--shadow-md);
        }
        .service-card {
            border-top: 5px solid var(--accent-color);
        }
        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 12px;
            margin-bottom: 1.5rem;
            height: 300px;
        }
        .portfolio-img {
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(26, 54, 93, 0.85);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: var(--transition);
            padding: 2rem;
            color: white;
            text-align: center;
        }
        .portfolio-item:hover .portfolio-overlay {
            opacity: 1;
        }
        .portfolio-item:hover .portfolio-img {
            transform: scale(1.05);
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--accent-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
            border-radius: 3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px 30px;
            background: white;
            border-radius: 12px;
            box-shadow: var(--shadow-md);
            position: relative;
        }
        .timeline-item:nth-child(odd) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background-color: white;
            top: 22px;
            border-radius: 50%;
            z-index: 1;
            box-shadow: 0 0 0 4px var(--accent-color);
        }
        .timeline-item:nth-child(even) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            left: -10px;
            background-color: white;
            top: 22px;
            border-radius: 50%;
            z-index: 1;
            box-shadow: 0 0 0 4px var(--accent-color);
        }
        .contact-info {
            background: var(--light-color);
            border-radius: 12px;
            padding: 2.5rem;
            height: 100%;
            box-shadow: var(--shadow-sm);
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background: var(--gradient-primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }
        footer {
            background: var(--primary-color);
            color: rgba(255, 255, 255, 0.85);
            padding-top: 4rem;
        }
        footer a {
            color: rgba(255, 255, 255, 0.85);
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .flink {
            display: inline-block;
            background: rgba(255, 255, 255, 0.1);
            padding: 0.5rem 1.2rem;
            border-radius: 50px;
            margin: 0.3rem;
            transition: var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .flink:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-3px);
            text-decoration: none !important;
        }
        .copyright {
            background: rgba(0, 0, 0, 0.2);
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero {
                padding: 7rem 0 5rem;
            }
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-item:nth-child(odd) .timeline-content::after,
            .timeline-item:nth-child(even) .timeline-content::after {
                left: 21px;
                right: auto;
            }
        }
        .stats-counter {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stats-label {
            font-size: 1rem;
            color: var(--gray-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 1.5rem;
            border: 5px solid white;
            box-shadow: var(--shadow-md);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-md);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: #c1121f;
            transform: translateY(-5px);
        }
        .form-control, .form-select {
            padding: 0.8rem 1rem;
            border-radius: 8px;
            border: 1px solid #ced4da;
            transition: var(--transition);
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--accent-color);
            box-shadow: 0 0 0 0.25rem rgba(42, 157, 143, 0.25);
        }