:root {
            --primary-color: #8B4513;
            --secondary-color: #D4AF37;
            --accent-color: #2C5530;
            --light-color: #F5F5DC;
            --dark-color: #333333;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            margin: 0 10px;
            transition: var(--transition);
            position: relative;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .nav-link.active {
            color: var(--secondary-color) !important;
            font-weight: 600;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            left: 0;
            bottom: 0;
            transition: var(--transition);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1542744095-fcf48d80b0fd?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1776&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
            padding: 180px 0 120px;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }
        .hero-subtitle {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .section-title {
            position: relative;
            padding-bottom: 20px;
            margin-bottom: 60px;
            font-weight: 700;
            color: var(--primary-color);
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 3px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .section-padding {
            padding: 100px 0;
        }
        .about-img {
            border-radius: 10px;
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
            transition: var(--transition);
        }
        .about-img:hover {
            transform: translateY(-10px);
            box-shadow: 0 25px 50px rgba(0,0,0,0.2);
        }
        .service-card {
            background: white;
            border-radius: 15px;
            padding: 40px 30px;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: var(--transition);
            border-top: 5px solid var(--light-color);
            text-align: center;
        }
        .service-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
            border-top-color: var(--secondary-color);
        }
        .service-icon {
            font-size: 3.5rem;
            color: var(--secondary-color);
            margin-bottom: 25px;
        }
        .project-card {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            transition: var(--transition);
            margin-bottom: 30px;
            height: 100%;
        }
        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.2);
        }
        .project-img {
            height: 250px;
            object-fit: cover;
            transition: var(--transition);
        }
        .project-card:hover .project-img {
            transform: scale(1.05);
        }
        .news-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: var(--transition);
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--primary-color);
            color: white;
            padding: 8px 15px;
            border-radius: 5px;
            font-weight: 600;
        }
        .contact-info-box {
            background: var(--light-color);
            padding: 30px;
            border-radius: 15px;
            height: 100%;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 10px;
            border-radius: 50px;
            color: var(--dark-color);
            font-weight: 500;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: var(--transition);
            text-decoration: none;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-5px);
            text-decoration: none;
        }
        .footer {
            background: var(--dark-color);
            color: white;
            padding: 80px 0 30px;
        }
        .footer a {
            color: #ddd;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 30px;
            margin-top: 50px;
            text-align: center;
            font-size: 0.9rem;
            opacity: 0.8;
        }
        .btn-primary-custom {
            background: var(--primary-color);
            border: none;
            padding: 12px 35px;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background: var(--accent-color);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.15);
        }
        .btn-secondary-custom {
            background: var(--secondary-color);
            border: none;
            padding: 12px 35px;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
            color: var(--dark-color);
        }
        .btn-secondary-custom:hover {
            background: #e6b800;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.15);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-padding {
                padding: 60px 0;
            }
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background: var(--secondary-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -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;
            position: relative;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 25px;
            height: 25px;
            background: var(--primary-color);
            border: 4px solid var(--secondary-color);
            border-radius: 50%;
            top: 15px;
            z-index: 1;
        }
        .timeline-item:nth-child(odd)::after {
            right: -13px;
        }
        .timeline-item:nth-child(even)::after {
            left: -13px;
        }
        @media (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-item::after {
                left: 18px;
            }
        }
        .form-control-custom {
            border-radius: 10px;
            padding: 15px;
            border: 1px solid #ddd;
            transition: var(--transition);
        }
        .form-control-custom:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(139, 69, 19, 0.25);
        }