:root {
            --primary-color: #2c7be5;
            --secondary-color: #6c757d;
            --neutral-color: #f8f9fa;
            --text-color: #212529;
            --light-text: #6c757d;
            --border-radius: 10px;
            --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            background-color: #fff;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header Styles */
        header {
            background-color: #fff;
            box-shadow: var(--box-shadow);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
        }

        .logo {
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
            text-decoration: none;
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links li {
            margin-left: 30px;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }

        .nav-links a:hover {
            color: var(--primary-color);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -5px;
            left: 0;
            background-color: var(--primary-color);
            transition: var(--transition);
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        /* Hero Section */
        .hero {
            height: 100vh;
            background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('../img/hero-bg.jpg');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            text-align: center;
            color: #fff;
            padding-top: 80px;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
            animation: fadeInUp 1s ease;
        }

        .hero p {
            font-size: 20px;
            margin-bottom: 30px;
            animation: fadeInUp 1s ease 0.2s;
            animation-fill-mode: both;
        }

        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--primary-color);
            color: #fff;
            text-decoration: none;
            border-radius: var(--border-radius);
            font-weight: 600;
            transition: var(--transition);
            animation: fadeInUp 1s ease 0.4s;
            animation-fill-mode: both;
        }

        .btn:hover {
            background-color: #1a5cb0;
            transform: translateY(-3px);
        }

        /* Section Styles */
        section {
            padding: 80px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-title h2 {
            font-size: 36px;
            color: var(--text-color);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }

        .section-title p {
            color: var(--light-text);
            max-width: 700px;
            margin: 20px auto 0;
        }

        /* About Section */
        .about {
            background-color: var(--neutral-color);
        }

        .about-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }

        .about-text {
            flex: 1;
        }

        .about-text h3 {
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--primary-color);
        }

        .about-text p {
            margin-bottom: 20px;
            color: var(--light-text);
        }

        .about-image {
            flex: 1;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }

        .about-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: var(--transition);
        }

        .about-image:hover img {
            transform: scale(1.05);
        }

        /* Services Section */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: #fff;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

        .service-image {
            height: 200px;
            overflow: hidden;
        }

        .service-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .service-card:hover .service-image img {
            transform: scale(1.1);
        }

        .service-content {
            padding: 25px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .service-content h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: var(--primary-color);
        }

        .service-content p {
            color: var(--light-text);
            margin-bottom: 20px;
            flex-grow: 1;
        }

        .service-link {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            transition: var(--transition);
        }

        .service-link:hover {
            color: #1a5cb0;
        }

        .service-link i {
            margin-left: 5px;
            transition: var(--transition);
        }

        .service-link:hover i {
            transform: translateX(5px);
        }

        /* Contact Section */
        .contact {
            background-color: var(--neutral-color);
        }

        .contact-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .contact-info h3 {
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--primary-color);
        }

        .contact-info p {
            margin-bottom: 20px;
            color: var(--light-text);
        }

        .contact-item {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }

        .contact-item i {
            font-size: 20px;
            color: var(--primary-color);
            margin-right: 15px;
            width: 30px;
            text-align: center;
        }

        .contact-form {
            background-color: #fff;
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
        }

        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-family: inherit;
            transition: var(--transition);
        }

        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary-color);
        }

        .form-group textarea {
            resize: vertical;
            min-height: 120px;
        }

        .btn-submit {
            background-color: var(--primary-color);
            color: #fff;
            border: none;
            padding: 12px 30px;
            border-radius: var(--border-radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-submit:hover {
            background-color: #1a5cb0;
        }

        /* Footer */
        footer {
            background-color: #212529;
            color: #fff;
            padding: 40px 0;
            text-align: center;
        }

        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .footer-logo {
            font-size: 24px;
            font-weight: bold;
            color: #fff;
            text-decoration: none;
            margin-bottom: 20px;
        }

        .social-links {
            display: flex;
            gap: 15px;
        }

        .social-links a {
            color: #fff;
            font-size: 20px;
            transition: var(--transition);
        }

        .social-links a:hover {
            color: var(--primary-color);
        }

        .copyright {
            margin-top: 20px;
            color: #aaa;
            font-size: 14px;
            width: 100%;
            text-align: center;
            border-top: 1px solid #333;
            padding-top: 20px;
        }
        
        .copyright a {
            color: #aaa;
            text-decoration: none;
            transition: var(--transition);
        }
        
        .copyright a:hover {
            color: var(--primary-color);
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Responsive Styles */
        @media (max-width: 992px) {
            .about-content,
            .contact-content {
                flex-direction: column;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            
            .hero h1 {
                font-size: 36px;
            }
            
            .hero p {
                font-size: 18px;
            }
            
            section {
                padding: 60px 0;
            }
            
            .section-title h2 {
                font-size: 30px;
            }
        }

/* Popup Styles - 完全遮挡背景内容 */
#overlay {
    position: fixed;
    top: 0; 
    left: 0;
    width: 100%; 
    height: 100%;
    background: #ffffff; /* 完全不透明的白色背景 */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 999999; /* 确保在最顶层 */
}

/* 当弹出层显示时，隐藏body滚动 */
body.modal-open {
    overflow: hidden;
}
.popup {
    background: #fff;
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 40px rgb(244 238 238);
    border: 2px solid #e0e0e0;
    animation: fadeIn 0.6s ease;
}
  .popup h2 {
      margin-bottom: 15px;
      color: #2c7be5;
  }
  .popup button,
  .popup .popup-btn {
      padding: 10px 20px;
      background: #2c7be5;
      color: #fff;
      border: none;
      border-radius: 6px;
      font-size: 16px;
      cursor: pointer;
      transition: background 0.3s;
      text-decoration: none;
      display: inline-block;
  }
  .popup button:hover,
  .popup .popup-btn:hover {
      background: #1a5cb0;
  }
  @keyframes fadeIn {
      from { opacity: 0; transform: scale(0.9); }
      to { opacity: 1; transform: scale(1); }
  }