* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }

    :root {
        --primary: #2563eb;
        --primary-dark: #1d4ed8;
        --secondary: #64748b;
        --light: #f8fafc;
        --dark: #1e293b;
        --accent: #f97316;
        --border: #e2e8f0;
        --success: #10b981;
        --card-shadow: 0 10px 25px rgba(0, 0, 0, 0.07);
    }

    body {
        background-color: #f1f5f9;
        color: var(--dark);
        line-height: 1.6;
        position: relative;
    }

    /* Header & Navigation */
    header {
        background-color: white;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        position: sticky;
        top: 0;
        z-index: 100;
    }

    .container {
        max-width: 1920px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .nav-container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 1.2rem 0;
    }

    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 1.8rem;
        font-weight: 700;
        color: var(--primary);
        text-decoration: none;
    }

    .logo i {
        color: var(--accent);
    }

    /* Desktop Navigation */
    .desktop-nav {
        display: flex;
        align-items: center;
        gap: 2rem;
    }

    .nav-links {
        display: flex;
        gap: 1.8rem;
        list-style: none;
    }

    .nav-links a {
        color: var(--dark);
        text-decoration: none;
        font-weight: 500;
        font-size: 1.05rem;
        transition: all 0.3s ease;
        position: relative;
        padding: 0.5rem 0;
    }

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

    .nav-links a::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 0;
        height: 2px;
        background: var(--primary);
        transition: width 0.3s ease;
    }

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

    /* Language Switcher */
    .language-switcher {
        position: relative;
        cursor: pointer;
    }

    .current-language {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 0.5rem 0.8rem;
        border-radius: 6px;
        transition: background 0.2s;
    }

    .current-language:hover {
        background: #f1f5f9;
    }

    .language-flag {
        width: 35px;
        height: 18px;
        border-radius: 2px;
        overflow: hidden;
        display: flex;
        align-items: center;
        justify-content: center;
        background: #ef4444;
        color: white;
        font-size: 0.7rem;
        font-weight: bold;
    }

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 230px;
    max-height: 450px; /* 设置一个最大高度，根据需求调整 */
    padding: 0.8rem 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 10;
    overflow-y: auto; /* 添加垂直滚动条 */
}

    .language-switcher:hover .language-dropdown {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .language-option {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 0.7rem 1.2rem;
        transition: background 0.2s;
        cursor: pointer;
    }

    .language-option:hover {
        background: #f8fafc;
    }

    /* Auth Buttons */
    .auth-buttons {
        display: flex;
        gap: 1rem;
    }

    .btn {
        padding: 0.7rem 1.4rem;
        border-radius: 6px;
        font-weight: 500;
        cursor: pointer;
        transition: all 0.3s ease;
        border: none;
        font-size: 1rem;
    }

    .btn-login {
        background: transparent;
        color: var(--primary);
        border: 1px solid var(--primary);
    }

    .btn-login:hover {
        background: #e0f2fe;
    }

    .btn-register {
        background: var(--primary);
        color: white;
        border: 1px solid var(--primary);
    }

    .btn-register:hover {
        background: var(--primary-dark);
    }

    .btn-lang {
        border: 1px solid #DDD;
    }

    .btn-lang:hover {
         background-color:#F5F5F5;
    }

    /* Mobile Navigation */
    .mobile-toggle {
        display: none;
        background: transparent;
        border: none;
        font-size: 1.5rem;
        color: var(--dark);
        cursor: pointer;
        padding: 0.5rem;
    }

    .mobile-nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(255, 255, 255, 0.98);
        z-index: 1000;
        display: flex;
        flex-direction: column;
        padding: 2rem;
        transform: translateX(100%);
        transition: transform 0.4s ease;
    }

    .mobile-nav.active {
        transform: translateX(0);
    }

    .mobile-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding-bottom: 2rem;
        border-bottom: 1px solid var(--border);
        margin-bottom: 2rem;
    }

    .mobile-links {
        list-style: none;
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
    }

    .mobile-links a {
        text-decoration: none;
        color: var(--dark);
        font-size: 1.2rem;
        font-weight: 500;
        display: block;
        padding: 0.8rem 0;
        border-bottom: 1px solid var(--border);
    }

.mobile-language {
    margin-top: auto;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    max-height: 200px; /* 设置最大高度（根据需求调整） */
    overflow-y: auto; /* 内容超出时显示垂直滚动条 */
}

    .mobile-auth {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        margin-top: 2rem;
    }

    .mobile-auth .btn {
        width: 100%;
        text-align: center;
    }

/* Breadcrumb */
.breadcrumb {
            padding: 1.5rem 0;
            background: white;
            border-bottom: 1px solid var(--border);
        }

        .breadcrumb ul {
            display: flex;
            list-style: none;
            gap: 1rem;
        }

        .breadcrumb li {
            display: flex;
            align-items: center;
            font-size: 0.95rem;
        }

        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin-left: 1rem;
            color: var(--secondary);
            opacity: 0.7;
        }

        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }

        .breadcrumb span {
            color: var(--dark);
        }



    /* Hero Section */
    .hero {
        background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
        color: white;
        padding: 6rem 0;
        text-align: center;
        position: relative;
        overflow: hidden;
    }

    .hero::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: url('http://pic.jisufabu.com/imgweb/tupian/20258/15/2025815223221.jpg') no-repeat center center;
        background-size: cover;
        opacity: 0.15;
    }

    .hero-content {
        max-width: 800px;
        margin: 0 auto;
        padding: 0 20px;
        position: relative;
        z-index: 1;
    }

    .hero h1 {
        font-size: 3.2rem;
        margin-bottom: 1.5rem;
        line-height: 1.2;
    }

    .hero p {
        font-size: 1.3rem;
        margin-bottom: 2.5rem;
        opacity: 0.9;
    }

    .hero-buttons {
        display: flex;
        justify-content: center;
        gap: 1.2rem;
        margin-top: 2rem;
    }

    .btn-outline {
        background: transparent;
        border: 2px solid white;
        color: white;
    }

    .btn-outline:hover {
        background: rgba(255, 255, 255, 0.1);
    }

    /* Features Section */
    .features {
        padding: 5rem 0;
    }

    .section-title {
        text-align: center;
        margin-bottom: 3.5rem;
    }

    .section-title h2 {
        font-size: 2.5rem;
        color: var(--dark);
        margin-bottom: 1rem;
        position: relative;
        display: inline-block;
    }

    .section-title h2:after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background: var(--accent);
        border-radius: 2px;
    }

    .section-title p {
        color: var(--secondary);
        font-size: 1.2rem;
        max-width: 1920px;
        margin: 1.5rem auto 0;
    }

    .features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 2.5rem;
        max-width: 1920px;
        margin: 0 auto;
    }

    .feature-card {
        background: white;
        border-radius: 12px;
        padding: 2.5rem 2rem;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        transition: transform 0.3s ease;
    }

    .feature-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    }

    .feature-icon {
        width: 70px;
        height: 70px;
        background: #dbeafe;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 1.5rem;
        color: var(--primary);
        font-size: 1.8rem;
        overflow: hidden;
    }

    .feature-card h3 {
        font-size: 1.5rem;
        margin-bottom: 1rem;
        color: var(--dark);
    }
h3 a{text-decoration:none;}

    .feature-card p {
        color: var(--secondary);
        line-height: 1.7;
    }

    /* Contact Section */
    .contact-section {
        padding: 6rem 0;
    }

    .contact-container {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 3rem;
        max-width: 1200px;
        margin: 0 auto;
    }

    .contact-info {
        background: white;
        border-radius: 16px;
        padding: 3rem;
        box-shadow: var(--card-shadow);
    }

    .contact-methods {
        display: flex;
        flex-direction: column;
        gap: 2rem;
        margin-top: 2rem;
    }

    .contact-item {
        display: flex;
        gap: 1.5rem;
        align-items: flex-start;
    }

    .contact-icon {
        width: 56px;
        height: 56px;
        background: #dbeafe;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--primary);
        font-size: 1.5rem;
    }

    .contact-details h3 {
        font-size: 1.3rem;
        margin-bottom: 0.5rem;
    }

    .contact-details p {
        color: var(--secondary);
        line-height: 1.8;
    }

    .social-links {
        margin-top: 3rem;
    }

    .social-links h3 {
        font-size: 1.4rem;
        margin-bottom: 1.5rem;
    }

    .social-icons {
        display: flex;
        gap: 1.2rem;
    }

    .social-icon {
        width: 50px;
        height: 50px;
        border-radius: 50%;
        background: var(--light);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.4rem;
        color: var(--dark);
        transition: all 0.3s ease;
    }

    .social-icon:hover {
        transform: translateY(-5px);
        background: var(--primary);
        color: white;
    }

    .contact-form {
        background: white;
        border-radius: 16px;
        padding: 3rem;
        box-shadow: var(--card-shadow);
    }

    .form-group {
        margin-bottom: 1.8rem;
    }

    .form-group label {
        display: block;
        margin-bottom: 0.5rem;
        font-weight: 500;
        color: var(--dark);
    }

    .form-control {
        width: 100%;
        padding: 1rem;
        border: 1px solid var(--border);
        border-radius: 8px;
        font-size: 1rem;
        transition: all 0.3s ease;
    }

    .form-control:focus {
        border-color: var(--primary);
        outline: none;
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    textarea.form-control {
        min-height: 150px;
        resize: vertical;
    }

    .btn-submit {
        background: var(--primary);
        color: white;
        padding: 1rem 2.5rem;
        font-size: 1.1rem;
        border-radius: 8px;
        cursor: pointer;
        transition: all 0.3s ease;
        border: none;
        font-weight: 600;
        width: 100%;
    }

    .btn-submit:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
    }

    /* Team Section */
    .team-section {
        padding: 6rem 0;
        background: #f8fafc;
    }

    .team-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 2.5rem;
        max-width: 1200px;
        margin: 0 auto;
    }

    .team-card {
        background: white;
        border-radius: 16px;
        overflow: hidden;
        box-shadow: var(--card-shadow);
        transition: all 0.4s ease;
    }

    .team-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    }

    .team-img {
        height: 280px;
        overflow: hidden;
    }

    .team-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.5s ease;
    }

    .team-card:hover .team-img img {
        transform: scale(1.05);
    }

    .team-info {
        padding: 2rem;
        text-align: center;
    }

    .team-info h3 {
        font-size: 1.4rem;
        margin-bottom: 0.5rem;
        color: var(--dark);
    }

    .team-info .position {
        color: var(--primary);
        font-weight: 600;
        margin-bottom: 1rem;
        display: block;
    }

    .team-info p {
        color: var(--secondary);
        font-style: italic;
        line-height: 1.7;
    }

    .team-social {
        display: flex;
        justify-content: center;
        gap: 1rem;
        margin-top: 1.5rem;
    }

    .team-social a {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: #e2e8f0;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--dark);
        transition: all 0.3s ease;
    }

    .team-social a:hover {
        background: var(--primary);
        color: white;
        transform: translateY(-3px);
    }

    /* Map Section */
    .map-section {
        padding: 0 0 6rem;
    }

    .map-container {
        height: 500px;
        border-radius: 16px;
        overflow: hidden;
        box-shadow: var(--card-shadow);
        max-width: 1200px;
        margin: 0 auto;
    }

    .map-container iframe {
        width: 100%;
        height: 100%;
        border: none;
    }

    /* Floating Action Buttons */
    .floating-buttons {
        position: fixed;
        bottom: 30px;
        right: 30px;
        display: flex;
        flex-direction: column;
        gap: 15px;
        z-index: 99;
    }

    .floating-btn {
        width: 60px;
        height: 60px;
        border-radius: 50%;
        background: var(--primary);
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        box-shadow: 0 6px 15px rgba(37, 99, 235, 0.3);
        cursor: pointer;
        transition: all 0.3s ease;
        position: relative;
        border: none;
    }

    .floating-btn:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(37, 99, 235, 0.4);
    }

    .floating-btn .tooltip {
        position: absolute;
        right: 70px;
        background: var(--dark);
        color: white;
        padding: 8px 15px;
        border-radius: 6px;
        font-size: 0.9rem;
        white-space: nowrap;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    .floating-btn:hover .tooltip {
        opacity: 1;
    }

    .floating-btn.help-btn {
        background: var(--accent);
        box-shadow: 0 6px 15px rgba(249, 115, 22, 0.3);
    }

    .floating-btn.help-btn:hover {
        box-shadow: 0 10px 20px rgba(249, 115, 22, 0.4);
    }

    .floating-btn.chat-btn {
        background: var(--success);
        box-shadow: 0 6px 15px rgba(16, 185, 129, 0.3);
    }

    .floating-btn.chat-btn:hover {
        box-shadow: 0 10px 20px rgba(16, 185, 129, 0.4);
    }

    /* Footer */
    footer {
        background: var(--dark);
        color: white;
        padding: 3rem 0;
        text-align: center;
    }

    .footer-content {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .footer-logo {
        font-size: 2rem;
        font-weight: 700;
        color: white;
        display: inline-flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 1.5rem;
    }

    .footer-links {
        display: flex;
        justify-content: center;
        gap: 2rem;
        margin-bottom: 2rem;
        flex-wrap: wrap;
    }

    .footer-links a {
        color: #cbd5e1;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    .footer-links a:hover {
        color: white;
    }

    .social-section {
        margin: 2rem 0;
    }

    .social-section h4 {
        font-size: 1.2rem;
        margin-bottom: 1rem;
        color: #94a3b8;
        font-weight: 500;
    }

    .footer-social-icons {
        display: flex;
        justify-content: center;
        gap: 1.5rem;
        margin-top: 1rem;
    }

    .footer-social-icon {
        width: 45px;
        height: 45px;
        border-radius: 50%;
        background: #334155;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.3rem;
        color: white;
        transition: all 0.3s ease;
        text-decoration:none;
    }

    .footer-social-icon:hover {
        background: var(--primary);
        transform: translateY(-5px);
        text-decoration:none;
    }

    .copyright {
        color: #94a3b8;
        font-size: 0.95rem;
        margin-top: 2rem;
        border-top: 1px solid #334155;
        padding-top: 2rem;
    }

    /* Help Modal */
    .modal {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.7);
        z-index: 1000;
        align-items: center;
        justify-content: center;
    }

    .modal-content {
        background: white;
        border-radius: 16px;
        width: 90%;
        max-width: 500px;
        padding: 2.5rem;
        position: relative;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    }

    .close-modal {
        position: absolute;
        top: 20px;
        right: 20px;
        font-size: 1.8rem;
        cursor: pointer;
        color: var(--secondary);
        transition: color 0.3s;
    }

    .close-modal:hover {
        color: var(--primary);
    }

    .modal h3 {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
        color: var(--dark);
    }

    .modal p {
        margin-bottom: 1.5rem;
        color: var(--secondary);
        line-height: 1.7;
    }

    .modal-buttons {
        display: flex;
        gap: 1rem;
        margin-top: 2rem;
    }

    .modal-buttons .btn {
        flex: 1;
        text-align: center;
        padding: 0.9rem;
    }

    /* Responsive Styles */
    @media (max-width: 962px) {
        .hero h1 {
            font-size: 2.8rem;
        }
        
        .nav-links {
            gap: 1.2rem;
        }
    }

    @media (max-width: 768px) {
        .desktop-nav {
            display: none;
        }
        
        .mobile-toggle {
            display: block;
        }
        
        .hero {
            padding: 4rem 0;
        }
        
        .hero h1 {
            font-size: 2.3rem;
        }
        
        .hero p {
            font-size: 1.1rem;
        }
        
        .contact-section, .team-section {
            padding: 4rem 0;
        }
        
        .section-title h2 {
            font-size: 2rem;
        }

        .floating-buttons {
            bottom: 20px;
            right: 20px;
        }

        .floating-btn {
            width: 50px;
            height: 50px;
            font-size: 1.3rem;
        }
    }

    @media (max-width: 526px) {
        .logo span {
            display: none;
        }
        
        .contact-info, .contact-form {
            padding: 2rem;
        }
        
        .contact-item {
            flex-direction: column;
            align-items: center;
            text-align: center;
        }
        
        .map-container {
            height: 350px;
        }

        .footer-links {
            flex-direction: column;
            gap: 1rem;
        }

        .hero-buttons {
            flex-direction: column;
            gap: 1rem;
        }
        
        .hero-buttons .btn {
            width: 100%;
        }
        
        .feature-card {
            padding: 2rem 1.5rem;
        }
    }