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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    font-size: 17px;
}

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

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 15px;
}

.btn-primary {
    background: linear-gradient(135deg, #0066cc 0%, #004499 100%);
    color: #fff;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0055aa 0%, #003377 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: #0066cc;
    border: 2px solid #0066cc;
    margin-left: 15px;
}

.btn-secondary:hover {
    background-color: #0066cc;
    color: #fff;
    transform: translateY(-2px);
}

.btn-link {
    background-color: transparent;
    color: #0066cc;
    padding: 0;
    font-size: 14px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.btn-link:hover {
    color: #004499;
}

.btn-link i {
    margin-left: 5px;
    transition: transform 0.3s ease;
}

.btn-link:hover i {
    transform: translateX(3px);
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header-top {
    background-color: #f5f5f5;
    padding: 8px 0;
    border-bottom: 1px solid #e0e0e0;
}

.header-contact {
    display: flex;
    justify-content: flex-end;
    gap: 30px;
}

.header-contact span {
    font-size: 13px;
    color: #666;
    display: flex;
    align-items: center;
}

.header-contact i {
    margin-right: 6px;
    color: #0066cc;
}

.navbar {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: #0066cc;
}

.logo i {
    margin-right: 10px;
    font-size: 28px;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    margin-left: 35px;
    position: relative;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    display: inline-flex;
    align-items: center;
    font-size: 15px;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #0066cc;
}

.dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
}

.dropdown-toggle i {
    margin-left: 5px;
    font-size: 12px;
    transition: transform 0.3s ease;
}

.dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background-color: #fff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    list-style: none;
    margin: 0;
    padding: 30px;
    min-width: 900px;
    max-width: 1200px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1001;
    border-radius: 8px;
    display: flex;
    gap: 40px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-column {
    margin: 0;
    flex: 1;
    min-width: 0;
}

.dropdown-column-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e6e6e6;
}

.dropdown-column-header h4 {
    font-size: 18px;
    font-weight: 600;
    color: #0066cc;
    margin: 0 0 10px 0;
}

.dropdown-column-header p {
    font-size: 13px;
    color: #666;
    margin: 0;
    line-height: 1.6;
}

.dropdown-column-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.dropdown-column-list li {
    margin: 0;
    width: 100%;
}

.dropdown-column-list a {
    display: block;
    padding: 10px 0;
    color: #333;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 400;
    font-size: 14px;
    white-space: nowrap;
}

.dropdown-column-list a:hover {
    color: #0066cc;
    padding-left: 10px;
}

.nav-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: #333;
}

.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

.hero-section {
    padding: 0;
    background-color: #fff;
    height: 80vh;
    min-height: 600px;
}

.hero-container {
    display: flex;
    flex-direction: column;
    max-width: 100%;
    margin: 0 auto;
    padding: 0;
    height: 100%;
}

.hero-left {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-left .hero-image {
    width: 100%;
    height: 100%;
    max-height: none;
    object-fit: cover;
}

.page-header {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-align: center;
}

.page-header h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

.business-section {
    padding: 80px 0;
    background-color: #fff;
    background-image: url('img/背景.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.business-container {
    display: flex;
    gap: 40px;
    align-items: stretch;
}

.business-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.business-title {
    font-size: 32px;
    font-weight: 700;
    color: #333;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
}

.business-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #0066cc 0%, #004499 100%);
}

.business-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.business-info .btn-link {
    margin-top: 20px;
    display: inline-flex;
    align-items: center;
}

.business-item {
    padding: 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.business-item:hover {
    background-color: #f5f9ff;
    border-color: #0066cc;
    transform: translateX(10px);
}

.business-item.active {
    background-color: #e6f2ff;
    border-color: #0066cc;
}

.business-name {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.business-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
}

.business-image {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f9f9f9;
    border-radius: 8px;
    padding: 20px;
}

.business-img {
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: contain;
}

.solutions-section {
    padding: 80px 0;
    background-color: #f9f9f9;
}

.solutions-container {
    display: flex;
    gap: 60px;
    align-items: center;
    justify-content: center;
}

.solutions-intro {
    flex: 1;
    min-width: 300px;
}

.solutions-intro h3 {
    font-size: 28px;
    font-weight: 700;
    color: #333;
    margin-bottom: 20px;
}

.solutions-intro p {
    font-size: 15px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 30px;
}

.solutions-categories {
    flex: 2;
    display: flex;
    gap: 40px;
    justify-content: space-between;
}

.solution-category {
    flex: 1;
}

.solution-category h4 {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #0066cc;
}

.solution-category ul {
    list-style: none;
    padding: 0;
}

.solution-category li {
    margin-bottom: 12px;
}

.solution-category a {
    color: #666;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    display: block;
    padding: 8px 0;
}

.solution-category a:hover {
    color: #0066cc;
    padding-left: 10px;
}

.products-section {
    padding: 80px 0;
    background-color: #fff;
}

.products-container {
    display: flex;
    gap: 60px;
    align-items: center;
    justify-content: center;
}

.products-intro {
    flex: 1;
    min-width: 300px;
}

.products-intro h3 {
    font-size: 28px;
    font-weight: 700;
    color: #333;
    margin-bottom: 20px;
}

.products-intro p {
    font-size: 15px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 30px;
}

.products-categories {
    flex: 2;
    display: flex;
    gap: 40px;
    justify-content: space-between;
}

.product-category {
    flex: 1;
}

.product-category h4 {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #0066cc;
}

.product-category ul {
    list-style: none;
    padding: 0;
}

.product-category li {
    margin-bottom: 12px;
}

.product-category a {
    color: #666;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    display: block;
    padding: 8px 0;
}

.product-category a:hover {
    color: #0066cc;
    padding-left: 10px;
}

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

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: #333;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #0066cc 0%, #004499 100%);
}

.section-header p {
    font-size: 16px;
    color: #666;
    max-width: 700px;
    margin: 25px auto 0;
}

.cases-section {
    padding: 80px 0;
    background-color: #fff;
}

.cases-section .section-header {
    text-align: left;
}

.cases-section .section-header h2::after {
    left: 0;
    transform: none;
}

.cases-section .section-header p {
    margin: 25px 0 0;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.case-card {
    background-color: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.case-card:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    transform: translateY(-5px);
}

.case-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.case-content {
    padding: 30px;
    text-align: left;
}

.case-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.case-content p {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
}

.case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    display: inline-block;
    padding: 6px 14px;
    background-color: #e6f2ff;
    color: #0066cc;
    font-size: 12px;
    border-radius: 20px;
    font-weight: 500;
}

.about-section {
    padding: 80px 0;
    background-color: #f9f9f9;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 28px;
    font-weight: 600;
    color: #333;
    margin-bottom: 20px;
    margin-top: 40px;
}

.about-text h3:first-child {
    margin-top: 0;
}

.about-text p {
    font-size: 16px;
    color: #555;
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.stat-item {
    text-align: center;
    padding: 30px 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.stat-number {
    font-size: 42px;
    font-weight: 700;
    color: #0066cc;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 15px;
    color: #666;
    font-weight: 500;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.value-item {
    display: flex;
    align-items: flex-start;
    padding: 25px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.value-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.value-icon {
    width: 55px;
    height: 55px;
    background: linear-gradient(135deg, #0066cc 0%, #004499 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 24px;
    margin-right: 20px;
    flex-shrink: 0;
}

.value-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.value-content p {
    font-size: 14px;
    color: #666;
    margin: 0;
    line-height: 1.6;
}

.contact-section {
    padding: 80px 0;
    background-color: #fff;
}

.contact-content {
    display: flex;
    gap: 50px;
    flex-wrap: wrap;
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #0066cc 0%, #004499 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    flex-shrink: 0;
}

.contact-icon i {
    color: #fff;
    font-size: 20px;
}

.contact-details h4 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.contact-details p {
    font-size: 14px;
    color: #666;
}

.contact-form-wrapper {
    flex: 1;
    min-width: 350px;
    background-color: #f9f9f9;
    padding: 40px;
    border-radius: 8px;
}

.contact-form {
    display: flex;
    flex-direction: column;
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #333;
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0066cc;
}

.form-group textarea {
    resize: vertical;
}

.contact-form .btn {
    width: 100%;
}

.footer {
    background-color: #1a1a1a;
    color: #fff;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #fff;
}

.footer-logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: #0066cc;
    margin-bottom: 20px;
}

.footer-logo i {
    margin-right: 10px;
    font-size: 28px;
}

.footer-section p {
    font-size: 14px;
    color: #aaa;
    line-height: 1.7;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul a {
    color: #aaa;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-section ul a:hover {
    color: #0066cc;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background-color: #333;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background-color: #0066cc;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #333;
}

.footer-bottom p {
    font-size: 13px;
    color: #888;
}

@media (max-width: 992px) {
    .products-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-top {
        display: none;
    }

    .hero-container {
        flex-direction: column;
        gap: 40px;
    }

    .business-container {
        flex-direction: column;
    }

    .business-image {
        min-height: 300px;
    }

    .business-title {
        font-size: 24px;
    }

    .business-name {
        font-size: 18px;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .case-image {
        height: 200px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: #fff;
        flex-direction: column;
        padding: 20px;
        transition: left 0.3s ease;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 0;
        width: 100%;
    }
    
    .nav-menu a {
        padding: 15px 0;
        border-bottom: 1px solid #f0f0f0;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 20px;
        display: none;
        background-color: #f9f9f9;
        border-radius: 0;
        min-width: auto;
        flex-direction: column;
        gap: 20px;
    }
    
    .dropdown.active .dropdown-menu {
        display: flex;
    }
    
    .dropdown-column {
        border-bottom: 1px solid #e0e0e0;
        padding-bottom: 15px;
    }
    
    .dropdown-column:last-child {
        border-bottom: none;
        padding-bottom: 0;
    }
    
    .dropdown-column-header {
        border-bottom: none;
        margin-bottom: 10px;
        padding-bottom: 0;
    }
    
    .dropdown-column-header h4 {
        font-size: 16px;
    }
    
    .dropdown-column-header p {
        font-size: 12px;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-toggle.active i {
        transform: rotate(90deg);
    }
    
    .contact-content {
        flex-direction: column;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .product-card {
        padding: 30px 20px;
    }
    
    .contact-form-wrapper {
        padding: 30px 20px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}