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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333333;
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: #ffffff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

.header.scrolled {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #333333;
}

.logo img {
    height: 50px;
    width: auto;
}

.logo-img {
    height: 50px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    text-decoration: none;
    color: #666666;
    font-size: 16px;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #1890FF;
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: #1890FF;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: #333333;
    margin: 3px 0;
    transition: all 0.3s ease;
}

main {
    margin-top: 70px;
    min-height: calc(100vh - 70px - 300px);
}

.footer {
    background-color: #F5F5F5;
    padding: 48px 0 24px;
    margin-top: 64px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    margin-bottom: 32px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 16px;
    color: #333333;
}

.footer-section p,
.footer-section li {
    font-size: 14px;
    color: #666666;
    margin-bottom: 8px;
}

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

.footer-section a {
    color: #666666;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #1890FF;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid #E8E8E8;
}

.footer-bottom p {
    font-size: 14px;
    color: #999999;
}

.section-title {
    font-size: 32px;
    text-align: center;
    margin-bottom: 48px;
    color: #333333;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    background-color: #1890FF;
    color: #ffffff;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #096dd9;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid #1890FF;
    color: #1890FF;
}

.btn-outline:hover {
    background-color: #1890FF;
    color: #ffffff;
}

.banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #ffffff;
    padding: 80px 24px;
}

.banner-content {
    max-width: 800px;
}

.banner-title {
    font-size: 48px;
    margin-bottom: 24px;
    font-weight: 700;
}

.banner-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.banner-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.banner .btn-outline {
    border-color: #ffffff;
    color: #ffffff;
}

.banner .btn-outline:hover {
    background-color: #ffffff;
    color: #667eea;
}

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

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    color: #666666;
    margin-bottom: 16px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 24px;
    background-color: #F5F5F5;
    border-radius: 8px;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: #1890FF;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: #666666;
}

.products-section {
    padding: 80px 0;
    background-color: #F5F5F5;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.product-card {
    background-color: #ffffff;
    padding: 32px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.product-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.product-title {
    font-size: 20px;
    margin-bottom: 12px;
    color: #333333;
}

.product-desc {
    font-size: 14px;
    color: #666666;
    margin-bottom: 16px;
    line-height: 1.6;
}

.product-link {
    color: #1890FF;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.product-link:hover {
    color: #096dd9;
}

.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 60px 0;
    color: #ffffff;
    text-align: center;
}

.page-title {
    font-size: 36px;
    margin-bottom: 16px;
}

.breadcrumb {
    font-size: 14px;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: #ffffff;
}

.breadcrumb .separator {
    margin: 0 8px;
    color: rgba(255, 255, 255, 0.6);
}

.breadcrumb .current {
    color: #ffffff;
}

.category-nav {
    background-color: #ffffff;
    padding: 24px 0;
    border-bottom: 1px solid #E8E8E8;
    position: sticky;
    top: 70px;
    z-index: 100;
}

.category-tabs {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.tab-btn {
    padding: 10px 24px;
    background-color: #F5F5F5;
    border: 2px solid transparent;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    color: #666666;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background-color: #e6f7ff;
    color: #1890FF;
}

.tab-btn.active {
    background-color: #1890FF;
    color: #ffffff;
    border-color: #1890FF;
}

.products-list {
    padding: 48px 0;
    min-height: 400px;
}

.products-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.product-item {
    background-color: #ffffff;
    border: 1px solid #E8E8E8;
    border-radius: 8px;
    padding: 24px;
    transition: all 0.3s ease;
}

.product-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.product-item-title {
    font-size: 18px;
    color: #333333;
    margin-bottom: 12px;
}

.product-item-desc {
    font-size: 14px;
    color: #666666;
    line-height: 1.6;
    margin-bottom: 12px;
}

.product-item-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: #e6f7ff;
    color: #1890FF;
    border-radius: 12px;
    font-size: 12px;
}

.brands-section {
    padding: 64px 0;
}

.brand-category {
    margin-bottom: 64px;
}

.brand-category:last-child {
    margin-bottom: 0;
}

.brand-category-title {
    font-size: 24px;
    color: #333333;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 2px solid #1890FF;
    display: inline-block;
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
}

.brand-item {
    background-color: #ffffff;
    border: 1px solid #E8E8E8;
    border-radius: 8px;
    padding: 32px 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.brand-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    transform: translateY(-3px);
    border-color: #1890FF;
}

.brand-logo {
    font-size: 18px;
    font-weight: 600;
    color: #333333;
    margin-bottom: 12px;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-name {
    font-size: 14px;
    color: #666666;
}

.brand-item::after {
    content: attr(data-brand);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #333333;
    color: #ffffff;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    margin-bottom: 8px;
}

.brand-item:hover::after {
    opacity: 1;
    visibility: visible;
}

.customers-section {
    padding: 64px 0;
    background-color: #F5F5F5;
}

.customers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.customer-card {
    background-color: #ffffff;
    padding: 32px;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
}

.customer-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.customer-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.customer-title {
    font-size: 20px;
    color: #333333;
    margin-bottom: 12px;
}

.customer-desc {
    font-size: 14px;
    color: #666666;
    line-height: 1.6;
}

.qualifications-section {
    padding: 64px 0;
}

.qualifications-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.qualification-item {
    background-color: #ffffff;
    border: 2px solid #E8E8E8;
    border-radius: 8px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
}

.qualification-item:hover {
    border-color: #1890FF;
    box-shadow: 0 4px 16px rgba(24, 144, 255, 0.15);
}

.qualification-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.qualification-title {
    font-size: 18px;
    color: #333333;
    margin-bottom: 8px;
}

.qualification-desc {
    font-size: 14px;
    color: #666666;
}

.contact-section {
    padding: 64px 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info {
    background-color: #F5F5F5;
    padding: 40px;
    border-radius: 8px;
}

.contact-info-title {
    font-size: 24px;
    color: #333333;
    margin-bottom: 32px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid #E8E8E8;
}

.info-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.info-icon {
    font-size: 24px;
    margin-right: 16px;
    min-width: 32px;
}

.info-details h3 {
    font-size: 14px;
    color: #999999;
    margin-bottom: 4px;
    font-weight: normal;
}

.info-details p {
    font-size: 16px;
    color: #333333;
}

.contact-form-wrapper {
    background-color: #ffffff;
    padding: 40px;
    border-radius: 8px;
    border: 1px solid #E8E8E8;
}

.contact-form-title {
    font-size: 24px;
    color: #333333;
    margin-bottom: 32px;
}

.contact-form .form-group {
    margin-bottom: 24px;
}

.contact-form label {
    display: block;
    font-size: 14px;
    color: #333333;
    margin-bottom: 8px;
    font-weight: 500;
}

.required {
    color: #ff4d4f;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #E8E8E8;
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #1890FF;
    box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.1);
}

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

.error-message {
    display: block;
    color: #ff4d4f;
    font-size: 12px;
    margin-top: 4px;
    min-height: 16px;
}

.btn-submit {
    width: 100%;
    padding: 14px;
    font-size: 16px;
}

.form-success {
    background-color: #f6ffed;
    border: 1px solid #b7eb8f;
    color: #52c41a;
    padding: 16px;
    border-radius: 4px;
    margin-bottom: 24px;
    display: none;
}

.form-success.show {
    display: block;
}