/* 基础样式 */
:root {
    --primary-color: #0066CC;
    --secondary-color: #00AAFF;
    --accent-color: #FF6600;
    --text-color: #333333;
    --light-text: #666666;
    --bg-color: #FFFFFF;
    --light-bg: #F5F7FA;
    --border-color: #E5E8ED;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --border-radius: 4px;
    --container-width: 1200px;
}

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

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

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

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 15px;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
    color: var(--text-color);
    position: relative;
}

.section-title:after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 15px auto 0;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

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

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

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 100px;
    width: auto;
    object-fit: contain;
}

.logo h1 {
    margin-left: 10px;
    font-size: 1.5rem;
    color: var(--primary-color);
}

nav ul {
    display: flex;
    align-items: center;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: var(--text-color);
    font-weight: 500;
    padding: 5px 0;
    position: relative;
}

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

nav ul li a:hover:after,
nav ul li.active a:after {
    width: 100%;
}

nav ul li.active a {
    color: var(--primary-color);
}

.language-selector select {
    padding: 5px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: white;
    cursor: pointer;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 英雄区域样式 */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../images/hero.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 100px 0;
    text-align: center;
}

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

.hero h2 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

/* 特性区域样式 */
.features {
    padding: 80px 0;
    background-color: var(--light-bg);
}

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

.feature-card {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
}

/* 产品预览区域样式 */
.products-preview {
    padding: 80px 0;
}

.product-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.product-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.product-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-card h3 {
    padding: 20px 20px 10px;
}

.product-card p {
    padding: 0 20px 20px;
}

.product-card .btn-small {
    margin: 0 20px 20px;
}

/* 客户评价区域样式 */
.testimonials {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.testimonial-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.quote {
    font-style: italic;
    margin-bottom: 20px;
    position: relative;
}

.quote:before {
    content: '\201C';
    font-size: 4rem;
    position: absolute;
    left: -20px;
    top: -20px;
    color: var(--primary-color);
    opacity: 0.2;
}

.author {
    display: flex;
    align-items: center;
}

.author-info h4 {
    margin-bottom: 5px;
}

.author-info p {
    color: var(--light-text);
}

/* CTA区域样式 */
.cta {
    padding: 80px 0;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.cta p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

.cta .btn {
    background-color: white;
    color: var(--primary-color);
}

.cta .btn:hover {
    background-color: var(--accent-color);
    color: white;
}

/* 页面头部样式 */
.page-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../images/page-header.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-header h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

/* 关于我们页面样式 */
.about-intro {
    padding: 80px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text h2 {
    margin-bottom: 20px;
}

.about-text p {
    margin-bottom: 15px;
}

.image-container {
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
}

.mission-vision {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.mission-vision .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.mission, .vision {
    background-color: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}

.mission i, .vision i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.values {
    padding: 80px 0;
}

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

.value-card {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
}

.value-card:hover {
    transform: translateY(-10px);
}

.value-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.milestones {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline:before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 3px;
    background-color: var(--primary-color);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    top: 0;
    width: 20px;
    height: 20px;
    background-color: var(--primary-color);
    border-radius: 50%;
    transform: translateX(-50%);
}

.timeline-content {
    width: 45%;
    padding: 20px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: auto;
}

.team {
    padding: 80px 0;
}

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

.team-member {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    text-align: center;
    transition: var(--transition);
}

.team-member:hover {
    transform: translateY(-10px);
}

.member-photo {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.team-member h3 {
    margin: 20px 0 5px;
}

.member-title {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
}

.team-member p {
    padding: 0 20px 20px;
}

/* 产品页面样式 */
.product-categories {
    padding: 30px 0;
    background-color: var(--light-bg);
}

.category-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
}

.tab-btn {
    padding: 10px 20px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover, .tab-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.product-section {
    padding: 80px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.product-header h2 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
    margin-bottom: 50px;
}

.product-features {
    margin: 20px 0;
}

.product-features li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.product-features li i {
    color: var(--success-color);
    margin-right: 10px;
}

.product-actions {
    display: flex;
    gap: 15px;
}

.product-applications h3 {
    text-align: center;
    margin-bottom: 30px;
}

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

.application-card {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
}

.application-card:hover {
    transform: translateY(-5px);
}

.application-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* 联系我们页面样式 */
.contact-info {
    padding: 80px 0;
    background-color: var(--light-bg);
}

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

.contact-card {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-5px);
}

.contact-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.contact-form-section {
    padding: 80px 0;
}

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

.form-container h2, .map-container h2 {
    margin-bottom: 20px;
}

.form-container p {
    margin-bottom: 30px;
}

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

.contact-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.contact-form input, .contact-form select, .contact-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.map {
    height: 768;
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    margin-bottom: 20px;
}

.map-placeholder {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--light-text);
}

.office-info {
    background-color: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.office-info h3 {
    margin-bottom: 10px;
}

.office-info p {
    margin-bottom: 5px;
}

.global-offices {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.offices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.office-card {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}

.office-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.faq-section {
    padding: 80px 0;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    background-color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-question h3 {
    margin: 0;
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 20px;
    max-height: 500px;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

/* 页脚样式 */
footer {
    background-color: #222;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.footer-logo img {
    height: 100px;
    width: auto;
    object-fit: contain;
    margin-bottom: 15px;
    filter: brightness(0) invert(1); /* 在深色背景下使logo变为白色 */
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.footer-section h4 {
    margin-bottom: 20px;
    position: relative;
}

.footer-section h4:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--primary-color);
}

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

.footer-section ul li a {
    color: #ccc;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-section ul li i {
    margin-right: 10px;
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid #eee;
    margin-top: 30px;
}

.footer-bottom p {
    margin: 0;
    color: #666;
    font-size: 14px;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: #333;
    color: white;
    border-radius: 50%;
    transition: var(--transition);
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .about-content,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .product-detail {
        grid-template-columns: 1fr;
    }
    
    .timeline:before {
        left: 30px;
    }
    
    .timeline-dot {
        left: 30px;
    }
    
    .timeline-content {
        width: 85%;
        margin-left: 60px !important;
    }
}

@media (max-width: 768px) {
    nav ul {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
    }
}