/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* 导航栏 */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

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

.logo h1 {
    font-size: 24px;
    color: #667eea;
}

.nav ul {
    display: flex;
    gap: 30px;
}

.nav a {
    color: #333;
    font-weight: 500;
    padding: 8px 0;
    transition: color 0.3s;
}

.nav a:hover,
.nav a.active {
    color: #667eea;
}

.menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* Banner */
.banner {
    margin-top: 70px;
    height: 500px;
    position: relative;
    overflow: hidden;
}

.banner-slide {
    width: 100%;
    height: 100%;
    position: relative;
}

.banner-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff;
    z-index: 2;
}

.banner-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.banner-content p {
    font-size: 20px;
    margin-bottom: 30px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: #667eea;
    color: #fff;
    border-radius: 5px;
    font-weight: 500;
    transition: background 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: #5a6fd6;
}

.btn-outline {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
}

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

.btn-link {
    color: #667eea;
    font-weight: 500;
}

.btn-link:hover {
    text-decoration: underline;
}

/* 通用区块 */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #667eea;
    margin: 15px auto 0;
}

.text-center {
    text-align: center;
}

/* 关于我们 */
.about-section {
    background: #f8f9fa;
}

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

.about-text p {
    margin-bottom: 20px;
    color: #666;
}

.about-image img {
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* 产品展示 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.product-card {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.product-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.product-info {
    padding: 20px;
}

.product-info h3 {
    margin-bottom: 10px;
    color: #333;
}

.product-info p {
    color: #666;
    margin-bottom: 15px;
}

/* 优势特点 */
.features-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.features-section .section-title {
    color: #fff;
}

.features-section .section-title::after {
    background: #fff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 30px;
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    transition: background 0.3s;
}

.feature-item:hover {
    background: rgba(255,255,255,0.2);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-item h3 {
    margin-bottom: 15px;
    font-size: 20px;
}

.feature-item p {
    color: rgba(255,255,255,0.9);
}

/* 页头 */
.page-header {
    margin-top: 70px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-align: center;
    padding: 60px 0;
}

.page-header h1 {
    font-size: 42px;
    margin-bottom: 15px;
}

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

/* 内容区块 */
.content-section {
    padding: 60px 0;
}

/* 关于我们详细 */
.about-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-img img {
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.about-text h2 {
    font-size: 28px;
    margin-bottom: 20px;
    color: #333;
}

.about-text p {
    margin-bottom: 15px;
    color: #666;
}

/* 企业文化 */
.culture-section {
    background: #f8f9fa;
}

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

.culture-item {
    background: #fff;
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.culture-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #667eea;
}

.culture-item p {
    color: #666;
}

/* 发展历程 */
.timeline {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-item {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 80px;
    top: 40px;
    bottom: -40px;
    width: 2px;
    background: #ddd;
}

.timeline-item:last-child::before {
    display: none;
}

.timeline-year {
    min-width: 100px;
    text-align: right;
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
}

.timeline-content {
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    flex: 1;
}

.timeline-content h3 {
    margin-bottom: 10px;
    color: #333;
}

.timeline-content p {
    color: #666;
}

/* 产品详细列表 */
.products-grid-large {
    display: grid;
    gap: 50px;
}

.product-card-large {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.product-card-large:nth-child(even) {
    direction: rtl;
}

.product-card-large:nth-child(even) > * {
    direction: ltr;
}

.product-image-large img {
    width: 100%;
    height: 100%;
    min-height: 300px;
    object-fit: cover;
}

.product-info-large {
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.product-info-large h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #333;
}

.product-desc {
    color: #666;
    margin-bottom: 20px;
}

.product-features {
    margin-bottom: 25px;
}

.product-features li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    color: #666;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

/* 联系我们 */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info h2,
.contact-form-wrapper h2 {
    font-size: 24px;
    margin-bottom: 30px;
    color: #333;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-icon {
    font-size: 32px;
}

.contact-detail h4 {
    margin-bottom: 8px;
    color: #333;
}

.contact-detail p {
    color: #666;
    margin-bottom: 5px;
}

/* 表单样式 */
.contact-form {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.btn-submit {
    width: 100%;
    padding: 15px;
    font-size: 18px;
}

/* 地图区域 */
.map-section {
    background: #f8f9fa;
    padding: 60px 0;
}

.map-placeholder {
    background: #ddd;
    height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 10px;
    color: #666;
}

/* 页脚 */
.footer {
    background: #333;
    color: #fff;
    padding: 60px 0 20px;
}

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

.footer-section h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #667eea;
}

.footer-section p,
.footer-section a {
    color: #ccc;
    margin-bottom: 10px;
    display: block;
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #555;
    color: #999;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .about-content,
    .about-detail,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .culture-grid {
        grid-template-columns: 1fr;
    }

    .product-card-large {
        grid-template-columns: 1fr;
    }

    .product-card-large:nth-child(even) {
        direction: ltr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #fff;
        box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    }

    .nav.active {
        display: block;
    }

    .nav ul {
        flex-direction: column;
        padding: 20px;
        gap: 15px;
    }

    .banner {
        height: 300px;
    }

    .banner-content h2 {
        font-size: 28px;
    }

    .banner-content p {
        font-size: 16px;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .timeline-item {
        flex-direction: column;
        gap: 15px;
    }

    .timeline-item::before {
        display: none;
    }

    .timeline-year {
        text-align: left;
    }
}