/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2c3e50;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: #3498db;
    border-radius: 2px;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.navbar-brand span {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #34495e;
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 1rem;
}

.nav-link:hover, .nav-link.active {
    color: #3498db;
}

/* 语言选择器 */
.language-selector {
    display: flex;
    gap: 5px;
}

.lang-btn {
    padding: 5px 10px;
    border: 1px solid #ddd;
    background-color: transparent;
    color: #333;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.lang-btn:hover, .lang-btn.active {
    background-color: #3498db;
    color: white;
    border-color: #3498db;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background-color: #333;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    z-index: 999;
    padding: 20px 0;
}

.mobile-menu.active {
    display: block;
}

#mobile-nav-list {
    list-style: none;
    text-align: center;
}

.mobile-nav-item {
    margin: 15px 0;
}

.mobile-nav-link {
    text-decoration: none;
    color: #34495e;
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.mobile-nav-link:hover, .mobile-nav-link.active {
    color: #3498db;
}

/* Banner轮播图样式 */
.banner-section {
    padding: 0;
    margin-top: 70px;
}

.carousel {
    position: relative;
    width: 100%;
    height: 600px;
    overflow: hidden;
}

.carousel-slides {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    padding: 50px;
    text-align: center;
}

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

.carousel-caption p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
}

.carousel-controls {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 10;
}

.carousel-btn {
    width: 50px;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.3);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.carousel-btn:hover {
    background-color: rgba(255, 255, 255, 0.6);
}

.carousel-indicators {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.indicator {
    width: 12px;
    height: 12px;
    background-color: rgba(255, 255, 255, 0.5);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.indicator.active {
    background-color: white;
    width: 30px;
    border-radius: 6px;
}

/* 产品列表样式 */
.products-section {
    background-color: white;
}

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

.product-item {
    background-color: #f8f9fa;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

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

.product-image-container {
    height: 200px;
    overflow: hidden;
}

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

.product-item:hover .product-image {
    transform: scale(1.1);
}

.product-info {
    padding: 20px;
}

.product-name {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #2c3e50;
}

.product-description {
    color: #666;
    line-height: 1.6;
}

/* 公司介绍样式 */
.about-section {
    background-color: #f8f9fa;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
}

/* 联系我们样式 */
.contact-section {
    background-color: white;
}

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

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.1rem;
    color: #555;
}

.contact-info p {
    margin: 15px 0;
}

/* 页脚样式 */
.footer {
    background-color: #2c3e50;
    color: white;
    padding: 30px 0;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .carousel-caption h2 {
        font-size: 2rem;
    }
    
    .carousel-caption p {
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    /* 导航栏 */
    .nav-menu {
        display: none;
    }
    
    .language-selector {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    /* Banner */
    .carousel {
        height: 500px;
    }
    
    .carousel-caption {
        padding: 30px;
    }
    
    .carousel-caption h2 {
        font-size: 1.8rem;
    }
    
    .carousel-caption p {
        font-size: 0.9rem;
    }
    
    /* 产品列表 */
    .products-list {
        grid-template-columns: 1fr;
    }
    
    /* 移动端语言选择器 */
    .mobile-menu .language-selector {
        display: flex;
        justify-content: center;
        margin: 20px 0;
    }
}

@media (max-width: 576px) {
    /* 基础样式 */
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    /* Banner */
    .carousel {
        height: 400px;
    }
    
    .carousel-caption {
        padding: 20px;
    }
    
    .carousel-caption h2 {
        font-size: 1.5rem;
    }
    
    .carousel-caption p {
        font-size: 0.8rem;
    }
    
    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    /* 导航栏 */
    .navbar-brand span {
        font-size: 1.2rem;
    }
    
    .navbar-brand img {
        height: 40px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* 滚动到顶部按钮 */
.scroll-top-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top-btn:hover {
    background-color: #2980b9;
    transform: translateY(-5px);
}