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

:root {
    --primary-color: #0066cc;
    --secondary-color: #004999;
    --text-color: #333;
    --light-gray: #f5f5f5;
    --border-color: #e0e0e0;
    --white: #ffffff;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: all 0.3s;
}

/* 导航操作区 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* 语言切换按钮 */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 25px;
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.lang-switch::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.lang-switch:hover::before {
    left: 100%;
}

.lang-switch:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.lang-switch:active {
    transform: translateY(0);
}

.lang-icon {
    font-size: 16px;
    animation: rotate 3s linear infinite;
}

@keyframes rotate {
    0%, 90%, 100% {
        transform: rotate(0deg);
    }
    95% {
        transform: rotate(20deg);
    }
}

.lang-text {
    font-family: 'Arial', sans-serif;
    letter-spacing: 0.5px;
}

/* 首页横幅 */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 100%),
                url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?w=1920&q=80') center/cover;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    position: relative;
    margin-top: 60px;
    padding: 80px 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    text-align: left;
}

.hero-content h1 {
    font-size: 60px;
    margin-bottom: 20px;
    font-weight: 700;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: 24px;
    margin-bottom: 40px;
    opacity: 0.95;
    text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.3);
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    border: 5px solid rgba(255, 255, 255, 0.2);
}

.btn-primary {
    display: inline-block;
    padding: 15px 40px;
    background: var(--white);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator span {
    display: block;
    width: 30px;
    height: 50px;
    border: 2px solid var(--white);
    border-radius: 25px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--white);
    border-radius: 50%;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { top: 10px; opacity: 1; }
    100% { top: 30px; opacity: 0; }
}

/* 动画 */
.fade-in {
    animation: fadeIn 1s ease-in;
}

.fade-in-delay {
    animation: fadeIn 1s ease-in 0.3s both;
}

.fade-in-delay-2 {
    animation: fadeIn 1s ease-in 0.6s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    color: var(--text-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* 关于我们 */
.about {
    background: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.about-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s;
}

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

.about-image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(0, 0, 0, 0.7));
    display: flex;
    align-items: flex-end;
    padding: 30px;
}

.about-badge {
    background: var(--white);
    padding: 20px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.about-badge span {
    font-size: 36px;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
}

.about-badge p {
    margin: 5px 0 0 0;
    font-size: 14px;
    color: #666;
}

.about-text p {
    margin-bottom: 20px;
    line-height: 1.8;
    text-align: justify;
    color: #555;
}

.about-stats-inline {
    display: flex;
    gap: 40px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid var(--border-color);
}

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

.stat-inline .stat-number {
    font-size: 36px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-inline .stat-label {
    font-size: 13px;
    color: #666;
}

/* 产品服务 */
.products {
    background: var(--light-gray);
}

/* 新闻预览 */
.news-preview {
    padding: 80px 0;
    background: var(--light-gray);
}

.news-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.news-preview-item {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s;
}

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

.news-preview-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.news-preview-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.news-preview-item:hover .news-preview-image img {
    transform: scale(1.1);
}

.news-preview-content {
    padding: 25px;
}

.news-preview-content h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text-color);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-preview-content p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-more {
    text-align: center;
}
.products {
    background: var(--light-gray);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s;
}

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

.product-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

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

.product-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.3));
}

.product-content {
    padding: 30px;
}

.product-content h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.product-content p {
    color: #666;
    line-height: 1.6;
    font-size: 15px;
}

/* 核心优势 */
.advantages {
    position: relative;
    overflow: hidden;
}

.advantages-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.advantages-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.3);
}

.advantages .container {
    position: relative;
    z-index: 1;
}

.section-title.light {
    color: var(--white);
}

.section-title.light::after {
    background: var(--white);
}

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

.advantage-item {
    position: relative;
    padding: 30px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.4s;
}

.advantage-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 1);
}

.advantage-icon {
    width: 100%;
    height: 150px;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 20px;
}

.advantage-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.advantage-item:hover .advantage-icon img {
    transform: scale(1.1);
}

.advantage-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 36px;
    font-weight: bold;
    color: var(--primary-color);
    opacity: 0.3;
}

.advantage-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.advantage-item p {
    color: #666;
    line-height: 1.6;
    font-size: 15px;
}

/* 联系我们 */
.contact {
    background: var(--light-gray);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.contact-item h4 {
    margin-bottom: 5px;
    color: var(--text-color);
}

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

.contact-form {
    background: var(--white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    font-family: inherit;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

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

.footer p {
    margin: 5px 0;
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-actions {
        gap: 15px;
    }

    .lang-switch {
        padding: 6px 15px;
        font-size: 13px;
    }

    .lang-icon {
        font-size: 14px;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 60px);
        background: var(--white);
        flex-direction: column;
        padding: 40px;
        transition: left 0.3s;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        left: 0;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

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

    .hero-content h1 {
        font-size: 40px;
    }

    .hero-content p {
        font-size: 18px;
    }

    .hero-image {
        order: -1;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-image {
        order: -1;
    }

    .about-image img {
        height: 350px;
    }

    .about-stats-inline {
        flex-direction: column;
        gap: 20px;
    }

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

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

    .advantage-item {
        padding: 25px;
    }

    .advantage-icon {
        height: 180px;
    }
}

@media (max-width: 480px) {
    .lang-switch {
        padding: 5px 12px;
        font-size: 12px;
    }

    .lang-icon {
        font-size: 13px;
    }

    .hero-content h1 {
        font-size: 32px;
    }

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

    .about-image img {
        height: 250px;
    }

    .product-image {
        height: 180px;
    }

    .advantage-icon {
        height: 150px;
    }
}