/* 全局样式 */
:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --dark-color: #333;
    --light-color: #f4f4f4;
    --danger-color: #dc3545;
    --success-color: #28a745;
    --max-width: 1200px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    overflow: hidden;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: #3367d6;
}

.btn-secondary {
    background-color: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

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

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

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

.section-header h2 {
    font-size: 36px;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.section-header p {
    font-size: 18px;
    color: #666;
}

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

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

.logo a {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-img {
    height: 40px;
    margin-right: 10px;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    font-size: 16px;
    font-weight: 500;
    padding: 10px 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: width 0.3s ease;
}

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

.language-switch {
    display: flex;
    align-items: center;
}

.language-switch a {
    margin: 0 5px;
    font-size: 14px;
    font-weight: 500;
}

.language-switch a.active {
    color: var(--primary-color);
}

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

/* 首页横幅 */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../images/hero-bg.jpg') no-repeat center center/cover;
    height: 100vh;
    color: #fff;
    display: flex;
    align-items: center;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.hero-content h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

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

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* 公司简介 */
.intro {
    padding: 80px 0;
    background-color: #f9f9f9;
}

.intro-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.intro-content h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.intro-content p {
    font-size: 18px;
    color: #666;
    line-height: 1.8;
}

/* 产品展示 */
.products {
    padding: 100px 0;
}

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

.product-card {
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.product-image {
    height: 250px;
    overflow: hidden;
}

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

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

.product-info {
    padding: 20px;
    text-align: center;
}

.product-info h3 {
    font-size: 24px;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.product-info p {
    font-size: 16px;
    color: #666;
    margin-bottom: 20px;
}

/* 公司价值观 */
.values {
    padding: 100px 0;
    background-color: #f9f9f9;
}

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

.value-card {
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

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

.value-icon {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.value-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.value-card p {
    font-size: 16px;
    color: #666;
    line-height: 1.6;
}

/* 关于我们 */
.about {
    padding: 100px 0;
}

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

.about-image img {
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.about-text h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.about-text p {
    font-size: 16px;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.8;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background-color: #f9f9f9;
}

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

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

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

.contact-item i {
    font-size: 24px;
    color: var(--primary-color);
}

.contact-item h3 {
    font-size: 20px;
    margin-bottom: 5px;
    color: var(--dark-color);
}

.contact-item p {
    font-size: 16px;
    color: #666;
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

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

.form-group textarea {
    height: 150px;
    resize: none;
}

/* 页脚 */
footer {
    background-color: #222;
    color: #fff;
    padding: 80px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.footer-logo img {
    height: 50px;
    margin-bottom: 15px;
}

.footer-logo p {
    font-size: 14px;
    color: #aaa;
}

.footer-links h3,
.footer-products h3,
.footer-social h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #fff;
}

.footer-links ul li,
.footer-products ul li {
    margin-bottom: 10px;
}

.footer-links ul li a,
.footer-products ul li a {
    color: #aaa;
    transition: color 0.3s ease;
}

.footer-links ul li a:hover,
.footer-products ul li a:hover {
    color: var(--primary-color);
}

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

.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: #333;
    border-radius: 50%;
    color: #fff;
    transition: background-color 0.3s ease;
}

.social-icons a:hover {
    background-color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: 2;
    }
    
    .about-text {
        order: 1;
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    nav {
        width: 100%;
        margin-top: 20px;
    }
    
    nav ul {
        flex-direction: column;
    }
    
    nav ul li {
        margin: 10px 0;
    }
    
    .language-switch {
        margin-top: 20px;
    }
    
    .hero-content h1 {
        font-size: 36px;
    }
    
    .hero-content h2 {
        font-size: 28px;
    }
    
    .hero-content p {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .intro-content h2 {
        font-size: 28px;
    }
    
    .intro-content p {
        font-size: 16px;
    }
}

@media (max-width: 576px) {
    .menu-toggle {
        display: block;
    }
    
    nav {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 28px;
    }
    
    .hero-content h2 {
        font-size: 24px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .section-header h2 {
        font-size: 24px;
    }
    
    .intro-content h2 {
        font-size: 24px;
    }
    
    .product-grid,
    .values-grid {
        grid-template-columns: 1fr;
    }
}