/* 全局样式重置 */
* {
    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: #f8f9fa;
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 颜色方案 */
:root {
    --primary-color: #007bff;
    --secondary-color: #0056b3;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --gray-color: #6c757d;
    --success-color: #28a745;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* 头部样式 */
.header {
    background-color: #fff;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 24px;
    font-weight: 700;
}

.nav-list {
    display: flex;
    list-style: none;
}

.nav-link {
    color: var(--dark-color);
    text-decoration: none;
    padding: 0 15px;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

.language-switcher {
    display: flex;
    gap: 10px;
}

.language-btn {
    background-color: var(--light-color);
    border: 1px solid var(--gray-color);
    border-radius: var(--border-radius);
    padding: 5px 10px;
    cursor: pointer;
    transition: var(--transition);
}

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

/* 英雄区域样式 */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    padding: 100px 0;
    text-align: center;
}

.hero-content h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #fff;
}

.hero-content p {
    font-size: 18px;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cta-btn {
    display: inline-block;
    background-color: #fff;
    color: var(--primary-color);
    padding: 12px 30px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

.cta-btn:hover {
    background-color: var(--light-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* 通用内容区域样式 */
section {
    padding: 80px 0;
}

h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--dark-color);
}

/* 关于我们样式 */
.about {
    background-color: #fff;
}

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

.about-content p {
    margin-bottom: 20px;
    font-size: 16px;
    color: var(--gray-color);
}

/* 服务项目样式 */
.services {
    background-color: var(--light-color);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.service-card {
    background-color: #fff;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

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

.service-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.service-card p {
    color: var(--gray-color);
}

/* 我们的优势样式 */
.advantages {
    background-color: #fff;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.advantage-card {
    background-color: var(--light-color);
    padding: 30px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.advantage-card:hover {
    background-color: var(--primary-color);
    color: #fff;
    transform: translateY(-5px);
}

.advantage-card:hover h3,
.advantage-card:hover p {
    color: #fff;
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.advantage-card p {
    color: var(--gray-color);
}

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

.contact-content {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    margin-top: 40px;
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

.contact-info p {
    margin-bottom: 15px;
    color: var(--gray-color);
}

.contact-form {
    flex: 1;
    min-width: 300px;
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-form input,
.contact-form textarea {
    padding: 12px;
    border: 1px solid var(--gray-color);
    border-radius: var(--border-radius);
    font-size: 16px;
}

.contact-form textarea {
    resize: vertical;
    min-height: 150px;
}

.contact-form button {
    background-color: var(--primary-color);
    color: #fff;
    padding: 12px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.contact-form button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

/* 页脚样式 */
.footer {
    background-color: var(--dark-color);
    color: #fff;
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo,
.footer-nav,
.footer-contact {
    flex: 1;
    min-width: 200px;
}

.footer-logo h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-logo p {
    color: var(--gray-color);
}

.footer-nav h4,
.footer-contact h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
}

.footer-nav ul {
    list-style: none;
}

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

.footer-nav a {
    color: var(--gray-color);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-contact p {
    color: var(--gray-color);
    margin-bottom: 10px;
}

.footer-bottom {
    border-top: 1px solid var(--gray-color);
    padding-top: 30px;
    text-align: center;
    color: var(--gray-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
        padding: 15px 0;
    }

    .nav-list {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }

    .nav-link {
        padding: 0 10px;
    }

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

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

    section {
        padding: 60px 0;
    }

    h2 {
        font-size: 28px;
    }

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

    .contact-content {
        flex-direction: column;
    }

    .footer-content {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-content h2 {
        font-size: 28px;
    }

    .hero-content p {
        font-size: 14px;
    }

    .cta-btn {
        padding: 10px 20px;
    }

    h2 {
        font-size: 24px;
    }

    .service-card,
    .advantage-card {
        padding: 20px;
    }

    .contact-form input,
    .contact-form textarea {
        padding: 10px;
    }
}

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

.service-card,
.advantage-card {
    animation: fadeIn 0.5s ease forwards;
}

.service-card:nth-child(2) {
    animation-delay: 0.1s;
}

.service-card:nth-child(3) {
    animation-delay: 0.2s;
}

.service-card:nth-child(4) {
    animation-delay: 0.3s;
}

.service-card:nth-child(5) {
    animation-delay: 0.4s;
}

.advantage-card:nth-child(2) {
    animation-delay: 0.1s;
}

.advantage-card:nth-child(3) {
    animation-delay: 0.2s;
}

.advantage-card:nth-child(4) {
    animation-delay: 0.3s;
}

.advantage-card:nth-child(5) {
    animation-delay: 0.4s;
}

.advantage-card:nth-child(6) {
    animation-delay: 0.5s;
}