/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* 导航栏 */
header {
    background: #fff;
    box-shadow: 0 2px 4px 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: 20px 0;
}

.logo h1 {
    font-size: 24px;
    color: #333;
}

.logo p {
    font-size: 14px;
    color: #666;
    margin-top: 5px;
}

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

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

nav ul li a {
    text-decoration: none;
    color: #333;
    font-size: 16px;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #007bff;
}

.contact-phone {
    font-size: 16px;
    font-weight: bold;
    color: #007bff;
}

/* Banner 样式 */
.banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 150px 0 100px;
    text-align: center;
    margin-top: 80px;
}

.banner h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.banner p {
    font-size: 20px;
    margin-bottom: 40px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: #fff;
    color: #667eea;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: all 0.3s;
}

.btn:hover {
    background: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* 服务项目 */
.services {
    padding: 100px 0;
    background: #f8f9fa;
}

.section-title {
    font-size: 36px;
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

.section-subtitle {
    text-align: center;
    font-size: 16px;
    color: #666;
    margin-bottom: 60px;
}

.tech-stack {
    text-align: center;
    margin-bottom: 60px;
}

.tech-stack h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #333;
}

.tech-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
}

.tech-tags span {
    padding: 8px 20px;
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 50px;
    font-size: 14px;
    color: #333;
    transition: all 0.3s;
}

.tech-tags span:hover {
    background: #007bff;
    color: #fff;
    border-color: #007bff;
}

.service-categories h3 {
    font-size: 24px;
    text-align: center;
    margin-bottom: 40px;
    color: #333;
}

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

.category-item {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s;
}

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

.category-item::before {
    content: '';
    display: block;
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: white;
}

/* 为每个类别设置不同的颜色 */
.category-item:nth-child(1)::before {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    content: '🏠';
}

.category-item:nth-child(2)::before {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    content: '🛵';
}

.category-item:nth-child(3)::before {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    content: '💼';
}

.category-item:nth-child(4)::before {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    content: '🏭';
}

.category-item:nth-child(5)::before {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    content: '♻️';
}

.category-item:nth-child(6)::before {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    content: '🚛';
}

.category-item h4 {
    font-size: 18px;
    color: #333;
}

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

.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-text {
    flex: 1;
}

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 20px;
}

.about-image {
    flex: 1;
}

.about-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background: #f8f9fa;
}

.contact-content {
    display: flex;
    gap: 50px;
}

.contact-info {
    flex: 1;
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.contact-info h3 {
    font-size: 24px;
    margin-bottom: 30px;
    color: #333;
}

.contact-info ul {
    list-style: none;
}

.contact-info ul li {
    margin-bottom: 20px;
    font-size: 16px;
    color: #666;
}

.contact-form {
    flex: 1;
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.contact-form h3 {
    font-size: 24px;
    margin-bottom: 30px;
    color: #333;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: #333;
    font-weight: bold;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #007bff;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚 */
footer {
    background: #333;
    color: #fff;
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-logo h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.footer-logo p {
    font-size: 14px;
    color: #999;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 16px;
    margin-bottom: 20px;
    color: #fff;
}

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

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

.footer-links ul li a {
    text-decoration: none;
    color: #999;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-links ul li a:hover {
    color: #fff;
}

.footer-contact p {
    font-size: 14px;
    color: #999;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #444;
    font-size: 14px;
    color: #999;
}

.footer-bottom p {
    margin-bottom: 10px;
}

.footer-bottom p:last-child {
    margin-bottom: 0;
}

.footer-bottom a {
    color: #999;
    text-decoration: none;
    transition: color 0.3s;
}

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

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        width: 95%;
    }
}

@media (max-width: 992px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content,
    .contact-content {
        flex-direction: column;
        text-align: center;
    }
    
    .about-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        padding: 15px 0;
    }
    
    nav ul {
        margin: 15px 0;
    }
    
    nav ul li {
        margin: 0 15px;
    }
    
    .banner h2 {
        font-size: 36px;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }
}