/* 全局重置 */
* {
    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: #f4f7f6;
}

/* 通用工具类 */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.content-section {
    padding: 60px 0;
}

.bg-light {
    background-color: #fff;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: #2c3e50;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background-color: #3498db;
    margin: 10px auto 0;
}

/* 导航栏 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #3498db;
}

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

.nav-menu li {
    margin-left: 25px;
}

.nav-menu a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #3498db;
}

/* 首屏 Hero */
.hero-section {
    height: 500px;
    background: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.4)), url('https://picsum.photos/1600/900?dog,puppy') no-repeat center center/cover;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 15px;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

.hero-text p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

.cta-button {
    display: inline-block;
    padding: 12px 30px;
    background-color: #3498db;
    color: #fff;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
    transition: background 0.3s, transform 0.2s;
}

.cta-button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

/* 卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.card h3 {
    padding: 20px 20px 10px;
    color: #2c3e50;
}

.card p {
    padding: 0 20px 20px;
    color: #666;
    font-size: 0.9rem;
}

/* 信息列表 */
.info-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.info-item {
    padding: 25px;
    border: 1px solid #eee;
    border-radius: 8px;
    background-color: #fafafa;
}

.info-item h3 {
    margin-bottom: 10px;
    color: #3498db;
}

/* 页脚 */
.footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 50px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.footer-info, .footer-contact {
    margin-bottom: 20px;
}

.footer h4 {
    margin-bottom: 15px;
    color: #fff;
}

.footer p {
    font-size: 0.9rem;
    color: #bdc3c7;
    margin-bottom: 5px;
}

.copyright {
    text-align: center;
    border-top: 1px solid #34495e;
    padding-top: 20px;
    font-size: 0.8rem;
    color: #7f8c8d;
}

/* 响应式适配 */
@media (max-width: 768px) {
    .nav-menu {
        display: none; /* 简化处理，移动端隐藏菜单 */
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}