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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* 顶部图片区域 */
.hero-section {
    position: relative;
    height: 100vh;
    background-image: url('https://images.unsplash.com/photo-1512941937669-90a1b58e7e9c?ixlib=rb-4.0.3&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-content p {
    font-size: 1.5rem;
    margin-bottom: 30px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.btn {
    display: inline-block;
    padding: 15px 30px;
    background-color: #4CAF50;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-size: 1.2rem;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #45a049;
}

/* 卡片式布局区域 */
.projects-section {
    padding: 80px 0;
    background-color: white;
}

.projects-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #333;
}

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

.project-card {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

.card-image {
    height: 200px;
    background-image: url('https://images.unsplash.com/photo-1555949963-aa79dcee981c?ixlib=rb-4.0.3&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
}

.card-content {
    padding: 25px;
}

.card-content h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #333;
}

.card-content p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.8;
}

.video-link {
    margin-bottom: 20px;
    text-align: center;
}

.card-btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #2196F3;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.card-btn:hover {
    background-color: #1976D2;
}

/* 底部信息区域 */
.info-section {
    padding: 80px 0;
    background-color: #f5f5f5;
}

.info-item {
    margin-bottom: 60px;
}

.info-item h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 40px;
    color: #333;
}

.info-content {
    max-width: 800px;
    margin: 0 auto;
}

.info-point {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
    background-color: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.info-icon {
    font-size: 2rem;
    margin-right: 20px;
    color: #4CAF50;
    min-width: 50px;
    text-align: center;
}

.info-text h4 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

.info-text p {
    color: #666;
    line-height: 1.8;
}

/* 页脚区域 */
.footer {
    background-color: #333;
    color: white;
    padding: 40px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

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

.footer-right p {
    margin-bottom: 15px;
    font-weight: bold;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.contact-info a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-info a:hover {
    color: #4CAF50;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-content p {
        font-size: 1.2rem;
    }

    .projects-section h2,
    .info-item h2 {
        font-size: 2rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        padding: 0 20px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-right {
        margin-top: 20px;
    }

    .info-point {
        flex-direction: column;
        text-align: center;
    }

    .info-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 1rem;
    }

    .projects-section h2,
    .info-item h2 {
        font-size: 1.8rem;
    }

    .card-content h3 {
        font-size: 1.5rem;
    }

    .info-text h4 {
        font-size: 1.3rem;
    }
}