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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

header {
    background-color: #4a88d8;
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    margin-bottom: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

#content-container {
    display: flex;
    flex-direction: column;
    gap: 1rem; /* 从2rem减小到1rem */
    margin-bottom: 2rem; /* 从3rem减小到2rem */
}

.content-block {
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 1rem; /* 从1.5rem减小到1rem */
    overflow: hidden;
}

.text-content {
    font-size: 1rem;
    line-height: 1.7;
}

.image-content {
    text-align: center;
}

.image-content img {
    max-width: 100%;
    height: auto;
    border-radius: 3px;
}

.video-content {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 ratio */
    height: 0;
    overflow: hidden;
}

.video-content video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 3px;
}

footer {
    text-align: center;
    padding: 1.5rem;
    background-color: #333;
    color: white;
    margin-top: 2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header {
        padding: 1.5rem 1rem;
    }
    
    .content-block {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .content-block {
        padding: 0.8rem;
    }
}