body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: Arial, sans-serif;
}

.background-image {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    z-index: -1; /* 确保背景图片在内容后面 */
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    padding: 20px;
}

.introduction {
    text-align: center;
    background-color: rgba(0, 0, 0, 0); /* 透明背景 */
    color: white;
    max-width: 600px; /* 设置最大宽度 */
    padding: 20px;
    opacity: 0;
    animation: fadeIn 1s ease forwards;
    animation-delay: 0.5s;
}

.introduction-title {
    font-size: 2em; /* 缩小标题字体 */
    margin-bottom: 10px;
    background: linear-gradient(to right, #add8e6, #ff69b4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: slideUp 1s ease forwards;
    animation-delay: 0.5s;
}

.introduction-line {
    width: 50%;
    height: 2px;
    background: linear-gradient(to right, #add8e6, #ff69b4);
    margin: 0 auto;
    margin-bottom: 20px;
    animation: slideUp 1s ease forwards;
    animation-delay: 0.5s;
}

.introduction-text {
    font-size: 1em; /* 缩小正文字体 */
    margin-bottom: 20px;
    opacity: 0;
    animation: fadeIn 1s ease forwards;
    animation-delay: 1.5s;
}

.introduction-button {
    display: inline-block;
    padding: 10px 20px;
    background-color: rgba(255, 255, 255, 0.3);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    opacity: 0;
    animation: fadeIn 1s ease forwards;
    animation-delay: 1.5s;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}