body {
    font-family: 'Arial', sans-serif;
    text-align: center;
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: url('https://api.paugram.com/bing'); /* 替换为您的背景图片URL */
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative; /* 为了在背景上添加遮罩层 */
}
h1 {
    font-size: 36px;
    margin-bottom: 10px;
}
.countdown {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
}
.greeting {
    font-size: 24px;
    margin-top: 20px;
    display: none;
}
.hitokoto {
    font-size: 20px;
    margin-top: 30px;
    font-style: italic;
}
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.7); /* 浅灰色遮罩 */
    z-index: 1;
}
footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 10px;
    text-align: center;
    box-sizing: border-box;
    z-index: 2; /* 设置页脚的z-index，高于遮罩层 */
}
.content {
    position: relative;
    z-index: 2;
    padding-bottom: 60px; /* 根据页脚高度调整 */
}
.dynamic-color {
    animation: colorChange 10s infinite;
}
@keyframes colorChange {
    0% { color: #ff0000; }
    14% { color: #ff7f00; }
    28% { color: #ffff00; }
    42% { color: #00ff00; }
    56% { color: #0000ff; }
    70% { color: #4b0082; }
    84% { color: #9400d3; }
    100% { color: #ff0000; }
}
.auto-color {
    color: black; /* 默认颜色为黑色 */
    transition: color 0.5s ease;
}