* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-padding-top: 100px;
}
body {
    font-family: "Microsoft YaHei", Arial, sans-serif;
    background-color: #f5f5f5;
}
.announcement-item {
    padding: 15px;
    margin-bottom: 10px;
    background-color: #f8f8f8;
    border-left: 3px solid #009688;
    border-radius: 2px;
}
.announcement-item strong {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-size: 14px;
}
.announcement-item div {
    color: #666;
    font-size: 13px;
    line-height: 1.6;
}
.footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 30px 20px;
    margin-top: 50px;
}
.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}
.footer-links a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    opacity: 0.9;
    transition: opacity 0.3s;
}
.footer-links a:hover {
    opacity: 1;
}
.task-card {
    margin-bottom: 15px;
}