body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

.header {
    background-color: #2c3e50;
    color: white;
    padding: 40px;
    text-align: center;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.footer {
    text-align: center;
    padding: 30px;
    background-color: #2c3e50;
    color: white;
    margin-top: 40px;
}

/* 导航栏样式 */
.top-nav {
    background-color: #2c3e50;
    padding: 15px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-link {
    color: white;
    padding: 12px 25px;
    text-decoration: none;
    margin: 0 10px;
    border-radius: 20px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-link:hover {
    background-color: #34495e;
    transform: translateY(-2px);
}

.nav-link.active {
    background-color: #3498db;
    box-shadow: 0 2px 8px rgba(52,152,219,0.3);
}

/* 公共组件样式 */
.download-link {
    color: #3498db;
    text-decoration: none;
    font-weight: bold;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.download-link:hover {
    border-bottom-color: #3498db;
}

.download-btn {
    display: inline-block;
    background-color: #2ecc71;
    color: white;
    padding: 12px 24px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: #27ae60;
}

/* 公共动画效果 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}