/* 全局样式 - 导航栏 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    min-height: 100vh;
    margin: 0;
}

/* 顶部导航栏 */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: #1a1a1a;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
    z-index: 1000;
}

.top-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.top-nav li {
    margin: 0;
}

.top-nav .nav-link {
    display: inline-block;
    padding: 10px 20px;
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.top-nav .nav-link:hover {
    background-color: #333;
}

.top-nav .nav-link.active {
    background-color: #444;
    color: #ff6b6b;
}