/**
 * 基础样式
 */

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f7f6;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    background-color: #4CAF50;
    color: white;
    padding: 15px 20px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-tabs, .nav-menu {
    display: flex;
    justify-content: center;
    background-color: #333;
    padding: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    flex-wrap: wrap;
    gap: 5px;
}

.nav-tab, .nav-item {
    padding: 10px 15px;
    color: white;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 4px;
    font-size: 14px;
    white-space: nowrap;
    background: none;
    border: none;
    font-family: inherit;
}

.nav-tab:hover, .nav-tab.active,
.nav-item:hover, .nav-item.active {
    background-color: #555;
}

.container {
    flex-grow: 1;
    max-width: 1200px;
    width: 90%;
    margin: 20px auto;
    padding: 20px;
    background-color: white;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    border-radius: 8px;
}

.section {
    display: none;
    padding: 20px 0;
}

.section.active {
    display: block;
}

h2 {
    color: #4CAF50;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 15px 0;
    margin-top: 20px;
    box-shadow: 0 -2px 5px rgba(0,0,0,0.2);
}