/* 基础样式 */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 头部样式 */
header {
    background: #4CAF50;
    color: white;
    padding: 20px 0;
    text-align: center;
}

    header h1 {
        margin: 0;
    }

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
}

    nav ul li {
        margin: 0 15px;
    }

        nav ul li a {
            color: white;
            text-decoration: none;
        }

/* 主体内容样式 */
section {
    padding: 40px 0;
}

h2 {
    color: #4CAF50;
}

.app {
    margin-bottom: 30px;
}

    .app h3 {
        color: #333;
    }

    .app a {
        color: #4CAF50;
        text-decoration: none;
        font-weight: bold;
    }

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

    table th, table td {
        border: 1px solid #ddd;
        padding: 10px;
        text-align: center;
    }

    table th {
        background: #f4f4f4;
    }

footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}

    footer ul {
        list-style: none;
        padding: 0;
        display: flex;
        justify-content: center;
    }

        footer ul li {
            margin: 0 15px;
        }

            footer ul li a {
                color: white;
                text-decoration: none;
            }

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
    }

    table {
        display: block;
        overflow-x: auto;
    }
}