/* 全局样式 */
body {
    font-family: "等线", sans-serif;
    margin: 0;
    padding: 0;
}

/* 头部样式 */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background-color: white;
}

.site-title {
    font-size: 2 - 3em;
    font-family: 美术体;
}

.site-title p {
    margin: 0;
}

.main-menu {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.main-menu li {
    margin-left: 20px;
}

.main-menu a {
    text-decoration: none;
    color: black;
    font-weight: bold;
}

/* 导航栏样式 */
nav {
    background-color: #333;
    display: flex;
    justify-content: center;
    padding: 10px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
    font-size: 1.2em;
}

/* 首页内容样式 */
.section {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

.section img {
    width: 800px;
    height: 200px;
    margin-bottom: 10px;
}

/* 页脚样式 */
footer {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background-color: #f0f0f0;
    padding: 20px;
}

.footer-info {
    text-align: left;
}

.copyright {
    text-align: center;
    background-color: #333;
    color: white;
    padding: 10px;
    font-weight: bold;
}

/* 计算页样式 */
.calculate-nav {
    float: left;
    width: 20%;
    padding: 20px;
}

.calculate-nav ul {
    list-style-type: none;
    padding: 0;
}

.calculate-nav li {
    margin-bottom: 10px;
}

.calculate-content {
    float: left;
    width: 80%;
    padding: 20px;
}

.calculate-block {
    display: flex;
    margin-bottom: 20px;
}

.calculate-block img {
    width: 300px;
    height: auto;
}

.calculate-block .text {
    margin-left: 20px;
}

/* 知识库样式 */
.knowledge-nav {
    float: left;
    width: 20%;
    padding: 20px;
}

.knowledge-nav ul {
    list-style-type: none;
    padding: 0;
}

.knowledge-nav li {
    margin-bottom: 10px;
}

.knowledge-content {
    float: left;
    width: 80%;
    padding: 20px;
}