/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: SimSun, serif;
    font-size: 16px;
    line-height: 25px;
    letter-spacing: 2px;
    background-color: #f5f5f5;
}

/* 容器样式 */
.container {
    width: 1000px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
}

/* 头部样式 */
header {
    text-align: center;
    padding: 30px 0;
    border-bottom: 2px solid #eee;
}

header h1 {
    font-size: 36px;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 18px;
    color: #666;
    margin-bottom: 20px;
}

/* 导航样式 */
nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 30px;
}

nav a {
    text-decoration: none;
    color: #333;
    padding: 5px 15px;
    transition: color 0.3s;
}

nav a:hover {
    color: #1e88e5;
}

/* 主要内容样式 */
main {
    padding: 30px 0;
}

section {
    margin-bottom: 40px;
}

h2, h3 {
    margin-bottom: 20px;
    color: #333;
}

img {
    max-width: 100%;
    height: auto;
    margin: 10px 0;
    display: block;
}

/* 预览区域样式 */
.preview {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.preview-item {
    text-align: center;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 8px;
}

/* 引言框样式 */
.quote-box {
    background-color: #f0f7ff;
    padding: 15px;
    border-left: 4px solid #1e88e5;
    margin: 15px 0;
}

.key-points {
    list-style: none;
    padding-left: 20px;
}

.key-points li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
}

.key-points li:before {
    content: "•";
    color: #1e88e5;
    position: absolute;
    left: 0;
    font-size: 20px;
}

/* 最新研究部分样式 */
.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 20px;
}

.research-item {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.research-item:hover {
    transform: translateY(-5px);
}

.research-item h4 {
    color: #1e88e5;
    margin: 10px 0;
}

/* 应用部分样式 */
.application-content {
    display: flex;
    align-items: center;
    gap: 30px;
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
}

.application-content img {
    width: 40%;
}

.application-text {
    flex: 1;
}

.application-text ul {
    list-style: none;
    padding-left: 0;
}

.application-text li {
    margin: 10px 0;
    padding-left: 20px;
    position: relative;
}

.application-text li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: #1e88e5;
}

/* 页脚样式增强 */
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

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

.footer-nav a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-nav a:hover {
    color: #1e88e5;
}

.footer-quote {
    font-style: italic;
    color: #888;
}

.copyright {
    border-top: 1px solid #eee;
    padding-top: 20px;
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 20px 0;
    border-top: 2px solid #eee;
    color: #666;
}

/* 页面介绍样式 */
.page-intro {
    margin-bottom: 40px;
}

.intro-content {
    display: flex;
    gap: 30px;
    align-items: start;
}

.intro-content img {
    width: 45%;
    border-radius: 8px;
}

.intro-text {
    flex: 1;
}

/* 认知过程网格样式 */
.process-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 20px;
}

.process-item {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.process-item:hover {
    transform: translateY(-5px);
}

.process-item h4 {
    color: #1e88e5;
    margin: 15px 0 10px;
}

/* 研究方法样式 */
.method-content {
    display: flex;
    align-items: center;
    gap: 30px;
    background-color: #f9f9f9;
    padding: 25px;
    border-radius: 8px;
    margin-top: 20px;
}

.method-content img {
    width: 40%;
    border-radius: 8px;
}

.method-text {
    flex: 1;
}

.method-text ul {
    list-style: none;
    padding-left: 0;
    margin-top: 15px;
}

.method-text li {
    margin: 10px 0;
    padding-left: 20px;
    position: relative;
}

.method-text li:before {
    content: "•";
    color: #1e88e5;
    position: absolute;
    left: 0;
}

/* 应用网格样式 */
.application-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 20px;
}

.application-item {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
}

.application-item img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 15px;
}

.application-item h4 {
    color: #1e88e5;
    margin-bottom: 10px;
}

/* 当前页面导航高亮 */
nav a.active {
    color: #1e88e5;
    border-bottom: 2px solid #1e88e5;
}