body {
    font-family: "Aptos", "Simsun", 宋体, serif;
    margin: 0;
    padding: 0;
    color: #333;
    display: flex;
    flex-direction: center;
    align-items: flex-start; /* 改为flex-start避免居中布局的跳动 */
    min-height: 100vh;
    position: relative; /* 让子元素可以绝对定位 */
    z-index: 1;
    overflow-x: hidden; /* 防止横向滚动条 */
}

body::before {
    content: "";
    position: fixed; /* 改为fixed确保背景图固定 */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("../images/background_2025.jpg");
    background-size: cover;
    background-position: center center;
    background-attachment: fixed; /* 固定背景附着 */
    opacity: 0.4;
    z-index: -1;
}

/* 移动设备背景优化 */
@media screen and (max-width: 768px) {
    body::before {
        background-attachment: scroll; /* 移动设备使用scroll以提升性能 */
        background-position: center top;
    }
}

.navbar {
    background: #2c3e50;
    padding: 1rem 0;
    position: sticky;
    top: 0;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #3498db;
}

.container {
    width: 1000px;
    background-color: rgba(255, 255, 255, 0.75);
    padding: 25px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
    min-height: 90vh;
    border-radius: 10px;
    margin: 20px auto; /* 添加上下边距，避免紧贴顶部 */
    display: flex;
    gap: 20px;
    transition: height 0.6s cubic-bezier(0.4, 0, 0.2, 1); /* 添加平滑高度过渡 */
    position: relative;
}

/* 左侧个人信息区域 */
.sidebar-section {
    flex: 0 0 280px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 头像容器 */
.avatar-container {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.avatar-container:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.avatar-image {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #f0f0f0;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

.avatar-image:hover {
    transform: scale(1.05);
}

.avatar-info h3 {
    margin: 10px 0 5px 0;
    color: #333;
    font-size: 20px;
    font-family: "Simsun", serif;
}

.avatar-info p {
    margin: 0;
    color: #666;
    font-size: 14px;
    font-style: italic;
}

/* 信息容器 */
.info-container, .contact-container {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.info-container:hover, .contact-container:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.info-container h3, .contact-container h3 {
    margin: 0 0 15px 0;
    color: #333;
    font-size: 18px;
    font-family: "Simsun", serif;
    border-bottom: 2px solid #87CEEB;
    padding-bottom: 8px;
}

.info-content p {
    margin: 0;
    font-size: 16px;
    color: #666;
    line-height: 1.6;
}

.contact-content p {
    margin: 0 0 15px 0;
    font-size: 14px;
    color: #666;
    line-height: 1.6;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background-color: rgba(135, 206, 235, 0.1);
    border-radius: 8px;
    color: #2e6061;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
}

.contact-link:hover {
    background-color: rgba(135, 206, 235, 0.2);
    color: #5fc3c5;
    transform: translateX(5px);
}

.email-icon {
    font-size: 16px;
}

/* 右侧内容区域 */
.content-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0; /* 防止flex item溢出 */
}

.articles-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e0e0e0;
}

.articles-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

header {
    background-color: #ffffff;
    color: rgb(10, 10, 10);
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: left;
    height: 60px;
}

.header-text {
    flex: 0.8;
    font-family: "Simsun", serif;
}

.header-img {
    width: 250px;
    height: 60px;
    border-radius: 0%;
    overflow: hidden;
}

.header-img img {
    width: 100%;
    height: auto;
}

nav {
    display: flex;
}

.nav-button, .toggle-button {
    font-size: 16px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    border-radius: 5px;
    padding: 8px 15px;
    background-color: #ffffff;
    color: #2e6061;
    border: 2px solid #2e6061;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-button:hover, .toggle-button:hover {
    background-color: #f4f9f4;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

footer {
    background-color: #f9f7f7;
    color: rgb(34, 33, 33);
    text-align: right;
    padding: 3px;
    font-size: 14px;
    border-radius: 8px;
}

h2 {
    border-bottom: 2px solid #6f6f6f;
    padding-bottom: 5px;
    margin-bottom: 20px;
    font-size: 28px;
}

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

ul li {
    margin-bottom: 10px;
}

a {
    color: #2e6061;
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: #5fc3c5;;
}

p {
    font-size: 20px;
}

/* 展开文章区域的样式 */
.additional-articles {
    margin-top: 0;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.6s ease-in-out,
                opacity 0.4s ease-in-out,
                margin 0.4s ease-in-out;
}

.additional-articles.expanded {
    max-height: 2000px;
    opacity: 1;
    margin-top: 20px;
}

/* 简化的卡片展开动画 */
.additional-articles.expanded .blog-card {
    opacity: 1;
}

/* 按钮居中样式 */
.toggle-button {
    display: block;
    margin: 20px auto;
}

/* 响应式设计 - 平板和手机端适配 */
@media screen and (max-width: 768px) {
    /* 容器响应式调整 */
    .container {
        width: 95%;
        max-width: 100%;
        min-height: auto;
        padding: 15px;
        flex-direction: column; /* 改为上下布局 */
        gap: 20px;
        margin: 10px auto;
    }

    /* 侧边栏区域响应式 */
    .sidebar-section {
        flex: none;
        width: 100%;
        flex-direction: row; /* 在手机上个人信息区域横向排列 */
        flex-wrap: wrap;
        gap: 15px;
        justify-content: space-between;
    }

    /* 头像容器缩小 */
    .avatar-container {
        flex: 0 0 auto;
        padding: 15px;
        min-width: 120px;
        text-align: center;
    }

    .avatar-image {
        width: 80px;
        height: 80px;
        margin-bottom: 10px;
    }

    .avatar-info h3 {
        font-size: 18px;
        margin: 5px 0 3px 0;
    }

    .avatar-info p {
        font-size: 12px;
    }

    /* 信息容器响应式 */
    .info-container, .contact-container {
        flex: 1;
        min-width: 200px;
        padding: 15px;
    }

    .info-container h3, .contact-container h3 {
        font-size: 16px;
        margin-bottom: 10px;
        padding-bottom: 5px;
    }

    .info-content p {
        font-size: 14px;
    }

    .contact-content p {
        font-size: 12px;
        margin-bottom: 10px;
    }

    .contact-link {
        font-size: 12px;
        padding: 6px 10px;
    }

    /* 内容区域响应式 */
    .content-section {
        flex: 1;
        width: 100%;
    }

    /* 文章头部响应式 */
    .articles-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        margin-bottom: 15px;
        padding-bottom: 10px;
    }

    .articles-header h2 {
        font-size: 24px;
        margin-bottom: 5px;
    }

    /* 文章网格响应式 */
    .articles-grid {
        grid-template-columns: 1fr; /* 单列布局 */
        gap: 15px;
    }

    /* 博客卡片响应式 */
    .blog-card {
        margin-bottom: 0;
    }

    .blog-card-content {
        flex-direction: column;
        height: auto;
    }

    .blog-card-image {
        height: 150px;
    }

    .blog-card-text h3 {
        font-size: 16px;
        margin-bottom: 5px;
    }

    .blog-card-text p {
        font-size: 13px;
        line-height: 1.4;
    }

    /* 按钮响应式 */
    .toggle-button {
        font-size: 14px;
        padding: 10px 20px;
        margin: 15px auto;
    }

    /* 段落字体大小 */
    p {
        font-size: 16px;
    }

    /* 页眉响应式 */
    header {
        padding: 10px;
        height: auto;
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 10px;
    }

    .header-text {
        font-size: 18px;
    }

    .header-img {
        height: 40px;
        width: 200px;
    }
}

/* 更小屏幕设备（小于480px）进一步优化 */
@media screen and (max-width: 480px) {
    .container {
        width: 98%;
        padding: 10px;
        margin: 5px auto;
        gap: 15px;
    }

    .sidebar-section {
        flex-direction: column; /* 在极小屏幕上改为纵向排列 */
        gap: 10px;
    }

    .avatar-container {
        width: 100%;
        padding: 10px;
    }

    .info-container, .contact-container {
        width: 100%;
        padding: 12px;
        min-width: auto;
    }

    .avatar-image {
        width: 70px;
        height: 70px;
    }

    .avatar-info h3 {
        font-size: 16px;
    }

    .avatar-info p {
        font-size: 11px;
    }

    .info-container h3, .contact-container h3 {
        font-size: 14px;
    }

    .info-content p {
        font-size: 13px;
    }

    .contact-content p {
        font-size: 11px;
    }

    .contact-link {
        font-size: 11px;
        padding: 5px 8px;
    }

    .articles-header h2 {
        font-size: 20px;
    }

    .blog-card-text h3 {
        font-size: 14px;
    }

    .blog-card-text p {
        font-size: 12px;
    }

    .blog-card-image {
        height: 120px;
    }

    .toggle-button {
        font-size: 12px;
        padding: 8px 16px;
    }

    p {
        font-size: 14px;
    }

    .header-text {
        font-size: 16px;
    }

    .header-img {
        height: 30px;
        width: 150px;
    }
}