/* 固定导航栏高度 */
.topnav.navbar {
    height: 67px !important;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

/* 调整导航栏内容垂直居中 */
.topnav.navbar .navbar-brand,
.topnav.navbar .navbar-nav,
.topnav.navbar .navbar-collapse {
    display: flex;
    align-items: center;
}

/* 调整导航栏logo大小 */
.topnav.navbar .navbar-brand img {
    height: 45px;
    width: auto;
    margin: 5px;
    transition: transform 0.3s ease;
}

.topnav.navbar .navbar-brand:hover img {
    transform: scale(1.03);
}

/* 导航菜单项美化 */
.topnav.navbar .nav-link {
    color: #2c3e50 !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    position: relative;
    transition: color 0.3s ease;
}

.topnav.navbar .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: #ffda58;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.topnav.navbar .nav-link:hover::after {
    width: 70%;
}

.topnav.navbar .nav-item.active .nav-link::after,
.topnav.navbar .nav-item .nav-link.active::after {
    width: 70%;
}

/* 搜索框美化 */
.topnav.navbar .form-control {
    border-radius: 20px 0 0 20px;
    border-right: none;
    transition: all 0.3s ease;
}

.topnav.navbar .input-group-append button {
    border-radius: 0 20px 20px 0;
    border-left: none;
}

.topnav.navbar .form-control:focus {
    box-shadow: none;
    border-color: #ffda58;
}

.topnav.navbar .form-control:focus + .input-group-append button {
    border-color: #ffda58;
}

/* 调整目录导航的定位问题 */
.toc-item a {
    display: block;
    padding: 0.25rem 0;
    text-decoration: none;
    color: #4a5568;
    transition: all 0.2s ease;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 修复目录点击后的定位问题 */
.article-content h2,
.article-content h3,
.article-content h4 {
    scroll-margin-top: 80px; /* 导航栏高度 + 一些额外空间 */
}

/* 内容区域顶部添加足够的间距 */
.container.pt-4 {
    padding-top: 2rem !important;
}

/* 显示所有标题的目录导航 */
.toc-h3, .toc-h4 {
    display: block;
}

/* 调整目录侧边栏的位置 */
.sticky-top {
    top: 80px !important; /* 导航栏高度 + 一些额外空间 */
}

/* 调整小标题的缩进和样式 */
.toc-h3 {
    padding-left: 1rem;
    font-size: 0.85rem;
}

.toc-h4 {
    padding-left: 2rem;
    font-size: 0.8rem;
}

/* 移除文章首字放大功能 */
article:first-letter {
    font-size: inherit !important;
    font-weight: normal !important;
    float: none !important;
    margin: 0 !important;
    padding: 0 !important;
    line-height: inherit !important;
}

/* 高亮发布文章按钮 */
.topnav.navbar .nav-item.highlight .nav-link {
    background-color: #ffda58;
    color: #2c3e50 !important;
    border-radius: 20px;
    padding: 0.5rem 1.2rem !important;
    font-weight: 600;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.topnav.navbar .nav-item.highlight .nav-link:hover {
    background-color: #ffd033;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.topnav.navbar .nav-item.highlight .nav-link::after {
    display: none;
}