.nav-item {
    font-weight: 700;
}

/* 当前页面导航项持续高亮 */
.nav-item.selected {
    background-color: #f0f0f0;
    border-top-color: #b0b0b0;
}

/* 首页区块标题间距 */
.recent-posts h2 {
    margin-top: 1.8em;
}

/* 首页头像 */
.home-profile {
    text-align: center;
    padding: 2rem 0 1rem;
}

.home-avatar {
    max-width: 100%;
    height: auto;
    display: inline-block;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,.1);
}

/* ── Naval 两栏布局 ─────────────────────────── */

/* 扩展 Naval 页内容区宽度 */
.naval-wide.content {
    max-width: 900px;
    width: 95%;
}

/* 两栏容器 */
.naval-layout {
    display: flex;
    gap: 2.5rem;
    align-items: flex-start;
}

/* 左侧边栏 */
.naval-sidebar-wrap {
    width: 210px;
    flex-shrink: 0;
    position: sticky;
    top: 2rem;
    max-height: calc(100vh - 5rem);
    overflow-y: auto;
    border-right: 1px solid #e8e8e8;
    padding-right: 1.2rem;
}

/* 右侧主内容 */
.naval-main {
    flex: 1;
    min-width: 0;
}

/* 侧边栏导航 */
.naval-nav {
    font-size: 0.88em;
}

.naval-nav-root {
    display: block;
    font-weight: 700;
    font-size: 1em;
    padding: 0.4em 0.5em;
    margin-bottom: 0.6em;
    color: #222;
    text-decoration: none;
    letter-spacing: 0.02em;
}

.naval-nav-root:hover,
.naval-nav-root.active {
    color: #000;
}

/* 递归树 */
.naval-tree {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.naval-tree .naval-tree {
    padding-left: 0.8em;
    border-left: 1px solid #e0e0e0;
    margin: 0.2em 0 0.2em 0.4em;
}

.naval-tree li {
    margin: 0.15em 0;
}

.naval-tree a {
    display: block;
    padding: 0.28em 0.5em;
    border-radius: 4px;
    color: #555;
    text-decoration: none;
    line-height: 1.4;
    transition: background 0.15s, color 0.15s;
}

.naval-tree a:hover {
    background: #f5f5f5;
    color: #222;
}

.naval-tree a.active {
    background: #efefef;
    color: #000;
    font-weight: 600;
}

/* 含子项的 section 标题 */
.naval-tree li.has-sub > a {
    font-weight: 600;
    color: #333;
}

/* section list 页面 */
.naval-section-title {
    font-size: 1.5em;
    margin-bottom: 0.5em;
}

.naval-section-desc {
    color: #666;
    margin-bottom: 1.5em;
    font-size: 0.95em;
}

.naval-page-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-bottom: 2rem;
}

.naval-page-item {
    display: block;
    padding: 0.7em 1em;
    border: 1px solid #e8e8e8;
    border-radius: 6px;
    text-decoration: none;
    color: #222;
    transition: border-color 0.15s, background 0.15s;
}

.naval-page-item:hover {
    border-color: #b0b0b0;
    background: #fafafa;
}

.naval-page-title {
    display: block;
    font-weight: 600;
}

.naval-page-desc {
    display: block;
    font-size: 0.85em;
    color: #888;
    margin-top: 0.2em;
}

.naval-subsection {
    margin-bottom: 1.5rem;
}

.naval-subsection-title {
    display: block;
    font-weight: 700;
    font-size: 1.05em;
    margin-bottom: 0.4em;
    color: #222;
    text-decoration: none;
}

.naval-subsection-pages {
    list-style: none;
    padding-left: 1em;
    border-left: 2px solid #e8e8e8;
}

.naval-subsection-pages li a {
    color: #555;
    text-decoration: none;
    display: block;
    padding: 0.25em 0;
}

.naval-subsection-pages li a:hover {
    color: #000;
}

/* 文章页 */
.naval-article-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e8e8e8;
}

.naval-article-header h1 {
    margin: 0 0 0.4em;
}

.naval-article-desc {
    color: #777;
    font-size: 0.95em;
    margin: 0;
}

/* 移动端：上下堆叠 */
@media (max-width: 768px) {
    .naval-wide.content {
        width: 92%;
    }

    .naval-layout {
        flex-direction: column;
    }

    .naval-sidebar-wrap {
        width: 100%;
        position: static;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid #e8e8e8;
        padding-right: 0;
        padding-bottom: 1rem;
        margin-bottom: 1.5rem;
    }
}

/* 文章封面图 */
.post-cover {
    width: 100%;
    margin-bottom: 1.5rem;
    border-radius: 10px;
    overflow: hidden;
}

.post-cover img {
    width: 100%;
    max-height: 420px;
    object-fit: cover;
    display: block;
}