/* ============================================================
   LPLBlog 设计宪法 (DESIGN.md) 实现
   品牌词: 冷混凝土 · 精确 · 极简但有内容 (《镜之边缘》锚点)
   规则: 三灰层次 / 全站紫色唯一强调 / 零圆角零阴影 / hover 只变色
   ============================================================ */

:root {
    /* 60-30-10 颜色（浅化: 保留纸感与硬度，去掉厚重感） */
    --bg-color: #f0f2f4;        /* 混凝土灰基底 · 灵动 */
    --card-bg: #f6f7f9;         /* 卡片/面板 */
    --surface: #fcfdfe;         /* 代码块/正文面 */
    --primary-color: #5b5bd6;   /* 唯一强调色: 深紫罗兰 */
    --primary-hover: #4a4abf;
    --text-primary: #1a1c1f;
    --text-secondary: #5f6368;
    --text-faint: #9aa0a6;
    --border-color: #dfe2e6;
    --dark-ink: #14161a;        /* hero 遮罩/灯箱底 */
    --skeleton: #e8ebee;        /* 图片加载占位（三灰体系第四灰，仅用于未就绪的图框） */

    /* 字体 */
    --font-sans: 'Work Sans', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-mono: 'JetBrains Mono', Consolas, 'Courier New', monospace;

    /* 镜之边缘严格模式: 圆角只允许按钮/输入框 2px */
    --radius-strict: 0;
    --radius-btn: 2px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

/* 页面切换: 关掉 View Transitions（现代浏览器默认 0.5s 太长），
   只留一个极快的淡入给不支持 VT 的浏览器 */
@media (prefers-reduced-motion: no-preference) {
    .main { animation: pageIn .08s ease-out both; }
}

@keyframes pageIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: none; }
}

/* 锚点定位时避开 60px 顶部导航 */
h1[id], h2[id], h3[id], h4[id], h5[id], h6[id],
.year-group, .project-entry, .vlog-card, #featured {
    scroll-margin-top: 72px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-color);
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: clip;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }
.mono { font-family: var(--font-mono); }

::selection { background: var(--primary-color); color: #fff; }

mark.hl {
    background: var(--primary-color);
    color: #fff;
    padding: 0 2px;
    border-radius: 1px;
}
mark.hl.active {
    background: var(--primary-hover);
    box-shadow: 0 0 0 2px rgba(91, 91, 214, 0.4);
    padding: 0 2px;
}

/* 文章详情页搜索导航按钮 */
.article-search-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    font-size: 0.78rem;
    color: var(--text-secondary);
}
.article-search-nav button {
    width: 24px;
    height: 24px;
    border: 1px solid var(--border-color);
    background: var(--surface);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}
.article-search-nav button:hover {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}
.article-search-nav span {
    flex: 1;
    text-align: center;
    min-width: 40px;
}

/* ------------------------------------------------------------
   顶部导航（全站保留，样式升级）
   ------------------------------------------------------------ */
.topnav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    padding: 0 28px;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

/* Logo: 纯紫色 mono 重字，无下划线无装饰 */
.logo {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 0.18em;
    color: var(--primary-color);
}

.topnav-links { display: flex; gap: 4px; margin-left: auto; }

.topnav-links a {
    padding: 6px 14px;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}

.topnav-links a:hover { color: var(--text-primary); }

.topnav-links a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 500;
}

.menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    padding: 6px 10px;
    color: var(--text-primary);
    font-size: 1rem;
}

/* ------------------------------------------------------------
   页面骨架: 内容页 侧栏 + 主区 / 首页单列
   ------------------------------------------------------------ */
.page {
    display: grid;
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 0;
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - 60px - 52px);
    align-items: start;
}

.page-home { grid-template-columns: minmax(0, 1fr); max-width: none; }

.main { padding: 40px 48px 80px; min-width: 0; }

.page-home .main { padding: 0; }

/* ------------------------------------------------------------
   侧栏
   ------------------------------------------------------------ */
.sidebar {
    position: sticky;
    top: 60px;
    padding: 40px 0 40px 28px;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

.sidebar-block { margin-bottom: 32px; padding-right: 24px; }

.sidebar-title {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 12px;
}

.sidebar-list { list-style: none; }

.sidebar-list li a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    margin-left: -10px;
    font-size: 0.92rem;
    color: var(--text-secondary);
    border-left: 2px solid transparent;
    transition: color 0.15s, background-color 0.15s, border-color 0.15s;
}

.sidebar-list li a:hover { color: var(--text-primary); background: var(--card-bg); }

.sidebar-list li a.active {
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    font-weight: 500;
}

.sidebar-list .count {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-faint);
}

.sidebar-search {
    width: 100%;
    padding: 8px 10px;
    font-family: inherit;
    font-size: 0.92rem;
    color: var(--text-primary);
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    outline: none;
    transition: border-color 0.15s;
}

.sidebar-search:focus { border-color: var(--primary-color); }

.sidebar-hint {
    margin-top: 8px;
    font-size: 0.78rem;
    color: var(--text-faint);
}

/* 摄影页布局切换 */
.layout-toggle { display: flex; gap: 6px; }

.layout-btn {
    flex: 1;
    padding: 6px 0;
    font-size: 0.82rem;
    color: var(--text-secondary);
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    transition: color 0.15s, border-color 0.15s, background-color 0.15s;
}

.layout-btn:hover { color: var(--primary-color); border-color: var(--primary-color); }

.layout-btn.active {
    color: #fff;
    background: var(--primary-color);
    border-color: var(--primary-color);
}

/* TOC 大纲: JS 建嵌套树，层级缩进来自嵌套；hover 留足呼吸感（上下 6px 左右 12px） */
.toc-tree, .toc-tree ul { list-style: none; }

.toc-tree ul { padding-left: 13px; }

.toc-list .toc-row { display: flex; align-items: center; }

.toc-list .toc-row a {
    flex: 1;
    min-width: 0;
    padding: 6px 12px;
    border-left: 2px solid transparent;
    transition: color 0.15s, background-color 0.15s, border-color 0.15s;
}

.toc-list .toc-row a:hover { color: var(--text-primary); background: var(--surface); }

.toc-list .toc-level-1 > .toc-row a { font-weight: 600; }
.toc-list .toc-level-2 > .toc-row a { font-weight: 500; }
.toc-list .toc-level-3 > .toc-row a { font-size: 0.88rem; }
.toc-list .toc-level-4 > .toc-row a { font-size: 0.85rem; }
.toc-list .toc-level-5 > .toc-row a { font-size: 0.82rem; }
.toc-list .toc-level-6 > .toc-row a { font-size: 0.8rem; }

.toc-list .toc-row a.active {
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--surface);
}

/* 折叠按钮（幕布式） */
.toc-toggle {
    flex: 0 0 auto;
    background: none;
    border: none;
    padding: 2px 6px;
    color: var(--text-faint);
    font-size: 0.68rem;
    transition: color 0.15s, transform 0.2s;
}

.toc-toggle:hover { color: var(--primary-color); }

.toc-toggle i { transition: transform 0.2s ease; display: inline-block; }

li:not(.collapsed) > .toc-row .toc-toggle i { transform: rotate(90deg); }

.toc-list li.collapsed > ul { display: none; }

.tag-list { display: flex; flex-direction: column; gap: 0; }

/* 标签折叠：超出 6 个默认收起，点按钮展开 */
.tag-list.collapsed .tag-extra { display: none; }

.tag-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    margin-top: 6px;
    padding: 7px 12px 0 0;
    font-family: inherit;
    font-size: 0.78rem;
    color: var(--text-faint);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: color 0.18s ease;
}

.tag-toggle:hover { color: var(--primary-color); }

.tag-toggle i {
    font-size: 0.66rem;
    transition: transform 0.22s ease;
}

.tag-toggle[aria-expanded="true"] i { transform: rotate(180deg); }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }

.tag-chip {
    display: inline-block;
    padding: 2px 10px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    transition: color 0.15s, border-color 0.15s;
}

.tag-chip:hover { color: var(--primary-color); border-color: var(--primary-color); }

/* ------------------------------------------------------------
   首页 hero（电影海报式）
   ------------------------------------------------------------ */
.hero {
    position: relative;
    height: calc(100vh - 60px);
    min-height: 480px;
    background-color: var(--dark-ink);
    overflow: hidden;
}

/* 轮播图层: 纯淡入淡出，克制不花哨 */
.hero-slide {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.hero-slide.active { opacity: 1; }

.hero-fallback { background: linear-gradient(135deg, #d9dce1, #c3c8cf); }

.hero-veil {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(20, 22, 26, 0.62) 0%, rgba(20, 22, 26, 0.12) 40%, rgba(20, 22, 26, 0) 65%);
}

.hero-caption {
    position: absolute;
    left: 48px;
    bottom: 56px;
    color: #fff;
}

.hero-kicker {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.3em;
    opacity: 0.85;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.4rem);
    font-weight: 700;
    line-height: 1.15;
    margin: 10px 0 8px;
}

.hero-sub {
    font-size: 0.95rem;
    opacity: 0.85;
}

/* 首页自我介绍: 悬浮纸面板（图片之上），排版减重 */
.home-panel {
    position: absolute;
    right: 48px;
    top: 50%;
    transform: translateY(-50%);
    width: min(400px, 34vw);
    max-height: 76vh;
    overflow-y: auto;
    padding: 30px 30px 26px;
    background: rgba(252, 253, 254, 0.88);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* 减重: 常规字重 + 宽松行距，不再堆加粗 */
.home-intro {
    font-size: 0.92rem;
    line-height: 1.9;
    font-weight: 400;
    color: var(--text-primary);
}

.home-intro h2 { font-size: 1.12rem; font-weight: 600; margin: 0 0 8px; }

.home-intro h3 {
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    margin: 18px 0 4px;
}

.home-intro p { margin: 8px 0; }

.home-intro ul { margin: 6px 0; padding-left: 18px; }

.home-intro li { margin: 3px 0; }

.home-intro strong { font-weight: 500; }

.home-intro > *:first-child { margin-top: 0; }

/* 首页单屏: 无下滑 */
body.home-body .site-footer { display: none; }

.home-nav-blocks {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    border-top: 1px solid var(--border-color);
    border-left: 1px solid var(--border-color);
}

.home-block {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 24px 20px;
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.15s;
}

.home-block:hover { background: var(--card-bg); }

.home-block-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--primary-color);
}

.home-block-name { font-size: 1.1rem; font-weight: 600; }

.home-block-desc { font-size: 0.85rem; color: var(--text-secondary); }

/* 联系方式: 收进右侧介绍栏底部，与灰底左侧小字形成平衡锚点 */
.home-panel-social {
    display: flex;
    gap: 20px;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
}

.home-panel-social a { transition: color 0.15s; }

.home-panel-social a:hover { color: var(--primary-color); }

.home-panel-social .contact-hint {
    letter-spacing: 0.06em;
    opacity: 0.78;
}

/* ------------------------------------------------------------
   内容页公共头
   ------------------------------------------------------------ */
.page-head { margin-bottom: 32px; }

.page-head h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.page-head-sub {
    margin-top: 4px;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.empty-hint {
    padding: 40px 0;
    color: var(--text-faint);
    text-align: center;
}

/* 整页空态：数据为空时的友好提示 */
.page-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 84px 0 92px;
    text-align: center;
}

.page-empty-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    margin-bottom: 22px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    background: var(--surface);
    color: var(--text-faint);
    font-size: 1.05rem;
}

.page-empty-title {
    margin-bottom: 10px;
    font-size: 1.08rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.03em;
}

.page-empty-desc {
    max-width: 30em;
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-faint);
}

.page-empty-link {
    margin-top: 24px;
    padding-bottom: 2px;
    font-size: 0.86rem;
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.18s ease;
}

.page-empty-link:hover { border-bottom-color: var(--primary-color); }

/* ------------------------------------------------------------
   博客列表: 扁文字卡片
   ------------------------------------------------------------ */
.article-list { display: flex; flex-direction: column; }

.article-row {
    display: block;
    padding: 18px 14px;
    margin: 0 -14px;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.15s;
}

.article-row:hover { background: var(--card-bg); }

.article-row-title { font-size: 1.08rem; font-weight: 600; margin-bottom: 4px; }

.article-row:hover .article-row-title { color: var(--primary-color); }

.article-row-summary {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-row-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px 16px;
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-faint);
}

/* 必带 flex-wrap: 标签多了要换行。一旦它在窄屏撑出横向溢出，
   移动端 Chrome 会把布局视口撑宽，position: fixed 的悬浮按钮
   就会按被撑宽的视口定位，直接跑到屏幕外（表现为「按钮贴在
   HTML 底部而不是屏幕上」）。 */
.article-row-tags { display: inline-flex; flex-wrap: wrap; gap: 6px; min-width: 0; }

/* ------------------------------------------------------------
   摄影页: 精选横滑条 + 年分组 + 瀑布流/田字格
   ------------------------------------------------------------ */
.featured-strip { margin-bottom: 56px; }

.featured-stage {
    position: relative;
    aspect-ratio: 21 / 9;
    background: var(--dark-ink);
    overflow: hidden;
}

.featured-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background-color: var(--dark-ink);
    opacity: 0;
    transition: opacity 0.35s ease;
}

.featured-img.active { opacity: 1; }

.featured-caption {
    position: absolute;
    left: 20px;
    bottom: 16px;
    display: flex;
    flex-direction: column;
    color: #fff;
    pointer-events: none;
}

.featured-title { font-size: 1.05rem; font-weight: 600; }

.featured-exif {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    opacity: 0.85;
}

.featured-thumbs {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.featured-thumb {
    flex: 0 0 auto;
    width: 120px;
    aspect-ratio: 16 / 9;
    padding: 0;
    border: 1px solid var(--border-color);
    background: var(--skeleton);
    opacity: 0.65;
    transition: opacity 0.15s, border-color 0.15s;
}

.featured-thumb img { width: 100%; height: 100%; object-fit: cover; }

.featured-thumb.active { opacity: 1; border-color: var(--primary-color); }

.year-group { margin-bottom: 48px; }

.year-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.year-count {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 400;
    color: var(--text-faint);
    margin-left: 8px;
}

/* 大 / 中 / 小 三档布局（CSS columns 瀑布流） */
.photo-layout.cols-2 { columns: 2; column-gap: 16px; }
.photo-layout.cols-3 { columns: 3; column-gap: 16px; }
.photo-layout.cols-4 { columns: 4; column-gap: 16px; }

.photo-item {
    break-inside: avoid;
    margin: 0 0 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    cursor: zoom-in;
    transition: background-color 0.15s;
}

.photo-item:hover { background: var(--surface); }

/* 图片未就绪时以 --skeleton 色块撑住版面，杜绝「坍缩 → 膨胀」的跳动。
   width/height 属性让浏览器提前算出宽高比，占位尺寸与成品一致。 */
.photo-item img {
    display: block;
    width: 100%;
    height: auto;
    background-color: var(--skeleton);
}

.photo-item img.ph-ready { animation: photoFadeIn 0.32s ease both; }

@keyframes photoFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.photo-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 10px 12px;
}

.photo-name { font-size: 0.92rem; font-weight: 500; }

.photo-exif {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-secondary);
}

.photo-meta { font-size: 0.75rem; color: var(--text-faint); }

/* 灯箱: 淡入淡出 + 图片轻微缩放入场；上图下信息 */
.lightbox {
    display: flex;
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(20, 22, 26, 0.94);
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.16s ease, visibility 0.16s;
}

.lightbox.active { opacity: 1; visibility: visible; }

.lightbox-stage {
    max-width: 88vw;
    display: flex;
    flex-direction: column;
}

/* 画布：给图片一个稳定的显示区，切换时不跳动 */
.lightbox-canvas {
    position: relative;
    display: grid;
    place-items: center;
    min-width: 34vw;
    min-height: 46vh;
    background-color: rgba(255, 255, 255, 0.03);
}

.lightbox-stage img {
    grid-area: 1 / 1;
    max-width: 100%;
    max-height: 78vh;
    object-fit: contain;
    cursor: zoom-out;
    background-color: rgba(255, 255, 255, 0.03);
}

/* 加载态：盖住上一张 + 转圈，替换掉「顿几秒还留着旧图」的观感 */
.lightbox-loader {
    grid-area: 1 / 1;
    align-self: stretch;
    justify-self: stretch;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(20, 22, 26, 0.92);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.18s ease, visibility 0.18s;
}

.lightbox.loading .lightbox-loader { opacity: 1; visibility: visible; }

.lightbox-loader::after {
    content: '';
    width: 26px;
    height: 26px;
    border: 2px solid rgba(255, 255, 255, 0.18);
    border-top-color: #b9b9f0;
    border-radius: 50%;
    animation: lightboxSpin 0.72s linear infinite;
}

@keyframes lightboxSpin { to { transform: rotate(360deg); } }

.lightbox-stage img.swap { animation: lightboxImgIn 0.2s ease; }

@keyframes lightboxImgIn {
    from { opacity: 0; transform: scale(0.985); }
    to { opacity: 1; transform: none; }
}

.lightbox-info {
    margin-top: 14px;
    display: flex;
    flex-direction: column;
    gap: 7px;
    color: #fff;
}

.lightbox-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 24px;
}

.lightbox-title { font-size: 1.02rem; font-weight: 600; }

.lightbox-row-sub { font-size: 0.78rem; opacity: 0.75; }

.lightbox-download {
    color: #fff;
    font-size: 0.78rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
    transition: color 0.15s, border-color 0.15s;
    white-space: nowrap;
}

.lightbox-download:hover { color: #b9b9f0; border-color: #b9b9f0; }

/* 灯箱底部操作区：高清预览 + 免费下载 */
.lightbox-actions {
    display: inline-flex;
    align-items: baseline;
    gap: 18px;
    white-space: nowrap;
}

/* 「高清预览」按钮：复用 .lightbox-download 的视觉，这里只补 button 默认样式重置 */
.lightbox-hd-btn {
    background: none;
    border: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
    padding: 0;
    cursor: pointer;
    font-family: inherit;
    line-height: inherit;
}
.lightbox-hd-btn.active { color: #b9b9f0; border-color: #b9b9f0; }

.lightbox-desc {
    font-size: 0.86rem;
    line-height: 1.75;
    opacity: 0.85;
    white-space: pre-wrap;
}

.lightbox-desc.clamped {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.lightbox-desc-btn {
    align-self: flex-start;
    padding: 0;
    background: none;
    border: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.76rem;
    transition: color 0.15s;
}

.lightbox-desc-btn:hover { color: #fff; }

.lightbox-copyright {
    position: absolute;
    bottom: 12px;
    left: 24px;
    right: 24px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.42);
    pointer-events: none;
}

.lightbox-close {
    position: absolute;
    top: 16px;
    right: 24px;
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    line-height: 1;
}

.lightbox-nav {
    background: none;
    border: none;
    color: #fff;
    font-size: 3rem;
    padding: 24px;
    opacity: 0.7;
    transition: opacity 0.15s;
}

.lightbox-nav:hover { opacity: 1; }

/* ------------------------------------------------------------
   文章详情页
   ------------------------------------------------------------ */
.article-page { max-width: 820px; }

.article-head { margin-bottom: 32px; padding-bottom: 20px; border-bottom: 1px solid var(--border-color); }

.article-head.has-bg {
    padding: 56px 32px;
    background-size: cover;
    background-position: center;
    color: #fff;
    border-bottom: none;
}

.article-head h1 { font-size: 2rem; line-height: 1.25; margin-bottom: 10px; }

.article-head-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.article-head.has-bg .article-head-meta { color: rgba(255, 255, 255, 0.85); }

.article-actions {
    display: flex;
    gap: 12px;
    margin: 40px 0 32px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    transition: color 0.15s, border-color 0.15s;
}

.action-btn:hover { color: var(--primary-color); border-color: var(--primary-color); }

.action-btn.liked { color: var(--primary-color); border-color: var(--primary-color); }

/* 上一篇 / 下一篇: 去盒子化。只留一条发丝分隔线，hover 仅标题变色，灵动不突兀 */
.adjacent-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin: 0 0 48px;
    padding-top: 18px;
    border-top: 1px solid var(--border-color);
}

.adjacent-link {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.adjacent-link.right { text-align: right; align-items: flex-end; }

.adjacent-label {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.06em;
    color: var(--text-faint);
}

.adjacent-title {
    font-size: 0.94rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.15s;
}

.adjacent-link:hover .adjacent-title { color: var(--primary-color); }

.comment-section h3, .comment-section h4 { margin-bottom: 16px; }

.comment-item {
    padding: 14px 16px;
    margin-bottom: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.comment-head {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
}

.comment-author { font-weight: 600; font-size: 0.92rem; }

.comment-time { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-faint); }

.comment-content { font-size: 0.92rem; white-space: pre-wrap; }

.comment-form { display: flex; flex-direction: column; gap: 10px; max-width: 560px; }

.comment-form input,
.comment-form textarea {
    padding: 10px 12px;
    font-family: inherit;
    font-size: 0.92rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    outline: none;
    transition: border-color 0.15s;
}

.comment-form input:focus,
.comment-form textarea:focus { border-color: var(--primary-color); }

/* 评论框提示语: 标准灰(#9aa0a6)，点进去（聚焦）就让位，
   不必等到开始打字才消失。opacity:1 是给火狐的，
   它默认会在 placeholder 颜色上再叠一层透明度。 */
.comment-form input::placeholder,
.comment-form textarea::placeholder {
    color: var(--text-faint);
    opacity: 1;
}

.comment-form input:focus::placeholder,
.comment-form textarea:focus::placeholder { color: transparent; }

.btn-primary {
    align-self: flex-start;
    padding: 9px 24px;
    font-size: 0.9rem;
    color: #fff;
    background: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: var(--radius-btn);
    transition: background-color 0.15s, border-color 0.15s;
}

.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }

/* ------------------------------------------------------------
   编程页: 项目旁附介绍
   ------------------------------------------------------------ */
.project-list { display: flex; flex-direction: column; gap: 40px; }

.project-entry {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 28px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

.project-entry-cover {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border: 1px solid var(--border-color);
}

.project-entry-name { font-size: 1.3rem; font-weight: 700; margin-bottom: 12px; }

.project-entry-desc { font-size: 0.94rem; color: var(--text-secondary); margin-bottom: 16px; }

.project-entry-links { display: flex; gap: 10px; }

.link-btn {
    padding: 7px 18px;
    font-size: 0.86rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    transition: color 0.15s, border-color 0.15s;
}

.link-btn:hover { color: var(--primary-color); border-color: var(--primary-color); }

.link-btn.solid {
    color: #fff;
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.link-btn.solid:hover { background: var(--primary-hover); }

/* ------------------------------------------------------------
   Vlog 页
   ------------------------------------------------------------ */
/* Vlog: 田字卡片网格，封面在上详情在下，信息密度高 */
.vlog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.vlog-card {
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.vlog-card .vlog-player-mount { border: none; border-bottom: 1px solid var(--border-color); }

.vlog-card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 14px 18px 16px;
}

.vlog-card-title { font-size: 1.02rem; font-weight: 600; line-height: 1.4; }

.vlog-card-desc {
    flex: 1;
    font-size: 0.86rem;
    line-height: 1.7;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.vlog-card-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    font-size: 0.75rem;
    color: var(--text-faint);
}

.vlog-card-meta a { color: var(--primary-color); }

.vlog-player-mount {
    position: relative;
    padding: 0;
    border: 1px solid var(--border-color);
    background: var(--dark-ink);
}

.vlog-cover { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }

.vlog-play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: rgba(20, 22, 26, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    transition: background-color 0.15s;
}

.vlog-player-mount:hover .vlog-play-icon { background: var(--primary-color); }

.vlog-player-mount .vlog-iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ---------- 移动端悬浮搜索: FAB + 底部抽屉（搜索框绝不定在顶部） ---------- */
.search-fab { display: none; }

.search-drawer-backdrop { display: none; }

/* ------------------------------------------------------------
   Markdown 正文排版
   ------------------------------------------------------------ */
.article-body { font-size: 1.02rem; line-height: 1.85; }

/* H1-H6 紫点标记体系: 点随层级斜向错位 + 文字逐级缩进，层级一眼可辨 */
.article-body h1, .article-body h2, .article-body h3,
.article-body h4, .article-body h5, .article-body h6 {
    position: relative;
    font-weight: 700;
    line-height: 1.4;
}

.article-body h1::before, .article-body h2::before, .article-body h3::before,
.article-body h4::before, .article-body h5::before, .article-body h6::before {
    content: '';
    position: absolute;
    top: 0.58em;
    transform: translateY(-50%);
    border-radius: 50%;
    background: var(--primary-color);
}

.article-body h1 { font-size: 1.6rem; margin: 40px 0 16px; padding-left: 26px; }
.article-body h1::before { left: 0; width: 9px; height: 9px; }

.article-body h2 {
    font-size: 1.35rem;
    margin: 36px 0 14px;
    padding-left: 30px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}
.article-body h2::before { left: 10px; width: 7px; height: 7px; }

.article-body h3 { font-size: 1.12rem; margin: 28px 0 12px; padding-left: 34px; }
.article-body h3::before { left: 20px; width: 6px; height: 6px; opacity: 0.85; }

.article-body h4 { font-size: 1.02rem; margin: 24px 0 10px; padding-left: 40px; }
.article-body h4::before { left: 28px; width: 5px; height: 5px; opacity: 0.65; }

.article-body h5 { font-size: 0.96rem; margin: 22px 0 10px; padding-left: 44px; }
.article-body h5::before { left: 34px; width: 4px; height: 4px; opacity: 0.55; }

.article-body h6 {
    font-size: 0.9rem;
    margin: 20px 0 8px;
    padding-left: 48px;
    color: var(--text-secondary);
}
.article-body h6::before { left: 38px; width: 3px; height: 3px; opacity: 0.5; }

/* 正文内联超链接: 主题紫 + 下划线，一眼可知可点
   （排除 [download]，那是描边按钮，不适用下划线） */
.article-body a:not([download]) {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color 0.15s;
}

.article-body a:not([download]):hover { color: var(--primary-hover); }

/* 附件下载链接: 主题紫描边按钮 + 下载图标，一眼可知可点（点击弹出下载） */
.article-body a[download] {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    margin: 2px 4px 2px 0;
    padding: 4px 14px;
    font-family: var(--font-mono);
    font-size: 0.86em;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: var(--radius-btn);
    transition: color 0.15s, background-color 0.15s, border-color 0.15s;
}

.article-body a[download]::before {
    content: '\f019';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.82em;
}

.article-body a[download]:hover {
    color: #fff;
    background: var(--primary-color);
    border-color: var(--primary-hover);
}

/* TOC 点击跳转: 目标标题一次轻微的紫色呼吸，不生硬 */
.article-body .toc-jump { animation: tocJump 0.3s ease; }

@keyframes tocJump {
    0% { background-color: rgba(91, 91, 214, 0.12); }
    100% { background-color: transparent; }
}

/* 列表页搜索命中: 文章行脉冲呼吸 */
.article-row.row-jump { animation: rowJump 0.3s ease; }

@keyframes rowJump {
    0% { box-shadow: 0 0 0 2px var(--primary-color); background: rgba(91, 91, 214, 0.08); }
    100% { box-shadow: none; background: transparent; }
}

.article-body p { margin: 12px 0; }

.article-body ul, .article-body ol { margin: 12px 0; padding-left: 26px; }

.article-body blockquote {
    margin: 16px 0;
    padding: 8px 18px;
    border-left: 3px solid var(--primary-color);
    background: var(--card-bg);
    color: var(--text-secondary);
}

.article-body img { margin: 16px auto; border: 1px solid var(--border-color); }

.article-body table {
    width: 100%;
    margin: 16px 0;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.article-body th, .article-body td {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.article-body th { background: var(--card-bg); font-weight: 600; }

.article-body :not(pre) > code {
    font-family: var(--font-mono);
    font-size: 0.86em;
    padding: 2px 6px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.article-body pre {
    position: relative;
    margin: 16px 0;
    padding: 16px;
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--border-color);
}

.article-body pre code {
    font-family: var(--font-mono);
    font-size: 0.86rem;
    line-height: 1.6;
}

.article-body hr { margin: 28px 0; border: 0; border-top: 1px solid var(--border-color); }

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    opacity: 0;
    transition: opacity 0.15s, color 0.15s, border-color 0.15s;
}

pre:hover .copy-btn { opacity: 1; }

.copy-btn:hover { color: var(--primary-color); border-color: var(--primary-color); }

/* codehilite 语法高亮（克制配色: 灰阶 + 紫色关键字） */
.codehilite { background: var(--surface); }
.codehilite .k, .codehilite .kn, .codehilite .ow { color: var(--primary-color); font-weight: 500; }
.codehilite .s, .codehilite .s1, .codehilite .s2, .codehilite .sd { color: #3d7a4e; }
.codehilite .c, .codehilite .c1, .codehilite .cm { color: var(--text-faint); font-style: italic; }
.codehilite .nf { color: var(--text-primary); font-weight: 600; }
.codehilite .mi, .codehilite .mf { color: #a04b4b; }

/* ------------------------------------------------------------
   页脚
   ------------------------------------------------------------ */
.site-footer {
    padding: 20px 32px;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-faint);
    text-align: center;
}

/* ------------------------------------------------------------
   后台管理
   ------------------------------------------------------------ */
body.admin-page { background: var(--bg-color); }

/* 后台顶栏: 与前台 topnav 同构 — logo 左，前台首页/退出右，永远一行 */
.admin-topnav {
    position: sticky;
    top: 0;
    z-index: 160;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    padding: 0 28px;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.admin-navlinks { display: flex; gap: 4px; }

.admin-navlinks a {
    padding: 6px 14px;
    font-size: 0.92rem;
    color: var(--text-secondary);
    transition: color 0.15s;
}

.admin-navlinks a:hover { color: var(--text-primary); }

/* 管理菜单 FAB: 桌面隐藏（侧栏常驻），手机端与前台搜索 FAB 同一交互语言 */
.admin-fab { display: none; }

.admin-layout {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    max-width: 1400px;
    margin: 0 auto;
    align-items: start;
}

.admin-sidebar {
    position: sticky;
    top: 60px;
    padding: 24px 0;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

.admin-sidebar h3 {
    padding: 0 20px 12px;
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.admin-sidebar ul { list-style: none; }

.admin-sidebar li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 20px;
    font-size: 0.92rem;
    color: var(--text-secondary);
    border-left: 2px solid transparent;
    transition: color 0.15s, background-color 0.15s, border-color 0.15s;
}

.admin-sidebar li a:hover { color: var(--text-primary); background: var(--card-bg); }

.admin-sidebar li a.active {
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    background: var(--card-bg);
    font-weight: 500;
}

.admin-main { padding: 28px 32px 64px; min-width: 0; }

.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.admin-header h2 { font-size: 1.4rem; }

.admin-card {
    padding: 24px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.save-ok { margin-bottom: 16px; color: var(--primary-color); font-size: 0.9rem; }

.form-hint { margin-top: 6px; font-size: 0.8rem; color: var(--text-faint); }

.checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.92rem;
    color: var(--text-primary);
    cursor: pointer;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    padding: 18px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.stat-number { font-size: 1.6rem; font-weight: 700; font-family: var(--font-mono); }

.stat-label { margin-top: 4px; font-size: 0.82rem; color: var(--text-secondary); }

.card {
    padding: 20px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

/* 访问趋势图: 固定高度绘图区 + 纵坐标刻度 + 网格线，柱体不穿模 */
.chart { display: flex; gap: 12px; }

.chart-yaxis {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: flex-end;
    height: 220px;
    padding-bottom: 22px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-faint);
}

.chart-plot {
    flex: 1;
    min-width: 0;
    height: 220px;
    display: flex;
    background-image: linear-gradient(to top, var(--border-color) 1px, transparent 1px);
    background-size: 100% 25%;
}

.chart-col { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.chart-bar-zone {
    flex: 1;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.chart-bar {
    width: 46%;
    max-width: 42px;
    min-height: 2px;
    position: relative;
    background: var(--primary-color);
    transition: background-color 0.15s;
}

.chart-bar-value {
    position: absolute;
    top: -18px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.chart-bar-label {
    height: 22px;
    line-height: 22px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-faint);
    white-space: nowrap;
    overflow: hidden;
}

.table-container { overflow-x: auto; background: var(--card-bg); border: 1px solid var(--border-color); }

.data-table, .admin-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }

.data-table th, .data-table td, .admin-table th, .admin-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    background: var(--bg-color);
    white-space: nowrap;
}

.data-table tr:last-child td { border-bottom: none; }

/* ---- 后台 admin-table 缩略图 ---- */
.admin-table img {
    max-height: 60px;
    max-width: 100px;
    width: auto;
    height: auto;
    object-fit: cover;
    border-radius: 4px;
    display: block;
}

/* ---- 后台 admin-btn ---- */
.admin-actions { display: flex; gap: 6px; }
.admin-btn {
    padding: 4px 12px;
    font-size: 0.78rem;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}
.admin-btn:hover { border-color: var(--primary-color); color: var(--primary-color); }
.admin-btn.edit:hover { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }
.admin-btn.delete:hover { background: #e53e3e; color: #fff; border-color: #e53e3e; }

.table-actions { display: flex; gap: 8px; }

.btn {
    padding: 8px 18px;
    font-size: 0.88rem;
    border-radius: var(--radius-btn);
    border: 1px solid transparent;
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.btn-primary { color: #fff; background: var(--primary-color); border-color: var(--primary-color); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }

.btn-secondary { color: var(--text-secondary); background: transparent; border-color: var(--border-color); }
.btn-secondary:hover { color: var(--primary-color); border-color: var(--primary-color); }

.btn-danger { color: #a04b4b; background: transparent; border-color: var(--border-color); }
.btn-danger:hover { color: #fff; background: #a04b4b; border-color: #a04b4b; }

/* 模态框（后台） */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 300;
    background: rgba(20, 22, 26, 0.5);
    align-items: flex-start;
    justify-content: center;
    overflow-y: auto;
    padding: 40px 16px;
}

.modal-overlay.active { display: flex; }

.modal-content {
    width: 100%;
    max-width: 720px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 { font-size: 1.05rem; }

.close-btn {
    background: none;
    border: none;
    font-size: 1.6rem;
    line-height: 1;
    color: var(--text-secondary);
    transition: color 0.15s;
}

.close-btn:hover { color: var(--text-primary); }

.modal-body { padding: 24px; max-height: 70vh; overflow-y: auto; }

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.86rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="email"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 9px 12px;
    font-family: inherit;
    font-size: 0.92rem;
    color: var(--text-primary);
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    outline: none;
    transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus { border-color: var(--primary-color); }

/* 后台模态框: 背板压暗 + 1px 边框面板，零圆角零阴影 */
.admin-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 400;
    padding: 40px 16px;
    background: rgba(20, 22, 26, 0.45);
    overflow-y: auto;
}

.admin-modal.active { display: flex; align-items: flex-start; justify-content: center; }

.admin-modal-box {
    width: 100%;
    max-width: 780px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.admin-modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
}

.admin-modal-title { font-weight: 600; letter-spacing: 0.04em; }

.admin-modal-close {
    padding: 4px 8px;
    font-size: 1rem;
    color: var(--text-secondary);
    background: none;
    border: none;
}

.admin-modal-close:hover { color: var(--primary-color); }

.admin-modal-body {
    max-height: calc(100vh - 160px);
    padding: 20px;
    overflow-y: auto;
}

/* Markdown 编辑器: 工具栏 + 编辑区 + 实时预览 */
.markdown-editor { border: 1px solid var(--border-color); background: var(--surface); }

.md-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    padding: 6px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.md-toolbar button {
    min-width: 30px;
    height: 28px;
    padding: 0 9px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-secondary);
    background: none;
    border: 1px solid transparent;
    border-radius: var(--radius-btn);
    transition: color 0.12s, border-color 0.12s;
}

.md-toolbar button:hover { color: var(--primary-color); border-color: var(--primary-color); }

.md-toolbar .md-sep {
    width: 1px;
    height: 20px;
    margin: 4px 5px;
    background: var(--border-color);
}

.markdown-editor textarea {
    width: 100%;
    min-height: 300px;
    padding: 14px;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--surface);
    border: none;
    outline: none;
    resize: vertical;
}

.markdown-preview {
    max-height: 340px;
    padding: 14px;
    font-size: 0.92rem;
    border-top: 1px dashed var(--border-color);
    overflow-y: auto;
}

.markdown-preview:empty::before {
    content: '实时预览';
    font-size: 0.8rem;
    color: var(--text-faint);
}

/* 封面/附件上传区 */
.file-upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 8px;
    padding: 22px;
    color: var(--text-faint);
    border: 1px dashed var(--border-color);
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
}

.file-upload-area:hover { border-color: var(--primary-color); color: var(--primary-color); }

.file-upload-area img { max-height: 120px; margin-top: 10px; }

.md-upload-status { margin-top: 6px; font-size: 0.78rem; color: var(--text-faint); }

.upload-drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 28px;
    color: var(--text-faint);
    border: 1px dashed var(--border-color);
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
}

.upload-drop-zone:hover,
.drop-zone-active { border-color: var(--primary-color); color: var(--primary-color); }

.editor-container { border: 1px solid var(--border-color); }

.md-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.md-toolbar button {
    min-width: 32px;
    padding: 5px 8px;
    font-size: 0.82rem;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-btn);
    transition: color 0.15s, border-color 0.15s;
}

.md-toolbar button:hover { color: var(--primary-color); border-color: var(--primary-color); }

.editor-container textarea {
    display: block;
    width: 100%;
    padding: 14px;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--surface);
    border: none;
    outline: none;
    resize: vertical;
}

.editor-preview {
    padding: 14px;
    border-top: 1px solid var(--border-color);
    background: var(--surface);
    font-size: 0.92rem;
    max-height: 320px;
    overflow-y: auto;
}

/* 后台登录 */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 60px);
    padding: 40px 16px;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 32px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.login-card h1 { font-size: 1.3rem; margin-bottom: 24px; }

.login-form { padding: 40px 0; }

.error-message, .login-error {
    margin-bottom: 16px;
    padding: 10px 14px;
    font-size: 0.88rem;
    color: #a04b4b;
    background: #f3e3e3;
    border: 1px solid #dcb8b8;
}

.success-message {
    margin-bottom: 16px;
    padding: 10px 14px;
    font-size: 0.88rem;
    color: #3d7a4e;
    background: #e2efe6;
    border: 1px solid #bcd6c5;
}

.sidebar-overlay { display: none; }

/* ------------------------------------------------------------
   A4 打印样式（Ctrl+P 只保留正文）
   ------------------------------------------------------------ */
@media print {
    body { background: #fff; }

    .topnav, .sidebar, .site-footer, .article-actions,
    .adjacent-nav, .comment-section, .copy-btn, .menu-toggle { display: none !important; }

    .page { display: block; max-width: none; }

    .main { padding: 0; }

    .article-page { max-width: 186mm; margin: 0 auto; }

    .article-head { border-bottom: 1px solid #999; }

    .article-head.has-bg {
        background: none !important;
        color: #000;
        padding: 0 0 16px;
    }

    .article-body { font-size: 12pt; line-height: 1.7; }

    .article-body pre, .article-body blockquote, .article-body table {
        border: 1px solid #999;
        background: #fff;
        break-inside: avoid;
    }
}

/* ------------------------------------------------------------
   响应式（完整适配）
   769-960px: 保持电脑版双栏骨架（侧栏常驻），仅收紧照片列数；
   移动端交互（汉堡菜单/FAB/抽屉）统一收敛到 ≤768px
   ------------------------------------------------------------ */
@media (max-width: 960px) {
    .photo-layout.cols-3, .photo-layout.cols-4 { columns: 2; }
}

@media (max-width: 768px) {
    /* 横向溢出保险丝: 移动端 Chrome 一旦发现内容比视口宽，会悄悄把布局视口
       撑大，position: fixed 的元素就按被撑大的视口定位 → 悬浮按钮跑出屏幕。
       用 clip 而非 hidden: clip 不生成滚动容器，不破坏 position: sticky。 */
    html, body { overflow-x: clip; }

    .page { grid-template-columns: minmax(0, 1fr); }

    /* 侧栏整体移到内容下方（大纲不再压在正文上面），纵向自然堆叠 */
    .sidebar {
        order: 2;
        position: static;
        max-height: none;
        display: block;
        padding: 0 24px 24px;
        margin-top: 36px;
        border-right: none;
        border-top: 1px solid var(--border-color);
        overflow-x: visible;
    }

    .main { order: 1; }

    .sidebar-block { min-width: 0; padding-right: 0; margin-bottom: 28px; }

    /* 搜索块: 底部固定的小型输入条（贴住屏幕最下沿），随屏浮动
       (JS 已将其搬到 body 下，避免侧栏 drained 隐藏连带，故不带 .sidebar 前缀) */
    .sidebar-search-block {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 290;
        min-width: 0;
        margin-bottom: 0;
        padding: 12px 18px calc(12px + env(safe-area-inset-bottom));
        background: var(--bg-color);
        border-top: 1px solid var(--border-color);
        transform: translateY(110%);
        transition: transform 0.18s ease;
    }

    .sidebar-search-block.open { transform: none; }

    .sidebar-search-block .sidebar-title { display: none; }

    .sidebar-search-block .sidebar-hint { margin-top: 6px; font-size: 0.7rem; }

    .sidebar-search-block .sidebar-search { height: 40px; }

    /* 侧栏块已被搬进目录抽屉后，原侧栏整体退场 */
    .sidebar.sidebar-drained { display: none; }

    /* 目录抽屉: 与搜索同一交互语言 — 底部弹出，可滚动，装大纲/标签/年份等 */
    .contents-drawer {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 290;
        max-height: 72vh;
        overflow-y: auto;
        padding: 16px 20px calc(16px + env(safe-area-inset-bottom));
        background: var(--bg-color);
        border-top: 1px solid var(--border-color);
        transform: translateY(110%);
        transition: transform 0.18s ease;
    }

    .contents-drawer.open { transform: none; }

    .contents-drawer-title {
        margin-bottom: 10px;
        font-family: var(--font-mono);
        font-size: 0.72rem;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--text-faint);
    }

    /* 目录 FAB: 与搜索按钮同样式同尺寸，叠在其上方；无搜索按钮的页面独占底部位置 */
    .toc-fab {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        right: 16px;
        bottom: calc(16px + env(safe-area-inset-bottom));
        z-index: 300;
        width: 46px;
        height: 46px;
        color: #fff;
        background: var(--primary-color);
        border: none;
        border-radius: var(--radius-btn);
        font-size: 0.9rem;
        transition: background-color 0.15s;
    }

    .search-fab ~ .toc-fab { bottom: calc(72px + env(safe-area-inset-bottom)); }

    .toc-fab:hover { background: var(--primary-hover); }

    /* 悬浮搜索按钮: 永远浮在所有层之上，贴屏幕右缘 */
    .search-fab {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        right: 16px;
        bottom: calc(16px + env(safe-area-inset-bottom));
        z-index: 300;
        width: 46px;
        height: 46px;
        color: #fff;
        background: var(--primary-color);
        border: none;
        border-radius: var(--radius-btn);
        font-size: 1rem;
        box-shadow: none;
        transition: background-color 0.15s;
    }

    .search-fab:hover { background: var(--primary-hover); }

    /* 灯箱打开时: 悬浮按钮让位。按钮 z-index 300 高于灯箱 200，
       不藏就会浮在照片和关闭按钮上。用类而不是降 z-index，
       避免和抽屉(290)的层级关系打架。 */
    body.lb-open .search-fab,
    body.lb-open .toc-fab { display: none; }

    .search-drawer-backdrop.show {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 280;
        background: rgba(20, 22, 26, 0.4);
    }

    .main { padding: 28px 24px 64px; }

    /* 首页移动端: 单屏纸面 — 图片铺满一屏，标题悬于上缘，介绍改为底部悬浮玻璃卡，不换页 */
    .hero { height: calc(100svh - 60px); min-height: 480px; }

    .hero-caption {
        position: absolute;
        left: 20px;
        right: 20px;
        top: 20px;
        bottom: auto;
        padding: 0;
    }

    .home-panel {
        position: absolute;
        left: 14px;
        right: 14px;
        top: auto;
        bottom: calc(14px + env(safe-area-inset-bottom));
        transform: none;
        width: auto;
        max-height: 50vh;
        overflow-y: auto;
        padding: 18px 18px 14px;
        background: rgba(20, 22, 26, 0.55);
        border: 1px solid rgba(255, 255, 255, 0.14);
        color: #fff;
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
    }

    /* 深色玻璃上的介绍排版: 全部反白 */
    .home-intro { color: rgba(255, 255, 255, 0.92); }

    .home-intro h2 { color: #fff; }

    .home-intro h3 { color: rgba(255, 255, 255, 0.68); }

    .home-intro a { color: #b9b9f0; }

    .home-panel-social {
        border-top-color: rgba(255, 255, 255, 0.18);
        color: rgba(255, 255, 255, 0.72);
    }

    .home-panel-social a { color: rgba(255, 255, 255, 0.88); }

    .home-panel-social a:hover { color: #b9b9f0; }

    /* 移动端三档仍有区分: 大=1列, 中/小=2列 */
    .photo-layout.cols-2 { columns: 1; }

    .photo-layout.cols-3, .photo-layout.cols-4 { columns: 2; column-gap: 10px; }

    .vlog-grid { grid-template-columns: 1fr; }

    .project-entry { grid-template-columns: 1fr; }

    .adjacent-nav { grid-template-columns: 1fr; gap: 24px; }

    .adjacent-link.right { align-items: flex-start; text-align: left; }

    .admin-layout { grid-template-columns: minmax(0, 1fr); }

    /* 后台手机版: 顶栏保持一行（logo 左 / 前台首页·退出 右），菜单收进 FAB 抽屉 */
    .admin-topnav { padding: 0 16px; }

    .admin-navlinks a { padding: 6px 10px; font-size: 0.9rem; }

    .admin-fab {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        right: 16px;
        bottom: calc(16px + env(safe-area-inset-bottom));
        z-index: 300;
        width: 46px;
        height: 46px;
        color: #fff;
        background: var(--primary-color);
        border: none;
        border-radius: var(--radius-btn);
        font-size: 1rem;
        transition: background-color 0.15s;
    }

    .admin-fab:hover { background: var(--primary-hover); }

    .admin-sidebar {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        bottom: 0;
        width: 220px;
        background: var(--bg-color);
        border-right: 1px solid var(--border-color);
        z-index: 150;
    }

    .admin-sidebar.active { display: block; }

    .sidebar-overlay.active {
        display: block;
        position: fixed;
        inset: 0;
        top: 60px;
        background: rgba(20, 22, 26, 0.4);
        z-index: 140;
    }

    .admin-main { padding: 20px 16px 48px; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 导航栏坍缩断点: 实测 logo(43px) + 5 个链接(313px) + 左右内边距(56px) ≈ 412px，
   留 28px 余量 → 441px 起保持横排，≤440px 才折叠为汉堡抽屉（有空间就不坍缩） */
@media (max-width: 440px) {
    .topnav { padding: 0 16px; }

    .topnav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--bg-color);
        border-bottom: 1px solid var(--border-color);
    }

    .topnav-links.open { display: flex; }

    .topnav-links a { padding: 12px 24px; border-bottom: none; border-left: 2px solid transparent; }

    .topnav-links a.active { border-left-color: var(--primary-color); border-bottom: none; }

    .menu-toggle { display: block; }
}