/**
 * Kehua · 留白 — Gridea Pro 主题样式
 * 移植自 kehuame/whitespace（Typecho），保持视觉 100% 一致并扩展 Gridea Pro 特有页面
 *
 * 章节：
 *  1. CSS 变量（亮 / 暗）
 *  2. 重置 / 基础
 *  3. 容器
 *  4. 顶栏 / 移动端导航
 *  5. 搜索模态
 *  6. 主体 / 列表 / 文章卡片
 *  7. 文章详情
 *  8. 评论
 *  9. 关于 / 友链
 * 10. 归档 / 标签 / 分类
 * 11. 闪念 + 热力图
 * 12. 分页 / 页脚 / 回到顶部 / 404
 * 13. 动画 / 响应式 / 打印
 */

/* =========================================================
   1. CSS 变量
   ========================================================= */

:root {
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-border: #eaeaea;
    --color-border-light: #f0f0f0;
    --color-primary: #e53935;
    --color-primary-hover: #c62828;
    --color-link: #1a1a1a;
    --color-link-hover: var(--color-primary);
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-overlay: rgba(0, 0, 0, 0.5);

    --font-stack-body: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    --header-height: 60px;
    --container-width: 720px;
    --container-wide: 960px;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;
    --radius-max: 9999px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

[data-theme="dark"] {
    --color-bg: #1a1a1a;
    --color-bg-secondary: #242424;
    --color-text: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #707070;
    --color-border: #333333;
    --color-border-light: #2a2a2a;
    --color-link: #e8e8e8;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-overlay: rgba(0, 0, 0, 0.7);
}

/* =========================================================
   2. 重置 / 基础
   ========================================================= */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-stack-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-link-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

kbd {
    display: inline-block;
    padding: 0 6px;
    margin: 0 2px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    line-height: 1.6;
}

/* =========================================================
   3. 容器
   ========================================================= */

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

.container-wide {
    max-width: var(--container-wide);
}

.hor-player {
    width: 100%;
    aspect-ratio: 16 / 9;
}

.ver-player {
    width: 100%;
    aspect-ratio: 16 / 9;
}

.hor-image {
    width: 100%;
    aspect-ratio: 16 / 9;
}

.ver-image {
    width: 100%;
    aspect-ratio: 16 / 9;
}

* =========================================================
   4. 顶栏
   ========================================================= */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
}

.header-inner {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-text);
    flex-shrink: 0;
}

.logo:hover {
    color: var(--color-text);
}

.logo-img {
    height: 32px;
    width: auto;
    display: block;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
    justify-content: center;
    flex-wrap: nowrap;
    overflow-x: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.nav::-webkit-scrollbar {
    display: none;
}

.nav-link {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

.nav-link.active {
    font-weight: 500;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--color-text-secondary);
    border-radius: var(--radius-full);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.btn-icon:hover {
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
}

.icon {
    width: 20px;
    height: 20px;
}

#theme-toggle .icon-moon { display: none; }
[data-theme="dark"] #theme-toggle .icon-sun { display: none; }
[data-theme="dark"] #theme-toggle .icon-moon { display: block; }

.mobile-menu-toggle {
    display: none;
}

/* 移动端导航抽屉 */
.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
    z-index: 99;
    flex-direction: column;
    gap: var(--spacing-xs);
    box-shadow: 0 4px 12px var(--color-shadow);
    transition: background-color var(--transition-normal);
}

.mobile-nav.active {
    display: flex;
}

.mobile-nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
}

/* =========================================================
   5. 搜索模态
   ========================================================= */

.search-modal {
    position: fixed;
    inset: 0;
    background-color: var(--color-overlay);
    z-index: 200;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 100px;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.search-modal.active {
    opacity: 1;
    visibility: visible;
}

.search-modal-content {
    width: 100%;
    max-width: 600px;
    padding: 0 var(--spacing-lg);
    transform: translateY(-20px);
    transition: transform var(--transition-normal);
}

.search-modal.active .search-modal-content {
    transform: translateY(0);
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: 0 8px 32px var(--color-shadow);
}

.search-input-wrapper .icon {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1.125rem;
    background: transparent;
    color: var(--color-text);
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-close {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.search-close:hover {
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
}

.search-results {
    margin-top: var(--spacing-md);
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px var(--color-shadow);
    max-height: 60vh;
    overflow-y: auto;
}

.search-empty {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}

.search-result-item {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-light);
    transition: background-color var(--transition-fast);
    cursor: pointer;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover,
.search-result-item.active {
    background-color: var(--color-bg-secondary);
}

.search-result-title {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.search-result-title mark {
    background: rgba(229, 57, 53, 0.18);
    color: var(--color-primary);
    padding: 0 2px;
    border-radius: 2px;
}

.search-result-meta {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    display: flex;
    gap: var(--spacing-sm);
}

.search-result-excerpt {
    margin-top: 4px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.search-shortcuts {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

/* JS 注入的搜索结果列表（重置 ul 默认样式 + 让 anchor 占满整行） */
.search-result-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.search-result-link {
    display: block;
    color: inherit;
    text-decoration: none;
}

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

/* 搜索 / 移动菜单展开时锁定背景滚动 */
body.search-open,
body.mobile-nav-open {
    overflow: hidden;
}

/* =========================================================
   6. 主体 / 列表 / 文章卡片
   ========================================================= */

.main {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

.home-hero {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--color-text-secondary);
    line-height: 1.9;
    font-size: 1.0625rem;
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.post {
    position: relative;
    padding: var(--spacing-xl);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.post:hover {
    box-shadow: 0 4px 16px var(--color-shadow);
}

.post-featured {
    border: none;
    background: transparent;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
}

.post-featured:hover {
    box-shadow: none;
}

.post-featured .post-title {
    font-size: 1.75rem;
}

.post-pin {
    display: inline-block;
    padding: 2px 8px;
    white-space: nowrap;
    font-size: 0.75rem;
    font-weight: 500;
    color: #fff;
    background-color: var(--color-primary);
    border-radius: var(--radius-sm);
}

.post-with-thumb {
    display: flex;
    gap: var(--spacing-md);
}

.post-thumb {
    flex-shrink: 0;
    width: 224px;
    height: 126px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: var(--color-bg-secondary);
}

.post-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.post:hover .post-thumb img {
    transform: scale(1.05);
}

.post-content {
    flex: 1;
    min-width: 0;
}

.post-title-box {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.post-title {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.post-title a {
    color: var(--color-text);
}

.post-title a:hover {
    color: var(--color-primary);
}

.post-excerpt {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.post-meta-sep {
    color: var(--color-border);
}

.post-category a {
    color: var(--color-text-secondary);
}

.post-category a:hover {
    color: var(--color-primary);
}

.tag-sep {
    color: var(--color-border);
    margin: 0 2px;
}

/* =========================================================
   7. 文章详情
   ========================================================= */

.category-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.category-eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.category-title {
    font-size: 2rem;
    font-weight: 700;
}

.category-desc {
    margin-top: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.article-detail {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.article-header {
    margin-bottom: var(--spacing-xl);
}

.article-title {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

.article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.article-meta-sep { color: var(--color-border); }
.article-category a { color: var(--color-text-muted); }
.article-category a:hover { color: var(--color-primary); }

.article-cover {
    margin-bottom: var(--spacing-xl);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background-color: var(--color-bg-secondary);
}

.article-cover img {
    width: 100%;
}

.article-content {
    font-size: 1rem;
    line-height: 2;
    text-align: justify;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
    font-weight: 600;
    line-height: 1.4;
}

.article-content h2 {
    font-size: 1.5rem;
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
}

.article-content h3 {
    font-size: 1.25rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.article-content h4 {
    font-size: 1.0625rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.article-content p {
    margin-top: var(--spacing-xl);
}

.article-content p:first-child {
    margin-top: 0;
}

.article-content a {
    color: var(--color-primary);
}

.article-content a:hover {
    text-decoration: underline;
}

.article-content ul,
.article-content ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-lg);
}

.article-content li {
    margin-bottom: var(--spacing-sm);
}

.article-content blockquote {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--color-text-secondary);
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content pre {
    position: relative;
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    overflow-x: auto;
    line-height: 1.7;
}

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
}

.article-content p code,
.article-content li code {
    padding: 0.125rem 0.375rem;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
}

.article-content pre code {
    color: var(--color-text);
    background: transparent;
    padding: 0;
}

.article-content img {
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-xl) 0;
    font-size: 0.9375rem;
}

.article-content th,
.article-content td {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    text-align: left;
}

.article-content th {
    background-color: var(--color-bg-secondary);
    font-weight: 600;
}

.article-content hr {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-2xl) 0;
}

/* 代码复制按钮（由 JS 注入） */
.code-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    font-size: 12px;
    color: var(--color-text-muted);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast), color var(--transition-fast);
}

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

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

.code-copy-btn.is-copied {
    color: #2e7d32;
    border-color: #2e7d32;
    opacity: 1;
}

/* 阅读进度条 */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--color-primary);
    z-index: 101;
    transition: width 0.1s linear;
}

/* 文章标签 */
.article-tags {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag-label {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.article-tags .tag,
.tag-cloud .tag-cloud-item .tag-cloud-name {
    display: inline-block;
}

.article-tags a {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.article-tags a:hover {
    color: var(--color-primary);
    background-color: rgba(229, 57, 53, 0.1);
}

/* 上一篇 / 下一篇 */
.article-nav {
    margin-top: var(--spacing-2xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.article-nav-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    overflow: hidden;
}

.article-nav-item:hover {
    background-color: var(--color-border-light);
    color: var(--color-text);
}

.article-nav-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.article-nav-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.04em;
}

.article-nav-title {
    font-size: 0.9375rem;
    color: var(--color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.article-nav-prev { text-align: left; }
.article-nav-next { text-align: right; align-items: flex-end; }

/* =========================================================
   8. 评论
   ========================================================= */

.comments-section {
    max-width: var(--container-width);
    margin: var(--spacing-2xl) auto 0;
    padding: 0 var(--spacing-lg);
}

.comments-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
}

.comments-placeholder {
    padding: var(--spacing-xl);
    background-color: var(--color-bg-secondary);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
}

.comments-placeholder-note {
    margin-top: var(--spacing-md);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    text-align: center;
}

.comment-form-skeleton .comment-textarea {
    width: 100%;
    min-height: 96px;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg);
    color: var(--color-text);
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.comment-form-skeleton .comment-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.comment-form-footer {
    margin-top: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.comment-form-info {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-sm);
}

.comment-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition-fast);
}

.comment-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.comment-form-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

.comment-submit {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-primary);
    color: #fff;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    line-height: 1.5;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.comment-submit:hover {
    background-color: var(--color-primary-hover);
}

.comment-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 实际评论列表（如果第三方评论服务渲染了 .comment 等元素） */
.comments-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.comment {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.comment-avatar {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    overflow: hidden;
    background-color: var(--color-bg-secondary);
}

.comment-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.comment-body { flex: 1; min-width: 0; }

.comment-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.comment-author {
    font-weight: 600;
}

.comment-date {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.comment-content {
    color: var(--color-text-secondary);
}

/* =========================================================
   9. 关于 / 友链
   ========================================================= */

.about-page {
    max-width: var(--container-width);
    margin: 0 auto;
}

.about-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.about-avatar {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    border-radius: var(--radius-full);
    overflow: hidden;
    background-color: var(--color-bg-secondary);
    box-shadow: 0 4px 16px var(--color-shadow);
}

.about-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-name {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.about-bio {
    color: var(--color-text-secondary);
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-lg);
}

.about-social {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.social-link:hover {
    color: var(--color-primary);
    background-color: rgba(229, 57, 53, 0.1);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* 友链 */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-md);
}

.link-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.link-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px var(--color-shadow);
    color: var(--color-text);
}

.link-card-avatar {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    overflow: hidden;
    background-color: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.link-card-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.link-card-initial {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
}

.link-card-body {
    flex: 1;
    min-width: 0;
}

.link-card-name {
    font-weight: 600;
    color: var(--color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.link-card-desc {
    margin-top: 2px;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.links-extra {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

/* =========================================================
   10. 归档 / 标签 / 分类
   ========================================================= */

.archive-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.archive-stat { text-align: center; }

.archive-stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.archive-stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.archive-year {
    margin-bottom: var(--spacing-2xl);
}

.archive-year-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.archive-year-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

.archive-list {
    list-style: none;
    padding: 0;
}

.archive-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.archive-item:last-child { border-bottom: none; }

.archive-date {
    flex-shrink: 0;
    width: 110px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.archive-title {
    flex: 1;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.archive-title a {
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.archive-title a:hover {
    color: var(--color-primary);
}

.archive-category {
    flex-shrink: 0;
    font-size: 0.75rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
}

/* 标签云 */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm) var(--spacing-md);
    justify-content: center;
}

.tag-cloud-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-max);
    transition: color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.tag-cloud-item:hover {
    color: #fff;
    background-color: var(--color-primary);
    transform: translateY(-1px);
}

.tag-cloud-count {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.tag-cloud-item:hover .tag-cloud-count {
    color: rgba(255, 255, 255, 0.85);
}

/* 分类卡片网格 */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.category-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px var(--color-shadow);
    color: var(--color-text);
}

.category-card-name {
    font-size: 1.0625rem;
    font-weight: 600;
}

.category-card-count {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* =========================================================
   11. 闪念 + 热力图
   ========================================================= */

.memo-heatmap-wrap {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow-x: auto;
}

.memo-heatmap-stats {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.memo-heatmap-stats strong {
    color: var(--color-primary);
    font-size: 1.125rem;
}

.memo-heatmap {
    display: grid;
    grid-template-rows: repeat(7, 1fr);
    grid-auto-flow: column;
    grid-auto-columns: 12px;
    gap: 3px;
    min-width: 720px;
}

.memo-heatmap::after {
  content: "";
  grid-column: auto;
  grid-row: 1 / -1; 
  width: var(--spacing-lg);
  min-width: var(--spacing-lg);
}

.memo-heatmap-loading {
    grid-row: 1 / -1;
    grid-column: 1 / -1;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    text-align: center;
    padding: var(--spacing-md);
}

.memo-heatmap-cell {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    background-color: var(--color-border-light);
    transition: transform var(--transition-fast);
}

.memo-heatmap-cell[data-level="1"] { background-color: rgba(229, 57, 53, 0.25); }
.memo-heatmap-cell[data-level="2"] { background-color: rgba(229, 57, 53, 0.45); }
.memo-heatmap-cell[data-level="3"] { background-color: rgba(229, 57, 53, 0.7);  }
.memo-heatmap-cell[data-level="4"] { background-color: var(--color-primary);    }

.memo-heatmap-cell:hover {
    transform: scale(1.4);
}

.memo-heatmap-legend {
    margin-top: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--color-text-muted);
    font-size: 0.8125rem;
    justify-content: flex-end;
}

.memo-heatmap-legend-label {
    margin: 0 4px;
}

/* Memo 时间轴 */
.memo-timeline {
    position: relative;
    padding-left: 32px;
}

.memo-timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background-color: var(--color-border);
}

.memo-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
}

.memo-item a {
    color: var(--color-primary);
}

.memo-item a:hover {
    text-decoration: underline;
}

.memo-item:last-child { margin-bottom: 0; }

.memo-dot {
    position: absolute;
    left: -32px;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: var(--radius-full);
    background-color: var(--color-bg);
    border: 2px solid var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-bg);
}

.memo-body {
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.memo-content {
    color: var(--color-text);
    line-height: 1.85;
    font-size: 0.9375rem;
}

.memo-content p { margin-bottom: var(--spacing-sm); }
.memo-content p:last-child { margin-bottom: 0; }
.memo-content img {
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-sm);
}

.memo-date {
    display: block;
    margin-top: var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* =========================================================
   12. 分页 / 页脚 / 回到顶部 / 404
   ========================================================= */

.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
    list-style: none;
    padding: 0;
}

.pagination-item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--color-text-secondary);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
    flex-shrink: 0;
}

.pagination-item:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.pagination-disabled {
    color: var(--color-text-muted);
    opacity: 0.5;
    pointer-events: none;
}

.pagination-info {
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

.no-results {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-muted);
}

.footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-text {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-info {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
}

.footer-info a {
    color: var(--color-text-muted);
}

.footer-info a:hover { color: var(--color-primary); }

/* 回到顶部 */
.back-to-top {
    position: fixed;
    right: var(--spacing-lg);
    bottom: var(--spacing-lg);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    box-shadow: 0 2px 8px var(--color-shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-normal), border-color var(--transition-fast);
    z-index: 50;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    border-color: var(--color-text-muted);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
    color: var(--color-text-secondary);
}

/* 404 */
.error-page {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.error-code {
    font-size: 8rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--spacing-md);
    text-shadow: 4px 4px 0 var(--color-border);
}

.error-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.error-message {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.error-actions {
    display: flex;
    gap: var(--spacing-md);
}

.error-btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-xl);
    background-color: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

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

.error-btn-secondary {
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

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

/* =========================================================
   13. 动画 / 响应式 / 打印
   ========================================================= */

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.post {
    animation: fadeIn 0.4s ease forwards;
}

.post:nth-child(1) { animation-delay: 0.04s; }
.post:nth-child(2) { animation-delay: 0.08s; }
.post:nth-child(3) { animation-delay: 0.12s; }
.post:nth-child(4) { animation-delay: 0.16s; }
.post:nth-child(5) { animation-delay: 0.20s; }
.post:nth-child(6) { animation-delay: 0.24s; }
.post:nth-child(7) { animation-delay: 0.28s; }
.post:nth-child(8) { animation-delay: 0.32s; }

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }

    .nav { display: none; }
    .mobile-menu-toggle { display: flex; }

    .post-featured .post-title { font-size: 1.5rem; }

    .post-with-thumb { flex-direction: column-reverse; }

    .post-thumb {
        width: 100%;
        height: 0;
        padding-bottom: 56%;
        position: relative;
    }

    .post-thumb img {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
    }

    .article-title { font-size: 1.5rem; }

    .article-nav {
        grid-template-columns: 1fr;
    }

    .article-nav-next {
        text-align: left;
        align-items: flex-start;
    }

    .comment-form-info {
        grid-template-columns: 1fr;
    }

    .about-avatar { width: 100px; height: 100px; }
    .about-name { font-size: 1.5rem; }

    .archive-stats {
        flex-wrap: wrap;
        gap: var(--spacing-lg);
    }

    .archive-item {
        flex-wrap: wrap;
    }

    .archive-date {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }

    .archive-category {
        margin-left: auto;
    }

    .pagination {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (max-width: 480px) {
    .container,
    .header-inner,
    .article-detail,
    .comments-section {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }

    .ver-player {
        width: 100%;
        aspect-ratio: 9 / 16;
    }

    .post {
        padding: var(--spacing-md);
    }

    .post-title { font-size: 1.125rem; }
    .post-excerpt { font-size: 0.875rem; }

    .article-title { font-size: 1.375rem; }

    .pagination-item {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .back-to-top {
        right: var(--spacing-md);
        bottom: var(--spacing-md);
        width: 40px;
        height: 40px;
    }

    .error-code { font-size: 5rem; }
    .error-title { font-size: 1.5rem; }
    .error-actions { flex-direction: column; width: 100%; }
    .error-btn { text-align: center; }

    .categories-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }

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

@media print {
    .header,
    .footer,
    .back-to-top,
    .search-modal,
    .mobile-nav,
    .article-nav,
    .comments-section,
    .pagination,
    .reading-progress {
        display: none !important;
    }

    body {
        color: #000;
        background: #fff;
    }

    .article-content a {
        color: #000;
        text-decoration: underline;
    }

    .article-content a::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }
}