/* ==========================================================================
   DEEPWHITE 全局样式表
   --------------------------------------------------------------------------
   本文件主要负责站点外观与布局结构：
       1. 设计系统（CSS 变量）
       2. 全局排版 / 基础布局（container、链接、头部 / 尾部）
       3. 分页组件
       4. 首页列表、文章页 / 通用页面内容
       5. 代码高亮与 Markdown 提示框
       6. 图片系统
       7. 浮动按钮 / 目录导航（TOC）
       8. 脚注预览与 404 页面
       9. 响应式断点（>1200px / <600px）
   ========================================================================== */

/* --- 1. 设计系统：CSS 变量 --- */
:root {
    --color-background: #ffffff;
    --color-text: #333333;
    --color-text-strong: #000000;
    --color-text-subtle: #555555;
    --color-meta: #888888;
    --color-border: #eeeeee;
    --color-link-underline: #bbbbbb;
    --color-code-bg: #f7f7f7;
    --font-family-sans-latin: "Inter", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    --font-family-sans-cjk: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "WenQuanYi Zen Hei", sans-serif;
    --font-family-sans: var(--font-family-sans-latin), var(--font-family-sans-cjk);
    --font-family-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    --line-height-latin: 1.7;
    --line-height-zh: 1.65;
    --letter-spacing-latin: 0.015em;
    --letter-spacing-zh: 0.01em;
    --measure-reading: 68ch;
    --container-width: 760px;
}

/* --- 2. 全局与排版重置 --- */
html {
    scroll-behavior: smooth;
    text-size-adjust: 100%;
}
body {
    font-family: var(--font-family-sans);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: var(--line-height-latin);
    letter-spacing: var(--letter-spacing-latin);
    margin: 0;
    padding: 0;
    font-kerning: normal;
    font-feature-settings: "kern" 1, "liga" 1;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    text-wrap: pretty;
    hanging-punctuation: allow-end;
    word-break: break-word;
    scrollbar-gutter: stable both-edges;
}

html:lang(zh) body,
html:lang(zh-CN) body,
html:lang(zh-Hans) body {
    line-height: var(--line-height-zh);
    letter-spacing: var(--letter-spacing-zh);
    font-family: var(--font-family-sans-cjk);
}

html:lang(en) body,
html:lang(en-US) body,
html:lang(en-GB) body {
    line-height: var(--line-height-latin);
    letter-spacing: var(--letter-spacing-latin);
    font-family: var(--font-family-sans-latin);
}

/* --- 3. 核心布局容器 --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 40px 20px;
}

/* --- 4. 链接与交互样式 --- */
a {
    color: var(--color-text);
    text-decoration: none;
    border-bottom: 1px solid var(--color-link-underline);
    transition: color 0.2s, border-color 0.2s;
}
a:hover {
    color: var(--color-text-strong);
    border-bottom-color: var(--color-text-strong);
}
a:focus-visible {
    outline: 2px solid var(--color-text-subtle);
    outline-offset: 2px;
}

/* --- 5. 通用组件：头部、尾部 --- */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 50px;
}
.site-branding {
    display: inline-flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}
.site-title {
    font-size: 26px;
    font-weight: 400;
    margin: 0;
    letter-spacing: 0.05em;
    text-transform: lowercase;
    font-variant-numeric: oldstyle-nums;
}
.site-title-uppercase {
    text-transform: uppercase;
}
.site-title a {
    color: var(--color-text-strong);
    border-bottom: none;
    transition: color 0.3s ease, letter-spacing 0.3s ease;
    display: inline-block;
    position: relative;
}
.site-title a:hover {
    color: var(--color-text);
    letter-spacing: 0.08em;
}
.site-title a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-text);
    transition: width 0.3s ease;
}
.site-title a:hover::after {
    width: 100%;
}
.site-nav a {
    margin-left: 20px;
    color: var(--color-text-subtle);
    font-size: 16px;
    border-bottom: none;
}
.site-nav a:hover,
.site-nav a:focus-visible {
    color: var(--color-text-strong);
    outline: none;
}
.site-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}
.site-footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--color-border);
    color: #999999;
    font-size: 14px;
}
.site-footer a {
    color: #777777;
    border-bottom-color: #cccccc;
}

/* --- 6. 分页导航 --- */
.pagination-nav {
    margin: 50px 0 20px;
    display: flex;
    justify-content: center;
    text-align: center;
}

.pagination-links {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
    transition: background 0.2s ease, box-shadow 0.2s ease, backdrop-filter 0.2s ease;
}

.pagination-nav:hover .pagination-links,
.pagination-nav:focus-within .pagination-links {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 18px 45px rgba(15, 15, 15, 0.08);
    backdrop-filter: blur(6px);
}

.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    border-bottom: none;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.85em;
    font-weight: 500;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.pagination-nav:hover .pagination-link:hover,
.pagination-link:focus-visible {
    color: var(--color-text-strong);
    border-color: var(--color-border);
    background-color: var(--color-code-bg);
    transform: translateY(-1px);
    outline: none;
}

.pagination-link.is-disabled {
    opacity: 0.45;
    color: var(--color-meta);
    cursor: not-allowed;
    pointer-events: none;
}

.pagination-status {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75em;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-subtle);
    cursor: pointer;
    border-radius: 16px;
    padding: 8px 18px;
    transition: color 0.2s ease, background-color 0.2s ease;
    text-align: center;
}

.pagination-status:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

.pagination-status-text {
    pointer-events: none;
}

.pagination-quickjump {
    position: absolute;
    left: 50%;
    bottom: calc(100% + 12px);
    transform: translateX(-50%) translateY(8px);
    min-width: 220px;
    max-width: 280px;
    padding: 16px;
    border-radius: 18px;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    box-shadow: 0 20px 50px rgba(15, 15, 15, 0.12);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 5;
}

.pagination-quickjump::after,
.pagination-quickjump::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
}

.pagination-quickjump::after {
    bottom: -13px;
    border-width: 13px 15px 0 15px;
    border-style: solid;
    border-color: var(--color-border) transparent transparent transparent;
    z-index: 0;
}

.pagination-quickjump::before {
    bottom: -12px;
    border-width: 12px 14px 0 14px;
    border-style: solid;
    border-color: var(--color-background) transparent transparent transparent;
    z-index: 1;
}

.pagination-status:hover .pagination-quickjump,
.pagination-status:focus-within .pagination-quickjump,
.pagination-status.is-open .pagination-quickjump {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* --- 6.1 分页导航：移动端优化 --- */
@media (max-width: 640px) {
    .pagination-nav {
        margin-top: 32px;
        margin-bottom: 16px;
    }

    .pagination-links {
        flex-wrap: nowrap;
        flex-direction: column;
        align-items: stretch;
        row-gap: 8px;
        padding: 10px 14px;
        border-radius: 14px;
    }

    .pagination-link {
        width: 100%;
        justify-content: center;
        padding: 8px 10px;
        font-size: 0.85em;
        letter-spacing: 0.06em;
    }

    .pagination-status {
        order: -1;
        padding: 4px 4px 8px;
        font-size: 0.8em;
    }

    .pagination-quickjump {
        min-width: 180px;
        max-width: calc(100vw - 40px);
    }
}

.pagination-quickjump-header {
    font-size: 0.7em;
    letter-spacing: 0.2em;
    color: var(--color-text-subtle);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.pagination-numbers {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.pagination-number {
    min-width: 32px;
    height: 32px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85em;
    color: var(--color-text);
    border: 1px solid transparent;
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.pagination-number:hover,
.pagination-number:focus-visible {
    border-color: var(--color-border);
    background-color: var(--color-code-bg);
    outline: none;
}

.pagination-number.current {
    color: var(--color-background);
    background-color: var(--color-text-strong);
    border-color: var(--color-text-strong);
    cursor: default;
}

.archive-pagination .pagination-links {
    --archive-capsule-spacing: 14px;
    padding: var(--archive-capsule-spacing);
    gap: calc(var(--archive-capsule-spacing) + 4px);
}

@media (max-width: 600px) {
    .pagination-links {
        flex-direction: column;
        border-radius: 20px;
        padding: 16px;
    }

    .pagination-link {
        width: 100%;
        justify-content: center;
        font-size: 0.85em;
    }

    .pagination-status {
        letter-spacing: 0.08em;
    }
}

/* --- 7. 首页：文章列表 --- */
.post-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.post-item {
    margin-bottom: 38px;
}
.post-title {
    font-size: 24px;
    font-weight: 500;
    margin-top: 0;
    margin-bottom: 6px;
}
.post-title a {
    color: var(--color-text);
    border-bottom: none;
}
.post-title a:hover {
    border-bottom: 1px solid var(--color-text);
}
.post-meta {
    font-size: 13px;
    color: var(--color-meta);
    margin-bottom: 6px;
    margin-top: -2px;
    opacity: 0.7;
    line-height: 1.4;
}
.post-excerpt {
    font-size: 16px;
    margin-bottom: 12px;
    line-height: 1.6;
}
.read-more {
    display: inline-block;
    margin-top: 15px;
    font-size: 0.9em;
    color: #111111;
    text-decoration: none;
    border: 1px solid var(--color-text);
    padding: 8px 15px;
    transition: background-color 0.3s ease, color 0.3s ease;
}
.read-more:hover {
    background-color: var(--color-text-strong);
    color: var(--color-background);
    border-color: var(--color-text-strong);
}

/* --- 7. 文章页与通用页面样式 --- */
.post-full-header, .page-header {
    text-align: center;
    margin-bottom: 50px;
}
.post-full-title, .page-title {
    font-size: 40px;
    font-weight: 600;
    color: var(--color-text-strong);
    margin-top: 0;
    margin-bottom: 15px;
    line-height: 1.3;
}
.post-full-meta {
    font-size: 14px;
    color: var(--color-meta);
}
.post-content, .page-content {
    font-size: 18px;
    line-height: var(--line-height-zh);
    letter-spacing: inherit;
    max-width: var(--measure-reading);
    margin: 0 auto;
    color: var(--color-text);
    text-wrap: pretty;
    hanging-punctuation: allow-end;
}
.post-content > *:first-child,
.page-content > *:first-child {
    margin-top: 0;
}
.post-content p,
.page-content p {
    margin: 1.1em 0;
}
.post-content :lang(en),
.page-content :lang(en) {
    letter-spacing: var(--letter-spacing-latin);
}
.post-content :lang(zh),
.page-content :lang(zh) {
    letter-spacing: var(--letter-spacing-zh);
}
.post-content h2, .page-content h2,
.post-content h3, .page-content h3,
.post-content h4, .page-content h4 {
    color: var(--color-text-strong);
    margin-top: 2.4em;
    margin-bottom: 1.1em;
    border: none;
    padding-bottom: 0.4em;
    position: relative;
    letter-spacing: 0.02em;
    text-decoration-line: underline;
    text-decoration-thickness: 0.14em;
    text-underline-offset: 0.5em;
    text-decoration-color: var(--color-border);
    text-decoration-skip-ink: auto;
}
.post-content h2, .page-content h2 { font-size: 1.55em; }
.post-content h3, .page-content h3 { font-size: 1.3em; }
.post-content h4, .page-content h4 {
    font-size: 1.1em;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-subtle);
}

/* 页面级副标题（page-content h2）的专用间距设置，约等于 1.5 行正文高，避免段落之间出现过大的空白。 */
.page-content h2 {
    margin-top: 1.5em;
    margin-bottom: 0.7em;
}
.post-content blockquote, .page-content blockquote {
    margin: 2.4em auto;
    padding: 1.2em 1.5em;
    color: var(--color-text-subtle);
    border-left: 4px solid var(--color-border);
    background: linear-gradient(135deg, rgba(0,0,0,0.02), rgba(0,0,0,0.04));
    border-radius: 8px;
}
.post-content blockquote p,
.page-content blockquote p {
    margin: 0.6em 0;
}

/* GitHub 风格警报框 */
.post-content .markdown-alert,
.page-content .markdown-alert {
    margin: 2em 0;
    padding: 1em 1.25em;
    border-left: 4px solid;
    border-radius: 6px;
    background: var(--color-bg);
}

.post-content .markdown-alert-title,
.page-content .markdown-alert-title {
    margin: 0 0 0.5em 0;
    font-weight: 600;
    font-size: 0.95em;
    display: flex;
    align-items: center;
    gap: 0.5em;
}

.post-content .markdown-alert-title svg.octicon,
.page-content .markdown-alert-title svg.octicon {
    flex-shrink: 0;
    vertical-align: text-bottom;
    fill: currentColor;
}

.post-content .markdown-alert p,
.page-content .markdown-alert p {
    margin: 0.5em 0;
}

.post-content .markdown-alert p:first-of-type,
.page-content .markdown-alert p:first-of-type {
    margin-top: 0;
}

.post-content .markdown-alert p:last-of-type,
.page-content .markdown-alert p:last-of-type {
    margin-bottom: 0;
}

/* Note - 蓝色 */
.post-content .markdown-alert-note,
.page-content .markdown-alert-note {
    border-left-color: #0969da;
    background: rgba(9, 105, 218, 0.05);
}

.post-content .markdown-alert-note .markdown-alert-title,
.page-content .markdown-alert-note .markdown-alert-title {
    color: #0969da;
}

.post-content .markdown-alert-note .markdown-alert-title svg,
.page-content .markdown-alert-note .markdown-alert-title svg {
    fill: #0969da;
}

/* Tip - 绿色 */
.post-content .markdown-alert-tip,
.page-content .markdown-alert-tip {
    border-left-color: #1a7f37;
    background: rgba(26, 127, 55, 0.05);
}

.post-content .markdown-alert-tip .markdown-alert-title,
.page-content .markdown-alert-tip .markdown-alert-title {
    color: #1a7f37;
}

.post-content .markdown-alert-tip .markdown-alert-title svg,
.page-content .markdown-alert-tip .markdown-alert-title svg {
    fill: #1a7f37;
}

/* Important - 紫色 */
.post-content .markdown-alert-important,
.page-content .markdown-alert-important {
    border-left-color: #8250df;
    background: rgba(130, 80, 223, 0.05);
}

.post-content .markdown-alert-important .markdown-alert-title,
.page-content .markdown-alert-important .markdown-alert-title {
    color: #8250df;
}

.post-content .markdown-alert-important .markdown-alert-title svg,
.page-content .markdown-alert-important .markdown-alert-title svg {
    fill: #8250df;
}

/* Warning - 橙色 */
.post-content .markdown-alert-warning,
.page-content .markdown-alert-warning {
    border-left-color: #9a6700;
    background: rgba(154, 103, 0, 0.05);
}

.post-content .markdown-alert-warning .markdown-alert-title,
.page-content .markdown-alert-warning .markdown-alert-title {
    color: #9a6700;
}

.post-content .markdown-alert-warning .markdown-alert-title svg,
.page-content .markdown-alert-warning .markdown-alert-title svg {
    fill: #9a6700;
}

/* Caution - 红色 */
.post-content .markdown-alert-caution,
.page-content .markdown-alert-caution {
    border-left-color: #cf222e;
    background: rgba(207, 34, 46, 0.05);
}

.post-content .markdown-alert-caution .markdown-alert-title,
.page-content .markdown-alert-caution .markdown-alert-title {
    color: #cf222e;
}

.post-content .markdown-alert-caution .markdown-alert-title svg,
.page-content .markdown-alert-caution .markdown-alert-title svg {
    fill: #cf222e;
}

 .post-content hr,
 .page-content hr {
     border: none;
     border-top: 1px solid var(--color-border);
     margin: 3em auto;
     width: 80%;
 }
 .post-content ul,
 .page-content ul,
 .post-content ol,
 .page-content ol {
     padding-left: 1.4em;
     margin: 1em 0;
 }
.post-content li,
.page-content li {
    margin: 0.4em 0;
}
.post-content li::marker,
.page-content li::marker {
    color: var(--color-text-subtle);
}
.post-content code, .page-content code {
    font-family: var(--font-family-mono);
    background-color: rgba(17, 17, 17, 0.06);
    padding: 0.1em 0.35em;
    border-radius: 0.35em;
    font-size: 0.95em;
}
.post-content pre, .page-content pre {
    background-color: var(--color-code-bg);
    padding: 1.2em 1.4em;
    overflow-x: auto;
    font-family: var(--font-family-mono);
    font-size: 0.9em;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    line-height: 1.7;
    margin: 2.2em auto;
    tab-size: 2;
    box-shadow: 0 18px 40px rgba(15, 15, 15, 0.05);
    position: relative;
}
.post-content pre.has-copy-btn, .page-content pre.has-copy-btn {
    padding-top: 3.2em;
}
.post-content pre code, .page-content pre code {
     font-family: inherit;
     background: none;
     padding: 0;
}
.copy-code-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 8px;
    padding: 5px 12px;
    font-size: 11px;
    letter-spacing: 0.04em;
    text-transform: none;
    color: var(--color-text);
    background-color: rgba(255, 255, 255, 0.28);
    backdrop-filter: blur(4px);
    cursor: pointer;
    opacity: 0.78;
    transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease, opacity 0.2s ease, box-shadow 0.2s ease;
}
.copy-code-btn:hover {
    color: var(--color-text-strong);
    border-color: rgba(0, 0, 0, 0.12);
    background-color: rgba(255, 255, 255, 0.5);
    opacity: 1;
}
.copy-code-btn:focus-visible {
    outline: none;
    color: var(--color-text-strong);
    border-color: rgba(0, 0, 0, 0.25);
    background-color: rgba(255, 255, 255, 0.9);
    opacity: 1;
    box-shadow: 0 0 0 2px rgba(17, 17, 17, 0.08);
}
.copy-code-btn__text {
    font-weight: 600;
    display: inline-block;
    transition: opacity 0.18s ease, transform 0.18s ease;
}
.copy-code-btn__text--transition {
    opacity: 0;
    transform: translateY(-3px);
}
@media (prefers-reduced-motion: reduce) {
    .copy-code-btn__text {
        transition: none;
    }
    .copy-code-btn__text--transition {
        opacity: 1;
        transform: none;
    }
}
.copy-toast {
    position: fixed;
    right: 30px;
    bottom: 30px;
    background: rgba(0, 0, 0, 0.85);
    color: #ffffff;
    padding: 12px 20px;
    border-radius: 999px;
    font-size: 14px;
    letter-spacing: 0.05em;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 200;
    pointer-events: none;
}
.copy-toast.visible {
    opacity: 1;
    transform: translateY(0);
}
.copy-toast:empty {
    display: none;
}
.post-content kbd,
.page-content kbd {
    font-family: var(--font-family-mono);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 0.1em 0.4em;
    background-color: rgba(0, 0, 0, 0.04);
    font-size: 0.85em;
    box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}
.post-content mark,
.page-content mark {
    background-color: #fff1b8;
    padding: 0 0.2em;
    border-radius: 0.2em;
}
.post-content table,
.page-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 2.4em 0;
    font-size: 0.95em;
}
.post-content th, .post-content td,
.page-content th, .page-content td {
    border: 1px solid var(--color-border);
    padding: 0.8em 1em;
    text-align: left;
}
.post-content thead th,
.page-content thead th {
    background-color: rgba(0, 0, 0, 0.02);
    font-weight: 600;
}
/* Mermaid 图表样式 */
.post-content .mermaid, .page-content .mermaid {
    margin: 2em auto;
    text-align: center;
    background-color: var(--color-background);
    padding: 1.5em;
    border-radius: 4px;
}
.post-content pre.language-mermaid, .page-content pre.language-mermaid {
    background-color: transparent;
    padding: 0;
    border: none;
}
.post-content .mermaid-zoomable,
.page-content .mermaid-zoomable {
    cursor: zoom-in;
    position: relative;
}
.post-content .mermaid-zoomable::after,
.page-content .mermaid-zoomable::after {
    content: "点击放大查看";
    position: absolute;
    left: 50%;
    bottom: 0.75rem;
    transform: translate(-50%, 4px);
    padding: 0.25rem 0.6rem;
    font-size: 0.75rem;
    line-height: 1.2;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.72);
    color: #fff;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease;
}
.post-content .mermaid-zoomable:hover,
.page-content .mermaid-zoomable:hover,
.post-content .mermaid-zoomable:focus-visible,
.page-content .mermaid-zoomable:focus-visible {
}
.post-content .mermaid-zoomable:hover::after,
.page-content .mermaid-zoomable:hover::after,
.post-content .mermaid-zoomable:focus-visible::after,
.page-content .mermaid-zoomable:focus-visible::after {
    opacity: 1;
    transform: translate(-50%, 0);
}

/* Mermaid 放大浮层 */
.mermaid-zoom-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: none;
    justify-content: center;
    align-items: center;
    padding: 0;
}
.mermaid-zoom-overlay.is-open {
    display: block;
    display: flex;
}
.mermaid-zoom-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(9, 9, 11, 0.75);
    backdrop-filter: blur(6px);
}
.mermaid-zoom-dialog {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 100vw;
    max-height: 100vh;
    margin: 0;
    background: var(--color-background);
    border-radius: 0;
    box-shadow: none;
    padding: 0;
    display: flex;
    flex-direction: column;
}
.mermaid-zoom-close {
    position: absolute;
    top: 0.9rem;
    right: 0.9rem;
    width: 2rem;
    height: 2rem;
    border-radius: 999px;
    border: none;
    background: rgba(15, 23, 42, 0.06);
    color: var(--color-text-main);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.18s ease, transform 0.18s ease;
}
.mermaid-zoom-close:hover,
.mermaid-zoom-close:focus-visible {
    background: rgba(15, 23, 42, 0.12);
    transform: translateY(-1px);
}
.mermaid-zoom-content {
    margin-top: 0;
    flex: 1 1 auto;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 0;
    scrollbar-width: none; /* Firefox */
}
.mermaid-zoom-content::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Edge */
}
.mermaid-zoom-content svg,
.mermaid-zoom-content .mermaid {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
}

/* 展开浮层时锁定页面滚动，避免背景跟随滚动 */
html.mermaid-zoom-open {
    overflow: hidden;
}
.post-content ul, .page-content ul,
.post-content ol, .page-content ol {
    padding-left: 1.5em;
}

/* --- 7.1 代码高亮 --- */
code[class*="language-"],
pre[class*="language-"] {
    color: #2d2d2d;
    background: var(--color-code-bg);
    text-shadow: none;
    font-family: var(--font-family-mono);
}
.post-content pre[class*="language-"],
.page-content pre[class*="language-"] {
    padding: 1.4em 1.6em;
    margin: 2.2em auto;
}
.post-content pre[class*="language-"]::-webkit-scrollbar,
.page-content pre[class*="language-"]::-webkit-scrollbar {
    height: 8px;
}
.post-content pre[class*="language-"]::-webkit-scrollbar-thumb,
.page-content pre[class*="language-"]::-webkit-scrollbar-thumb {
    background-color: rgba(17, 17, 17, 0.2);
    border-radius: 10px;
}
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
    color: #8a93a6;
}
.token.punctuation {
    color: #5c5f66;
}
.token.namespace {
    opacity: .7;
}
.token.property,
.token.tag,
.token.constant,
.token.symbol,
.token.deleted {
    color: #d15757;
}
.token.boolean,
.token.number {
    color: #ae81ff;
}
.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
    color: #4caf8c;
}
.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
    color: #bc7bff;
}
.token.atrule,
.token.attr-value,
.token.keyword {
    color: #2876d9;
}
.token.function,
.token.class-name {
    color: #d9901a;
}
.token.regex,
.token.important,
.token.variable {
    color: #f06292;
}
.token.bold {
    font-weight: 600;
}
.token.italic {
    font-style: italic;
}
.token.entity {
    cursor: help;
}

/* --- 8. 图片系统 --- */
.post-content figure, .page-content figure {
    margin: 3em auto;
    max-width: 640px; /* 默认图片尺寸 */
}
.post-content figure.full-width, .page-content figure.full-width {
    max-width: 100%; /* 全宽图片 */
}
.post-content img, .page-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 4px;
}
.post-content figcaption, .page-content figcaption {
    font-size: 14px;
    color: var(--color-meta);
    text-align: center;
    margin-top: 0.8em;
}


/* --- 10. 文章导航 --- */
.post-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--color-border);
    font-size: 16px;
}
.post-nav a {
    border-bottom: none;
    color: var(--color-text-subtle);
}

/* src/css/style.css */

/* --- NEW: Floating Action Buttons --- */
.floating-actions {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 10px;

    /* 默认隐藏 */
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
}

/* 当按钮可见时的状态 */
.floating-actions.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.action-btn {
    width: 44px;
    height: 44px;
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 50%; /* 圆形按钮 */
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: background-color 0.2s, border-color 0.2s;
}

.action-btn:hover {
    background-color: var(--color-code-bg);
    border-color: var(--color-text-subtle);
}

.action-btn svg {
    width: 20px;
    height: 20px;
    stroke: var(--color-text-subtle);
}

/* --- 文章目录导航栏（悬浮） --- */
/* 导航栏标题栏 - 固定在顶部 */
.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px 8px 20px;
    border-bottom: none;
    flex-shrink: 0;
    background-color: transparent;
    border-radius: 0;
    position: sticky;
    top: 0;
    z-index: 1;
    transition: border-bottom 0.3s ease, background-color 0.3s ease;
}

/* 预览状态下的标题栏 */
.post-toc-floating.preview .toc-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 8px 8px 0 0;
}

/* 切换按钮（在导航栏内部） */
.toc-toggle-btn {
    width: 24px;
    height: 24px;
    background: none;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    transition: opacity 0.2s;
    opacity: 0.6;
}

.toc-toggle-btn:hover {
    opacity: 1;
}

.toc-toggle-btn svg {
    stroke: var(--color-text-subtle);
    width: 16px;
    height: 16px;
}

/* 悬浮的切换按钮（当导航栏隐藏时显示） */
.toc-toggle-btn-floating {
    position: fixed;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    z-index: 100;
    transition: background-color 0.2s, border-color 0.2s, opacity 0.3s, visibility 0.3s;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.toc-toggle-btn-floating.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.toc-toggle-btn-floating:hover {
    background-color: var(--color-code-bg);
    border-color: var(--color-text-subtle);
}

.toc-toggle-btn-floating svg {
    stroke: var(--color-text-subtle);
    width: 18px;
    height: 18px;
}

.post-toc-floating {
    position: fixed;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    width: 260px;
    max-height: 65vh;
    display: flex;
    flex-direction: column;
    background-color: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: none;
    border-radius: 0;
    box-shadow: none;
    font-size: 14px;
    line-height: 1.6;
    z-index: 99;
    
    /* 默认完全显示 */
    opacity: 1;
    visibility: visible;
    transition: background-color 0.3s ease, backdrop-filter 0.3s ease, border 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    pointer-events: auto;
}

/* 悬停预览状态：显示半透明毛玻璃样式 */
.post-toc-floating.preview {
    background-color: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.post-toc-floating.visible {
    /* 显示状态 */
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%);
}

.post-toc-floating.hidden {
    /* 隐藏状态 */
    opacity: 0;
    visibility: hidden;
    transform: translateX(20px) translateY(-50%);
    pointer-events: none;
}

.post-toc-floating.hidden.preview {
    /* 预览状态：鼠标悬停在按钮上时显示 */
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%);
    pointer-events: auto;
    /* 预览状态也应用半透明样式 */
    background-color: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.toc-title {
    font-weight: 600;
    color: var(--color-text-strong);
    font-size: 15px;
    margin: 0;
}

.toc-list {
    list-style: none;
    padding: 0 20px 20px 20px;
    margin: 0;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
    scrollbar-width: none; /* Firefox: hide scrollbar */
    -ms-overflow-style: none; /* IE/Edge legacy */
}

.toc-list::-webkit-scrollbar {
    display: none; /* WebKit: hide scrollbar */
}

.toc-list li {
    margin-bottom: 8px;
}

.toc-list a {
    color: var(--color-text-subtle);
    border-bottom: none;
    display: block;
    padding: 4px 0;
    transition: color 0.2s;
    text-decoration: none;
}

.toc-list a:hover {
    color: var(--color-text-strong);
}

.toc-list a.active {
    color: var(--color-text-strong);
    font-weight: 500;
}

/* h1 标题样式（顶级标题） */
.toc-list > li.toc-h1 > a {
    font-weight: 600;
    padding-left: 0;
    font-size: 15px;
    color: var(--color-text-strong);
}

/* h2 标题样式 */
.toc-list > li > a {
    font-weight: 500;
    padding-left: 0;
}

/* h3 标题样式（嵌套） */
.toc-list > li > ul {
    list-style: none;
    padding-left: 12px;
    margin-top: 4px;
    margin-bottom: 8px;
}

.toc-list > li > ul > li > a {
    font-weight: 400;
    font-size: 13px;
    color: var(--color-meta);
}

.toc-list > li > ul > li > a:hover,
.toc-list > li > ul > li > a.active {
    color: var(--color-text-subtle);
}

/* 工具类：仅供屏幕阅读器使用 */
.screen-reader-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* 脚注预览浮层 */
.footnote-preview {
    position: absolute;
    z-index: 40;
    max-width: min(320px, calc(100vw - 32px));
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    background-color: var(--color-background);
    box-shadow: 0 18px 45px rgba(15, 15, 15, 0.12);
    font-size: 0.85em;
    line-height: 1.5;
    color: var(--color-text);
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition: opacity 0.15s ease, transform 0.15s ease;
    pointer-events: none;
}

.footnote-preview.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.footnote-preview::before,
.footnote-preview::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    border-style: solid;
}

.footnote-preview::before {
    border-width: 10px 10px 0 10px;
    border-color: var(--color-border) transparent transparent transparent;
    bottom: -10px;
}

.footnote-preview::after {
    border-width: 9px 9px 0 9px;
    border-color: var(--color-background) transparent transparent transparent;
    bottom: -9px;
}

.footnote-preview[data-placement="bottom"]::before {
    bottom: auto;
    top: -10px;
    border-width: 0 10px 10px 10px;
    border-color: transparent transparent var(--color-border) transparent;
}

.footnote-preview[data-placement="bottom"]::after {
    bottom: auto;
    top: -9px;
    border-width: 0 9px 9px 9px;
    border-color: transparent transparent var(--color-background) transparent;
}

.footnote-target-highlight {
    animation: footnote-target-highlight 1.4s ease;
}

@keyframes footnote-target-highlight {
    0% {
        background-color: rgba(255, 235, 167, 0.9);
        box-shadow: 0 0 0 6px rgba(255, 235, 167, 0.2);
    }
    100% {
        background-color: transparent;
        box-shadow: none;
    }
}

/* --- 脚注相关样式 --- */
.post-content .footnote-ref,
.page-content .footnote-ref {
    font-size: 0.85em;
    vertical-align: super;
    line-height: 0;
}

.post-content .footnote-ref a,
.page-content .footnote-ref a {
    color: var(--color-text-subtle);
    border-bottom: none;
    text-decoration: none;
    padding: 0 2px;
    border-radius: 2px;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.post-content .footnote-ref a:hover,
.page-content .footnote-ref a:focus-visible {
    color: var(--color-text-strong);
    background-color: var(--color-code-bg);
}

.post-content .footnotes-sep,
.page-content .footnotes-sep {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 3em 0 2em;
}

.post-content .footnotes,
.page-content .footnotes {
    margin-top: 3em;
    padding-top: 2em;
    font-size: 0.9em;
    color: var(--color-text-subtle);
}

.post-content .footnotes-list,
.page-content .footnotes-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.post-content .footnote-item,
.page-content .footnote-item {
    margin-bottom: 1em;
    padding-left: 1.5em;
    position: relative;
}

.post-content .footnote-item::before,
.page-content .footnote-item::before {
    content: counter(footnote-counter);
    counter-increment: footnote-counter;
    position: absolute;
    left: 0;
    color: var(--color-text-subtle);
    font-weight: 600;
}

.post-content .footnotes-list,
.page-content .footnotes-list {
    counter-reset: footnote-counter;
}

.post-content .footnote-backref,
.page-content .footnote-backref {
    color: var(--color-text-subtle);
    border-bottom: none;
    text-decoration: none;
    margin-left: 0.5em;
    font-size: 1.2em;
    line-height: 0;
    vertical-align: baseline;
    transition: color 0.2s ease;
}

.post-content .footnote-backref:hover,
.page-content .footnote-backref:focus-visible {
    color: var(--color-text-strong);
}

/* --- Details/Summary 折叠元素 --- */
.post-content details,
.page-content details {
    margin: 1.5em 0;
    padding: 1em;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background-color: var(--color-code-bg);
}

.post-content details summary,
.page-content details summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--color-text-strong);
    padding: 0.5em 0;
    user-select: none;
    list-style: none;
    position: relative;
    padding-left: 1.5em;
}

.post-content details summary::-webkit-details-marker,
.page-content details summary::-webkit-details-marker {
    display: none;
}

.post-content details summary::before,
.page-content details summary::before {
    content: "▶";
    position: absolute;
    left: 0;
    font-size: 0.8em;
    transition: transform 0.2s ease;
    color: var(--color-text-subtle);
}

.post-content details[open] summary::before,
.page-content details[open] summary::before {
    transform: rotate(90deg);
}

.post-content details[open] summary,
.page-content details[open] summary {
    margin-bottom: 0.5em;
}

.post-content details > *:not(summary),
.page-content details > *:not(summary) {
    margin-top: 0.5em;
}

/* --- 任务列表（Task List / Checkbox） --- */
.post-content input[type="checkbox"],
.page-content input[type="checkbox"] {
    margin-right: 0.5em;
    cursor: pointer;
    accent-color: var(--color-text-strong);
}

.post-content li:has(input[type="checkbox"]),
.page-content li:has(input[type="checkbox"]) {
    list-style: none;
    padding-left: 0;
}

.post-content li:has(input[type="checkbox"])::marker,
.page-content li:has(input[type="checkbox"])::marker {
    display: none;
}

/* --- 定义列表（Definition List） --- */
.post-content dl,
.page-content dl {
    margin: 1.5em 0;
}

.post-content dt,
.page-content dt {
    font-weight: 600;
    color: var(--color-text-strong);
    margin-top: 1em;
    margin-bottom: 0.3em;
}

.post-content dt:first-child,
.page-content dt:first-child {
    margin-top: 0;
}

.post-content dd,
.page-content dd {
    margin-left: 1.5em;
    margin-bottom: 0.5em;
    color: var(--color-text);
}

/* --- 缩写（Abbreviation） --- */
.post-content abbr,
.page-content abbr {
    text-decoration: underline;
    text-decoration-style: dotted;
    text-underline-offset: 0.2em;
    cursor: help;
    border-bottom: none;
}

/* 404 页面：模拟终端界面 */
.page-404 {
    padding: 0 0 40px;
    margin-top: -42px;
}

.page-404__terminal {
    display: block;
}

.page-404 .terminal-window {
    width: 100%;
    max-width: none;
    background: transparent;
    border-radius: 0;
    border: none;
    box-shadow: none;
    overflow: visible;
    display: flex;
    flex-direction: column;
}

.page-404 .terminal-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 0 8px;
    background: transparent;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.page-404 .terminal-header__dots {
    display: flex;
    gap: 6px;
}

.page-404 .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: block;
    opacity: 0.8;
}

.page-404 .dot-red { background-color: #fb7185; }
.page-404 .dot-yellow { background-color: #fbbf24; }
.page-404 .dot-green { background-color: #22c55e; }

.page-404 .terminal-title {
    margin: 0;
    color: var(--color-text-subtle);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: lowercase;
    font-family: var(--font-family-mono);
}

.page-404 .terminal-body {
    padding: 24px 0 0;
    min-height: 0;
    font-family: var(--font-family-mono);
    color: var(--color-text);
    background: transparent;
    line-height: 1.6;
}

.page-404 .prompt {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 10px;
}

.page-404 .user { color: #3b82f6; }
.page-404 .path { color: #14b8a6; }
.page-404 .cmd { color: var(--color-text-strong); }

.page-404 .output {
    color: var(--color-meta);
    font-size: 14px;
    margin-bottom: 18px;
}

.page-404 .error-text {
    color: #e03131;
    font-weight: 600;
}

.page-404 .typewriter {
    min-height: 24px;
    margin-bottom: 22px;
}

.page-404__suggestions .comment {
    display: block;
    color: var(--color-meta);
    margin-bottom: 14px;
    font-size: 15px;
}

.page-404__suggestions .command-list {
    list-style: none;
    padding-left: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.page-404__suggestions li a {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-family-mono);
    color: var(--color-text);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    padding: 2px 0;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.page-404__suggestions li a:hover,
.page-404__suggestions li a:focus-visible {
    color: var(--color-text-strong);
    border-bottom-color: rgba(255, 255, 255, 0.2);
}

.page-404__suggestions .arrow {
    color: var(--color-accent, #22c55e);
    font-size: 16px;
}

.page-404__suggestions .link-cmd {
    color: var(--color-text-strong);
    font-weight: 600;
}

.page-404__suggestions .link-desc {
    color: var(--color-meta);
    margin-left: 4px;
    white-space: nowrap;
}

.page-404 .hidden {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.page-404 .visible {
    opacity: 1;
    pointer-events: auto;
}

.page-404 .cursor {
    display: inline-block;
    width: 10px;
    height: 16px;
    background-color: var(--color-text);
    animation: page404-blink 1s step-end infinite;
    margin-left: 6px;
}

@keyframes page404-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.page-404 .prompt input {
    border: none;
    background: transparent;
}

@media (max-width: 640px) {
    .page-404 { padding: 0 0 30px; margin-top: -20px; }
    .page-404 .terminal-body { padding-top: 18px; font-size: 14px; }
}

/* --- 11. 响应式设计 --- */
@media (max-width: 1200px) {
    /* 在较小屏幕上隐藏导航栏 */
    .post-toc-floating {
        display: none !important;
    }
}

@media (max-width: 600px) {
    .container { padding: 20px 15px; }
    .site-header { flex-direction: column; align-items: flex-start; margin-bottom: 30px; }
    .site-title { margin-bottom: 10px; }
    .site-nav { margin-left: -5px; }
    .site-nav a { margin: 0 10px 0 0; }
    
    .post-title { font-size: 22px; }
    .post-excerpt { font-size: 16px; }

    .post-full-title, .page-title { font-size: 30px; }
    .post-content, .page-content { font-size: 17px; }
}