/* ==========================================================================
   周睿 · 个人主页 — 设计系统 v2
   --------------------------------------------------------------------------
   组织方式：
     01 设计令牌（颜色 / 排版 / 间距 / 动效）
     02 基础重置与排版
     03 通用布局与组件原子（container / section-head / card / badge / tag / btn）
     04 顶部导航（含二级导航与移动端抽屉）
     05 Hero 首屏
     06 首页各区块（stats / overview / news / publications / posts）
     07 内页（文章 / 简历 / 研究 / 项目 / 分享 / 书单 / 爱好 / 404）
     08 搜索、目录、滚动进度、回到顶部等交互层
     09 响应式断点
     10 无障碍、动效偏好与打印样式

   约定：所有颜色/圆角/阴影/字体都走 01 的变量，不要在组件里写死色值。
   ========================================================================== */

/* ==========================================================================
   01 设计令牌
   ========================================================================== */
:root {
    /* 主色：导航、标题强调、实心按钮 */
    --color-primary: #1e3a5f;
    --color-primary-light: #2c5282;
    --color-accent: #2b6cb0;
    --color-accent-strong: #1c4f8a;
    --color-accent-soft: rgba(43, 108, 176, 0.10);
    --color-gradient-a: #1e3a5f;
    --color-gradient-b: #2b6cb0;
    --color-gradient-c: #4299e1;

    /* 文字层级：--color-text-mute 需满足 WCAG AA（正文 ≥4.5:1）
       #718096 在 --color-bg-alt 上只有 3.78:1，故调深到 #5f6c7f（约 5.0:1） */
    --color-text: #16202e;
    --color-text-soft: #4a5568;
    --color-text-mute: #5f6c7f;

    /* 背景与分隔线 */
    --color-border: #e3e8ef;
    --color-border-strong: #cbd5e0;
    /* 半透明底色/描边用显式 rgba，不用 color-mix()：
       color-mix 在部分引擎里百分比解析不正确，会把 86% 当成 100%（实测 Edge 下
       半透明导航底色变成不透明，直接把当前页高亮文字压到 2:1 对比度） */
    --color-border-soft: rgba(227, 232, 239, 0.6);
    --color-header-bg: rgba(255, 255, 255, 0.86);
    --hero-tint-1: rgba(66, 153, 225, 0.26);
    --hero-tint-2: rgba(43, 108, 176, 0.22);
    --hero-tint-3: rgba(30, 58, 95, 0.12);
    --accent-halo: rgba(43, 108, 176, 0.08);
    --color-bg: #ffffff;
    --color-bg-alt: #f6f8fc;
    --color-bg-card: #ffffff;
    --color-bg-elevated: #ffffff;
    --color-bg-sunken: #eef2f8;
    --color-overlay: rgba(15, 22, 36, 0.5);

    /* 语义色 */
    --color-warn-bg: #fef3c7;
    --color-warn-fg: #92400e;
    --color-ok-bg: #d1fae5;
    --color-ok-fg: #065f46;
    --color-star: #f59e0b;

    /* 阴影 */
    --color-shadow: rgba(16, 32, 56, 0.10);
    --shadow-xs: 0 1px 2px rgba(16, 32, 56, 0.05);
    --shadow-sm: 0 1px 3px rgba(16, 32, 56, 0.06), 0 1px 2px rgba(16, 32, 56, 0.04);
    --shadow-md: 0 6px 18px rgba(16, 32, 56, 0.08), 0 2px 6px rgba(16, 32, 56, 0.04);
    --shadow-lg: 0 18px 48px rgba(16, 32, 56, 0.14), 0 4px 12px rgba(16, 32, 56, 0.06);
    --shadow-glow: 0 14px 40px -12px rgba(43, 108, 176, 0.45);

    /* 圆角 */
    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --radius-pill: 999px;

    /* 排版 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
                 "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Cascadia Code", "JetBrains Mono", "Roboto Mono",
                 Consolas, "Liberation Mono", monospace;
    --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia,
                    "Songti SC", "Noto Serif SC", serif;

    /* 布局 */
    --max-width: 1120px;
    --max-width-narrow: 780px;
    --header-height: 66px;
    --section-pad: clamp(52px, 7vw, 88px);
    --gutter: clamp(18px, 4vw, 28px);

    /* 动效 */
    --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
    --ease-spring: cubic-bezier(0.34, 1.36, 0.64, 1);
    --t-fast: 0.16s;
    --t-mid: 0.28s;
    --t-slow: 0.6s;

    color-scheme: light;
}

[data-theme="dark"] {
    --color-primary: #7cc0f8;
    --color-primary-light: #a5d8ff;
    --color-accent: #63b3ed;
    --color-accent-strong: #90cdf4;
    --color-accent-soft: rgba(99, 179, 237, 0.14);
    --color-gradient-a: #4dabf7;
    --color-gradient-b: #748ffc;
    --color-gradient-c: #66d9e8;

    --color-text: #e6edf6;
    --color-text-soft: #a8b6c8;
    --color-text-mute: #7c8ba1;

    --color-border: #26313f;
    --color-border-strong: #38455a;
    --color-border-soft: rgba(38, 49, 63, 0.6);
    --color-header-bg: rgba(12, 17, 24, 0.86);
    --hero-tint-1: rgba(77, 171, 247, 0.22);
    --hero-tint-2: rgba(116, 143, 252, 0.20);
    --hero-tint-3: rgba(77, 171, 247, 0.12);
    --accent-halo: rgba(99, 179, 237, 0.14);
    --color-bg: #0c1118;
    --color-bg-alt: #111823;
    --color-bg-card: #141c27;
    --color-bg-elevated: #18212e;
    --color-bg-sunken: #0a0f16;
    --color-overlay: rgba(2, 6, 12, 0.68);

    --color-warn-bg: rgba(245, 158, 11, 0.16);
    --color-warn-fg: #fbbf24;
    --color-ok-bg: rgba(16, 185, 129, 0.16);
    --color-ok-fg: #34d399;

    --color-shadow: rgba(0, 0, 0, 0.5);
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.45);
    --shadow-md: 0 8px 22px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 22px 56px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 16px 44px -14px rgba(99, 179, 237, 0.55);

    color-scheme: dark;
}

/* ==========================================================================
   02 基础重置与排版
   ========================================================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 16px);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.75;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

/* partials 注入前的防闪烁（partial-loader 会切掉这个类） */
html.partials-loading body { visibility: hidden; }

h1, h2, h3, h4 {
    line-height: 1.28;
    font-weight: 700;
    letter-spacing: -0.01em;
    text-wrap: balance;
}

p { text-wrap: pretty; }

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--t-fast) var(--ease-out);
}

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

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

ul, ol { list-style-position: inside; }

code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    padding: 0.1em 0.38em;
    border-radius: var(--radius-xs);
    color: var(--color-primary);
}

hr {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: 32px 0;
}

::selection {
    background: var(--color-accent-soft);
    color: var(--color-text);
}

/* 滚动条 */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-border-strong) transparent;
}

*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: var(--radius-pill);
    border: 3px solid transparent;
    background-clip: content-box;
}
*::-webkit-scrollbar-thumb:hover { background-clip: content-box; background-color: var(--color-text-mute); }

/* 焦点环：仅键盘可见 */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-xs);
}

[data-theme="dark"] :focus-visible { outline-color: var(--color-accent); }

/* 跳转正文链接 */
.skip-link {
    position: fixed;
    left: 50%;
    top: 8px;
    transform: translate(-50%, -160%);
    z-index: 1200;
    padding: 10px 18px;
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    font-size: 14px;
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-md);
    text-decoration: none;
    transition: transform var(--t-mid) var(--ease-out);
}

.skip-link:focus {
    transform: translate(-50%, 0);
    color: #fff;
    outline: 2px solid #fff;
    outline-offset: -4px;
}

.accent { color: var(--color-primary); }

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

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

/* ==========================================================================
   03 通用布局与组件原子
   ========================================================================== */
.page-main {
    padding: clamp(36px, 5vw, 60px) 0 clamp(64px, 8vw, 96px);
    min-height: calc(100vh - var(--header-height) - 120px);
}

.section { padding: var(--section-pad) 0; }

.section-alt {
    background: var(--color-bg-alt);
    border-block: 1px solid var(--color-border);
}

/* 区块标题 */
.section-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 18px;
    flex-wrap: wrap;
    margin-bottom: clamp(24px, 3vw, 38px);
}

.section-head .section-title,
.section-title {
    font-size: clamp(24px, 2.6vw, 32px);
    font-weight: 700;
    color: var(--color-text);
    margin: 0;
    display: flex;
    align-items: baseline;
    gap: 14px;
    flex-wrap: wrap;
    position: relative;
    padding-bottom: 12px;
}

/* 标题下的小渐变短线 */
.section-title::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 46px;
    height: 3px;
    border-radius: var(--radius-pill);
    background: linear-gradient(90deg, var(--color-gradient-a), var(--color-gradient-c));
}

.section-head .section-title { padding-bottom: 0; }
.section-head .section-title::after { display: none; }

.section-eyebrow {
    display: block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.section-sub {
    color: var(--color-text-soft);
    font-size: 15px;
    margin-top: 6px;
    max-width: 62ch;
}

.see-all {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-mute);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    background: var(--color-bg-card);
    transition: all var(--t-fast) var(--ease-out);
    white-space: nowrap;
}

.see-all:hover {
    color: var(--color-primary);
    border-color: var(--color-accent);
    transform: translateX(2px);
}

/* 页面大标题 */
.page-title {
    font-size: clamp(30px, 4vw, 44px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
    color: var(--color-text);
    padding-bottom: 18px;
    border-bottom: 1px solid var(--color-border);
    position: relative;
}

.page-title::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 84px;
    height: 3px;
    border-radius: var(--radius-pill);
    background: linear-gradient(90deg, var(--color-gradient-a), var(--color-gradient-c));
}

.lead {
    font-size: clamp(16px, 1.6vw, 18px);
    color: var(--color-text-soft);
    margin-bottom: clamp(28px, 4vw, 44px);
    line-height: 1.8;
    max-width: 70ch;
}

.lead a { font-weight: 600; }

/* 内容区块 */
.content-block { margin-bottom: clamp(36px, 5vw, 56px); }

.content-block > h2 {
    font-size: clamp(19px, 2vw, 23px);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-block p {
    font-size: 16px;
    color: var(--color-text-soft);
    line-height: 1.85;
    margin-bottom: 14px;
}

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

/* 通用卡片 */
.card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(20px, 2.4vw, 28px);
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

/* 卡片顶部渐变高光（悬停时出现） */
.card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    background: linear-gradient(90deg, var(--color-gradient-a), var(--color-gradient-c));
    opacity: 0;
    transition: opacity var(--t-mid) var(--ease-out);
}

.card:hover::before { opacity: 1; }

.card-flat:hover { transform: none; }

.grid-2,
.grid-3,
.card-grid {
    display: grid;
    gap: clamp(16px, 2vw, 22px);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }

/* 徽章与标签 */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.02em;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    background: var(--color-bg-sunken);
    color: var(--color-text-soft);
    border: 1px solid var(--color-border);
    white-space: nowrap;
}

.badge-accent {
    background: var(--color-accent-soft);
    color: var(--color-accent);
    border-color: transparent;
}

.badge-dot::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    flex: none;
}

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

.tag,
.pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-bg-alt);
    color: var(--color-text-soft);
    font-size: 13px;
    font-weight: 500;
    padding: 5px 13px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--color-border);
    transition: all var(--t-fast) var(--ease-out);
}

.tag:hover {
    color: var(--color-primary);
    border-color: var(--color-accent);
    background: var(--color-bg-card);
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 24px;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    line-height: 1.2;
    border-radius: var(--radius-pill);
    cursor: pointer;
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
    isolation: isolate;
    transition: transform var(--t-fast) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                background var(--t-fast) var(--ease-out),
                border-color var(--t-fast) var(--ease-out),
                color var(--t-fast) var(--ease-out);
}

.btn:active { transform: translateY(1px) scale(0.99); }

.btn-primary {
    background: linear-gradient(135deg, var(--color-gradient-a) 0%, var(--color-gradient-b) 100%);
    color: #fff;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* 按钮扫光 */
.btn-primary::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.32), transparent);
    transform: skewX(-18deg);
    transition: left 0.55s var(--ease-out);
    z-index: -1;
}

.btn-primary:hover::after { left: 130%; }

.btn-ghost {
    background: var(--color-bg-card);
    color: var(--color-primary);
    border-color: var(--color-border-strong);
}

.btn-ghost:hover {
    color: var(--color-primary);
    border-color: var(--color-accent);
    background: var(--color-accent-soft);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.btn-sm { padding: 7px 14px; font-size: 13px; }

.btn:disabled,
.btn[aria-disabled="true"] {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
}

/* ==========================================================================
   04 顶部导航
   ========================================================================== */
/* 顶部滚动进度条（Lead 的 ui.js 会填充 --scroll） */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 100%;
    transform: scaleX(var(--scroll, 0));
    transform-origin: 0 50%;
    background: linear-gradient(90deg, var(--color-gradient-a), var(--color-gradient-c));
    z-index: 200;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--t-mid) var(--ease-out);
}

.scroll-progress.is-active { opacity: 1; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 150;
    background: var(--color-header-bg);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--t-mid) var(--ease-out),
                background var(--t-mid) var(--ease-out);
}

.site-header.is-scrolled {
    box-shadow: 0 6px 24px -14px var(--color-shadow);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    height: var(--header-height);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--color-text);
    font-weight: 700;
    letter-spacing: -0.01em;
    flex: none;
}

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

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 11px;
    background: linear-gradient(135deg, var(--color-gradient-a), var(--color-gradient-b));
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.04em;
    box-shadow: var(--shadow-sm);
    transition: transform var(--t-mid) var(--ease-spring), box-shadow var(--t-mid) var(--ease-out);
}

.brand:hover .brand-mark {
    transform: rotate(-4deg) scale(1.05);
    box-shadow: var(--shadow-glow);
}

.brand-text { font-size: 17px; white-space: nowrap; }

.site-nav {
    display: flex;
    align-items: center;
    gap: 2px;
    margin-left: auto;
}

.nav-link {
    position: relative;
    padding: 8px 14px;
    color: var(--color-text-soft);
    font-size: 15px;
    font-weight: 550;
    border-radius: var(--radius-pill);
    white-space: nowrap;
    transition: color var(--t-fast) var(--ease-out),
                background var(--t-fast) var(--ease-out);
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-bg-sunken);
}

.nav-link.active {
    color: var(--color-primary);
    background: var(--color-accent-soft);
    font-weight: 650;
}

/* 深色模式下 --color-primary 是浅蓝，浅蓝底 + 浅蓝字对比不足（约 2.1:1）。
   改为「浅蓝底 + 深蓝字」既能保持当前页的视觉强调，也满足 WCAG AA。 */
[data-theme="dark"] .site-nav .nav-link.active {
    color: #0c1118;
    background: var(--color-primary-light);
}

[data-theme="dark"] .nav-more-menu a.active {
    color: #0c1118;
    background: var(--color-primary-light);
}

/* 当前页底部小圆点 */
.nav-link.active::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 1px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    transform: translateX(-50%);
    background: var(--color-accent);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: none;
}

.nav-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 38px;
    height: 38px;
    padding: 0 9px;
    border-radius: var(--radius-pill);
    background: transparent;
    border: 1px solid transparent;
    color: var(--color-text-soft);
    font-family: inherit;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--t-fast) var(--ease-out);
}

.nav-action:hover {
    color: var(--color-primary);
    background: var(--color-bg-sunken);
    border-color: var(--color-border);
}

.nav-action svg { flex: none; }

/* 明暗图标：按 data-theme 显示 */
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: block; }
:root:not([data-theme]) .icon-moon { display: none; }
:root:not([data-theme]) .icon-sun { display: block; }

/* 语言切换 */
.nav-lang-group {
    display: inline-flex;
    align-items: center;
    gap: 1px;
    height: 38px;
    padding: 0 4px;
    border-radius: var(--radius-pill);
    background: var(--color-bg-sunken);
    border: 1px solid var(--color-border);
}

.nav-lang-zh,
.nav-lang-en {
    color: var(--color-text-soft);
    font-size: 12.5px;
    font-weight: 700;
    padding: 4px 9px;
    border-radius: var(--radius-pill);
    transition: all var(--t-fast) var(--ease-out);
}

.nav-lang-zh:hover,
.nav-lang-en:hover {
    color: var(--color-primary);
    background: var(--color-bg-card);
}

.nav-lang-zh.active,
.nav-lang-en.active {
    color: #fff;
    background: linear-gradient(135deg, var(--color-gradient-a), var(--color-gradient-b));
}

[data-theme="dark"] .nav-lang-zh.active,
[data-theme="dark"] .nav-lang-en.active { color: #0c1118; }

.nav-lang-divider {
    color: var(--color-border-strong);
    user-select: none;
    font-size: 12px;
}

/* 二级导航（博客 / 分享 / 书单 / 爱好） */
.nav-more { position: relative; }

.nav-more-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    border: 0;
    background: transparent;
    color: var(--color-text-soft);
    font-family: inherit;
    font-size: 15px;
    font-weight: 550;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--t-fast) var(--ease-out);
}

.nav-more-toggle:hover,
.nav-more-toggle[aria-expanded="true"] {
    color: var(--color-primary);
    background: var(--color-bg-sunken);
}

.nav-more-toggle svg {
    transition: transform var(--t-mid) var(--ease-out);
}

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

.nav-more-menu {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    min-width: 190px;
    padding: 8px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 2px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.98);
    transform-origin: top right;
    transition: opacity var(--t-fast) var(--ease-out),
                transform var(--t-fast) var(--ease-out),
                visibility var(--t-fast);
}

.nav-more-menu.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.nav-more-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text-soft);
    font-size: 14.5px;
    font-weight: 550;
    transition: all var(--t-fast) var(--ease-out);
}

.nav-more-menu a:hover {
    color: var(--color-primary);
    background: var(--color-bg-sunken);
}

.nav-more-menu a.active {
    color: var(--color-accent);
    background: var(--color-accent-soft);
}

.nav-more-menu .nav-menu-icon {
    font-size: 15px;
    line-height: 1;
    width: 20px;
    text-align: center;
    flex: none;
}

/* 移动端在主菜单里展示的二级链接与语言切换 */
.nav-mobile-extra { display: none; }

/* 汉堡按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 0 9px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background: var(--color-text);
    transition: transform var(--t-mid) var(--ease-out),
                opacity var(--t-fast) var(--ease-out);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   05 Hero 首屏
   ========================================================================== */
.hero {
    position: relative;
    overflow: hidden;
    padding: clamp(56px, 9vw, 104px) 0 clamp(48px, 7vw, 84px);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

/* 背景：两团柔光和一层网格 */
.hero::before {
    content: "";
    position: absolute;
    inset: -30% -10% auto -10%;
    height: 150%;
    background:
        radial-gradient(46% 56% at 12% 18%, var(--hero-tint-1) 0%, transparent 70%),
        radial-gradient(42% 52% at 88% 8%, var(--hero-tint-2) 0%, transparent 72%),
        radial-gradient(60% 60% at 70% 96%, var(--hero-tint-3) 0%, transparent 70%);
    filter: blur(6px);
    pointer-events: none;
    animation: hero-drift 22s ease-in-out infinite alternate;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, var(--color-border-soft) 1px, transparent 1px),
        linear-gradient(to bottom, var(--color-border-soft) 1px, transparent 1px);
    background-size: 46px 46px;
    mask-image: radial-gradient(72% 62% at 50% 34%, #000 0%, transparent 78%);
    -webkit-mask-image: radial-gradient(72% 62% at 50% 34%, #000 0%, transparent 78%);
    opacity: 0.55;
    pointer-events: none;
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
    /* 兜底：极老的引擎不支持 mask-image 时，网格可能糊住整块背景 */
    .hero::after { opacity: 0.25; }
}

@keyframes hero-drift {
    from { transform: translate3d(-2%, -1%, 0) scale(1.02); }
    to { transform: translate3d(2%, 2%, 0) scale(1.08); }
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(32px, 6vw, 72px);
    align-items: center;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 12.5px;
    color: var(--color-accent);
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 18px;
    padding: 6px 14px 6px 12px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-xs);
}

.hero-eyebrow::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 0 4px var(--color-accent-soft);
    animation: pulse-dot 2.6s ease-in-out infinite;
}

.hero-eyebrow:empty { display: none; }

@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 4px var(--color-accent-soft); }
    50% { box-shadow: 0 0 0 7px var(--accent-halo); }
}

.hero-title {
    font-size: clamp(30px, 5.2vw, 54px);
    line-height: 1.16;
    font-weight: 750;
    letter-spacing: -0.025em;
    margin-bottom: 20px;
    color: var(--color-text);
}

.hero-title .accent {
    background: linear-gradient(120deg, var(--color-gradient-a) 0%, var(--color-gradient-b) 45%, var(--color-gradient-c) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

[data-theme="dark"] .hero-title .accent {
    background: linear-gradient(120deg, #74c0fc 0%, #91a7ff 50%, #66d9e8 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(16px, 1.8vw, 18.5px);
    color: var(--color-text-soft);
    line-height: 1.8;
    margin-bottom: 30px;
    max-width: 58ch;
}

.hero-cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.hero-meta {
    display: flex;
    gap: 10px 20px;
    flex-wrap: wrap;
    font-size: 14.5px;
    padding-top: 22px;
    border-top: 1px dashed var(--color-border);
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--color-text-soft);
    font-weight: 550;
    /* 触摸目标 ≥24px（WCAG 2.2 AA 2.5.8）：行高 24px 刚好压线，补一点内边距 */
    min-height: 28px;
    padding: 2px 0;
    transition: all var(--t-fast) var(--ease-out);
}

.meta-item:hover {
    color: var(--color-primary);
    transform: translateY(-1px);
}

.hero-avatar {
    position: relative;
    width: clamp(168px, 20vw, 250px);
    height: clamp(168px, 20vw, 250px);
    flex: none;
    border-radius: 50%;
    overflow: hidden;
    background: var(--color-bg-alt);
    box-shadow: var(--shadow-md);
    isolation: isolate;
}

/* 渐变外环 */
.hero-avatar::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 50%;
    padding: 3px;
    background: linear-gradient(135deg, var(--color-gradient-a), var(--color-gradient-c), var(--color-gradient-b));
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    z-index: 2;
}

/* 背后柔光 */
.hero-avatar::before {
    content: "";
    position: absolute;
    inset: -14%;
    z-index: -1;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 25%, var(--color-accent-soft), transparent 68%);
}

.hero-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.avatar-placeholder {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px;
    color: var(--color-text-mute);
    font-size: 14px;
    font-weight: 600;
    line-height: 1.6;
    background: linear-gradient(135deg, var(--color-bg-sunken) 0%, var(--color-bg-alt) 100%);
}

/* 首屏内容入场 */
.hero-text > * {
    animation: rise-in 0.7s var(--ease-out) backwards;
}

.hero-text > *:nth-child(1) { animation-delay: 0.04s; }
.hero-text > *:nth-child(2) { animation-delay: 0.12s; }
.hero-text > *:nth-child(3) { animation-delay: 0.2s; }
.hero-text > *:nth-child(4) { animation-delay: 0.28s; }
.hero-text > *:nth-child(5) { animation-delay: 0.36s; }

.hero-avatar { animation: rise-in 0.8s var(--ease-out) 0.18s backwards; }

@keyframes rise-in {
    from { opacity: 0; transform: translateY(18px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   06 首页区块
   ========================================================================== */
/* --- 数据一览 --- */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 210px), 1fr));
    gap: clamp(12px, 1.6vw, 18px);
    margin-bottom: clamp(24px, 3vw, 36px);
}

.stat-card {
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.stat-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex: none;
    font-size: 21px;
    line-height: 1;
    border-radius: var(--radius-sm);
    background: var(--color-accent-soft);
}

.stat-text { flex: 1; min-width: 0; }

.stat-label {
    font-size: 12px;
    color: var(--color-text-mute);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 2px;
    font-weight: 600;
}

.stat-value {
    font-size: clamp(20px, 2.2vw, 25px);
    font-weight: 750;
    color: var(--color-text);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.stat-card[data-stat] .stat-value img { vertical-align: middle; }

/* 贡献图 */
.github-chart {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    box-shadow: var(--shadow-xs);
    overflow-x: auto;
}

.github-chart img {
    width: 100%;
    min-width: 560px;
    /* 预留高度：贡献图是第三方图片，加载/失败时避免区块突然塌陷或留白 */
    min-height: 132px;
    border-radius: var(--radius-xs);
    opacity: 0.95;
}

.github-chart-caption {
    font-size: 13px;
    color: var(--color-text-mute);
    margin-top: 10px;
    text-align: center;
}

/* --- 个人概览 --- */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
    gap: clamp(16px, 2vw, 22px);
}

.info-card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.info-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    background: linear-gradient(90deg, var(--color-gradient-a), var(--color-gradient-c));
    opacity: 0;
    transition: opacity var(--t-mid) var(--ease-out);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.info-card:hover::before { opacity: 1; }

.info-card h3 {
    font-size: 15.5px;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-card p,
.info-card li {
    font-size: 14px;
    color: var(--color-text-soft);
    line-height: 1.7;
    margin-bottom: 7px;
}

.info-card p:last-child,
.info-card li:last-child { margin-bottom: 0; }

.info-card ul { list-style: none; }

.info-card li {
    position: relative;
    padding-left: 16px;
}

.info-card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.72em;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-accent);
    opacity: 0.7;
}

/* --- 最新动态时间线 --- */
.timeline {
    list-style: none;
    position: relative;
    padding-left: 26px;
    margin: 0;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    border-radius: var(--radius-pill);
    background: linear-gradient(180deg, var(--color-accent), transparent);
    opacity: 0.35;
}

.timeline-item {
    position: relative;
    padding-bottom: 26px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
    content: "";
    position: absolute;
    left: -26px;
    top: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-bg);
    border: 2.5px solid var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-soft);
    transition: transform var(--t-mid) var(--ease-spring), background var(--t-fast);
    z-index: 1;
}

.timeline-item:hover::before {
    transform: scale(1.24);
    background: var(--color-accent);
}

.timeline-date {
    display: inline-block;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--color-accent);
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
    margin-bottom: 4px;
}

.timeline-item p {
    color: var(--color-text-soft);
    font-size: 15px;
    line-height: 1.75;
}

.timeline-item strong { color: var(--color-text); font-weight: 650; }

/* --- 论文列表 --- */
.pub-list,
.pub-list-full {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.pub-item {
    position: relative;
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 22px 26px;
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.pub-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 20px;
    bottom: 20px;
    width: 3px;
    border-radius: var(--radius-pill);
    background: linear-gradient(180deg, var(--color-gradient-a), var(--color-gradient-c));
    opacity: 0.55;
    transition: opacity var(--t-mid) var(--ease-out), top var(--t-mid) var(--ease-out), bottom var(--t-mid) var(--ease-out);
}

.pub-item:hover {
    transform: translateX(3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.pub-item:hover::before { opacity: 1; top: 12px; bottom: 12px; }

.pub-venue {
    align-self: start;
    font-size: 12.5px;
    font-weight: 750;
    color: var(--color-primary);
    background: var(--color-accent-soft);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    text-align: center;
    line-height: 1.35;
    letter-spacing: 0.01em;
    word-break: break-word;
}

.pub-content { min-width: 0; }

.pub-title {
    font-size: 16.5px;
    font-weight: 650;
    color: var(--color-text);
    margin-bottom: 7px;
    line-height: 1.5;
}

.pub-authors {
    font-size: 14px;
    color: var(--color-text-soft);
    margin-bottom: 8px;
    line-height: 1.7;
}

.pub-authors strong { color: var(--color-text); font-weight: 700; }

.pub-desc,
.pub-summary {
    font-size: 14px;
    color: var(--color-text-mute);
    margin-bottom: 12px;
    line-height: 1.72;
}

.pub-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12.5px;
    font-weight: 650;
    color: var(--color-accent);
    padding: 4px 11px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    background: var(--color-bg-card);
    transition: all var(--t-fast) var(--ease-out);
}

.pub-link:hover {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
    transform: translateY(-1px);
}

.pub-count {
    font-size: 14px;
    color: var(--color-text-mute);
    font-weight: 400;
}

/* 论文年份分组 */
.pub-year-group { margin-bottom: 36px; }

.pub-year-group > h2,
.content-block > h2.pub-year {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* --- 博客列表 --- */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.post-item {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.post-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.post-meta {
    display: flex;
    gap: 10px 14px;
    align-items: center;
    flex-wrap: wrap;
    font-size: 12.5px;
    color: var(--color-text-mute);
    margin-bottom: 10px;
    font-weight: 550;
}

.post-meta time { font-family: var(--font-mono); letter-spacing: 0.02em; }

.post-category {
    display: inline-flex;
    align-items: center;
    background: var(--color-accent-soft);
    color: var(--color-accent);
    font-weight: 700;
    padding: 3px 11px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    letter-spacing: 0.02em;
}

.post-title {
    font-size: clamp(18px, 2vw, 21px);
    font-weight: 650;
    color: var(--color-text);
    margin-bottom: 9px;
    line-height: 1.42;
}

.post-title a {
    color: inherit;
    background-image: linear-gradient(currentColor, currentColor);
    background-size: 0% 1.5px;
    background-repeat: no-repeat;
    background-position: 0 100%;
    transition: background-size var(--t-mid) var(--ease-out), color var(--t-fast);
    padding-bottom: 2px;
}

.post-title a:hover {
    color: var(--color-primary);
    background-size: 100% 1.5px;
}

.post-excerpt {
    color: var(--color-text-soft);
    font-size: 14.5px;
    line-height: 1.78;
}

.read-time::before { content: "⏱ "; }

.post-item.is-draft,
.post-draft { opacity: 0.62; }

.post-item.is-draft:hover,
.post-draft:hover { opacity: 1; }

.post-item.is-draft .post-title a::after,
.post-draft .post-title a::after {
    content: var(--draft-label, "草稿");
    margin-left: 10px;
    font-size: 12px;
    font-weight: 700;
    color: var(--color-warn-fg);
    background: var(--color-warn-bg);
    padding: 2px 8px;
    border-radius: var(--radius-pill);
    vertical-align: middle;
    letter-spacing: 0;
}

html[lang="en"] { --draft-label: "Draft"; }

/* 分类过滤栏 */
.filter-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 26px;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--color-bg-card);
    color: var(--color-text-soft);
    border: 1px solid var(--color-border);
    padding: 7px 16px;
    border-radius: var(--radius-pill);
    font-family: inherit;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--t-fast) var(--ease-out);
}

.filter-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-accent);
    transform: translateY(-1px);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--color-gradient-a), var(--color-gradient-b));
    color: #fff;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .filter-btn.active { color: #0c1118; }

/* 空状态 */
.empty-state {
    padding: 48px 24px;
    text-align: center;
    color: var(--color-text-mute);
    border: 1px dashed var(--color-border-strong);
    border-radius: var(--radius-lg);
    background: var(--color-bg-alt);
}

/* 论文页的富空态：给访客「下一步看什么」，而不是一句冷冰冰的占位 */
.empty-state-rich {
    padding: 32px 28px;
    text-align: left;
    margin-bottom: 34px;
}

.empty-state-rich .empty-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.empty-state-rich .empty-body {
    font-size: 14.5px;
    line-height: 1.75;
    color: var(--color-text-soft);
    max-width: 62ch;
}

.fallback-heading {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
}

/* 方向卡片（论文页兜底 / 研究页复用同一视觉语言） */
.dir-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
    gap: 16px;
}

.dir-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 22px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.dir-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.dir-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 19px;
    line-height: 1;
    border-radius: var(--radius-sm);
    background: var(--color-accent-soft);
}

.dir-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.45;
}

.dir-desc {
    font-size: 14px;
    color: var(--color-text-soft);
    line-height: 1.72;
}

.dir-card .tags { margin-top: auto; }

/* ==========================================================================
   07 内页组件
   ========================================================================== */
/* --- 经历列表（教育 / 工作 / 研究） --- */
.exp-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.exp-list li {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    padding: 18px 0;
    border-bottom: 1px solid var(--color-border);
    transition: background var(--t-fast) var(--ease-out);
}

.exp-list li:last-child { border-bottom: 0; }

.exp-period {
    font-size: 13px;
    font-weight: 650;
    color: var(--color-accent);
    font-family: var(--font-mono);
    letter-spacing: 0.01em;
    padding-top: 3px;
}

.exp-body h3 {
    font-size: 17px;
    font-weight: 650;
    color: var(--color-text);
    margin-bottom: 6px;
    line-height: 1.45;
}

.exp-body p {
    font-size: 14.5px;
    color: var(--color-text-soft);
    line-height: 1.72;
    margin-bottom: 5px;
}

.exp-body p:last-child { margin-bottom: 0; }

/* --- 技能 --- */
.skill-group { margin-bottom: 22px; }

.skill-group h3 {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text-soft);
    margin-bottom: 11px;
    letter-spacing: 0.01em;
}

/* --- 列表（获奖 / 信息） --- */
.award-list,
.info-list {
    list-style: none;
}

.award-list li,
.info-list li {
    font-size: 15px;
    color: var(--color-text-soft);
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
    line-height: 1.75;
}

.award-list li:last-child,
.info-list li:last-child { border-bottom: 0; }

.info-list li strong {
    color: var(--color-text);
    display: inline-block;
    min-width: 104px;
    font-weight: 650;
}

/* --- 研究方向 --- */
.research-block {
    display: grid;
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 22px;
    padding: 26px;
    margin-bottom: 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.research-block:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.research-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 58px;
    height: 58px;
    font-size: 26px;
    line-height: 1;
    border-radius: var(--radius-md);
    background: var(--color-accent-soft);
}

.research-body h2 {
    font-size: 19px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 10px;
    border: 0;
    padding: 0;
}

.research-body p {
    font-size: 14.5px;
    color: var(--color-text-soft);
    line-height: 1.78;
    margin-bottom: 8px;
}

.research-body p:last-child { margin-bottom: 0; }

/* --- 项目卡片 --- */
.project-card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 26px 28px;
    margin-bottom: 18px;
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.project-header h2 {
    font-size: 19px;
    font-weight: 700;
    color: var(--color-text);
}

.project-status {
    font-size: 12px;
    font-weight: 750;
    padding: 4px 12px;
    border-radius: var(--radius-pill);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.status-active { background: var(--color-warn-bg); color: var(--color-warn-fg); }
.status-completed { background: var(--color-ok-bg); color: var(--color-ok-fg); }

.project-desc {
    color: var(--color-text-soft);
    font-size: 15px;
    line-height: 1.78;
    margin-bottom: 14px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-bottom: 14px;
}

/* 项目仓库的真实元信息（star / 主语言 / 许可证 / 最近更新） */
.repo-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px dashed var(--color-border);
}

.repo-chip {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    background: var(--color-bg-sunken);
    border: 1px solid var(--color-border);
    color: var(--color-text-soft);
    white-space: nowrap;
}

.repo-chip-star {
    background: var(--color-warn-bg);
    color: var(--color-warn-fg);
    border-color: transparent;
}

.repo-chip-lang {
    background: var(--color-accent-soft);
    color: var(--color-accent);
    border-color: transparent;
}

.repo-chip-archived {
    background: var(--color-bg-alt);
    color: var(--color-text-mute);
}

.repo-chip-updated { color: var(--color-text-mute); font-weight: 500; }

.repo-source-note {
    margin-top: 18px;
    font-size: 12.5px;
    color: var(--color-text-mute);
    line-height: 1.7;
}

.project-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* --- 首页精选项目（横向卡片，与项目页的纵向长卡区分开） --- */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
    gap: 18px;
    margin-bottom: 22px;
}

.project-tile {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 22px 24px;
    box-shadow: var(--shadow-xs);
    overflow: hidden;
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

/* 左侧渐变竖条：和论文卡片共用同一种视觉语言 */
.project-tile::before {
    content: "";
    position: absolute;
    left: 0;
    top: 22px;
    bottom: 22px;
    width: 3px;
    border-radius: var(--radius-pill);
    background: linear-gradient(180deg, var(--color-gradient-a), var(--color-gradient-c));
    opacity: 0.6;
    transition: opacity var(--t-mid) var(--ease-out),
                top var(--t-mid) var(--ease-out),
                bottom var(--t-mid) var(--ease-out);
}

.project-tile:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.project-tile:hover::before { opacity: 1; top: 14px; bottom: 14px; }

.project-tile-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.project-tile-title {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.project-tile-title a {
    color: inherit;
    background-image: linear-gradient(currentColor, currentColor);
    background-size: 0% 1.5px;
    background-repeat: no-repeat;
    background-position: 0 100%;
    padding-bottom: 2px;
    transition: background-size var(--t-mid) var(--ease-out), color var(--t-fast);
}

.project-tile-title a:hover {
    color: var(--color-primary);
    background-size: 100% 1.5px;
}

.project-tile-desc {
    font-size: 14.5px;
    color: var(--color-text-soft);
    line-height: 1.75;
    /* 首页卡片等高：描述最多 4 行 */
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-tile .project-tech { margin-bottom: 0; }
.project-tile .project-links { margin-top: auto; }

.project-see-all { align-self: flex-start; }

.cv-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

/* --- 分享 / 书单 / 爱好列表 --- */
.entry-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.entry-item {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out);
}

.entry-item:hover {
    transform: translateX(3px);
    box-shadow: var(--shadow-md);
}

.entry-title {
    font-size: 16.5px;
    font-weight: 650;
    color: var(--color-text);
    margin-bottom: 5px;
    line-height: 1.5;
}

.entry-meta {
    font-size: 12.5px;
    color: var(--color-text-mute);
    margin-bottom: 9px;
    font-family: var(--font-mono);
    letter-spacing: 0.01em;
}

.entry-desc {
    color: var(--color-text-soft);
    font-size: 14.5px;
    line-height: 1.75;
}

.entry-links {
    margin-top: 12px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* 书单 */
.book-group { margin-bottom: 40px; }

.book-group > h2 {
    font-size: 19px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.book-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
    gap: 14px;
}

.book-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.book-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.book-title {
    font-size: 15px;
    font-weight: 650;
    color: var(--color-text);
    line-height: 1.45;
}

.book-author {
    font-size: 12.5px;
    color: var(--color-text-mute);
    display: block;
    margin: 3px 0 6px;
}

.book-rating {
    color: var(--color-star);
    font-size: 13px;
    letter-spacing: 1px;
}

/* 星标是纯装饰：用 aria-hidden 隐藏，但非文本对比度也更低，
   深色模式下换成更亮的金色以保证可见性 */
[data-theme="dark"] .book-rating { color: #fbbf24; }

.book-comment {
    font-size: 13px;
    color: var(--color-text-soft);
    line-height: 1.68;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--color-border);
}

/* 爱好 */
.hobby-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 210px), 1fr));
    gap: 16px;
}

.hobby-card {
    position: relative;
    overflow: hidden;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 26px 22px;
    text-align: center;
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.hobby-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.hobby-card::before {
    content: "";
    position: absolute;
    inset: -40% 20% auto 20%;
    height: 80%;
    border-radius: 50%;
    background: radial-gradient(circle, var(--color-accent-soft), transparent 70%);
    opacity: 0;
    transition: opacity var(--t-mid) var(--ease-out);
}

.hobby-card:hover::before { opacity: 1; }

.hobby-icon {
    font-size: 38px;
    margin-bottom: 12px;
    line-height: 1;
    display: block;
    transition: transform var(--t-mid) var(--ease-spring);
}

.hobby-card:hover .hobby-icon { transform: scale(1.12) rotate(-4deg); }

.hobby-name {
    font-size: 16px;
    font-weight: 650;
    color: var(--color-text);
    margin-bottom: 6px;
}

.hobby-desc {
    font-size: 13.5px;
    color: var(--color-text-soft);
    line-height: 1.68;
}

/* --- 404 --- */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--header-height) - 140px);
    text-align: center;
    padding: 40px 0;
}

.error-content { width: 100%; }

.error-code {
    font-size: clamp(72px, 14vw, 132px);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.04em;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--color-gradient-a), var(--color-gradient-c));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.error-title {
    font-size: clamp(22px, 3vw, 30px);
    font-weight: 700;
    margin-bottom: 14px;
}

.error-desc {
    color: var(--color-text-soft);
    margin-bottom: 32px;
    line-height: 1.8;
    font-size: 16px;
}

.error-cta {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 52px;
}

.error-suggestions h3 {
    font-size: 12px;
    font-weight: 700;
    color: var(--color-text-mute);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    margin-bottom: 18px;
}

.suggestion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr));
    gap: 12px;
}

.suggestion-item {
    display: block;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px 16px;
    text-align: center;
    color: var(--color-text);
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.suggestion-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: var(--color-accent);
    color: var(--color-text);
}

.suggestion-icon { font-size: 26px; margin-bottom: 9px; line-height: 1; }

.suggestion-title {
    font-size: 14.5px;
    font-weight: 650;
    margin-bottom: 4px;
    color: var(--color-primary);
}

.suggestion-desc {
    font-size: 12px;
    color: var(--color-text-mute);
    line-height: 1.5;
}

/* --- 面包屑 --- */
.breadcrumb {
    font-size: 13px;
    color: var(--color-text-mute);
    margin-bottom: 18px;
}

.breadcrumb a {
    color: var(--color-text-mute);
    /* 窄屏下面包屑链接只有 17px 高，撑到 24px 以上以满足触摸目标要求 */
    display: inline-block;
    padding: 4px 0;
    min-height: 24px;
}
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb-sep { margin: 0 7px; opacity: 0.6; }

/* ==========================================================================
   08 文章页 / 搜索 / 交互层
   ========================================================================== */
/* --- 文章头 --- */
.post-header,
.article-header {
    position: relative;
    text-align: center;
    padding: clamp(24px, 4vw, 40px) 0 clamp(20px, 3vw, 30px);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: clamp(28px, 4vw, 40px);
}

.post-header .post-meta,
.article-header .post-meta {
    justify-content: center;
    margin-bottom: 16px;
}

.post-header h1,
.article-header h1 {
    font-size: clamp(23px, 3.6vw, 38px);
    font-weight: 750;
    line-height: 1.3;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: 12px;
    overflow-wrap: anywhere;
}

.post-header .post-excerpt,
.article-header .post-excerpt {
    max-width: 62ch;
    margin: 0 auto;
    font-size: 16px;
}

/* --- 正文 --- */
.post-content,
.article-content {
    font-size: 16.5px;
    line-height: 1.9;
    color: var(--color-text);
}

.post-content > * + *,
.article-content > * + * { margin-top: 20px; }

.post-content h2,
.article-content h2 {
    font-size: clamp(21px, 2.6vw, 26px);
    font-weight: 700;
    margin: 44px 0 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
    scroll-margin-top: calc(var(--header-height) + 20px);
}

.post-content h3,
.article-content h3 {
    font-size: clamp(18px, 2vw, 20px);
    font-weight: 650;
    margin: 34px 0 12px;
    color: var(--color-text);
    scroll-margin-top: calc(var(--header-height) + 20px);
}

.post-content p,
.article-content p { color: var(--color-text-soft); }

.post-content ul,
.post-content ol,
.article-content ul,
.article-content ol {
    padding-left: 22px;
    color: var(--color-text-soft);
}

.post-content li,
.article-content li { margin-bottom: 9px; }

.post-content li::marker,
.article-content li::marker { color: var(--color-accent); }

.post-content a,
.article-content a {
    font-weight: 550;
    background-image: linear-gradient(currentColor, currentColor);
    background-size: 100% 1px;
    background-repeat: no-repeat;
    background-position: 0 100%;
    transition: background-size var(--t-fast), color var(--t-fast);
}

.post-content a:hover,
.article-content a:hover { background-size: 100% 2px; }

.post-content blockquote,
.article-content blockquote {
    margin: 26px 0;
    padding: 16px 24px;
    border-left: 4px solid var(--color-accent);
    background: var(--color-bg-alt);
    color: var(--color-text-soft);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
}

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

.post-content img,
.article-content img {
    border-radius: var(--radius-md);
    margin: 26px 0;
    box-shadow: var(--shadow-md);
}

/* 可放大的文章配图：给出「能点」的视觉提示 */
.post-content img.zoomable,
.article-content img.zoomable {
    cursor: zoom-in;
    transition: transform var(--t-mid) var(--ease-out), box-shadow var(--t-mid) var(--ease-out);
}

.post-content img.zoomable:hover,
.article-content img.zoomable:hover {
    transform: scale(1.012);
    box-shadow: var(--shadow-lg);
}

/* 图文块：配图 + 图注 */
.post-figure,
.article-figure {
    margin: 30px 0;
}

.post-figure img,
.article-figure img {
    margin: 0;

    /* 示意图这类矢量配图不需要投影，避免看起来像浮起来 */
    box-shadow: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-alt);
}

.post-figure figcaption,
.article-figure figcaption {
    margin-top: 10px;
    font-size: 13px;
    color: var(--color-text-mute);
    text-align: center;
    line-height: 1.6;
}

/* 图片灯箱 */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1100;
    display: none;
    align-items: center;
    justify-content: center;
    padding: clamp(16px, 4vw, 48px);
    background: rgba(9, 14, 22, 0.88);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    cursor: zoom-out;
}

.lightbox.is-open {
    display: flex;
    animation: overlay-in var(--t-mid) var(--ease-out);
}

.lightbox img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    margin: 0;
    border-radius: var(--radius-md);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
    cursor: default;
}

.lightbox-close {
    position: absolute;
    top: clamp(12px, 3vw, 24px);
    right: clamp(12px, 3vw, 24px);
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    transition: background var(--t-fast), transform var(--t-fast);
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.24);
    transform: scale(1.06);
}

@media print {
    .lightbox { display: none !important; }
}

.post-content hr,
.article-content hr { margin: 36px 0; }

/* 标题锚点 */
.heading-anchor {
    margin-left: 10px;
    color: var(--color-text-mute);
    opacity: 0;
    font-weight: 500;
    font-size: 0.72em;
    vertical-align: middle;
    transition: opacity var(--t-fast) var(--ease-out), color var(--t-fast);
    background: none !important;
}

.post-content h2:hover .heading-anchor,
.post-content h3:hover .heading-anchor,
.article-content h2:hover .heading-anchor,
.article-content h3:hover .heading-anchor { opacity: 0.85; }

.heading-anchor:hover { color: var(--color-accent); }

/* 代码块 */
.post-content pre,
.article-content pre {
    position: relative;
    background: #10161f;
    color: #e6edf6;
    padding: 40px 20px 18px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.68;
    border: 1px solid rgba(255, 255, 255, 0.07);
    box-shadow: var(--shadow-sm);
}

.post-content pre code,
.article-content pre code {
    background: transparent;
    border: 0;
    padding: 0;
    color: inherit;
    font-size: 0.92em;
}

/* 窄屏横向滚动的可见提示：右侧渐隐，并且只在真的溢出时出现。
   pre 由 JS 加了 tabindex，:focus-visible 时也给个焦点环。 */
.post-content pre:focus-visible,
.article-content pre:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

@media (max-width: 720px) {
    .post-content pre,
    .article-content pre {
        /* 渐隐提示「右边还有内容」 */
        background-image: linear-gradient(to left, rgba(255, 255, 255, 0.14), transparent 42px);
        background-repeat: no-repeat;
        background-position: right;
        background-size: 42px 100%;
        -webkit-overflow-scrolling: touch;
        overscroll-behavior-x: contain;
    }
}

.code-lang {
    position: absolute;
    top: 0;
    left: 0;
    padding: 5px 12px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(230, 237, 246, 0.6);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md) 0 var(--radius-sm) 0;
    pointer-events: none;
    user-select: none;
}

.code-copy {
    position: absolute;
    top: 8px;
    right: 8px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 11px;
    font-family: inherit;
    font-size: 12px;
    font-weight: 600;
    color: #e6edf6;
    background: rgba(255, 255, 255, 0.09);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: var(--radius-pill);
    cursor: pointer;
    opacity: 0;
    transform: translateY(-2px);
    transition: opacity var(--t-fast) var(--ease-out),
                transform var(--t-fast) var(--ease-out),
                background var(--t-fast);
    z-index: 2;
}

.post-content pre:hover .code-copy,
.article-content pre:hover .code-copy,
.code-copy:focus-visible {
    opacity: 1;
    transform: translateY(0);
}

.code-copy:hover { background: rgba(255, 255, 255, 0.2); }

.code-copy.is-copied {
    color: #34d399;
    border-color: rgba(52, 211, 153, 0.5);
    opacity: 1;
    transform: translateY(0);
}

[data-theme="dark"] .post-content pre,
[data-theme="dark"] .article-content pre {
    background: #0b1017;
    border-color: var(--color-border);
}

/* KaTeX */
.post-content .katex-display,
.article-content .katex-display {
    overflow-x: auto;
    padding: 10px 0;
}

/* 表格 */
.post-content table,
.article-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14.5px;
    margin: 24px 0;
    display: block;
    overflow-x: auto;
}

.post-content th,
.post-content td,
.article-content th,
.article-content td {
    border: 1px solid var(--color-border);
    padding: 10px 14px;
    text-align: left;
}

.post-content th,
.article-content th {
    background: var(--color-bg-alt);
    font-weight: 650;
    color: var(--color-text);
}

/* --- 左侧目录（TOC）--- */
.toc {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    margin-bottom: 32px;
    font-size: 14px;
}

.toc.is-sticky {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    margin-bottom: 0;
    max-height: calc(100vh - var(--header-height) - 56px);
    overflow-y: auto;
}

.toc-title {
    font-size: 12px;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-text-mute);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.toc-title::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.toc-list,
.toc-sublist {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.toc-sublist {
    padding-left: 14px;
    margin-top: 2px;
    border-left: 1px solid var(--color-border);
}

.toc-item { margin: 3px 0; }

.toc-item a {
    position: relative;
    display: block;
    padding: 5px 8px 5px 12px;
    color: var(--color-text-soft);
    font-size: 13.5px;
    line-height: 1.5;
    border-radius: var(--radius-xs);
    transition: all var(--t-fast) var(--ease-out);
}

.toc-item a::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 3px;
    height: 0;
    border-radius: var(--radius-pill);
    background: var(--color-accent);
    transform: translateY(-50%);
    transition: height var(--t-fast) var(--ease-out);
}

.toc-item a:hover {
    color: var(--color-primary);
    background: var(--color-bg-card);
}

.toc-item a.is-active {
    color: var(--color-primary);
    background: var(--color-bg-card);
    font-weight: 600;
}

.toc-item a.is-active::before { height: 60%; }

.toc-item.toc-h3 a {
    font-size: 12.5px;
    color: var(--color-text-mute);
    padding-left: 12px;
}

.toc-item.toc-h3 a.is-active { color: var(--color-primary); }

/* --- 文章页双栏布局 --- */
.article-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
}

/* --- 文章壳：宽屏左侧粘性目录 + 右侧正文 --- */
.article-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(24px, 4vw, 44px);
    align-items: start;
}

.article-main { min-width: 0; }

.giscus-note { display: none; }

/* 目录在移动端折叠成普通卡片（放在正文之前） */
.article-shell .toc { margin-bottom: 28px; }

@media (min-width: 1000px) {
    .article-shell {
        grid-template-columns: 216px minmax(0, 1fr);
    }

    .article-shell .toc {
        order: -1;
        margin-bottom: 0;
    }

    .article-side { min-width: 0; }
}

/* --- 分享 / 快捷键提示 --- */
.article-tools {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin: 32px 0 0;
}

.article-share {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-soft);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--t-fast) var(--ease-out);
}

.share-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-xs);
}

.share-btn.is-done {
    color: var(--color-ok-fg);
    border-color: var(--color-ok-fg);
    background: var(--color-ok-bg);
}

.article-hint {
    font-size: 12px;
    color: var(--color-text-mute);
    margin-left: auto;
}

/* --- 上一篇 / 下一篇 --- */
.article-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
    gap: 14px;
    margin-top: 40px;
}

.article-nav-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 18px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    transition: transform var(--t-mid) var(--ease-out),
                box-shadow var(--t-mid) var(--ease-out),
                border-color var(--t-mid) var(--ease-out);
}

.article-nav-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.article-nav-label {
    font-size: 12px;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-accent);
}

.article-nav-title {
    font-size: 15px;
    font-weight: 650;
    color: var(--color-text);
    line-height: 1.5;
}

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

.article-nav-date {
    font-size: 12px;
    color: var(--color-text-mute);
    font-family: var(--font-mono);
}

.article-nav-next { text-align: right; }
.article-nav-next .article-nav-title { align-self: flex-end; }

/* 只有一篇相邻文章时占满整行（避免半宽卡片看起来像缺了一半） */
.article-nav-card:only-child { grid-column: 1 / -1; }

/* 宽屏时文章正文更宽，阅读更从容 */
@media (min-width: 1000px) {
    .container.article-wide { max-width: 1040px; }
}

/* --- 文章底部 --- */
.post-footer,
.article-footer {
    margin-top: 52px;
    padding-top: 26px;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-mute);
    font-size: 14px;
}

.post-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 24px;
    color: var(--color-accent);
    font-size: 14px;
    font-weight: 600;
    transition: transform var(--t-fast) var(--ease-out);
}

.post-back:hover { transform: translateX(-3px); }

.comments-section {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

/* --- 搜索 --- */
.search-trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px 7px 14px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    color: var(--color-text-mute);
    font-family: inherit;
    font-size: 13px;
    cursor: pointer;
    transition: all var(--t-fast) var(--ease-out);
    margin-right: 4px;
}

.search-trigger:hover {
    border-color: var(--color-accent);
    color: var(--color-primary);
}

.search-trigger kbd {
    font-family: var(--font-mono);
    font-size: 12px;
    padding: 2px 6px;
    background: var(--color-bg-sunken);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xs);
    color: var(--color-text-mute);
}

.search-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-overlay);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1000;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: clamp(60px, 12vh, 120px) 20px 20px;
}

.search-overlay.open {
    display: flex;
    animation: overlay-in var(--t-mid) var(--ease-out);
}

@keyframes overlay-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.search-modal {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 620px;
    max-height: min(70vh, 620px);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: modal-in 0.3s var(--ease-spring);
}

@keyframes modal-in {
    from { opacity: 0; transform: translateY(-14px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.search-input-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    border-bottom: 1px solid var(--color-border);
}

.search-input {
    flex: 1;
    min-width: 0;
    border: 0;
    background: transparent;
    font-family: inherit;
    font-size: 16.5px;
    color: var(--color-text);
    outline: none;
}

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

.search-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-mute);
    font-size: 17px;
    line-height: 1;
    cursor: pointer;
    transition: all var(--t-fast) var(--ease-out);
}

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

.search-results {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    overscroll-behavior: contain;
}

.search-empty {
    padding: 44px 20px;
    text-align: center;
    color: var(--color-text-mute);
    font-size: 14px;
    line-height: 1.8;
}

.search-result {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    color: var(--color-text);
    border: 1px solid transparent;
    transition: background var(--t-fast) var(--ease-out),
                border-color var(--t-fast) var(--ease-out);
}

.search-result:hover,
.search-result.focused {
    background: var(--color-bg-alt);
    border-color: var(--color-border);
    color: var(--color-text);
}

/* 结果分组：类型标题 + 数量 */
.search-group + .search-group {
    margin-top: 6px;
    padding-top: 6px;
    border-top: 1px dashed var(--color-border);
}

.search-group-title {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px 4px;
    font-size: 12px;
    font-weight: 750;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-mute);
}

.search-group-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: var(--radius-pill);
    background: var(--color-bg-sunken);
    color: var(--color-text-mute);
    font-size: 12px;
    letter-spacing: 0;
}

.search-result-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 4px;
}

/* 每条结果的类型标签 */
.search-type {
    flex: none;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    padding: 2px 8px;
    border-radius: var(--radius-pill);
    background: var(--color-accent-soft);
    color: var(--color-accent);
    white-space: nowrap;
}

.search-result-title {
    font-weight: 650;
    font-size: 14.5px;
    color: var(--color-primary);
    margin-bottom: 0;
    min-width: 0;
}

.search-result-excerpt {
    font-size: 13px;
    color: var(--color-text-soft);
    line-height: 1.6;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.search-result mark {
    background: var(--color-accent-soft);
    color: var(--color-accent);
    padding: 0 2px;
    border-radius: 3px;
    font-weight: 650;
}

.search-footer {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 18px;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-alt);
    font-size: 12px;
    color: var(--color-text-mute);
}

.search-footer kbd {
    font-family: var(--font-mono);
    font-size: 12px;
    padding: 1px 5px;
    margin-right: 3px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
}

.search-count { margin-left: auto; }

/* --- 回到顶部 --- */
.back-to-top {
    position: fixed;
    right: clamp(16px, 3vw, 28px);
    bottom: clamp(16px, 3vw, 28px);
    width: 46px;
    height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-gradient-a), var(--color-gradient-b));
    color: #fff;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(14px) scale(0.9);
    transition: opacity var(--t-mid) var(--ease-out),
                transform var(--t-mid) var(--ease-spring),
                visibility var(--t-mid),
                box-shadow var(--t-mid) var(--ease-out);
    z-index: 120;
}

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

.back-to-top:hover {
    color: #fff;
    box-shadow: var(--shadow-glow);
    transform: translateY(-3px) scale(1.04);
}

/* --- 阅读进度（文章页） --- */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 100%;
    transform: scaleX(var(--progress, 0));
    transform-origin: 0 50%;
    background: linear-gradient(90deg, var(--color-gradient-a), var(--color-gradient-c));
    z-index: 200;
    pointer-events: none;
}

/* --- 页脚 --- */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 34px 0 38px;
    color: var(--color-text-mute);
    font-size: 13.5px;
    background: var(--color-bg-alt);
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 4px;
    margin-bottom: 20px;
}

.footer-nav a {
    padding: 5px 12px;
    border-radius: var(--radius-pill);
    color: var(--color-text-soft);
    font-weight: 550;
    text-decoration: none;
    transition: all var(--t-fast) var(--ease-out);
}

.footer-nav a:hover {
    color: var(--color-primary);
    background: var(--color-bg-card);
}

.footer-bottom p {
    margin-bottom: 6px;
    text-align: center;
}

.footer-bottom {
    padding-top: 18px;
    border-top: 1px solid var(--color-border);
}

.site-footer a {
    color: var(--color-text-soft);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
}

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

.site-footer .footer-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

/* ==========================================================================
   09 滚动渐入
   ========================================================================== */
/* 禁用脚本时的提示（内容由 JS 渲染，骨架还在） */
.noscript-note {
    margin: 0;
    padding: 14px 20px;
    background: var(--color-warn-bg);
    color: var(--color-warn-fg);
    font-size: 14px;
    line-height: 1.7;
    border-bottom: 1px solid var(--color-border);
    text-align: center;
}

.noscript-note a {
    color: inherit;
    font-weight: 650;
    text-decoration: underline;
}

/* 404 页：用 URL 里的关键词直接搜索 */
.error-search {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin: 22px 0 6px;
    padding: 18px 20px;
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-alt);
}

.error-search[hidden] { display: none; }

.error-search-hint {
    font-size: 14px;
    color: var(--color-text-soft);
    text-align: center;
    word-break: break-word;
}

.error-search-hint::before {
    content: "🔍 ";
    margin-right: 2px;
}

/* 相关文章：把主题页与已发布文章连起来（页面上内容少时的继续阅读路径） */
.related-section {
    margin-top: clamp(36px, 6vw, 64px);
    padding-top: clamp(24px, 4vw, 36px);
    border-top: 1px solid var(--color-border);
}

.related-section-title {
    font-size: clamp(17px, 1.6vw, 20px);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 18px;
}

.related-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.related-post {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 18px 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-card);
    transition: transform var(--t-fast) var(--ease-out),
                box-shadow var(--t-fast) var(--ease-out),
                border-color var(--t-fast) var(--ease-out);
}

.related-post:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

.related-post-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12.5px;
    color: var(--color-text-mute);
}

.related-post-cat {
    padding: 1px 8px;
    border-radius: var(--radius-pill);
    background: var(--color-accent-soft);
    color: var(--color-accent);
    font-weight: 650;
}

.related-post-title {
    font-size: 16px;
    font-weight: 680;
    line-height: 1.45;
    color: var(--color-primary);
    margin: 0;
}

.related-post-excerpt {
    font-size: 13.5px;
    line-height: 1.65;
    color: var(--color-text-soft);
    margin: 0;
}

.related-post-read {
    margin-top: auto;
    padding-top: 8px;
    font-size: 13px;
    font-weight: 650;
    color: var(--color-accent);
}

/* 滚动渐入：只在脚本可用时隐藏内容。
   `html.js` 由各页 head 里的内联脚本添加；禁用脚本时内容直接显示，
   不会因为 .is-visible 永不被添加而整页空白。 */
html.js .reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity var(--t-slow) var(--ease-out),
                transform var(--t-slow) var(--ease-out);
    transition-delay: var(--reveal-delay, 0s);
    will-change: opacity, transform;
}

html.js .reveal.is-visible {
    opacity: 1;
    transform: none;
}

html.js .reveal.reveal-left { transform: translateX(-22px); }
html.js .reveal.reveal-scale { transform: scale(0.97); }

/* ==========================================================================
   10 响应式
   ========================================================================== */
@media (max-width: 1024px) {
    .site-nav { gap: 0; }
    .nav-link { padding: 8px 11px; font-size: 14.5px; }
}

@media (max-width: 900px) {
    /* 桌面导航收进抽屉 */
    .nav-toggle { display: flex; }

    .site-nav {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        margin: 0;
        padding: 14px var(--gutter) 22px;
        background: var(--color-bg-elevated);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: opacity var(--t-mid) var(--ease-out),
                    transform var(--t-mid) var(--ease-out),
                    visibility var(--t-mid);
    }

    .site-nav.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-link {
        padding: 12px 14px;
        font-size: 15.5px;
        border-radius: var(--radius-sm);
    }

    .nav-link.active::after { display: none; }

    /* 二级导航在抽屉里直接铺开 */
    .nav-more { display: none; }
    .nav-mobile-extra { display: block; }

    .nav-mobile-extra details {
        border-top: 1px solid var(--color-border);
        margin-top: 6px;
        padding-top: 6px;
    }

    .nav-mobile-extra summary {
        padding: 12px 14px;
        font-size: 15.5px;
        font-weight: 550;
        color: var(--color-text-soft);
        cursor: pointer;
        list-style: none;
        border-radius: var(--radius-sm);
    }

    .nav-mobile-extra summary::-webkit-details-marker { display: none; }

    .nav-mobile-extra .nav-subgroup {
        display: flex;
        flex-direction: column;
        padding-left: 8px;
    }

    .nav-mobile-extra .nav-subgroup a {
        padding: 10px 14px;
        border-radius: var(--radius-sm);
        color: var(--color-text-soft);
        font-size: 15px;
    }

    .nav-mobile-extra .nav-subgroup a.active {
        color: var(--color-accent);
        background: var(--color-accent-soft);
    }

    .hero-inner {
        grid-template-columns: minmax(0, 1fr);
        text-align: center;
        gap: 34px;
    }

    .hero-avatar { order: -1; margin: 0 auto; }
    .hero-subtitle { margin-left: auto; margin-right: auto; }
    .hero-cta, .hero-meta { justify-content: center; }
    .hero-meta { border-top-style: solid; }

    .exp-list li { grid-template-columns: minmax(0, 1fr); gap: 6px; }
    .research-block { grid-template-columns: 48px minmax(0, 1fr); gap: 16px; padding: 22px; }
    .research-icon { width: 48px; height: 48px; font-size: 22px; }

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

@media (max-width: 720px) {
    :root { --header-height: 60px; }

    .brand-text { font-size: 16px; }

    .pub-item {
        grid-template-columns: minmax(0, 1fr);
        gap: 14px;
        padding: 20px;
    }

    .pub-item::before { display: none; }

    .pub-venue { justify-self: start; }

    .post-item { padding: 20px; }

    .stats-row { grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr)); }

    .github-chart img { min-width: 0; }

    .info-list li strong { min-width: 84px; }

    .section-head { align-items: flex-start; }
}

@media (max-width: 520px) {
    .container { padding: 0 16px; }

    .hero-title { font-size: clamp(26px, 8vw, 32px); }

    .hero-cta { flex-direction: column; }
    .hero-cta .btn { width: 100%; }

    .hero-meta { gap: 8px 14px; font-size: 13.5px; }

    /* 窄屏统计卡改成两列：图标过大 + 单列会把「数字」挤成半屏滚动 */
    .stats-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .stat-card { flex-direction: column; align-items: flex-start; gap: 8px; padding: 14px; }
    .stat-icon { width: 36px; height: 36px; font-size: 17px; }
    .stat-label { font-size: 12px; letter-spacing: 0.03em; }
    .stat-value { font-size: 20px; }

    .search-overlay { padding: 20px 12px; align-items: flex-start; }
    .search-modal { max-height: 84vh; }

    .nav-lang-group { display: none; }
    .nav-mobile-extra .lang-row { display: flex; }

    .book-list, .hobby-grid, .info-grid { grid-template-columns: minmax(0, 1fr); }

    .back-to-top { width: 42px; height: 42px; }
}

/* 抽屉里的语言切换行（移动端使用） */
.nav-mobile-extra .lang-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 10px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
}

.nav-mobile-extra .lang-row a {
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    font-size: 13.5px;
    font-weight: 650;
    color: var(--color-text-soft);
    border: 1px solid transparent;
    transition: all var(--t-fast) var(--ease-out);
}

.nav-mobile-extra .lang-row a:hover {
    color: var(--color-primary);
    background: var(--color-bg-sunken);
}

.nav-mobile-extra .lang-row a.active {
    color: #fff;
    background: linear-gradient(135deg, var(--color-gradient-a), var(--color-gradient-b));
    border-color: transparent;
}

[data-theme="dark"] .nav-mobile-extra .lang-row a.active { color: #0c1118; }

/* 桌面端隐藏抽屉里的语言行（用工具栏的语言按钮） */
@media (min-width: 901px) {
    .nav-mobile-extra .lang-row { display: none; }
}

/* ==========================================================================
   11 无障碍与打印
   ========================================================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 键盘用户跳过动画 */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }

    .hero-text > *,
    .hero-avatar {
        animation: none;
    }
}

@media print {
    :root,
    [data-theme="dark"] {
        --color-bg: #fff;
        --color-bg-alt: #fff;
        --color-bg-card: #fff;
        --color-bg-elevated: #fff;
        --color-bg-sunken: #fff;
        --color-text: #000;
        --color-text-soft: #222;
        --color-text-mute: #444;
        --color-border: #ccc;
        --color-border-strong: #999;
        --color-primary: #1e3a5f;
        --color-accent: #1e3a5f;
        --shadow-xs: none;
        --shadow-sm: none;
        --shadow-md: none;
        --shadow-lg: none;
        --shadow-glow: none;
    }

    @page { margin: 16mm 14mm; }

    body {
        font-size: 10.5pt;
        line-height: 1.5;
        background: #fff;
    }

    .site-header,
    .site-footer,
    .back-to-top,
    .skip-link,
    .cv-actions,
    .nav-actions,
    .code-copy,
    .code-lang,
    .scroll-progress,
    .reading-progress,
    .toc,
    .filter-bar,
    .search-overlay,
    .heading-anchor,
    .timeline::before,
    .hero::before,
    .hero::after {
        display: none !important;
    }

    .container,
    .container.narrow {
        max-width: 100%;
        padding: 0;
    }

    .page-main { padding: 0; min-height: 0; }

    /* 段落不要孤立行，减少「一页只落下几行」的情况 */
    p, li { orphans: 3; widows: 3; }

    .section,
    .section-alt {
        padding: 0 0 10pt;
        background: #fff;
        border: 0;
    }

    .page-title {
        font-size: 20pt;
        border-bottom: 2px solid #000;
        padding-bottom: 4pt;
        margin-bottom: 10pt;
    }

    .page-title::after { display: none; }

    .content-block { margin-bottom: 14pt; page-break-inside: auto; }

    .content-block > h2 {
        font-size: 13pt;
        margin-top: 12pt;
        margin-bottom: 5pt;
        border-bottom: 1px solid #999;
        page-break-after: avoid;
    }

    .exp-list li,
    .award-list li,
    .info-list li,
    .entry-item,
    .pub-item {
        page-break-inside: avoid;
        box-shadow: none;
    }

    .pub-item,
    .card,
    .info-card,
    .project-card,
    .entry-item,
    .book-item {
        border: 1px solid #ddd;
        box-shadow: none;
        transform: none;
    }

    a { color: #000; text-decoration: none; }

    a[href^="http"]::after,
    a[href^="mailto"]::after {
        content: " (" attr(href) ")";
        font-size: 8pt;
        color: #555;
    }

    .reveal { opacity: 1 !important; transform: none !important; }

    /* --- 简历页：目标是「一页装完」，装不下就两页，但不为了塞进一页把字号压到看不清 --- */
    /* 类名以 cv.html + cv-renderer.js 实际产出的结构为准 */
    .cv-actions { display: none !important; }

    .content-block {
        margin-bottom: 3pt !important;
        page-break-inside: auto;
    }

    .content-block > h2 {
        font-size: 10.5pt !important;
        margin: 3.5pt 0 1.5pt !important;
        padding-bottom: 0 !important;
        page-break-after: avoid;
    }

    .info-list li {
        font-size: 8.5pt !important;
        line-height: 1.3 !important;
        margin-bottom: 0 !important;
    }

    /* 基本信息在纸上是 6 行「标签 + 值」，横向还有大量空白。
       排成两列可省下约 5 行高度，让简历落在 1~2 页且末页不空。 */
    .info-list {
        display: grid !important;
        grid-template-columns: 1fr 1fr !important;
        column-gap: 18pt !important;
        row-gap: 0 !important;
        margin: 0 !important;
        padding: 0 !important;
        list-style: none !important;
    }

    .exp-list,
    .award-list {
        margin: 0 !important;
        padding: 0 !important;
        list-style: none !important;
    }

    .exp-list li {
        margin-bottom: 3pt !important;
        page-break-inside: avoid;
    }

    .exp-period {
        font-size: 7.5pt !important;
        margin-bottom: 0 !important;
    }

    .exp-body h3 {
        font-size: 9pt !important;
        margin: 0 !important;
    }

    .exp-body p {
        font-size: 8pt !important;
        line-height: 1.32 !important;
        margin: 0 !important;
    }

    /* 技能清单在纸上用内联排列：三组技能从「多行胶囊」压成三行文字，
       省下的纵向空间正好让简历落在一页内，同时保持可读字号 */
    .content-block[data-cv-section="skills"] > div,
    .content-block[data-cv-section="skills"] > p {
        margin: 0 0 0.5pt !important;
        font-size: 8pt !important;
        line-height: 1.35 !important;
    }

    .content-block[data-cv-section="skills"] ul {
        display: inline !important;
        margin: 0 !important;
        padding: 0 !important;
        list-style: none !important;
    }

    .content-block[data-cv-section="skills"] li {
        display: inline !important;
        margin: 0 !important;
    }

    .content-block[data-cv-section="skills"] li + li::before { content: "、"; }
    .content-block[data-cv-section="skills"] .tag,
    .content-block[data-cv-section="skills"] .skill-tag {
        border: 0 !important;
        padding: 0 !important;
        background: transparent !important;
        font-size: 8pt !important;
    }

    /* 基本信息两列：数据本身较短，改成三列能再省一行，把简历真正压进一页 */
    .info-list { grid-template-columns: 1fr 1fr 1fr !important; }
    .info-list li { font-size: 8pt !important; }

    .tag,
    .skill-tag {
        font-size: 8pt !important;
        padding: 1pt 4pt !important;
        border: 1px solid #bbb !important;
        background: #fff !important;
        color: #000 !important;
    }

    /* 简历页头部收紧（屏幕端为了观感留了较大间距） */
    .page-title {
        font-size: 16pt !important;
        margin-bottom: 4pt !important;
        padding-bottom: 2pt !important;
    }

    @page { margin: 12mm 13mm; }

    /* --- 代码块：屏幕上深底，打印时必须改浅底 --- */
    /* 深色底在黑白打印机下会糊成一片，而且非常费墨 */
    .post-content pre,
    .article-content pre {
        background: #f7f8fa !important;
        color: #111 !important;
        border: 1px solid #ccc !important;
        box-shadow: none !important;
        font-size: 8pt !important;
        line-height: 1.45 !important;
        padding: 8pt 10pt !important;
        white-space: pre-wrap !important;   /* 纸上没有横向滚动，必须换行 */
        word-break: break-word !important;
        overflow: visible !important;
        page-break-inside: avoid;
    }

    /* 语法高亮的颜色是给深底配的（浅色前景），浅底上会看不清，统一改深色 */
    .post-content pre code,
    .article-content pre code,
    .post-content pre code *,
    .article-content pre code *,
    .post-content pre .hljs,
    .article-content pre .hljs,
    .post-content pre .hljs * ,
    .article-content pre .hljs * {
        color: #111 !important;
        background: transparent !important;
    }
}