/* ==========================================================================
   拾光集 · 个人博客样式表
   设计原则：极简阅读风 —— 大量留白、衬线标题、克制的强调色、以内容为唯一主角。
   结构：1 设计令牌 / 2 基础排版 / 3 布局框架 / 4 通用组件 / 5 视图样式
        / 6 正文排版(Prose) / 7 搜索浮层 / 8 响应式 / 9 打印与无障碍
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计令牌 —— 明暗双主题只需切换这一层
   -------------------------------------------------------------------------- */
:root {
  /* 字体家族 */
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia,
    "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* 尺寸节奏 */
  --wrap: 1120px;
  --wrap-narrow: 46rem;      /* 正文阅读宽度：约 40~45 个汉字一行 */
  --radius: 10px;
  --radius-lg: 16px;
  --header-h: 64px;

  /* 过渡 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.22s;

  /* 浅色主题：暖白纸感 */
  --bg: #fbfaf7;
  --bg-elevated: #ffffff;
  --bg-subtle: #f3f1ec;
  --bg-code: #f6f4ef;
  --text: #23201c;
  --text-strong: #12100e;
  --text-muted: #8a8377;
  --text-faint: #a9a294;
  --border: #e6e1d8;
  --border-strong: #d5cec2;
  --accent: #b4552d;
  --accent-soft: rgba(180, 85, 45, 0.09);
  --accent-contrast: #ffffff;
  --shadow-sm: 0 1px 2px rgba(35, 32, 28, 0.05);
  --shadow: 0 6px 24px -8px rgba(35, 32, 28, 0.14);
  --shadow-lg: 0 24px 64px -16px rgba(35, 32, 28, 0.24);
  --selection: #f2ded2;
}

html[data-theme="dark"] {
  /* 深色主题：墨色纸感，避免纯黑的生硬 */
  --bg: #15171a;
  --bg-elevated: #1c1f23;
  --bg-subtle: #202429;
  --bg-code: #1b1e22;
  --text: #d9d5cf;
  --text-strong: #f3f0eb;
  --text-muted: #8e877d;
  --text-faint: #6e6862;
  --border: #2a2e34;
  --border-strong: #3a3f46;
  --accent: #e08a5f;
  --accent-soft: rgba(224, 138, 95, 0.13);
  --accent-contrast: #1a120c;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 8px 28px -10px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 28px 70px -18px rgba(0, 0, 0, 0.7);
  --selection: #3d2a1f;
}

/* --------------------------------------------------------------------------
   2. 基础排版
   -------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* 主题切换时的柔和过渡；首帧不参与，避免闪烁 */
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-strong);
  margin: 0;
  letter-spacing: -0.005em;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

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

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

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

kbd.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.6em;
  padding: 0.1em 0.4em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
}

.link-btn {
  padding: 0;
  color: var(--text-muted);
  border-bottom: 1px solid transparent;
}
.link-btn:hover { color: var(--accent); border-bottom-color: currentColor; }

.skip-link {
  position: absolute;
  top: -60px;
  left: 12px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 0; }

/* --------------------------------------------------------------------------
   3. 布局框架
   -------------------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 24px;
}

.site-main {
  flex: 1 0 auto;
  padding-block: 48px 96px;
  outline: none;
}

/* --- 顶栏 --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--header-h);
  /* 不支持 color-mix 的旧浏览器回退为不透明背景，避免滚动时文字重叠 */
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--border); }

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--text-strong);
  white-space: nowrap;
}
.brand__mark {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.brand:hover .brand__mark { transform: scale(1.15); }
.brand__mark { transition: transform var(--dur) var(--ease); }

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}
.nav__link {
  position: relative;
  padding: 6px 12px;
  font-size: 0.94rem;
  color: var(--text-muted);
  border-radius: 7px;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav__link:hover { color: var(--text-strong); }
.nav__link:hover::after,
.nav__link.is-active::after { transform: scaleX(1); }
.nav__link.is-active { color: var(--text-strong); }

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--text-muted);
  border-radius: 9px;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.icon-btn:hover { color: var(--text-strong); background: var(--bg-subtle); }

/* 明暗图标按当前主题显示其一 */
.icon-moon { display: none; }
html[data-theme="dark"] .icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: block; }

.nav-toggle { display: none; }

/* --- 页脚 --- */
.site-footer {
  flex: 0 0 auto;
  border-top: 1px solid var(--border);
  background: var(--bg-subtle);
}
.site-footer__inner {
  padding-block: 32px 40px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.site-footer__line { margin: 0 0 6px; display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; align-items: center; }
.site-footer__line a:hover { color: var(--accent); }
.site-footer__tip { margin: 0; font-size: 0.8rem; color: var(--text-faint); }

/* --- 阅读进度条 --- */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  width: 100%;
  height: 2px;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
  pointer-events: none;
}
.progress.is-visible { opacity: 1; }
.progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.08s linear;
}

/* --------------------------------------------------------------------------
   4. 通用组件
   -------------------------------------------------------------------------- */
/* 标签胶囊 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: 0.76rem;
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: all var(--dur) var(--ease);
}
a.tag:hover,
.tag.is-active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* 分区标题 */
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.section-head__title {
  font-size: 1.16rem;
  letter-spacing: 0.02em;
}
.section-head__aside {
  font-size: 0.84rem;
  font-family: var(--font-mono);
  color: var(--text-faint);
}

/* 元信息行 */
.meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}
.meta__dot { color: var(--text-faint); }
.meta__tags { display: inline-flex; gap: 6px; flex-wrap: wrap; }

/* 空状态 */
.empty {
  padding: 64px 0;
  text-align: center;
  color: var(--text-muted);
}
.empty__title { font-size: 1.3rem; margin-bottom: 8px; color: var(--text-strong); }

/* --------------------------------------------------------------------------
   5. 视图样式
   -------------------------------------------------------------------------- */

/* --- 5.1 首页 Hero --- */
.hero {
  padding-block: 32px 56px;
  animation: rise 0.5s var(--ease) both;
}
.hero__eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  padding: 4px 12px;
  font-size: 0.76rem;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
}
.hero__title {
  font-size: clamp(2.1rem, 5.5vw, 3.1rem);
  line-height: 1.18;
  margin-bottom: 18px;
}
.hero__title em {
  font-style: normal;
  color: var(--accent);
}
.hero__desc {
  max-width: 38rem;
  margin: 0 0 26px;
  font-size: 1.04rem;
  color: var(--text-muted);
  line-height: 1.9;
}
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  font-size: 0.86rem;
  font-family: var(--font-mono);
  color: var(--text-faint);
}
.hero__stats b {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-strong);
}

/* --- 5.2 文章列表 --- */
.post-list { list-style: none; margin: 0; padding: 0; }

.post-item {
  position: relative;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
  animation: rise 0.45s var(--ease) both;
}
.post-item:last-child { border-bottom: none; }

.post-item__date {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.03em;
}
.post-item__title {
  font-size: 1.32rem;
  margin-bottom: 10px;
  transition: color var(--dur) var(--ease);
}
.post-item__link { display: block; }
.post-item:hover .post-item__title { color: var(--accent); }
.post-item__summary {
  margin: 0 0 12px;
  max-width: 44rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.85;
}
.post-item__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-faint);
}
.post-item__tags { display: inline-flex; gap: 6px; flex-wrap: wrap; }

/* 置顶标记 */
.post-item__pin {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  font-size: 0.7rem;
  font-family: var(--font-sans);
  vertical-align: middle;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
}

/* --- 5.3 文章页 --- */
.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 48px;
}
@media (min-width: 1080px) {
  .post-layout { grid-template-columns: minmax(0, var(--wrap-narrow)) 220px; justify-content: center; }
  /* 没有目录栏的页面（如「关于」）用单列，避免内容被空列挤偏 */
  .post-layout--single { grid-template-columns: minmax(0, var(--wrap-narrow)); }
}

.post-header {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
  animation: rise 0.45s var(--ease) both;
}
.post-header__title {
  font-size: clamp(1.8rem, 4.2vw, 2.45rem);
  line-height: 1.24;
  margin-bottom: 18px;
}
.post-header .meta { gap: 10px; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 24px;
  font-size: 0.86rem;
  color: var(--text-muted);
}
.back-link:hover { color: var(--accent); }
.back-link svg { transition: transform var(--dur) var(--ease); }
.back-link:hover svg { transform: translateX(-3px); }

/* 目录 */
.toc {
  display: none;
  position: sticky;
  top: calc(var(--header-h) + 32px);
  align-self: start;
  max-height: calc(100vh - var(--header-h) - 64px);
  overflow-y: auto;
  font-size: 0.84rem;
}
@media (min-width: 1080px) { .toc { display: block; } }

.toc__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.toc__list { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.toc__item a {
  display: block;
  padding: 5px 0 5px 14px;
  margin-left: -1px;
  color: var(--text-muted);
  border-left: 2px solid transparent;
  line-height: 1.5;
  transition: all var(--dur) var(--ease);
}
.toc__item a:hover { color: var(--text-strong); }
.toc__item a.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
}
.toc__item--h3 a { padding-left: 28px; font-size: 0.95em; }

/* 上一篇 / 下一篇 */
.post-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.post-nav__item {
  display: block;
  padding: 16px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--dur) var(--ease);
}
.post-nav__item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.post-nav__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.post-nav__title { font-family: var(--font-serif); font-size: 1rem; color: var(--text-strong); }
.post-nav__item--next { text-align: right; }
.post-nav__item--placeholder { visibility: hidden; }

/* --- 5.4 归档 --- */
.archive-year {
  margin-top: 40px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
  color: var(--text-faint);
}
.archive-list { list-style: none; margin: 12px 0 0; padding: 0; }
.archive-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--border);
}
.archive-list time {
  flex: 0 0 64px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
}
.archive-list a { font-size: 0.98rem; }
.archive-list a:hover { color: var(--accent); }

/* --- 5.5 标签页 --- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}
.tag-cloud .tag { padding: 6px 14px; font-size: 0.86rem; }
.tag-cloud .tag__count {
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  opacity: 0.6;
}

/* --- 5.6 关于页 --- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}
.about-card {
  padding: 28px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.about-card h3 { font-size: 1.05rem; margin-bottom: 10px; }
.about-card p { margin: 0; font-size: 0.92rem; color: var(--text-muted); }

/* --- 5.7 404 --- */
.notfound { padding: 80px 0; text-align: center; }
.notfound__code {
  font-family: var(--font-serif);
  font-size: 5rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.85;
}
.notfound__title { margin: 16px 0 10px; font-size: 1.5rem; }
.notfound__desc { color: var(--text-muted); margin-bottom: 26px; }

/* --------------------------------------------------------------------------
   6. 正文排版（Markdown 渲染结果）
   -------------------------------------------------------------------------- */
.prose {
  font-size: 1.02rem;
  line-height: 1.95;
  color: var(--text);
  word-wrap: break-word;
}
.prose > *:first-child { margin-top: 0; }

.prose p { margin: 0 0 1.5em; }

.prose h2,
.prose h3,
.prose h4 {
  position: relative;
  margin: 2.6em 0 0.9em;
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.prose h2 {
  font-size: 1.5rem;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--border);
}
.prose h3 { font-size: 1.22rem; }
.prose h4 { font-size: 1.06rem; }

/* 标题悬浮锚点 */
.prose .heading-anchor {
  position: absolute;
  left: -1.1em;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  opacity: 0;
  font-weight: 400;
  transition: opacity var(--dur) var(--ease);
}
.prose h2:hover .heading-anchor,
.prose h3:hover .heading-anchor,
.prose h4:hover .heading-anchor,
.prose .heading-anchor:focus { opacity: 0.65; }

.prose a:not(.heading-anchor) {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.prose a:not(.heading-anchor):hover {
  border-bottom-color: var(--accent);
  background: var(--accent-soft);
}

.prose strong { font-weight: 650; color: var(--text-strong); }
.prose em { font-style: italic; }
.prose del { color: var(--text-faint); }
.prose mark {
  padding: 1px 4px;
  background: var(--accent-soft);
  color: inherit;
  border-radius: 3px;
}

.prose ul,
.prose ol { margin: 0 0 1.5em; padding-left: 1.5em; }
.prose li { margin-bottom: 0.55em; }
.prose li::marker { color: var(--text-faint); }
.prose ul.contains-task-list { list-style: none; padding-left: 0.2em; }
.prose .task-list-item { display: flex; align-items: flex-start; gap: 9px; }
.prose .task-list-item input[type="checkbox"] {
  margin-top: 0.55em;
  accent-color: var(--accent);
}

.prose blockquote {
  margin: 1.8em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--accent);
  color: var(--text-muted);
  font-style: normal;
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose blockquote strong { color: var(--text); }

/* 提示块 [!NOTE] / [!TIP] / [!WARNING] / [!IMPORTANT] */
.prose .callout {
  margin: 1.8em 0;
  padding: 16px 20px;
  background: var(--accent-soft);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text);
  font-size: 0.96rem;
}
.prose .callout__label {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
.prose .callout p:last-child { margin-bottom: 0; }

/* 行内代码 */
.prose code {
  padding: 0.15em 0.42em;
  font-family: var(--font-mono);
  font-size: 0.87em;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 5px;
  word-break: break-word;
}

/* 代码块 */
.prose .code-block {
  position: relative;
  margin: 1.8em 0;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.prose .code-block__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 14px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.prose .code-block__copy {
  padding: 2px 8px;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  border-radius: 5px;
  transition: all var(--dur) var(--ease);
}
.prose .code-block__copy:hover { color: var(--accent); background: var(--accent-soft); }
.prose .code-block__copy.is-done { color: var(--accent); }
.prose .code-block pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.7;
  -webkit-overflow-scrolling: touch;
}
.prose .code-block code {
  padding: 0;
  background: none;
  border: none;
  font-size: inherit;
  white-space: pre;
}

/* 表格 */
.prose .table-scroll {
  margin: 1.8em 0;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.prose th,
.prose td {
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.prose thead th {
  background: var(--bg-subtle);
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text-strong);
  white-space: nowrap;
}
.prose tbody tr:last-child td { border-bottom: none; }
.prose tbody tr:hover { background: var(--bg-subtle); }

/* 图片与图注 */
.prose figure { margin: 2em 0; }
.prose figure img {
  display: block;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}
.prose figcaption {
  margin-top: 10px;
  font-size: 0.84rem;
  color: var(--text-faint);
  text-align: center;
}
.prose img { border-radius: var(--radius); }

/* 深色主题下，单色线条类矢量图（SVG）做反相，避免黑线消失在深色背景里。
   位图（jpg/png）不做处理，只反相 .svg。 */
html[data-theme="dark"] .prose figure img[src$=".svg"],
html[data-theme="dark"] .prose img[src$=".svg"] {
  filter: invert(1) hue-rotate(180deg);
  background: transparent;
  border-color: var(--border-strong);
}

/* 轻量数学排版（不引入 KaTeX，仅做字体与间距处理） */
.prose .math {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05em;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.prose .math-block {
  margin: 1.8em 0;
  padding: 14px 18px;
  text-align: center;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.12rem;
  letter-spacing: 0.03em;
  color: var(--text-strong);
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}

/* 分隔线 */
.prose hr {
  width: 60px;
  margin: 3em auto;
  border-top: 1px solid var(--border-strong);
}

/* --------------------------------------------------------------------------
   7. 搜索浮层
   -------------------------------------------------------------------------- */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: flex;
  justify-content: center;
  padding: 12vh 20px 20px;
  background: rgba(0, 0, 0, 0.45);
  background: color-mix(in srgb, var(--bg) 55%, rgba(0, 0, 0, 0.5));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fade 0.18s var(--ease);
}
.search-overlay[hidden] { display: none; }

.search-panel {
  width: 100%;
  max-width: 620px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: pop 0.2s var(--ease);
}
.search-panel__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text-faint);
}
.search-panel__head input {
  flex: 1;
  min-width: 0;
  padding: 4px 0;
  font-size: 1.02rem;
  color: var(--text);
  background: none;
  border: none;
  outline: none;
}
.search-panel__head input::placeholder { color: var(--text-faint); }
.search-panel__head input::-webkit-search-cancel-button { display: none; }

.search-panel__body {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}
.search-result {
  display: block;
  padding: 12px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease);
}
.search-result:hover,
.search-result.is-selected { background: var(--bg-subtle); }
.search-result__title {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--text-strong);
  margin-bottom: 4px;
}
.search-result.is-selected .search-result__title { color: var(--accent); }
.search-result__meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-faint);
}
.search-result__snippet {
  margin-top: 5px;
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-result mark {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 3px;
  padding: 0 2px;
}
.search-hint {
  padding: 36px 20px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-faint);
}
.search-panel__foot {
  display: flex;
  gap: 18px;
  padding: 9px 18px;
  border-top: 1px solid var(--border);
  background: var(--bg-subtle);
  font-size: 0.74rem;
  color: var(--text-faint);
}
.search-panel__foot span { display: inline-flex; align-items: center; gap: 5px; }

/* --------------------------------------------------------------------------
   8. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 860px) {
  .wrap { padding-inline: 20px; }
  .site-main { padding-block: 28px 72px; }

  .nav-toggle { display: inline-flex; }

  /* 移动端导航：从顶栏下拉 */
  .nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 8px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--dur) var(--ease);
  }
  .nav.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav__link { padding: 12px 14px; font-size: 1rem; }
  .nav__link::after { display: none; }
  .nav__link.is-active { background: var(--accent-soft); color: var(--accent); }

  .hero { padding-block: 16px 40px; }
  .hero__stats { gap: 20px; }
  .post-header { margin-bottom: 28px; }
  .prose { font-size: 1rem; line-height: 1.9; }
  .prose .heading-anchor { display: none; }
  .post-nav__item--next { text-align: left; }
  .search-overlay { padding-top: 6vh; }
}

@media (max-width: 480px) {
  .archive-list li { flex-direction: column; gap: 2px; }
  .archive-list time { flex: none; }
  .hero__stats b { font-size: 1.3rem; }
}

/* --------------------------------------------------------------------------
   9. 打印与无障碍
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .site-footer,
  .toc,
  .progress,
  .post-nav,
  .search-overlay,
  .back-link { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .prose a { color: #000; border-bottom: none; }
  .prose .code-block { border-color: #ccc; }
  .wrap { max-width: none; padding: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 入场动画 */
@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}
@keyframes fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes pop {
  from { opacity: 0; transform: translateY(-8px) scale(0.985); }
  to   { opacity: 1; transform: none; }
}