/* ============================================================
   墨径 · 个人博客样式
   布局：左侧边栏（站点导航 / 分类 / 标签） + 右侧主栏（正文）
   字体：系统普通字体（无衬线）
   零依赖，纯 CSS；支持浅色 / 深色主题
   ============================================================ */

:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC",
    sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;

  --bg: #faf9f7;
  --bg-soft: #f2f0eb;
  --card: #ffffff;
  --text: #1d2126;
  --text-soft: #5b6270;
  --text-faint: #8a909c;
  --border: #e6e3dc;
  --border-strong: #d4cfc4;
  --accent: #b4453a;
  --accent-soft: #f7e9e5;
  --accent-text: #a03a30;
  --code-bg: #f1eeE7;
  --pre-bg: #1e2329;
  --pre-text: #e8eef4;
  --shadow: 0 1px 2px rgba(29, 33, 38, 0.05), 0 8px 22px -14px rgba(29, 33, 38, 0.22);
  --shadow-lg: 0 2px 6px rgba(29, 33, 38, 0.06), 0 18px 40px -22px rgba(29, 33, 38, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --sidebar-w: 264px;
  --page-max: 1320px;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #15181d;
  --bg-soft: #1b1f26;
  --card: #1d222a;
  --text: #e6e8ed;
  --text-soft: #a4abb8;
  --text-faint: #7b828e;
  --border: #2b313a;
  --border-strong: #3a424d;
  --accent: #e8836f;
  --accent-soft: #32211e;
  --accent-text: #f0a08d;
  --code-bg: #232830;
  --pre-bg: #0f1216;
  --pre-text: #dfe6ee;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 22px -14px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 2px 6px rgba(0, 0, 0, 0.5), 0 18px 40px -22px rgba(0, 0, 0, 0.8);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15181d;
    --bg-soft: #1b1f26;
    --card: #1d222a;
    --text: #e6e8ed;
    --text-soft: #a4abb8;
    --text-faint: #7b828e;
    --border: #2b313a;
    --border-strong: #3a424d;
    --accent: #e8836f;
    --accent-soft: #32211e;
    --accent-text: #f0a08d;
    --code-bg: #232830;
    --pre-bg: #0f1216;
    --pre-text: #dfe6ee;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 22px -14px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 2px 6px rgba(0, 0, 0, 0.5), 0 18px 40px -22px rgba(0, 0, 0, 0.8);
    color-scheme: dark;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
  overflow-y: scroll;
  /* 始终给滚动条留位置：即使某些浏览器不隐藏默认滚动条，内容宽度也不会跳动 */
  scrollbar-gutter: stable;
  /* 隐藏浏览器默认滚动条（顶部已有阅读进度条提示位置） */
  scrollbar-width: none;
  -ms-overflow-style: none;
  /* 移动端：全局去掉"点击变蓝"的原生高亮（该属性可继承，会作用到所有元素） */
  -webkit-tap-highlight-color: transparent;
}

/* Chromium / Safari：整页滚动条不占位、不显示；滚动本身不受影响 */
html::-webkit-scrollbar,
body::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15.5px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-text);
  text-decoration: none;
  transition: color 0.16s ease;
}

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

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

code,
pre,
kbd,
samp {
  font-family: var(--font-mono);
}

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

/* ---------------------------------------------- 阅读进度 */

.reading-progress {
  position: fixed;
  inset: 0 auto auto 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), #d98b5f);
  z-index: 60;
  transition: width 0.1s linear;
}

/* ---------------------------------------------- 整体骨架：边栏 + 主栏 */

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  max-width: var(--page-max);
  margin: 0 auto;
  min-height: 100vh;
}

/* ---------------------------------------------- 边栏 */

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 26px 20px 22px;
  border-right: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-soft) 55%, var(--bg));
  /* 移动端：点链接不要出现文字选中（蓝色）高亮 */
  -webkit-user-select: none;
  user-select: none;
  /* 隐藏滚动条，但仍可滚动 */
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sidebar::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

/* 桌面端：边栏内容就在面板里，面板撑满剩余高度 */
.sidebar-panel {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 18px;
  margin-top: 18px;
  min-height: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: inherit;
}

/* 品牌标记：一个实心圆点 */
.brand-mark {
  flex: 0 0 auto;
  display: block;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
}

.brand-text {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 7px;
  min-width: 0;
  line-height: 1.25;
}

.brand-text strong {
  font-size: 16.5px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.brand-text small {
  color: var(--text-faint);
  font-size: 12px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.side-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.side-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-soft);
  font-family: inherit;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: background 0.16s ease, color 0.16s ease;
}

.side-nav-link:hover {
  background: var(--bg-soft);
  color: var(--text);
}

.side-nav-link.is-active {
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 600;
}

.side-nav-link svg {
  color: currentColor;
  opacity: 0.8;
}

.side-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.side-title {
  margin: 0;
  color: var(--text-faint);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.side-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 13.5px;
}

.side-list a:hover {
  background: var(--bg-soft);
  color: var(--text);
}

.side-list .is-active a {
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 600;
}

.side-count {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.compact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.compact-item a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 9px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 13px;
}

.compact-item a:hover {
  background: var(--bg-soft);
  color: var(--text);
}

.compact-item time {
  flex: 0 0 auto;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 11px;
}

.compact-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.side-foot {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 11.5px;
}

.side-foot a {
  color: var(--text-soft);
}

/* 主题图标 */

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

[data-theme="dark"] .icon-moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun {
    display: none;
  }
  :root:not([data-theme="light"]) .icon-moon {
    display: block;
  }
}

/* ---------------------------------------------- 主栏 */

.main-col {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 42px 48px 64px;
}

.main {
  flex: 1;
  min-width: 0;
}

/* ---------------------------------------------- 首页 hero */

.hero {
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.hero-kicker {
  margin: 0 0 8px;
  color: var(--accent-text);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0 0 10px;
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 20px;
  color: var(--text-soft);
  font-size: 13px;
}

.hero-stats strong {
  margin-right: 3px;
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 9px;
  max-width: 400px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--text-faint);
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-box input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 14px;
}

/* ---------------------------------------------- 文章卡片 */

.cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  position: relative;
  display: flex;
  gap: 16px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  /* 触屏点击时不出现灰色的文字高亮块 */
  -webkit-tap-highlight-color: transparent;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

.card-index {
  flex: 0 0 auto;
  padding-top: 3px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 12px;
}

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

.card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: var(--text-faint);
  font-size: 12.5px;
}

.card-cat {
  position: relative;
  z-index: 2;
  font-weight: 600;
  color: var(--accent-text);
}

.dot {
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--border-strong);
}

.card-title {
  margin: 6px 0 5px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
}

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

/* 桌面端：只有鼠标移到标题文字上，标题才变红（和最初的行为一致） */
.card-title a:hover,
.card-title a:focus-visible {
  color: var(--accent);
}

/* 键盘 Tab 聚焦到卡片里的链接时，整张卡片描边提示 */
.card:has(.card-title a:focus-visible) {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* 触屏设备（手机/平板）：整张卡片可点，且点击时不出现文字高亮 */
@media (hover: none), (pointer: coarse) {
  .card {
    touch-action: manipulation;
    cursor: pointer;
  }

  /* 标题链接的影子铺满整张卡片（HTML 里仍是合法的一个链接） */
  .card-title a::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
  }

  .card-cat {
    position: relative;
    z-index: 2; /* 分类链接压在整卡链接之上，仍然可单独点 */
  }

  .card:active {
    background: var(--bg-soft);
  }
}

.card-desc {
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text-soft);
  font-size: 13.5px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

/* ---------------------------------------------- chip */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text-soft);
  font-size: 12.5px;
  line-height: 1.7;
  transition: all 0.16s ease;
}

.chip:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-text);
}

.chip-static,
.chip-static:hover {
  border-color: var(--border);
  background: var(--bg-soft);
  color: var(--text-soft);
  cursor: default;
}

.chip-count {
  padding-left: 2px;
  color: var(--text-faint);
  font-size: 11px;
}

.chip-lg {
  padding: 7px 15px;
  font-size: 14px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  padding: 4px 0 20px;
}

.chips-wrap {
  gap: 5px;
}

/* ---------------------------------------------- 页面头部 */

.page-head {
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.page-head h1 {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 6px 0 8px;
  font-size: clamp(24px, 2.8vw, 30px);
  line-height: 1.3;
}

.page-head > p {
  margin: 0 0 12px;
  max-width: 68ch;
  color: var(--text-soft);
}

.page-head-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  color: var(--text-faint);
  font-size: 13px;
}

.page-head .search-box {
  margin-top: 14px;
  max-width: 340px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: center;
  color: var(--text-faint);
  font-size: 12.5px;
}

.breadcrumb b {
  color: var(--text-soft);
  font-weight: 500;
}

.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  vertical-align: middle;
}

/* ---------------------------------------------- 分类总览 */

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 16px;
}

.category-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.category-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.category-card header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.category-card h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.category-card h2 a {
  color: var(--text);
}

.category-count {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.category-more {
  display: inline-block;
  margin-top: 10px;
  font-size: 13px;
  font-weight: 600;
}

/* ---------------------------------------------- 归档 */

.archive-year {
  margin-bottom: 26px;
}

.archive-year h2 {
  margin: 0 0 10px;
  padding-bottom: 7px;
  border-bottom: 1px dashed var(--border-strong);
  font-size: 19px;
  font-weight: 600;
}

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

.archive-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 6px;
  border-bottom: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.archive-list li:hover {
  background: var(--bg-soft);
}

.archive-list time {
  flex: 0 0 auto;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 12px;
}

.archive-list a {
  flex: 1;
  min-width: 0;
  color: var(--text);
  font-size: 14.5px;
}

.archive-list a:hover {
  color: var(--accent);
}

.archive-cat {
  flex: 0 0 auto;
  color: var(--text-faint);
  font-size: 11.5px;
}

.more-link {
  margin-top: 22px;
  text-align: center;
  font-size: 13.5px;
}

.more-link a {
  display: inline-block;
  padding: 9px 20px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--text-soft);
}

.more-link a:hover {
  border-color: var(--accent);
  color: var(--accent-text);
}

.empty {
  padding: 24px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  color: var(--text-faint);
  text-align: center;
  font-size: 13.5px;
}

/* ---------------------------------------------- 文章页 */

.post-head {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 22px;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  color: var(--text-faint);
  font-size: 12.5px;
}

.post-head h1 {
  margin: 10px 0 12px;
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1.32;
}

.post-desc {
  margin: 0 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
  color: var(--text-soft);
  font-size: 14.5px;
}

.post-cover {
  display: block;
  width: 100%;
  margin-bottom: 24px;
  border-radius: var(--radius);
}

/* 目录 / 专栏卡片 */

.toc-card {
  margin: 0 0 18px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
}

.toc-card > summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  border-radius: var(--radius);
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

.toc-card > summary::before {
  content: "▸";
  color: var(--text-faint);
  font-size: 11px;
  transition: transform 0.16s ease;
}

.toc-card[open] > summary::before {
  transform: rotate(90deg);
}

.toc-card > summary:hover {
  color: var(--accent-text);
}

.toc-count {
  padding: 0 7px;
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text-faint);
  font-size: 11px;
  font-weight: 500;
}

.toc-card ul,
.toc-card ol {
  margin: 0;
  padding: 0 16px 12px;
  list-style: none;
}

.toc-card li a {
  display: block;
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 10px;
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.6;
}

.toc-card li a:hover {
  color: var(--text);
}

.toc-card .is-active > a {
  border-left-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}

.toc-card .toc-l3 a {
  padding-left: 24px;
  color: var(--text-faint);
  font-size: 12.5px;
}

/* 专栏卡片（文章页里的专栏目录） */
.column-card ol {
  counter-reset: column;
  list-style: none;
  padding-left: 16px;
}

.column-card li {
  counter-increment: column;
  padding: 3px 0;
}

.column-card li a {
  color: var(--text-soft);
  font-size: 13px;
}

.column-card li a::before {
  content: counter(column) ". ";
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 11px;
}

.column-card .is-active > a {
  color: var(--accent-text);
  font-weight: 600;
}

.post-column {
  color: var(--accent-text);
}

/* 正文 */

.post-content {
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text);
  overflow-wrap: break-word;
}

.post-content > *:first-child {
  margin-top: 0;
}

.post-content p {
  margin: 0 0 1.05em;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  position: relative;
  margin: 1.9em 0 0.65em;
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.4;
  scroll-margin-top: 24px;
}

.post-content h1 {
  font-size: 1.5em;
}

.post-content h2 {
  font-size: 1.32em;
  padding-bottom: 0.28em;
  border-bottom: 1px solid var(--border);
}

.post-content h3 {
  font-size: 1.14em;
}

.post-content h4 {
  font-size: 1.02em;
}

.post-content h2 .anchor,
.post-content h3 .anchor {
  position: absolute;
  margin-left: 7px;
  color: var(--border-strong);
  font-size: 0.72em;
  font-weight: 400;
  opacity: 0;
  transition: opacity 0.16s ease;
}

.post-content h2:hover .anchor,
.post-content h3:hover .anchor {
  opacity: 1;
}

.post-content a {
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
}

.post-content a:hover {
  border-bottom-color: var(--accent);
}

.post-content ul,
.post-content ol {
  margin: 0 0 1.05em;
  padding-left: 1.45em;
}

.post-content li {
  margin: 0.28em 0;
}

.post-content li > ul,
.post-content li > ol {
  margin: 0.28em 0;
}

.post-content blockquote {
  margin: 1.3em 0;
  padding: 10px 18px;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--bg-soft);
  color: var(--text-soft);
  font-size: 0.97em;
}

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

.post-content hr {
  height: 1px;
  margin: 2.2em 0;
  border: 0;
  background: var(--border);
}

.post-content code {
  padding: 0.15em 0.4em;
  border-radius: 5px;
  background: var(--code-bg);
  color: var(--accent-text);
  font-size: 0.86em;
}

.post-content .code-block {
  position: relative;
  margin: 1.4em 0;
  border-radius: var(--radius);
  background: var(--pre-bg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.post-content .code-block pre {
  margin: 0;
  padding: 36px 16px 15px;
  overflow-x: auto;
  color: var(--pre-text);
  font-size: 13px;
  line-height: 1.7;
}

.post-content .code-block code {
  padding: 0;
  background: none;
  color: inherit;
  font-size: inherit;
}

.code-lang {
  position: absolute;
  top: 10px;
  left: 15px;
  color: #8b95a1;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.copy-btn {
  position: absolute;
  top: 7px;
  right: 9px;
  padding: 3px 9px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  color: #b6c0cc;
  font-family: var(--font-sans);
  font-size: 11px;
  cursor: pointer;
  opacity: 0;
  transition: all 0.16s ease;
}

.code-block:hover .copy-btn {
  opacity: 1;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.copy-btn.is-done {
  border-color: rgba(127, 211, 155, 0.5);
  color: #7fd39b;
  opacity: 1;
}

.table-wrap {
  margin: 1.4em 0;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.post-content th,
.post-content td {
  padding: 9px 13px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.post-content thead th {
  background: var(--bg-soft);
  font-weight: 600;
  white-space: nowrap;
}

.post-content tbody tr:last-child td {
  border-bottom: 0;
}

.post-content tbody tr:hover {
  background: var(--bg-soft);
}

.post-content img {
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}

.post-content .task-list {
  padding-left: 0.2em;
  list-style: none;
}

.task {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.task input {
  margin-top: 0.5em;
  accent-color: var(--accent);
}

.post-content mark {
  padding: 0 2px;
  border-radius: 3px;
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  color: inherit;
}

.post-foot {
  margin-top: 38px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  text-align: center;
  font-size: 12.5px;
}

.post-sign {
  margin: 0 0 6px;
  letter-spacing: 0.24em;
}

.post-source code {
  font-size: 11.5px;
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 26px;
}

.post-nav-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.post-nav-item span {
  color: var(--text-faint);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.post-nav-item strong {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.45;
}

.post-nav-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.post-nav-item.next {
  align-items: flex-end;
  text-align: right;
}

.post-nav-item.is-empty {
  visibility: hidden;
}

.related {
  margin-top: 30px;
}

.block-title {
  margin: 0 0 10px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
  font-weight: 600;
}

/* ---------------------------------------------- 回到顶部 */

.to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--card);
  color: var(--text-soft);
  font-size: 15px;
  cursor: pointer;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: all 0.2s ease;
  z-index: 40;
}

.to-top.is-visible {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.to-top:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------------------------------------------- 状态 */

[hidden] {
  display: none !important;
}

.is-hidden {
  display: none !important;
}

/* ---------------------------------------------- 抽屉侧栏（移动端） */

/* 移动端元素在桌面端一律不显示 */
.nav-toggle,
.nav-backdrop {
  display: none;
}

.sidebar-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

/* 通用图标按钮（主题切换等） */
.icon-btn {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--card);
  color: var(--text-soft);
  line-height: 1;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease,
    transform 0.12s ease;
}

.icon-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-text);
}

.icon-btn:active {
  transform: scale(0.95);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle {
  width: 30px;
  height: 30px;
}

/* ---------------------------------------------- 响应式 */

/* 窄屏：侧栏本体变成顶部工具条，导航内容变成圆角抽屉 */
@media (max-width: 1080px) {
  .shell {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 顶部有吸顶工具条，锚点跳转时留出空间 */
  html {
    scroll-padding-top: 70px;
  }

  .post-content h2,
  .post-content h3,
  .post-content h4 {
    scroll-margin-top: 72px;
  }

  /* ---------- 顶部细工具条（侧栏本体） ---------- */
  .sidebar {
    position: sticky;
    top: 0;
    z-index: 70; /* 必须高于遮罩，否则抽屉会被遮罩盖住 */
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    height: 54px;
    width: 100%;
    padding: 0 10px;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
  }

  .sidebar-bar {
    flex: 1 1 auto;
    min-width: 0;
  }

  .sidebar-bar .brand {
    min-width: 0;
    overflow: hidden;
  }

  /* 工具条上的按钮放大到易点击的尺寸 */
  .sidebar-bar .theme-toggle {
    width: 36px;
    height: 36px;
  }

  /* ---------- 汉堡按钮：两条线动画成 ✕ ---------- */
  .nav-toggle {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--card);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.12s ease;
  }

  .nav-toggle:active {
    transform: scale(0.94);
  }

  .nav-toggle .bars,
  .nav-toggle .bars::before,
  .nav-toggle .bars::after {
    content: "";
    display: block;
    width: 16px;
    height: 2px;
    border-radius: 2px;
    background-color: var(--text);
    transition: transform 0.26s cubic-bezier(0.22, 0.9, 0.3, 1), opacity 0.18s ease,
      background-color 0.18s ease;
  }

  .nav-toggle .bars {
    position: relative;
  }

  .nav-toggle .bars::before {
    position: absolute;
    left: 0;
    top: -5px;
  }

  .nav-toggle .bars::after {
    position: absolute;
    left: 0;
    top: 5px;
  }

  .sidebar.open .nav-toggle {
    border-color: var(--accent);
    background: var(--accent-soft);
  }

  .sidebar.open .nav-toggle .bars {
    background-color: transparent;
  }

  .sidebar.open .nav-toggle .bars::before {
    transform: translateY(5px) rotate(45deg);
    background-color: var(--accent);
  }

  .sidebar.open .nav-toggle .bars::after {
    transform: translateY(-5px) rotate(-45deg);
    background-color: var(--accent);
  }

  /* ---------- 圆角抽屉面板 ---------- */
  .sidebar-panel {
    position: fixed;
    top: 62px;
    left: 8px;
    bottom: 8px;
    width: min(78vw, 320px);
    display: flex;
    flex: 0 0 auto;
    flex-direction: column;
    gap: 4px;
    margin-top: 0;
    min-height: 0;
    padding: 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 26px 52px -22px rgba(0, 0, 0, 0.55), 0 3px 10px rgba(0, 0, 0, 0.16);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    z-index: 1;
    transform: translateX(-118%) scale(0.96);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    /* 关闭时：先播完收回动画，最后才真正隐藏 */
    transition: transform 0.34s cubic-bezier(0.22, 0.9, 0.3, 1), opacity 0.24s ease,
      visibility 0s linear 0.34s;
  }

  .sidebar.open .sidebar-panel {
    transform: translateX(0) scale(1);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    /* 打开时：立即可见，动画跑完再收尾 */
    transition: transform 0.34s cubic-bezier(0.22, 0.9, 0.3, 1), opacity 0.24s ease,
      visibility 0s linear 0s;
  }

  /* 逐项入场动画 */
  .sidebar.open .sidebar-panel > * {
    animation: sidebar-nav-in 0.3s cubic-bezier(0.22, 0.9, 0.3, 1) both;
  }

  .sidebar.open .sidebar-panel > *:nth-child(1) {
    animation-delay: 0.03s;
  }

  .sidebar.open .sidebar-panel > *:nth-child(2) {
    animation-delay: 0.06s;
  }

  .sidebar.open .sidebar-panel > *:nth-child(3) {
    animation-delay: 0.09s;
  }

  .sidebar.open .sidebar-panel > *:nth-child(4) {
    animation-delay: 0.12s;
  }

  .sidebar.open .sidebar-panel > *:nth-child(5) {
    animation-delay: 0.15s;
  }

  .sidebar.open .sidebar-panel > *:nth-child(6) {
    animation-delay: 0.18s;
  }

  .sidebar.open .sidebar-panel > *:nth-child(7) {
    animation-delay: 0.21s;
  }

  .sidebar.open .sidebar-panel > *:nth-child(n + 8) {
    animation-delay: 0.24s;
  }

  @keyframes sidebar-nav-in {
    from {
      opacity: 0;
      transform: translateX(-12px);
    }
    to {
      opacity: 1;
      transform: translateX(0);
    }
  }

  /* 抽屉内的条目更宽松一些，便于点击 */
  .sidebar-panel .side-nav {
    gap: 2px;
    padding-bottom: 10px;
  }

  .sidebar-panel .side-nav-link {
    padding: 9px 11px;
    font-size: 14px;
    border-radius: 10px;
  }

  .sidebar-panel .side-list a {
    padding: 8px 11px;
    font-size: 13.5px;
    border-radius: 10px;
  }

  .sidebar-panel .compact-item a {
    padding: 7px 11px;
    border-radius: 10px;
  }

  .sidebar-panel .side-foot {
    margin-top: 4px;
  }

  /* ---------- 遮罩：淡入淡出 ---------- */
  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(8, 14, 24, 0.48);
    z-index: 55;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.26s ease, visibility 0.26s ease;
  }

  .nav-backdrop.show {
    opacity: 1;
    visibility: visible;
  }

  .main-col {
    padding: 18px 16px 48px;
  }

  /* 顶部工具条是吸顶的，让阅读进度条画在它上面 */
  .reading-progress {
    z-index: 80;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar,
  .sidebar-panel,
  .nav-backdrop,
  .nav-toggle .bars,
  .nav-toggle .bars::before,
  .nav-toggle .bars::after {
    transition: none;
    animation: none;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 15px;
  }

  .main-col {
    padding: 16px 15px 48px;
  }

  .card {
    padding: 15px 15px;
    gap: 10px;
  }

  .card-index {
    display: none;
  }

  .card-title {
    font-size: 16.5px;
  }

  .post-content {
    font-size: 16px;
    line-height: 1.82;
  }

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

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

  .archive-list li {
    flex-wrap: wrap;
    gap: 7px;
  }

  .to-top {
    right: 13px;
    bottom: 15px;
  }
}

@media print {
  .sidebar,
  .nav-backdrop,
  .to-top,
  .post-nav,
  .related,
  .reading-progress,
  .toc-card {
    display: none !important;
  }

  .shell {
    display: block;
  }

  .main-col {
    padding: 0;
  }

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