@charset "UTF-8";
/* ==========================================================================
   DocHub 主题「墨刻」· 编辑杂志（SC-10 editorial）
   结构、交互契约与「澄蓝」版完全一致，差异只在视觉层：
   米纸底 · 衬线大字 · 零圆角 · 无阴影 · 细分隔线 · 编号章节 · 首字下沉
   字体：标题 Noto Serif SC（本地 woff2 分片），正文系统无衬线，拉丁数字 Newsreader
   目录：00 令牌 / 01 基础 / 02 通用组件 / 03 页头 / 04 三栏骨架 / 05 文档树
         06 首页 / 07 目录页 / 08 正文页 / 09 本页目录 / 10 页脚与浮层 / 11 响应式
   ========================================================================== */

/* --------------------------------------------------------------------------
   00. 设计令牌（风格卡 SC-10 取值，禁止在别处自创数值）
   -------------------------------------------------------------------------- */
:root {
  /* 色彩：米纸 + 近黑 + 单一酒红强调 */
  --dh-paper: #FBF8F3;
  --dh-paper-deep: #F4EFE6;
  --dh-card: #FFFFFF;
  --dh-ink: #1A1A1A;
  --dh-ink-2: #555555;
  /* 基线灰：米纸底 5.0:1 / 米纸深底 4.6:1，满足 AA（原 #8A8A8A 仅 3.2:1，不达标） */
  --dh-ink-3: #6B6B6B;
  --dh-line: #E4DED2;
  --dh-line-strong: #C9C0AE;
  --dh-accent: #8B1E3F;
  --dh-accent-deep: #6E1731;
  --dh-accent-soft: #F3E7EA;
  --dh-green: #1E4D3B;
  --dh-green-soft: #E8EFEA;

  /* 字体：标题衬线 / 正文无衬线 / 拉丁数字衬线 / 等宽 */
  --dh-serif: "Noto Serif SC Variable", "Songti SC", "SimSun", "Noto Serif CJK SC", serif;
  --dh-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --dh-latin: "Newsreader Variable", Georgia, "Times New Roman", serif;
  --dh-mono: "JetBrains Mono", "Cascadia Mono", "SF Mono", Consolas, "Courier New", monospace;

  /* 字号 */
  --dh-text-xs: 12px;
  --dh-text-sm: 13px;
  --dh-text-base: 18px;
  --dh-text-md: 19px;
  --dh-text-lg: 22px;
  --dh-text-xl: 28px;
  --dh-text-2xl: 34px;
  --dh-text-3xl: 46px;
  --dh-text-masthead: 64px;

  /* 行高 */
  --dh-leading-tight: 1.24;
  --dh-leading-snug: 1.45;
  --dh-leading-body: 1.85;

  /* 间距：8 基数 */
  --dh-space-1: 4px;
  --dh-space-2: 8px;
  --dh-space-3: 12px;
  --dh-space-4: 16px;
  --dh-space-5: 24px;
  --dh-space-6: 32px;
  --dh-space-7: 48px;
  --dh-space-8: 64px;
  --dh-space-9: 96px;

  /* 尺寸 */
  --dh-header-h: 64px;
  --dh-sidebar-w: 264px;
  --dh-toc-w: 220px;
  --dh-content-w: 820px;
  --dh-container: 1440px;
  --dh-tap: 44px;

  /* 边线：本风格不用阴影，层次全部交给 1px 线 */
  --dh-hairline: 1px solid var(--dh-line);
  --dh-rule: 1px solid var(--dh-ink);
  --dh-radius: 0px;
  --dh-radius-sm: 2px;

  /* 动效：几乎无，仅颜色与下划线过渡 */
  --dh-duration: 140ms;
  --dh-ease: cubic-bezier(.2, .6, .2, 1);

  --dh-focus: 0 0 0 2px var(--dh-paper), 0 0 0 3px var(--dh-accent);
}

/* --------------------------------------------------------------------------
   01. 基础
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  /* 锚点偏移的唯一来源：固定页头高度 + 16 呼吸位 */
  scroll-padding-top: calc(var(--dh-header-h) + 16px);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--dh-paper);
  color: var(--dh-ink);
  font-family: var(--dh-sans);
  font-size: var(--dh-text-base);
  line-height: var(--dh-leading-body);
  font-feature-settings: "kern" 1;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--dh-serif);
  font-weight: 600;
  line-height: var(--dh-leading-tight);
  letter-spacing: -0.01em;
  color: var(--dh-ink);
}

p, ul, ol, dl, figure, blockquote, pre, table {
  margin: 0;
}

ul, ol {
  padding-left: 1.35em;
}

a {
  color: var(--dh-accent);
  text-decoration: none;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color var(--dh-duration) var(--dh-ease);
}

a:hover {
  color: var(--dh-accent-deep);
  text-decoration: underline;
}

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: none;
  box-shadow: var(--dh-focus);
}

::selection {
  background: var(--dh-accent);
  color: var(--dh-paper);
}

/* 滚动条：细、无圆角 */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--dh-line-strong) transparent;
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-thumb {
  background: var(--dh-line-strong);
  border: 3px solid var(--dh-paper);
}

/* --------------------------------------------------------------------------
   02. 通用组件
   -------------------------------------------------------------------------- */
.dh-skip-link {
  position: absolute;
  top: -100px;
  left: var(--dh-space-4);
  z-index: 200;
  padding: var(--dh-space-2) var(--dh-space-4);
  background: var(--dh-ink);
  color: var(--dh-paper);
  font-size: var(--dh-text-sm);
}

.dh-skip-link:focus {
  top: var(--dh-space-3);
  color: var(--dh-paper);
}

.dh-visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.dh-icon {
  width: 18px;
  height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.dh-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--dh-tap);
  height: var(--dh-tap);
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--dh-ink-2);
  cursor: pointer;
  transition: color var(--dh-duration) var(--dh-ease);
}

.dh-icon-btn:hover {
  color: var(--dh-ink);
}

/* 按钮：直角、墨底或描边，不用圆角与投影 */
.dh-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--dh-space-2);
  min-height: var(--dh-tap);
  padding: 0 var(--dh-space-5);
  border: 1px solid var(--dh-ink);
  border-radius: var(--dh-radius);
  background: transparent;
  color: var(--dh-ink);
  font-family: var(--dh-sans);
  font-size: var(--dh-text-sm);
  letter-spacing: .1em;
  cursor: pointer;
  transition: background var(--dh-duration) var(--dh-ease),
              color var(--dh-duration) var(--dh-ease),
              border-color var(--dh-duration) var(--dh-ease);
}

.dh-btn:hover {
  background: var(--dh-ink);
  color: var(--dh-paper);
  text-decoration: none;
}

.dh-btn--primary {
  background: var(--dh-ink);
  color: var(--dh-paper);
  border-color: var(--dh-ink);
}

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

.dh-btn--quiet {
  padding: 0;
  min-height: 0;
  border: 0;
  background: none;
  color: var(--dh-ink-2);
  letter-spacing: 0;
  text-decoration: underline;
  text-decoration-color: var(--dh-line-strong);
}

.dh-btn--quiet:hover {
  background: none;
  color: var(--dh-accent);
}

/* --------------------------------------------------------------------------
   03. 页头：细线 + 衬线刊名 + 字距放大的小字导航
   -------------------------------------------------------------------------- */
.dh-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--dh-paper);
  border-bottom: var(--dh-rule);
}

.dh-header__inner {
  display: flex;
  align-items: center;
  gap: var(--dh-space-4);
  max-width: var(--dh-container);
  min-height: var(--dh-header-h);
  margin: 0 auto;
  /* 与 A 套同一对齐基准：左内侧 24px（外壳满宽、不留边） */
  padding: 0 var(--dh-space-5);
}

.dh-brand {
  display: flex;
  align-items: center;
  gap: var(--dh-space-2);
  color: var(--dh-ink);
  min-width: 0;
}

.dh-brand:hover {
  color: var(--dh-ink);
  text-decoration: none;
}

.dh-brand__mark {
  width: 22px;
  height: 22px;
  flex: none;
  stroke: currentColor;
}

.dh-brand__name {
  font-family: var(--dh-serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .01em;
}

.dh-brand__sep {
  width: 1px;
  height: 14px;
  background: var(--dh-line-strong);
}

.dh-brand__sub {
  font-size: var(--dh-text-sm);
  color: var(--dh-ink-2);
  letter-spacing: .18em;
  white-space: nowrap;
}

.dh-version {
  padding: 1px 6px;
  border: 1px solid var(--dh-line-strong);
  border-radius: var(--dh-radius-sm);
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.5;
}

.dh-header__nav {
  display: flex;
  align-items: center;
  gap: var(--dh-space-5);
  margin-left: auto;
}

.dh-header__link {
  position: relative;
  padding: 6px 0;
  color: var(--dh-ink-2);
  font-size: var(--dh-text-sm);
  letter-spacing: .12em;
  white-space: nowrap;
}

.dh-header__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--dh-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dh-duration) var(--dh-ease);
}

.dh-header__link:hover {
  color: var(--dh-ink);
  text-decoration: none;
}

.dh-header__link:hover::after,
.dh-header__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.dh-header__link[aria-current="page"] {
  color: var(--dh-ink);
  font-weight: 600;
}

.dh-drawer-toggle {
  display: none;
  margin-left: calc(var(--dh-space-3) * -1);
}

/* --------------------------------------------------------------------------
   04. 三栏骨架
   -------------------------------------------------------------------------- */
.dh-shell {
  display: grid;
  grid-template-columns: var(--dh-sidebar-w) minmax(0, 1fr);
  max-width: var(--dh-container);
  margin: 0 auto;
  padding: 0;
  align-items: start;
}

.dh-shell--article {
  grid-template-columns: var(--dh-sidebar-w) minmax(0, 1fr) var(--dh-toc-w);
}

.dh-main {
  min-width: 0;
  /* 左右内距改由主栏自己持有（外壳满宽），与 A 套 264 · 956 · 220 同构 */
  padding: var(--dh-space-7) var(--dh-space-7) var(--dh-space-8);
}

.dh-main__inner {
  /* 无右栏页（首页/目录/占位）铺满主栏；正文页由 --dh-content-w 单独收窄 */
  max-width: none;
}

.dh-main--article .dh-main__inner {
  max-width: var(--dh-content-w);
}

/* --------------------------------------------------------------------------
   05. 文档树：去掉卡片感，只用 1px 线与字距
   -------------------------------------------------------------------------- */
.dh-sidebar {
  position: sticky;
  top: var(--dh-header-h);
  align-self: start;
  max-height: calc(100dvh - var(--dh-header-h));
  overflow-y: auto;
  /* 外壳无内距，左内侧 24 由侧栏自己给；右 16 给 1px 边线留白 */
  padding: var(--dh-space-6) var(--dh-space-4) var(--dh-space-7) var(--dh-space-5);
  border-right: var(--dh-hairline);
  font-size: var(--dh-text-sm);
}

.dh-sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--dh-space-2);
}

.dh-sidebar__title {
  font-family: var(--dh-serif);
  font-size: var(--dh-text-md);
  font-weight: 600;
  letter-spacing: .02em;
}

.dh-sidebar__close {
  display: none;
}

.dh-sidebar__meta {
  margin-top: var(--dh-space-1);
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  letter-spacing: .06em;
}

.dh-tree {
  margin-top: var(--dh-space-5);
}

.dh-tree__group,
.dh-tree__sub {
  border-top: var(--dh-hairline);
}

.dh-tree__sub {
  border-top: 0;
}

.dh-tree__group > summary,
.dh-tree__sub > summary {
  display: flex;
  align-items: center;
  gap: var(--dh-space-2);
  padding: 11px 0;
  color: var(--dh-ink);
  font-family: var(--dh-serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  cursor: pointer;
  list-style: none;
  transition: color var(--dh-duration) var(--dh-ease);
}

.dh-tree__sub > summary {
  padding: 7px 0 7px var(--dh-space-3);
  font-size: var(--dh-text-sm);
  color: var(--dh-ink-2);
}

.dh-tree__group > summary::-webkit-details-marker,
.dh-tree__sub > summary::-webkit-details-marker,
.dh-toc-fold > summary::-webkit-details-marker {
  display: none;
}

.dh-tree__group > summary:hover,
.dh-tree__sub > summary:hover {
  color: var(--dh-accent);
}

/* 折叠标记：一条竖线 + 横线，展开时只留横线 */
.dh-tree__chev {
  position: relative;
  width: 10px;
  height: 10px;
  flex: none;
}

.dh-tree__chev::before,
.dh-tree__chev::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: currentColor;
  transition: transform var(--dh-duration) var(--dh-ease);
}

.dh-tree__chev::before {
  width: 9px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.dh-tree__chev::after {
  width: 1px;
  height: 9px;
  transform: translate(-50%, -50%);
}

details[open] > summary > .dh-tree__chev::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.dh-tree__list {
  margin: 0;
  padding: 0 0 var(--dh-space-3) 18px;
  list-style: none;
}

.dh-tree__sub .dh-tree__list {
  padding-bottom: var(--dh-space-2);
  padding-left: 14px;
}

.dh-tree__link {
  display: block;
  padding: 5px 0 5px var(--dh-space-3);
  border-left: 1px solid transparent;
  color: var(--dh-ink-2);
  font-size: var(--dh-text-sm);
  line-height: 1.6;
  white-space: normal;
  transition: color var(--dh-duration) var(--dh-ease),
              border-color var(--dh-duration) var(--dh-ease);
}

.dh-tree__sub .dh-tree__link {
  padding-left: var(--dh-space-4);
}

.dh-tree__link:hover {
  color: var(--dh-ink);
  border-left-color: var(--dh-line-strong);
  text-decoration: none;
}

.dh-tree__link[aria-current="page"] {
  color: var(--dh-accent);
  border-left-color: var(--dh-accent);
  font-weight: 600;
}

.dh-tree__note {
  margin-top: var(--dh-space-5);
  padding-top: var(--dh-space-4);
  border-top: var(--dh-hairline);
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  line-height: 1.7;
}

.dh-backdrop {
  display: none;
}

/* --------------------------------------------------------------------------
   06. 首页：刊头式排布（大标题 + 字距小标 + 编号分组）
   -------------------------------------------------------------------------- */
.dh-intro {
  padding: var(--dh-space-8) 0 var(--dh-space-6);
  border-bottom: var(--dh-rule);
}

/* 刊头上方双细线，模仿报纸版面的眉线 */
.dh-intro::before {
  content: "";
  display: block;
  height: 5px;
  margin-bottom: var(--dh-space-6);
  border-top: var(--dh-rule);
  border-bottom: var(--dh-hairline);
}

.dh-intro__brand {
  display: block;
}

.dh-intro__mark {
  display: none;
}

.dh-intro__title {
  font-size: var(--dh-text-masthead);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.dh-intro__sub {
  margin-top: var(--dh-space-3);
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  letter-spacing: .24em;
  text-transform: uppercase;
}

.dh-intro__lede {
  max-width: 640px;
  margin-top: var(--dh-space-5);
  color: var(--dh-ink-2);
  font-family: var(--dh-serif);
  font-size: var(--dh-text-md);
  line-height: 1.8;
}

.dh-intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--dh-space-3);
  margin-top: var(--dh-space-6);
}

.dh-intro__hint {
  margin-top: var(--dh-space-4);
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  letter-spacing: .04em;
}

/* 快速入口：三栏，顶上一条墨线，无卡片底 */
.dh-quick {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-bottom: var(--dh-rule);
}

.dh-quick__item {
  display: block;
  padding: var(--dh-space-5) var(--dh-space-5) var(--dh-space-5) 0;
  border-top: 0;
  color: var(--dh-ink);
}

.dh-quick__item + .dh-quick__item {
  padding-left: var(--dh-space-5);
  border-left: var(--dh-hairline);
}

.dh-quick__item:hover {
  color: var(--dh-ink);
  text-decoration: none;
}

.dh-quick__item:hover .dh-quick__title {
  color: var(--dh-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.dh-quick__label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--dh-ink-3);
  font-size: 11px;
  letter-spacing: .18em;
}

.dh-quick__label .dh-icon {
  width: 14px;
  height: 14px;
}

.dh-quick__title {
  display: block;
  margin-top: 10px;
  font-family: var(--dh-serif);
  font-size: var(--dh-text-md);
  font-weight: 600;
  line-height: 1.4;
  transition: color var(--dh-duration) var(--dh-ease);
}

.dh-quick__desc {
  display: block;
  margin-top: 4px;
  color: var(--dh-ink-2);
  font-size: var(--dh-text-sm);
  line-height: 1.7;
}

/* 分区标题：衬线大字 + 小字说明，下面一条墨线 */
.dh-section {
  margin-top: var(--dh-space-8);
}

.dh-section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--dh-space-4);
  padding-bottom: var(--dh-space-3);
  border-bottom: var(--dh-rule);
}

.dh-section__title {
  font-size: var(--dh-text-lg);
  font-weight: 600;
  letter-spacing: .01em;
}

.dh-section__hint {
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  letter-spacing: .1em;
  white-space: nowrap;
}

/* 分组：2×2，用横线切分，无边框卡片 */
.dh-cats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: var(--dh-space-7);
  row-gap: 0;
}

.dh-cat {
  padding: var(--dh-space-5) 0 var(--dh-space-5);
  border-bottom: var(--dh-hairline);
}

.dh-cat__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--dh-space-3);
}

.dh-cat__title {
  font-size: 20px;
  font-weight: 600;
}

.dh-cat__index {
  margin-right: 10px;
  color: var(--dh-accent);
  font-family: var(--dh-latin);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .1em;
  vertical-align: 2px;
}

.dh-cat__count {
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: var(--dh-text-xs);
  letter-spacing: .08em;
  white-space: nowrap;
}

.dh-cat__list {
  margin: var(--dh-space-3) 0 0;
  padding: 0;
  list-style: none;
}

.dh-cat__link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 0;
  color: var(--dh-ink-2);
  font-size: 15px;
  line-height: 1.6;
  border-bottom: 1px dotted transparent;
}

/* 列表前的箭头缩到排版尺寸，避免喧宾夺主 */
.dh-cat__link .dh-icon {
  width: 10px;
  height: 10px;
  margin-top: 1px;
  color: var(--dh-line-strong);
  stroke-width: 2;
  transition: color var(--dh-duration) var(--dh-ease);
}

.dh-cat__link:hover .dh-icon {
  color: var(--dh-accent);
}

.dh-cat__link:hover {
  color: var(--dh-ink);
  text-decoration: none;
  border-bottom-color: var(--dh-line-strong);
}

.dh-cat__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--dh-space-3);
  color: var(--dh-accent);
  font-size: var(--dh-text-sm);
  letter-spacing: .04em;
}

.dh-cat__more .dh-icon {
  width: 14px;
  height: 14px;
  transition: transform var(--dh-duration) var(--dh-ease);
}

.dh-cat__more:hover {
  text-decoration: none;
  color: var(--dh-accent-deep);
}

.dh-cat__more:hover .dh-icon {
  transform: translateX(3px);
}

/* 空状态：整块留白 + 细框，不用插画 */
.dh-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  /* 正文列再宽，空状态块也不跟着拉满：留一点呼吸 */
  max-width: 680px;
  margin: var(--dh-space-7) auto 0;
  padding: var(--dh-space-8) var(--dh-space-5);
  border: var(--dh-hairline);
  background: var(--dh-paper-deep);
  text-align: center;
}

.dh-empty__icon {
  width: 40px;
  height: 40px;
  color: var(--dh-ink-3);
  fill: none;
  stroke: currentColor;
  stroke-width: 1.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.dh-empty__title {
  margin-top: var(--dh-space-4);
  font-size: var(--dh-text-lg);
  font-weight: 600;
}

.dh-empty__desc {
  max-width: 460px;
  margin-top: var(--dh-space-2);
  color: var(--dh-ink-2);
  font-size: 15px;
  line-height: 1.8;
}

.dh-empty__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--dh-space-4);
  margin-top: var(--dh-space-5);
}

.dh-demo-label {
  display: flex;
  align-items: center;
  gap: var(--dh-space-3);
  margin-top: var(--dh-space-8);
  color: var(--dh-ink-3);
  font-size: 11px;
  letter-spacing: .18em;
}

.dh-demo-label::before,
.dh-demo-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--dh-line);
}

/* --------------------------------------------------------------------------
   07. 目录页
   -------------------------------------------------------------------------- */
.dh-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  letter-spacing: .04em;
}

.dh-breadcrumb a {
  color: var(--dh-ink-2);
}

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

.dh-breadcrumb__sep {
  color: var(--dh-line-strong);
  font-family: var(--dh-latin);
}

.dh-page-head {
  padding: var(--dh-space-6) 0 var(--dh-space-5);
  border-bottom: var(--dh-rule);
}

.dh-page-head__eyebrow {
  color: var(--dh-accent);
  font-size: 11px;
  letter-spacing: .24em;
}

.dh-page-title {
  margin-top: var(--dh-space-2);
  font-size: var(--dh-text-3xl);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.dh-page-lede {
  max-width: 620px;
  margin-top: var(--dh-space-3);
  color: var(--dh-ink-2);
  font-family: var(--dh-serif);
  font-size: 18px;
  line-height: 1.8;
}

.dh-page-meta {
  margin-top: var(--dh-space-4);
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  letter-spacing: .08em;
}

/* 子目录：3 列，靠横线成表格感 */
.dh-dir-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 var(--dh-space-6);
  border-bottom: var(--dh-hairline);
}

.dh-dir {
  display: flex;
  gap: var(--dh-space-3);
  padding: var(--dh-space-5) 0;
  border-top: var(--dh-hairline);
  color: var(--dh-ink);
}

.dh-dir:hover {
  color: var(--dh-ink);
  text-decoration: none;
}

.dh-dir__icon {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  flex: none;
  color: var(--dh-ink-3);
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: color var(--dh-duration) var(--dh-ease);
}

.dh-dir:hover .dh-dir__icon {
  color: var(--dh-accent);
}

.dh-dir__body {
  min-width: 0;
}

.dh-dir__name {
  display: block;
  font-family: var(--dh-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  transition: color var(--dh-duration) var(--dh-ease);
}

.dh-dir:hover .dh-dir__name {
  color: var(--dh-accent);
}

.dh-dir__desc {
  display: block;
  margin-top: 2px;
  color: var(--dh-ink-2);
  font-size: var(--dh-text-sm);
  line-height: 1.65;
}

.dh-dir__meta {
  display: block;
  margin-top: 6px;
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: 11px;
  letter-spacing: .1em;
}

/* 文章列表 · 样式 A：标题 + 路径 + 摘要 + 右侧日期 */
.dh-doclist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.dh-doclist__item {
  border-bottom: var(--dh-hairline);
}

.dh-doclist__link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: var(--dh-space-6);
  padding: var(--dh-space-5) 0;
  color: var(--dh-ink);
}

.dh-doclist__link:hover {
  color: var(--dh-ink);
  text-decoration: none;
}

.dh-doclist__main {
  min-width: 0;
}

.dh-doclist__title {
  display: block;
  font-family: var(--dh-serif);
  font-size: var(--dh-text-md);
  font-weight: 600;
  line-height: 1.5;
  transition: color var(--dh-duration) var(--dh-ease);
}

.dh-doclist__link:hover .dh-doclist__title {
  color: var(--dh-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.dh-doclist__path {
  display: block;
  margin-top: 4px;
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: 11px;
  letter-spacing: .1em;
}

.dh-doclist__desc {
  display: block;
  margin-top: var(--dh-space-2);
  color: var(--dh-ink-2);
  font-size: 15px;
  line-height: 1.75;
}

.dh-doclist__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  padding-top: 3px;
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: 12px;
  letter-spacing: .06em;
  white-space: nowrap;
}

.dh-doclist__time {
  color: var(--dh-ink-3);
}

/* 文章列表 · 样式 B：紧凑索引（标题 / 路径 / 日期 三列对齐） */
/* 拆掉 __main 的盒子，让标题 / 路径 / 日期真正落在三列上 */
.dh-doclist--compact .dh-doclist__main {
  display: contents;
}

.dh-doclist--compact .dh-doclist__link {
  grid-template-columns: minmax(0, 1fr) 190px 96px;
  align-items: baseline;
  column-gap: var(--dh-space-4);
  padding: 14px 0;
}

.dh-doclist--compact .dh-doclist__title {
  font-size: 16px;
  font-weight: 500;
}

.dh-doclist--compact .dh-doclist__path {
  margin-top: 0;
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dh-doclist--compact .dh-doclist__time {
  text-align: right;
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: 12px;
  letter-spacing: .06em;
  white-space: nowrap;
}

/* 演示区块：虚线说明当前展示的是两种列表样式 */
.dh-demo-block {
  margin-top: var(--dh-space-7);
  padding: var(--dh-space-4) 0 0;
  border-top: var(--dh-hairline);
}

.dh-demo-block__note {
  margin-top: var(--dh-space-2);
  padding-left: var(--dh-space-4);
  border-left: 2px solid var(--dh-line-strong);
  color: var(--dh-ink-2);
  font-size: var(--dh-text-sm);
  line-height: 1.8;
}

.dh-inset {
  margin-top: var(--dh-space-6);
}

.dh-empty--compact {
  max-width: none;
  margin-top: var(--dh-space-5);
  margin-inline: 0;
  padding: var(--dh-space-6) var(--dh-space-5);
}

/* --------------------------------------------------------------------------
   08. 正文页
   -------------------------------------------------------------------------- */
.dh-article-head {
  padding: var(--dh-space-6) 0 var(--dh-space-5);
  border-bottom: var(--dh-rule);
}

.dh-article-head__kicker {
  color: var(--dh-accent);
  font-size: 11px;
  letter-spacing: .22em;
}

.dh-article-title {
  margin-top: var(--dh-space-3);
  font-size: var(--dh-text-3xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.18;
}

.dh-article-lede {
  margin-top: var(--dh-space-4);
  color: var(--dh-ink-2);
  font-family: var(--dh-serif);
  font-size: var(--dh-text-md);
  line-height: 1.8;
}

.dh-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--dh-space-2) var(--dh-space-5);
  margin-top: var(--dh-space-5);
  padding-top: var(--dh-space-3);
  border-top: var(--dh-hairline);
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: var(--dh-text-xs);
  letter-spacing: .06em;
}

.dh-article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.dh-article-meta .dh-icon {
  width: 14px;
  height: 14px;
  stroke-width: 1.5;
}

/* 正文排版：17px / 1.85，长文优先 */
.dh-prose {
  counter-reset: dh-h2;
  padding-top: var(--dh-space-6);
  font-size: var(--dh-text-base);
  line-height: var(--dh-leading-body);
  color: var(--dh-ink);
}

.dh-prose > * + * {
  margin-top: var(--dh-space-4);
}

.dh-prose p {
  color: var(--dh-ink);
}

/* 首字下沉：三行高。用 initial-letter 精确占位，不支持时自然退回普通首字 */
.dh-prose > p:first-of-type::first-letter {
  color: var(--dh-accent);
  font-family: var(--dh-serif);
  font-weight: 600;
  -webkit-initial-letter: 3;
  initial-letter: 3;
  margin-right: 10px;
}

.dh-prose strong {
  font-weight: 600;
}

.dh-prose em {
  font-family: var(--dh-serif);
  font-style: normal;
  border-bottom: 1px solid var(--dh-line-strong);
}

/* H2：编号 + 上墨线，章节感靠留白与编号建立 */
.dh-prose h2 {
  counter-increment: dh-h2;
  margin-top: var(--dh-space-8);
  padding-top: var(--dh-space-5);
  border-top: var(--dh-rule);
  font-size: var(--dh-text-xl);
  font-weight: 600;
  scroll-margin-top: 0;
}

.dh-prose h2::before {
  content: counter(dh-h2, decimal-leading-zero);
  display: block;
  margin-bottom: var(--dh-space-2);
  color: var(--dh-accent);
  font-family: var(--dh-latin);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
}

.dh-prose h3 {
  margin-top: var(--dh-space-6);
  font-size: var(--dh-text-lg);
  font-weight: 600;
}

.dh-prose h4 {
  margin-top: var(--dh-space-5);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .01em;
}

.dh-prose h2 + *,
.dh-prose h3 + *,
.dh-prose h4 + * {
  margin-top: var(--dh-space-3);
}

/* 章节锚点：默认淡，悬停加深 */
.dh-anchor {
  margin-left: 8px;
  color: var(--dh-accent);
  font-family: var(--dh-latin);
  font-size: .62em;
  font-weight: 400;
  opacity: .38;
  transition: opacity var(--dh-duration) var(--dh-ease);
}

.dh-anchor:hover,
h2:hover .dh-anchor,
h3:hover .dh-anchor {
  opacity: 1;
  text-decoration: none;
}

/* 列表：正文用衬线编号 + 细线分隔 */
.dh-prose ul,
.dh-prose ol {
  padding-left: 1.4em;
}

.dh-prose li + li {
  margin-top: 8px;
}

.dh-prose li::marker {
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: .92em;
}

.dh-prose ul ul,
.dh-prose ol ol,
.dh-prose ul ol,
.dh-prose ol ul {
  margin-top: 8px;
  padding-left: 1.2em;
}

/* 行内代码 */
.dh-prose code {
  padding: 1px 5px;
  border: var(--dh-hairline);
  border-radius: var(--dh-radius-sm);
  background: var(--dh-paper-deep);
  color: var(--dh-accent-deep);
  font-family: var(--dh-mono);
  font-size: .86em;
  word-break: break-word;
}

/* 引用：上下细线 + 大号衬线，不用左侧竖条 */
.dh-prose blockquote {
  margin: var(--dh-space-6) 0;
  padding: var(--dh-space-5) 0;
  border-top: var(--dh-hairline);
  border-bottom: var(--dh-hairline);
  font-family: var(--dh-serif);
  font-size: var(--dh-text-md);
  line-height: 1.8;
  color: var(--dh-ink);
}

.dh-prose blockquote p {
  margin: 0;
}

.dh-prose blockquote cite {
  display: block;
  margin-top: var(--dh-space-3);
  color: var(--dh-ink-3);
  font-family: var(--dh-sans);
  font-size: var(--dh-text-xs);
  font-style: normal;
  letter-spacing: .1em;
}

/* 信息块：提示=墨绿，注意=酒红，仅左侧 2px 语义色 */
.dh-callout {
  display: flex;
  gap: var(--dh-space-3);
  margin: var(--dh-space-5) 0;
  padding: var(--dh-space-4) var(--dh-space-5);
  border-left: 2px solid var(--dh-line-strong);
  background: var(--dh-paper-deep);
}

.dh-callout__icon {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.dh-callout__title {
  display: block;
  margin-bottom: 2px;
  font-size: var(--dh-text-xs);
  font-weight: 600;
  letter-spacing: .12em;
}

.dh-callout__body {
  font-size: 15px;
  line-height: 1.8;
  color: var(--dh-ink-2);
}

.dh-callout__body p {
  margin: 0;
  color: inherit;
}

.dh-callout--tip {
  border-left-color: var(--dh-green);
  background: var(--dh-green-soft);
  color: var(--dh-green);
}

.dh-callout--tip .dh-callout__body {
  color: #2C4A3E;
}

.dh-callout--note {
  border-left-color: var(--dh-accent);
  background: var(--dh-accent-soft);
  color: var(--dh-accent);
}

.dh-callout--note .dh-callout__body {
  color: #5A2A38;
}

/* 配图：直角细框，图注衬线 */
.dh-figure {
  margin: var(--dh-space-6) 0;
}

.dh-figure__frame {
  position: relative;
  display: block;
  border: var(--dh-hairline);
  background: var(--dh-card);
  transition: border-color var(--dh-duration) var(--dh-ease);
}

.dh-figure__frame:hover {
  border-color: var(--dh-line-strong);
}

.dh-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
}

.dh-figure__zoom {
  position: absolute;
  right: 0;
  bottom: 0;
  padding: 5px 10px;
  border-left: var(--dh-hairline);
  border-top: var(--dh-hairline);
  background: var(--dh-paper);
  color: var(--dh-ink-3);
  font-size: 11px;
  letter-spacing: .12em;
  opacity: 0;
  transition: opacity var(--dh-duration) var(--dh-ease);
}

.dh-figure__frame:hover .dh-figure__zoom,
.dh-figure__frame:focus-visible .dh-figure__zoom {
  opacity: 1;
}

.dh-figure figcaption {
  margin-top: var(--dh-space-3);
  padding-left: var(--dh-space-3);
  border-left: 1px solid var(--dh-line-strong);
  color: var(--dh-ink-2);
  font-family: var(--dh-serif);
  font-size: 14px;
  line-height: 1.75;
}

.dh-figure figcaption b {
  color: var(--dh-accent);
  font-family: var(--dh-latin);
  font-weight: 500;
  letter-spacing: .06em;
}

/* 表格：只有横线（booktabs 风格），无竖线无斑马 */
.dh-table-wrap {
  margin: var(--dh-space-6) 0;
  overflow-x: auto;
  border-top: var(--dh-rule);
  border-bottom: var(--dh-hairline);
}

.dh-table {
  width: 100%;
  /* 六列中文表头需要宽度，超出时由 .dh-table-wrap 自身横向滚动 */
  min-width: 860px;
  border-collapse: collapse;
  font-size: 15px;
}

.dh-table th,
.dh-table td {
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--dh-hairline);
}

.dh-table th {
  color: var(--dh-ink-3);
  font-family: var(--dh-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  white-space: nowrap;
  border-bottom: 1px solid var(--dh-ink);
}

.dh-table tbody tr:last-child td {
  border-bottom: 0;
}

.dh-table tbody tr:hover {
  background: var(--dh-paper-deep);
}

/* 代码块：米底细框 + 栏头，语法色只保留四类 */
.dh-code {
  margin: var(--dh-space-6) 0;
  border: var(--dh-hairline);
  border-radius: var(--dh-radius-sm);
  background: var(--dh-paper-deep);
  overflow: hidden;
}

.dh-code__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--dh-space-3);
  padding: 7px var(--dh-space-4);
  border-bottom: var(--dh-hairline);
  background: var(--dh-paper);
}

.dh-code__lang {
  color: var(--dh-ink-3);
  font-family: var(--dh-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

/* 复制依赖脚本，无 JS 时按钮不出现（避免死控件） */
.dh-code__copy {
  display: none;
  align-items: center;
  gap: 5px;
  min-height: 28px;
  padding: 0 8px;
  border: 1px solid transparent;
  border-radius: var(--dh-radius-sm);
  background: transparent;
  color: var(--dh-ink-3);
  font-size: 11px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: color var(--dh-duration) var(--dh-ease),
              border-color var(--dh-duration) var(--dh-ease);
}

.dh-code__copy .dh-icon {
  width: 14px;
  height: 14px;
}

.dh-js .dh-code__copy {
  display: inline-flex;
}

.dh-code__copy:hover {
  color: var(--dh-ink);
  border-color: var(--dh-line-strong);
}

.dh-code pre {
  margin: 0;
  padding: var(--dh-space-4) var(--dh-space-5);
  overflow-x: auto;
}

.dh-code code {
  display: block;
  min-width: max-content;
  padding: 0;
  border: 0;
  background: none;
  color: var(--dh-ink);
  font-family: var(--dh-mono);
  font-size: 13px;
  line-height: 1.75;
  white-space: pre;
}

.tok-c {
  color: var(--dh-ink-3);
  font-style: italic;
}

.tok-k {
  color: var(--dh-accent);
}

.tok-s {
  color: var(--dh-green);
}

.tok-n {
  color: #7A5A1C;
}

/* --------------------------------------------------------------------------
   09. 本页目录：右栏细线栏 + 移动端折叠区
   -------------------------------------------------------------------------- */
.dh-toc {
  position: sticky;
  top: var(--dh-header-h);
  align-self: start;
  max-height: calc(100dvh - var(--dh-header-h));
  overflow-y: auto;
  /* 右内侧 24 对齐页头；左 16 让 1px 边线与文字有呼吸 */
  padding: var(--dh-space-7) var(--dh-space-5) var(--dh-space-6) var(--dh-space-4);
  border-left: var(--dh-hairline);
  font-size: var(--dh-text-sm);
}

.dh-toc__title {
  color: var(--dh-ink-3);
  font-size: 11px;
  letter-spacing: .2em;
}

.dh-toc__list {
  margin: var(--dh-space-3) 0 0;
  padding: 0;
  list-style: none;
}

.dh-toc__item {
  margin: 0;
}

.dh-toc__link {
  display: block;
  padding: 5px 0;
  color: var(--dh-ink-2);
  font-size: var(--dh-text-sm);
  line-height: 1.6;
  transition: color var(--dh-duration) var(--dh-ease);
}

.dh-toc__link:hover {
  color: var(--dh-ink);
  text-decoration: none;
}

.dh-toc__link[aria-current="true"] {
  color: var(--dh-accent);
  font-weight: 600;
}

.dh-toc__list--sub {
  margin: 2px 0 4px;
  padding-left: var(--dh-space-3);
  border-left: 1px solid var(--dh-line);
}

.dh-toc__list--sub .dh-toc__link {
  font-size: 12.5px;
  padding: 3px 0;
  color: var(--dh-ink-3);
}

.dh-toc__foot {
  margin-top: var(--dh-space-4);
  padding-top: var(--dh-space-3);
  border-top: var(--dh-hairline);
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: 11px;
  letter-spacing: .08em;
}

.dh-toc__empty {
  margin-top: var(--dh-space-3);
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  line-height: 1.7;
}

/* 移动端折叠目录，桌面隐藏 */
.dh-toc-fold {
  display: none;
  margin-bottom: var(--dh-space-5);
  border-top: var(--dh-hairline);
  border-bottom: var(--dh-hairline);
}

.dh-toc-fold > summary {
  display: flex;
  align-items: center;
  gap: var(--dh-space-2);
  padding: 11px 0;
  color: var(--dh-ink);
  font-size: var(--dh-text-sm);
  font-weight: 600;
  letter-spacing: .06em;
  cursor: pointer;
  list-style: none;
}

.dh-toc-fold__body {
  padding-bottom: var(--dh-space-3);
}

.dh-toc-fold__body .dh-toc__list {
  margin-top: 0;
}

/* --------------------------------------------------------------------------
   10. 页脚、回到顶部、灯箱、预览条
   -------------------------------------------------------------------------- */
.dh-footer {
  border-top: var(--dh-rule);
  background: var(--dh-paper);
}

.dh-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--dh-space-6);
  max-width: var(--dh-container);
  margin: 0 auto;
  padding: var(--dh-space-7) var(--dh-space-5) var(--dh-space-6);
}

.dh-footer__name {
  display: flex;
  align-items: center;
  gap: var(--dh-space-2);
  font-family: var(--dh-serif);
  font-size: 17px;
  font-weight: 600;
}

.dh-footer__name .dh-brand__mark {
  width: 18px;
  height: 18px;
}

.dh-footer__note {
  max-width: 460px;
  margin-top: var(--dh-space-2);
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  line-height: 1.8;
}

.dh-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--dh-space-2) var(--dh-space-5);
  align-content: start;
  font-size: var(--dh-text-sm);
}

.dh-footer__links a {
  color: var(--dh-ink-2);
}

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

.dh-footer__demo {
  padding: 0;
  border: 0;
  background: none;
  color: var(--dh-ink-3);
  font-size: var(--dh-text-xs);
  text-decoration: underline;
  text-decoration-style: dashed;
  text-underline-offset: 3px;
  cursor: pointer;
}

.dh-footer__demo:hover {
  color: var(--dh-accent);
}

/* 演示开关由脚本驱动，无 JS 时不渲染（避免点不动的控件） */
.dh-footer__demo {
  display: none;
}

.dh-js .dh-footer__demo {
  display: inline-flex;
}

.dh-footer__bottom {
  border-top: var(--dh-hairline);
}

.dh-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--dh-space-2) var(--dh-space-5);
  max-width: var(--dh-container);
  margin: 0 auto;
  /* 右侧留出 48px，避免与固定「回到顶部」按钮重叠 */
  padding: var(--dh-space-3) calc(var(--dh-space-5) + 48px) var(--dh-space-3) var(--dh-space-6);
  color: var(--dh-ink-3);
  font-family: var(--dh-latin);
  font-size: 11px;
  letter-spacing: .08em;
}

.dh-to-top {
  position: fixed;
  right: var(--dh-space-5);
  bottom: var(--dh-space-5);
  z-index: 55;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--dh-tap);
  height: var(--dh-tap);
  padding: 0;
  border: 1px solid var(--dh-ink);
  border-radius: var(--dh-radius);
  background: var(--dh-paper);
  color: var(--dh-ink);
  cursor: pointer;
  transition: background var(--dh-duration) var(--dh-ease),
              color var(--dh-duration) var(--dh-ease);
}

.dh-to-top:hover {
  background: var(--dh-ink);
  color: var(--dh-paper);
}

/* hidden 属性优先级要压过 display:inline-flex */
.dh-to-top[hidden] {
  display: none;
}

.dh-lightbox {
  width: 100%;
  max-width: none;
  height: 100%;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  background: #17150F;
  color: var(--dh-paper);
}

.dh-lightbox::backdrop {
  background: rgba(18, 16, 12, .72);
}

.dh-lightbox__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--dh-space-4);
  padding: var(--dh-space-3) var(--dh-space-5);
  border-bottom: 1px solid rgba(251, 248, 243, .14);
}

.dh-lightbox__caption {
  color: var(--dh-paper);
  font-family: var(--dh-serif);
  font-size: var(--dh-text-sm);
  letter-spacing: .04em;
}

.dh-lightbox .dh-icon-btn {
  color: rgba(251, 248, 243, .72);
}

.dh-lightbox .dh-icon-btn:hover {
  color: var(--dh-paper);
}

.dh-lightbox__body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: calc(100% - 57px);
  padding: var(--dh-space-5);
}

.dh-lightbox__img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  background: var(--dh-paper);
}

.dh-preview-bar {
  background: var(--dh-ink);
  color: var(--dh-paper);
}

.dh-preview-bar[hidden] {
  display: none !important;
}

.dh-preview-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--dh-space-2) var(--dh-space-4);
  max-width: var(--dh-container);
  margin: 0 auto;
  padding: 9px var(--dh-space-5);
  font-size: var(--dh-text-xs);
  letter-spacing: .06em;
}

.dh-preview-bar__label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.dh-preview-bar .dh-icon {
  width: 14px;
  height: 14px;
}

.dh-preview-bar__inner > span:last-child {
  color: rgba(251, 248, 243, .64);
}

/* --------------------------------------------------------------------------
   11. 响应式：1280 / 1024 / 768 / 375
   -------------------------------------------------------------------------- */
@media (max-width: 1280px) {
  :root {
    --dh-sidebar-w: 244px;
    --dh-toc-w: 208px;
    --dh-text-masthead: 54px;
    --dh-text-3xl: 40px;
  }
}

@media (max-width: 1024px) {
  :root {
    --dh-content-w: 820px;
    --dh-text-masthead: 46px;
    --dh-text-3xl: 36px;
    --dh-text-2xl: 30px;
  }

  /* 左栏转为抽屉后不再占栅格轨道，骨架统一收敛为单列；此时正文铺满可用宽度 */
  .dh-shell,
  .dh-shell--article {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 单列下：目录/占位页铺满可用宽；正文列仍锁 820（约 47 字/行），避免长行 */
  .dh-main__inner {
    max-width: none;
  }

  .dh-main--article .dh-main__inner {
    max-width: var(--dh-content-w);
    margin-inline: auto;
  }

  .dh-toc {
    display: none;
  }

  .dh-toc-fold {
    display: block;
  }

  /* 单列：外壳不再留边，内距由主栏自己给（与 1440 同一套机制） */
  .dh-main {
    padding: var(--dh-space-6) var(--dh-space-5) var(--dh-space-8);
  }

  /* 左目录改为抽屉：仅在 JS 可用时移出视口并显示开关 */
  .dh-js .dh-drawer-toggle {
    display: inline-flex;
  }

  /* 无 JS 时：目录留在文档流顶部，整块可读，不出现死开关 */
  .dh-sidebar {
    position: static;
    max-height: none;
    overflow: visible;
    padding: var(--dh-space-5);
    border-right: 0;
    border-bottom: var(--dh-rule);
  }

  .dh-js .dh-sidebar {
    position: fixed;
    top: var(--dh-header-h);
    left: 0;
    z-index: 70;
    width: 300px;
    max-width: 86vw;
    height: calc(100dvh - var(--dh-header-h));
    max-height: none;
    padding: var(--dh-space-5) var(--dh-space-5) var(--dh-space-7);
    border-right: 1px solid var(--dh-ink);
    background: var(--dh-paper);
    transform: translateX(-100%);
    transition: transform 180ms var(--dh-ease);
    will-change: transform;
  }

  .dh-js .dh-sidebar__close {
    display: inline-flex;
  }

  .dh-js body[data-drawer-open="true"] .dh-sidebar {
    transform: none;
  }

  body[data-drawer-open="true"] .dh-backdrop {
    display: block;
    position: fixed;
    inset: var(--dh-header-h) 0 0;
    z-index: 65;
    padding: 0;
    border: 0;
    background: rgba(18, 16, 12, .38);
    cursor: pointer;
  }

  body.dh-no-scroll {
    overflow: hidden;
  }

  .dh-shell,
  .dh-shell--article {
    padding-left: 0;
    padding-right: 0;
  }

  .dh-cats {
    column-gap: var(--dh-space-6);
  }
}

@media (max-width: 768px) {
  :root {
    --dh-text-masthead: 38px;
    --dh-text-3xl: 30px;
    --dh-text-2xl: 26px;
    --dh-text-xl: 23px;
    --dh-text-base: 16.5px;
    --dh-header-h: 56px;
  }

  .dh-header__inner {
    gap: var(--dh-space-2);
    min-height: var(--dh-header-h);
    padding: 0 var(--dh-space-4);
  }

  .dh-brand__sub,
  .dh-brand__sep {
    display: none;
  }

  .dh-header__nav {
    gap: var(--dh-space-4);
  }

  .dh-header__link {
    font-size: var(--dh-text-xs);
    letter-spacing: .06em;
  }

  .dh-shell,
  .dh-shell--article {
    padding-left: 0;
    padding-right: 0;
  }

  .dh-footer__inner,
  .dh-sidebar {
    padding-left: var(--dh-space-4);
    padding-right: var(--dh-space-4);
  }

  .dh-main {
    padding: var(--dh-space-5) var(--dh-space-4) var(--dh-space-7);
  }

  .dh-intro {
    padding-top: var(--dh-space-6);
  }

  .dh-intro::before {
    margin-bottom: var(--dh-space-5);
  }

  .dh-intro__lede {
    font-size: 17px;
  }

  .dh-intro__actions .dh-btn {
    padding: 0 var(--dh-space-4);
  }

  /* 快速入口改单列，靠横线分隔 */
  .dh-quick {
    grid-template-columns: minmax(0, 1fr);
  }

  .dh-quick__item {
    padding: var(--dh-space-4) 0;
  }

  .dh-quick__item + .dh-quick__item {
    padding-left: 0;
    border-left: 0;
    border-top: var(--dh-hairline);
  }

  .dh-section {
    margin-top: var(--dh-space-6);
  }

  .dh-cats,
  .dh-dir-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .dh-dir {
    padding: var(--dh-space-4) 0;
  }

  .dh-empty {
    padding: var(--dh-space-6) var(--dh-space-4);
  }

  .dh-article-title {
    font-size: 28px;
  }

  .dh-article-lede {
    font-size: 16.5px;
  }

  .dh-prose {
    font-size: 16.5px;
  }

  .dh-prose h2 {
    margin-top: var(--dh-space-7);
    font-size: 22px;
  }

  .dh-prose h3 {
    font-size: 19px;
  }

  .dh-prose blockquote {
    font-size: 17px;
  }

  /* ---- M1 触控目标：窄屏一律 ≥ 44px（工厂硬约束，不随风格放宽） ---- */
  .dh-brand,
  .dh-header__link,
  .dh-tree__group > summary,
  .dh-tree__sub > summary,
  .dh-tree__link,
  .dh-toc__link,
  .dh-cat__link,
  .dh-footer__links a {
    display: flex;
    align-items: center;
    min-height: var(--dh-tap);
  }

  .dh-js .dh-footer__demo {
    display: inline-flex;
    align-items: center;
    min-height: var(--dh-tap);
  }

  /* 文档列表本身是栅格，只抬最小高度，不改 display */
  .dh-doclist__link {
    min-height: var(--dh-tap);
  }

  .dh-toc__list--sub .dh-toc__link {
    min-height: 38px;
  }

  .dh-code__copy {
    min-height: var(--dh-tap);
  }

  .dh-figure__zoom {
    display: none;
  }

  .dh-code pre {
    padding: var(--dh-space-3) var(--dh-space-4);
  }

  .dh-code code {
    font-size: 12.5px;
  }

  /* 紧凑列表在窄屏退回两行：标题 + 日期 / 路径 */
  .dh-doclist--compact .dh-doclist__link {
    grid-template-columns: minmax(0, 1fr) auto;
    row-gap: 4px;
  }

  .dh-doclist--compact .dh-doclist__path {
    grid-column: 1;
    grid-row: 2;
  }

  .dh-doclist--compact .dh-doclist__time {
    grid-column: 2;
    grid-row: 1;
    font-size: 11px;
  }

  .dh-doclist__meta {
    font-size: 11px;
  }

  .dh-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--dh-space-5);
    padding-top: var(--dh-space-6);
  }

  .dh-footer__links {
    gap: var(--dh-space-2) var(--dh-space-4);
  }

  /* 窄屏保留回到顶部的右侧让位，避免遮挡版权行 */
  .dh-footer__bottom-inner {
    padding: var(--dh-space-3) calc(var(--dh-space-4) + 44px) var(--dh-space-3) var(--dh-space-4);
  }

  .dh-to-top {
    right: var(--dh-space-3);
    bottom: var(--dh-space-3);
  }

  .dh-preview-bar__inner {
    padding: 8px var(--dh-space-4);
    font-size: 11px;
  }
}

@media (max-width: 480px) {
  .dh-header__nav .dh-header__link:nth-child(3) {
    display: none;
  }

  .dh-page-title,
  .dh-article-title {
    font-size: 26px;
  }

  /* 首字下沉：移动端交给 initial-letter 的 drops 值自动缩放，不再覆盖 font-size */
  .dh-prose > p:first-of-type::first-letter {
    -webkit-initial-letter: 2;
    initial-letter: 2;
  }

  .dh-article-meta {
    gap: var(--dh-space-1) var(--dh-space-4);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}