/* ========================================================================
   长文阅读样式表 · v2
   - 浅色主题，中英文混排优化
   - ≥1024px：左侧固定 TOC + 右侧主内容
   - 仅 CSS，不改 HTML 结构
   ======================================================================== */

:root {
  --bg:            #faf8f3;
  --bg-elev:      #ffffff;
  --bg-sidebar:   #f1ede5;
  --bg-soft:      #f5f1e9;

  --text:         #1d1d1f;
  --text-strong:  #0a0a0c;
  --text-muted:   #5a5d63;
  --text-subtle:  #8a8d93;

  --border:       #e6e1d6;
  --border-soft:  #efeae0;
  --border-strong:#d6d0c2;

  --accent:       #b85c00;       /* 暖橙 — 配合米白背景的中式书卷感 */
  --accent-soft:  #fdecd9;
  --accent-deep:  #8a4500;

  --link:         #0d6cad;
  --link-hover:   #0a5285;

  --code-bg:      #1e2127;
  --code-text:    #d8dde6;
  --code-border:  #2c3038;
  --inline-bg:    #f1ece1;
  --inline-fg:    #a4421a;

  --quote-bar:    var(--accent);
  --quote-bg:     #fbf3e7;

  --shadow-sm:    0 1px 2px rgba(60, 50, 30, 0.04);
  --shadow-md:    0 2px 8px rgba(60, 50, 30, 0.06), 0 1px 2px rgba(60, 50, 30, 0.04);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
  background: var(--bg);
}

body {
  font-family:
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC",
    "SF Pro Text", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern", "liga", "calt", "tnum";
  font-variant-numeric: tabular-nums;
  text-spacing-trim: trim-start;
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 32px 120px;
  word-wrap: break-word;
  hanging-punctuation: allow-end last;
}

/* 全局 selection */
::selection {
  background: var(--accent-soft);
  color: var(--accent-deep);
}

/* ---------- 标题 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family:
    "PingFang SC", "Hiragino Sans GB",
    "Source Han Sans SC", "Noto Sans CJK SC",
    "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 600;
  line-height: 1.32;
  color: var(--text-strong);
  letter-spacing: -0.005em;
  scroll-margin-top: 24px;
  position: relative;
}

h1 {
  font-size: 2em;
  margin: 0.4em 0 0.7em;
  padding-bottom: 0.4em;
  letter-spacing: -0.015em;
  font-weight: 700;
  border-bottom: 1px solid var(--border-strong);
}

h2 {
  font-size: 1.46em;
  margin: 2.2em 0 0.7em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.008em;
}

h3 {
  font-size: 1.2em;
  margin: 1.8em 0 0.6em;
  color: var(--text-strong);
}

h4 {
  font-size: 1.06em;
  margin: 1.5em 0 0.5em;
  color: var(--text);
}

h5 {
  font-size: 1em;
  margin: 1.3em 0 0.4em;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

h6 {
  font-size: 0.94em;
  margin: 1.2em 0 0.4em;
  color: var(--text-subtle);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* hover 时显示锚点 */
h1[id], h2[id], h3[id], h4[id] {
  scroll-margin-top: 32px;
}
h1[id]:hover::after,
h2[id]:hover::after,
h3[id]:hover::after,
h4[id]:hover::after {
  content: "§";
  position: absolute;
  left: -0.9em;
  top: 0;
  color: var(--text-subtle);
  font-weight: 400;
  opacity: 0.6;
}

/* ---------- 段落与文本 ---------- */
p {
  margin: 0.75em 0;
  hyphens: auto;
}

strong, b {
  color: var(--text-strong);
  font-weight: 600;
}

em, i {
  color: var(--text);
  font-style: italic;
}

small {
  font-size: 0.88em;
  color: var(--text-muted);
}

/* ---------- 链接 ---------- */
a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid rgba(13, 108, 173, 0.22);
  transition: border-color 0.15s ease, color 0.15s ease;
  word-break: break-word;
}
a:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* ---------- 行内代码 ---------- */
code {
  font-family:
    "JetBrains Mono", "SF Mono", "Menlo", "Consolas",
    "Roboto Mono", "Liberation Mono", monospace;
  font-size: 0.85em;
  background: var(--inline-bg);
  color: var(--inline-fg);
  padding: 0.12em 0.42em;
  border-radius: 4px;
  white-space: nowrap;
  font-feature-settings: "calt" 0, "liga" 0;
}

a code { color: inherit; }

/* ---------- 代码块 ---------- */
pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1.05em 1.25em;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.85em;
  line-height: 1.62;
  margin: 1.1em 0;
  border: 1px solid var(--code-border);
  box-shadow: var(--shadow-sm);
  position: relative;
}

pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  white-space: pre;
  font-feature-settings: "calt" 0;
}

/* pandoc tango 高亮在深色块上的可读性微调 */
pre .kw, pre .cf, pre .op { color: #c39bd3; }
pre .st, pre .ch, pre .vs { color: #f5b461; }
pre .co                   { color: #6c7a89; font-style: italic; }
pre .dv, pre .fl, pre .bn { color: #f6bd60; }
pre .fu                   { color: #7fb8e6; }
pre .va                   { color: #e2e2e2; }
pre .at                   { color: #f5b461; }
pre .er                   { color: #ff6b6b; }

/* 滚动条 */
pre::-webkit-scrollbar { height: 8px; }
pre::-webkit-scrollbar-thumb {
  background: #3a3f48;
  border-radius: 4px;
}
pre::-webkit-scrollbar-thumb:hover { background: #4d535e; }

/* ---------- 引用 ---------- */
blockquote {
  border-left: 3px solid var(--quote-bar);
  background: var(--quote-bg);
  padding: 0.7em 1.1em;
  margin: 1.2em 0;
  color: var(--text-muted);
  border-radius: 0 6px 6px 0;
  font-style: normal;
}

blockquote p { margin: 0.35em 0; }

blockquote :first-child { margin-top: 0; }
blockquote :last-child { margin-bottom: 0; }

/* ---------- 列表 ---------- */
ul, ol {
  padding-left: 1.6em;
  margin: 0.7em 0;
}

ul { list-style-type: disc; }
ul ul { list-style-type: circle; }
ul ul ul { list-style-type: square; }

li {
  margin: 0.3em 0;
}

li::marker { color: var(--accent); }

li > ul,
li > ol {
  margin: 0.3em 0;
}

li p { margin: 0.4em 0; }

dt { font-weight: 600; color: var(--text-strong); margin-top: 0.6em; }
dd { margin: 0.2em 0 0.6em 1.4em; color: var(--text-muted); }

/* ---------- 表格 ---------- */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.4em 0;
  font-size: 0.94em;
  background: var(--bg-elev);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

th, td {
  padding: 0.6em 0.85em;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border-soft);
}

th {
  background: var(--bg-soft);
  font-weight: 600;
  color: var(--text-strong);
  border-bottom: 1px solid var(--border-strong);
  font-size: 0.95em;
  letter-spacing: 0.01em;
}

tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--bg-soft); }

/* 表格内代码缩小 */
td code, th code { font-size: 0.92em; }

/* 表格容器（如果有 .table-wrapper 可滚） */
.table-wrapper { overflow-x: auto; }

/* ---------- 分隔 ---------- */
hr {
  border: none;
  height: 1px;
  background: linear-gradient(
    to right,
    transparent 0%,
    var(--border-strong) 20%,
    var(--border-strong) 80%,
    transparent 100%
  );
  margin: 2.6em 0;
}

/* ---------- 图片 ---------- */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.3em auto;
  border-radius: 6px;
}

figure {
  margin: 1.4em 0;
  text-align: center;
}
figcaption {
  font-size: 0.88em;
  color: var(--text-muted);
  margin-top: 0.5em;
}

/* ---------- 数学公式 ---------- */
.math.display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.4em 0;
  margin: 0.8em 0;
}
.math.inline { padding: 0 0.1em; }

/* ---------- 脚注 ---------- */
.footnote-ref a, a.footnote-ref {
  border: none;
  font-size: 0.78em;
  vertical-align: super;
  padding: 0 0.15em;
  color: var(--accent);
}
.footnotes {
  font-size: 0.92em;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 4em;
  padding-top: 1.5em;
}
.footnotes hr { display: none; }
.footnotes ol { padding-left: 1.4em; }

/* ---------- TOC（默认 / 窄屏：内联卡片） ---------- */
nav#TOC {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1em 1.4em;
  margin: 1.5em 0 2.5em;
  font-size: 0.94em;
  box-shadow: var(--shadow-sm);
}

nav#TOC > ul { margin: 0; padding-left: 1.2em; }
nav#TOC ul ul { font-size: 0.96em; }
nav#TOC a {
  border-bottom: none;
  color: var(--text);
}
nav#TOC a:hover { color: var(--accent); }

/* ---------- 标题块（如有） ---------- */
header#title-block-header {
  margin-bottom: 2em;
  padding-bottom: 1em;
  border-bottom: 2px solid var(--text-strong);
}
header#title-block-header .title {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
}
header#title-block-header .author,
header#title-block-header .date {
  color: var(--text-muted);
  font-size: 0.95em;
  margin: 0.2em 0;
}

/* ========================================================================
   宽屏（≥1024px）：左侧固定 TOC，主内容定宽
   ======================================================================== */
@media (min-width: 1024px) {
  body {
    max-width: 800px;
    margin: 0;
    margin-left: 320px;
    padding: 64px 64px 120px;
  }

  nav#TOC {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 300px;
    overflow-y: auto;
    overscroll-behavior: contain;
    margin: 0;
    padding: 32px 16px 32px 28px;
    background: var(--bg-sidebar);
    border: none;
    border-right: 1px solid var(--border);
    border-radius: 0;
    font-size: 0.88em;
    line-height: 1.55;
    box-shadow: none;
  }

  nav#TOC::before {
    content: "目录";
    display: block;
    font-size: 0.72em;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--text-subtle);
    padding-bottom: 0.9em;
    margin-bottom: 0.8em;
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
  }

  nav#TOC > ul {
    padding-left: 0;
    margin: 0;
    list-style: none;
  }

  nav#TOC ul ul {
    padding-left: 0.95em;
    font-size: 0.96em;
    list-style: none;
    margin: 0.1em 0 0.4em;
    border-left: 1px solid var(--border);
    margin-left: 0.5em;
  }

  nav#TOC li {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  /* 含子节点的 li：箭头 + 链接同行，嵌套 ul 换行 */
  nav#TOC li.has-children {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
  }
  nav#TOC li.has-children > .toc-arrow { flex: 0 0 auto; }
  nav#TOC li.has-children > a {
    flex: 1 1 0;
    min-width: 0;
  }
  nav#TOC li.has-children > ul { flex: 0 0 100%; }

  nav#TOC a {
    display: block;
    padding: 3px 8px 3px 10px;
    margin: 1px 0;
    border-radius: 4px;
    border: none;
    color: var(--text-muted);
    transition: background 0.12s ease, color 0.12s ease;
    line-height: 1.45;
  }

  nav#TOC > ul > li > a {
    color: var(--text);
    font-weight: 500;
  }

  nav#TOC a:hover {
    background: var(--bg-elev);
    color: var(--accent);
  }

  /* 一级（章）右侧加细线分隔 */
  nav#TOC > ul > li {
    margin-top: 0.45em;
    padding-top: 0.45em;
    border-top: 1px solid var(--border);
  }
  nav#TOC > ul > li:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
  }

  /* 默认折叠章内子目录（第 3 层 ul） */
  nav#TOC > ul > li > ul > li > ul {
    display: none;
    margin-top: 0.15em;
    margin-bottom: 0.3em;
  }
  nav#TOC > ul > li > ul > li.toc-expanded > ul {
    display: block;
  }

  /* 章节标题前的折叠箭头（JS 注入） */
  .toc-arrow {
    display: inline-block;
    width: 1em;
    margin-left: -0.6em;
    margin-right: 0.15em;
    text-align: center;
    color: var(--text-subtle);
    font-size: 0.65em;
    cursor: pointer;
    user-select: none;
    transition: transform 0.15s ease, color 0.15s ease;
    vertical-align: 1px;
  }
  .toc-arrow:hover { color: var(--accent); }
  li.toc-expanded > .toc-arrow {
    transform: rotate(90deg);
    color: var(--accent);
  }
  /* 没箭头的章节（如 Executive Summary）做对齐占位 */
  nav#TOC > ul > li > ul > li:not(.has-children) > a {
    padding-left: 1.15em;
  }

  /* TOC 滚动条 */
  nav#TOC::-webkit-scrollbar { width: 6px; }
  nav#TOC::-webkit-scrollbar-track { background: transparent; }
  nav#TOC::-webkit-scrollbar-thumb {
    background: rgba(60, 50, 30, 0.18);
    border-radius: 3px;
  }
  nav#TOC::-webkit-scrollbar-thumb:hover {
    background: rgba(60, 50, 30, 0.32);
  }
}

/* 超宽屏 ≥1440px：稍微给主内容更多呼吸 */
@media (min-width: 1440px) {
  body {
    max-width: 880px;
    margin-left: 360px;
    padding: 72px 72px 140px;
    font-size: 16.5px;
  }
  nav#TOC {
    width: 320px;
    padding: 36px 18px 36px 32px;
  }
}

/* ========================================================================
   平板（641-1023px）
   ======================================================================== */
@media (min-width: 641px) and (max-width: 1023px) {
  body {
    max-width: 720px;
    padding: 48px 36px 96px;
  }
}

/* ========================================================================
   移动端 (<640px)
   ======================================================================== */
@media (max-width: 640px) {
  html { font-size: 15.5px; }
  body {
    padding: 24px 16px 64px;
    line-height: 1.7;
  }
  h1 { font-size: 1.65em; }
  h2 { font-size: 1.32em; margin-top: 1.7em; }
  h3 { font-size: 1.12em; }
  h4 { font-size: 1.02em; }
  pre {
    font-size: 0.78em;
    padding: 0.85em 1em;
    border-radius: 6px;
    margin-left: -16px;
    margin-right: -16px;
    border-radius: 0;
  }
  table { font-size: 0.86em; }
  th, td { padding: 0.45em 0.6em; }
  blockquote { padding: 0.6em 0.85em; }
  nav#TOC { padding: 0.85em 1em; }
}

/* ========================================================================
   打印样式
   ======================================================================== */
@media print {
  :root { --bg: #fff; --bg-elev: #fff; --bg-sidebar: #fff; }
  html, body { background: #fff; color: #000; font-size: 11pt; }
  body {
    max-width: none;
    margin: 0;
    padding: 0;
  }
  nav#TOC {
    position: static;
    width: auto;
    border: none;
    background: transparent;
    box-shadow: none;
    page-break-after: always;
    padding: 0;
  }
  nav#TOC::before { border-bottom-color: #000; }
  pre {
    background: #f6f6f6;
    color: #1a1a1a;
    border: 1px solid #ccc;
    box-shadow: none;
    page-break-inside: avoid;
  }
  pre code, code { color: #1a1a1a; }
  code { background: #f0f0f0; color: #b03040; }
  blockquote { background: transparent; border-left: 2px solid #888; }
  a { color: #000; border-bottom: none; }
  h1, h2, h3, h4 { page-break-after: avoid; }
  table, figure, pre { page-break-inside: avoid; }
}

/* ========================================================================
   Q&A 卡片样式（interview-questions.html 专属）
   每道题视觉上是一个独立卡片：标题 + 答案 + 子点 + 来源
   ======================================================================== */

/* h3 作为问题卡片标题 */
h3[id^="a"], h3[id^="b"], h3[id^="c"], h3[id^="d"],
h3[id^="e"], h3[id^="f"], h3[id^="g"], h3[id^="h"],
h3[id^="i"], h3[id^="j"] {
  margin-top: 2.2em;
  padding: 0.8em 1em 0.6em;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px 8px 0 0;
  border-bottom: none;
  font-size: 1.12em;
  line-height: 1.5;
}

/* 紧跟 h3 的段落组成"答案体"——加左侧描边、统一内边距 */
h3[id^="a"] + p, h3[id^="b"] + p, h3[id^="c"] + p, h3[id^="d"] + p,
h3[id^="e"] + p, h3[id^="f"] + p, h3[id^="g"] + p, h3[id^="h"] + p,
h3[id^="i"] + p, h3[id^="j"] + p {
  margin-top: 0;
}

/* 答案/来源标签 — 加底色 badge */
p > strong:first-child:where(
  :is(p:has(> strong:first-child:is([data-label])))
) { /* placeholder — JS 注入实际标签时用 */ }

/* "答案"、"答案要点"、"问题背景"、"核心机制"、"工程取舍"、"延伸"、"来源" 等小标题段
   惯例：以 <strong>xxx</strong>：开头的段落 */
p > strong:first-child {
  /* 默认 strong 在段首是子标题 */
}

/* 子标题段——p 的第一个子元素是 <strong>，让 strong 视觉更突出 */
.qa-section-label {
  display: inline-block;
  font-size: 0.82em;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent-deep);
  background: var(--accent-soft);
  padding: 0.15em 0.6em;
  border-radius: 4px;
  margin-right: 0.5em;
  text-transform: uppercase;
  vertical-align: 2px;
}

/* 子点有序列表 — 每项独立行、数字 badge */
ol.qa-points {
  counter-reset: qa-point;
  list-style: none;
  padding-left: 0;
  margin: 0.7em 0 1.1em;
}

ol.qa-points > li {
  counter-increment: qa-point;
  position: relative;
  padding: 0.55em 0.8em 0.55em 2.6em;
  margin: 0.4em 0;
  border-left: 2px solid var(--border);
  background: var(--bg-soft);
  border-radius: 0 6px 6px 0;
}

ol.qa-points > li::before {
  content: counter(qa-point);
  position: absolute;
  left: 0.65em;
  top: 0.55em;
  width: 1.5em;
  height: 1.5em;
  line-height: 1.5em;
  text-align: center;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.78em;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

ol.qa-points > li > p:first-child { margin-top: 0; }
ol.qa-points > li > p:last-child { margin-bottom: 0; }

ol.qa-points ul,
ol.qa-points ol:not(.qa-points) {
  margin: 0.4em 0;
}

/* 来源 footer 风格 */
p.qa-source,
p:where(:last-of-type):has(> strong:first-child) {
  /* 占位：JS 给 来源 段加 .qa-source class */
}

p.qa-source {
  font-size: 0.88em;
  color: var(--text-muted);
  background: var(--bg-soft);
  border: 1px dashed var(--border);
  border-radius: 0 0 8px 8px;
  border-top: none;
  padding: 0.55em 1em;
  margin-top: -0.3em;
  margin-bottom: 1.8em;
}

p.qa-source strong { color: var(--text-muted); font-weight: 600; }

/* 术语链接 — 答案内 [术语] 的视觉提示 */
a.term-ref {
  border-bottom: 1px dotted var(--accent);
  color: var(--inline-fg);
  background: var(--accent-soft);
  padding: 0.05em 0.32em 0.05em 0.32em;
  border-radius: 3px;
  font-size: 0.94em;
  white-space: nowrap;
  transition: background 0.12s ease;
}

a.term-ref::before {
  content: "📖";
  font-size: 0.72em;
  margin-right: 0.18em;
  opacity: 0.55;
  vertical-align: 1px;
}

a.term-ref:hover {
  background: var(--accent);
  color: #fff;
  border-bottom-color: var(--accent-deep);
}

a.term-ref:hover::before { opacity: 1; }

/* ========================================================================
   术语速查表（glossary）
   每条术语用 <details> 折叠，默认收起
   ======================================================================== */

.glossary {
  margin: 2em 0;
}

.glossary h3 {
  margin-top: 1.6em;
  font-size: 1.1em;
  color: var(--accent-deep);
  background: none;
  border: none;
  padding: 0 0 0.3em;
  border-bottom: 1px dashed var(--border);
}

.glossary details {
  margin: 0.45em 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border-strong);
  border-radius: 6px;
  padding: 0.55em 0.9em;
  transition: border-left-color 0.15s ease, box-shadow 0.15s ease;
}

.glossary details[open] {
  border-left-color: var(--accent);
  box-shadow: var(--shadow-md);
  padding-bottom: 0.9em;
}

.glossary details summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--text-strong);
  line-height: 1.55;
  outline: none;
  position: relative;
  padding-left: 1.3em;
  list-style: none;
}

.glossary details summary::-webkit-details-marker { display: none; }
.glossary details summary::marker { content: ""; }

.glossary details summary::before {
  content: "▶";
  position: absolute;
  left: 0;
  top: 0.05em;
  font-size: 0.7em;
  color: var(--accent);
  transition: transform 0.15s ease;
  display: inline-block;
}

.glossary details[open] > summary::before {
  transform: rotate(90deg);
}

.glossary details summary strong {
  color: var(--accent-deep);
  font-weight: 700;
  letter-spacing: 0.005em;
}

.glossary details summary .term-tag {
  display: inline-block;
  font-size: 0.72em;
  color: var(--text-subtle);
  background: var(--bg-soft);
  padding: 0.05em 0.45em;
  border-radius: 3px;
  margin-left: 0.5em;
  vertical-align: 2px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.glossary details > :not(summary) {
  margin-top: 0.6em;
  margin-bottom: 0.4em;
  font-size: 0.96em;
  color: var(--text);
  line-height: 1.72;
}

.glossary details > p:first-of-type:not(:has(> strong:first-child)) {
  margin-top: 0.7em;
}

.glossary details ul,
.glossary details ol {
  margin: 0.4em 0 0.5em;
  padding-left: 1.4em;
  font-size: 0.95em;
}

.glossary details li { margin: 0.18em 0; }

.glossary details code {
  font-size: 0.84em;
}

/* 通过 hash 跳转过来的术语，临时高亮 */
.glossary details:target {
  border-left-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
  animation: glossary-flash 1.6s ease;
}

/* ========================================================================
   术语弹窗（点 a.term-ref 触发，浮在原文旁边而不跳转）
   ======================================================================== */
.term-popover {
  position: absolute;
  width: min(420px, calc(100vw - 24px));
  max-height: min(60vh, 480px);
  overflow-y: auto;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(40, 30, 10, 0.18), 0 2px 6px rgba(40, 30, 10, 0.08);
  padding: 0.95em 1.1em 0.9em;
  z-index: 9999;
  font-size: 0.95em;
  line-height: 1.7;
  color: var(--text);
  animation: term-pop-in 0.14s ease;
}

@keyframes term-pop-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.term-popover-close {
  position: absolute;
  top: 4px;
  right: 6px;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 1.4em;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  border-radius: 4px;
  transition: background 0.1s ease, color 0.1s ease;
}
.term-popover-close:hover {
  background: var(--bg-soft);
  color: var(--accent-deep);
}

.term-popover-head {
  font-size: 1em;
  font-weight: 600;
  color: var(--accent-deep);
  padding-right: 1.8em;
  margin-bottom: 0.55em;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 0.55em;
}
.term-popover-head strong { color: var(--accent-deep); }
.term-popover-head .term-tag {
  display: inline-block;
  font-size: 0.7em;
  color: var(--text-subtle);
  background: var(--bg-soft);
  padding: 0.05em 0.45em;
  border-radius: 3px;
  margin-left: 0.5em;
  vertical-align: 2px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-weight: 600;
}

.term-popover-body {
  font-size: 0.95em;
}
.term-popover-body p:first-child { margin-top: 0; }
.term-popover-body p:last-child  { margin-bottom: 0; }
.term-popover-body ul,
.term-popover-body ol {
  margin: 0.35em 0;
  padding-left: 1.3em;
}
.term-popover-body li { margin: 0.18em 0; }
.term-popover-body code { font-size: 0.86em; }
.term-popover-body a.term-ref {
  /* 弹窗内的二级术语链接还能再点开下一层 */
}

.term-popover-footer {
  margin-top: 0.75em;
  padding-top: 0.5em;
  border-top: 1px dashed var(--border);
  font-size: 0.82em;
  text-align: right;
}
.term-popover-footer a {
  color: var(--text-muted);
  border-bottom: none;
}
.term-popover-footer a:hover {
  color: var(--accent);
}

/* 移动端：popover 居中固定 */
.term-popover.term-popover-mobile {
  position: fixed;
  width: calc(100vw - 32px);
  max-width: 420px;
  max-height: 70vh;
  top: 50% !important;
  left: 50% !important;
  transform: translate(-50%, -50%);
}
/* 移动端遮罩（通过 body 类切换，可选） */
@media (max-width: 720px) {
  .term-popover { font-size: 0.94em; }
}

@keyframes glossary-flash {
  0%   { background: var(--accent-soft); }
  100% { background: var(--bg-elev); }
}

/* "返回正文"链接 */
.glossary details .back-to-top {
  display: inline-block;
  font-size: 0.82em;
  color: var(--text-muted);
  border: none;
  margin-top: 0.5em;
}

.glossary details .back-to-top::before {
  content: "↑ ";
}

/* 移动端 Q&A 卡片紧凑化 */
@media (max-width: 640px) {
  h3[id^="a"], h3[id^="b"], h3[id^="c"], h3[id^="d"],
  h3[id^="e"], h3[id^="f"], h3[id^="g"], h3[id^="h"],
  h3[id^="i"], h3[id^="j"] {
    padding: 0.65em 0.8em 0.5em;
    font-size: 1.04em;
  }
  ol.qa-points > li {
    padding: 0.5em 0.6em 0.5em 2.3em;
  }
  ol.qa-points > li::before {
    left: 0.5em;
    width: 1.35em;
    height: 1.35em;
    line-height: 1.35em;
    font-size: 0.72em;
  }
  p.qa-source {
    padding: 0.5em 0.8em;
    font-size: 0.85em;
  }
  a.term-ref {
    white-space: normal;
  }
  .glossary details {
    padding: 0.5em 0.7em;
  }
}



@media print {
  .glossary details { border: 1px solid #ccc; box-shadow: none; page-break-inside: avoid; }
  .glossary details summary::before { content: ""; }
  .glossary details > :not(summary) { display: block !important; }
  ol.qa-points > li::before { background: #555; }
  a.term-ref { background: transparent; border-bottom: 1px solid #888; }
  a.term-ref::before { content: ""; }
}