/* ============================================================
   精通以太坊 — 自訂樣式表
   針對 Asciidoctor HTML5 輸出 (body.book.toc2.toc-left)
   ============================================================ */

/* ===== CSS 變數 ===== */
:root {
  --text-color: #2c3e50;
  --text-secondary: #555;
  --bg-color: #ffffff;
  --bg-secondary: #f8f9fa;
  --code-bg: #f6f8fa;
  --border-color: #e1e4e8;
  --link-color: #2980b9;
  --link-hover: #1a5276;
  --heading-color: #1a252f;
  --toc-width: 300px;
  --max-content-width: 880px;
  --font-size-base: 17px;
  --line-height: 1.85;
  --mono-font: "JetBrains Mono", "Fira Code", "Source Code Pro", "SF Mono", Menlo, Consolas, monospace;
  --body-font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", -apple-system, "Segoe UI", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

::selection {
  background: #b3d9ff;
  color: #1a252f;
}

/* ===== 基礎排版 ===== */
body {
  font-family: var(--body-font);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--text-color);
  background: var(--bg-color);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ===== 桌面版：左側固定 TOC 佈局 ===== */
body.toc2.toc-left {
  padding-left: var(--toc-width);
}

/* ===== 頁首 ===== */
#header {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 2.5rem 2rem 1rem;
}

#header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--heading-color);
  margin: 0 0 0.5rem;
  line-height: 1.2;
  border-bottom: 3px solid var(--heading-color);
  padding-bottom: 0.6rem;
}

/* ===== 左側 TOC 側邊欄 ===== */
body.toc2.toc-left #toc {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--toc-width);
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 1.5rem 1rem 2rem;
  z-index: 100;
  font-size: 0.88rem;
  -webkit-overflow-scrolling: touch;
}

body.toc2.toc-left #toc::-webkit-scrollbar {
  width: 4px;
}

body.toc2.toc-left #toc::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 2px;
}

#toctitle {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--heading-color);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
}

#toc ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

#toc ul ul {
  padding-left: 0.9rem;
}

#toc ul ul ul {
  padding-left: 0.8rem;
}

#toc li {
  margin: 0;
  line-height: 1.4;
}

#toc a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
  word-break: break-word;
}

#toc a:hover {
  background: #e8ecf0;
  color: var(--link-color);
  text-decoration: none;
}

/* TOC 層級區分 */
#toc .sectlevel1 > li > a {
  font-weight: 600;
  color: var(--heading-color);
  padding: 0.35rem 0.5rem;
  margin-top: 0.3rem;
}

#toc .sectlevel2 > li > a {
  font-size: 0.85rem;
}

#toc .sectlevel3 > li > a,
#toc .sectlevel4 > li > a {
  font-size: 0.8rem;
  color: #888;
}

/* ===== 主要內容區 ===== */
#content {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 1.5rem 2rem 5rem;
}

/* ===== 前言區 ===== */
#preamble .sectionbody {
  font-size: 1.05em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

/* ===== 章節結構 ===== */
.sect1 {
  padding-top: 1rem;
  scroll-margin-top: 1rem;
}

.sect1 + .sect1 {
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}

.sect2 {
  scroll-margin-top: 1rem;
}

/* ===== 標題 ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--body-font);
  color: var(--heading-color);
  font-weight: 700;
  line-height: 1.3;
  margin-top: 2.2rem;
  margin-bottom: 0.8rem;
}

h2 {
  font-size: 1.7rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--border-color);
}

h3 {
  font-size: 1.35rem;
  padding-bottom: 0.2rem;
  border-bottom: 1px solid #eee;
}

h4 {
  font-size: 1.15rem;
}

h5, h6 {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* ===== 段落 ===== */
.paragraph p,
p {
  margin: 0.75rem 0;
  word-break: break-word;
  overflow-wrap: break-word;
}

/* ===== 連結 ===== */
a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.15s;
  word-break: break-all;
  overflow-wrap: break-word;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

/* ===== 行內程式碼 ===== */
code {
  font-family: var(--mono-font);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  border: 1px solid #eaeef2;
  word-break: break-word;
}

/* ===== 程式碼區塊 (Listing Blocks) ===== */
.listingblock,
.literalblock {
  margin: 1.5rem 0;
}

.listingblock > .title {
  font-size: 0.85em;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  font-style: italic;
}

.listingblock .content pre,
.literalblock .content pre,
pre {
  font-family: var(--mono-font);
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  line-height: 1.55;
  margin: 0;
  font-size: 0.85em;
  tab-size: 4;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  white-space: pre;
  word-break: normal;
  overflow-wrap: normal;
}

/* Rouge 行號表格 */
.listingblock pre.rouge.highlight table.linenotable {
  display: table;
  width: 100%;
  border: none;
  margin: 0;
  padding: 0;
  background: transparent;
  overflow: visible;
}

.listingblock pre.rouge.highlight table.linenotable td {
  border: none;
  padding: 0;
  vertical-align: top;
}

.listingblock pre.rouge.highlight .linenos.gl {
  width: 1%;
  white-space: nowrap;
  padding-right: 1rem;
  user-select: none;
}

.listingblock pre.rouge.highlight .linenos.gl pre.lineno {
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  color: #aaa;
  text-align: right;
  font-size: inherit;
}

.listingblock pre.rouge.highlight td.code pre {
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  font-size: inherit;
}

/* Rouge 語法高亮由 rouge-github.css 提供 */

/* ===== 表格 ===== */
table.tableblock,
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95em;
}

/* 不要把表格設為 display:block，否則會破壞佈局 */
table.tableblock {
  display: table;
}

table.tableblock thead th,
table thead th {
  background: #f0f3f6;
  font-weight: 700;
  text-align: left;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border-color);
}

table.tableblock td,
table td {
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border-color);
  vertical-align: top;
}

table.tableblock tbody tr:nth-child(even),
table tbody tr:nth-child(even) {
  background: #fafbfc;
}

/* 表格響應式容器 */
.tableblock-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.5rem 0;
}

/* ===== 圖片 ===== */
img {
  max-width: 100%;
  height: auto;
}

.imageblock {
  margin: 1.8rem 0;
  text-align: center;
}

.imageblock .content {
  display: inline-block;
  max-width: 100%;
}

.imageblock .content img {
  display: block;
  margin: 0 auto;
  border-radius: 4px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.imageblock > .title {
  font-size: 0.88em;
  color: #888;
  margin-top: 0.6rem;
  font-style: italic;
  text-align: center;
}

/* 圖片尺寸變體 */
.imageblock.smallerthirty .content img { max-width: 30%; }
.imageblock.smallersixty .content img { max-width: 60%; }
.imageblock.smallerseventy .content img { max-width: 70%; }

/* ===== 提示/警告區塊 (Admonitions) ===== */
.admonitionblock {
  margin: 1.5rem 0;
  border-radius: 8px;
  overflow: hidden;
}

.admonitionblock > table {
  display: table;
  width: 100%;
  margin: 0;
  border: none;
  border-radius: 8px;
}

.admonitionblock > table td {
  border: none;
  padding: 1rem 1.2rem;
}

.admonitionblock td.icon {
  width: 52px;
  text-align: center;
  vertical-align: top;
  padding-top: 1.1rem;
}

/* 隱藏 FA 原始空圖標文字，用 ::before 顯示實際圖標 */
.admonitionblock td.icon i {
  display: block;
  text-align: center;
  width: 100%;
  height: 0;
  overflow: visible;
  font-size: 1px;
  color: transparent;
}

.admonitionblock td.icon i::before {
  display: block;
  font-size: 1.5rem;
  height: auto;
  color: inherit;
}

.admonitionblock td.icon i::after {
  display: block;
  font-family: var(--body-font);
  font-style: normal;
  font-size: 0.72rem;
  margin-top: 0.35rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  height: auto;
}

/* TIP */
.admonitionblock.tip > table {
  background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 100%);
  border-left: 4px solid #4caf50;
}
.admonitionblock.tip td.icon i { color: #2e7d32; }
.admonitionblock.tip td.icon i::before { content: "\f0eb"; font-family: FontAwesome; }
.admonitionblock.tip td.icon i::after { content: "提示"; color: #2e7d32; }

/* NOTE */
.admonitionblock.note > table {
  background: linear-gradient(135deg, #e3f2fd 0%, #e8eaf6 100%);
  border-left: 4px solid #2196f3;
}
.admonitionblock.note td.icon i { color: #1565c0; }
.admonitionblock.note td.icon i::before { content: "\f05a"; font-family: FontAwesome; }
.admonitionblock.note td.icon i::after { content: "備註"; color: #1565c0; }

/* WARNING */
.admonitionblock.warning > table {
  background: linear-gradient(135deg, #fff3e0 0%, #fff8e1 100%);
  border-left: 4px solid #ff9800;
}
.admonitionblock.warning td.icon i { color: #e65100; }
.admonitionblock.warning td.icon i::before { content: "\f071"; font-family: FontAwesome; }
.admonitionblock.warning td.icon i::after { content: "警告"; color: #e65100; }

/* IMPORTANT */
.admonitionblock.important > table {
  background: linear-gradient(135deg, #fce4ec 0%, #f8bbd0 100%);
  border-left: 4px solid #e91e63;
}
.admonitionblock.important td.icon i { color: #c62828; }
.admonitionblock.important td.icon i::before { content: "\f06a"; font-family: FontAwesome; }
.admonitionblock.important td.icon i::after { content: "重要"; color: #c62828; }

/* CAUTION */
.admonitionblock.caution > table {
  background: linear-gradient(135deg, #fff8e1 0%, #ffecb3 100%);
  border-left: 4px solid #ffc107;
}
.admonitionblock.caution td.icon i { color: #f57f17; }
.admonitionblock.caution td.icon i::before { content: "\f06d"; font-family: FontAwesome; }
.admonitionblock.caution td.icon i::after { content: "小心"; color: #f57f17; }

/* ===== 列表 ===== */
.ulist ul,
.olist ol {
  padding-left: 1.6rem;
  margin: 0.6rem 0;
}

.ulist li,
.olist li {
  margin: 0.3rem 0;
}

.ulist li > p,
.olist li > p {
  margin: 0.2rem 0;
}

/* 定義列表 */
.dlist dt,
.hdlist1 {
  font-weight: 700;
  margin-top: 0.8rem;
  color: var(--heading-color);
}

.dlist dd {
  margin-left: 1.5rem;
  margin-bottom: 0.5rem;
}

/* ===== 引用區塊 ===== */
.quoteblock {
  border-left: 4px solid #ddd;
  margin: 1.2rem 0;
  padding: 0.8rem 1.2rem;
  background: var(--bg-secondary);
  border-radius: 0 6px 6px 0;
}

.quoteblock blockquote {
  margin: 0;
  padding: 0;
  border: none;
  background: none;
}

.quoteblock .attribution {
  font-size: 0.85em;
  color: #888;
  margin-top: 0.5rem;
}

/* ===== 側邊欄區塊 ===== */
.sidebarblock {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.2rem 1.5rem;
  margin: 1.8rem 0;
}

.sidebarblock > .content > .title {
  font-weight: 700;
  font-size: 1.08em;
  color: var(--heading-color);
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}

/* ===== 範例區塊 ===== */
.exampleblock {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
  background: #fdfdfe;
}

.exampleblock > .title {
  font-weight: 600;
  font-size: 0.9em;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

/* ===== 數學公式 ===== */
.stemblock {
  margin: 1.5rem 0;
  overflow-x: auto;
}

/* ===== 頁尾 ===== */
#footer {
  max-width: var(--max-content-width);
  margin: 3rem auto 0;
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

#footer-text {
  font-size: 0.85em;
  color: #999;
}

/* ===== 腳註 ===== */
.footnote {
  font-size: 0.85em;
  color: #888;
}

/* ===== 水平線 ===== */
hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2rem 0;
}

/* ================================================================
   響應式設計
   ================================================================ */

/* ===== 平板 (769px ~ 1100px)：TOC 收窄 ===== */
@media screen and (max-width: 1100px) {
  :root {
    --toc-width: 250px;
  }
}

/* ===== 手機版 (< 769px)：TOC 隱藏，全寬內容 ===== */
@media screen and (max-width: 768px) {
  :root {
    --font-size-base: 16px;
    --line-height: 1.75;
  }

  /* 取消 TOC 側邊欄佈局 */
  body.toc2.toc-left {
    padding-left: 0;
  }

  /* 隱藏原生 TOC（用浮動面板替代）*/
  body.toc2.toc-left #toc {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    max-height: none;
    display: none;
  }

  #header {
    padding: 1.5rem 1rem 0.8rem;
  }

  #header h1 {
    font-size: 1.6rem;
  }

  #content {
    padding: 1rem 1rem 3rem;
  }

  h2 { font-size: 1.4rem; }
  h3 { font-size: 1.2rem; }
  h4 { font-size: 1.08rem; }

  /* 程式碼區塊 */
  .listingblock .content pre,
  .literalblock .content pre,
  pre {
    padding: 0.8rem;
    font-size: 0.8em;
    border-radius: 6px;
  }

  /* 表格水平捲動 */
  table.tableblock {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table.tableblock thead th {
    padding: 0.5rem;
    white-space: nowrap;
  }

  table.tableblock td {
    padding: 0.4rem 0.5rem;
  }

  /* Admonition 更緊湊 */
  .admonitionblock td.icon {
    width: 40px;
    padding: 0.7rem 0.5rem;
  }

  .admonitionblock td.content {
    padding: 0.7rem;
  }

  /* 圖片尺寸變體在手機上全寬 */
  .imageblock.smallerthirty .content img,
  .imageblock.smallersixty .content img,
  .imageblock.smallerseventy .content img {
    max-width: 100%;
  }

  /* 列表 */
  .ulist ul,
  .olist ol {
    padding-left: 1.3rem;
  }

  /* 章節間距 */
  .sect1 + .sect1 {
    margin-top: 1.5rem;
  }
}

/* ===== 小手機 (< 480px) ===== */
@media screen and (max-width: 480px) {
  :root {
    --font-size-base: 15px;
  }

  #content {
    padding: 0.8rem 0.8rem 2rem;
  }

  #header {
    padding: 1rem 0.8rem 0.5rem;
  }

  #header h1 {
    font-size: 1.35rem;
  }

  h2 { font-size: 1.25rem; }
  h3 { font-size: 1.1rem; }

  .listingblock .content pre,
  pre {
    font-size: 0.75em;
    padding: 0.6rem;
    border-radius: 4px;
  }

  .admonitionblock td.icon i::after {
    display: none;
  }
}

/* ===== 寬螢幕 (> 1400px) ===== */
@media screen and (min-width: 1400px) {
  :root {
    --font-size-base: 18px;
    --toc-width: 320px;
    --max-content-width: 920px;
  }
}

/* ===== 列印樣式 ===== */
@media print {
  body.toc2.toc-left {
    padding-left: 0;
  }

  body.toc2.toc-left #toc {
    position: static;
    width: 100%;
    height: auto;
    border: 1px solid #ddd;
    page-break-after: always;
  }

  body {
    font-size: 11pt;
    line-height: 1.5;
    color: #000;
  }

  #content {
    max-width: 100%;
  }

  pre {
    border: 1px solid #ccc;
    page-break-inside: avoid;
    font-size: 9pt;
  }

  img {
    max-width: 100%;
    page-break-inside: avoid;
  }

  h1, h2, h3, h4 {
    page-break-after: avoid;
  }

  .admonitionblock, .sidebarblock {
    page-break-inside: avoid;
  }
}