
:root {
  --background-color: #ffffff;
  --text-color: #333333;
  --code-bg-color: #f5f5f5;
  --link-color: #0366d6;
  --highlight-color: #0366d6;
  --border-color: #eee;
  --table-border-color: #ddd;
  --table-header-bg: #f2f2f2;
  --blockquote-color: #666;
  --blockquote-border: #ddd;
  --part-header-bg: #f8f8f8;
  --footer-text-color: #666;
  --filename-bg: #f5f5f5;
  --nav-bg: #f5f5f5;
  --nav-hover-bg: #e6e6e6;
  --toc-bg: #f8f8f8;
  --highlight-section-bg: #f8f8f8;
  --highlight-section-border: #0366d6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #1a1a1a;
    --text-color: #e6e6e6;
    --code-bg-color: #2d2d2d;
    --link-color: #58a6ff;
    --highlight-color: #58a6ff;
    --border-color: #333;
    --table-border-color: #444;
    --table-header-bg: #2d2d2d;
    --blockquote-color: #aaa;
    --blockquote-border: #444;
    --part-header-bg: #222;
    --footer-text-color: #aaa;
    --filename-bg: #2d2d2d;
    --nav-bg: #2d2d2d;
    --nav-hover-bg: #444;
    --toc-bg: #222;
    --highlight-section-bg: #2d2d2d;
    --highlight-section-border: #58a6ff;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Serif CJK SC", "Source Han Serif SC", "Source Han Serif CN", serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.language-shell {
  background-color: #1e1e1e;
  color: #f8f8f8;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
}

th, td {
  border: 1px solid var(--table-border-color);
  padding: 8px;
  text-align: left;
}

th {
  background-color: var(--table-header-bg);
}

blockquote {
  border-left: 4px solid var(--blockquote-border);
  padding-left: 1em;
  margin-left: 0;
  color: var(--blockquote-color);
}

.part-header {
  background-color: var(--part-header-bg);
  padding-left: 15px;
  margin-left: 30px 0;
  border-left: 5px solid #673AB7;
}

.chapter-title {
  font-size: 1.8em;
  margin-top: 2em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5em;
}

.section-title {
  color: var(--highlight-color);
}

.toc {
  background-color: var(--toc-bg);
  padding: 15px;
  margin: 20px 0;
  border-radius: 5px;
}

.toc ul {
  list-style-type: none;
  padding-left: 20px;
}

.toc li {
  margin: 5px 0;
}

.toc a {
  text-decoration: none;
}

.book-cover {
  max-width: 300px;
  display: block;
  margin: 20px auto;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.subtitle {
  font-size: 1.2em;
  color: var(--footer-text-color);
  font-style: italic;
  text-align: center;
  margin: 10px 0;
}

.author-info {
  text-align: center;
  margin: 20px 0;
}

.author-info p {
  margin: 8px 0;
  font-size: 1.1em;
}

p.zh {
  text-indent: 2em;
}

.author-info a {
  color: var(--link-color);
  text-decoration: none;
}

.author-info a:hover {
  text-decoration: underline;
}

.tikz-figure {
  display: none;
}

.samllsection {
  font-weight: bold;
  margin: 15px 0 5px 0;
  background-color: var(--filename-bg);
  padding: 8px;
  border-left: 3px solid #CDDC39;
  font-family: "Hack", Consolas, Monaco, "Andale Mono", monospace;
}

.subsection {
  font-weight: bold;
  margin: 15px 0 5px 0;
  background-color: var(--filename-bg);
  padding: 8px;
  border-left: 3px solid #ff5722;
  font-family: "Hack", Consolas, Monaco, "Andale Mono", monospace;
}

.filename {
  font-weight: bold;
  margin: 15px 0 5px 0;
  background-color: var(--filename-bg);
  padding: 8px;
  border-left: 3px solid var(--highlight-color);
  font-family: "Hack", Consolas, Monaco, "Andale Mono", monospace;
}

.footnote-text {
  font-size: 0.85em;
  color: var(--footer-text-color);
  margin: 10px 0;
}

.list-item {
  margin: 5px 0;
  padding-left: 20px;
  position: relative;
}

code {
  font-family: "Hack", Consolas, Monaco, "Andale Mono", monospace;
  background-color: var(--code-bg-color);
  border-radius: 3px;
}

.code-marker {
  display: inline-block;
  background-color: #ffeb3b;
  color: #000;
  margin: 0 2px;
  border-radius: 3px;
  font-weight: bold;
  font-size: 0.9em;
}

.language-cpp {
  color: var(--text-color);
  font-family: "Hack", Consolas, Monaco, "Andale Mono", monospace;
}

.language-rust {
  color: var(--text-color);
  font-family: "Hack", Consolas, Monaco, "Andale Mono", monospace;
}

.footnote {
  font-size: 0.85em;
  vertical-align: super;
  color: var(--link-color);
}

.navigation {
  display: flex;
  justify-content: space-between;
  margin: 30px 0;
  padding: 15px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.navigation a {
  text-decoration: none;
  padding: 8px 15px;
  background-color: var(--nav-bg);
  border-radius: 4px;
  color: var(--link-color);
}

.navigation a:hover {
  background-color: var(--nav-hover-bg);
}

.back-to-toc {
  text-align: center;
  margin: 20px 0;
}

.highlight-section {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  font-size: 1.2em;
  font-weight: bold;
  color: var(--highlight-color);
  padding-left: 10px;
  border-left: 3px solid var(--highlight-section-border);
  background-color: var(--highlight-section-bg);
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background-color: var(--code-bg-color);
  color: var(--text-color);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
  z-index: 1000;
}

.theme-toggle:hover {
  background-color: var(--nav-hover-bg);
}

footer {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  color: var(--footer-text-color);
  text-align: center;
}

.tip-box.note {
  border-left: 4px solid #007acc; /* 蓝色左边框 */
  background-color: #e7f3ff;       /* 浅蓝背景 */
  color: #004080;
  padding: 12px 20px;
  margin: 15px 0;
  border-radius: 4px;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.5;
  position: relative;
}

.tip-box.tip {
  border-left: 4px solid #28a745; /* 绿色左边框 */
  background-color: #e6f4ea;      /* 淡绿色背景 */
  color: #215c2a;                 /* 深绿色文本 */
  padding: 12px 20px;
  margin: 15px 0;
  border-radius: 4px;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.5;
  position: relative;
}

.tip-box.note strong {
  display: block;
  font-size: 1.1em;
  margin-bottom: 10px;
}

.image-block {
  text-align: center;
  margin: 1em 0;
}

.image-block img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.image-block .caption {
  display: block;
  margin-top: 8px;
  font-size: 0.95em;
  color: #555;
}

/* 始终显示 Prism 的复制按钮 */
div.code-toolbar > .toolbar {
  opacity: 1 !important;
  transition: none !important;
}

/* 避免按钮遮挡代码 */
div.code-toolbar > .toolbar .toolbar-item {
  pointer-events: auto;
}

div.code-toolbar > .toolbar {
  position: absolute;
  top: 0;
  right: 0;
}
pre.code-toolbar {
  position: relative;
}
