/*! modern-normalize v3.0.1 | MIT License | https://github.com/sindresorhus/modern-normalize */
*,::before,::after{box-sizing:border-box}
html{font-family:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif,'Apple Color Emoji','Segoe UI Emoji';line-height:1.15;-webkit-text-size-adjust:100%;tab-size:4}
body{margin:0}
b,strong{font-weight:bolder}
code,kbd,samp,pre{font-family:ui-monospace,SFMono-Regular,Consolas,'Liberation Mono',Menlo,monospace;font-size:1em}
small{font-size:80%}
sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}
sub{bottom:-0.25em}
sup{top:-0.5em}
table{border-color:currentcolor}
button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}
button,[type='button'],[type='reset'],[type='submit']{-webkit-appearance:button}
legend{padding:0}
progress{vertical-align:baseline}
::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}
[type='search']{-webkit-appearance:textfield;outline-offset:-2px}
::-webkit-search-decoration{-webkit-appearance:none}
::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}
summary{display:list-item}

/* ═══════════════════════════════════════════
   CSS Custom Properties (light theme default)
   ═══════════════════════════════════════════ */
:root {
  --font-size: 16px;
  --font-size-smaller: 0.875rem;
  --font-size-smallest: 0.75rem;

  --body-font-weight: 400;
  --body-background: #ffffff;
  --body-background-tint: transparent;
  --body-font-color: #000000;

  --border-radius: 0.25rem;

  --color-link: #0055bb;
  --color-visited-link: #5500bb;

  --icon-filter: none;

  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-500: #adb5bd;

  --color-accent-default:        #64748b;
  --color-accent-default-tint:   rgba(100,116,139,.1);
  --color-accent-note:           #4486dd;
  --color-accent-note-tint:      rgba(68,134,221,.1);
  --color-accent-tip:            #3bad3b;
  --color-accent-tip-tint:       rgba(59,173,59,.1);
  --color-accent-important:      #8144dd;
  --color-accent-important-tint: rgba(129,68,221,.1);
  --color-accent-warning:        #f59e42;
  --color-accent-warning-tint:   rgba(245,158,66,.1);
  --color-accent-caution:        #d84747;
  --color-accent-caution-tint:   rgba(216,71,71,.1);
  /* legacy hint shortcode aliases */
  --color-accent-info:           #4486dd;
  --color-accent-info-tint:      rgba(68,134,221,.1);
  --color-accent-success:        #3bad3b;
  --color-accent-success-tint:   rgba(59,173,59,.1);
  --color-accent-danger:         #d84747;
  --color-accent-danger-tint:    rgba(216,71,71,.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --body-background: #2e3440;
    --body-font-color: #eceff4;
    --color-link: #81a1c1;
    --color-visited-link: #81a1c1;
    --icon-filter: brightness(0) invert(1);
    --gray-100: #3b4252;
    --gray-200: #434c5e;
    --gray-500: #d8dee9;
    --color-accent-default:        #81a1c1;
    --color-accent-default-tint:   rgba(129,161,193,.1);
    --color-accent-note:           #5e81ac;
    --color-accent-note-tint:      rgba(94,129,172,.1);
    --color-accent-tip:            #a3be8c;
    --color-accent-tip-tint:       rgba(163,190,140,.1);
    --color-accent-important:      #b48ead;
    --color-accent-important-tint: rgba(180,142,173,.1);
    --color-accent-warning:        #d08770;
    --color-accent-warning-tint:   rgba(208,135,112,.1);
    --color-accent-caution:        #bf616a;
    --color-accent-caution-tint:   rgba(191,97,106,.1);
    --color-accent-info:           #5e81ac;
    --color-accent-info-tint:      rgba(94,129,172,.1);
    --color-accent-success:        #a3be8c;
    --color-accent-success-tint:   rgba(163,190,140,.1);
    --color-accent-danger:         #bf616a;
    --color-accent-danger-tint:    rgba(191,97,106,.1);
  }
}

/* ═══════════════════════════════════════════
   Utility classes
   ═══════════════════════════════════════════ */
.flex           { display: flex; }
.flex.gap       { gap: 1rem; }
.flex-auto      { flex: 1 1 auto; }
.flex-even      { flex: 1 1; }
.flex-wrap      { flex-wrap: wrap; }
.justify-start  { justify-content: flex-start; }
.justify-end    { justify-content: flex-end; }
.justify-center { justify-content: center; }
.justify-between{ justify-content: space-between; }
.align-center   { align-items: center; }
.mx-auto        { margin: 0 auto; }
.text-center    { text-align: center; }
.text-left      { text-align: left; }
.text-right     { text-align: right; }
.text-small     { font-size: .875em; }
.hidden         { display: none; }

input.toggle {
  height: 0; width: 0;
  overflow: hidden; opacity: 0;
  position: absolute;
}

@keyframes spin { 100% { transform: rotate(360deg); } }

/* ═══════════════════════════════════════════
   Base HTML
   ═══════════════════════════════════════════ */
html {
  font-size: var(--font-size);
  scroll-behavior: smooth;
  touch-action: manipulation;
  scrollbar-gutter: stable;
}

body {
  min-width: 20rem;
  color: var(--body-font-color);
  background: var(--body-background);
  font-weight: var(--body-font-weight);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,h2,h3,h4,h5,h6 { font-weight: inherit; }

a {
  flex: auto;
  align-items: center;
  gap: .5em;
  text-decoration: none;
  cursor: default;
}
a[href], a[role=button] {
  color: var(--color-link);
  cursor: pointer;
}

small { font-size: .875em; }

:focus-visible, input.toggle:focus-visible + label {
  outline-style: auto;
  outline-color: var(--color-link);
}

nav ul {
  padding: 0; margin: 0; list-style: none;
}
nav ul li { position: relative; }
nav ul a {
  padding: 0.5em 0;
  display: flex;
  transition: opacity 0.1s ease-in-out;
}
nav ul a[href]:hover, nav ul a[role=button]:hover { opacity: 0.5; }
nav ul ul { padding-inline-start: 1.5em; }

ul.pagination {
  display: flex;
  justify-content: center;
  list-style-type: none;
  padding-inline-start: 0;
}
ul.pagination .page-item a { padding: 1rem; }

/* ═══════════════════════════════════════════
   Layout
   ═══════════════════════════════════════════ */
.container {
  max-width: 90rem;
  margin: 0 auto;
}

/* SVG icons used inline */
.book-icon {
  filter: var(--icon-filter);
  height: 1em;
  width: 1em;
}
a .book-icon { height: 1em; width: 1em; }

/* ── Brand ── */
.book-brand {
  margin-top: 0;
  margin-bottom: 1rem;
}
.book-brand img { height: 1.5em; width: 1.5em; }

/* ── Left menu ── */
.book-menu {
  flex: 0 0 16rem;
  font-size: var(--font-size-smaller);
}
.book-menu .book-menu-content {
  width: 16rem;
  padding: 1rem;
  position: fixed;
  top: 0; bottom: 0;
  overflow-x: hidden; overflow-y: auto;
}
.book-menu a,
.book-menu label {
  color: inherit;
  word-wrap: break-word;
  display: flex;
}
.book-menu a.active { color: var(--color-link); }
.book-menu label > img:last-child,
.book-menu label > svg:last-child {
  height: 1em; width: 1em;
  cursor: pointer;
  align-self: center;
  transition: transform 0.1s ease-in-out;
}
.book-menu input.toggle + label + ul { display: none; }
.book-menu input.toggle:checked + label > img:last-child,
.book-menu input.toggle:checked + label > svg:last-child {
  transform: rotate(90deg);
}
.book-menu input.toggle:checked + label + ul { display: block; }

.book-section-flat { margin: 1rem 0; }
.book-section-flat > a,
.book-section-flat > span,
.book-section-flat > label { font-weight: bolder; }
.book-section-flat > ul { padding-inline-start: 0; }

/* ── Middle content ── */
.book-page {
  min-width: 20rem;
  flex-grow: 1;
  padding: 1rem;
}

/* ── Post card in list ── */
.book-post {
  margin-bottom: 4rem;
}
.book-post .book-post-date img,
.book-post .book-post-date svg {
  height: 1em; width: 1em;
  margin-inline-end: .5em;
}
.book-post .book-post-content { margin-top: 1rem; }
.book-post .book-post-thumbnail {
  flex: 0 0 34%;
}
.book-post .book-post-thumbnail img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ── Mobile header ── */
.book-header { margin-bottom: 1rem; }
.book-header label { line-height: 0; }
.book-header h3 {
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0 1rem;
}

/* ── Search ── */
.book-search {
  position: relative;
  margin: 0.5rem 0;
}
.book-search input {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  background: var(--gray-100);
  color: var(--body-font-color);
}
.book-search input:required + .book-search-spinner { display: block; }
.book-search .book-search-spinner {
  position: absolute;
  top: 0;
  margin: 0.5rem;
  margin-inline-start: calc(100% - 1.5rem);
  width: 1rem; height: 1rem;
  border: 1px solid transparent;
  border-top-color: var(--body-font-color);
  border-radius: 50%;
  animation: spin 1s ease infinite;
}
.book-search ul a { padding-bottom: 0; }
.book-search small { opacity: 0.5; }

/* ── Right TOC ── */
.book-toc {
  flex: 0 0 18rem;
  font-size: var(--font-size-smallest);
}
.book-toc .book-toc-content {
  width: 18rem;
  padding: 1rem;
  position: fixed;
  top: 0; bottom: 0;
  overflow-x: hidden; overflow-y: auto;
}
.book-toc a { display: block; }
.book-toc img,
.book-toc svg { height: 1em; width: 1em; }
.book-toc nav > ul > li:first-child { margin-top: 0; }

/* ── Footer ── */
.book-footer {
  padding-top: 1rem;
  font-size: var(--font-size-smaller);
}
.book-footer a { margin: 0.25rem 0; padding: 0.25rem 0; }
.book-comments { margin-top: 1rem; }
.book-copyright { margin-top: 1rem; }

/* ── Menu transition ── */
.book-menu-content,
.book-toc-content {
  transition: 0.2s ease-in-out;
  transition-property: transform, margin, opacity, visibility;
  will-change: transform, margin, opacity;
}

/* ═══════════════════════════════════════════
   Markdown content
   ═══════════════════════════════════════════ */
.markdown { line-height: 1.6; }
.markdown > :first-child { margin-top: 0; }

.markdown h1,.markdown h2,.markdown h3,
.markdown h4,.markdown h5,.markdown h6 {
  font-weight: inherit;
  line-height: 1;
  margin-top: 1.5em;
  margin-bottom: 1rem;
}
.markdown h1 a.anchor,
.markdown h2 a.anchor,
.markdown h3 a.anchor,
.markdown h4 a.anchor,
.markdown h5 a.anchor,
.markdown h6 a.anchor {
  opacity: 0;
  font-size: 0.75em;
  margin-inline-start: .25em;
}
.markdown h1:hover a.anchor,
.markdown h2:hover a.anchor,
.markdown h3:hover a.anchor,
.markdown h4:hover a.anchor,
.markdown h5:hover a.anchor,
.markdown h6:hover a.anchor,
.markdown a.anchor:focus-visible {
  opacity: initial;
  text-decoration: none;
}
.markdown h1 { font-size: 2rem; }
.markdown h2 { font-size: 1.5rem; }
.markdown h3 { font-size: 1.25rem; }
.markdown h4 { font-size: 1.125rem; }
.markdown h5 { font-size: 1rem; }
.markdown h6 { font-size: 0.875rem; }

.markdown b,.markdown optgroup,.markdown strong { font-weight: bolder; }

.markdown a { text-decoration: none; }
.markdown a[href]:hover { text-decoration: underline; }
.markdown a[href]:visited { color: var(--color-visited-link); }

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

.markdown code {
  direction: ltr;
  unicode-bidi: embed;
  padding: .125em .25em;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  font-size: 0.875em;
}

.markdown pre {
  padding: 1rem;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  overflow-x: auto;
}
.markdown pre:focus { outline-style: auto; outline-color: var(--color-link); }
.markdown pre code { padding: 0; border: 0; background: none; }

.markdown p { word-wrap: break-word; }

.markdown blockquote {
  margin: 1rem 0;
  padding: 0.5rem 1rem 0.5rem 0.75rem;
  border-inline-start: 0.25rem solid var(--gray-200);
  border-radius: var(--border-radius);
}
.markdown blockquote :first-child { margin-top: 0; }
.markdown blockquote :last-child  { margin-bottom: 0; }

.markdown table {
  overflow: auto;
  display: block;
  border-spacing: 0;
  border-collapse: collapse;
  margin-top: 1rem;
  margin-bottom: 1rem;
}
.markdown table tr th,
.markdown table tr td {
  padding: 0.5rem 1rem;
  border: 1px solid var(--gray-200);
  text-align: start;
}
.markdown table tr:nth-child(2n) { background: var(--gray-100); }

.markdown hr {
  height: 1px;
  border: none;
  background: var(--gray-200);
}

.markdown ul,.markdown ol {
  padding-inline-start: 2rem;
  word-wrap: break-word;
}

.markdown dl dt { font-weight: bolder; margin-top: 1rem; }
.markdown dl dd { margin-inline-start: 0; margin-bottom: 1rem; }

/* Code with line numbers */
.markdown .highlight {
  direction: ltr;
  unicode-bidi: embed;
  border-radius: var(--border-radius);
}
.markdown .highlight table tbody { border: 1px solid var(--gray-200); }
.markdown .highlight table tr pre { border: 0; }
.markdown .highlight table tr td pre code > span { display: flex; }
.markdown .highlight table tr td:nth-child(1) pre { margin: 0; padding-inline-end: 0; }
.markdown .highlight table tr td:nth-child(2) pre { margin: 0; padding-inline-start: 0; }

/* Details/summary */
.markdown details {
  padding: 1rem;
  margin: 1rem 0;
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
}
.markdown details summary {
  line-height: 1;
  padding: 1rem;
  margin: -1rem;
  cursor: pointer;
  list-style: none;
}
.markdown details summary::before {
  content: "›";
  display: inline-block;
  margin-inline-end: 0.5rem;
  transition: transform 0.1s ease-in-out;
}
.markdown details[open] summary { margin-bottom: 0; }
.markdown details[open] summary::before { transform: rotate(90deg); }

.markdown figure { margin: 1rem 0; }
.markdown figure figcaption { margin-top: 1rem; }
.markdown figure figcaption > :first-child { margin-top: 0; }
.markdown figure figcaption > :last-child  { margin-bottom: 0; }

.markdown-inner > :first-child { margin-top: 0; }
.markdown-inner > :last-child  { margin-bottom: 0; }

/* ═══════════════════════════════════════════
   Shortcode-style components
   (keep for compatibility if content uses them)
   ═══════════════════════════════════════════ */
.markdown .book-tabs {
  margin-top: 1rem; margin-bottom: 1rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  display: flex; flex-wrap: wrap;
}
.markdown .book-tabs label {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-bottom: 1px transparent;
  cursor: pointer;
}
.markdown .book-tabs .book-tabs-content {
  order: 999; width: 100%;
  border-top: 1px solid var(--gray-100);
  padding: 1rem; display: none;
}
.markdown .book-tabs input[type="radio"]:checked + label {
  border-bottom: 1px solid var(--color-link);
}
.markdown .book-tabs input[type="radio"]:checked + label + .book-tabs-content {
  display: block;
}

.markdown .book-columns { gap: 1rem; }
.markdown .book-columns > div { margin: 1rem 0; min-width: 13.2rem; }
.markdown .book-columns > ul {
  list-style: none; display: flex;
  padding: 0; flex-wrap: wrap; gap: 1rem;
}
.markdown .book-columns > ul > li { flex: 1 1; min-width: 13.2rem; }

.markdown a.book-btn[href] {
  display: inline-block;
  font-size: var(--font-size-smaller);
  color: var(--color-link);
  line-height: 2rem;
  padding: 0 1rem;
  border: 1px solid var(--color-link);
  border-radius: var(--border-radius);
  cursor: pointer;
}
.markdown a.book-btn[href]:hover { text-decoration: none; }

.markdown .book-hint {
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  border-radius: var(--border-radius);
  border-inline-start: 0.25rem solid;
}
.markdown .book-hint.note      { border-color: var(--color-accent-note);      background-color: var(--color-accent-note-tint); }
.markdown .book-hint.tip       { border-color: var(--color-accent-tip);       background-color: var(--color-accent-tip-tint); }
.markdown .book-hint.important { border-color: var(--color-accent-important); background-color: var(--color-accent-important-tint); }
.markdown .book-hint.warning   { border-color: var(--color-accent-warning);   background-color: var(--color-accent-warning-tint); }
.markdown .book-hint.caution   { border-color: var(--color-accent-caution);   background-color: var(--color-accent-caution-tint); }
.markdown .book-hint.default   { border-color: var(--color-accent-default);   background-color: var(--color-accent-default-tint); }
.markdown .book-hint.info      { border-color: var(--color-accent-info);      background-color: var(--color-accent-info-tint); }
.markdown .book-hint.success   { border-color: var(--color-accent-success);   background-color: var(--color-accent-success-tint); }
.markdown .book-hint.danger    { border-color: var(--color-accent-danger);    background-color: var(--color-accent-danger-tint); }

/* GitHub-style markdown alerts (Hugo 0.158+) */
.markdown blockquote.alert-note      { border-color: var(--color-accent-note);      background-color: var(--color-accent-note-tint); }
.markdown blockquote.alert-tip       { border-color: var(--color-accent-tip);       background-color: var(--color-accent-tip-tint); }
.markdown blockquote.alert-important { border-color: var(--color-accent-important); background-color: var(--color-accent-important-tint); }
.markdown blockquote.alert-warning   { border-color: var(--color-accent-warning);   background-color: var(--color-accent-warning-tint); }
.markdown blockquote.alert-caution   { border-color: var(--color-accent-caution);   background-color: var(--color-accent-caution-tint); }

.markdown .book-badge {
  display: inline-block;
  font-size: var(--font-size-smaller);
  font-weight: var(--body-font-weight);
  vertical-align: middle;
  border-radius: var(--border-radius);
  border: 1px solid var(--accent-color, var(--color-accent-default));
  overflow: hidden;
  text-wrap: nowrap;
  color: var(--body-font-color);
}
.markdown .book-badge span { display: inline-block; padding: 0 0.5rem; }
.markdown .book-badge span.book-badge-value {
  color: var(--body-background);
  background-color: var(--accent-color, var(--color-accent-default));
}

.markdown .book-codeblock-filename {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-bottom: 0;
  font-size: var(--font-size-smaller);
  margin-top: 1rem;
  padding: 0.25rem 0.5rem;
  border-start-start-radius: var(--border-radius);
  border-start-end-radius: var(--border-radius);
}
.markdown .book-codeblock-filename a { color: var(--body-font-color); }
.markdown .book-codeblock-filename + .highlight pre {
  margin-top: 0;
  border-start-start-radius: 0;
  border-start-end-radius: 0;
}

/* ═══════════════════════════════════════════
   Responsive — Mobile
   ═══════════════════════════════════════════ */
@media screen and (max-width: 56rem) {
  .book-menu {
    visibility: hidden;
    margin-inline-start: -16rem;
    z-index: 1;
  }
  .book-menu .book-menu-content {
    background: var(--body-background);
  }
  .book-toc    { display: none; }
  .book-header { display: block; }
  .book-post-container { flex-direction: column-reverse; }

  #menu-control,
  #toc-control { display: inline; }

  #menu-control:checked ~ main .book-menu {
    visibility: initial;
  }
  #menu-control:checked ~ main .book-menu .book-menu-content {
    transform: translateX(16rem);
    box-shadow: 0 0 0.5rem rgba(0,0,0,.1);
  }
  #menu-control:checked ~ main .book-page { opacity: 0.25; }
  #menu-control:checked ~ main .book-menu-overlay {
    display: block;
    position: fixed;
    top: 0; bottom: 0; left: 0; right: 0;
  }

  #toc-control:checked ~ main .book-header aside { display: block; }
}

/* ═══════════════════════════════════════════
   Large screens
   ═══════════════════════════════════════════ */
@media screen and (min-width: 90rem) {
  main { gap: 1rem; padding: 1rem; }
  .book-menu .book-menu-content,
  .book-toc  .book-toc-content { top: 1rem; }
}

/* ═══════════════════════════════════════════
   Print
   ═══════════════════════════════════════════ */
@media print {
  .book-menu, .book-footer, .book-toc { display: none; }
  .book-header, .book-header aside    { display: block; }
  main { display: block !important; }
}