/* ============================================================================
   FOLIATE - Default Stylesheet
   A minimal, themeable stylesheet for foliate static sites.
   ============================================================================ */

/* ============================================================================
   CSS VARIABLES - Customize these to theme your site
   ============================================================================ */

:root {
  /* Primary Colors */
  --color-primary: #006d77;
  --color-primary-dark: #006d77;
  --color-secondary: #83c5be;
  --color-accent: #edf6f9;

  /* Typography */
  --font-family-sans: "Inter", "SF Pro Display", "Helvetica Neue", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-family-serif: Palatino, "Palatino Linotype", "Book Antiqua", Georgia, serif;

  /* Neutral Colors */
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --background-primary: #ffffff;
  --background-code: #f3f4f6;
  --border-light: #e5e7eb;
  --border-medium: #d1d5db;
}

/* ============================================================================
   BASE TYPOGRAPHY & LAYOUT
   ============================================================================ */

html {
  font-size: 16px;
  overflow-x: hidden;
}

body {
  width: 90%;
  max-width: 800px;
  padding: 0 5%;
  margin: 0 auto;
  font-family: var(--font-family-sans);
  font-size: 1.1rem;
  background-color: var(--background-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* ============================================================================
   LAYOUT COMPONENTS
   ============================================================================ */

article {
  padding: 3rem 0;
  width: 100%;
}

section {
  padding: 1rem 0;
  width: 100%;
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */

p {
  margin: 1.4rem 0;
  width: 100%;
}

h1 + p {
  margin-top: 0.6rem;
}

header h1 {
  font-size: 1.7rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

section h1, .content h1, h1 {
  font-size: 1.6rem;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-top: 1.5rem;
  margin-bottom: 0.8rem;
}

h2 {
  font-family: var(--font-family-sans);
  color: var(--color-secondary);
  font-style: normal;
  font-weight: normal;
  font-size: 1.4rem;
}

h3 {
  font-family: var(--font-family-sans);
  color: var(--text-secondary);
  font-style: normal;
  font-size: 1.25rem;
}

h4 {
  color: var(--color-primary);
  font-style: normal;
  font-size: 1.15rem;
}

h5 {
  color: var(--color-secondary);
  font-style: normal;
  font-size: 1.1rem;
}

h6 {
  color: var(--color-secondary);
  font-style: normal;
  font-size: 1.05rem;
}

/* ============================================================================
   LISTS
   ============================================================================ */

ul, ol {
  padding-left: 2rem;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

li:not(:first-child) {
  margin-top: 0.25rem;
}

li {
  overflow-wrap: break-word;
  word-wrap: break-word;
  hyphens: auto;
}

/* ============================================================================
   BLOCK ELEMENTS
   ============================================================================ */

blockquote {
  margin: 1.4rem 0;
  padding-left: 2rem;
  border-left: 3px solid var(--text-muted);
  font-style: italic;
}

table {
  margin: 1.4rem 0;
  border-collapse: collapse;
  width: 100%;
}

th, td {
  padding: 0.5rem;
  border: 1px solid var(--border-light);
  text-align: left;
}

th {
  background-color: var(--background-code);
}

hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 2rem 0;
}

/* ============================================================================
   IMAGES & FIGURES
   ============================================================================ */

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

.content p > img {
  display: block;
  margin-left: auto;
  margin-right: auto;
  max-width: 100%;
  height: auto;
  box-sizing: border-box;
}

figure {
  margin: 2rem 0;
  padding: 0;
  max-width: 100%;
  overflow-x: auto;
}

figcaption {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
}

/* ============================================================================
   CODE BLOCKS
   ============================================================================ */

pre {
  margin: 1.4rem 0;
  padding: 1rem;
  background: var(--background-code);
  border-radius: 4px;
  overflow-x: auto;
}

pre > code {
  font-size: 0.9rem;
  display: block;
}

code {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
}

.codehilite,
.highlight {
  width: 100%;
  padding: 0;
  background: var(--background-code);
  border-radius: 4px;
  margin: 1.4rem 0;
  overflow-x: auto;
}

.codehilite pre,
.highlight pre {
  margin: 0;
  padding: 1rem;
  background: none;
  border-radius: 0;
  border: none;
}

.codehilite code,
.highlight code {
  background: none !important;
  border: none;
  padding: 0;
}

/* Pygments syntax highlighting (friendly theme) */
.highlight .c { color: #60A0B0; font-style: italic } /* Comment */
.highlight .err { border: 1px solid #F00 } /* Error */
.highlight .k { color: #007020; font-weight: bold } /* Keyword */
.highlight .o { color: #666 } /* Operator */
.highlight .ch { color: #60A0B0; font-style: italic } /* Comment.Hashbang */
.highlight .cm { color: #60A0B0; font-style: italic } /* Comment.Multiline */
.highlight .cp { color: #007020 } /* Comment.Preproc */
.highlight .c1 { color: #60A0B0; font-style: italic } /* Comment.Single */
.highlight .cs { color: #60A0B0; background-color: #FFF0F0 } /* Comment.Special */
.highlight .gd { color: #A00000 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #F00 } /* Generic.Error */
.highlight .gh { color: #000080; font-weight: bold } /* Generic.Heading */
.highlight .gi { color: #00A000 } /* Generic.Inserted */
.highlight .go { color: #888 } /* Generic.Output */
.highlight .gp { color: #C65D09; font-weight: bold } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
.highlight .gt { color: #04D } /* Generic.Traceback */
.highlight .kc { color: #007020; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #007020; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #007020; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #007020 } /* Keyword.Pseudo */
.highlight .kr { color: #007020; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #902000 } /* Keyword.Type */
.highlight .m { color: #40A070 } /* Literal.Number */
.highlight .s { color: #4070A0 } /* Literal.String */
.highlight .na { color: #4070A0 } /* Name.Attribute */
.highlight .nb { color: #007020 } /* Name.Builtin */
.highlight .nc { color: #0E84B5; font-weight: bold } /* Name.Class */
.highlight .no { color: #60ADD5 } /* Name.Constant */
.highlight .nd { color: #555; font-weight: bold } /* Name.Decorator */
.highlight .ni { color: #D55537; font-weight: bold } /* Name.Entity */
.highlight .ne { color: #007020 } /* Name.Exception */
.highlight .nf { color: #06287E } /* Name.Function */
.highlight .nl { color: #002070; font-weight: bold } /* Name.Label */
.highlight .nn { color: #0E84B5; font-weight: bold } /* Name.Namespace */
.highlight .nt { color: #062873; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #BB60D5 } /* Name.Variable */
.highlight .ow { color: #007020; font-weight: bold } /* Operator.Word */
.highlight .w { color: #BBB } /* Text.Whitespace */
.highlight .mb { color: #40A070 } /* Literal.Number.Bin */
.highlight .mf { color: #40A070 } /* Literal.Number.Float */
.highlight .mh { color: #40A070 } /* Literal.Number.Hex */
.highlight .mi { color: #40A070 } /* Literal.Number.Integer */
.highlight .mo { color: #40A070 } /* Literal.Number.Oct */
.highlight .sa { color: #4070A0 } /* Literal.String.Affix */
.highlight .sb { color: #4070A0 } /* Literal.String.Backtick */
.highlight .sc { color: #4070A0 } /* Literal.String.Char */
.highlight .dl { color: #4070A0 } /* Literal.String.Delimiter */
.highlight .sd { color: #4070A0; font-style: italic } /* Literal.String.Doc */
.highlight .s2 { color: #4070A0 } /* Literal.String.Double */
.highlight .se { color: #4070A0; font-weight: bold } /* Literal.String.Escape */
.highlight .sh { color: #4070A0 } /* Literal.String.Heredoc */
.highlight .si { color: #70A0D0; font-style: italic } /* Literal.String.Interpol */
.highlight .sx { color: #C65D09 } /* Literal.String.Other */
.highlight .sr { color: #235388 } /* Literal.String.Regex */
.highlight .s1 { color: #4070A0 } /* Literal.String.Single */
.highlight .ss { color: #517918 } /* Literal.String.Symbol */
.highlight .bp { color: #007020 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #06287E } /* Name.Function.Magic */
.highlight .vc { color: #BB60D5 } /* Name.Variable.Class */
.highlight .vg { color: #BB60D5 } /* Name.Variable.Global */
.highlight .vi { color: #BB60D5 } /* Name.Variable.Instance */
.highlight .vm { color: #BB60D5 } /* Name.Variable.Magic */
.highlight .il { color: #40A070 } /* Literal.Number.Integer.Long */

/* ============================================================================
   LINKS
   ============================================================================ */

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

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

a.wikilink {
  color: var(--color-primary-dark);
  text-decoration: none;
}

a.wikilink:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

/* External links */
a[href^="http"]:not(.wikilink),
a[href^="https"]:not(.wikilink) {
  color: var(--text-secondary);
  text-decoration: none;
}

a[href^="http"]:not(.wikilink):hover,
a[href^="https"]:not(.wikilink):hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* Header anchor links */
.header-anchor {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 0.4em;
  font-weight: normal;
  opacity: 0;
  transition: opacity 0.15s ease-in-out;
}

h1:hover .header-anchor,
h2:hover .header-anchor,
h3:hover .header-anchor,
h4:hover .header-anchor,
h5:hover .header-anchor,
h6:hover .header-anchor {
  opacity: 1;
}

.header-anchor:hover {
  color: var(--color-secondary);
  text-decoration: none;
}

/* ============================================================================
   NAVIGATION
   ============================================================================ */

nav.top-nav {
  text-align: center;
  padding: 1.5rem 0 0.5rem 0;
  font-family: var(--font-family-sans);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 2rem;
}

nav.top-nav a {
  color: var(--color-primary);
  text-decoration: none;
  padding: 0 0.5rem;
}

nav.top-nav a:hover {
  color: var(--color-secondary);
}

nav.top-nav .nav-separator {
  color: var(--text-muted);
  padding: 0 0.25rem;
}

nav.top-nav .nav-logo {
  height: 1.3em;
  width: auto;
  vertical-align: middle;
  margin: 0 0.2rem 3px 0;
}

/* ============================================================================
   SEARCH  (opened with "/" or Cmd/Ctrl-K — no visible trigger)
   ============================================================================ */

.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(17, 24, 39, 0.35);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 10vh 1rem 1rem;
}

.search-overlay[hidden] {
  display: none;
}

.search-modal {
  width: 100%;
  max-width: 560px;
  background: var(--background-primary);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(17, 24, 39, 0.25);
  overflow: hidden;
}

.search-input {
  width: 100%;
  box-sizing: border-box;
  border: none;
  border-bottom: 1px solid var(--border-light);
  padding: 1rem 1.2rem;
  font-family: var(--font-family-sans);
  font-size: 1.1rem;
  color: var(--text-primary);
  background: var(--background-primary);
}

.search-input:focus {
  outline: none;
}

.search-results {
  list-style: none;
  margin: 0;
  padding: 0.4rem 0;
  max-height: 55vh;
  overflow-y: auto;
}

.search-results li {
  margin: 0;
  padding: 0;
}

.search-result {
  display: block;
  padding: 0.5rem 1.2rem;
  text-decoration: none;
  font-weight: 600;
  color: var(--color-primary);
}

.search-result:hover,
.search-result.is-active {
  background: var(--background-code);
}

.search-empty {
  padding: 1rem 1.2rem;
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

body.search-open {
  overflow: hidden;
}

/* ============================================================================
   FOOTER
   ============================================================================ */

.footer-separator {
  border-top: 1px solid var(--border-light);
  margin: 2rem 0 1rem 0;
}

footer {
  padding: 1rem 0 4rem 0;
}

.footer-text {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.page-dates {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-family-sans);
  margin: 0.3rem 0 1rem 0;
  font-weight: normal;
}

/* ============================================================================
   HOME PAGE SECTIONS
   ============================================================================ */

.recent-pages {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-medium);
}

.recent-pages h2 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--color-secondary);
}

.recent-pages ul.page-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0 0;
}

.recent-pages .page-list li {
  margin-bottom: 0.1rem;
  padding: 0.1rem 0;
  display: flex;
  align-items: baseline;
  gap: 2rem;
}

.recent-pages .page-list a {
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--color-primary);
}

.recent-pages .page-list a:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

.page-date {
  font-size: 1rem;
  color: var(--text-muted);
  flex-shrink: 0;
  white-space: nowrap;
  text-align: right;
  font-weight: normal;
  font-family: var(--font-family-mono);
  width: 10ch;
  display: inline-block;
  margin-left: 0.5rem;
}

.page-date--new {
  color: var(--color-primary);
}

/* ============================================================================
   KATEX MATH RENDERING
   ============================================================================ */

.katex-display {
  text-align: center;
  margin: 1em 0;
}

article .katex-display,
article .katex {
  width: auto;
  max-width: none;
  margin-left: 0;
  margin-right: 0;
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 768px) {
  body {
    width: 95%;
    padding: 0 2.5%;
    font-size: 1rem;
  }

  article {
    padding: 1.5rem 0;
  }

  nav.top-nav {
    padding: 0.5rem 0 0.3rem 0;
    margin-bottom: 0.8rem;
    font-size: 0.75rem;
    white-space: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  nav.top-nav a {
    padding: 0 0.15rem;
    display: inline-block;
  }

  nav.top-nav .nav-separator {
    padding: 0 0.05rem;
    font-size: 0.6rem;
  }

  nav.top-nav .nav-logo {
    height: 0.9em;
    margin: 0 0.1rem 1px 0;
  }

  .search-overlay {
    padding: 5vh 0.6rem 0.6rem;
  }

  header h1 {
    font-size: 1.4rem;
    margin-bottom: 0.3rem;
  }

  section h1, .content h1, h1 {
    font-size: 1.3rem;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
  }

  h2 {
    font-size: 1.2rem;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  h4 {
    font-size: 1.05rem;
  }

  h5, h6 {
    font-size: 1rem;
  }

  p {
    margin: 1rem 0;
  }

  .page-dates {
    font-size: 0.65rem;
    margin: 0.2rem 0 0.5rem 0;
  }

  ul, ol {
    padding-left: 1.2rem;
  }

  .footer-separator {
    margin: 1.5rem 0 0.5rem 0;
  }

  footer {
    padding: 0.5rem 0 2rem 0;
  }

  .footer-text {
    font-size: 0.85rem;
  }

  p, li, blockquote {
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
  }

  * {
    max-width: 100%;
    box-sizing: border-box;
  }

  a {
    overflow-wrap: break-word;
    word-wrap: break-word;
  }

  pre {
    overflow-x: auto;
    max-width: 100%;
    font-size: 0.85rem;
  }

  code {
    word-break: break-word;
    font-size: 0.9rem;
  }

  blockquote {
    margin: 1rem 0;
    padding-left: 1.5rem;
  }
}

/* ============================================================================
   FLOATING TABLE OF CONTENTS (build.floating_toc)
   Shown in the left gutter only when the viewport is wide enough.
   ============================================================================ */

.page-toc {
  display: none;
}

@media (min-width: 1320px) {
  /* Zero-height sticky box: sits at its flow position (top of .content),
     then follows the scroll; the .toc inside hangs into the left gutter. */
  .page-toc {
    display: block;
    position: sticky;
    top: 2rem;
    height: 0;
    font-size: 0.85rem;
    line-height: 1.4;
    color: #adadad;
  }

  .page-toc-toggle {
    display: block;
    position: absolute;
    top: 0;
    left: -240px;
    width: 220px;
    background: none;
    border: none;
    padding: 0 0 0.4rem 0;
    cursor: pointer;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: #c6c6c6;
  }

  .page-toc-toggle:hover {
    color: var(--text-secondary);
  }

  .page-toc .toc {
    width: 220px;
    margin-left: -240px;
    /* Align the first TOC entry with the first line of content: .content's
       1rem section padding + first paragraph's 1.4rem margin, minus the
       first li's 0.35rem margin, plus the leading difference between the
       two font sizes. Relative offset avoids margin collapse. */
    position: relative;
    top: 2.2rem;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
  }

  .page-toc--hidden .page-toc-body {
    display: none;
  }

  .page-toc .toc > ul {
    padding-left: 0;
  }

  .page-toc ul {
    list-style: none;
    margin: 0;
    padding-left: 0.9rem;
  }

  .page-toc li {
    margin: 0.35rem 0;
    width: auto;
  }

  .page-toc a {
    color: #adadad;
    text-decoration: none;
  }

  .page-toc a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
  }
}