/* ==========================================================================
   Theme: personal
   Serif body copy, grotesque headers, solarized-light code, Tufte sidenotes.
   ========================================================================== */

:root {
  /* -- Palette (solarized light) ------------------------------------------ */
  --bg:            #fdf6e3; /* solarized base3 */
  --bg-raised:     #eee8d5; /* solarized base2 */
  --rule:          #ddd6c1;
  --text:          #3a3a34; /* dark warm gray */
  --text-muted:    #5c5c53;
  --heading:       var(--text);
  --link:          #268bd2; /* solarized blue */
  --link-visited:  #6c71c4; /* solarized violet */
  --accent:        #cb4b16; /* solarized orange, used sparingly */

  /* -- Type ---------------------------------------------------------------- */
  --font-serif: "Charter", Georgia, Cambria, "Times New Roman", serif;
  --font-sans:  "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-mono:  "Fira Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* -- Layout --------------------------------------------------------------
     `--measure` is the width of the main text column, tuned so a serif body
     face lands around 80-100 characters per line. `--sidenote-w` and `--gap`
     are the margin column used for Tufte-style side notes. */
  --measure:    46rem;
  --sidenote-w: 15rem;
  --gap:        2.5rem;
}

/* Dark mode: gruvbox counterparts of the palette above. Applied when
   <html data-theme="dark"> (set by js/theme.js from the saved choice or the
   OS preference). */
:root[data-theme="dark"] {
  --bg:            #282828; /* gruvbox bg0 */
  --bg-raised:     #3c3836; /* gruvbox bg1 */
  --rule:          #504945; /* gruvbox bg2 */
  --text:          #ebdbb2; /* gruvbox fg1 */
  --text-muted:    #a89984; /* gruvbox gray */
  --link:          #83a598; /* gruvbox bright blue */
  --link-visited:  #d3869b; /* gruvbox bright purple */
  --accent:        #fe8019; /* gruvbox bright orange */
  color-scheme: dark;
}

/* -- Reset ----------------------------------------------------------------- */

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

html {
  font-size: 106%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}
a:visited { color: var(--link-visited); }
a:hover { color: var(--accent); }

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

/* -- Page scaffold ----------------------------------------------------------
   The page is wider than the text column on purpose: the extra space on
   both sides is where side notes live, and it keeps the reading column a
   comfortable width regardless of viewport. */

.page {
  max-width: calc(var(--measure) + var(--gap) + var(--sidenote-w) + 6rem);
  margin: 0 auto;
  padding: 0 3rem;
}

.main { padding-bottom: 4rem; }

/* -- Header / nav ------------------------------------------------------------ */

.site-header {
  position: relative;
  padding: 3rem 0 0;
  margin-bottom: 2.5rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}
.brand-mark {
  flex: none;
  width: 3.4rem;
  height: 3.4rem;
  color: var(--text-muted);
}

.site-title,
.site-title:visited {
  font-family: var(--font-serif);
  font-weight: 400;
  font-variant: small-caps;
  font-size: 1.9rem;
  color: var(--heading);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.site-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0.4rem 0 0;
}

.site-nav {
  margin-top: 1.4rem;
  border-top: 1px solid var(--text);
  border-bottom: 1px solid var(--text);
  padding: 0.55rem 0;
  /* Same two columns as the article: links centered over the text column,
     theme toggle in the side-note column. The rules span the full width. */
  display: grid;
  grid-template-columns: var(--measure) var(--sidenote-w);
  column-gap: var(--gap);
  align-items: baseline;
}
.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem 1.8rem;
  padding: 0;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.site-nav li { position: relative; }
.site-nav li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -0.9rem; /* middle of the column gap */
  width: 4px;
  height: 4px;
  margin: -2px -2px 0 0;
  border-radius: 50%;
  background: var(--text-muted);
}
.site-nav a,
.site-nav a:visited {
  color: var(--text);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding: 1.5rem 0;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* -- Headings ---------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--heading);
  font-weight: 700;
  line-height: 1.25;
  margin: 2.2em 0 0.6em;
  letter-spacing: -0.01em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
h4, h5, h6 { font-size: 1rem; }

/* -- The "- o -" motif above a post title ------------------------------------ */

.motif {
  text-align: center;
  font-family: var(--font-sans);
  color: var(--text-muted);
  margin: 0 0 1.5rem;
  line-height: 1;
}
.motif svg { width: 12rem; height: auto; }
.article-footer { margin-top: 3rem; }
.article-footer .motif { margin-bottom: 0; }

/* -- Article shell: wide, with the text column left-aligned so there is a
   consistent right-hand margin for side notes to float into. ---------------- */

.article-header,
.toc,
.article-content > *,
.home-intro > *,
.list-header,
.article-footer,
.post-list {
  max-width: var(--measure);
}

.article-title {
  font-size: 2.2rem;
  text-align: center;
  margin-top: 0;
}

.article-meta {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 0.5rem;
}
.article-meta a.tag { color: var(--text-muted); text-decoration: underline; }
.article-meta .meta-sep { margin: 0 0.4em; }

/* -- Table of contents -------------------------------------------------------- */

.toc {
  background: var(--bg-raised);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 1.1rem 1.4rem;
  margin: 0 0 2.5rem;
  font-family: var(--font-serif);
  font-size: 1rem;
}

.toc-title {
  margin: 0 0 0.5rem;
  font-weight: 700;
  font-variant: small-caps;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.toc ul {
  list-style: none;
  margin: 0;
  padding-left: 0;
}
.toc ul ul { padding-left: 1.1rem; }
.toc li { margin: 0.25rem 0; }
.toc #TableOfContents > ul > li > a {
  font-variant: small-caps;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.toc ul ul a { font-style: italic; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }

/* -- Prose -------------------------------------------------------------------- */

.article-content p,
.article-content ul,
.article-content ol,
.article-content blockquote,
.home-intro p {
  margin: 0 0 1.3em;
}

.article-content blockquote {
  margin-left: 0;
  padding-left: 1.2em;
  border-left: 3px solid var(--rule);
  color: var(--text-muted);
  font-style: italic;
}

.article-content ul, .article-content ol { padding-left: 1.4em; }

table {
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95em;
  max-width: var(--measure);
}
th, td {
  border: 1px solid var(--rule);
  padding: 0.4em 0.8em;
  text-align: left;
}
th { font-family: var(--font-sans); background: var(--bg-raised); }

/* -- Code ----------------------------------------------------------------------
   Inline code and fenced blocks use Fira Mono. Fenced blocks are colored by
   Chroma's solarized-light style (see css/chroma.css); this file only sets
   font and spacing so the two stay in sync. */

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-raised);
  border-radius: 3px;
  padding: 0.1em 0.3em;
}

pre {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.55;
  overflow-x: auto;
  border-radius: 6px;
  border: 1px solid var(--rule);
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

.chroma {
  padding: 1rem 1.2rem;
  border-radius: 6px;
  border: 1px solid var(--rule);
}

/* -- Lists of posts (home page and section lists) ------------------------------ */

.list-title {
  font-size: 2.2rem;
  text-align: center;
  margin-top: 0;
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
}

.post-list-item {
  padding: 1.3rem 0;
  border-top: 1px solid var(--rule);
}
.post-list-item:first-child { border-top: none; }

.post-list-title {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 700;
  font-size: 1.3rem;
  text-decoration: none;
  color: var(--heading);
}
.post-list-title:visited { color: var(--heading); }
.post-list-title:hover { color: var(--accent); }

.post-list-date {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.post-list-summary {
  margin: 0.6rem 0 0;
  color: var(--text-muted);
}

/* -- Pagination ------------------------------------------------------------ */

.pagination {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  display: flex;
  gap: 1.5rem;
  margin-top: 2rem;
}

/* ==========================================================================
   Tufte-style side notes.

   Hugo's Goldmark renderer emits standard footnotes (a <sup> reference in
   the text, and a list at the bottom of the article). js/sidenotes.js walks
   that markup at load time and moves each definition into a floated side
   note positioned right where its reference occurs, leaving the bottom list
   as a progressive-enhancement fallback for no-JS / narrow-screen contexts.
   ========================================================================== */

.footnotes {
  max-width: var(--measure);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
  margin-top: 2rem;
}

/* .footnotes is hidden by sidenotes.js (via the `hidden` attribute) once it
   has successfully moved the notes into the margin; without JS it's left
   visible as a normal footnote list. */

.sidenote-ref {
  font-family: var(--font-sans);
  font-size: 0.75em;
  vertical-align: super;
  color: var(--accent);
  text-decoration: none;
  cursor: pointer;
  padding: 0 0.1em;
}

.sidenote-toggle { display: none; }
.sidenote-checkbox { display: none; }

.sidenote {
  float: right;
  clear: right;
  width: var(--sidenote-w);
  margin-right: calc(-1 * (var(--sidenote-w) + var(--gap)));
  margin-top: 0.15em;
  margin-bottom: 0.5em;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-muted);
}
.sidenote .sidenote-number {
  font-weight: 700;
  color: var(--accent);
  margin-right: 0.3em;
}
.sidenote p { margin: 0; display: inline; }
.sidenote p + p { display: block; margin-top: 0.5em; }

@media (max-width: 920px) {
  .sidenote {
    float: none;
    clear: both;
    display: none;
    width: auto;
    margin: 0.6rem 0 0.6rem 0;
    padding: 0.5rem 0 0.5rem 0.9rem;
    border-left: 2px solid var(--rule);
  }
  .sidenote-toggle {
    display: inline;
    color: var(--accent);
    text-decoration: underline;
    cursor: pointer;
    font-size: 0.8em;
    font-family: var(--font-sans);
  }
  .sidenote-checkbox:checked ~ .sidenote { display: block; }
}

@media print {
  .sidenote-toggle { display: none; }
  .sidenote {
    float: none;
    display: block;
    width: auto;
    margin: 0.4em 0;
    border-left: 2px solid var(--rule);
    padding-left: 0.8em;
  }
}

/* -- Small screens: collapse the wide margins ------------------------------- */

@media (max-width: 920px) {
  .site-nav { grid-template-columns: 1fr auto; column-gap: 1rem; }
  .theme-toggle { justify-self: end; }
  .page { padding: 0 1.25rem; }
  .article-title { font-size: 1.7rem; }
}

/* -- Theme toggle ------------------------------------------------------------- */

.theme-toggle {
  justify-self: end;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-muted);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.theme-toggle:hover { color: var(--accent); text-decoration: underline; }
@media print { .theme-toggle { display: none; } }