/* =========================================================
   Localize Blog — daring-fireball-inspired stylesheet
   Light + dark themes, WCAG-AA/AAA contrast, no JS framework.
   ========================================================= */

:root {
  --font-body: Verdana, "Lucida Grande", "DejaVu Sans", sans-serif;
  --font-title: "Gill Sans", "Gill Sans MT", Calibri, "Trebuchet MS", sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --measure: 32rem;            /* main text column */
  --sidebar-width: 12rem;      /* left sidebar */
  --layout-gap: 2.5rem;         /* gap between sidebar and main */
  --masthead-measure: calc(var(--sidebar-width) + var(--layout-gap) + var(--measure));

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
}

/* ---------- Light theme (default) ---------- */
:root,
html[data-theme="light"] {
  --bg: #fbfaf7;
  --bg-alt: #f4eef9;
  --text: #1b1720;
  --text-muted: #524a5b;
  --rule: #d9d2e0;
  --link: #6d2c91;
  --link-visited: #4b2466;
  --link-hover: #872fb3;
  --accent: #5b2a86;
  --code-bg: #f2edf7;
  --code-border: #ddd0ec;
  --selection-bg: #e8d6f5;

  /* Makeup syntax tokens — light */
  --hl-keyword: #6d2c91;   /* keyword, operator-word */
  --hl-string:  #7a3e12;
  --hl-comment: #6b6071;
  --hl-number:  #2c5a2d;
  --hl-atom:    #1e4a8b;
  --hl-func:    #3d1a54;
  --hl-punct:   #3a3140;
}

/* ---------- Dark theme ---------- */
html[data-theme="dark"] {
  --bg: #15121a;
  --bg-alt: #1e1827;
  --text: #ece6f2;
  --text-muted: #a79cb2;
  --rule: #3a2f48;
  --link: #c9a4ec;
  --link-visited: #bb9fde;
  --link-hover: #e1c5f5;
  --accent: #b491d9;
  --code-bg: #221a2b;
  --code-border: #3a2f48;
  --selection-bg: #4a2e6b;

  --hl-keyword: #d7a7f5;
  --hl-string:  #e8b87a;
  --hl-comment: #8a7e96;
  --hl-number:  #9ed697;
  --hl-atom:    #8fb8f0;
  --hl-func:    #f0d7ff;
  --hl-punct:   #c2b7cf;
}

/* ---------- Base ---------- */

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

html {
  background: var(--bg);
  color: var(--text);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  background: var(--bg);
  color: var(--text);
}

::selection {
  background: var(--selection-bg);
  color: var(--text);
}

/* ---------- Accessibility helpers ---------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-3);
  background: var(--accent);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  text-decoration: none;
  z-index: 100;
  border-radius: 3px;
}

.skip-link:focus {
  top: var(--space-3);
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

main:focus {
  outline: none;
}

/* ---------- Masthead ---------- */

.masthead {
  border-bottom: 1px solid var(--rule);
  padding: var(--space-5) var(--space-3) var(--space-4);
  margin-bottom: var(--space-5);
}

.masthead-inner {
  max-width: var(--masthead-measure);
  margin: 0 auto;
}

.masthead-heading {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.site-logo-link {
  display: inline-flex;
  flex-shrink: 0;
  border-radius: 6px;
}

.site-logo-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.site-logo {
  display: block;
  width: auto;
  /* Matches the combined height of .site-title + .tagline so the logo's
     top edge aligns with the title and its bottom edge aligns with the
     tagline baseline. */
  height: 4.25rem;
}

.masthead-text {
  min-width: 0;
  flex: 1;
}

.site-title {
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 2.25rem;
  line-height: 1.1;
  margin: 0;
  letter-spacing: -0.01em;
}

.site-title a {
  color: var(--text);
  text-decoration: none;
}

.site-title a:hover,
.site-title a:focus-visible {
  color: var(--accent);
}

.tagline {
  font-style: italic;
  color: var(--text-muted);
  margin: var(--space-1) 0 0;
  font-size: 0.95rem;
}

.primary-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  font-family: var(--font-title);
  font-size: 0.95rem;
}

.primary-nav a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--link-hover);
  border-bottom-color: currentColor;
}

.theme-toggle {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--text);
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 120ms ease, border-color 120ms ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: var(--bg-alt);
  border-color: var(--accent);
}

/* ---------- Layout: sidebar + main ---------- */

.layout {
  max-width: var(--masthead-measure);
  margin: 0 auto;
  padding: 0 var(--space-3) var(--space-6);
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: var(--layout-gap);
  align-items: start;
}

.main {
  max-width: var(--measure);
  min-width: 0;
}

/* ---------- Sidebar ---------- */

.sidebar {
  font-family: var(--font-title);
  font-size: 0.88rem;
  line-height: 1.4;
  color: var(--text-muted);
  position: sticky;
  top: var(--space-3);
}

.sidebar nav + nav {
  margin-top: var(--space-4);
}

.sidebar-heading {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--rule);
  font-weight: 600;
}

.sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-list li {
  margin-bottom: var(--space-3);
}

.sidebar-list li:last-child {
  margin-bottom: 0;
}

.sidebar-list a {
  color: var(--link);
  text-decoration: none;
  font-weight: 600;
  display: inline-block;
}

.sidebar-list a:hover,
.sidebar-list a:focus-visible {
  color: var(--link-hover);
  text-decoration: underline;
}

.sidebar-list a:visited {
  color: var(--link-visited);
}

.sidebar-note {
  display: block;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 400;
  font-style: italic;
  margin-top: 0.1rem;
}

/* ---------- Index: post list ---------- */

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

.post-list-item {
  padding-bottom: var(--space-5);
  margin-bottom: var(--space-5);
}

.post-list-item:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
}

.post-list-title {
  font-family: var(--font-title);
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0 0 var(--space-1);
  font-weight: 600;
}

.post-list-title a {
  color: var(--link);
  text-decoration: none;
}

.post-list-title a:hover,
.post-list-title a:focus-visible {
  text-decoration: underline;
  color: var(--link-hover);
}

.post-list-title a:visited {
  color: var(--link-visited);
}

.post-meta {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0 0 var(--space-3);
}

.post-meta .sep {
  margin: 0 0.4em;
}

.post-summary {
  margin: var(--space-2) 0 0;
}

/* ---------- Category tags ---------- */

.post-tags {
  margin: var(--space-3) 0 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-title);
  line-height: 1.4;
}

.post-tags-label {
  margin-right: 0.3em;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.post-tag {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
  padding-bottom: 0.05em;
}

.post-tag:hover,
.post-tag:focus-visible {
  color: var(--link-hover);
  border-bottom-style: solid;
}

.post-tag:visited {
  color: var(--link-visited);
}

.post-tags-sep {
  color: var(--text-muted);
}

/* Category landing page */
.category-header {
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--rule);
}

.category-eyebrow {
  font-family: var(--font-title);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 var(--space-1);
}

.category-title {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 var(--space-1);
  line-height: 1.1;
  color: var(--accent);
}

.category-count {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ---------- Post page ---------- */

.post-header {
  margin-bottom: var(--space-4);
}

.post-title {
  font-family: var(--font-title);
  font-size: 1.8rem;
  line-height: 1.2;
  margin: 0 0 var(--space-2);
  font-weight: 600;
  color: var(--link);
}

.post-body {
  font-size: 15px;
}

.post-body p {
  margin: 0 0 var(--space-3);
}

.post-body h2,
.post-body h3,
.post-body h4 {
  font-family: var(--font-title);
  font-weight: 600;
  line-height: 1.25;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.post-body h2 { font-size: 1.35rem; }
.post-body h3 { font-size: 1.15rem; }
.post-body h4 { font-size: 1rem; }

.post-body a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.post-body a:visited { color: var(--link-visited); }
.post-body a:hover,
.post-body a:focus-visible { color: var(--link-hover); }

.post-body ul,
.post-body ol {
  padding-left: var(--space-4);
  margin: 0 0 var(--space-3);
}

.post-body li { margin-bottom: var(--space-1); }

.post-body blockquote {
  margin: 0 0 var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-left: 3px solid var(--accent);
  color: var(--text-muted);
  background: var(--bg-alt);
}

.post-body hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: var(--space-5) 0;
}

.post-nav {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------- Code blocks ---------- */

.post-body code,
.post-body pre {
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.post-body code {
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  border: 1px solid var(--code-border);
}

.post-body pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-left: 3px solid var(--accent);
  padding: var(--space-3);
  overflow-x: auto;
  line-height: 1.45;
  margin: 0 0 var(--space-3);
}

.post-body pre code {
  background: none;
  padding: 0;
  border: 0;
}

/* Makeup token classes. Full list: https://hexdocs.pm/makeup/Makeup.Lexer.html */
.highlight .k,
.highlight .kd,
.highlight .kn,
.highlight .kp,
.highlight .kr,
.highlight .kt,
.highlight .ow { color: var(--hl-keyword); font-weight: 600; }
.highlight .s,
.highlight .s1,
.highlight .s2,
.highlight .sb,
.highlight .sc,
.highlight .sd,
.highlight .se,
.highlight .sh,
.highlight .si,
.highlight .sx,
.highlight .sr,
.highlight .ss { color: var(--hl-string); }
.highlight .c,
.highlight .c1,
.highlight .cm,
.highlight .cp,
.highlight .cs { color: var(--hl-comment); font-style: italic; }
.highlight .m,
.highlight .mf,
.highlight .mh,
.highlight .mi,
.highlight .mo,
.highlight .il { color: var(--hl-number); }
.highlight .na,
.highlight .no,
.highlight .nb,
.highlight .nc { color: var(--hl-atom); }
.highlight .nf,
.highlight .nv { color: var(--hl-func); }
.highlight .p,
.highlight .o { color: var(--hl-punct); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--rule);
  padding: var(--space-4) var(--space-3);
  margin-top: var(--space-6);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.site-footer a { color: var(--link); }

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* ---------- Narrower screens: collapse sidebar below main ---------- */

@media (max-width: 52rem) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    max-width: var(--measure);
  }

  .sidebar {
    position: static;
    order: 2;
    margin-top: var(--space-5);
    padding-top: var(--space-4);
    border-top: 1px solid var(--rule);
  }

  .main {
    order: 1;
    max-width: none;
  }
}

/* ---------- Small screens ---------- */

@media (max-width: 38rem) {
  body { font-size: 16px; }
  .site-title { font-size: 1.75rem; }
  .post-title { font-size: 1.5rem; }
  .masthead { padding: var(--space-4) var(--space-3) var(--space-3); }
  .site-logo { height: 3.5rem; }
  .masthead-heading { gap: var(--space-2); }
}