/* SiteGen theme — "cozy terminal / RPG manual"
 * Brown/teal palette, 2px ink borders, hard offset shadows.
 * Light: warm paper. Dark: deep coffee. Teal accent in both.
 */

@font-face {
  font-family: "Fira Code";
  src: url("/fonts/woff2/FiraCode-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Fira Code";
  src: url("/fonts/woff2/FiraCode-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #f4ede3;
  --bg-alt: #ece1cf;
  --card: #faf5ea;
  --fg: #33261e;
  --muted: #7a6653;
  --accent: #0f766e;
  --accent-fg: #f4ede3;
  --link: #0d6e66;
  --border: #33261e;
  --shadow: 4px 4px 0 var(--border);
  --code-bg: #efe6d5;
  --tok-string: #9a6a2f;
  --tok-number: #b3552e;
  --tok-type: #5f7a33;
  --tok-deletion: #a63a3a;
  --serif: ui-serif, Georgia, "Times New Roman", serif;
  --sans:
    system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, Cantarell, sans-serif;
  --mono: "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #191310;
    --bg-alt: #221a15;
    --card: #211a15;
    --fg: #ece1d3;
    --muted: #a89684;
    --accent: #2dd4bf;
    --accent-fg: #191310;
    --link: #2dd4bf;
    --border: #4a3b2e;
    --code-bg: #171310;
    --tok-string: #d9a05b;
    --tok-number: #e08a5a;
    --tok-type: #a8bf6e;
    --tok-deletion: #d97a6a;
  }
}

[data-theme="dark"] {
  --bg: #191310;
  --bg-alt: #221a15;
  --card: #211a15;
  --fg: #ece1d3;
  --muted: #a89684;
  --accent: #2dd4bf;
  --accent-fg: #191310;
  --link: #2dd4bf;
  --border: #4a3b2e;
  --code-bg: #171310;
  --tok-string: #d9a05b;
  --tok-number: #e08a5a;
  --tok-type: #a8bf6e;
  --tok-deletion: #d97a6a;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 18px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.25;
}

h2,
h3 {
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.2em;
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card);
  border-bottom: 2px solid var(--border);
}

.site-header-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg);
}

.site-nav {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

.nav-link,
.nav-dropdown summary {
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.35rem 0.6rem;
  color: var(--fg);
  border: 2px solid transparent;
  cursor: pointer;
}

.nav-link:hover,
.nav-dropdown summary:hover {
  border-color: var(--border);
  text-decoration: none;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  right: 0;
  min-width: 16rem;
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.nav-dropdown-menu a {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
}

.nav-dropdown-menu a:last-child {
  border-bottom: 0;
}

.header-tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-nav {
  display: flex;
  gap: 0.25rem;
}

.lang-link {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border: 2px solid var(--border);
}

.lang-link.is-active {
  background: var(--accent);
  color: var(--accent-fg);
}

.icon,
.icon-stroke {
  width: 1.25rem;
  height: 1.25rem;
  display: block;
}

.icon {
  fill: currentColor;
}

.icon-stroke {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

.icon-link,
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
}

.icon-btn:hover,
.icon-link:hover {
  background: var(--bg-alt);
}

#theme-toggle::before {
  content: "☾";
  font-size: 1.1rem;
}

[data-theme="dark"] #theme-toggle::before {
  content: "☀";
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) #theme-toggle::before {
    content: "☀";
  }
}

/* ---------- drawer (mobile nav) ---------- */

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(25, 19, 16, 0.5);
  display: none;
}

.drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 31;
  width: 18rem;
  max-width: 85vw;
  background: var(--card);
  border-right: 2px solid var(--border);
  transform: translateX(-100%);
  transition: transform 150ms ease-out;
  padding: 1rem;
}

.drawer-backdrop.shown {
  display: block;
}

.drawer.shown {
  transform: translateX(0);
}

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

.drawer-list li a {
  display: block;
  padding: 0.4rem 0.25rem;
  border-bottom: 1px solid var(--border);
}

/* ---------- layout ---------- */

main {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

.hero {
  margin: 2rem 0;
  padding: 3rem 2rem;
  text-align: center;
  background:
    linear-gradient(rgba(25, 19, 16, 0.55), rgba(25, 19, 16, 0.55)),
    url("/img/banner.jpg") center / cover;
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
  color: #f4ede3;
}

.hero-inner {
  max-width: 46rem;
  margin: 0 auto;
}

.hero h1 {
  margin: 0;
  font-size: 2.2rem;
}

.hero-subtitle {
  margin: 0.5rem 0 0;
  font-family: var(--mono);
  font-size: 0.95rem;
}

/* ---------- cards ---------- */

.section {
  margin: 1.5rem 0;
}

.card-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card {
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.5rem;
}

.card-title {
  margin: 0;
  border-bottom: 0;
  padding-bottom: 0;
  font-size: 1.35rem;
}

.card-meta,
.post-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin: 0.35rem 0;
}

.card-abstract {
  margin: 0.5rem 0;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  margin: 0.5rem 0 0;
}

.tag {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.1rem 0.4rem;
  border: 2px solid var(--accent);
  color: var(--link);
}

/* ---------- article page ---------- */

.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 17rem;
  gap: 2rem;
  margin-top: 2rem;
}

.post {
  min-width: 0;
}

.post-header h1 {
  margin-bottom: 0.25rem;
}

.post-subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  margin-top: 0;
}

.post-content img {
  max-width: 100%;
  border: 2px solid var(--border);
}

/* embedded tweets in older posts */
.post-content .twitter-tweet {
  margin-left: auto;
  margin-right: auto;
}

.post-content blockquote,
.post-feedback {
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  border-left: 4px solid var(--accent);
  background: var(--bg-alt);
}

.post-content pre {
  background: var(--code-bg);
  border: 2px solid var(--border);
  padding: 1rem;
  overflow-x: auto;
}

.post-content code {
  font-family: var(--mono);
  font-size: 0.85em;
}

.post-content :not(pre) > code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 0.1em 0.35em;
}

.post-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
}

.post-content th,
.post-content td {
  border: 2px solid var(--border);
  padding: 0.4rem 0.75rem;
}

.post-content th {
  background: var(--bg-alt);
}

/* heading anchor links: show a ¶ on hover via the auto-generated ids */
.post-content h2:hover::after,
.post-content h3:hover::after {
  content: " ¶";
  color: var(--accent);
}

/* ---------- sidebar ---------- */

.post-sidebar {
  font-size: 0.85rem;
}

.toc,
.all-posts {
  background: var(--card);
  border: 2px solid var(--border);
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.toc {
  position: sticky;
  top: 4.5rem;
}

.toc-title {
  font-family: var(--mono);
  font-weight: 700;
  margin: 0 0 0.5rem;
  border-bottom: 2px solid var(--accent);
}

.toc-list {
  margin: 0;
  padding-left: 1.1rem;
}

.toc-level-1,
.toc-level-2 {
  list-style: none;
  margin-left: -1.1rem;
}

.toc-level-3 {
  margin-left: 0.25rem;
}

.all-posts-list {
  display: flex;
  flex-direction: column;
  max-height: 24rem;
  overflow-y: auto;
}

.all-posts-list a {
  padding: 0.25rem 0.4rem;
  border-left: 3px solid transparent;
}

.all-posts-list a.is-active {
  border-left-color: var(--accent);
  background: var(--bg-alt);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 2px solid var(--border);
  background: var(--card);
  text-align: center;
  padding: 1.5rem 1rem 2.5rem;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.muted {
  color: var(--muted);
  font-size: 0.75rem;
}

/* ---------- highlight.js token palette (matches the theme) ---------- */

.hljs {
  color: var(--fg);
  background: transparent;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-meta {
  color: var(--accent);
  font-weight: 700;
}

.hljs-string,
.hljs-regexp,
.hljs-addition {
  color: var(--tok-string);
}

.hljs-comment,
.hljs-quote {
  color: var(--muted);
  font-style: italic;
}

.hljs-number,
.hljs-literal,
.hljs-built_in,
.hljs-variable.constant_ {
  color: var(--tok-number);
}

/* function names, type declarations, attribute/annotation names */
.hljs-title,
.hljs-name,
.hljs-attr,
.hljs-selector-id,
.hljs-selector-class {
  color: var(--link);
}

/* primitive types (int, string, ...), generic params ('T, ^T) */
.hljs-type,
.hljs-symbol,
.class_,
.hljs-selector-attr,
.hljs-selector-pseudo {
  color: var(--tok-type);
}

/* keep operators and punctuation quiet so keywords stand out */
.hljs-operator,
.hljs-punctuation,
.hljs-bullet {
  color: var(--muted);
}

/* interpolation holes and plain identifiers stay at body color */
.hljs-variable,
.hljs-template-variable,
.hljs-subst {
  color: var(--fg);
}

.hljs-section {
  color: var(--accent);
  font-weight: 700;
}

.hljs-deletion {
  color: var(--tok-deletion);
}

.hljs-emphasis {
  font-style: italic;
}

.hljs-strong {
  font-weight: 700;
}

.hljs-formula {
  background: var(--bg-alt);
}

/* ---------- responsive ---------- */

@media (min-width: 48rem) {
  .site-nav {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }
}

@media (max-width: 56rem) {
  .post-layout {
    grid-template-columns: 1fr;
  }

  .post-sidebar {
    order: -1;
  }

  .toc {
    position: static;
  }
}