/* ===== BrassinAI — Dark Theme with Tufte-style Sidenotes ===== */
:root {
  --bg: #0f1115;
  --bg-alt: #13151b;
  --card: #151821;
  --surface: #1c2030;
  --ink: #e8e6e3;
  --ink-light: #d0cec9;
  --muted: #8a90a0;
  --accent: #7cc7ff;
  --accent-hover: #a4daff;
  --accent-dim: rgba(124, 199, 255, 0.1);
  --border: #222631;
  --border-light: #2a2f3d;
  --highlight: rgba(124, 199, 255, 0.06);

  /* category colours */
  --cat-agentic: #f97316;
  --cat-rag: #23db38;
  --cat-multimodal: #a78bfa;
  --cat-hpc: #34d399;
  --cat-general: #60a5fa;

  /* typography */
  --font-heading: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Newsreader", "Georgia", "Times New Roman", serif;
  --font-ui: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;

  /* layout widths */
  --content-w: 680px;
  --margin-w: 260px;
  --gap: 48px;
}

/* ===== Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 17px;
  letter-spacing: 0.01em;
  font-feature-settings:
    "kern" 1,
    "liga" 1,
    "calt" 1;
}

/* ---- Links — subtle underline that pops on hover ---- */
a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 199, 255, 0.25);
  transition:
    color 0.15s,
    border-color 0.15s;
}
a:hover {
  color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
  text-decoration: none;
}

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

/* ===== Layout ===== */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 24px;
}

/* ===== Unified Site Header (Homepage + Blog) ===== */

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 20px 30px;
  background: var(--bg-alt);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  border-bottom: none;
}

.brand img {
  width: 26px;
  height: 26px;
  object-fit: contain;
  display: block;
}

.wordmark {
  font-size: 18px;
  font-weight: 600;
  font-family: var(--font-heading);
  color: var(--ink);
  letter-spacing: 0.4px;
}

/* Blog button highlighted (current focus) */
.site-nav a {
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
  text-decoration: none;
  transition: all 0.2s ease;
}

.site-nav a:hover {
  background: var(--accent);
  color: #000;
}

.site-nav a.active {
  background: var(--accent);
  color: #000;
}

/* ===== Filter Buttons (Homepage) ===== */
.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  font-family: var(--font-ui);
}
.filter-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  padding: 6px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-ui);
  letter-spacing: 0.02em;
  transition: all 0.2s;
}
.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ===== Blog Page Intro ===== */

.blog-intro {
  padding-top: 60px;
  padding-bottom: 40px;
}

.blog-hero {
  margin-bottom: 40px;
  text-align: left;
}

.blog-hero h1 {
  font-family: var(--font-heading);
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
  margin-bottom: 14px;
}

.blog-sub {
  font-family: var(--font-ui);
  font-size: 15px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ===== Post Grid (Homepage) ===== */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  transition:
    transform 0.15s,
    border-color 0.2s,
    box-shadow 0.2s;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}
.card h2 {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.35;
}
.card h2 a {
  color: var(--ink);
  border-bottom: none;
}
.card h2 a:hover {
  color: var(--accent);
  text-decoration: none;
}
.card p {
  color: var(--muted);
  font-size: 14.5px;
  margin-bottom: 14px;
  line-height: 1.6;
  font-family: var(--font-body);
}
.card .meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-family: var(--font-ui);
  color: var(--muted);
}

/* ===== Badges ===== */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-ui);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.badge-multimodal {
  background: rgba(167, 139, 250, 0.12);
  color: var(--cat-multimodal);
}
.badge-hpc {
  background: rgba(52, 211, 153, 0.12);
  color: var(--cat-hpc);
}
.badge-compiler {
  background: rgba(249, 115, 22, 0.12);
  color: var(--cat-compiler);
}
.badge-general {
  background: rgba(96, 165, 250, 0.12);
  color: var(--cat-general);
}


/* ======================================================================
   POST PAGE — Reading-optimized typography
   ====================================================================== */

/* ---- Back link ---- */
.back-link {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 20px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-bottom: none;
}
.back-link:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ---- Post Header ---- */
.post-header {
  max-width: var(--content-w);
  margin-bottom: 44px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}
.post-header h1 {
  font-family: var(--font-heading);
  font-size: 42px;
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.7px;
  margin-bottom: 14px;
  color: #fff;
}
.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-family: var(--font-ui);
  color: var(--muted);
  letter-spacing: 0.01em;
}

/* ---- Post Content — Newsreader body with generous rhythm ---- */
.post-content {
  max-width: var(--content-w);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.85;
  color: var(--ink-light);
  position: relative;
  letter-spacing: 0.01em;
}

/* Headings — Inter, tight tracking, generous vertical space */
.post-content h2 {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  margin: 56px 0 18px;
  color: #fff;
  letter-spacing: -0.4px;
  line-height: 1.25;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.post-content h3 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 600;
  margin: 44px 0 14px;
  color: var(--ink);
  letter-spacing: -0.2px;
  line-height: 1.3;
}
.post-content h4 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  margin: 36px 0 12px;
  color: var(--ink);
  letter-spacing: -0.1px;
  line-height: 1.35;
  text-transform: none;
}

/* Paragraphs — spacious rhythm */
.post-content p {
  margin-bottom: 24px;
  word-spacing: 0.02em;
}

/* Make first paragraph after a heading slightly larger for reading flow */
.post-content h2 + p,
.post-content h3 + p {
  font-size: 18.5px;
}

/* Lists */
.post-content ul,
.post-content ol {
  margin: 0 0 24px 28px;
}
.post-content li {
  margin-bottom: 8px;
  line-height: 1.75;
  padding-left: 4px;
}
.post-content li::marker {
  color: var(--accent);
}

/* Bold & emphasis */
.post-content strong {
  color: var(--ink);
  font-weight: 600;
}
.post-content em {
  font-style: italic;
  color: var(--ink);
}

/* Links inside content */
.post-content a {
  color: var(--accent);
  border-bottom: 1px solid rgba(124, 199, 255, 0.3);
  transition:
    color 0.15s,
    border-color 0.15s;
}
.post-content a:hover {
  color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
}

/* Blockquotes — warm, pulled-in feel */
.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 16px 24px;
  margin: 32px 0;
  margin-left: -8px;
  background: var(--highlight);
  border-radius: 0 10px 10px 0;
  color: var(--ink);
  font-style: italic;
  font-size: 19px;
  line-height: 1.7;
}
.post-content blockquote p:last-child {
  margin-bottom: 0;
}

/* Code — JetBrains Mono */
.post-content code {
  background: var(--surface);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 0.84em;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  color: var(--ink);
}
.post-content pre {
  background: var(--surface);
  padding: 20px 24px;
  border-radius: 10px;
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.65;
  font-family: var(--font-mono);
}
.post-content pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  color: inherit; /* let Rouge token colors take over */
}

/* Rouge wrapper — Jekyll wraps code in div.highlighter-rouge > div.highlight > pre.highlight */
.highlighter-rouge .highlight {
  background: var(--surface);
  border-radius: 10px;
}
div.highlighter-rouge {
  margin: 28px 0;
}
div.highlighter-rouge pre.highlight {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  margin: 0;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.65;
  font-family: var(--font-mono);
}
/* Language label */
div.highlighter-rouge::before {
  content: attr(class);
  display: block;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 8px 24px 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  margin-bottom: -1px;
  position: relative;
  z-index: 1;
}
div.highlighter-rouge pre.highlight {
  border-radius: 0 0 10px 10px;
}

/* Tables — clean, Inter for headers */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 15px;
}
.post-content th {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 2px solid var(--border-light);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.post-content td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--ink-light);
  font-size: 15.5px;
}
.post-content tr:hover td {
  background: var(--highlight);
}

/* Images */
.post-content img {
  border-radius: 10px;
  margin: 32px 0;
}

/* Horizontal rules — spacious */
.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 52px 0;
}

/* ---- Table of Contents — inline, placed via toc include ---- */
.toc {
  max-width: var(--content-w);
  margin: 28px 0 36px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0;
  overflow: hidden;
  font-family: var(--font-ui);
}
.toc details {
  padding: 18px 22px;
}
.toc summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.toc summary::-webkit-details-marker {
  display: none;
}
.toc summary::before {
  content: "▸";
  font-size: 12px;
  color: var(--muted);
  transition: transform 0.15s;
}
.toc details[open] summary::before {
  transform: rotate(90deg);
}
.toc summary h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin: 0;
  font-weight: 600;
}
.toc ol {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
}
.toc li {
  margin-bottom: 4px;
}
.toc li.toc-sub {
  padding-left: 16px;
}
.toc a {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
  display: block;
  padding: 3px 0;
  transition: color 0.15s;
}
.toc a:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ---- Sidenotes / Margin Notes (Tufte-style) ---- */
.sidenote-toggle {
  display: none;
}
.sidenote-label {
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  vertical-align: super;
  line-height: 0;
  margin-left: 2px;
}
.sidenote-content {
  float: right;
  clear: right;
  width: var(--margin-w);
  margin-right: calc(-1 * (var(--margin-w) + var(--gap)));
  margin-bottom: 16px;
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  position: relative;
}
/* Rich content inside sidenotes */
.sidenote-content p {
  margin-bottom: 8px;
  font-size: 13px;
  line-height: 1.55;
}
.sidenote-content p:last-child {
  margin-bottom: 0;
}
.sidenote-content img {
  border-radius: 6px;
  margin: 8px 0;
  width: 100%;
  height: auto;
}
.sidenote-content strong {
  color: var(--ink-light);
}
.sidenote-content em {
  font-style: italic;
}
.sidenote-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--surface);
  padding: 1px 5px;
  border-radius: 3px;
}
.sidenote-content ul,
.sidenote-content ol {
  margin: 6px 0 6px 16px;
  font-size: 13px;
}
.sidenote-content li {
  margin-bottom: 3px;
}
.sidenote-content a {
  border-bottom: 1px solid rgba(124, 199, 255, 0.25);
}
.sidenote-number {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  margin-right: 4px;
  font-family: var(--font-ui);
}

/* ---- References — end of article ---- */
.references {
  max-width: var(--content-w);
  margin-top: 52px;
  padding: 26px 28px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-family: var(--font-ui);
}
.references h3 {
  font-family: var(--font-heading);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 16px;
  font-weight: 600;
}
.references ol {
  padding-left: 20px;
  margin: 0;
}
.references li {
  font-size: 14px;
  margin-bottom: 10px;
  line-height: 1.55;
  color: var(--ink-light);
}
.references a {
  font-size: 14px;
  word-break: break-word;
}

/* ---- Post Footer ---- */
.post-footer {
  max-width: var(--content-w);
  margin-top: 60px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  font-family: var(--font-ui);
}
.post-footer a {
  font-weight: 600;
  font-size: 14px;
  border-bottom: none;
}

/* ===== Site Footer ===== */
.site-footer {
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 12px;
  text-align: center;
  padding: 28px;
  border-top: 1px solid var(--border);
  margin-top: 52px;
}

/* ===== About Page ===== */
.page-content {
  max-width: var(--content-w);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.85;
}
.page-content h1 {
  font-family: var(--font-heading);
  font-size: 40px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}
.page-content h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  margin: 40px 0 14px;
  color: #fff;
  font-size: 24px;
  letter-spacing: -0.3px;
}
.page-content p {
  margin-bottom: 22px;
  color: var(--ink-light);
}
.page-content ul {
  margin: 0 0 22px 28px;
}
.page-content li {
  margin-bottom: 8px;
  color: var(--ink-light);
}

/* ======================================================================
   ROUGE SYNTAX HIGHLIGHTING — Dark theme (Monokai-inspired)
   Rouge token classes: https://github.com/rouge-ruby/rouge/wiki/List-of-tokens
   ====================================================================== */
.highlight .hll {
  background: rgba(124, 199, 255, 0.08);
}
.highlight .c,
.highlight .ch,
.highlight .cd,
.highlight .cm,
.highlight .cpf,
.highlight .c1,
.highlight .cs {
  color: #6a737d;
  font-style: italic;
} /* Comments */

.highlight .k,
.highlight .kc,
.highlight .kd,
.highlight .kn,
.highlight .kp,
.highlight .kr,
.highlight .kv {
  color: #ff79c6;
} /* Keywords */
.highlight .kt {
  color: #8be9fd;
  font-style: italic;
} /* Keyword Type (int, float) */

.highlight .n {
  color: var(--ink-light);
} /* Name */
.highlight .na {
  color: #50fa7b;
} /* Name.Attribute */
.highlight .nb {
  color: #8be9fd;
} /* Name.Builtin */
.highlight .nc {
  color: #50fa7b;
} /* Name.Class */
.highlight .nd {
  color: #50fa7b;
} /* Name.Decorator */
.highlight .nf,
.highlight .fm {
  color: #50fa7b;
} /* Name.Function */
.highlight .ni {
  color: var(--ink);
} /* Name.Entity */
.highlight .nn {
  color: var(--ink-light);
} /* Name.Namespace */
.highlight .no {
  color: #bd93f9;
} /* Name.Constant */
.highlight .nt {
  color: #ff79c6;
} /* Name.Tag (HTML) */
.highlight .nv,
.highlight .vi,
.highlight .vg {
  color: #bd93f9;
} /* Variables */
.highlight .ne {
  color: #ff5555;
} /* Name.Exception */

.highlight .s,
.highlight .sa,
.highlight .sb,
.highlight .sc,
.highlight .sd,
.highlight .s2,
.highlight .se,
.highlight .sh,
.highlight .si,
.highlight .sx,
.highlight .sr,
.highlight .s1,
.highlight .ss {
  color: #f1fa8c;
} /* Strings */
.highlight .dl {
  color: #f1fa8c;
} /* String.Delimiter */

.highlight .m,
.highlight .mb,
.highlight .mf,
.highlight .mh,
.highlight .mi,
.highlight .mo,
.highlight .mx,
.highlight .il {
  color: #bd93f9;
} /* Numbers */

.highlight .o,
.highlight .ow {
  color: #ff79c6;
} /* Operators */
.highlight .p {
  color: var(--ink-light);
} /* Punctuation */

.highlight .gh {
  color: #f8f8f2;
  font-weight: 600;
} /* Generic.Heading */
.highlight .gu {
  color: #6a737d;
} /* Generic.Subheading */
.highlight .gi {
  color: #50fa7b;
} /* Generic.Inserted (diff) */
.highlight .gd {
  color: #ff5555;
} /* Generic.Deleted (diff) */
.highlight .ge {
  font-style: italic;
} /* Generic.Emph */
.highlight .gs {
  font-weight: 700;
} /* Generic.Strong */
.highlight .gl {
  text-decoration: underline;
} /* Generic.Lineno */

.highlight .w {
  color: var(--ink-light);
} /* Whitespace */
.highlight .err {
  color: #ff5555;
} /* Error */

/* ======================================================================
   RESPONSIVE
   ====================================================================== */
@media (max-width: 960px) {
  /* Sidenotes become inline toggleable footnotes */
  .sidenote-content {
    float: none;
    display: none;
    width: 100%;
    margin: 10px 0 18px;
    padding: 14px 18px;
    background: var(--card);
    border-radius: 8px;
    border: 1px solid var(--border);
  }
  .sidenote-toggle:checked + .sidenote-content {
    display: block;
  }
  .sidenote-label {
    cursor: pointer;
  }
}

@media (max-width: 600px) {
  .post-grid {
    grid-template-columns: 1fr;
  }
  .post-header h1 {
    font-size: 30px;
  }
  .post-content {
    font-size: 16.5px;
  }
  .post-content h2 {
    font-size: 24px;
    margin-top: 40px;
  }
  .post-content h3 {
    font-size: 20px;
  }
  .post-content blockquote {
    font-size: 17px;
  }
  .header-inner {
    flex-direction: column;
    gap: 10px;
  }
  body {
    font-size: 16px;
  }
}