:root {
  --canvas: oklch(0.165 0.018 255);
  --canvas-2: oklch(0.145 0.018 255);
  --surface: oklch(0.205 0.022 255);
  --hairline: oklch(0.33 0.02 255);
  --ink: oklch(0.965 0.004 255);
  --ink-muted: oklch(0.755 0.014 255);
  --ink-faint: oklch(0.585 0.016 255);
  --cyan: oklch(0.82 0.13 200);
  --blue: oklch(0.71 0.13 255);
  --on-accent: oklch(0.17 0.03 255);
  --display: 'Bricolage Grotesque', system-ui, sans-serif;
  --body: 'Hanken Grotesk', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --maxw-narrow: 760px;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.wrap { width: 100%; max-width: var(--maxw-narrow); margin: 0 auto; padding: 0 1.25rem; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; border-radius: 3px; }

/* nav */
.blog-nav { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--hairline);
  background: color-mix(in oklch, var(--canvas) 86%, transparent); backdrop-filter: blur(8px); }
.blog-nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.blog-wordmark { font-family: var(--display); font-weight: 700; color: var(--ink); font-size: 1.1rem; letter-spacing: -0.01em; }
.blog-wordmark span { color: var(--cyan); }
.blog-nav-links { display: flex; align-items: center; gap: 1.25rem; font-size: 0.95rem; }
.blog-nav-links > a:first-child { color: var(--ink-muted); }
.blog-cta { background: var(--cyan); color: var(--on-accent); padding: 0.5rem 0.95rem; border-radius: var(--radius); font-weight: 600; }
.blog-cta:hover { text-decoration: none; filter: brightness(1.06); }

/* post */
.blog-post { padding: 2.5rem 0 4rem; }
.breadcrumb { font-size: 0.85rem; color: var(--ink-faint); margin-bottom: 1.5rem; }
.breadcrumb a { color: var(--ink-muted); }
.post-head h1 { font-family: var(--display); font-weight: 800; letter-spacing: -0.02em;
  font-size: clamp(2rem, 1.4rem + 2.6vw, 3rem); line-height: 1.1; margin: 0 0 0.75rem; }
.post-meta { color: var(--ink-faint); font-size: 0.9rem; margin: 0 0 2.5rem; }
.post-body h2 { font-family: var(--display); font-weight: 700; letter-spacing: -0.01em; font-size: 1.6rem; margin: 2.75rem 0 1rem; scroll-margin-top: 80px; }
.post-body h3 { font-family: var(--display); font-weight: 600; font-size: 1.25rem; margin: 2rem 0 0.75rem; scroll-margin-top: 80px; }

/* post layout: single column by default; sticky ToC rail on wide screens */
.post-toc-rail { display: none; }

@media (min-width: 1040px) {
  .blog-post .wrap { max-width: 1060px; }
  .post-layout.has-toc { display: grid; grid-template-columns: minmax(0, 1fr) 230px; gap: 3.5rem; align-items: start; }
  /* Pin both to row 1 so the rail (first in DOM) doesn't push the article to row 2. */
  .post-layout.has-toc .post-main { grid-column: 1; grid-row: 1; min-width: 0; }
  .post-layout.has-toc .post-toc-rail {
    grid-column: 2; grid-row: 1; display: block;
    position: sticky; top: 84px;
    max-height: calc(100vh - 108px); overflow-y: auto;
  }
  .post-layout.has-toc .post-toc-rail .toc { margin: 0; }
  .post-layout.has-toc .post-toc-inline { display: none; }
}

/* table of contents */
.toc { background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 1.25rem 1.5rem; margin: 0 0 2.25rem; }
.toc-title { font-family: var(--display); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); margin: 0 0 0.75rem; }
.toc > ol { counter-reset: toc; list-style: none; margin: 0; padding: 0; }
.toc > ol > li { counter-increment: toc; margin: 0.4rem 0; }
.toc > ol > li::before { content: counter(toc) ". "; color: var(--ink-faint); font-variant-numeric: tabular-nums; }
.toc a { color: var(--ink-muted); text-decoration: none; }
.toc a:hover { color: var(--cyan); text-decoration: underline; }
.toc-sub { list-style: none; margin: 0.3rem 0 0.5rem; padding-left: 1.4rem; }
.toc-sub li { margin: 0.25rem 0; }
.toc-sub a { font-size: 0.95em; color: var(--ink-faint); }
.post-body p, .post-body li { color: var(--ink-muted); }
.post-body p { margin: 0 0 1.25rem; }
.post-body ul, .post-body ol { margin: 0 0 1.5rem; padding-left: 1.25rem; }
.post-body li { margin: 0.4rem 0; }
.post-body strong { color: var(--ink); font-weight: 600; }
.post-body a { text-decoration: underline; text-underline-offset: 2px; }
.post-body blockquote { border-left: 3px solid var(--cyan); margin: 1.5rem 0; padding: 0.25rem 0 0.25rem 1.25rem; color: var(--ink); font-style: italic; }
.post-body code { font-family: var(--mono); font-size: 0.85em; background: var(--surface); padding: 0.15em 0.4em; border-radius: 6px; }
.post-body pre { background: var(--canvas-2); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 1rem 1.25rem; overflow-x: auto; margin: 0 0 1.5rem; }
.post-body pre code { background: none; padding: 0; }
.post-body img { max-width: 100%; height: auto; border-radius: var(--radius); }
.post-body table { width: 100%; border-collapse: collapse; margin: 0 0 1.5rem; display: block; overflow-x: auto; }
.post-body th, .post-body td { border: 1px solid var(--hairline); padding: 0.6rem 0.8rem; text-align: left; }
.post-body th { color: var(--ink); font-family: var(--display); font-weight: 600; }

/* TL;DR box: author with <div class="tldr">…</div> in markdown */
.post-body .tldr { background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 1.25rem 1.5rem; margin: 0 0 2rem; }
.post-body .tldr :last-child { margin-bottom: 0; }
.post-body .tldr strong { color: var(--cyan); }

/* faq */
.faq { margin: 3rem 0 0; border-top: 1px solid var(--hairline); padding-top: 2rem; }
.faq h2 { font-family: var(--display); font-size: 1.6rem; margin: 0 0 1.5rem; }
.faq-item { margin: 0 0 1.5rem; }
.faq-item h3 { font-family: var(--display); font-weight: 600; font-size: 1.1rem; margin: 0 0 0.4rem; color: var(--ink); }
.faq-item p { color: var(--ink-muted); margin: 0; }

/* cta */
.post-cta { margin: 3rem 0 0; text-align: center; background: linear-gradient(180deg, var(--surface), var(--canvas-2));
  border: 1px solid var(--hairline); border-radius: var(--radius); padding: 2rem; }
.post-cta h2 { font-family: var(--display); font-size: 1.5rem; margin: 0 0 0.75rem; }
.post-cta p { color: var(--ink-muted); margin: 0 auto 1.5rem; max-width: 48ch; }

/* index */
.blog-index { padding: 3rem 0 4rem; }
.index-head { margin-bottom: 2.5rem; }
.index-head h1 { font-family: var(--display); font-weight: 800; letter-spacing: -0.02em;
  font-size: clamp(2.2rem, 1.5rem + 3vw, 3.4rem); margin: 0 0 0.75rem; }
.index-head p { color: var(--ink-muted); font-size: 1.15rem; max-width: 55ch; }
.post-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }
.post-card a { display: block; background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 1.5rem; color: inherit; }
.post-card a:hover { text-decoration: none; border-color: var(--cyan); }
.post-card h2, .post-card h3 { font-family: var(--display); font-weight: 700; font-size: 1.35rem; margin: 0 0 0.5rem; color: var(--ink); }
.post-card p { color: var(--ink-muted); margin: 0 0 0.75rem; }
.post-card-meta { color: var(--ink-faint); font-size: 0.85rem; }

/* categories */
.blog-category { padding: 2.5rem 0 4rem; }
.cat-badge { display: inline-block; font-family: var(--display); font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--cyan); background: color-mix(in oklch, var(--cyan) 12%, transparent); border: 1px solid var(--hairline); border-radius: 999px; padding: 0.25rem 0.7rem; margin: 0 0 0.9rem; text-decoration: none; }
.cat-badge:hover { text-decoration: none; border-color: var(--cyan); }
.blog-cat-nav { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0 0 2.75rem; }
.blog-cat-nav a { font-size: 0.9rem; color: var(--ink-muted); background: var(--surface); border: 1px solid var(--hairline); border-radius: 999px; padding: 0.4rem 0.9rem; text-decoration: none; }
.blog-cat-nav a:hover { border-color: var(--cyan); color: var(--ink); text-decoration: none; }
.blog-cat-nav a.active { background: var(--cyan); color: var(--on-accent); border-color: var(--cyan); }
.cat-group { margin: 0 0 2.75rem; }
.cat-group > h2 { font-family: var(--display); font-weight: 700; font-size: 1.5rem; margin: 0 0 1.1rem; letter-spacing: -0.01em; }
.cat-group > h2 a { color: var(--ink); text-decoration: none; }
.cat-group > h2 a:hover { color: var(--cyan); }
.cat-more { display: inline-block; margin-top: 1rem; font-family: var(--display); font-weight: 600; font-size: 0.95rem; color: var(--cyan); text-decoration: none; }
.cat-more:hover { text-decoration: underline; }

/* footer */
.blog-footer { border-top: 1px solid var(--hairline); padding: 2.5rem 0; text-align: center; color: var(--ink-faint); font-size: 0.9rem; }
.blog-footer a { color: var(--ink-muted); }
.blog-footer p { margin: 0.35rem 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}