/* ============================================================================
   Munder Difflin Blog — design system
   Warm-paper neo-brutalist, native extension of munderdiffl.in.
   Tokens mirror docs/DESIGN.md (the marketing-site source of truth).
   ========================================================================= */

:root {
  /* canvas & surfaces — warm paper */
  --paper:    #FFFDF7;
  --cream:    #F5F2E8;
  --cream-2:  #F5ECD7;
  --white:    #FFFFFF;
  --ink-band: #1B1B1B;

  /* ink (text + borders share the same near-black) */
  --ink:       #1B1B1B;
  --ink-dim:   #57544C;
  --ink-faint: #8A867A;

  /* accents */
  --yellow:      #FFCA54;
  --sky:         #72C2DF;
  --maroon:      #B23A4E;
  --maroon-deep: #6E1423;

  /* pastel cluster tints */
  --lilac:    #E4DEFB;
  --peach:    #FBDDBE;
  --mint:     #D6F3E1;
  --tan:      #F1E6CC;
  --rose:     #FBE0DF;
  --sky-soft: #DCEFF7;

  /* neo-brutalist depth — hard offset shadows, no blur */
  --shadow-card:    10px 10px 0 var(--ink);
  --shadow-card-sm:  6px 6px 0 var(--ink);
  --shadow-btn:      4px 4px 0 var(--ink);
  --shadow-chip:     3px 3px 0 var(--ink);

  /* geometry */
  --border:      2px solid var(--ink);
  --border-bold: 3px solid var(--ink);
  --hair:        1px solid rgba(27, 27, 27, 0.16);

  /* layout */
  --maxw: 1200px;
  --measure: 70ch;          /* readable post column */
  --pad-x: 24px;

  --font-sans: "Geist", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--paper);
  color: var(--ink-dim);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* dotted paper grid, radially masked */
  background-image: radial-gradient(var(--ink-faint) 1px, transparent 1px);
  background-size: 22px 22px;
  background-attachment: fixed;
}
body::before {
  /* fade the dots so they sit behind content, not over it */
  content: "";
  position: fixed; inset: 0; z-index: -1;
  background: var(--paper);
  -webkit-mask-image: radial-gradient(circle at 50% 0%, transparent 0%, #000 70%);
  mask-image: radial-gradient(circle at 50% 0%, transparent 0%, #000 70%);
}
a { color: var(--ink); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--maroon); }
img, svg, video { max-width: 100%; display: block; }
code, .mono { font-family: var(--font-mono); }
::selection { background: var(--yellow); color: var(--ink); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad-x); }
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--white);
  padding: 10px 16px; font-family: var(--font-mono); font-size: 13px; z-index: 200;
}
.skip-link:focus { left: 8px; top: 8px; color: var(--white); }

/* ---------- nav (matches marketing site) ---------- */
nav {
  position: sticky; top: 0; z-index: 80;
  display: flex; align-items: center; gap: 18px;
  padding: 14px var(--pad-x);
  background: var(--paper);
  border-bottom: 2px solid transparent;
  transition: border-color .2s ease;
}
nav.scrolled { border-bottom-color: var(--ink); }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 30px; height: 30px; display: grid; place-items: center;
  background: var(--maroon); color: var(--white);
  font-family: var(--font-mono); font-weight: 700; font-size: 13px;
  border: var(--border); box-shadow: var(--shadow-chip);
}
.brand-word {
  font-family: var(--font-mono); font-weight: 700; font-size: 13px;
  letter-spacing: .02em; color: var(--ink);
}
.brand-word .sep { color: var(--ink-faint); margin: 0 6px; }
.brand-word .blog { color: var(--maroon); }
nav .spacer { flex: 1; }
nav .links { display: flex; gap: 24px; font-size: 14px; font-family: var(--font-mono); }
nav .links a { color: var(--ink-dim); font-weight: 500; }
nav .links a:hover, nav .links a[aria-current="page"] { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
@media (max-width: 760px) { nav .links { display: none; } }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-weight: 700; font-size: 14px; line-height: 1;
  padding: 12px 18px; cursor: pointer;
  border: var(--border); background: var(--white); color: var(--ink);
  box-shadow: var(--shadow-btn);
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
  white-space: nowrap;
}
.btn:hover { transform: translate(-2px,-2px); box-shadow: 6px 6px 0 var(--ink); color: var(--ink); }
.btn:active { transform: translate(2px,2px); box-shadow: 2px 2px 0 var(--ink); }
.btn.primary { background: var(--yellow); }
.btn.sm { padding: 9px 13px; font-size: 13px; box-shadow: var(--shadow-chip); }
.btn.sm:hover { box-shadow: var(--shadow-btn); }

/* ---------- eyebrow / labels ---------- */
.eyebrow {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: .28em; text-transform: uppercase; color: var(--ink-faint);
}
.eyebrow::before { content: "— "; }
.numlabel {
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  letter-spacing: .12em; color: var(--ink-faint);
}

/* ---------- page header ---------- */
.page-head { padding: 64px 0 28px; }
.page-head h1 {
  font-family: var(--font-mono); font-weight: 600;
  font-size: clamp(30px, 5vw, 50px); line-height: 1.04; letter-spacing: -.03em;
  color: var(--ink); margin: 14px 0 0;
}
.page-head .lead {
  margin-top: 16px; max-width: 60ch;
  font-size: clamp(16px, 2vw, 19px); color: var(--ink-dim);
}
.page-head .hl { color: var(--sky); }

/* ---------- filter bar (clusters) ---------- */
.filters {
  display: flex; flex-wrap: wrap; gap: 10px;
  padding: 22px 0 4px;
}
.chip {
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 500;
  letter-spacing: .02em; padding: 7px 12px;
  border: var(--border); background: var(--white); color: var(--ink);
  box-shadow: var(--shadow-chip); cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.chip:hover { transform: translate(-2px,-2px); box-shadow: var(--shadow-btn); color: var(--ink); }
.chip[aria-current="page"], .chip.active { background: var(--yellow); }
.chip .ct { color: var(--ink-faint); margin-left: 6px; }
.chip[aria-current="page"] .ct { color: var(--maroon-deep); }

/* tag pill (metadata style — dark) */
.tag {
  display: inline-block;
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 4px 9px; background: var(--ink); color: var(--white);
}
.tag:hover { color: var(--white); background: var(--maroon); }
.tag.kind { background: var(--maroon); }

/* ---------- post grid + cards ---------- */
.post-grid {
  display: grid; gap: 26px;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  padding: 30px 0 12px;
}
.card {
  display: flex; flex-direction: column;
  background: var(--white); border: var(--border-bold);
  box-shadow: var(--shadow-card-sm);
  transition: transform .14s ease, box-shadow .14s ease;
  height: 100%;
}
.card:hover { transform: translate(-3px,-3px); box-shadow: var(--shadow-card); }
.card .thumb {
  border-bottom: var(--border-bold); aspect-ratio: 16 / 9;
  display: grid; place-items: center; overflow: hidden;
  font-family: var(--font-mono); font-weight: 700; color: var(--ink);
}
.card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.card .body { padding: 22px 24px 24px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.card .meta {
  font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint);
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
}
.card .meta .dot { width: 4px; height: 4px; background: var(--ink-faint); border-radius: 50%; }
.card h3 {
  font-family: var(--font-mono); font-weight: 600; font-size: 20px;
  line-height: 1.18; letter-spacing: -.01em; color: var(--ink);
}
.card h3 a { color: inherit; }
.card h3 a:hover { color: var(--maroon); }
.card .dek { font-size: 14.5px; color: var(--ink-dim); }
.card .foot {
  margin-top: auto; display: flex; gap: 8px; flex-wrap: wrap; align-items: center;
  padding-top: 6px;
}
.card .more {
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 700; color: var(--ink);
}
.card .more:hover { color: var(--maroon); }

/* featured (first card spans full width on wide screens) */
.featured .card { flex-direction: row; }
.featured .card .thumb { aspect-ratio: auto; border-bottom: 0; border-right: var(--border-bold); width: 46%; min-width: 280px; }
.featured .card .body { padding: 30px 32px; gap: 14px; justify-content: center; }
.featured .card h3 { font-size: clamp(22px, 2.6vw, 30px); }
.featured .card .dek { font-size: 15.5px; }
@media (max-width: 760px) {
  .featured .card { flex-direction: column; }
  .featured .card .thumb { width: 100%; border-right: 0; border-bottom: var(--border-bold); aspect-ratio: 16/9; }
}

/* cluster-tint thumbnails (one tint per category cluster) */
.t-guides { background: var(--sky-soft); }
.t-orchestration { background: var(--peach); }
.t-memory { background: var(--lilac); }
.t-internals { background: var(--tan); }
.t-concepts { background: var(--mint); }
.t-comparisons { background: var(--rose); }
.t-use-cases { background: var(--sky-soft); }
.t-story { background: var(--peach); }
.t-default { background: var(--tan); }

/* ---------- post article ---------- */
.post-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 48px; align-items: start; padding: 8px 0 40px; }
@media (max-width: 980px) { .post-wrap { grid-template-columns: 1fr; } .toc-rail { display: none; } }

.post-head { padding: 48px 0 8px; }
.post-head .crumbs {
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint);
  display: flex; gap: 8px; flex-wrap: wrap; align-items: center;
}
.post-head .crumbs a { color: var(--ink-dim); }
.post-head .crumbs a:hover { color: var(--maroon); }
.post-head h1 {
  font-family: var(--font-mono); font-weight: 600;
  font-size: clamp(28px, 4.6vw, 46px); line-height: 1.06; letter-spacing: -.03em;
  color: var(--ink); margin: 16px 0 0; max-width: 22ch;
}
.post-head .dek { margin-top: 16px; font-size: clamp(16px, 2vw, 19px); color: var(--ink-dim); max-width: 60ch; }
.post-head .byline {
  margin-top: 22px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint);
}
.post-head .byline .av {
  width: 26px; height: 26px; display: grid; place-items: center;
  background: var(--maroon); color: var(--white); font-weight: 700; font-size: 11px;
  border: var(--border);
}
.post-head .byline strong { color: var(--ink); font-weight: 600; }

/* the readable prose column */
.prose { max-width: var(--measure); font-size: 16.5px; color: #2a2820; line-height: 1.72; }
.prose > * + * { margin-top: 1.15em; }
.prose h2 {
  font-family: var(--font-mono); font-weight: 600; font-size: 26px; letter-spacing: -.02em;
  color: var(--ink); margin-top: 2em; line-height: 1.18; scroll-margin-top: 84px;
}
.prose h3 {
  font-family: var(--font-mono); font-weight: 600; font-size: 19px; letter-spacing: -.01em;
  color: var(--ink); margin-top: 1.6em; scroll-margin-top: 84px;
}
.prose h2 .anchor, .prose h3 .anchor { color: var(--ink-faint); margin-left: 8px; opacity: 0; font-weight: 400; }
.prose h2:hover .anchor, .prose h3:hover .anchor { opacity: 1; }
.prose p, .prose li { color: #2a2820; }
.prose a { color: var(--maroon); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
.prose a:hover { background: var(--yellow); color: var(--ink); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: .4em; }
.prose img { border: var(--border-bold); box-shadow: var(--shadow-card-sm); }
.prose hr { border: 0; border-top: 2px solid rgba(27,27,27,.14); margin: 2.2em 0; }
.prose blockquote {
  border-left: 4px solid var(--maroon); padding: 4px 0 4px 20px;
  color: var(--ink-dim); font-style: italic;
}

/* inline + block code */
.prose :not(pre) > code {
  font-family: var(--font-mono); font-size: .88em;
  background: var(--cream-2); border: 1px solid rgba(27,27,27,.18);
  padding: 1px 6px; color: var(--maroon-deep);
}
.prose pre {
  font-family: var(--font-mono); font-size: 13.5px; line-height: 1.6;
  background: var(--ink-band); color: #e9e6dd;
  border: var(--border); box-shadow: var(--shadow-card-sm);
  padding: 18px 20px; overflow-x: auto; margin-top: 1.3em;
}
.prose pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }
/* prism token colors mapped to brand */
.prose .token.comment, .prose .token.prolog, .prose .token.doctype { color: #8c8778; }
.prose .token.punctuation { color: #c9c4b6; }
.prose .token.string, .prose .token.attr-value { color: #b9e29a; }
.prose .token.keyword, .prose .token.tag, .prose .token.selector { color: var(--sky); }
.prose .token.function, .prose .token.class-name { color: var(--yellow); }
.prose .token.number, .prose .token.boolean { color: #f0a9b6; }
.prose .token.operator, .prose .token.attr-name { color: #d8d3c6; }

/* callouts */
.callout {
  border: var(--border); box-shadow: var(--shadow-card-sm);
  padding: 16px 18px; display: flex; gap: 12px; margin-top: 1.3em;
  background: var(--sky-soft);
}
.callout .ic { font-family: var(--font-mono); font-weight: 700; }
.callout.note { background: var(--sky-soft); }
.callout.tip { background: var(--mint); }
.callout.warn { background: var(--peach); }
.callout p { margin: 0; color: #2a2820; }
.callout.tldr { background: var(--cream-2); box-shadow: var(--shadow-card-sm); }
.callout.tldr .ic { color: var(--maroon); }
.callout.tldr strong { color: var(--ink); }

/* comparison / feature tables (used heavily by the comparison cluster).
   GitHub-style block+scroll so wide tables stay readable on mobile while the
   columns keep aligning; neo-brutalist frame to match the rest of the system. */
.prose table {
  display: block;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  border: var(--border-bold);
  box-shadow: var(--shadow-card-sm);
  margin: 1.6em 0;
  font-size: 14.5px;
  line-height: 1.5;
}
.prose thead { background: var(--cream-2); }
.prose th, .prose td {
  border: var(--hair);
  padding: 9px 13px;
  text-align: left;
  vertical-align: top;
}
.prose th {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
  border-bottom: var(--border);
  white-space: nowrap;
}
.prose tbody td:first-child { font-weight: 600; color: var(--ink); }
.prose tbody tr:nth-child(even) { background: rgba(27, 27, 27, 0.035); }
.prose table a:hover { background: var(--yellow); }

/* in-post FAQ block (visible Q&A backing the FAQPage JSON-LD) */
.faq { margin-top: 2em; }
.faq h2 { margin-top: 0; }
.faq .qa { border-top: 2px solid rgba(27,27,27,.14); padding: 16px 0; }
.faq .q { font-family: var(--font-mono); font-weight: 600; color: var(--ink); font-size: 16px; }
.faq .a { margin-top: 6px; color: #2a2820; }

/* ---------- TOC rail ---------- */
.toc-rail { position: sticky; top: 84px; }
.toc-rail .tt {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .22em;
  text-transform: uppercase; color: var(--ink-faint); margin-bottom: 12px;
}
.toc-rail ol { list-style: none; padding: 0; border-left: 2px solid rgba(27,27,27,.14); }
.toc-rail li a {
  display: block; padding: 5px 0 5px 14px; margin-left: -2px;
  font-size: 13px; color: var(--ink-dim); border-left: 2px solid transparent;
}
.toc-rail li a:hover { color: var(--ink); border-left-color: var(--ink); }
.toc-rail li.lvl-3 a { padding-left: 26px; font-size: 12.5px; }

/* ---------- prev / next + related ---------- */
.post-foot { max-width: var(--measure); margin-top: 40px; }
.prevnext { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
@media (max-width: 600px) { .prevnext { grid-template-columns: 1fr; } }
.pn {
  border: var(--border); box-shadow: var(--shadow-chip); padding: 16px 18px; background: var(--white);
  transition: transform .12s ease, box-shadow .12s ease;
}
.pn:hover { transform: translate(-2px,-2px); box-shadow: var(--shadow-btn); }
.pn .k { font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-faint); }
.pn .t { display: block; margin-top: 6px; font-family: var(--font-mono); font-weight: 600; color: var(--ink); font-size: 14.5px; }
.pn.next { text-align: right; }

.related { margin-top: 48px; }
.related h2 { font-family: var(--font-mono); font-weight: 600; font-size: 22px; color: var(--ink); letter-spacing: -.02em; }
.share { display: flex; gap: 10px; align-items: center; margin-top: 26px; flex-wrap: wrap; }
.share .lbl { font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); letter-spacing: .1em; text-transform: uppercase; }

/* ---------- pagination ---------- */
.pager { display: flex; gap: 12px; align-items: center; justify-content: center; padding: 30px 0 8px; font-family: var(--font-mono); font-size: 13px; }
.pager .pg { padding: 8px 13px; border: var(--border); box-shadow: var(--shadow-chip); background: var(--white); color: var(--ink); }
.pager .pg.cur { background: var(--yellow); }
.pager .pg[aria-disabled="true"] { opacity: .4; pointer-events: none; }

/* ---------- footer (matches marketing site) ---------- */
footer { border-top: 2px solid var(--ink); background: var(--cream); margin-top: 60px; }
.foot-top { display: flex; flex-wrap: wrap; gap: 28px; justify-content: space-between; padding: 40px 0 24px; }
.foot-brand { display: flex; align-items: center; gap: 10px; }
.foot-links { display: flex; gap: 26px; flex-wrap: wrap; font-family: var(--font-mono); font-size: 13px; }
.foot-links a { color: var(--ink-dim); }
.foot-links a:hover { color: var(--ink); }
.foot-meta { padding: 0 0 36px; font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); }
.foot-meta a { color: var(--ink-dim); }

/* ---------- 404 / empty ---------- */
.center-stage { min-height: 52vh; display: grid; place-items: center; text-align: center; padding: 60px 0; }
.center-stage h1 { font-family: var(--font-mono); font-weight: 600; font-size: clamp(40px, 9vw, 96px); color: var(--ink); letter-spacing: -.04em; }
.center-stage p { margin-top: 14px; color: var(--ink-dim); }
.center-stage .btn { margin-top: 26px; }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .card, .btn, .chip, .pn { transition: none !important; }
  .card:hover, .btn:hover, .chip:hover, .pn:hover { transform: none !important; }
}