/* DataParade articles, styled as the dataparade.io landing app: its live tokens (landing/app/globals.css), its navbar,
   footer, posts listing and post page (landing/components). Light by default; the landing switch adds .dark to <html>
   (web/hooks.py runs it before first paint and shares its localStorage key). Markup comes from web/hooks.py. */
:root {
  color-scheme: light;
  --font-heading: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;

  --color-canvas: #f7f7f2;
  --color-surface: #f7f7f2;
  --color-surface-raised: #ffffff;
  --color-surface-strong: #e8e0d2;
  --color-border: #e6dfd8;
  --color-border-subtle: #ebe6df;
  --color-text-primary: #141413;
  --color-text-secondary: #3d3d3a;
  --color-text-muted: #6c6a64;
  --color-brand: #0c7377;
  --color-brand-active: #085558;
  --color-on-primary: #ffffff;
  --color-brand-tint: rgba(12, 115, 119, 0.1);
  --color-brand-wash: rgba(12, 115, 119, 0.05);
  --color-eyebrow: #0c7377;
  --color-chip: var(--color-canvas);
  --color-code-block: #181715;
  --color-header: rgba(247, 247, 242, 0.8);
  --radius: 0.5rem;
  --shadow-lift: 0 10px 15px -3px rgba(20, 20, 19, 0.1), 0 4px 6px -4px rgba(20, 20, 19, 0.1);

  /* Papyrus component baseline (skip link, page actions) */
  --papyrus-bg: var(--color-surface-raised);
  --papyrus-ink: var(--color-text-primary);
  --papyrus-rule: var(--color-border);
  --papyrus-focus: var(--color-brand);
}

:root.dark {
  color-scheme: dark;
  --color-canvas: #181715;
  --color-surface: #1f1e1b;
  --color-surface-raised: #252320;
  --color-surface-strong: #252320;
  --color-border: rgba(250, 249, 245, 0.12);
  --color-border-subtle: rgba(250, 249, 245, 0.08);
  --color-text-primary: #faf9f5;
  --color-text-secondary: rgba(250, 249, 245, 0.78);
  --color-text-muted: #a09d96;
  --color-brand-tint: rgba(12, 115, 119, 0.2);
  --color-brand-wash: rgba(12, 115, 119, 0.1);
  --color-eyebrow: #6ec4c8;
  --color-chip: #1f1e1b;
  --color-code-block: #0d1117;
  --color-header: rgba(24, 23, 21, 0.8);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

:root.dark body { background: var(--color-canvas); }

main#main { flex: 1; padding: 7rem 1rem 6rem; }

a { color: inherit; text-decoration: none; }

:where(a, button, summary, input):focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
  border-radius: 0.25rem;
}

.dp-icon { width: 1rem; height: 1rem; flex: none; }
.dp-icon-small { width: 0.875rem; height: 0.875rem; }
.dp-when-dark, :root.dark .dp-when-light { display: none; }
:root.dark .dp-when-dark { display: block; }

.dp-eyebrow {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-eyebrow);
}
.dp-eyebrow.dp-muted { color: var(--color-text-muted); }

/* ------------------------------------------------------------------ buttons */

.dp-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 2.75rem;
  padding: 0 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}
.dp-button-primary { background: var(--color-brand); color: var(--color-on-primary); font-weight: 600; }
.dp-button-primary:hover { background: var(--color-brand-active); }
.dp-button-outline { border-color: var(--color-border); color: var(--color-text-primary); background: transparent; }
.dp-button-outline:hover { background: var(--color-surface); }
.dp-button-large { padding: 0 1.5rem; }

.dp-icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
}
.dp-icon-button:hover { background: var(--color-surface); }

/* ------------------------------------------------------------------ header (landing Navbar) */

.dp-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-header);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.dp-header-inner {
  position: relative;
  display: flex;
  align-items: center;
  height: 4rem;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1rem;
}

.dp-logo { display: inline-flex; align-items: center; flex: none; }
.dp-logo img { height: 2rem; width: auto; max-width: 17rem; }
.dp-logo-small img { height: 1.5rem; }
.dp-logo-dark, :root.dark .dp-logo-light { display: none; }
:root.dark .dp-logo-dark { display: block; }

.dp-nav {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: none;
  align-items: center;
  gap: 1rem;
  white-space: nowrap;
}
.dp-nav a, .dp-menu-links a { color: var(--color-text-secondary); transition: color 0.15s ease; }
.dp-nav a { font-size: 0.875rem; }
.dp-nav a:hover, .dp-nav a[aria-current="page"], .dp-menu-links a:hover, .dp-menu-links a[aria-current="page"] { color: var(--color-text-primary); }

.dp-header-actions { display: none; align-items: center; gap: 0.75rem; margin-left: auto; }

.dp-menu { margin-left: auto; }
.dp-menu > summary { list-style: none; }
.dp-menu > summary::-webkit-details-marker { display: none; }
.dp-menu-close, .dp-menu[open] .dp-menu-open { display: none; }
.dp-menu[open] .dp-menu-close { display: block; }

/* The header's backdrop-filter makes it the containing block of fixed children: hang the panel from its bottom edge. */
.dp-menu-panel {
  position: fixed;
  top: 100%;
  left: 0;
  right: 0;
  height: calc(100vh - 4rem);
  height: calc(100dvh - 4rem);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  background: var(--color-surface);
}
:root.dark .dp-menu-panel { background: var(--color-canvas); }
.dp-menu-links { display: flex; flex-direction: column; gap: 0.25rem; padding: 1.5rem; }
.dp-menu-links a { display: block; padding: 0.875rem 0; font-size: 1.25rem; color: var(--color-text-primary); }
.dp-menu-actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: auto;
  padding: 1.5rem 1.5rem max(2rem, env(safe-area-inset-bottom));
  border-top: 1px solid var(--color-border);
}
.dp-menu-actions .dp-button { height: 3rem; width: 100%; }

@media (min-width: 640px) {
  .dp-header-inner { padding: 0 1.5rem; }
  .dp-logo img { height: 2.25rem; }
  .dp-logo-small img { height: 1.5rem; }
  main#main { padding-left: 1.5rem; padding-right: 1.5rem; }
}

@media (min-width: 1024px) {
  .dp-header-inner { padding: 0 2rem; }
  main#main { padding-left: 2rem; padding-right: 2rem; }
}

/* The landing switches at 1024px, where its six centred links already touch the actions; switch a little later. */
@media (min-width: 1120px) {
  .dp-nav, .dp-header-actions { display: flex; }
  .dp-menu { display: none; }
}

@media (min-width: 1280px) {
  .dp-nav { gap: 2rem; }
  .dp-header-actions .dp-button { padding: 0 1.25rem; }
}

/* ------------------------------------------------------------------ posts listing (landing app/posts) */

.dp-listing { max-width: 80rem; margin: 0 auto; }
.dp-listing-header { max-width: 48rem; margin: 0 auto; text-align: center; }
.dp-listing-header .dp-eyebrow { margin-bottom: 0.75rem; }
.dp-listing-header h1, .markus-document > h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.dp-listing-header p:last-child { max-width: 42rem; margin: 1rem auto 0; font-size: 1.125rem; line-height: 1.625; color: var(--color-text-secondary); }

.dp-card-grid, .markus-card-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; margin-top: 4rem; }
.markus-document > .markus-card-grid { margin-top: 2.5rem; }
.dp-listing-more { margin: 3rem 0 0; text-align: center; }

@media (min-width: 640px) {
  .dp-listing-header h1, .markus-document > h1 { font-size: 3rem; }
}
@media (min-width: 768px) {
  .dp-card-grid, .markus-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .dp-card-grid, .markus-card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .dp-listing-header h1 { font-size: 3.75rem; }
}

/* ------------------------------------------------------------------ post card (landing PostCard) */

.dp-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-surface-raised);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
:root.dark .dp-card { border-color: var(--color-border-subtle); }
.dp-card:hover { transform: translateY(-0.25rem); border-color: rgba(12, 115, 119, 0.5); box-shadow: var(--shadow-lift); }
.dp-card:focus-within { border-color: var(--color-brand); }

.dp-card-meta { display: flex; align-items: center; gap: 0.25rem; margin: 0; font-size: 0.75rem; color: var(--color-text-muted); }
.dp-card-meta .dp-icon { opacity: 0.7; }

.dp-card-title {
  margin: 1rem 0 0;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.015em;
  transition: color 0.15s ease;
}
.dp-card:hover .dp-card-title { color: var(--color-brand); }
.dp-card-title a::after { content: ""; position: absolute; inset: 0; border-radius: 0.75rem; }
.dp-card-title a:focus-visible { outline: none; }

.dp-card-summary {
  margin: 0.75rem 0 0;
  font-size: 0.875rem;
  line-height: 1.625;
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.dp-card-tags { display: flex; flex-wrap: wrap; gap: 0.375rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.dp-card-tags li { padding: 0.125rem 0.5rem; border-radius: 0.375rem; background: var(--color-chip); font-size: 0.75rem; color: var(--color-text-muted); }

.dp-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.75rem;
}
.dp-card-tags + .dp-card-footer, .dp-card-summary + .dp-card-footer { margin-top: 1.5rem; }
:root.dark .dp-card-footer { border-top-color: var(--color-border-subtle); }
.dp-card-author { font-weight: 500; }
.dp-card-read { display: inline-flex; align-items: center; gap: 0.25rem; font-weight: 500; color: var(--color-brand); transition: transform 0.15s ease; }
.dp-card:hover .dp-card-read { transform: translateX(0.25rem); }
:root.dark .dp-card-read { color: var(--color-eyebrow); }

@media (min-width: 640px) {
  .dp-card-title { font-size: 1.5rem; }
}

/* ------------------------------------------------------------------ post page (landing app/posts/[slug] and PostContent) */

.dp-post { max-width: 48rem; margin: 0 auto; }

.dp-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.15s ease;
}
.dp-back:hover { color: var(--color-brand); }
.dp-back .dp-icon { transition: transform 0.15s ease; }
.dp-back:hover .dp-icon { transform: translateX(-0.25rem); }

.dp-post-header { padding-bottom: 2rem; border-bottom: 1px solid var(--color-border); }
:root.dark .dp-post-header { border-bottom-color: var(--color-border-subtle); }

.dp-post-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0 0 1rem; padding: 0; list-style: none; }
.dp-post-tags a, .markus-tags a {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  border-radius: 0.375rem;
  background: var(--color-brand-tint);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-brand);
}
:root.dark .dp-post-tags a, :root.dark .markus-tags a { color: var(--color-eyebrow); }

.dp-post-header h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.875rem;
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.025em;
}
.dp-post-description { margin: 1rem 0 0; font-size: 1.125rem; line-height: 1.625; color: var(--color-text-secondary); }

.dp-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.dp-post-author { font-weight: 500; color: var(--color-text-primary); }
.dp-post-dates { display: flex; gap: 1rem; font-size: 0.75rem; }
.dp-post-dates > span { display: inline-flex; align-items: center; gap: 0.375rem; }
.dp-post-dates .dp-icon { opacity: 0.7; }

.dp-post .markus-page-actions { margin: 1.5rem 0 0; font-size: 0.75rem; }
.dp-post .markus-page-actions :is(button, a) { background: transparent; color: var(--color-text-secondary); border-radius: var(--radius); }
.dp-post .markus-page-actions :is(button, a):hover { color: var(--color-text-primary); background: var(--color-surface-raised); }
.dp-post .markus-actions-links { display: flex; gap: 0.5rem; margin: 0; padding: 0; list-style: none; }

@media (min-width: 640px) {
  .dp-post-header h1 { font-size: 2.25rem; }
  .dp-post-dates { font-size: 0.875rem; }
}
@media (min-width: 1024px) {
  .dp-post-header h1 { font-size: 3rem; }
}

/* Article body (Markus fragment) */
.dp-prose { padding-top: 2rem; color: var(--color-text-secondary); }
.dp-prose :is(h2, h3, h4) { scroll-margin-top: 6rem; color: var(--color-text-primary); font-family: var(--font-heading); }
.dp-prose h2 { margin: 3rem 0 0; font-size: 1.5rem; font-weight: 400; line-height: 1.3; letter-spacing: -0.02em; }
.dp-prose h3 { margin: 2rem 0 0; font-size: 1.25rem; font-weight: 500; line-height: 1.35; letter-spacing: -0.015em; }
.dp-prose h4 { margin: 1.5rem 0 0; font-size: 1.125rem; font-weight: 500; }
.dp-prose :is(p, ul, ol) { margin: 1.25rem 0 0; font-size: 1rem; line-height: 1.625; }
.dp-prose :is(ul, ol) { padding-left: 1.5rem; }
.dp-prose ul { list-style: disc; }
.dp-prose ol { list-style: decimal; }
.dp-prose li { padding-left: 0.25rem; }
.dp-prose li + li { margin-top: 0.625rem; }
.dp-prose li > p { margin-top: 0.5rem; }
.dp-prose li > p:first-child { margin-top: 0; }
.dp-prose :is(strong, b) { font-weight: 600; color: var(--color-text-primary); }
.dp-prose a {
  color: var(--color-brand);
  text-decoration: underline;
  text-decoration-color: rgba(12, 115, 119, 0.3);
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}
.dp-prose a:hover { color: var(--color-brand-active); text-decoration-color: var(--color-brand-active); }
:root.dark .dp-prose a { color: var(--color-eyebrow); }
.dp-prose blockquote {
  margin: 1.5rem 0 0;
  padding: 0.75rem 1.25rem;
  border-left: 4px solid var(--color-brand);
  border-radius: 0 0.5rem 0.5rem 0;
  background: var(--color-brand-wash);
  font-style: italic;
}
.dp-prose blockquote > :first-child { margin-top: 0; }
.dp-prose hr { margin: 2.5rem 0; border: 0; border-top: 1px solid var(--color-border); }
.dp-prose :not(pre) > code {
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  background: var(--color-canvas);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-brand);
}
:root.dark .dp-prose :not(pre) > code { background: #1f1e1b; color: var(--color-eyebrow); }
.dp-prose pre {
  margin: 1.5rem 0 0;
  padding: 1rem;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-code-block);
  box-shadow: 0 4px 6px -1px rgba(20, 20, 19, 0.1), 0 2px 4px -2px rgba(20, 20, 19, 0.1);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.625;
  color: #e6edf3;
}
.dp-prose pre code { font: inherit; color: inherit; }
.dp-prose img { max-width: 100%; height: auto; border-radius: 0.75rem; }
.dp-prose figure { margin: 1.5rem 0 0; }
.dp-prose figcaption { margin-top: 0.5rem; font-size: 0.875rem; color: var(--color-text-muted); }
.dp-prose table { width: 100%; margin: 1.5rem 0 0; border-collapse: collapse; font-size: 0.875rem; display: block; overflow-x: auto; }
.dp-prose :is(th, td) { padding: 0.625rem 0.75rem; border-bottom: 1px solid var(--color-border); text-align: left; vertical-align: top; }
.dp-prose th { font-weight: 600; color: var(--color-text-primary); background: var(--color-surface-raised); }

@media (min-width: 640px) {
  .dp-prose h2 { font-size: 1.875rem; }
  .dp-prose h3 { font-size: 1.5rem; }
  .dp-prose :is(p, ul, ol) { font-size: 1.125rem; line-height: 2rem; }
}

/* Call to action under a post */
.dp-cta {
  margin-top: 4rem;
  padding: 2rem;
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  background: var(--color-surface-raised);
  text-align: center;
}
:root.dark .dp-cta { border-color: var(--color-border-subtle); }
.dp-cta h2 { margin: 0; font-family: var(--font-heading); font-size: 1.5rem; font-weight: 400; line-height: 1.3; }
.dp-cta p { max-width: 36rem; margin: 0.75rem auto 0; color: var(--color-text-secondary); }
.dp-cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; margin-top: 1.5rem; }

@media (min-width: 640px) {
  .dp-cta { padding: 2.5rem; }
  .dp-cta h2 { font-size: 1.875rem; }
}

/* ------------------------------------------------------------------ Papyrus pages without a hook (tags, archive, 404) */

.markus-document { max-width: 80rem; margin: 0 auto; }
.markus-document > p { color: var(--color-text-secondary); }
.markus-document a:not(.dp-card a) { color: var(--color-brand); }
.markus-tag-cloud { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 2rem 0 0; padding: 0; list-style: none; color: var(--color-text-muted); }
.markus-pager { display: flex; justify-content: space-between; align-items: center; margin: 3rem 0 0; font-size: 0.875rem; color: var(--color-text-muted); }
.markus-pager a { color: var(--color-brand); font-weight: 500; }

/* ------------------------------------------------------------------ footer (landing Footer) */

.markus-site-footer {
  background: var(--color-surface);
  color: var(--color-text-secondary);
}
:root.dark .markus-site-footer { border-top: 1px solid var(--color-border); }

.dp-footer-inner { max-width: 80rem; margin: 0 auto; padding: 0 1rem; }
.dp-footer-main { display: flex; flex-direction: column; gap: 2.5rem; padding: 3rem 0; }
.dp-footer-brand { max-width: 20rem; }
.dp-footer-brand p { margin: 0.75rem 0 0; font-size: 0.875rem; line-height: 1.625; }
.dp-footer-columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
.dp-footer-column ul { margin: 1rem 0 0; padding: 0; list-style: none; }
.dp-footer-column li + li { margin-top: 0.625rem; }
.dp-footer-column a { font-size: 0.875rem; transition: color 0.15s ease; }
.dp-footer-column a:hover { color: var(--color-text-primary); }
.dp-footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.dp-footer-bottom p { margin: 0; }
.dp-footer-motto { opacity: 0.6; }

@media (min-width: 640px) {
  .dp-footer-inner { padding: 0 1.5rem; }
  .dp-footer-main { padding: 3.5rem 0; }
  .dp-footer-columns { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .dp-footer-bottom { flex-direction: row; align-items: center; justify-content: space-between; }
}
@media (min-width: 1024px) {
  .dp-footer-inner { padding: 0 2rem; }
  .dp-footer-main { flex-direction: row; align-items: flex-start; justify-content: space-between; }
  .dp-footer-columns { gap: 3rem; }
}

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