/*
 * Shared stylesheet for every blog. Sites differ through:
 *   - data-theme="editorial|modern|minimal" on <html> (layout + typography preset)
 *   - --color-* and --font-* custom properties set from site.config.ts
 *   - an optional design/ folder with the site's own header, footer and homepage
 */

:root {
  --color-primary: #1d4ed8;
  --color-ink: var(--color-primary);
  --color-on-primary: #fff;
  --color-accent: var(--color-primary);
  --color-bg: #ffffff;
  --color-surface: #f6f7f9;
  --color-text: #1f2328;
  --color-muted: #5b636e;
  --color-border: color-mix(in srgb, var(--color-text) 12%, transparent);

  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-heading: var(--font-body);
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 10px;
  --width: 72rem;
  --measure: 42rem;
}

[data-theme='editorial'] {
  --font-heading: 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --font-body: Charter, 'Bitstream Charter', 'Sitka Text', Cambria, Georgia, serif;
  --radius: 2px;
}

[data-theme='minimal'] {
  --radius: 0;
  --width: 48rem;
  --measure: 40rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  padding-block: 2.5rem 4rem;
}

/*
 * A site's own design (src/sites/<niche>/<domain>/design/) is drawn on a blank
 * page and styles itself, so the element rules below skip anything inside .design.
 */
main.design {
  padding-block: 0;
}

:is(h1, h2, h3, h4):where(:not(.design *)) {
  font-family: var(--font-heading);
  line-height: 1.25;
  margin: 1.8em 0 0.6em;
}

h1:where(:not(.design *)) {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-top: 0;
}

a:where(:not(.design *)) {
  color: var(--color-primary);
  text-underline-offset: 0.15em;
}

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

.container {
  width: 100%;
  max-width: var(--width);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.skip-link {
  position: absolute;
  left: -999px;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--color-bg);
  padding: 0.5rem 1rem;
  z-index: 10;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

[data-theme='modern'] .site-header {
  background: var(--color-primary);
  border: 0;
}

[data-theme='modern'] .site-header a {
  color: #fff;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-block: 1rem;
}

[data-theme='editorial'] .header-inner {
  flex-direction: column;
  padding-block: 1.75rem 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
}

[data-theme='editorial'] .brand {
  font-size: 2rem;
}

.brand-logo {
  width: auto;
  height: 36px;
}

.nav-list,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  text-decoration: none;
  font-weight: 500;
}

.nav-list a[aria-current='page'] {
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-block: 2rem;
}

.footer-inner p {
  margin: 0;
}

/* Home hero */
.hero {
  padding-block: 1rem 2rem;
  max-width: var(--measure);
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-muted);
}

[data-theme='editorial'] .hero {
  text-align: center;
  margin-inline: auto;
}

/* Post lists */
.post-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
}

[data-theme='minimal'] .post-grid,
[data-theme='editorial'] .post-grid {
  grid-template-columns: 1fr;
  max-width: var(--measure);
}

[data-theme='editorial'] .post-grid,
[data-theme='editorial'] .section-heading {
  max-width: var(--measure);
  margin-inline: auto;
}

.post-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

[data-theme='minimal'] .post-card,
[data-theme='editorial'] .post-card {
  background: none;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.25rem;
}

.post-card-image img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

[data-theme='minimal'] .post-card-image {
  display: none;
}

.post-card-body {
  padding: 1.25rem;
}

[data-theme='minimal'] .post-card-body,
[data-theme='editorial'] .post-card-body {
  padding: 0.75rem 0 0;
}

.post-card-title {
  margin: 0 0 0.25rem;
  font-size: 1.3rem;
}

.post-card-title a {
  color: var(--color-text);
  text-decoration: none;
}

.post-card-title a:hover {
  color: var(--color-primary);
}

.post-card-meta,
.post-meta {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0 0 0.5rem;
}

.post-card-description {
  margin: 0;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

/* Article */
.article {
  max-width: var(--measure);
  margin-inline: auto;
}

.article-hero {
  margin: 1.5rem 0 2rem;
}

.article-hero img {
  border-radius: var(--radius);
  width: 100%;
}

.prose :where(h2, h3) {
  scroll-margin-top: 1rem;
}

.post-subtitle {
  font-size: 1.25rem;
  color: var(--color-muted);
  margin: -0.25rem 0 0.75rem;
}

.summary-box {
  margin: 1.5rem 0 2rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius);
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  font-size: 1.1rem;
}

.summary-box p {
  margin: 0;
}

.summary-box .summary-label {
  margin-bottom: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}

/* Inline citations: [[1]](#source-1) */
.prose a[href^='#source-'] {
  font-size: 0.75em;
  vertical-align: super;
  line-height: 0;
  text-decoration: none;
  margin-left: 0.1em;
}

.faq,
.sources {
  margin-top: 3rem;
}

.faq h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.4rem;
}

.faq p {
  margin: 0;
}

.sources {
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.92rem;
}

.sources ol {
  padding-left: 1.25rem;
}

.sources li {
  margin-bottom: 0.9rem;
  scroll-margin-top: 1rem;
}

.sources li p {
  margin: 0.2rem 0 0;
  color: var(--color-muted);
}

.sources-note {
  color: var(--color-muted);
  font-size: 0.85rem;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 1.25rem;
  border-left: 4px solid var(--color-accent);
  color: var(--color-muted);
}

/* Inline Markdown images (product photos) sit small and centered, with the italic caption line under them. */
.prose p:has(> img:only-child) {
  margin-bottom: 0.25rem;
  text-align: center;
}

.prose p > img {
  max-width: min(100%, 320px);
  height: auto;
  border-radius: var(--radius);
}

.prose p:has(> img:only-child) + p:has(> em:only-child) {
  margin-top: 0;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.prose pre {
  background: var(--color-surface);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.prose table {
  border-collapse: collapse;
  width: 100%;
}

/* Wide tables scroll on their own instead of widening the page on phones. */
@media (max-width: 720px) {
  .prose table {
    display: block;
    overflow-x: auto;
  }
}

.prose th,
.prose td {
  border: 1px solid var(--color-border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.breadcrumbs li + li::before {
  content: '/';
  margin-right: 0.4rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
}

.tags li {
  background: var(--color-surface);
  border-radius: 999px;
  padding: 0.15rem 0.75rem;
  font-size: 0.85rem;
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.post-nav a {
  display: block;
  text-decoration: none;
}

.post-nav small {
  display: block;
  color: var(--color-muted);
}

.post-nav .next {
  text-align: right;
  grid-column: 2;
}

.related {
  margin-top: 3rem;
}

.related .post-grid {
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
}

/* Email sign-up (components/NewsletterSignup.astro) */
.newsletter {
  max-width: var(--measure);
  margin: 3rem auto 0;
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--color-surface);
  border-top: 4px solid var(--color-primary);
}

.newsletter h2 {
  margin-top: 0;
}

.newsletter form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.newsletter input[type='email'] {
  flex: 1 1 14rem;
  min-width: 0;
  padding: 0.65rem 0.8rem;
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.newsletter button,
.newsletter-unsubscribe button {
  padding: 0.65rem 1.2rem;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
}

.newsletter-trap {
  position: absolute;
  left: -9999px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2.5rem;
}

.not-found {
  text-align: center;
  padding-block: 4rem;
}

.article-hero figcaption {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* Post visuals (src/lib/visuals.ts). Content is fully visible without JS;
   PostBody.astro adds .viz-js to <html> and .is-in to each visual on scroll. */
.viz {
  --viz-tint: color-mix(in srgb, var(--color-primary) 12%, var(--color-bg));
  --viz-line: color-mix(in srgb, var(--color-ink) 35%, var(--color-bg));
  margin: 2rem 0;
  padding: 1.25rem 1.25rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: max(var(--radius), 4px);
  background: var(--color-surface);
  font-size: 0.95rem;
  line-height: 1.45;
  overflow-wrap: break-word;
}

.viz ol,
.viz ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.viz p {
  margin: 0;
}

.viz-head {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-bottom: 1.1rem;
}

.viz-kicker {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-ink);
}

.viz-title {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.3;
}

.viz-label {
  display: block;
  font-weight: 650;
}

.viz-detail {
  display: block;
  margin-top: 0.15rem;
  color: var(--color-muted);
  font-size: 0.88rem;
}

.viz-num {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 0.8rem;
  font-weight: 700;
}

.viz-note {
  margin-top: 1rem;
  font-size: 0.82rem;
  color: var(--color-muted);
}

.viz .is-hi {
  --viz-fill: var(--color-accent);
}

/* steps */
.viz-steps {
  display: grid;
  grid-template-columns: repeat(var(--n), minmax(0, 1fr));
  gap: 0.9rem;
  position: relative;
}

.viz-steps li {
  position: relative;
}

.viz-steps .viz-num {
  position: relative;
  z-index: 1;
  margin-bottom: 0.5rem;
  box-shadow: 0 0 0 4px var(--color-surface);
}

/* connector from each number to the next */
.viz-steps li:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 0.85rem;
  left: 1.7rem;
  right: -0.9rem;
  height: 2px;
  background: var(--viz-line);
  transform-origin: left;
  transition: transform 0.5s ease calc(var(--i) * 160ms + 200ms);
}

@media (max-width: 640px) {
  .viz-steps {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  .viz-steps li {
    padding-left: 2.4rem;
  }
  .viz-steps .viz-num {
    position: absolute;
    left: 0;
    top: 0;
  }
  .viz-steps li:not(:last-child)::after {
    top: 1.7rem;
    bottom: -0.75rem;
    left: 0.82rem;
    right: auto;
    width: 2px;
    height: auto;
    transform-origin: top;
  }
}

/* bars */
.viz-bars {
  display: grid;
  grid-template-columns: minmax(6rem, max-content) 1fr auto;
  gap: 0.6rem 0.8rem;
  align-items: center;
}

.viz-bars li {
  display: contents;
}

.viz-bars .viz-label {
  font-weight: 600;
  font-size: 0.9rem;
}

.viz-track {
  height: 0.85rem;
  border-radius: 999px;
  background: var(--viz-tint);
  overflow: hidden;
}

.viz-fill {
  display: block;
  height: 100%;
  width: var(--w);
  border-radius: inherit;
  background: var(--viz-fill, var(--color-primary));
}

.viz-value {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 0.88rem;
  white-space: nowrap;
}

@media (max-width: 520px) {
  .viz-bars {
    grid-template-columns: 1fr auto;
  }
  .viz-bars .viz-label {
    grid-column: 1 / -1;
    margin-bottom: -0.35rem;
  }
}

/* timeline */
.viz .viz-timeline {
  position: relative;
  display: grid;
  gap: 1rem;
  padding-left: 1.6rem;
}

.viz-line {
  position: absolute;
  left: 0.42rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  background: var(--viz-line);
  transform-origin: top;
  transition: transform 1.2s ease;
}

.viz-timeline li {
  position: relative;
}

.viz-dot {
  position: absolute;
  left: -1.6rem;
  top: 0.2rem;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  background: var(--color-bg);
  border: 3px solid var(--color-primary);
}

.viz-when {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink);
}

/* compare */
.viz-compare {
  display: grid;
  grid-template-columns: repeat(var(--n), minmax(0, 1fr));
  gap: 0.8rem;
}

.viz-col {
  padding: 0.9rem 1rem;
  border-radius: max(var(--radius), 4px);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--viz-line);
}

.viz-col.is-hi {
  border-top-color: var(--color-primary);
  box-shadow: 0 6px 18px -12px color-mix(in srgb, var(--color-primary) 60%, transparent);
}

.viz .viz-colname {
  margin: 0;
  font-size: 1rem;
}

.viz-tagline {
  color: var(--color-muted);
  font-size: 0.85rem;
}

.viz-col ul {
  margin-top: 0.6rem;
  display: grid;
  gap: 0.4rem;
}

.viz-col li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9rem;
}

.viz-col li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--color-primary);
}

@media (max-width: 640px) {
  .viz-compare {
    grid-template-columns: 1fr;
  }
}

/* cycle */
.viz-cycle {
  display: grid;
  gap: 1.25rem;
}

.viz-ring {
  position: relative;
  width: min(100% - 14rem, 21rem);
  aspect-ratio: 1;
  margin: 2.4rem auto;
}

.viz-ring svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  color: var(--color-primary);
}

.viz-ring path {
  fill: none;
  stroke: var(--viz-line);
  stroke-width: 1.2;
  stroke-linecap: round;
}

.viz-ring marker path {
  fill: var(--color-primary);
  stroke: none;
}

/* Each node is a zero-size anchor on the ring; the number centers on it and the label sits outside. */
.viz-node {
  position: absolute;
  width: 0;
  height: 0;
}

.viz-node .viz-num {
  position: absolute;
  translate: -50% -50%;
}

.viz-node .viz-label {
  position: absolute;
  width: max-content;
  max-width: 7rem;
  font-size: 0.82rem;
  line-height: 1.25;
}

.side-top .viz-label {
  bottom: 1.1rem;
  translate: -50% 0;
  text-align: center;
}

.side-bottom .viz-label {
  top: 1.1rem;
  translate: -50% 0;
  text-align: center;
}

.side-left .viz-label {
  right: 1.15rem;
  translate: 0 -50%;
  text-align: right;
}

.side-right .viz-label {
  left: 1.15rem;
  translate: 0 -50%;
}

.viz-center {
  position: absolute;
  inset: 32%;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--viz-tint);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  text-align: center;
  line-height: 1.2;
  padding: 0.4rem;
}

.viz-legend {
  display: grid;
  gap: 0.6rem;
}

.viz-legend li {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
}

/* The legend repeats the labels, so wide screens only need it when there are details. */
.viz-legend--short {
  display: none;
}

@media (max-width: 520px) {
  .viz-ring {
    width: min(100%, 15rem);
    margin: 1rem auto;
  }
  .viz-node .viz-label {
    display: none;
  }
  .viz-center {
    inset: 26%;
    font-size: 0.75rem;
    hyphens: auto;
  }
  .viz-legend--short {
    display: grid;
  }
}

/* spectrum */
.viz-ends {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.viz-band {
  position: relative;
  height: 0.9rem;
  margin: 0.6rem 0.85rem 1.4rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--viz-tint), var(--color-primary));
  transform-origin: left;
}

.viz-marker {
  position: absolute;
  top: 50%;
  translate: -50% -50%;
  display: grid;
  place-items: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-text);
  font-size: 0.78rem;
  font-weight: 700;
}

@media (max-width: 520px) {
  .viz-marker {
    width: 1.45rem;
    height: 1.45rem;
    font-size: 0.7rem;
  }
}

/* stats */
.viz-stats {
  display: grid;
  grid-template-columns: repeat(var(--n), minmax(0, 1fr));
  gap: 0.8rem;
}

.viz-stats li {
  padding: 0.9rem 0.8rem;
  border-radius: max(var(--radius), 4px);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.viz-big {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

.viz-big.is-long {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
}

.viz-stats .viz-label {
  margin-top: 0.3rem;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--color-muted);
}

@media (max-width: 640px) {
  .viz-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* matrix */
.viz-matrix {
  display: grid;
  grid-template-columns: 1.4rem auto 1fr 1fr;
  grid-template-rows: auto 1fr 1fr auto auto;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--color-muted);
}

.viz-axis {
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text);
}

.viz-axis-y {
  grid-row: 2 / 4;
  grid-column: 1;
  writing-mode: vertical-rl;
  rotate: 180deg;
  text-align: center;
}

.viz-yhi {
  grid-row: 2;
  grid-column: 2;
  align-self: start;
  writing-mode: vertical-rl;
  rotate: 180deg;
}

.viz-ylo {
  grid-row: 3;
  grid-column: 2;
  align-self: end;
  writing-mode: vertical-rl;
  rotate: 180deg;
}

.viz-grid {
  grid-row: 2 / 4;
  grid-column: 3 / 5;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.viz-quad {
  padding: 0.75rem;
  border-radius: max(var(--radius), 4px);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.9rem;
}

.viz-quad.is-hi {
  background: var(--viz-tint);
  border-color: var(--color-primary);
}

.viz-xlo {
  grid-row: 4;
  grid-column: 3;
}

.viz-xhi {
  grid-row: 4;
  grid-column: 4;
  text-align: right;
}

.viz-axis-x {
  grid-row: 5;
  grid-column: 3 / 5;
  text-align: center;
}

/* split */
.viz-split {
  display: grid;
  gap: 0.5rem;
}

.viz-split-head,
.viz-split-row {
  display: grid;
  grid-template-columns: 1fr 1.5rem 1fr;
  gap: 0.6rem;
  align-items: center;
}

.viz-split-head {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.viz-split-head span:first-child {
  color: var(--color-muted);
}

.viz-split-head span:last-child {
  grid-column: 3;
  color: var(--color-ink);
}

.viz-left,
.viz-right {
  padding: 0.6rem 0.75rem;
  border-radius: max(var(--radius), 4px);
  font-size: 0.9rem;
  height: 100%;
}

.viz-left {
  background: var(--color-bg);
  color: var(--color-muted);
}

.viz-right {
  background: var(--viz-tint);
  font-weight: 600;
}

.viz-arrow {
  text-align: center;
  color: var(--color-ink);
  font-weight: 700;
}

@media (max-width: 520px) {
  .viz-split-head {
    display: none;
  }
  .viz-split-row {
    grid-template-columns: 1fr;
    gap: 0.2rem;
    margin-bottom: 0.4rem;
  }
  .viz-arrow {
    display: none;
  }
}

/* funnel */
.viz-funnel {
  display: grid;
  gap: 0.35rem;
  justify-items: center;
}

.viz-funnel li {
  width: var(--w);
  padding: 0.6rem 0.9rem;
  border-radius: max(var(--radius), 4px);
  background: color-mix(in srgb, var(--color-primary) calc(14% + var(--i) * 16%), var(--color-bg));
  text-align: center;
}

.viz-funnel li:nth-last-child(-n + 2) {
  color: var(--color-on-primary);
}

.viz-funnel li:nth-last-child(-n + 2) .viz-detail {
  color: color-mix(in srgb, var(--color-on-primary) 85%, transparent);
}

@media (max-width: 520px) {
  .viz-funnel li {
    width: calc(100% - var(--i) * 6%);
  }
}

/* decision */
.viz-q {
  margin-inline: auto !important;
  max-width: 26rem;
  padding: 0.7rem 1rem;
  border-radius: max(var(--radius), 4px);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 700;
  text-align: center;
}

.viz-links {
  display: block;
  width: 2px;
  height: 1rem;
  margin: 0 auto;
  background: var(--viz-line);
}

/* Horizontal rail from the first branch's center to the last one's, and a stub down to each. */
.viz .viz-branches {
  position: relative;
  padding-top: 1rem;
}

.viz-branches::before {
  content: '';
  position: absolute;
  top: 0;
  --half: calc((100% - (var(--n) - 1) * 0.7rem) / var(--n) / 2);
  left: var(--half);
  right: var(--half);
  height: 2px;
  background: var(--viz-line);
  transition: transform 0.5s ease 0.25s;
}

.viz-branches li {
  position: relative;
}

.viz-branches li::before {
  content: '';
  position: absolute;
  top: -1rem;
  left: 50%;
  width: 2px;
  height: 1rem;
  background: var(--viz-line);
}

.viz .viz-branches {
  display: grid;
  grid-template-columns: repeat(var(--n), minmax(0, 1fr));
  gap: 0.7rem;
}

.viz-branches li {
  padding: 0.75rem 0.85rem;
  border-radius: max(var(--radius), 4px);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.viz-answer {
  display: inline-block;
  margin-bottom: 0.35rem;
  padding: 0.05rem 0.55rem;
  border-radius: 999px;
  background: var(--viz-tint);
  color: var(--color-ink);
  font-size: 0.75rem;
  font-weight: 700;
}

@media (max-width: 560px) {
  .viz-links,
  .viz-branches::before,
  .viz-branches li::before {
    display: none;
  }
  .viz .viz-branches {
    grid-template-columns: 1fr;
    padding-top: 0.7rem;
  }
}

/* Animations: hidden start states apply only once JS is ready to reveal them. */
.viz-js .viz :is(.viz-a, .viz-pop, .viz-grow, .viz-line, .viz-draw) {
  transition-property: opacity, transform, translate, scale, stroke-dashoffset;
  transition-duration: 0.55s;
  transition-timing-function: cubic-bezier(0.2, 0.7, 0.2, 1);
  transition-delay: calc(var(--i, 0) * 110ms);
}

.viz-js .viz:not(.is-in) .viz-a {
  opacity: 0;
  transform: translateY(10px);
}

.viz-js .viz:not(.is-in) .viz-pop {
  opacity: 0;
  scale: 0.6;
}

.viz-js .viz .viz-grow {
  transform-origin: left;
}

.viz-js .viz--funnel .viz-grow {
  transform-origin: center;
}

.viz-js .viz:not(.is-in) .viz-grow {
  transform: scaleX(0);
}

.viz-js .viz--funnel:not(.is-in) .viz-grow {
  opacity: 0;
}

.viz-js .viz-fill {
  transform-origin: left;
  transition: transform 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) calc(var(--i) * 120ms);
}

.viz-js .viz:not(.is-in) .viz-line,
.viz-js .viz:not(.is-in) .viz-steps li::after {
  transform: scaleY(0);
}

.viz-js .viz--steps:not(.is-in) .viz-steps li::after {
  transform: scaleX(0);
}

@media (max-width: 640px) {
  .viz-js .viz--steps:not(.is-in) .viz-steps li::after {
    transform: scaleY(0);
  }
}

.viz-js .viz .viz-draw {
  stroke-dasharray: 1;
  transition-duration: 0.6s;
  transition-delay: calc(var(--i, 0) * 180ms + 250ms);
}

.viz-js .viz:not(.is-in) .viz-branches::before {
  transform: scaleX(0);
}

.viz-js .viz:not(.is-in) .viz-draw {
  stroke-dashoffset: 1;
}

/* A slow pulse on the highlighted item once it has appeared. */
@keyframes viz-pulse {
  50% {
    box-shadow: 0 0 0 6px color-mix(in srgb, var(--color-primary) 18%, transparent);
  }
}

.viz-js .viz.is-in .viz-quad.is-hi,
.viz-js .viz.is-in .viz-col.is-hi {
  animation: viz-pulse 2.4s ease-in-out 1.2s 2;
}