:root {
  --portfolio-accent: var(--c-themeHueBlue, #2e86ab);
  --portfolio-border: color-mix(in srgb, currentColor 20%, transparent);
  --portfolio-surface: var(--c-articleBackground, #efefef);
  --portfolio-text: var(--c-pageText, #101010);
  --portfolio-muted: var(--c-subtitle, #515151);
  --portfolio-radius: 0.35rem;
  --portfolio-max: 76rem;
  --portfolio-reading: 52rem;
}

html {
  scroll-behavior: smooth;
}

body {
  display: block;
  min-height: 100vh;
  color: var(--portfolio-text);
  line-height: 1.65;
}

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

a {
  text-underline-offset: 0.18em;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 0.2rem solid var(--portfolio-accent);
  outline-offset: 0.2rem;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10000;
  padding: 0.65rem 0.9rem;
  color: #fff;
  background: #101010;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 100;
  width: 100%;
  padding: 1.25rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--portfolio-border);
  background: var(--c-pageBackground);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100%, var(--portfolio-max));
  margin: 0 auto;
  gap: 1.5rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-width: max-content;
  color: var(--portfolio-text);
  text-decoration: none;
}

.site-brand:link,
.site-brand:visited {
  color: var(--portfolio-text);
}

.site-brand__mark {
  display: grid;
  width: 2.6rem;
  height: 2.6rem;
  place-items: center;
  border: 2px solid var(--portfolio-accent);
  border-radius: 50%;
  color: var(--portfolio-accent);
  font-family: var(--f-header);
  font-weight: 700;
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.site-brand__text span {
  margin-top: 0.2rem;
  color: var(--portfolio-muted);
  font-family: var(--f-text);
  font-size: 0.74rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-menu-toggle {
  display: none;
  width: 2.8rem;
  height: 2.8rem;
  padding: 0.55rem;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: transparent;
  cursor: pointer;
}

.site-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 0.28rem 0;
  background: currentColor;
}

.site-navigation__list,
.site-navigation__sublist {
  padding: 0;
  margin: 0;
  list-style: none;
}

.site-navigation__list {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.site-navigation__item {
  position: relative;
}

.site-navigation a,
.site-navigation summary {
  display: block;
  padding: 0.65rem 0.72rem;
  color: var(--portfolio-text);
  font-family: var(--f-header);
  font-size: 0.86rem;
  text-decoration: none;
  cursor: pointer;
}

.site-navigation a:hover,
.site-navigation summary:hover,
.site-navigation a[aria-current="page"] {
  color: var(--portfolio-accent);
}

.site-navigation__group summary {
  list-style: none;
}

.site-navigation__group summary::-webkit-details-marker {
  display: none;
}

.site-navigation__group summary::after {
  content: " +";
  color: var(--portfolio-accent);
}

.site-navigation__group[open] summary::after {
  content: " −";
}

.site-navigation__sublist {
  position: absolute;
  top: calc(100% + 0.25rem);
  left: 0;
  min-width: 12rem;
  padding: 0.45rem;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--c-pageBackground);
  box-shadow: 0 0.75rem 2rem rgb(0 0 0 / 12%);
}

.site-navigation__sublist a {
  white-space: nowrap;
}

.portfolio-main,
.page-shell {
  width: min(100% - 2rem, var(--portfolio-max));
  margin: 0 auto;
}

.page-shell {
  max-width: var(--portfolio-reading);
  padding: clamp(3rem, 7vw, 6rem) 0;
}

.page-shell--wide {
  max-width: var(--portfolio-max);
}

.portfolio-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(15rem, 0.7fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 6rem);
  min-height: 42rem;
  padding: clamp(4rem, 8vw, 7rem) 0;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--portfolio-accent);
  font-family: var(--f-header);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-hero h1 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(3.3rem, 8vw, 7rem);
  line-height: 0.92;
  letter-spacing: -0.055em;
}

.portfolio-hero h1 span {
  display: block;
  max-width: 26ch;
  margin-top: 1rem;
  color: var(--portfolio-accent);
  font-size: clamp(1.2rem, 2.8vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.portfolio-hero__lead,
.page-heading__lead {
  max-width: 44rem;
  color: var(--portfolio-muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.hero-facts {
  display: grid;
  gap: 0.55rem;
  padding: 0;
  margin: 1.75rem 0;
  list-style: none;
}

.hero-facts li {
  position: relative;
  padding-left: 1.15rem;
}

.hero-facts li::before {
  position: absolute;
  top: 0.7em;
  left: 0;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--portfolio-accent);
  content: "";
}

.portfolio-hero__portrait,
.about-layout__portrait {
  margin: 0;
}

.portfolio-hero__portrait picture,
.about-layout__portrait picture {
  display: block;
  overflow: hidden;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: #fff;
}

.portfolio-hero__portrait img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.portfolio-hero__portrait figcaption,
.about-layout__portrait figcaption {
  margin-top: 0.55rem;
  color: var(--portfolio-muted);
  font-size: 0.78rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

.portfolio-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  padding: 0.6rem 1rem;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  color: var(--portfolio-text);
  font-family: var(--f-header);
  font-weight: 700;
  text-decoration: none;
}

.portfolio-button:link,
.portfolio-button:visited {
  color: var(--portfolio-text);
}

.portfolio-button:hover {
  border-color: var(--portfolio-accent);
  color: var(--portfolio-accent);
}

.portfolio-button--primary {
  border-color: var(--portfolio-accent);
  color: #fff;
  background: var(--portfolio-accent);
}

.portfolio-button--primary:link,
.portfolio-button--primary:visited,
.portfolio-button--primary:hover {
  color: #fff;
}

.content-section {
  padding: clamp(3.5rem, 7vw, 6.5rem) 0;
  border-top: 1px solid var(--portfolio-border);
}

.content-section--wide {
  width: 100%;
}

.section-heading {
  max-width: 48rem;
  margin-bottom: 2rem;
}

.section-heading h2,
.page-heading h1,
.project-heading h1,
.post-heading h1 {
  margin: 0 0 0.8rem;
  font-size: clamp(2.1rem, 5vw, 4.3rem);
  line-height: 1.03;
  letter-spacing: -0.04em;
}

.section-heading > p:last-child {
  color: var(--portfolio-muted);
}

.section-heading--with-link {
  display: flex;
  align-items: end;
  justify-content: space-between;
  max-width: none;
  gap: 2rem;
}

.text-link {
  color: var(--portfolio-accent);
  font-family: var(--f-header);
  font-weight: 700;
}

.domain-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.8rem;
}

.domain-card {
  min-height: 16rem;
  padding: 1.25rem;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-surface);
}

.domain-card__index {
  color: var(--portfolio-accent);
  font-family: var(--f-header);
  font-size: 0.75rem;
  font-weight: 700;
}

.domain-card h3 {
  margin-top: 2.5rem;
}

.domain-card p {
  color: var(--portfolio-muted);
  font-size: 0.9rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.project-card {
  overflow: hidden;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-surface);
}

.project-card__media {
  display: block;
  overflow: hidden;
  border-bottom: 1px solid var(--portfolio-border);
  background: #fff;
}

.project-card__media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.project-card__media:hover img {
  transform: scale(1.015);
}

.project-card__body {
  padding: clamp(1.1rem, 3vw, 1.7rem);
}

.project-card__body h2 {
  margin: 1rem 0 0.65rem;
}

.project-card__body h2 a {
  color: var(--portfolio-text);
  text-decoration: none;
}

.project-card__body > p {
  color: var(--portfolio-muted);
}

.project-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  color: var(--portfolio-muted);
  font-size: 0.76rem;
}

.project-card__diagram,
.project-heading__diagram {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  padding: 3rem 1.5rem;
  color: var(--portfolio-accent);
  background: color-mix(in srgb, var(--portfolio-accent) 8%, var(--portfolio-surface));
}

.project-card__diagram span,
.project-heading__diagram span {
  padding: 0.8rem 0.45rem;
  border: 1px solid currentColor;
  text-align: center;
  font-family: var(--f-header);
  font-size: 0.72rem;
}

.evidence-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 1.65rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-family: var(--f-header);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.evidence-badge--source {
  color: #2e6f9e;
}

.evidence-badge--executed {
  color: #4f7d00;
}

.evidence-badge--measured {
  color: #7d3d9b;
}

.evidence-badge--blocked {
  color: #a13025;
}

.split-section,
.evidence-section {
  display: grid;
  grid-template-columns: minmax(14rem, 0.7fr) minmax(0, 1.3fr);
  gap: clamp(2rem, 6vw, 6rem);
}

.publication-list {
  padding: 0;
  margin: 0;
  list-style: none;
}

.publication-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--portfolio-border);
}

.publication-list li > span {
  color: var(--portfolio-accent);
  font-family: var(--f-header);
  font-size: 0.75rem;
  font-weight: 700;
}

.publication-list h2,
.publication-list h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.publication-list p {
  margin: 0;
  color: var(--portfolio-muted);
  font-size: 0.8rem;
}

.publication-list--page li {
  align-items: start;
  padding: 1.7rem 0;
}

.evidence-key {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  list-style: none;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.post-card,
.post-list article {
  padding: 1.3rem;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-surface);
}

.post-card h3,
.post-list h2 {
  margin: 0.45rem 0;
}

.post-card h3 a,
.post-list h2 a {
  color: var(--portfolio-text);
  text-decoration: none;
}

.post-card__meta {
  margin: 0;
  color: var(--portfolio-accent);
  font-family: var(--f-header);
  font-size: 0.72rem;
}

.page-heading {
  margin-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-heading h1 {
  max-width: 15ch;
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(13rem, 0.55fr) minmax(0, 1.45fr);
  align-items: start;
  gap: clamp(2rem, 6vw, 5rem);
}

.about-layout__portrait {
  position: sticky;
  top: 1.5rem;
}

.prose {
  color: var(--portfolio-text);
}

.prose h2 {
  margin: 2.3rem 0 0.75rem;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.prose h3 {
  margin-top: 1.7rem;
}

.prose p,
.prose li {
  max-width: 72ch;
}

.prose li + li {
  margin-top: 0.45rem;
}

.filter-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 2rem;
}

.filter-links a {
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--portfolio-border);
  border-radius: 999px;
  color: var(--portfolio-muted);
  font-size: 0.78rem;
  text-decoration: none;
}

.filter-links a:hover {
  border-color: var(--portfolio-accent);
  color: var(--portfolio-accent);
}

.breadcrumbs {
  display: flex;
  gap: 0.45rem;
  margin-bottom: 2rem;
  color: var(--portfolio-muted);
  font-size: 0.82rem;
}

.project-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(17rem, 0.8fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  margin-bottom: 4rem;
}

.project-heading picture {
  overflow: hidden;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: #fff;
}

.project-heading img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.case-study-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.case-study-grid section,
.boundary-panel {
  padding: 1.5rem;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-surface);
}

.case-study-grid h2,
.boundary-panel h2 {
  margin-top: 0;
  font-size: 1.2rem;
}

.boundary-panel {
  margin: 1rem 0 3rem;
  border-left: 0.35rem solid var(--portfolio-accent);
}

.post-list {
  display: grid;
  gap: 1rem;
}

.post-heading {
  margin-bottom: 3rem;
}

.role-list {
  border-top: 1px solid var(--portfolio-border);
}

.role-list > section {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 1.5rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--portfolio-border);
}

.role-list > section > span {
  color: var(--portfolio-accent);
  font-family: var(--f-header);
  font-weight: 700;
}

.role-list h2 {
  margin-top: 0;
}

.site-footer {
  width: 100%;
  padding: 3rem clamp(1rem, 4vw, 3rem);
  border-top: 1px solid var(--portfolio-border);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  width: min(100%, var(--portfolio-max));
  margin: 0 auto;
  gap: 1.5rem;
}

.site-footer p {
  margin: 0.35rem 0 0;
  color: var(--portfolio-muted);
  font-size: 0.78rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.site-footer__credit {
  grid-column: 1 / -1;
}

@media (max-width: 68rem) {
  .domain-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .site-menu-toggle {
    display: block;
  }

  .site-navigation {
    position: absolute;
    top: 100%;
    right: 1rem;
    left: 1rem;
    display: none;
    padding: 0.75rem;
    border: 1px solid var(--portfolio-border);
    border-radius: var(--portfolio-radius);
    background: var(--c-pageBackground);
    box-shadow: 0 0.75rem 2rem rgb(0 0 0 / 15%);
  }

  .site-navigation.is-open {
    display: block;
  }

  .site-navigation__list {
    display: block;
  }

  .site-navigation__sublist {
    position: static;
    margin-left: 1rem;
    border: 0;
    box-shadow: none;
  }
}

@media (max-width: 48rem) {
  .site-brand__text span {
    display: none;
  }

  .portfolio-hero,
  .project-heading,
  .about-layout,
  .split-section,
  .evidence-section {
    grid-template-columns: 1fr;
  }

  .portfolio-hero {
    min-height: 0;
    padding-top: 3rem;
  }

  .portfolio-hero__portrait {
    max-width: 23rem;
  }

  .about-layout__portrait {
    position: static;
    max-width: 20rem;
  }

  .domain-grid,
  .project-grid,
  .post-grid,
  .case-study-grid {
    grid-template-columns: 1fr;
  }

  .domain-card {
    min-height: 0;
  }

  .section-heading--with-link {
    align-items: start;
    flex-direction: column;
    gap: 0.5rem;
  }

  .publication-list li {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .publication-list li > a {
    grid-column: 2;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .site-footer__credit {
    grid-column: 1;
  }
}

@media (max-width: 30rem) {
  .portfolio-main,
  .page-shell {
    width: min(100% - 1.25rem, var(--portfolio-max));
  }

  .portfolio-hero h1 {
    font-size: clamp(3rem, 18vw, 4.8rem);
  }

  .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .portfolio-button {
    width: 100%;
  }

  .project-card__diagram,
  .project-heading__diagram {
    grid-template-columns: 1fr;
  }
}

.blog-tools,
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0;
  list-style: none;
}

.blog-tools {
  margin: 0 0 2rem;
}

.blog-tools a,
.chip-list a,
.chip-list li {
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--portfolio-border);
  border-radius: 999px;
}

.blog-search {
  margin: 0 0 clamp(2rem, 6vw, 4rem);
  padding: 1rem;
  border: 1px solid var(--portfolio-border);
  background: var(--portfolio-surface);
}

.blog-search label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.blog-search input {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--portfolio-border);
  color: var(--portfolio-text);
  background: var(--c-pageBackground);
}

.blog-with-sidebar {
  display: grid;
  grid-template-columns: minmax(13rem, 17rem) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.study-sidebar {
  position: sticky;
  top: 6rem;
  max-height: calc(100vh - 7rem);
  overflow: auto;
  padding: 1rem;
  border: 1px solid var(--portfolio-border);
  background: var(--portfolio-surface);
}

.study-sidebar h2 {
  margin-top: 0;
  font-size: 1.05rem;
}

.study-sidebar > summary {
  display: none;
  cursor: pointer;
  font-family: var(--f-header);
  font-size: 1.05rem;
  font-weight: 700;
}

.study-sidebar ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.study-sidebar > ul > li + li {
  margin-top: 0.65rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--portfolio-border);
}

.study-sidebar li ul {
  margin: 0.35rem 0 0 0.75rem;
}

.study-sidebar a {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.25rem 0;
}

.study-sidebar small {
  color: var(--portfolio-muted);
  font-variant-numeric: tabular-nums;
}

.search-results {
  margin-bottom: 0;
}

.search-results li {
  padding: 0.75rem 0;
  border-top: 1px solid var(--portfolio-border);
}

.search-results a,
.search-results small {
  display: block;
}

.search-results p,
.small-note {
  color: var(--portfolio-muted);
  font-size: 0.86rem;
}

.taxonomy-grid,
.series-grid,
.learning-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 3rem;
}

.taxonomy-grid article,
.series-grid article,
.learning-grid article {
  padding: 1rem;
  border: 1px solid var(--portfolio-border);
  background: var(--portfolio-surface);
}

.taxonomy-grid h2,
.taxonomy-grid h3,
.series-grid h3,
.learning-grid h2,
.learning-grid h3 {
  margin-top: 0;
}

.status-line,
.status-banner {
  color: var(--portfolio-accent);
  font-family: var(--f-mono);
  font-size: 0.76rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.status-banner,
.boundary-note {
  padding: 1rem;
  border-left: 0.25rem solid var(--portfolio-accent);
  background: var(--portfolio-surface);
}

.post-facts,
.compact-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1.5rem 0;
  border-top: 1px solid var(--portfolio-border);
}

.post-facts div,
.compact-facts div {
  padding: 0.75rem;
  border-bottom: 1px solid var(--portfolio-border);
}

.post-facts dt,
.compact-facts dt {
  font-weight: 700;
}

.post-facts dd,
.compact-facts dd {
  margin: 0.25rem 0 0;
  overflow-wrap: anywhere;
}

.post-toc,
.category-index,
.series-meta {
  margin: 1.5rem 0;
  padding: 1rem;
  border: 1px solid var(--portfolio-border);
  background: var(--portfolio-surface);
}

.post-toc summary,
.category-index summary,
.series-meta summary {
  cursor: pointer;
  font-weight: 700;
}

.post__content img {
  width: 100%;
  height: auto;
  max-height: 42rem;
  object-fit: contain;
}

.post__content figure {
  margin: 2rem 0;
}

.rf-formula-list {
  display: grid;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.rf-formula-list code {
  display: block;
  overflow-x: auto;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--color-accent, #1d6fa5);
  background: #f3f7fa;
  color: #13293d;
  font-size: clamp(0.9rem, 2vw, 1.05rem);
  white-space: nowrap;
}

.rf-study-group + .rf-study-group {
  margin-top: 4rem;
}

.rf-study-hub .track-card-grid article {
  min-width: 0;
}

.rf-study-hub .study-post-card__media img {
  aspect-ratio: 40 / 21;
  object-fit: cover;
}

.rf-calculator {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2.5rem;
  padding: clamp(1rem, 3vw, 2rem);
  border: 1px solid var(--portfolio-border);
  background: var(--portfolio-surface);
}

.rf-calculator label,
.rf-calculator fieldset {
  display: grid;
  gap: 0.4rem;
  min-width: 0;
}

.rf-calculator input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--portfolio-border);
  background: #fff;
  color: #13293d;
  font: inherit;
}

.rf-calculator fieldset {
  padding: 1rem;
  border: 1px solid var(--portfolio-border);
}

.rf-calculator__result {
  grid-column: 1 / -1;
  min-height: 7rem;
  padding: 1rem;
  border-left: 4px solid #1d6fa5;
  background: #f3f7fa;
  color: #13293d;
  white-space: pre-wrap;
}

.rf-calculator__result[data-state="error"] {
  border-color: #b42318;
}

@media (max-width: 46rem) {
  .rf-calculator {
    grid-template-columns: 1fr;
  }
}

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

.post__content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.post__content th,
.post__content td {
  padding: 0.6rem;
  border: 1px solid var(--portfolio-border);
  text-align: left;
}

.series-navigation {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 2rem 0;
  padding: 1rem 0;
  border-block: 1px solid var(--portfolio-border);
}

.series-list,
.roadmap-steps {
  padding: 0;
  list-style: none;
}

.series-list li,
.roadmap-steps li {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.8rem 0;
  border-top: 1px solid var(--portfolio-border);
}

.series-list small {
  display: block;
  color: var(--portfolio-muted);
}

.series-list .is-planned {
  color: var(--portfolio-muted);
}

.learning-paths li,
.archive-list li {
  margin-block: 0.6rem;
}

.study-post-card {
  display: grid;
  grid-template-columns: minmax(12rem, 14rem) minmax(0, 1fr);
  overflow: hidden;
  padding: 0 !important;
}

.study-post-card__media,
.course-hub-card__media,
.track-card__media {
  display: block;
  overflow: hidden;
  background: #fff;
}

.study-post-card__media img {
  width: 100%;
  height: 100%;
  min-height: 12rem;
  object-fit: cover;
}

.study-post-card__body,
.course-hub-grid article > div,
.track-card-grid article > div {
  padding: 1.25rem;
}

.study-post-card__body > p:last-of-type,
.course-hub-grid article p,
.track-card-grid article p {
  color: var(--portfolio-muted);
}

.study-hub-hero,
.category-feature {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(18rem, 0.95fr);
  align-items: center;
  gap: clamp(1.5rem, 5vw, 4rem);
  margin-bottom: clamp(2.5rem, 6vw, 5rem);
}

.study-hub-hero h1 {
  margin: 0 0 0.8rem;
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  line-height: 1.03;
  letter-spacing: -0.04em;
}

.study-hub-hero img,
.category-feature img,
.study-unit__cover img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: #fff;
}

.study-sequence-note,
.study-next,
.official-source-list {
  margin: 1.5rem 0 3rem;
  padding: 1rem 1.2rem;
  border-left: 0.3rem solid var(--portfolio-accent);
  background: var(--portfolio-surface);
}

.course-hub-grid,
.track-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 3rem;
}

.course-hub-grid article,
.track-card-grid article {
  overflow: hidden;
  padding: 0;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-surface);
}

.course-hub-card__media img,
.track-card__media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 0.25s ease;
}

.course-hub-card__media:hover img,
.track-card__media:hover img {
  transform: scale(1.015);
}

.course-hub-grid h2,
.course-hub-grid h3,
.track-card-grid h3 {
  margin: 0.45rem 0;
}

.course-hub-grid h2 a,
.course-hub-grid h3 a,
.track-card-grid h3 a {
  color: var(--portfolio-text);
  text-decoration: none;
}

.course-unit-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  padding: 0;
  list-style: none;
}

.course-unit-grid a {
  display: flex;
  min-height: 10.5rem;
  padding: 1rem;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  flex-direction: column;
  gap: 0.45rem;
  color: var(--portfolio-text);
  background: var(--portfolio-surface);
  text-decoration: none;
}

.course-unit-grid span,
.course-unit-grid small {
  color: var(--portfolio-accent);
}

.course-unit-grid small {
  margin-top: auto;
  font-size: 0.78rem;
}

.study-unit {
  max-width: 70rem;
  margin: 0 auto;
}

.study-unit__cover {
  margin: 0 0 2.5rem;
}

.study-unit__cover figcaption {
  margin-top: 0.5rem;
  color: var(--portfolio-muted);
  font-size: 0.85rem;
}

.unit-navigation {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: center;
  gap: 1rem;
  margin-top: 3rem;
  padding: 1rem 0;
  border-block: 1px solid var(--portfolio-border);
  text-align: center;
}

.unit-navigation a:first-child {
  text-align: left;
}

.unit-navigation a:last-child {
  text-align: right;
}

.official-source-list li + li {
  margin-top: 0.45rem;
}

@media (max-width: 48rem) {
  .blog-with-sidebar {
    grid-template-columns: 1fr;
  }

  .study-sidebar {
    position: static;
    max-height: none;
  }

  .study-sidebar > summary {
    display: list-item;
  }

  .study-sidebar[open] > summary {
    margin-bottom: 1rem;
  }

  .study-post-card,
  .study-hub-hero,
  .category-feature,
  .course-hub-grid,
  .track-card-grid,
  .course-unit-grid,
  .unit-navigation {
    grid-template-columns: 1fr;
  }

  .study-post-card__media img {
    min-height: 0;
    aspect-ratio: 16 / 9;
  }

  .section-heading h2,
  .page-heading h1,
  .project-heading h1,
  .post-heading h1,
  .study-hub-hero h1 {
    font-size: clamp(2rem, 11vw, 3.1rem);
    overflow-wrap: anywhere;
  }

  .course-unit-grid a {
    min-height: 0;
  }

  .unit-navigation a,
  .unit-navigation a:first-child,
  .unit-navigation a:last-child {
    text-align: left;
  }

  .taxonomy-grid,
  .series-grid,
  .learning-grid,
  .post-facts,
  .compact-facts {
    grid-template-columns: 1fr;
  }

  .series-navigation {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .button-row,
  .filter-links {
    display: none;
  }

  body {
    color: #000;
    background: #fff;
  }

  .page-shell,
  .portfolio-main {
    width: 100%;
  }
}

/* Recruiter contact and research-publication extensions. */
.availability-badge,
.career-tier,
.career-focus-grid__label {
  display: inline-flex;
  width: fit-content;
  margin: 0 0 0.8rem;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--portfolio-accent);
  border-radius: 999px;
  color: var(--portfolio-accent);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.portfolio-hero--recruiting h1 {
  margin-bottom: 0.55rem;
}

.hero-focus {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin-bottom: 1.1rem;
  font-family: var(--f-header);
  font-size: clamp(1.15rem, 2.2vw, 1.65rem);
}

.hero-focus span {
  color: var(--portfolio-muted);
  font-size: 0.86em;
}

.hero-actions {
  margin-top: 1.5rem;
}

.career-focus-grid,
.home-metric-grid,
.publication-index-grid,
.contact-links-grid,
.project-narrative {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.career-focus-grid article,
.home-metric-card,
.publication-index-grid section,
.contact-links-grid section,
.project-narrative section {
  padding: clamp(1.1rem, 3vw, 1.7rem);
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-surface);
}

.career-focus-grid h3,
.home-metric-card h3,
.publication-index-grid h2,
.project-narrative h2 {
  margin-top: 0;
}

.home-metric-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.metric-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0;
}

.metric-list div {
  min-width: 6.5rem;
  padding: 0.65rem 0.8rem;
  border-left: 0.2rem solid var(--portfolio-accent);
  background: color-mix(in srgb, var(--portfolio-accent) 8%, transparent);
}

.metric-list dt {
  color: var(--portfolio-muted);
  font-size: 0.76rem;
}

.metric-list dd {
  margin: 0;
  font-family: var(--f-header);
  font-size: 1.15rem;
  font-weight: 700;
}

.publication-stack {
  display: grid;
  gap: 1.5rem;
}

.publication-card {
  display: grid;
  grid-template-columns: minmax(13rem, 0.72fr) minmax(0, 1.65fr);
  overflow: hidden;
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-surface);
}

.publication-card__preview {
  display: flex;
  min-height: 22rem;
  padding: 1rem;
  flex-direction: column;
  justify-content: center;
  border-right: 1px solid var(--portfolio-border);
  background: color-mix(in srgb, var(--portfolio-text) 4%, var(--portfolio-surface));
}

.publication-card__preview img,
.publication-preview img {
  width: 100%;
  height: auto;
  max-height: 32rem;
  object-fit: contain;
  background: #fff;
}

.publication-card__zoom,
.publication-preview button {
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--portfolio-border);
  color: var(--portfolio-text);
  background: transparent;
  cursor: pointer;
}

.publication-card__placeholder {
  display: grid;
  min-height: 18rem;
  padding: 1.5rem;
  place-content: center;
  gap: 0.5rem;
  border: 1px dashed var(--portfolio-border);
  text-align: center;
}

.publication-card__placeholder span,
.publication-card__venue,
.publication-card__authors,
.publication-card__role,
.verification-note {
  color: var(--portfolio-muted);
}

.publication-card__content {
  padding: clamp(1.2rem, 3vw, 2rem);
}

.publication-card__content h2 {
  margin: 0.65rem 0;
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.verification-note {
  padding: 0.7rem 0.85rem;
  border-left: 0.2rem solid var(--portfolio-border);
  font-size: 0.86rem;
}

.research-summary,
.contact-callout,
.evidence-compact {
  margin: 0 0 clamp(2rem, 6vw, 4rem);
  padding: clamp(1.2rem, 4vw, 2rem);
  border: 1px solid var(--portfolio-border);
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-surface);
}

.publication-index-grid {
  margin-top: clamp(2rem, 6vw, 4rem);
}

.research-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.research-timeline li {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--portfolio-border);
}

.research-timeline time {
  color: var(--portfolio-accent);
  font-family: var(--f-header);
  font-weight: 700;
}

.research-timeline h3,
.research-timeline p {
  margin: 0;
}

.evidence-compact {
  width: min(100% - 2rem, var(--portfolio-max));
  margin-inline: auto;
}

.profile-facts,
.contact-facts,
.publication-facts {
  display: grid;
  margin: 0 0 2rem;
  border-top: 1px solid var(--portfolio-border);
}

.profile-facts div,
.contact-facts div,
.publication-facts div {
  display: grid;
  grid-template-columns: minmax(9rem, 0.45fr) minmax(0, 1fr);
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--portfolio-border);
}

.profile-facts dt,
.contact-facts dt,
.publication-facts dt {
  font-weight: 700;
}

.profile-facts dd,
.contact-facts dd,
.publication-facts dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
}

.contact-callout {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
}

.contact-callout h2,
.contact-callout p {
  margin-bottom: 0.4rem;
}

.publication-detail__heading {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(14rem, 0.55fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: start;
  margin-bottom: 2rem;
}

.publication-preview {
  margin: 0;
}

.publication-preview figcaption,
.project-gallery figcaption {
  margin-top: 0.5rem;
  color: var(--portfolio-muted);
  font-size: 0.82rem;
}

.publication-sections,
.project-narrative {
  margin: 2rem 0;
}

.inline-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 0;
  list-style: none;
}

.inline-list li {
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--portfolio-border);
  border-radius: 999px;
}

.project-gallery {
  margin: 2rem 0;
}

.project-gallery > div {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.project-gallery figure {
  margin: 0;
  padding: 1rem;
  border: 1px solid var(--portfolio-border);
  background: var(--portfolio-surface);
}

.project-gallery__zoom {
  position: relative;
  display: grid;
  width: 100%;
  min-height: clamp(15rem, 34vw, 28rem);
  padding: 0;
  place-items: center;
  border: 0;
  color: inherit;
  background: transparent;
  cursor: zoom-in;
}

.project-gallery__zoom:focus-visible {
  outline: 3px solid var(--portfolio-accent);
  outline-offset: 0.35rem;
}

.project-gallery img {
  width: 100%;
  aspect-ratio: 1 / 1;
  max-height: 34rem;
  object-fit: contain;
}

.project-gallery__zoom-badge {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  display: inline-grid;
  min-width: 2.1rem;
  height: 2.1rem;
  padding: 0 0.45rem;
  place-items: center;
  border: 1px solid rgb(255 255 255 / 0.72);
  border-radius: 999px;
  color: white;
  background: rgb(15 23 42 / 0.72);
  box-shadow: 0 0.45rem 1.2rem rgb(15 23 42 / 0.18);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0;
}

.lightbox {
  width: min(94vw, 72rem);
  max-height: 94vh;
  padding: 2.75rem 1rem 1rem;
  border: 1px solid var(--portfolio-border);
  color: var(--portfolio-text);
  background: var(--c-pageBackground);
}

.lightbox::backdrop {
  background: rgb(0 0 0 / 0.82);
}

.lightbox figure {
  margin: 0;
}

.lightbox__image {
  width: 100%;
  max-height: calc(94vh - 7rem);
  object-fit: contain;
}

.lightbox__close {
  position: absolute;
  top: 0.45rem;
  right: 0.6rem;
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--portfolio-border);
  border-radius: 50%;
  color: var(--portfolio-text);
  background: var(--c-pageBackground);
  cursor: pointer;
}

.publication-figure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.125rem;
  margin: 1.2rem 0;
}

.publication-figure-card {
  margin: 0;
  padding: 0.625rem;
  border: 1px solid var(--portfolio-border);
  border-radius: 0.625rem;
  background: var(--c-pageBackground);
}

.publication-figure-trigger {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

.publication-figure-image {
  display: block;
  width: 100%;
  height: auto;
}

.publication-figure-caption {
  margin-top: 0.45rem;
  font-size: 0.9rem;
}

@media (max-width: 64rem) {
  .home-metric-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 48rem) {
  .career-focus-grid,
  .publication-index-grid,
  .contact-links-grid,
  .project-narrative,
  .publication-detail__heading,
  .publication-card,
  .project-gallery > div {
    grid-template-columns: 1fr;
  }

  .publication-card__preview {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--portfolio-border);
  }

  .publication-card__preview img {
    max-height: 30rem;
  }

  .contact-callout {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (max-width: 30rem) {
  .profile-facts div,
  .contact-facts div,
  .publication-facts div,
  .research-timeline li {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}