:root {
  --bg: #f6f5f1;
  --text: #111111;
  --muted: #6f6f6f;
  --rule: #d9d6cf;
  --accent: #2f465f;
  --accent-hover: #1f3348;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 16px;
  line-height: 1.625;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 180ms ease;
}

a:hover,
a:focus-visible {
  color: var(--accent);
}

.shell {
  width: min(calc(100% - 48px), 780px);
  margin: 0 auto;
  padding: 96px 0 112px;
}

.intro {
  display: grid;
  gap: 14px;
}

.name {
  margin: 0;
  font-family: "Instrument Serif", serif;
  font-weight: 400;
  font-size: 3rem;
  line-height: 0.98;
  letter-spacing: -0.01em;
}

.thesis {
  margin: 0;
  font-family: "Instrument Serif", serif;
  font-weight: 400;
  font-size: 1.375rem;
  line-height: 1.35;
  max-width: 32ch;
  letter-spacing: -0.01em;
}

.bio {
  margin: 0;
  max-width: 60ch;
  color: var(--text);
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.95rem;
}

.epigraph {
  margin: 72px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--rule);
  font-family: "Instrument Serif", serif;
  font-style: italic;
  font-size: 1.125rem;
  line-height: 1.45;
  color: var(--muted);
  max-width: 52ch;
}

.epigraph-attribution {
  display: block;
  margin-top: 8px;
  font-family: "IBM Plex Mono", monospace;
  font-style: normal;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

.section {
  margin-top: 72px;
}

.section-label {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 400;
}

.case-studies {
  margin-top: 20px;
  border-top: 1px solid var(--rule);
}

.cs {
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: 24px;
}

.cs.is-open {
  border-bottom-color: var(--accent);
  border-bottom-width: 1px;
}

.cs-button {
  position: relative;
  width: 100%;
  padding: 18px 0;
  border: 0;
  color: inherit;
  background: transparent;
  cursor: pointer;
  text-align: left;
  font: inherit;
}

.cs-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cs-button::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--accent);
  opacity: 0;
  transition: opacity 180ms ease;
}

.cs.is-open .cs-button::after {
  opacity: 1;
}

.cs-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.cs-title {
  margin: 0;
  font-family: "Instrument Serif", serif;
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  transition: color 180ms ease;
}

.cs.is-open .cs-title {
  color: var(--accent);
}

.cs-button:hover .cs-title {
  color: var(--accent);
}

.cs-indicator {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8125rem;
  color: var(--muted);
  flex-shrink: 0;
  transition: color 180ms ease;
}

.cs.is-open .cs-indicator {
  color: var(--accent);
}

.cs-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 180ms ease;
}

.cs.is-open .cs-panel {
  grid-template-rows: 1fr;
}

.cs-panel-inner {
  min-height: 0;
  overflow: hidden;
  padding-left: 24px;
  padding-bottom: 0;
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.cs.is-open .cs-panel-inner {
  padding-bottom: 24px;
  opacity: 1;
  transform: translateY(0);
}

.cs-link {
  margin: 12px 0 0;
}

.cs-summary {
  margin: 12px 0 0;
  max-width: 60ch;
}

.cs-tags {
  margin: 16px 0 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.writing-list {
  padding: 0;
  margin: 20px 0 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.writing-item {
  display: grid;
  gap: 4px;
}

.writing-link {
  width: fit-content;
  font-family: "Instrument Serif", serif;
  font-weight: 400;
  font-size: 1.25rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.writing-meta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.essay-nav {
  margin-bottom: 48px;
  font-size: 0.95rem;
}

.essay-header {
  margin-bottom: 48px;
}

.essay-title {
  margin: 0;
  font-family: "Instrument Serif", serif;
  font-weight: 400;
  font-size: 2.25rem;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.essay-meta {
  margin: 12px 0 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.essay-summary {
  margin: 20px 0 0;
  font-style: italic;
  color: var(--muted);
  max-width: 60ch;
}

.essay-body {
  max-width: 60ch;
}

.essay-body p {
  margin: 0 0 18px;
}

.essay-body p:last-child {
  margin-bottom: 0;
}

.bg-list {
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  margin: 20px 0 0;
}

.bg-item {
  line-height: 1.55;
}

.bg-inline-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.bg-logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.bg-logo-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.bg-inline-logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.bg-inline-logo-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.bg-logo {
  display: inline-block;
  height: 20px;
  width: 20px;
  object-fit: contain;
  margin-right: 6px;
  vertical-align: -0.2em;
  opacity: 0.7;
  filter: grayscale(1);
  transition:
    opacity 180ms ease,
    filter 180ms ease;
}

.bg-inline-logo {
  display: inline-block;
  height: 15px;
  width: 15px;
  object-fit: contain;
  margin: 0 4px 0 2px;
  vertical-align: -0.16em;
  opacity: 0.7;
  filter: grayscale(1);
  transition:
    opacity 180ms ease,
    filter 180ms ease;
}

.bg-item:hover .bg-logo,
.bg-item:hover .bg-inline-logo,
.bg-item:focus-within .bg-logo {
  opacity: 1;
  filter: grayscale(0);
}

.bg-item:focus-within .bg-inline-logo {
  opacity: 1;
  filter: grayscale(0);
}

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

.bg-divider {
  height: 0;
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 8px 0;
}

.patent-list {
  padding: 0;
  margin: 20px 0 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.patent-item {
  display: grid;
  gap: 4px;
}

.patent-link {
  width: fit-content;
}

.patent-meta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.contact-closing {
  margin: 20px 0 0;
  max-width: 44ch;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 16px;
  font-size: 0.95rem;
}

@media (max-width: 600px) {
  .shell {
    width: min(calc(100% - 40px), 780px);
    padding: 56px 0 88px;
  }

  .name {
    font-size: 2.55rem;
  }

  .cs-button {
    min-height: 44px;
  }
}