:root {
  color-scheme: light;
  --background: #f5f7f3;
  --surface: #ffffff;
  --surface-muted: #eaf0eb;
  --ink: #18211c;
  --muted: #647169;
  --rule: #d2ddd5;
  --accent: #206653;
  --accent-strong: #174d3f;
  --control-border: #b5c4b9;
  --focus: #1d6b56;
  --max-width: 72rem;
  --reading-width: 56rem;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --background: #121813;
  --surface: #1b241e;
  --surface-muted: #202c24;
  --ink: #eef5ef;
  --muted: #a5b4a9;
  --rule: #38483d;
  --accent: #8bd0b5;
  --accent-strong: #b6efd2;
  --control-border: #5b6d60;
  --focus: #c7ffe0;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --background: #121813;
    --surface: #1b241e;
    --surface-muted: #202c24;
    --ink: #eef5ef;
    --muted: #a5b4a9;
    --rule: #38483d;
    --accent: #8bd0b5;
    --accent-strong: #b6efd2;
    --control-border: #5b6d60;
    --focus: #c7ffe0;
  }
}

* {
  box-sizing: border-box;
}

::selection {
  background: var(--accent);
  color: var(--surface);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family:
    Inter,
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  transition:
    background-color 180ms ease,
    color 180ms ease;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
  transition: color 140ms ease;
}

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

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 0.2rem;
}

.shell {
  width: min(calc(100% - 3rem), var(--max-width));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  z-index: 2;
  padding: 0.5rem 0.75rem;
  background: var(--ink);
  color: var(--background);
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 1.15rem;
  border-bottom: 1px solid var(--rule);
  transition: border-color 160ms ease;
}

.wordmark {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  text-decoration: none;
}

.site-nav,
.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-nav {
  align-items: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-nav a,
.paper-links a {
  text-decoration: none;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.github-icon {
  flex: 0 0 auto;
}

.site-nav a:hover,
.paper-links a:hover {
  text-decoration: underline;
}

.theme-toggle,
.action-link {
  border: 1px solid var(--control-border);
  border-radius: 0.2rem;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 0.82rem;
  line-height: 1.3;
  padding: 0.3rem 0.55rem;
  text-decoration: none;
  transition:
    border-color 140ms ease,
    color 140ms ease,
    background-color 140ms ease;
}

.theme-toggle:hover,
.action-link:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
  text-decoration: none;
}

.paper-main {
  padding-block: 6.5rem 7rem;
}

.paper-header {
  max-width: 62rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--rule);
}

.eyebrow,
.abstract h2,
.resources h2,
.citation h2 {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.3;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1,
h2 {
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.paper-header h1 {
  max-width: 60rem;
  margin-bottom: 1.5rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 5vw, 4.25rem);
  font-weight: 700;
  line-height: 1;
}

.byline {
  margin-bottom: 0.25rem;
  color: var(--ink);
}

.contact {
  margin-bottom: 1.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.paper-links {
  gap: 0.65rem 1.35rem;
  margin-bottom: 0;
  color: var(--accent);
  font-size: 0.92rem;
}

.paper-links a {
  padding-block: 0.25rem;
}

.paper-links .primary-link {
  font-weight: 700;
  color: var(--accent);
}

.abstract {
  max-width: var(--reading-width);
  padding-block: 2.75rem 0;
}

.abstract-copy {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.05rem;
  line-height: 1.62;
}

.abstract-copy p {
  margin-bottom: 1.35rem;
}

.abstract-copy p:last-child {
  margin-bottom: 0;
}

.distinction {
  max-width: var(--reading-width);
  margin-top: 4.25rem;
  padding: 1.6rem;
  border: 1px solid var(--rule);
  background: var(--surface);
  transition:
    background-color 180ms ease,
    border-color 180ms ease;
}

.section-intro {
  max-width: 39rem;
}

.section-intro h2 {
  margin-bottom: 0.65rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.55rem, 3vw, 2rem);
}

.section-intro > p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.contrast-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.5rem;
  border: 1px solid var(--rule);
  background: var(--rule);
}

.contrast-card {
  min-height: 15rem;
  padding: 1.4rem;
  background: var(--surface-muted);
  transition: background-color 180ms ease;
}

.contrast-card-accent {
  background: var(--background);
}

.contrast-card-heading {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.contrast-index {
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.contrast-card h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
  line-height: 1.1;
}

.formula-block {
  margin: 1.7rem 0 0.8rem;
  color: var(--accent-strong);
  font-size: 1.2rem;
}

.contrast-card > p:not(.formula-block):not(.contrast-note) {
  max-width: 28rem;
  margin-bottom: 1.3rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.98rem;
  line-height: 1.5;
}

.contrast-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.35;
  text-transform: uppercase;
}

.formula {
  white-space: nowrap;
  font-style: italic;
}

.paper-figure {
  max-width: var(--reading-width);
  margin: 4.25rem 0 0;
  padding-top: 2.25rem;
  border-top: 1px solid var(--rule);
}

.figure-frame {
  padding: 1rem;
  border: 1px solid var(--rule);
  border-radius: 0.25rem;
  background: var(--surface);
  transition:
    background-color 180ms ease,
    border-color 180ms ease;
}

.paper-figure img {
  display: block;
  width: min(100%, 52rem);
  height: auto;
  margin-inline: auto;
}

.paper-figure figcaption {
  max-width: 53rem;
  margin-top: 1rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.92rem;
  line-height: 1.5;
}

.paper-figure figcaption strong {
  font-weight: 700;
}

.resources {
  max-width: var(--reading-width);
  margin-top: 4.25rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}

.resources > p {
  max-width: 48rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.resource-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.5rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.resource-list li {
  display: grid;
  gap: 0.2rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--rule);
}

.resource-list a {
  color: var(--accent);
  font-weight: 700;
}

.resource-list span {
  color: var(--muted);
  font-size: 0.86rem;
}

.citation {
  max-width: var(--reading-width);
  margin-top: 4.25rem;
  padding: 2rem;
  border: 1px solid var(--rule);
  background: var(--surface);
  transition:
    background-color 180ms ease,
    border-color 180ms ease;
}

.citation-text {
  max-width: 48rem;
  margin-bottom: 1rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1rem;
}

.citation-note {
  margin-bottom: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.code-citation {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.citation code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}

.bibtex-block {
  max-width: 100%;
  margin: 0;
  overflow-x: auto;
  padding: 0.9rem 1rem;
  border: 1px solid var(--rule);
  background: var(--surface-muted);
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  line-height: 1.55;
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease;
}

.bibtex-block code {
  font: inherit;
}

.bibtex-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.75rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.copy-fallback {
  position: fixed;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  padding: 0;
  opacity: 0;
  pointer-events: none;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 1.2rem 2.4rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.82rem;
}

.site-footer a {
  color: inherit;
}

@media (max-width: 42rem) {
  .shell {
    width: min(calc(100% - 2rem), var(--max-width));
  }

  .site-header {
    align-items: flex-start;
    padding-block: 1.1rem;
  }

  .site-nav {
    justify-content: flex-end;
    gap: 0.35rem 0.8rem;
  }

  .paper-main {
    padding-block: 4.5rem 5rem;
  }

  .paper-header {
    padding-bottom: 2.25rem;
  }

  .paper-header h1 {
    font-size: clamp(2.1rem, 10vw, 3rem);
  }

  .abstract-copy {
    font-size: 1rem;
  }

  .distinction {
    margin-top: 3.5rem;
    padding: 1.1rem;
  }

  .contrast-grid {
    display: block;
    margin-top: 1.25rem;
    border: 0;
    background: transparent;
  }

  .contrast-card {
    min-height: 0;
    border: 1px solid var(--rule);
  }

  .contrast-card + .contrast-card {
    margin-top: 0.75rem;
  }

  .bibtex-block {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
  }

  .paper-figure,
  .resources,
  .citation {
    margin-top: 3.5rem;
  }

  .resource-list {
    display: block;
  }

  .resource-list li + li {
    margin-top: 1rem;
  }

  .citation {
    padding: 1.25rem;
  }

  .site-footer {
    display: block;
  }

  .site-footer span,
  .site-footer a {
    display: block;
    margin-bottom: 0.25rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}