:root {
  --pico-font-family: "Open Sans", system-ui, -apple-system, sans-serif;
  --ncbi-primary: #0071bc;
  --ncbi-primary-darker: #205493;
  --ncbi-primary-darkest: #112e51;
  --ncbi-primary-light: #e1f3f8;
  --ncbi-gray-dark: #323a45;
  --ncbi-white: #ffffff;
  --btn-fill-bg: var(--ncbi-primary-darkest);
  --btn-fill-border: var(--ncbi-primary-darkest);
  --btn-fill-color: var(--ncbi-white);
  --btn-fill-hover-bg: var(--ncbi-primary-light);
  --btn-fill-hover-border: var(--ncbi-primary);
  --btn-fill-hover-color: var(--ncbi-primary-darkest);
  --pico-background-color: var(--ncbi-white);
  --pico-color: var(--ncbi-gray-dark);
  --pico-primary: var(--ncbi-primary);
  --pico-primary-background: var(--btn-fill-bg);
  --pico-primary-border: var(--btn-fill-border);
  --pico-primary-hover: var(--btn-fill-hover-color);
  --pico-primary-hover-background: var(--btn-fill-hover-bg);
  --pico-primary-hover-border: var(--btn-fill-hover-border);
  --pico-primary-focus: rgba(0, 113, 188, 0.2);
  --pico-primary-inverse: var(--btn-fill-color);
  --pico-muted-color: #464c57;
  --pico-border-color: rgba(17, 46, 81, 0.22);
  --pico-card-background-color: var(--pico-background-color);
  --pico-card-sectioning-background-color: var(--pico-background-color);
  --pico-card-border-color: var(--pico-border-color);
  --pico-card-box-shadow: none;
  --pico-code-background-color: color-mix(
    in srgb,
    var(--pico-color) 6%,
    var(--pico-background-color)
  );
  --pico-mark-background-color: color-mix(
    in srgb,
    var(--pico-primary) 14%,
    var(--pico-background-color)
  );
  --pico-mark-color: var(--pico-color);
  --syntax-comment-color: color-mix(
    in srgb,
    var(--pico-muted-color) 88%,
    var(--pico-background-color)
  );
  --syntax-keyword-color: var(--ncbi-primary);
  --syntax-name-color: var(--ncbi-primary-darker);
  --syntax-string-color: color-mix(
    in srgb,
    var(--ncbi-primary-darkest) 82%,
    var(--ncbi-primary-light)
  );
  --syntax-number-color: color-mix(
    in srgb,
    var(--ncbi-primary-darker) 72%,
    var(--pico-color)
  );
  --syntax-operator-color: color-mix(
    in srgb,
    var(--pico-color) 90%,
    var(--ncbi-primary-darkest)
  );
}

@media (prefers-color-scheme: dark) {
  :root {
    --pico-background-color: #0f1720;
    --pico-color: #e6edf3;
    --btn-fill-bg: var(--ncbi-primary-darker);
    --btn-fill-border: var(--ncbi-primary-darker);
    --btn-fill-color: #e6edf3;
    --btn-fill-hover-bg: var(--ncbi-primary-light);
    --btn-fill-hover-border: var(--ncbi-primary);
    --btn-fill-hover-color: var(--ncbi-primary-darkest);
    --pico-primary: #5dade2;
    --pico-primary-background: var(--btn-fill-bg);
    --pico-primary-border: var(--btn-fill-border);
    --pico-primary-hover: var(--btn-fill-hover-color);
    --pico-primary-hover-background: var(--btn-fill-hover-bg);
    --pico-primary-hover-border: var(--btn-fill-hover-border);
    --pico-primary-focus: rgba(93, 173, 226, 0.25);
    --pico-primary-inverse: var(--btn-fill-color);
    --pico-muted-color: #b6c2cf;
    --pico-border-color: rgba(138, 197, 235, 0.24);
    --pico-card-background-color: var(--pico-background-color);
    --pico-card-sectioning-background-color: var(--pico-background-color);
    --pico-card-border-color: var(--pico-border-color);
    --pico-code-background-color: color-mix(
      in srgb,
      var(--pico-color) 8%,
      var(--pico-background-color)
    );
    --pico-mark-background-color: color-mix(
      in srgb,
      var(--pico-primary) 18%,
      var(--pico-background-color)
    );
    --pico-muted-color: #c2c9d4;
    --syntax-comment-color: color-mix(
      in srgb,
      var(--pico-muted-color) 88%,
      var(--pico-background-color)
    );
    --syntax-keyword-color: #7cc7ff;
    --syntax-name-color: #9fd0ff;
    --syntax-string-color: #c6ecff;
    --syntax-number-color: #86d7f3;
    --syntax-operator-color: #d0d7de;
  }
}

@media (prefers-color-scheme: dark) {
  article.content-page > header hgroup p {
    color: var(--pico-color);
  }

  article.tool-card {
    border-color: rgba(138, 197, 235, 0.28);
  }

  article.tool-card h2 {
    color: #f0f4f8;
  }

  article.tool-card p:not(.tool-links) {
    color: var(--pico-color);
  }
}

body {
  background-color: var(--pico-background-color);
  color: var(--pico-color);
}

article,
section {
  background-color: transparent;
  box-shadow: none;
  color: inherit;
}

.skip-link {
  left: 1rem;
  position: absolute;
  top: -3rem;
}

.skip-link:focus {
  top: 1rem;
  z-index: 20;
}

.site-header {
  background-color: var(--pico-background-color);
  border-bottom: 1px solid var(--pico-border-color);
}

.site-header nav {
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0;
}

.site-header nav ul {
  align-items: center;
  gap: 1.25rem;
  margin: 0;
}

.site-header nav li {
  padding: 0;
}

.site-header nav a[aria-current="page"] {
  color: var(--pico-primary);
}

.site-header nav a .fa-fw,
.site-footer a .fa-fw,
.site-footer a .fa-lg {
  margin-right: 0.35rem;
}

.brand-mark,
.brand-mark:hover {
  align-items: center;
  color: var(--pico-color);
  display: inline-flex;
  gap: 0.55rem;
  text-decoration: none;
}

.brand-logo {
  display: block;
  height: 1.6rem;
  width: auto;
}

.hero-home {
  align-items: center;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 4rem 0 5rem;
  text-align: center;
}

.hero-logo {
  display: block;
  height: auto;
  max-width: min(100%, 14rem);
  width: auto;
}

.hero-home p {
  color: var(--pico-muted-color);
  margin: 0;
  max-width: 36rem;
}

.home-project-link a {
  align-items: center;
  display: inline-flex;
  gap: 0.45rem;
  font-weight: 600;
  margin-bottom: 0;
  width: auto;
}

/* Buttons: dark fill → light hover with dark text (NCBI palette) */
:is(a, button)[role="button"] {
  transition:
    background-color 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease,
    box-shadow 0.15s ease;
}

:is(a, button)[role="button"]:not(.outline) {
  background-color: var(--btn-fill-bg);
  border-color: var(--btn-fill-border);
  color: var(--btn-fill-color);
}

:is(a, button)[role="button"]:not(.outline):hover {
  background-color: var(--btn-fill-hover-bg);
  border-color: var(--btn-fill-hover-border);
  color: var(--btn-fill-hover-color);
}

:is(a, button)[role="button"].outline {
  background-color: transparent;
  border-color: var(--btn-fill-bg);
  color: var(--btn-fill-bg);
}

:is(a, button)[role="button"].outline:hover {
  background-color: var(--btn-fill-hover-bg);
  border-color: var(--btn-fill-hover-border);
  color: var(--btn-fill-hover-color);
}

:is(a, button)[role="button"].outline.secondary {
  border-color: var(--pico-border-color);
  color: var(--pico-color);
}

:is(a, button)[role="button"].outline.secondary:hover {
  background-color: var(--btn-fill-hover-bg);
  border-color: var(--btn-fill-hover-border);
  color: var(--btn-fill-hover-color);
}

article.content-page {
  background: transparent;
  border-radius: 0;
  box-shadow: none;
  max-width: 42rem;
  padding: 3rem 0 4rem;
}

/* Pico gives article > header a tinted band; keep page titles flat */
article.content-page > header {
  background: transparent;
  border-bottom: 0;
  margin-bottom: 1.5rem;
  margin-left: 0;
  margin-right: 0;
  padding: 0;
}

article.content-page > header hgroup {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

article.content-page > header hgroup p {
  color: var(--ncbi-gray-dark);
  margin-bottom: 0;
  opacity: 1;
}

.post-list {
  display: grid;
  gap: 1.25rem;
}

article.post-preview {
  border: 1px solid var(--pico-border-color);
  border-radius: var(--pico-border-radius);
  margin: 0;
  padding: 1.25rem 1.5rem;
}

article.post-preview hgroup {
  margin-bottom: 0.75rem;
}

article.post-preview h2 {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

article.post-preview h2 a {
  color: var(--pico-color);
  text-decoration: none;
}

article.post-preview h2 a:hover {
  color: var(--pico-primary);
  text-decoration: underline;
}

article.post-preview time {
  color: var(--pico-muted-color);
  font-size: 0.9rem;
}

.post-meta {
  align-items: center;
  color: var(--pico-muted-color);
  display: flex;
  flex-wrap: wrap;
  font-size: 0.9rem;
  gap: 0.35rem;
  margin: 0;
  margin-top: 0.5rem;
}

.post-meta time {
  color: inherit;
}

.post-excerpt {
  color: var(--pico-color);
  margin-bottom: 0;
}

.post-read-more {
  margin-bottom: 0;
  margin-top: 1rem;
}

.post-read-more a[role="button"] {
  background-color: var(--btn-fill-bg);
  border-color: var(--btn-fill-border);
  color: var(--btn-fill-color);
  font-weight: 600;
  margin-bottom: 0;
  width: auto;
}

.post-read-more a[role="button"]:hover {
  background-color: var(--btn-fill-hover-bg);
  border-color: var(--btn-fill-hover-border);
  color: var(--btn-fill-hover-color);
}

.content-page pre,
.content-page .highlight {
  background-color: color-mix(
    in srgb,
    var(--pico-color) 7%,
    var(--pico-background-color)
  );
  border: 1px solid var(--pico-border-color);
  border-radius: var(--pico-border-radius);
  margin: 1.25rem 0;
  overflow-x: auto;
  padding: 1rem 1.1rem;
}

.content-page pre code,
.content-page .highlight code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.content-page .highlight pre {
  background: transparent;
  border: 0;
  margin: 0;
  padding: 0;
}

.content-page .highlighter-rouge {
  margin: 1.25rem 0;
}

.content-page .highlight .c,
.content-page .highlight .cm,
.content-page .highlight .c1,
.content-page .highlight .cs {
  color: var(--syntax-comment-color);
  font-style: italic;
}

.content-page .highlight .k,
.content-page .highlight .kd,
.content-page .highlight .kn,
.content-page .highlight .kp,
.content-page .highlight .kr,
.content-page .highlight .kt,
.content-page .highlight .nt {
  color: var(--syntax-keyword-color);
}

.content-page .highlight .na,
.content-page .highlight .nb,
.content-page .highlight .nc,
.content-page .highlight .nf,
.content-page .highlight .nl,
.content-page .highlight .nv {
  color: var(--syntax-name-color);
}

.content-page .highlight .s,
.content-page .highlight .s1,
.content-page .highlight .s2,
.content-page .highlight .sb,
.content-page .highlight .sc,
.content-page .highlight .sd,
.content-page .highlight .se,
.content-page .highlight .sh,
.content-page .highlight .si,
.content-page .highlight .sx {
  color: var(--syntax-string-color);
}

.content-page .highlight .m,
.content-page .highlight .mi,
.content-page .highlight .mf,
.content-page .highlight .mh,
.content-page .highlight .mo,
.content-page .highlight .il {
  color: var(--syntax-number-color);
}

.content-page .highlight .o,
.content-page .highlight .ow {
  color: var(--syntax-operator-color);
}

.post-actions {
  border-top: 1px solid var(--pico-border-color);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  margin-top: 2.5rem;
  padding-top: 1rem;
}

.post-share-links {
  align-items: center;
  color: var(--pico-muted-color);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
}

.post-actions-label {
  color: var(--pico-color);
  font-size: 0.95rem;
  font-weight: 600;
}

.post-action-button[role="button"] {
  align-items: center;
  display: inline-flex;
  font-size: 0.8rem;
  font-weight: 600;
  gap: 0.35rem;
  margin-bottom: 0;
  min-height: auto;
  padding: 0.35rem 0.65rem;
  width: auto;
}

.post-action-button .fa-brands,
.post-action-button .fa-solid {
  font-size: 0.85rem;
}

.post-edit-link {
  margin: 0;
}

article.content-page.tools-page {
  max-width: 52rem;
}

.tool-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
}

article.tool-card {
  border: 1px solid rgba(17, 46, 81, 0.18);
  border-radius: var(--pico-border-radius);
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 1.25rem 1.5rem;
}

article.tool-card h2 {
  color: var(--ncbi-primary-darkest);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

article.tool-card p:not(.tool-links) {
  color: var(--ncbi-gray-dark);
  flex: 1;
  line-height: 1.55;
  margin-bottom: 1rem;
}

.tool-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0;
}

.tool-links a[role="button"] {
  align-items: center;
  background-color: var(--btn-fill-bg);
  border-color: var(--btn-fill-border);
  color: var(--btn-fill-color);
  display: inline-flex;
  font-weight: 600;
  gap: 0.35rem;
  margin-bottom: 0;
  width: auto;
}

.tool-links a[role="button"]:hover {
  background-color: var(--btn-fill-hover-bg);
  border-color: var(--btn-fill-hover-border);
  color: var(--btn-fill-hover-color);
}

.site-footer {
  background-color: var(--pico-background-color);
  border-top: 1px solid var(--pico-border-color);
  margin-top: 3rem;
  padding: 1.5rem 0 3rem;
}

.site-footer small {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-footer a {
  align-items: center;
  display: inline-flex;
  gap: 0.35rem;
  text-decoration: none;
}

.site-footer a:hover .footer-link-label,
.site-footer a:focus-visible .footer-link-label {
  text-decoration: underline;
}

.footer-link-label {
  text-decoration: underline;
  text-underline-offset: 0.1em;
}

@media (max-width: 768px) {
  .hero-home {
    padding-top: 2rem;
  }

  .post-actions {
    align-items: flex-start;
    flex-direction: column;
  }
}