/* Header: name + menu on one row */
.container {
  margin-top: 3.25rem;
}

.header {
  margin-bottom: 3.75rem;
  padding-bottom: 0;
}

.header-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  column-gap: 2rem;
  row-gap: 1rem;
  padding: 1.75rem 0 2rem;
}

.header-nav {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  justify-self: end;
  gap: 0 0.5rem;
  width: max-content;
  max-width: 100%;
}

.header .site-title {
  margin: 0;
  font-size: 2.75rem;
  font-weight: 500;
  line-height: 1.15;
  flex: 0 1 auto;
}

.header .site-title a {
  color: #333;
  text-decoration: none !important;
}

.header .site-title a:hover {
  color: #3700ff;
  border-bottom: none;
}

.header .nav-main {
  border-top: none;
  padding-top: 0;
  margin: 0;
}

.header .nav-main ul.flat {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  margin: 0;
  padding: 0;
  list-style: none;
}

.header .nav-main li {
  display: inline-block;
  margin: 0 0 0 1.35rem;
  padding: 0;
  list-style: none;
}

.header .nav-main li:first-child {
  margin-left: 0;
}

.header .nav.social {
  border-top: none;
  padding-top: 0;
  margin: 0;
  flex-shrink: 0;
}

.header .nav.social ul.flat {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.header .nav.social li {
  display: inline-block;
  margin: 0 0 0 0.75rem;
  list-style: none;
}

.header-subtitle {
  margin: 0.5em 0 0 0;
  padding-bottom: 0.5rem;
  color: #555;
  font-size: 0.95rem;
  line-height: 1.6;
}

.header .nav-main .menu-link {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  font-size: 1.125rem;
  color: #333;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.header .nav-main .menu-link:hover {
  color: #3700ff;
  border-bottom-color: rgba(55, 0, 255, 0.4);
}

.header .nav-main .menu-link.active {
  color: #3700ff;
  border-bottom-color: #3700ff;
  font-weight: 600;
}

.header .nav-main .menu-link:focus-visible {
  outline: 2px solid rgba(55, 0, 255, 0.25);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Prose rhythm — generous line and paragraph spacing */
.post .markdown p {
  margin: 0 0 1.35em 0;
  line-height: 1.75;
}

.post .markdown p:last-child {
  margin-bottom: 0;
}

.list .page-title {
  margin-bottom: 1.25em;
}

.landing-section {
  margin-top: 28px;
  max-width: 66ch;
}

.landing-title {
  margin: 0 0 1em 0;
  font-size: 1.7rem;
  line-height: 1.3;
}

.landing-subtitle {
  margin: 0 0 1.25em 0;
  color: #666;
  font-size: 0.95rem;
  line-height: 1.75;
}

.landing-intro,
.landing-body {
  margin: 0 0 1.35em 0;
  color: #4b4b4b;
  line-height: 1.75;
}

.landing-list {
  margin: 0 0 1.25em 0;
  padding-left: 1.25em;
  line-height: 1.75;
}

.landing-list li {
  margin-bottom: 0.65em;
  color: #444;
}

.landing-list li:last-child {
  margin-bottom: 0;
}

.landing-links {
  margin-top: 2em;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.landing-link {
  display: inline-block;
  border: 1px solid #d8d8d8;
  border-radius: 999px;
  padding: 6px 12px;
  color: #222;
  font-weight: 500;
}

.landing-link:hover {
  border-color: #3700ff;
}

.books-intro,
.scientists-intro {
  margin: 0 0 1.35em 0;
  color: #4f4f4f;
  font-size: 1rem;
  line-height: 1.75;
  max-width: 68ch;
}

.books-list,
.scientists-list {
  margin-top: 0.5em;
  margin-bottom: 1.35em;
  max-width: 72ch;
}

.scientists-category-title {
  margin: 2em 0 0.75em 0;
  font-size: 1.08rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #242424;
}

.book-line,
.scientist-line {
  margin: 0 0 0.9em 0;
  line-height: 1.75;
  color: #444;
  padding: 0;
}

.book-line + .book-line,
.scientist-line + .scientist-line {
  border-top: 1px solid #efefef;
}

.book-line-title,
.scientist-line-title {
  font-weight: 600;
  color: #000000;
}

/* Ensure title color wins over theme defaults in light mode */
.post .book-line-title,
.post .scientist-line-title {
  color: #000000 !important;
}

.book-line-author,
.scientist-line-author {
  color: #4f4f4f;
  font-weight: 500;
}

.book-line-sep,
.scientist-line-sep {
  color: #6f6f6f;
}

.book-line-desc,
.scientist-line-desc {
  color: #3f3f3f;
}

@media (max-width: 925px) {
  .container {
    margin-top: 0;
  }

  .header {
    margin-bottom: 1.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #eee;
    text-align: center;
  }

  .header-top {
    display: block;
    padding: 0;
  }

  .header .site-title {
    font-size: 2.25rem;
    line-height: 1.2;
    width: 100%;
    margin: 0 0 1.15rem 0;
    text-align: center;
  }

  .header-nav {
    display: flex;
    justify-content: center;
    width: 100%;
    max-width: none;
  }

  .header .nav-main ul.flat {
    flex-wrap: wrap;
    justify-content: center;
    width: auto;
    max-width: 100%;
    row-gap: 0.5rem;
    column-gap: 0;
  }

  .header .nav-main .menu-link {
    white-space: nowrap;
    font-size: 1rem;
  }

  .header .nav-main li {
    margin: 0 0.65rem;
    flex: 0 0 auto;
  }

  .header .nav-main li:first-child {
    margin-left: 0.65rem;
  }

  .header .nav li {
    margin: 0;
    font-size: inherit;
  }

  .books-intro,
  .books-list,
  .scientists-intro,
  .scientists-list {
    max-width: none;
  }

  .scientists-category-title {
    margin-top: 22px;
  }

  .book-line,
  .scientist-line {
    line-height: 1.7;
  }

  .book-line-title,
  .scientist-line-title {
    font-weight: 600;
  }
}

@media (max-width: 560px) {
  .container {
    margin-top: 0;
  }

  .header {
    margin-bottom: 1.25rem;
    padding-bottom: 0.65rem;
  }

  .header .site-title {
    font-size: 2rem;
    margin-bottom: 1rem;
  }

  .header .nav-main li {
    margin: 0 0.5rem;
  }

  .header .nav-main li:first-child {
    margin-left: 0.5rem;
  }

  .header .nav-main .menu-link {
    font-size: 0.9375rem;
    padding-bottom: 3px;
  }

  .landing-title {
    font-size: 1.5rem;
  }

  .landing-links {
    gap: 10px;
    flex-direction: column;
    align-items: stretch;
  }

  .landing-link {
    text-align: center;
  }

  .books-intro,
  .scientists-intro {
    font-size: 0.98rem;
    line-height: 1.7;
  }

  .book-line,
  .scientist-line {
    font-size: 0.95rem;
    margin-bottom: 0.85em;
  }

  .book-line + .book-line,
  .scientist-line + .scientist-line {
    margin-top: 2px;
  }
}

@media (max-width: 380px) {
  .header .site-title {
    font-size: 1.75rem;
  }

  .header .nav-main li {
    margin: 0 0.35rem;
  }

  .header .nav-main li:first-child {
    margin-left: 0.35rem;
  }

  .header .nav-main .menu-link {
    font-size: 0.875rem;
  }
}

/* Dark mode compatibility for custom sections and nav */
html.dark .header .site-title a {
  color: #ddd;
}

html.dark .header .site-title a:hover {
  color: #9375fd;
}

html.dark .header {
  border-bottom-color: #333;
}

html.dark .header-subtitle {
  color: #c7c7c7;
}

html.dark .header .nav-main .menu-link {
  color: #ddd;
}

html.dark .header .nav-main .menu-link:hover {
  color: #9375fd;
  border-bottom-color: rgba(147, 117, 253, 0.5);
}

html.dark .header .nav-main .menu-link.active {
  color: #9375fd;
  border-bottom-color: #9375fd;
}

html.dark .header .nav-main .menu-link:focus-visible {
  outline-color: rgba(147, 117, 253, 0.35);
}

html.dark .landing-intro {
  color: #c7c7c7;
}

html.dark .landing-subtitle,
html.dark .landing-body,
html.dark .landing-list li {
  color: #c7c7c7;
}

html.dark .landing-link {
  color: #e8e8e8;
  border-color: #3a3a3a;
}

html.dark .landing-link:hover {
  border-color: #9375fd;
}

html.dark .books-intro,
html.dark .scientists-intro {
  color: #c7c7c7;
}

html.dark .scientists-category-title {
  color: #e0e0e0;
}

html.dark .book-line,
html.dark .scientist-line {
  color: #d2d2d2;
}

html.dark .book-line + .book-line,
html.dark .scientist-line + .scientist-line {
  border-top-color: #2b2b2b;
}

html.dark .book-line-title,
html.dark .scientist-line-title {
  color: #f1f1f1 !important;
}

html.dark .book-line-author,
html.dark .scientist-line-author {
  color: #cccccc;
}

html.dark .book-line-sep,
html.dark .scientist-line-sep {
  color: #a3a3a3;
}

html.dark .book-line-desc,
html.dark .scientist-line-desc {
  color: #d7d7d7;
}