body, td, th {
  font-family: 'Titillium Web', Verdana, Helvetica, sans-serif;
  font-size: 16px;
  font-weight: 400;
}

heading {
  font-family: 'Titillium Web', Verdana, Helvetica, sans-serif;
  font-size: 17px;
  font-weight: 600;
}

strong {
  font-family: 'Titillium Web', Verdana, Helvetica, sans-serif;
  font-size: 16px;
  font-weight: 600;
}

sectionheading {
  color: #000000;
  font-family: 'Titillium Web', Verdana, Helvetica, sans-serif;
  font-size: 28px;
  font-weight: 600;
}

pageheading {
  font-family: 'Titillium Web', Verdana, Helvetica, sans-serif;
  font-size: 38px;
  font-weight: 400;
}

.logo {
  max-width: 1000px;
  height: auto;
}

video {
  border-radius: 16px;
}

a {
  color: #0066cc;
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

a:focus, a:hover {
  color: #1a8cff;
  text-decoration: none;
}

.author-link {
  color: inherit;
  text-decoration: none;
  padding: 1px 4px;
  margin: 0 -2px;
  border-radius: 4px;
  transition: all 0.2s ease-in-out;
}

.title-link {
  color: #000000;
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

.title-link:focus, .title-link:hover {
  color: #1a8cff;
  text-decoration: none;
}

.author-link:hover,
.author-link:focus {
  color: #1a8cff;
  text-decoration: none;
  background-color: #f0f5ff;
}

.primary-author {
  font-weight: 700;
  color: inherit;
}

.highlight-link {
  color: #0066cc;
  text-decoration: none;
  background-color: #f0f5ff;
  border-radius: 3px;
  padding: 4px 4px;
  transition: all 0.2s ease-in-out;
}

.ref-link, .name-link {
  color: #0066cc;
  font-weight: 400;
  text-decoration: none;
  border-radius: 4px;
  transition: color 0.2s ease-in-out;
}

.news-link {
  color: #333333;
  font-size: 16px;
  font-weight: normal;
  text-decoration: none;
  padding: 1px 4px;
  margin: 0 -2px;
  border-radius: 4px;
  transition: all 0.2s ease-in-out;
}

.news-link:hover,
.news-link:focus {
  color: #1a8cff;
  text-decoration: none;
  background-color: #f0f5ff;
}

.social-icon {
  color: #0066cc;
  font-size: 24px;
  margin: 0 8px;
  transition: color 0.2s ease-in-out;
}

.social-icon:hover {
  color: #1a8cff;
}

.paper-links {
  display: flex;
  gap: 2px;
  align-items: center;
  margin-top: 8px;
}

.paper-link {
  color: #666666;
  font-weight: 600;
  text-decoration: none;
  padding: 4px 6px;
  border-radius: 3px;
  transition: background-color 0.2s ease-in-out;
}

.paper-link:hover,
.paper-link:focus {
  color: #666666;
  background-color: #f0f5ff;
}

body.light-mode .news-link,
body.light-mode .news-link:visited {
  color: #333333;
}

body.light-mode .news-link:hover,
body.light-mode .news-link:focus {
  color: #1a8cff;
  text-decoration: none;
  background-color: #f0f5ff;
}

body.light-mode .author-link,
body.light-mode .author-link:visited {
  color: inherit;
}

body.light-mode .author-link:hover,
body.light-mode .author-link:focus {
  color: #1a8cff;
  text-decoration: none;
  background-color: #f0f5ff;
}

body.light-mode .title-link,
body.light-mode .title-link:visited {
  color: #0f0f0f;
}

body.light-mode .paper-link,
body.light-mode .paper-link:visited {
  color: #666666;
}

body.light-mode .paper-link:hover,
body.light-mode .paper-link:focus {
  color: #666666;
  background-color: #f0f5ff;
}

.paper-link-separator {
  color: #666;
  font-weight: 600;
  margin: 0;
  font-size: 0.4em;
  vertical-align: middle;
  line-height: 1;
}

.section-card {
  width: 100%;
  max-width: 800px;
  margin: 0 auto 32px;
  padding: 0 10px;
  box-sizing: border-box;
}

.section-card.about-card {
  margin-bottom: 0;
}

.about-card {
  background-color: transparent;
  border-radius: 0;
  box-shadow: none;
  padding: 10px;
}

.section-card sectionheading {
  display: block;
  margin-bottom: 18px;
}

.about-card sectionheading {
  padding-left: 5px;
}

.section-heading-anchor {
  padding-top: 70px;
  margin-top: -70px;
}

.about-copy p {
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 18px;
  color: #333333;
}

.about-copy .name-link {
  font-size: 16px;
}

.research-focus {
  background-color: #f4f7ff;
  border-left: 4px solid #0066cc;
  padding: 16px 18px 10px;
  border-radius: 10px;
  margin-top: 22px;
  margin-bottom: 10px;
}

.research-focus p {
  margin: 0 0 12px;
  line-height: 1.6;
}

.research-focus p:last-child {
  margin-bottom: 0;
}

.research-focus strong {
  display: inline-block;
  margin-right: 6px;
  color: #004c99;
}

body.dark-mode .about-copy p {
  color: #e0e0e0;
}

body.dark-mode .research-focus {
  background-color: #1e2a3a;
  border-left-color: #4d9dff;
}

body.dark-mode .research-focus strong {
  color: #8ec1ff;
}

.name {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 20px;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 58px;
  display: flex;
  justify-content: center;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(17, 29, 54, 0.05);
  box-shadow: 0 16px 28px -24px rgba(13, 32, 68, 0.3);
  z-index: 1000;
}

.nav-container {
  position: relative;
  width: 100%;
  max-width: 800px;
  padding: 0 2.25%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, #1a8cff, #0066cc);
  color: #ffffff;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.brand-copy {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 24px;
  font-weight: 600;
  color: #1a2238;
  margin-left: 15px;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  position: relative;
  font-size: 17px;
  font-weight: 500;
  color: #334166;
  letter-spacing: 0.02em;
  padding: 8px 0;
  transition: color 0.2s ease-in-out;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(135deg, #1a8cff, #0066cc);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.2s ease;
}

.nav-link:hover,
.nav-link:focus {
  color: #1a8cff;
}

.nav-link:hover::after,
.nav-link:focus::after {
  transform: scaleX(1);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: #334166;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:hover,
.theme-toggle:focus {
  background: rgba(51, 65, 102, 0.08);
  color: #1a8cff;
  border-color: transparent;
}

.theme-toggle i {
  pointer-events: none;
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  padding: 0;
  border-radius: 12px;
  border: 1px solid rgba(51, 65, 102, 0.18);
  background: transparent;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav-toggle span {
  width: 26px;
  height: 3px;
  background: #334166;
  border-radius: 999px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  margin: 0 auto;
}

.nav-toggle:hover,
.nav-toggle:focus {
  border-color: rgba(51, 65, 102, 0.4);
  background: rgba(51, 65, 102, 0.05);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

@media (max-width: 900px) {
  .nav-container {
    padding: 0 2.25%;
    gap: 18px;
  }
}

@media (max-width: 680px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 58px;
    right: 20px;
    left: 20px;
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.97);
    box-shadow: 0 32px 60px -30px rgba(15, 35, 80, 0.45);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    gap: 16px;
  }

  .nav-links.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-link {
    font-size: 18px;
    width: 100%;
  }

  .nav-link::after {
    bottom: 0;
    transform-origin: left;
  }

  .nav-links .theme-toggle {
    margin-top: 8px;
  }
}

section[id] {
  scroll-margin-top: 70px;
}

[id] {
  scroll-margin-top: 70px;
}

body.dark-mode {
  background-color: #121212;
  color: #e0e0e0;
}

body.light-mode {
  background-color: #ffffff;
  color: #0f0f0f;
}

body.dark-mode,
body.dark-mode td,
body.dark-mode th {
  color: #e0e0e0;
}

body.dark-mode heading,
body.dark-mode strong,
body.dark-mode sectionheading,
body.dark-mode pageheading {
  color: #ffffff;
}

body.dark-mode .navbar {
  background-color: rgba(18, 18, 18, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: 0 16px 28px -24px rgba(0, 0, 0, 0.6);
}

body.dark-mode .brand-name {
  color: #eef2ff;
}

body.dark-mode .brand-mark {
  background: linear-gradient(135deg, #3a7bff, #1a4fd4);
}

body.dark-mode .nav-link {
  color: #d0dcff;
}

body.dark-mode .nav-link:hover,
body.dark-mode .nav-link:focus {
  color: #8cb6ff;
}

body.dark-mode .nav-link::after {
  background: linear-gradient(135deg, #8cb6ff, #4f8cff);
}

body.dark-mode .theme-toggle {
  background: transparent;
  border-color: transparent;
  color: #d0dcff;
}

body.dark-mode .theme-toggle:hover,
body.dark-mode .theme-toggle:focus {
  background: rgba(207, 219, 255, 0.1);
  color: #b7d4ff;
}

body.dark-mode .nav-toggle {
  border-color: rgba(207, 219, 255, 0.18);
}

body.dark-mode .nav-toggle span {
  background: #d0dcff;
}

body.dark-mode .highlight-link {
  background-color: #0f2242;
}

body.dark-mode .news-link {
  color: #cccccc;
}

body.dark-mode .news-link:hover,
body.dark-mode .news-link:focus {
  color: #8cb6ff;
  background-color: rgba(116, 164, 255, 0.18);
  text-decoration: none;
}

body.dark-mode .paper-link {
  color: #aaaaaa;
}

body.dark-mode .paper-link:hover {
  background-color: #0f2242;
}

body.dark-mode .paper-link-separator {
  color: #aaaaaa;
}

body.dark-mode .author-link {
  color: inherit;
}

body.dark-mode .author-link:hover,
body.dark-mode .author-link:focus {
  color: #8cb6ff;
  text-decoration: none;
  background-color: rgba(116, 164, 255, 0.2);
}

body.dark-mode a,
body.dark-mode .social-icon,
body.dark-mode .ref-link,
body.dark-mode .name-link,
body.dark-mode .highlight-link {
  color: #1a8cff;
}

body.dark-mode a:focus,
body.dark-mode a:hover,
body.dark-mode .social-icon:hover,
body.dark-mode .title-link:focus,
body.dark-mode .title-link:hover,
body.dark-mode .paper-link:hover {
  color: #6db0ff;
}

body.dark-mode img[src="images/drivestudio.png"] {
  content: url("../images/drivestudio_dark.png");
}

@media (max-width: 680px) {
  body.dark-mode .nav-links {
    background: rgba(18, 18, 18, 0.95);
  }

  body.dark-mode .nav-links .theme-toggle {
    background: rgba(207, 219, 255, 0.1);
  }
}

/* Add dark mode support */
@media (prefers-color-scheme: dark) {
  body:not(.light-mode) {
    background-color: #121212;
    color: #e0e0e0;
  }

  body:not(.light-mode),
  body:not(.light-mode) td,
  body:not(.light-mode) th {
    color: #e0e0e0;
  }

  body:not(.light-mode) heading {
    color: #ffffff;
  }

  body:not(.light-mode) strong {
    color: #ffffff;
  }

  body:not(.light-mode) sectionheading {
    color: #ffffff;
  }

  body:not(.light-mode) pageheading {
    color: #ffffff;
  }

  body:not(.light-mode) .navbar {
    background-color: rgba(18, 18, 18, 0.9);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 16px 28px -24px rgba(0, 0, 0, 0.6);
  }

  body:not(.light-mode) .brand-name {
    color: #eef2ff;
  }

  body:not(.light-mode) .brand-mark {
    background: linear-gradient(135deg, #3a7bff, #1a4fd4);
  }

  body:not(.light-mode) .nav-link {
    color: #d0dcff;
  }

  body:not(.light-mode) .nav-link:hover,
  body:not(.light-mode) .nav-link:focus {
    color: #8cb6ff;
  }

  body:not(.light-mode) .nav-link::after {
    background: linear-gradient(135deg, #8cb6ff, #4f8cff);
  }

  body:not(.light-mode) .theme-toggle {
    background: transparent;
    border-color: transparent;
    color: #d0dcff;
  }

  body:not(.light-mode) .theme-toggle:hover,
  body:not(.light-mode) .theme-toggle:focus {
    background: rgba(207, 219, 255, 0.1);
    color: #b7d4ff;
  }

  body:not(.light-mode) .nav-toggle {
    border-color: rgba(207, 219, 255, 0.18);
  }

  body:not(.light-mode) .nav-toggle span {
    background: #d0dcff;
  }

  body:not(.light-mode) .author-link {
    color: inherit;
  }

  body:not(.light-mode) .author-link:hover,
  body:not(.light-mode) .author-link:focus {
    color: #8cb6ff;
    text-decoration: none;
    background-color: rgba(116, 164, 255, 0.2);
  }

  body:not(.light-mode) .title-link {
    color: #e0e0e0;
  }

  body:not(.light-mode) .highlight-link {
    background-color: #0f2242;
  }

  body:not(.light-mode) .news-link {
    color: #cccccc;
  }

  body:not(.light-mode) .news-link:hover,
  body:not(.light-mode) .news-link:focus {
    color: #8cb6ff;
    text-decoration: none;
    background-color: rgba(116, 164, 255, 0.18);
  }

  body:not(.light-mode) .paper-link {
    color: #aaaaaa;
  }

  body:not(.light-mode) .paper-link:hover {
    background-color: #0f2242;
  }

  body:not(.light-mode) .paper-link-separator {
    color: #aaaaaa;
  }

  /* Keep blue colors consistent across themes */
  body:not(.light-mode) a,
  body:not(.light-mode) .social-icon,
  body:not(.light-mode) .ref-link,
  body:not(.light-mode) .name-link,
  body:not(.light-mode) .highlight-link {
    color: #1a8cff; /* slightly lighter blue for better visibility on dark background */
  }

  body:not(.light-mode) a:focus,
  body:not(.light-mode) a:hover,
  body:not(.light-mode) .social-icon:hover,
  body:not(.light-mode) .title-link:focus,
  body:not(.light-mode) .title-link:hover,
  body:not(.light-mode) .paper-link:hover {
    color: #6db0ff;
  }

  /* Use dark version of drivestudio logo */
  body:not(.light-mode) img[src="images/drivestudio.png"] {
    content: url("../images/drivestudio_dark.png");
  }

  @media (max-width: 680px) {
    body:not(.light-mode) .nav-links {
      background: rgba(18, 18, 18, 0.95);
    }

    body:not(.light-mode) .nav-links .theme-toggle {
      background: rgba(207, 219, 255, 0.1);
    }
  }
}