:root {
  --bg-color-light: #ffffff;
  --text-color-light: #333;
  --bg-color-dark: #1e1e1e;
  --text-color-dark: #f0f0f0;
  --accent-color: #2c3e50;
  --accent-hover: #3498db;
}
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  max-width: 1024px;
  margin: 0 auto;
  color: var(--text-color-light);
  background-color: var(--bg-color-light);
  transition: color 0.3s, background-color 0.3s;
  padding-left: 8px;
  padding-right: 4px;
}
p {
  margin: 4px 0;
}

.dark-mode {
  background-color: var(--bg-color-dark);
  color: var(--text-color-dark);
}
.header {
  text-align: center;
  padding: 24px 20px;
  background: #f5f5f5;
  border-radius: 8px;
  margin-bottom: 30px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}
h1 {
  color: var(--accent-color);
  margin-bottom: 12px;
  margin-top: 5px;
  line-height: 1.3;
}
.authors {
  font-size: 1.05em;
  margin: 0 auto 20px;
  text-align: center;
  line-height: 1.6;
  max-width: 780px;
}
.author-line,
.affiliation,
.contact,
.event-details p {
  margin: 4px 0;
}
.authors a {
  color: #1a73e8;
  text-decoration: none;
  font-weight: 600;
}

.authors sup {
  font-size: 16px;
  vertical-align: super;
  margin: 0 2px;
}

.authors em {
  font-size: 14px;
}

.event-details {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(44, 62, 80, 0.15);
}

.event-icon {
  display: inline-block;
  min-width: 24px;
  margin-right: 6px;
}
.abstract {
  scroll-margin-top: 50px;
  background: #f9f9f9;
  padding: 24px 28px;
  border-radius: 8px;
  margin: 20px 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.abstract-content p {
  margin-bottom: 12px;
  text-align: left;
}

.text-highlight {
  background: linear-gradient(120deg, rgba(52, 152, 219, 0.18), rgba(52, 152, 219, 0.35));
  color: var(--accent-color);
  padding: 0.1em 0.35em;
  border-radius: 0.35em;
  font-weight: 600;
}
h2 {
  color: var(--accent-color);
  border-bottom: 2px solid #eee;
  padding-bottom: 10px;
  margin-top: 10px;
  padding-left: 10px;
}

.program-block {
  background: #fafafa;
  border: 1px solid #ececec;
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 14px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.program-block h3 {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--accent-color);
}

.program-block ul {
  margin: 10px 0 0 20px;
  padding-left: 0;
}

.program-block li {
  margin-bottom: 8px;
}

.program-presenter {
  margin-top: 6px;
  margin-bottom: 0;
  font-style: italic;
  color: #4b5563;
}

.dark-mode .program-presenter {
  color: #d1d5db;
}
.content-section {
  margin-top: 10px;
  scroll-margin-top: 50px;
  margin-bottom: 40px;
}

.intro-overview {
  padding: 20px 24px;
  border-radius: 16px;
  background: linear-gradient(135deg, #f8fbff 0%, #eff6fc 100%);
  border: 1px solid #e4edf7;
  box-shadow: 0 8px 22px rgba(44, 62, 80, 0.06);
}

.dark-mode .intro-overview {
  background: linear-gradient(135deg, #2b2b2b 0%, #333a45 100%);
  border-color: #4e5968;
}

.presenters-page-intro {
  margin-bottom: 24px;
}

.presenters-page-title {
  margin: 0 0 8px;
  color: var(--accent-color);
}

.presenters-stack {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.presenter-profile {
  display: grid;
  grid-template-columns: minmax(180px, 220px) 1fr;
  gap: 24px;
  align-items: start;
  padding: 24px;
  background: linear-gradient(135deg, #ffffff 0%, #f6faff 100%);
  border: 1px solid #e4edf7;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(44, 62, 80, 0.08);
  position: relative;
  overflow: hidden;
}

.presenter-profile::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 6px;
  background: linear-gradient(180deg, #3498db 0%, #517599 100%);
}

.presenter-profile:nth-child(even) {
  grid-template-columns: 1fr minmax(180px, 220px);
}

.presenter-profile:nth-child(even) .presenter-portrait {
  order: 2;
}

.presenter-portrait {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.presenter-portrait img {
  width: 100%;
  max-width: 180px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 24px;
  border: 4px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 24px rgba(44, 62, 80, 0.16);
  background: #fff;
}

.presenter-details h3 {
  margin: 0 0 8px;
  color: var(--accent-color);
  font-size: 1.35rem;
}

.presenter-role {
  display: inline-block;
  margin: 0 0 12px;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(52, 152, 219, 0.12);
  color: #517599;
  font-weight: 600;
  font-size: 0.95rem;
}

.presenter-bio p,
.presenter-bio li {
  margin-bottom: 10px;
  color: #4b5563;
  line-height: 1.72;
}

.presenter-bio ol {
  margin: 8px 0 0 20px;
  padding-left: 0;
}

.presenter-bio li {
  margin-bottom: 8px;
}

.presenter-bio a {
  color: #1a73e8;
  font-weight: 600;
}

.presenter-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.presenter-card {
  background: linear-gradient(135deg, #ffffff 0%, #f6faff 100%);
  border: 1px solid #e4edf7;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 8px 22px rgba(44, 62, 80, 0.08);
}

.presenter-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.presenter-card-body {
  padding: 16px;
}

.presenter-card-body h3 {
  margin: 0 0 8px;
  color: var(--accent-color);
  font-size: 1.1rem;
}

.presenter-card-body p {
  margin: 0;
  color: #4b5563;
  line-height: 1.6;
}

.dark-mode .presenter-profile,
.dark-mode .presenter-card {
  background: linear-gradient(135deg, #2b2b2b 0%, #333a45 100%);
  border-color: #4e5968;
}

.dark-mode .presenter-role {
  background: rgba(158, 197, 244, 0.18);
  color: #9ec5f4;
}

.dark-mode .presenter-bio p,
.dark-mode .presenter-bio li,
.dark-mode .presenter-card-body p {
  color: #d8dee9;
}

@media (max-width: 700px) {
  .presenter-profile,
  .presenter-profile:nth-child(even) {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .presenter-profile:nth-child(even) .presenter-portrait {
    order: 0;
  }

  .presenter-portrait {
    justify-content: center;
  }

  .presenter-portrait img {
    max-width: 140px;
  }
}
.social-posts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 10px;
}

.social-posts a {
  display: block;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid #e4edf7;
  box-shadow: 0 8px 22px rgba(44, 62, 80, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.social-posts a:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(44, 62, 80, 0.14);
}

.social-posts img {
  display: block;
  width: 100%;
  height: auto;
}

.dark-mode .social-posts a {
  border-color: #4e5968;
}

.footer {
  text-align: center;
  margin-top: 50px;
  padding: 20px;
  border-top: 1px solid #eee;
  background: #f9f9f9;
}
.nav {
  position: sticky;
  z-index: 1000;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  background: var(--bg-color-light);
  padding: 12px 16px;
  border-bottom: 1px solid #eee;
}
.nav.dark-mode {
  background: var(--bg-color-dark);
}
.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.nav-link:hover {
  color: #3498db;
  background-color: rgba(52, 152, 219, 0.12);
}
.nav-link.active {
  background-color: var(--accent-color);
  color: #fff;
  box-shadow: 0 2px 8px rgba(44, 62, 80, 0.2);
}
.nav-link.active:hover {
  color: #fff;
  background-color: var(--accent-hover);
}
.toggle-btn {
  background-color: #517599;
  color: #fff;
  border: none;
  padding: 5px 15px;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
  margin-left: 8px;
}

.toggle-btn:hover {
  background-color: var(--accent-hover);
}
.buttons {
  display: flex;
  justify-content: center;
  margin-top: 30px;
  flex-wrap: wrap;
}

.buttons a {
  display: inline;
  padding: 10px 20px;
  margin: 2px 10px;
  background-color: #2c3e50;
  color: #fff;
  text-decoration: none;
  border-radius: 5px;
  transition: background-color 0.3s;
}

.buttons a:hover {
  background-color: #3498db;
}

.video-section {
  margin-top: 40px;
}

.video-section h2 {
  text-align: center;
}

.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  overflow: hidden;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.bibtex-section {
  position: relative;
  margin-top: 40px;
}

.bibtex-section pre {
  padding: 20px;
  background-color: #f5f5f5;
  overflow-x: auto;
}

.bibtex-copy-button {
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: #517599;
  color: #fff;
  border: none;
  padding: 5px 10px;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.bibtex-copy-button:hover {
  background-color: #3498db;
}
.carousel-container {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
  margin-bottom: 40px;
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.carousel-slide {
  flex: 0 0 calc(33.333% - 20px);
  margin: 0 10px;
  height: 300px;
}

.carousel-slide img,
.carousel-slide iframe {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
  border: none;
}

.carousel-button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.8);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  z-index: 10;
}

.carousel-button:hover {
  background: rgba(255, 255, 255, 1);
}

.carousel-button.prev {
  left: 10px;
}

.carousel-button.next {
  right: 10px;
}

.carousel-indicators {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
}

.indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ccc;
  border: none;
  cursor: pointer;
  padding: 0;
}

.indicator.active {
  background: #3b82f6;
}
.scrollUpBtn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: none;
  background-color: #517599;
  color: white;
  border: none;
  border-radius: 50%;
  padding: 15px;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  width: 50px;
  height: 50px;
}

.scrollUpBtn:hover {
  background-color: #3498db;
}

.dark-mode .header,
.dark-mode .abstract,
.dark-mode .footer,
.dark-mode .buttons a,
.dark-mode h1,
.dark-mode h2,
.dark-mode .bibtex-section pre {
  background-color: #333;
  color: var(--text-color-dark);
}

.dark-mode .event-details {
  border-color: rgba(255, 255, 255, 0.15);
}
.dark-mode .nav a {
  color: var(--text-color-dark);
}
.dark-mode .buttons a:hover {
  background-color: #3498db;
}
.dark-mode .nav a:hover {
  color: #3498db;
}