/* Modern CSS Reset and Variables */
:root {
  --color-primary: #1a1a2e;
  --color-secondary: #16213e;
  --color-accent: #0f3460;
  --color-highlight: #e94560;
  --color-text: #f5f5f5;
  --color-text-light: #b8b8b8;
  --color-bg: #0f0f1e;
  --color-bg-light: #1a1a2e;
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  width: 100%;
}

/* Header Styles */
.site-header {
  background-color: var(--color-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
}

.nav-brand a {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--color-highlight);
  text-decoration: none;
  transition: var(--transition);
}

.nav-brand a:hover {
  color: var(--color-text);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

.nav-menu a {
  color: var(--color-text);
  text-decoration: none;
  transition: var(--transition);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
}

.nav-menu a:hover {
  color: var(--color-highlight);
  background-color: rgba(233, 69, 96, 0.1);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: var(--spacing-lg) 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  margin-bottom: var(--spacing-lg);
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-highlight) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-md);
}

.hero .cta-button {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-highlight);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: bold;
  transition: var(--transition);
  margin-top: var(--spacing-md);
}

.hero .cta-button:hover {
  background-color: #d63a52;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.3);
}

/* Section Styles */
.section {
  padding: var(--spacing-lg) 0;
}

.previous-years-intro {
  margin-bottom: var(--spacing-lg);
  max-width: 800px;
}

.previous-years-intro p {
  color: var(--color-text-light);
  font-size: 1.1rem;
  line-height: 1.6;
  margin: 0;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  text-align: center;
  color: var(--color-text);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.card {
  background-color: var(--color-bg-light);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-highlight);
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.2);
}

.card h3 {
  color: var(--color-highlight);
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
}

.card p {
  color: var(--color-text-light);
}

/* Sponsors Section */
.sponsors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  align-items: center;
  justify-items: center;
}

.sponsors-placeholder {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--color-text-light);
  font-style: italic;
  padding: var(--spacing-md);
}

.sponsor-item {
  background-color: var(--color-bg-light);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
  transition: var(--transition);
}

.sponsor-item:hover {
  transform: translateY(-4px);
  border-color: var(--color-highlight);
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.2);
}

.sponsor-item img {
  max-width: 100%;
  max-height: 100px;
  object-fit: contain;
}

/* Venue Section */
.venue-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
  align-items: start;
}

.venue-text-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.venue-text-content h3 {
  color: var(--color-highlight);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.venue-text-content p {
  color: var(--color-text-light);
  font-size: 1rem;
  line-height: 1.6;
}

.venue-map {
  width: 100%;
  height: 400px;
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.venue-map iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.organized-by {
  text-align: center;
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
}

.organized-by-text {
  color: var(--color-text-light);
  font-size: 1.1rem;
}

/* Footer */
.site-footer {
  background-color: var(--color-primary);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-md) 0;
  margin-top: var(--spacing-xl);
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: flex-end;
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--color-text-light);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--color-highlight);
}

.social-media-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-media-links a {
  color: var(--color-text-light);
  text-decoration: none;
  transition: var(--transition);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
}

.social-media-links a:hover {
  color: var(--color-highlight);
  background-color: rgba(233, 69, 96, 0.1);
}

/* Previous Years Styles */
.year-section {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.year-section:last-child {
  border-bottom: none;
}

.year-header {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.year-title {
  font-size: 3rem;
  color: var(--color-highlight);
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-highlight) 0%, var(--color-text) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.year-meta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  color: var(--color-text-light);
  font-size: 1.1rem;
}

.year-location,
.year-dates {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.year-description {
  margin-top: var(--spacing-sm);
  color: var(--color-text-light);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 800px;
}

.year-description p {
  margin-bottom: var(--spacing-sm);
}

.year-description p:last-child {
  margin-bottom: 0;
}

.moderator-section {
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.moderator-title {
  font-size: 1.5rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  user-select: none;
  padding: var(--spacing-xs) 0;
  transition: var(--transition);
}

.moderator-title::-webkit-details-marker {
  display: none;
}

.moderator-title::before {
  content: "▶ ";
  display: inline-block;
  margin-right: var(--spacing-xs);
  transition: transform 0.2s ease;
  color: var(--color-highlight);
}

.moderator-section[open] .moderator-title::before {
  transform: rotate(90deg);
}

.moderator-title:hover {
  color: var(--color-highlight);
}

.moderator-card {
  background-color: var(--color-bg-light);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.moderator-name {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
}

.moderator-role {
  color: var(--color-text-light);
  font-size: 1rem;
}

.moderator-bio-details {
  margin-top: var(--spacing-sm);
}

.moderator-bio-summary {
  cursor: pointer;
  color: var(--color-highlight);
  font-weight: 500;
  padding: var(--spacing-xs) 0;
  user-select: none;
}

.moderator-bio-summary:hover {
  color: var(--color-text);
}

.moderator-bio {
  margin-top: var(--spacing-sm);
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

.moderator-bio p,
.moderator-bio ul,
.moderator-bio ol {
  margin-bottom: var(--spacing-sm);
}

.moderator-bio ul,
.moderator-bio ol {
  padding-left: var(--spacing-md);
}

.stats-section {
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--color-bg-light);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.stat-item:hover {
  border-color: var(--color-highlight);
  transform: translateY(-2px);
}

.stat-link {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.stat-link:hover {
  text-decoration: none;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.stat-value {
  font-size: 2rem;
  font-weight: bold;
  color: var(--color-highlight);
}

.stat-value > div {
  font-size: 1.2rem;
  margin-top: var(--spacing-xs);
}

.stat-value > div:first-child {
  margin-top: 0;
}

.talks-section {
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.talks-title {
  font-size: 1.5rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  user-select: none;
  padding: var(--spacing-xs) 0;
  transition: var(--transition);
}

.talks-title::-webkit-details-marker {
  display: none;
}

.talks-title::before {
  content: "▶ ";
  display: inline-block;
  margin-right: var(--spacing-xs);
  transition: transform 0.2s ease;
  color: var(--color-highlight);
}

.talks-section[open] .talks-title::before {
  transform: rotate(90deg);
}

.talks-title:hover {
  color: var(--color-highlight);
}

.schedule-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  align-items: start;
}

.speaker-card {
  background-color: var(--color-bg-light);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.speaker-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-highlight);
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.2);
}

.talk-header {
  margin-bottom: var(--spacing-xs);
}

.talk-title {
  color: var(--color-highlight);
  font-size: 1.5rem;
  margin: 0;
  line-height: 1.3;
}

.talk-time {
  color: var(--color-text-light);
  font-size: 0.85rem;
  margin-bottom: var(--spacing-sm);
  opacity: 0.7;
}

.talk-abstract-wrapper {
  position: relative;
  margin-bottom: var(--spacing-md);
}

.talk-abstract {
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.5;
  max-height: 150px;
  overflow: hidden;
  transition: max-height 0.3s ease;
  position: relative;
}

.talk-abstract.expanded {
  max-height: none;
}

.talk-abstract::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--color-bg-light));
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.talk-abstract.expanded::after {
  opacity: 0;
}

.read-more-btn {
  background: none;
  border: none;
  color: var(--color-highlight);
  cursor: pointer;
  font-size: 0.9rem;
  padding: var(--spacing-xs) 0;
  margin-top: var(--spacing-xs);
  text-align: left;
  transition: var(--transition);
  display: block;
}

.read-more-btn:hover {
  color: var(--color-text);
  text-decoration: underline;
}

.read-more-btn.hidden {
  display: none;
}

.talk-abstract p {
  margin-bottom: var(--spacing-sm);
}

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

.talk-abstract ul,
.talk-abstract ol {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-md);
}

.talk-abstract li {
  margin-bottom: var(--spacing-xs);
}

.talk-abstract li:last-child {
  margin-bottom: 0;
}

.speaker-info {
  margin-bottom: 0;
  padding-bottom: 0;
}

.speaker-name {
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
}

.speaker-role {
  color: var(--color-text-light);
  font-size: 0.95rem;
  font-style: italic;
}

.speaker-bio-details {
  margin-top: var(--spacing-xs);
}

.speaker-bio-summary {
  color: var(--color-text-light);
  font-size: 0.9rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
  padding: var(--spacing-xs) 0;
  transition: var(--transition);
}

.speaker-bio-summary::-webkit-details-marker {
  display: none;
}

.speaker-bio-summary::before {
  content: "▶ ";
  display: inline-block;
  margin-right: var(--spacing-xs);
  transition: transform 0.2s ease;
  color: var(--color-highlight);
}

.speaker-bio-details[open] .speaker-bio-summary::before {
  transform: rotate(90deg);
}

.speaker-bio-summary:hover {
  color: var(--color-text);
}

.speaker-bio {
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.speaker-bio p {
  margin-bottom: var(--spacing-sm);
}

.speaker-bio p:last-child {
  margin-bottom: 0;
}

.speaker-bio ul,
.speaker-bio ol {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-md);
}

.speaker-bio li {
  margin-bottom: var(--spacing-xs);
}

.speaker-bio li:last-child {
  margin-bottom: 0;
}

/* CFP Page Styles */
.cfp-content {
  max-width: 900px;
  margin: 0 auto;
}

.cfp-section {
  margin-bottom: var(--spacing-lg);
}

.cfp-section h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.topics-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.topics-list li {
  padding: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
  background-color: var(--color-bg-light);
  border-left: 3px solid var(--color-highlight);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.topics-list li:hover {
  background-color: var(--color-primary);
  transform: translateX(5px);
}

.dates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.date-item {
  background-color: var(--color-bg-light);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition);
}

.date-item:hover {
  border-color: var(--color-highlight);
  transform: translateY(-2px);
}

.date-item-link {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.date-item-link:hover {
  text-decoration: none;
  color: inherit;
}

.date-value {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
}

.date-value a {
  color: var(--color-text-light);
  text-decoration: none;
  transition: var(--transition);
}

.date-value a:hover {
  color: var(--color-highlight);
  text-decoration: underline;
}

.date-label {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--color-highlight);
  margin-bottom: var(--spacing-xs);
}

.date-note {
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
  opacity: 0.8;
}

.date-note a {
  color: var(--color-highlight);
  text-decoration: none;
  transition: var(--transition);
}

.date-note a:hover {
  text-decoration: underline;
}

.cfp-section .cta-button {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-highlight);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: bold;
  transition: var(--transition);
  margin-top: var(--spacing-md);
  border: none;
  cursor: pointer;
}

.cfp-section .cta-button:hover {
  background-color: #d63a52;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.3);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .nav-menu {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .sponsors-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .stat-value {
    font-size: 1.5rem;
  }

  .venue-content {
    grid-template-columns: 1fr;
  }

  .venue-map {
    height: 300px;
  }

  .site-footer .container {
    flex-direction: column;
    text-align: center;
  }

  .footer-content {
    align-items: center;
    width: 100%;
  }

  .footer-links,
  .social-media-links {
    justify-content: center;
    flex-wrap: wrap;
  }

  .year-title {
    font-size: 2rem;
  }

  .year-meta {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .schedule-grid {
    grid-template-columns: 1fr;
  }

}