styles.css

:root {
  --primary-hue: 260;
  /* Deep Purple */
  --primary-color: hsl(var(--primary-hue), 80%, 65%);
  --secondary-color: hsl(300, 70%, 60%);
  /* Pinkish accent */

  --bg-body: #ffffff;
  --bg-sidebar: #f8f9fa;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;

  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  --code-bg: #1e1e1e;
  --code-text: #d4d4d4;

  --sidebar-width: 280px;
  --header-height: 70px;

  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
  --bg-body: #0b0c15;
  /* Very dark blue-black */
  --bg-sidebar: #11131f;
  --bg-card: #1a1d2d;
  --border-color: #2d3748;

  --text-main: #f1f5f9;
  --text-muted: #cbd5e1;
  --text-light: #64748b;

  --primary-color: hsl(var(--primary-hue), 90%, 75%);
  --secondary-color: hsl(300, 90%, 70%);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1,
h2,
h3,
h4,
.logo,
.header-title {
  font-family: 'Outfit', sans-serif;
}

/* Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  overflow-y: auto;
  transition: transform 0.3s ease;
  z-index: 100;
}

.sidebar-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  font-weight: 800;
  font-size: 1.25rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

.sidebar-nav {
  padding: 32px 24px;
}

.nav-section {
  margin-bottom: 32px;
}

.nav-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin-bottom: 16px;
  font-weight: 700;
}

.nav-links {
  list-style: none;
}

.nav-links li {
  margin-bottom: 6px;
}

.nav-links a {
  display: block;
  padding: 8px 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--primary-color);
  background-color: rgba(var(--primary-hue), 100, 200, 0.05);
  /* Approximate rgba manually */
}

/* Better hover effect using generic opacity */
[data-theme="dark"] .nav-links a:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .nav-links a:hover {
  background-color: rgba(0, 0, 0, 0.05);
}


.nav-links a.active {
  color: var(--primary-color);
  background-color: rgba(120, 100, 255, 0.1);
  font-weight: 600;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-width: 0;
}

/* Top Bar */
.top-bar {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: rgba(var(--bg-body), 0.8);
  /* Falls back if vars dont work in rgba, but standard css handles colors slightly diff. */
  background-color: var(--bg-body);
  /* fallback */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* Note: proper semi-transparent background requires hex or rgb decomposition, for now just using solid bg with opacity relies on browser support or just solid color. Let's make it slightly transparent using data-theme colors if possible. */
[data-theme="dark"] .top-bar {
  background-color: rgba(11, 12, 21, 0.85);
}

[data-theme="light"] .top-bar {
  background-color: rgba(255, 255, 255, 0.85);
}


.header-title {
  font-weight: 600;
  font-size: 1.1rem;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 8px;
  border-radius: 50%;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  color: var(--text-main);
  background-color: var(--border-color);
}

/* Content */
.content-wrapper {
  display: flex;
  max-width: 1400px;
  margin: 0 auto;
  padding: 60px 40px;
}

.doc-content {
  flex: 1;
  min-width: 0;
  padding-right: 60px;
}

.doc-content h2 {
  margin-top: 3rem;
}

.doc-content h3 {
  margin-top: 2.5rem;
}

.doc-content h4 {
  margin-top: 2rem;
}

.doc-content.no-heading-space h2,
.doc-content.no-heading-space h3,
.doc-content.no-heading-space h4 {
  margin-top: 0;
}

.doc-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 32px auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
}

/* Sections */
section {
  padding-bottom: 60px;
  border-bottom: 1px dashed var(--border-color);
  margin-bottom: 60px;
}

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

/* Hero */
.hero-section h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-main) 30%, var(--text-muted));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* On dark mode, make the gradient pop more */
[data-theme="dark"] .hero-section h1 {
  background: linear-gradient(135deg, #fff 30%, #94a3b8);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 1.5rem;
  margin-bottom: 40px;
  font-weight: 500;
}

.gradient-text {
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-block p {
  margin-bottom: 24px;
  font-size: 1.1rem;
  color: var(--text-muted);
}

.text-block ul,
.text-block ol {
  margin-bottom: 24px;
  padding-left: 24px;
  color: var(--text-muted);
}

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

/* Figure Placeholder */
.figure-placeholder {
  margin-top: 40px;
  background-color: var(--bg-sidebar);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.repo-figure {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  margin-bottom: 16px;
}

.caption {
  color: var(--text-light);
  font-size: 0.9rem;
  font-style: italic;
  margin-top: 10px;
}


/* Resources Grid */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.resource-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-decoration: none;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.resource-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.resource-card h3 {
  color: var(--primary-color);
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.resource-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0;
}


/* Keynote Speaker */
.keynote-card {
  margin-top: 32px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: box-shadow 0.3s ease;
}

.keynote-card:hover {
  box-shadow: var(--shadow-lg);
}

.keynote-header {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-bottom: 32px;
}

.keynote-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  border: 4px solid var(--bg-card);
  box-shadow: var(--shadow-md), 0 0 0 2px var(--border-color);
  background: linear-gradient(135deg, var(--bg-sidebar), var(--border-color));
}

.keynote-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* Override .doc-content img defaults */
  margin: 0;
  border-radius: 0;
  box-shadow: none;
  border: none;
}

.keynote-intro h3 {
  font-size: 1.6rem;
  margin-bottom: 4px;
}

.keynote-intro h3 a {
  color: var(--text-main);
  text-decoration: none;
}

.keynote-intro h3 a:hover {
  color: var(--text-main);
  text-decoration: none;
}

.keynote-affiliation {
  color: var(--primary-color);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.keynote-bio {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.keynote-talk {
  border-top: 1px dashed var(--border-color);
  padding-top: 24px;
}

.keynote-talk h4 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.keynote-abstract p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.keynote-abstract ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 16px;
}

.keynote-abstract li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.keynote-abstract li::before {
  content: '•';
  color: var(--primary-color);
  position: absolute;
  left: 0;
  font-weight: bold;
}

@media (max-width: 768px) {
  .keynote-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .keynote-card {
    padding: 24px;
  }
}

/* Timeline / Schedule */
.timeline {
  margin-top: 32px;
  position: relative;
  border-left: 2px solid var(--border-color);
  padding-left: 32px;
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -39px;
  /* adjust based on border width and padding */
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--bg-body);
  border: 2px solid var(--primary-color);
}

.timeline-item .time {
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--secondary-color);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.timeline-item .content h3 {
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.timeline-item .content p {
  margin-bottom: 12px;
  font-size: 1rem;
}

.timeline-item .content ul {
  list-style: none;
  padding-left: 0;
}

.timeline-item .content li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 6px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.timeline-item .content li::before {
  content: '•';
  color: var(--primary-color);
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* Speaker */
.timeline-item .content .speaker {
  font-size: 0.9rem;
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 12px;
}

.timeline-item .content .speaker a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}

.timeline-item .content .speaker a:hover {
  color: var(--secondary-color);
  text-decoration: underline;
}

/* Talk Recording Links */
.talk-recordings {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.talk-video {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 8px;
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--primary-color);
  text-decoration: none;
  background: rgba(124, 92, 232, 0.07);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.talk-video .play-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff;
  flex-shrink: 0;
  transition: background 0.25s ease, color 0.25s ease;
}

.talk-video .play-icon svg {
  width: 11px;
  height: 11px;
  margin-left: 1px;
}

.talk-video:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.talk-video:hover .play-icon {
  background: #fff;
  color: var(--primary-color);
}

.timeline-break {
  margin: 32px 0;
  padding: 12px;
  background-color: var(--bg-sidebar);
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 600;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

/* Organizers Grid */
.organizers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.organizer-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: transform 0.2s;
  height: 100%;
  text-decoration: none;
  color: inherit;
  display: block;
}

.organizer-card:hover {
  border-color: var(--border-color);
  box-shadow: var(--shadow-md);
}

.photo-placeholder {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-sidebar), var(--border-color));
  margin: 0 auto 16px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Initials fallback */
.photo-placeholder::after {
  content: attr(data-initials);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-light);
}

.organizer-card h3 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.organizer-card .affiliation {
  color: var(--primary-color);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.organizer-card .bio {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}


/* On This Page Aside */
.on-this-page {
  width: 240px;
  position: sticky;
  top: 100px;
  align-self: start;
  display: none;
}

@media (min-width: 1024px) {
  .on-this-page {
    display: block;
  }
}

.on-this-page h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.on-this-page ul {
  list-style: none;
  border-left: 2px solid var(--border-color);
}

.on-this-page li a {
  display: block;
  padding: 4px 0 4px 16px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.on-this-page li a:hover {
  color: var(--primary-color);
}

.on-this-page li a.toc-h3 {
  padding-left: 32px;
  font-size: 0.82rem;
}

/* Footer */
.site-footer {
  padding: 40px;
  text-align: center;
  color: var(--text-light);
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

/* Mobile */
/* Ensure menu button is visible on desktop too (for hiddable sidebar) */
#mobile-menu-btn {
  display: block;
  margin-right: 16px;
}

#mobile-close-btn {
  display: none;
}

/* Hiddable Sidebar Logic for Desktop */
body.sidebar-hidden .sidebar {
  transform: translateX(-100%);
}

body.sidebar-hidden .main-content {
  margin-left: 0;
}

@media (min-width: 769px) {

  /* On desktop, close button inside sidebar is not needed if we use the top bar button */
  /* But if we want to closable from inside, we can show it. Let's keep it hidden on desktop for now and rely on top bar button. */
  #mobile-close-btn {
    display: none;
  }
}


@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar {
    transform: translateX(-100%);
    width: 280px;
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 20px 0 50px rgba(0, 0, 0, 0.3);
  }

  .main-content {
    margin-left: 0;
  }

  #mobile-menu-btn {
    display: block;
    margin-right: 16px;
  }

  #mobile-close-btn {
    display: block;
  }

  .top-bar {
    padding: 0 20px;
  }

  /* When on mobile, .sidebar-hidden logic shouldn't interfere with .open logic or vice versa. 
     Mobile uses .open to show. Desktop uses .sidebar-hidden to hide.
     We need to ensure mobile defaults are correct.
     Mobile default: sidebar hidden (transform -100%).
     Desktop default: sidebar shown (transform 0).
  */

  .content-wrapper {
    padding: 40px 20px;
    flex-direction: column;
  }

  .doc-content {
    padding-right: 0;
  }

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

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--text-light);
}

/* Organizer Photos */
.photo-placeholder {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-sidebar), var(--border-color));
  margin: 0 auto 20px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 4px solid var(--bg-card);
  box-shadow: var(--shadow-md), 0 0 0 2px var(--border-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.photo-placeholder:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg), 0 0 0 2px var(--primary-color);
}

.photo-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Sponsors Section */
.sponsors-section {
  padding: 60px 0;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-sidebar);
}

.sponsors-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  padding: 0 20px;
}

.sponsor-logo {
  height: 80px;
  width: auto;
  object-fit: contain;
  /* Removed grayscale to make them colorful by default */
  opacity: 0.9;
  transition: all 0.3s ease;
}

/* User requested same height, so removing specific overrides */
/* .sponsor-logo[alt*="Georgia Tech"] ... */

.sponsor-logo:hover {
  opacity: 1;
  transform: scale(1.1);
}

/* Adjustments for dark mode brightness if needed */
[data-theme="dark"] .sponsor-logo:hover {
  filter: brightness(1.3);
  opacity: 1;
}

/* Citation Section & Code Blocks */
.citation-section {
  margin-top: 60px;
  padding-top: 40px;
}

pre {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 16px 0;
  border: 1px solid var(--border-color);
}


code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

/* Table Styles */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background-color: var(--bg-card);
  border-radius: var(--radius-sm);
  overflow: hidden;
  /* For border radius */
  box-shadow: var(--shadow-sm);
}

th,
td {
  border: 1px solid var(--border-color);
  padding: 12px 16px;
  text-align: left;
}

th {
  background-color: var(--bg-sidebar);
  font-weight: 600;
  color: var(--text-main);
}

tr:nth-child(even) {
  background-color: var(--bg-sidebar);
  /* Use sidebar bg for slight contrast or define a stripe color */
  /* Often sidebar bg is good for subtle stripes in light mode. Let's check dark mode compatibility. */
}

/* Ensure alternating rows are visible in dark mode. 
   var(--bg-sidebar) in dark mode is #11131f, bg-card is #1a1d2d. 
   Sidebar is darker than card? Let's check variables.
   Dark mode: bg-sidebar #11131f, bg-card #1a1d2d. 
   So even rows will be darker. That works for stripes. 
*/

.math {
  font-family: "Times New Roman", Times, serif;
  font-style: italic;
}