* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", sans-serif;
  margin: 0;
  padding: 0;
  background: #fafafa;
  color: #2d3748;
  line-height: 1.7;
}

/* Header with clean gradient background and single watermark */
header {
  background: linear-gradient(135deg, #1e3a8a 0%, #0891b2 100%);
  color: #ffffff;
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  position: relative;
}

/* Single watermark below the logo */
header::before {
  content: '';
  position: absolute;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background-image: url('workshoplogo-removebg-preview.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.08;
  z-index: 0;
  pointer-events: none;
}

header > * {
  position: relative;
  z-index: 1;
}

/* Workshop logo - LARGE and prominent as main header */
.logo-link {
  display: inline-block;
  margin-bottom: 2rem;
}

.workshop-logo {
  max-width: 700px;
  height: auto;
  transition: all 0.3s ease;
  filter: drop-shadow(0 6px 12px rgba(0,0,0,0.3));
}

.workshop-logo:hover {
  transform: scale(1.03) translateY(-3px);
  filter: drop-shadow(0 10px 20px rgba(0,0,0,0.4));
}

/* Responsive logo sizing */
@media (max-width: 768px) {
  .workshop-logo {
    max-width: 350px;
  }
  
  header::before {
    width: 500px;
    height: 500px;
  }
}

header h1 {
  margin: 0;
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

header .subtitle {
  margin: 1rem auto 0;
  font-size: 1.75rem;
  max-width: 1000px;
  opacity: 0.95;
  font-weight: 500;
  line-height: 1.7;
}

header .meta {
  margin-top: 1.5rem;
  font-size: 1.15rem;
  opacity: 0.9;
  font-weight: 500;
}

header .meta strong {
  font-weight: 600;
}

/* Navigation */
nav {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.3);
}

nav a {
  color: #ffffff;
  margin: 0 0.8rem;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.2s;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  display: inline-block;
}

nav a:hover {
  background: rgba(255,255,255,0.15);
}

nav a.active {
  background: rgba(255,255,255,0.25);
  font-weight: 600;
}

/* Main content */
main {
  max-width: 1000px;
  margin: 3rem auto;
  padding: 0 1.5rem 4rem;
}

section {
  background: #ffffff;
  padding: 2.5rem;
  margin-bottom: 2rem;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

h2 {
  margin-top: 0;
  font-size: 1.85rem;
  color: #1e3a8a;
  font-weight: 700;
  border-bottom: 3px solid #0891b2;
  padding-bottom: 0.5rem;
  display: inline-block;
}

h3 {
  font-size: 1.35rem;
  color: #0891b2;
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

p {
  margin: 1rem 0;
}

ul {
  padding-left: 1.5rem;
  margin: 1rem 0;
}

li {
  margin: 0.5rem 0;
}

/* Highlight boxes for important dates */
.dates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.date-box {
  background: linear-gradient(135deg, #eff6ff 0%, #e0f2fe 100%);
  border-left: 4px solid #0891b2;
  padding: 1.25rem;
  border-radius: 6px;
}

.date-box strong {
  display: block;
  color: #1e3a8a;
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.date-box .date {
  color: #0891b2;
  font-weight: 600;
  font-size: 1.1rem;
}

/* Tagline box */
.tagline {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border-left: 4px solid #f59e0b;
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 6px;
  font-style: italic;
  font-size: 1.1rem;
  color: #78350f;
  text-align: center;
  font-weight: 500;
}

/* Organizer cards - Grid Layout */
.organizers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.organizer-card {
  background: #f9fafb;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.3s;
}

.organizer-card:hover {
  border-color: #0891b2;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.organizer-photo-placeholder {
  width: 120px;
  height: 120px;
  background: #e5e7eb;
  border-radius: 50%;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #9ca3af;
  overflow: hidden;
  flex-shrink: 0;
}

.organizer-photo-placeholder img {
  width: 120px !important;
  height: 120px !important;
  max-width: 120px !important;
  max-height: 120px !important;
  min-width: 120px !important;
  min-height: 120px !important;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.organizer-name {
  font-size: 1.15rem;
  font-weight: 600;
  color: #1e3a8a;
  margin-bottom: 0.5rem;
}

.organizer-affiliation {
  font-size: 0.9rem;
  color: #6b7280;
  margin-bottom: 0.75rem;
}

.organizer-email {
  color: #0891b2;
  font-size: 0.9rem;
  text-decoration: none;
  display: block;
  margin-bottom: 0.5rem;
}

.organizer-email:hover {
  text-decoration: underline;
}

.organizer-links {
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

.organizer-links a {
  color: #6b7280;
  text-decoration: none;
}

.organizer-links a:hover {
  color: #0891b2;
  text-decoration: underline;
}

/* Old organizer bio style (kept for backward compatibility) */
.organizer-bio {
  margin-top: 0.5rem;
  color: #4b5563;
  line-height: 1.6;
}

/* Speaker section */
.speaker-box {
  background: #f0fdfa;
  border-left: 4px solid #14b8a6;
  padding: 1.25rem;
  margin: 1rem 0;
  border-radius: 6px;
}

.speaker-box strong {
  color: #0f766e;
}

/* Program committee - compact list */
.pc-list {
  column-count: 2;
  column-gap: 2rem;
  list-style: none;
  padding: 0;
}

.pc-list li {
  break-inside: avoid;
  margin: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.pc-list li:before {
  content: "▸";
  position: absolute;
  left: 0;
  color: #0891b2;
  font-weight: bold;
}

/* Welcome section on homepage */
.welcome-box {
  background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
  border-left: 4px solid #1e3a8a;
  padding: 2rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  text-align: center;
}

.welcome-box h2 {
  border: none;
  display: block;
  margin-bottom: 1rem;
}

.cta-button {
  display: inline-block;
  background: #0891b2;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  margin: 0.5rem;
  transition: background 0.3s;
}

.cta-button:hover {
  background: #0e7490;
}

/* Quick links grid */
.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.quick-link-card {
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  text-decoration: none;
  color: #2d3748;
  transition: all 0.3s;
}

.quick-link-card:hover {
  border-color: #0891b2;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.quick-link-card h3 {
  color: #1e3a8a;
  margin-top: 0;
  font-size: 1.2rem;
}

.quick-link-card p {
  margin: 0.5rem 0 0;
  font-size: 0.95rem;
  color: #6b7280;
}

/* Contact section with clean styled background */
#contact-section {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 2px solid #0891b2;
}

/* Links */
a {
  color: #0891b2;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  text-align: center;
  font-size: 0.9rem;
  color: #6b7280;
  padding: 2rem 1rem 3rem;
  background: #f9fafb;
  border-top: 1px solid #e5e7eb;
}

/* Responsive */
@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }
  
  header .subtitle {
    font-size: 1rem;
  }
  
  section {
    padding: 1.5rem;
  }
  
  .pc-list {
    column-count: 1;
  }
  
  nav a {
    display: inline-block;
    margin: 0.3rem 0.4rem;
  }
  
  .quick-links {
    grid-template-columns: 1fr;
  }
  
  .organizers-grid {
    grid-template-columns: 1fr;
  }
  
}

/* University Logos Footer */
.university-logos {
  margin: 2rem 0 1rem 0;
  padding: 1.5rem 0;
  border-top: 1px solid #e5e7eb;
  text-align: center;
}

.logos-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: nowrap;
}

.university-logo {
  height: 100px;
  max-width: 220px;
  object-fit: contain;
  opacity: 0.8;
  transition: opacity 0.3s ease, transform 0.3s ease;
  filter: grayscale(20%);
}

.university-logo:hover {
  opacity: 1;
  transform: scale(1.05);
  filter: grayscale(0%);
}

/* Responsive logo styles for mobile */
@media (max-width: 768px) {
  .logos-container {
    gap: 1rem;
  }
  
  .university-logo {
    height: 70px;
    max-width: 160px;
  }
}

/* Smooth scroll */
html {
  scroll-behavior: smooth;
}