@import url('https://fonts.googleapis.com/css2?family=Spectral:wght@500;600;700;800;900&display=swap');

/* CSS Variables for better maintainability - Greenish High Contrast Theme */
:root {
  --primary-gradient: linear-gradient(135deg, #0d4f3c 0%, #2d5a27 30%, #1a6b54 70%, #0f3a2e 100%);
  --accent-color: #00ff88;
  --accent-secondary: #4ade80;
  --accent-tertiary: #10b981;
  --text-light: rgba(255, 255, 255, 0.95);
  --text-lighter: rgba(255, 255, 255, 1);
  --text-green: #a7f3d0;
  --card-bg: rgba(255, 255, 255, 0.12);
  --card-bg-hover: rgba(255, 255, 255, 0.2);
  --card-bg-dark: rgba(0, 0, 0, 0.3);
  --shadow-light: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-heavy: 0 15px 35px rgba(0, 0, 0, 0.5);
  --shadow-green: 0 10px 25px rgba(16, 185, 129, 0.3);
  --border-green: rgba(16, 185, 129, 0.3);
  --border-green-hover: rgba(16, 185, 129, 0.6);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base styles */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Spectral', serif;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Slide system with improved visibility */
.slide {
  min-height: 100vh;
  display: none;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition-smooth);
  will-change: opacity, transform;
}

.slide.active {
  display: flex;
  opacity: 1;
  transform: translateY(0);
  animation: slideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
0% { 
  opacity: 0; 
  transform: translateY(30px) scale(0.98);
}
100% { 
  opacity: 1; 
  transform: translateY(0) scale(1);
}
}

/* Enhanced gradient background with green theme */
.gradient-bg {
  background: var(--primary-gradient);
  background-attachment: fixed;
  background-size: 400% 400%;
  animation: gradientShift 20s ease infinite;
  position: relative;
}

.gradient-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 70%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(74, 222, 128, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

@keyframes gradientShift {
0% { background-position: 0% 50%; }
25% { background-position: 100% 25%; }
50% { background-position: 100% 75%; }
75% { background-position: 0% 75%; }
100% { background-position: 0% 50%; }
}

/* Improved tech cards with green theme and high contrast */
.tech-card {
  transition: var(--transition-smooth);
  background: var(--card-bg);
  backdrop-filter: blur(15px);
  border: 2px solid var(--border-green);
  border-radius: 1rem;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-light);
}

.tech-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent, rgba(16, 185, 129, 0.05), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tech-card:hover {
  transform: translateY(-10px) scale(1.03);
  box-shadow: var(--shadow-heavy), var(--shadow-green);
  background: var(--card-bg-hover);
  border-color: var(--border-green-hover);
}

.tech-card:hover::before {
  opacity: 1;
}

.previous-slide {
  position: fixed;
  top: 20px;
  left: 20px;
  background: var(--card-bg-dark);
  color: var(--text-lighter);
  padding: 12px 18px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 600;
  z-index: 1000;
  backdrop-filter: blur(15px);
  border: 2px solid var(--border-green);
  box-shadow: var(--shadow-light), var(--shadow-green);
  transition: var(--transition-fast);
}

.previous-slide:hover {
  background: rgba(0, 0, 0, 0.6);
  transform: scale(1.05);
  border-color: var(--accent-color);
  box-shadow: var(--shadow-heavy), 0 0 20px rgba(0, 255, 136, 0.4);
}

.next-slide {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--card-bg-dark);
  color: var(--text-lighter);
  padding: 12px 18px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 600;
  z-index: 1000;
  backdrop-filter: blur(15px);
  border: 2px solid var(--border-green);
  box-shadow: var(--shadow-light), var(--shadow-green);
  transition: var(--transition-fast);
}

.next-slide:hover {
  background: rgba(0, 0, 0, 0.6);
  transform: scale(1.05);
  border-color: var(--accent-color);
  box-shadow: var(--shadow-heavy), 0 0 20px rgba(0, 255, 136, 0.4);
}

/* Enhanced UI elements with green theme and high contrast */
.slide-counter {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--card-bg-dark);
  color: var(--text-lighter);
  padding: 12px 18px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 600;
  z-index: 1000;
  backdrop-filter: blur(15px);
  border: 2px solid var(--border-green);
  box-shadow: var(--shadow-light), var(--shadow-green);
  transition: var(--transition-fast);
}

.slide-counter:hover {
  background: rgba(0, 0, 0, 0.6);
  transform: scale(1.05);
  border-color: var(--accent-color);
  box-shadow: var(--shadow-heavy), 0 0 20px rgba(0, 255, 136, 0.4);
}

.home {
  position: fixed;
  bottom: 20px;
  left: 20px;
  color: var(--text-lighter);
  font-size: 14px;
  font-weight: 600;
  z-index: 1000;
  background: var(--card-bg-dark);
  padding: 12px 18px;
  border-radius: 25px;
  backdrop-filter: blur(15px);
  border: 2px solid var(--border-green);
  box-shadow: var(--shadow-light), var(--shadow-green);
  transition: var(--transition-fast);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.home:hover {
  background: rgba(0, 0, 0, 0.6);
  transform: scale(1.05);
  color: var(--accent-color);
  border-color: var(--accent-color);
  box-shadow: var(--shadow-heavy), 0 0 20px rgba(0, 255, 136, 0.4);
}

/* Enhanced agenda items with green theme and high contrast */
.agenda-item {
  background: var(--card-bg);
  border-radius: 1rem;
  padding: 2rem;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-light);
  border: 2px solid var(--border-green);
  backdrop-filter: blur(15px);
  position: relative;
  overflow: hidden;
}

.agenda-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--accent-color), var(--accent-secondary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.agenda-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-heavy), var(--shadow-green);
  background: var(--card-bg-hover);
  border-color: var(--border-green-hover);
}

.agenda-item:hover::before {
  opacity: 1;
}

.agenda-time {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.agenda-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-lighter);
  line-height: 1.3;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.agenda-description {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-light);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Enhanced CT Principles with green theme and high contrast */
.ct-principle {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: 1rem;
  border-left: 4px solid var(--accent-color);
  border: 2px solid var(--border-green);
  transition: var(--transition-fast);
  box-shadow: var(--shadow-light);
  backdrop-filter: blur(15px);
}

.ct-principle:hover {
  background: var(--card-bg-hover);
  transform: translateX(8px);
  border-color: var(--border-green-hover);
  border-left-color: var(--accent-secondary);
  box-shadow: var(--shadow-heavy), var(--shadow-green);
}

.ct-principle h3 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-lighter);
  display: flex;
  align-items: center;
  gap: 12px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.ct-principle h3::before {
  content: '▶';
  color: var(--accent-color);
  font-size: 1.2rem;
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
}

.ct-principle p {
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: 1rem;
  color: var(--text-light);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.ct-principle ul {
  margin-left: 2rem;
  margin-bottom: 1rem;
}

.ct-principle li {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-green);
  margin-bottom: 0.5rem;
  position: relative;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.ct-principle li::marker {
  color: var(--accent-color);
  font-weight: bold;
}

/* Responsive design improvements */
@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .agenda-item {
    padding: 1.5rem;
  }

  .agenda-title {
    font-size: 1.25rem;
  }

  .ct-principle {
    padding: 1rem;
    margin-bottom: 1.5rem;
  }

  .ct-principle h3 {
    font-size: 1.5rem;
  }

  .slide-counter,
  .home {
    bottom: 15px;
    font-size: 12px;
    padding: 10px 15px;
  }
}

@media (max-width: 480px) {
  .agenda-item {
    padding: 1rem;
  }

  .ct-principle {
    padding: 0.75rem;
  }

  .slide-counter {
    right: 15px;
  }

  .home {
    left: 15px;
  }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus states for better accessibility with green theme */
.tech-card:focus,
.agenda-item:focus,
.ct-principle:focus {
  outline: 3px solid var(--accent-color);
  outline-offset: 3px;
  box-shadow: var(--shadow-heavy), 0 0 20px rgba(0, 255, 136, 0.6);
}

/* Print styles */
@media print {
  .slide-counter,
  .home {
    display: none;
  }

  .slide {
    display: block !important;
    opacity: 1 !important;
    transform: none !important;
    min-height: auto;
    page-break-inside: avoid;
  }
}