/* Import Roboto Slab font */
@import url('https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@300;400;600;700&display=swap');

/* Global reveal settings */
.reveal {
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
  font-size: 32px;
  font-family: 'Roboto Slab', serif;
}

.reveal .slide-background {
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
}

/* Slide container with proper padding */
.reveal .slides section {
  background: white;
  border-radius: 20px;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.4);
  padding: 60px 80px !important;
  text-align: left;
  box-sizing: border-box;
}

/* Title slide - center everything both horizontally and vertically */
.reveal .slides section:has(h1:only-child),
.reveal .slides section:has(h1):not(:has(h2)):not(:has(ul)):not(:has(table)) {
  text-align: center;
  padding: 80px 100px !important;
  display: flex !important;
  flex-direction: column !important;
  justify-content: center !important;
  align-items: center !important;
  min-height: 100%;
}

/* Ensure H1 wrapper centers properly */
.reveal .slides section:has(h1:only-child) > *,
.reveal .slides section:has(h1):not(:has(h2)):not(:has(ul)):not(:has(table)) > * {
  margin: auto 0;
}

/* Headings */
.reveal h1 {
  color: #2c3e50;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  margin: 0;
  font-size: 2.5em;
  line-height: 1.2;
  text-align: center;
  font-family: 'Roboto Slab', serif;
}

/* Subtitle and author styling */
.reveal h1 + p,
.reveal .subtitle {
  text-align: center;
  font-size: 1.2em;
  color: #555;
  margin-top: 30px;
  font-weight: 400;
}

.reveal h2 {
  color: #3498db;
  font-weight: 600;
  border-bottom: 4px solid #3498db;
  padding-bottom: 15px;
  margin-bottom: 40px;
  font-size: 1.8em;
  line-height: 1.3;
}

.reveal h3 {
  color: #2c3e50;
  font-weight: 600;
  margin-bottom: 25px;
  font-size: 1.4em;
}

/* Paragraphs and lists */
.reveal p {
  margin: 20px 0;
  line-height: 1.6;
}

.reveal ul,
.reveal ol {
  margin: 25px 0;
  padding-left: 40px;
}

.reveal li {
  margin: 15px 0;
  line-height: 1.6;
}

/* Tables */
.reveal table {
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
  margin: 30px auto;
  font-size: 0.9em;
  width: auto;
  max-width: 100%;
}

.reveal table thead {
  background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
  color: white;
}

.reveal table th {
  padding: 18px 30px;
  font-weight: 600;
  text-align: left;
  font-size: 1.05em;
}

.reveal table td {
  padding: 16px 30px;
  border-bottom: 1px solid #ecf0f1;
  text-align: left;
}

.reveal table tbody tr:hover {
  background: #f8f9fa;
  transition: background 0.2s ease;
}

.reveal table tbody tr:last-child td {
  border-bottom: none;
}

/* Custom boxes and cards */
.example-box {
  background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
  border-left: 6px solid #667eea;
  padding: 25px 30px;
  border-radius: 10px;
  margin: 30px 0;
  line-height: 1.6;
}

.concept-card {
  background: #f8f9fa;
  border-radius: 12px;
  padding: 35px 40px;
  margin: 30px 0;
  border-left: 6px solid #3498db;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.12);
  line-height: 1.7;
}

/* Grid layouts */
.principle-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin: 40px 0;
}

.principle-item {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.25);
  text-align: center;
  font-size: 1.1em;
  line-height: 1.5;
  transition: transform 0.3s ease;
}

.principle-item:hover {
  transform: translateY(-5px);
}

.framework-box {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  margin: 50px 0;
}

.framework-item {
  background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  padding: 40px 30px;
  border-radius: 15px;
  flex: 1;
  text-align: center;
  color: white;
  font-size: 1.4em;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
  transition: transform 0.3s ease;
}

.framework-item:hover {
  transform: translateY(-8px);
}

/* Highlight */
.highlight {
  background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
  padding: 5px 12px;
  border-radius: 6px;
  font-weight: 600;
  color: #2c3e50;
}

/* Result boxes */
.reveal div[style*="color: #27ae60"] {
  background: linear-gradient(135deg, #27ae6015 0%, #2ecc7115 100%);
  border-left: 6px solid #27ae60;
  padding: 25px 30px;
  border-radius: 10px;
  margin-top: 30px !important;
}

.reveal div[style*="color: #2980b9"] {
  background: linear-gradient(135deg, #2980b915 0%, #3498db15 100%);
  border-left: 6px solid #2980b9;
  padding: 25px 30px;
  border-radius: 10px;
  margin-top: 30px !important;
}

/* Incremental lists */
.reveal .slides section .incremental > * {
  margin: 20px 0;
}

/* Strong text */
.reveal strong {
  color: #2c3e50;
  font-weight: 700;
}

/* Improve slide number positioning */
.reveal .slide-number {
  background: rgba(52, 152, 219, 0.9);
  color: white;
  padding: 8px 15px;
  border-radius: 8px;
  font-weight: 600;
}

/* Better spacing for nested content */
.reveal .concept-card ul,
.reveal .concept-card ol {
  margin: 20px 0 20px 30px;
}

.reveal .concept-card li {
  margin: 12px 0;
}

/* Center alignment helper */
.reveal div[style*="text-align: center"] {
  padding: 40px 0;
}