/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f8f9fa;
}

/* Layout - No sidebar, full width */
.container {
  display: flex;
  min-height: 100vh;
}

/* Main Content - Full width, centered */
.main-content {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.content-header {
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #e9ecef;
  text-align: center;
}

.content-header h1 {
  color: #2c3e50;
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: #6c757d;
  font-size: 1.2rem;
}

/* Overview Section */
.overview-section {
  margin-bottom: 3rem;
  text-align: center;
}

.overview-section h2 {
  color: #2c3e50;
  margin-bottom: 1.5rem;
  font-size: 2rem;
}

.description {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 2rem;
}

.description p {
  margin-bottom: 1rem;
  color: #555;
  font-size: 1.1rem;
}

/* Navigation Cards Grid */
.nav-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.nav-card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: all 0.3s ease;
  border: 1px solid #e9ecef;
}

.nav-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.nav-card-header {
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: white;
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-card-header h3 {
  font-size: 1.4rem;
  margin: 0;
}

.nav-card-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-card-badge.schema {
  background: rgba(46, 204, 113, 0.3);
}

.nav-card-content {
  padding: 1.5rem;
}

.nav-card-content p {
  color: #555;
  margin-bottom: 1rem;
  line-height: 1.6;
}

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

.feature-list li {
  color: #6c757d;
  padding: 0.3rem 0;
  padding-left: 1.2rem;
  position: relative;
  font-size: 0.9rem;
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #3498db;
  font-weight: bold;
}

.nav-card-footer {
  padding: 1rem 1.5rem;
  background: #f8f9fa;
  border-top: 1px solid #e9ecef;
}

.nav-button {
  display: inline-block;
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: white;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.3s ease;
  text-align: center;
  width: 100%;
}

.nav-button:hover {
  background: linear-gradient(135deg, #2980b9, #21618c);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(52, 152, 219, 0.3);
}

/* System Information Section */
.system-info {
  margin-top: 4rem;
  text-align: center;
}

.system-info h2 {
  color: #2c3e50;
  margin-bottom: 2rem;
  font-size: 1.8rem;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.info-card {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: transform 0.3s ease;
}

.info-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.info-icon {
  font-size: 2rem;
  min-width: 60px;
}

.info-content h4 {
  color: #2c3e50;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.info-content p {
  color: #6c757d;
  font-size: 0.9rem;
  margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
  .main-content {
    padding: 1rem;
  }

  .content-header h1 {
    font-size: 2rem;
  }

  .overview-section h2 {
    font-size: 1.5rem;
  }

  .nav-cards-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

  .info-card {
    flex-direction: column;
    text-align: center;
  }

  .info-icon {
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .content-header h1 {
    font-size: 1.5rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .nav-card-header {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.text-muted {
  color: #6c757d !important;
}

.text-center {
  text-align: center !important;
}