/* --- Base --- */ 
body { 
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", 
               Roboto, Helvetica, Arial, sans-serif; 
  background: #F5F7F9; /* light TU Delft grey */ 
  margin: 0; 
  padding: 0; 
  color: #1f2933;
} 
 
/* --- Main content container --- */ 
.content { 
  max-width: 1000px; 
  margin: 40px auto; 
  background: #ffffff; 
  padding: 32px 40px; 
  border-radius: 8px; 
  box-shadow: 0 4px 10px rgba(0,0,0,0.08); 
} 

/* --- Headings --- */ 
h1, h2, h3 { 
  color: #005FA8; /* TU Delft dark blue */ 
} 

/* --- Links --- */ 
a { 
  color: #005FA8; 
  text-decoration: none; 
} 

a:hover { 
  text-decoration: underline; 
}

/* --- Instruction block (optional visual emphasis) --- */
.instructions { 
  border-left: 5px solid #00A6D6; /* TU Delft blue */ 
  padding-left: 16px; 
  margin-bottom: 24px; 
} 

/* --- Quiz iframe --- */ 
.iframe-wrapper { 
  width: 100%; 
  margin: 20px 0 30px; 
} 
 
.iframe-wrapper iframe { 
  width: 100%; 
  min-height: 85vh; 
  border: none; 
}