:root {
  /* Color Palette - Educational & Professional */
  --color-primary: #004d99; /* Deep SP Blue */
  --color-accent: #e60000; /* Warning/Action Red */
  --color-bg-page: #f8f9fa;
  --color-bg-card: #ffffff;
  --color-text-main: #1a1a1a;
  --color-text-muted: #555555;
  --color-border: #d1d5db;
  --color-status-closed: #2d3748;
  
  /* Typography */
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg-page);
  color: var(--color-text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 4rem);
}

main {
  flex: 1;
  padding-bottom: var(--space-xl);
}

/* Header & Metadata */
.security-header {
  background-color: var(--color-status-closed);
  color: white;
  padding: 0.5rem 0;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: center;
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 100;
}

.restricted-label {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  padding: var(--space-sm) 0;
}

/* School Branding */
.school-brand {
  margin-bottom: var(--space-lg);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: var(--space-sm);
}

.school-brand h1 {
  font-size: 2.5rem;
  color: var(--color-text-main);
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.school-brand h2 {
  font-size: 1.5rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.module-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

/* Section Styling */
section {
  margin-top: var(--space-xl);
  background: var(--color-bg-card);
  padding: var(--space-lg);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

main > section:first-of-type {
  margin-top: 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  border-left: 5px solid var(--color-primary);
  padding-left: var(--space-sm);
}

/* Module Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-sm) var(--space-md);
  align-items: baseline;
}

.info-label {
  font-weight: 700;
  color: var(--color-text-main);
}

.info-value {
  color: var(--color-text-muted);
}

/* Warning Box */
.warning-box {
  background-color: #fff5f5;
  border: 1px solid #feb2b2;
  padding: var(--space-md);
  border-radius: 6px;
  margin-bottom: var(--space-lg);
}

.warning-box strong {
  color: var(--color-accent);
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.warning-box p {
  font-size: 0.9rem;
  color: #c53030;
}

/* Penalty Text */
.penalty {
  color: var(--color-accent);
  font-weight: 600;
  margin-top: var(--space-sm);
}

/* Lists and Tables */
ul, ol {
  margin-left: 1.5rem;
  margin-bottom: var(--space-md);
}

li {
  margin-bottom: 0.5rem;
}

.table-wrapper {
  overflow-x: auto;
  margin: var(--space-md) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-md);
}

th, td {
  border: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  text-align: left;
}

th {
  background-color: #f1f5f9;
  font-weight: 700;
}

/* Marking Scheme Card */
.marking-scheme {
  border-top: 4px solid var(--color-primary);
}

.total-row {
  font-weight: 800;
  font-size: 1.2rem;
  background-color: #f8fafc;
}

/* Footer Navigation */
footer {
  margin-top: var(--space-xl);
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  background: white;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.page-indicator {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .info-grid {
    grid-template-columns: 1fr;
    gap: 0.25rem;
    margin-bottom: var(--space-sm);
  }
  
  .info-label {
    margin-top: 0.75rem;
  }
}

/* Placeholder Utility */
.placeholder-image {
  background: #edf2f7;
  border: 2px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  aspect-ratio: 16/9;
  border-radius: 6px;
  margin: var(--space-md) 0;
}

.placeholder-image::after {
  content: attr(data-label);
  font-weight: 600;
  font-size: 0.85rem;
}