:root {
  /* Colors - Light Mode */
  --bg-body: #f4f4f5;
  --bg-card: #ffffff;
  --bg-elevated: #e4e4e7;
  --bg-input: #ffffff;
  
  --text-primary: #18181b;
  --text-secondary: #52525b;
  --text-muted: #71717a;
  
  --border-color: #d4d4d8;
  --border-focus: #3b82f6;
  
  /* Accents */
  --primary: #3b82f6; /* Blue */
  --primary-hover: #2563eb;
  --accent: #8b5cf6; /* Purple */
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  
  /* Layout */
  --container-max: 1280px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-md) 0;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  margin: 0 0 var(--space-md) 0;
  color: var(--text-secondary);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-hover);
}

/* Layout */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  width: 100%;
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Components */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  transition: transform 0.2s, border-color 0.2s;
  overflow: hidden;
  height: 100%;
}

.card:hover {
  border-color: #a1a1aa;
  box-shadow: var(--shadow-lg);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-color);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: #e4e4e7;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
}

/* Navigation */
.navbar {
  background: rgba(255, 255, 255, 0.95); /* Increased opacity for better dropdown contrast */
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Hidden Menu Navigation */
.nav-menu-container {
  position: relative;
}

.nav-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-toggle-btn:hover, .nav-toggle-btn.active {
  background: var(--bg-elevated);
  border-color: var(--text-secondary);
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 240px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-sm);
  display: none;
  flex-direction: column;
  gap: 2px;
  z-index: 1000;
}

.nav-dropdown.open {
  display: flex;
  animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-dropdown-item:hover, .nav-dropdown-item.active {
  background: var(--bg-elevated);
  color: var(--primary);
}

.nav-dropdown-divider {
  height: 1px;
  background: var(--border-color);
  margin: 6px 0;
}

/* Deprecated horizontal links styles kept for legacy pages, but updated slightly */
.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

/* Forms */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  transition: all 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* Tables */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table th, .table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-color);
}

.table th {
  background: var(--bg-elevated);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.table tr:hover td {
  background: rgba(0, 0, 0, 0.02);
}

/* Status Badges */
.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.badge-neutral {
  background: rgba(113, 113, 122, 0.1);
  color: var(--text-muted);
  border: 1px solid rgba(113, 113, 122, 0.2);
}

.badge-info {
  background: rgba(59, 130, 246, 0.1);
  color: var(--primary);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.badge-accent {
  background: rgba(139, 92, 246, 0.1);
  color: var(--accent);
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Placeholders */
.placeholder-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
}

.placeholder-icon {
  width: 24px;
  height: 24px;
  background: var(--bg-elevated);
  border-radius: 4px;
  display: inline-block;
  vertical-align: middle;
}

/* Question Paper Wizard */
.questions-list {
  counter-reset: question-counter;
}

.question-item {
  position: relative;
  padding-left: 32px;
}

.question-item::before {
  counter-increment: question-counter;
  content: counter(question-counter) ".";
  position: absolute;
  left: 0;
  top: 0;
  font-weight: 700;
  color: var(--text-muted);
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2px;
}

.tab-link {
  padding: 8px 16px;
  color: var(--text-secondary);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-link:hover {
  color: var(--primary);
}

.tab-link.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* Stats */
.stat-card {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.text-right { text-align: right; }
.w-full { width: 100%; }