/* ==========================================================================
   DESIGN SYSTEM, TOKENS & VARIABLE DECLARATIONS
   ========================================================================== */
:root {
  /* Fonts */
  --font-headings: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Color Palette (Light Theme) */
  --bg-main: #f3f6fc;
  --bg-card: #ffffff;
  --bg-hover: #f8fafc;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-on-primary: #ffffff;
  
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-glow: rgba(37, 99, 235, 0.15);
  --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  
  --accent-cyan: #06b6d4;
  --accent-cyan-light: #ecfeff;
  
  --success: #10b981;
  --success-light: #ecfdf5;
  --success-glow: rgba(16, 185, 129, 0.15);
  
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  
  --danger: #ef4444;
  --danger-light: #fefeef;
  --danger-glow: rgba(239, 68, 68, 0.15);
  
  --border: #e2e8f0;
  --border-focus: #3b82f6;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 20px 0 rgba(37, 99, 235, 0.1);
  
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --border-radius-pill: 9999px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

  --nav-height: 72px;
  --sidebar-width: 280px;
}

/* Color Palette (Dark Theme Overrides) */
body.dark-theme {
  --bg-main: #090d16;
  --bg-card: #111827;
  --bg-hover: #1f2937;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-light: #1e293b;
  --primary-glow: rgba(59, 130, 246, 0.25);
  --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  
  --accent-cyan: #22d3ee;
  --accent-cyan-light: #162e3d;
  
  --success: #34d399;
  --success-light: #064e3b;
  --success-glow: rgba(52, 211, 153, 0.25);
  
  --danger: #f87171;
  --danger-light: #7f1d1d;
  --danger-glow: rgba(248, 113, 113, 0.25);
  
  --border: #1f2937;
  --border-focus: #3b82f6;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px 0 rgba(59, 130, 246, 0.15);
}

/* ==========================================================================
   RESET & GLOBAL BASE STYLES
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

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

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  outline: none;
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headings);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

h1 { font-size: 2.5rem; letter-spacing: -0.025em; }
h2 { font-size: 2rem; letter-spacing: -0.02em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.2rem; }

p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* ==========================================================================
   UTILITY LAYOUT & WRAPPERS
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal), background-color var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }
.mt-3 { margin-top: 1rem; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }

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

.hidden, .admin-onlyhidden {
  display: none !important;
}

/* ==========================================================================
   BUTTONS & ACCENTS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  gap: 8px;
}

.btn-primary {
  background: var(--primary-gradient);
  color: var(--text-on-primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background: var(--primary-gradient);
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border);
  color: var(--text-main);
}

.btn-outline:hover {
  background-color: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.btn-success {
  background-color: var(--success);
  color: var(--text-on-primary);
}

.btn-success:hover {
  background-color: #059669;
}

.btn-text {
  background: none;
  border: none;
  color: var(--primary);
  padding: 0;
  font-weight: 600;
}

.btn-text:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background-color: var(--border);
  color: var(--text-main);
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.1rem;
  border-radius: var(--border-radius-md);
}

/* Icon Styles */
.icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.icon-lg {
  width: 28px;
  height: 28px;
}

/* Gradients & Animations */
.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn var(--transition-normal) forwards;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 4px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--border-radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-easy { background-color: var(--success-light); color: var(--success); }
.badge-medium { background-color: var(--warning-light); color: var(--warning); }
.badge-hard { background-color: var(--danger-light); color: var(--danger); }
.badge-category { background-color: var(--primary-light); color: var(--primary); }

/* ==========================================================================
   NAVIGATION BAR
   ========================================================================== */
.navbar {
  height: var(--nav-height);
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.navbar-container {
  height: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-headings);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
}

.logo-accent {
  color: var(--primary);
}

.logo-tld {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-link {
  color: var(--text-muted);
  font-weight: 500;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

#auth-nav-container {
  display: flex;
  gap: 12px;
}

#user-profile-menu {
  display: flex;
  align-items: center;
  gap: 16px;
}

.profile-nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--primary);
  color: var(--text-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.nav-username {
  font-weight: 600;
  font-size: 0.9rem;
}

/* Mobile drawer styles */
.mobile-only {
  display: none;
}

.mobile-drawer {
  display: none;
  position: absolute;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  box-shadow: var(--shadow-lg);
  flex-direction: column;
  gap: 16px;
  z-index: 99;
}

.mobile-nav-link {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 0;
}

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

/* ==========================================================================
   VIEW ENGINE (TAB SYSTEMS)
   ========================================================================== */
.view {
  display: none;
}

.view.active-view {
  display: block;
}

.main-content {
  flex-grow: 1;
  padding-top: 40px;
  padding-bottom: 80px;
}

/* ==========================================================================
   1. HERO SECTION
   ========================================================================== */
.hero-section {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 60px;
}

.hero-badge {
  display: inline-block;
  background-color: var(--primary-light);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: var(--border-radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3rem;
  line-height: 1.15;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  gap: 32px;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: var(--font-headings);
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-section .divider {
  width: 1px;
  background-color: var(--border);
  align-self: stretch;
}

/* Interactive Card in Hero */
.hero-visual {
  perspective: 1000px;
}

.interactive-hero-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.interactive-hero-card:hover {
  transform: translateY(-8px) rotateY(-3deg) rotateX(3deg);
  box-shadow: 0 20px 40px rgba(0,0,0,0.1), var(--shadow-glow);
}

.interactive-hero-card .card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.card-badge {
  background-color: var(--accent-cyan-light);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--border-radius-pill);
}

.star-bookmark {
  color: var(--text-muted);
}

.star-bookmark.active {
  color: var(--warning);
  fill: var(--warning);
}

.question-text {
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 24px;
}

.options-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-btn {
  background-color: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 14px 20px;
  text-align: left;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.option-btn:hover {
  background-color: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateX(4px);
}

.option-btn.correct {
  background-color: var(--success-light) !important;
  border-color: var(--success) !important;
  color: var(--success) !important;
  font-weight: 600;
}

.option-btn.incorrect {
  background-color: var(--danger-light) !important;
  border-color: var(--danger) !important;
  color: var(--danger) !important;
}

.answer-explanation {
  margin-top: 20px;
  padding: 16px;
  background-color: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  font-size: 0.9rem;
  color: var(--text-main);
  animation: fadeIn var(--transition-normal) forwards;
}

/* ==========================================================================
   2. SEARCH SECTION
   ========================================================================== */
.search-section {
  padding: 40px;
  margin-bottom: 60px;
  background-color: var(--bg-card);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.search-section::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  z-index: 1;
  pointer-events: none;
}

.section-desc {
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 24px;
}

.search-bar-wrapper {
  display: flex;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto 20px auto;
  position: relative;
  z-index: 2;
}

.search-input-group {
  flex-grow: 1;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-input-group input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  background-color: var(--bg-main);
  transition: all var(--transition-fast);
}

.search-input-group input:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.quick-tags {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.85rem;
}

.quick-tag-label {
  color: var(--text-muted);
  font-weight: 500;
}

.tag-link {
  background-color: var(--bg-main);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: var(--border-radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tag-link:hover {
  background-color: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

/* ==========================================================================
   3. CATEGORIES SECTION
   ========================================================================== */
.section-container {
  margin-bottom: 60px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 28px;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.category-card {
  cursor: pointer;
}

.category-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.category-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--primary);
  background-color: var(--primary-light);
}

/* Assign unique gradient glow on category icon cards */
.category-card:nth-child(2n) .category-icon-wrapper {
  color: var(--accent-cyan);
  background-color: var(--accent-cyan-light);
}

.category-title {
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 6px;
}

.category-stats-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   4. FEATURED QUIZZES SECTION
   ========================================================================== */
.quizzes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.quiz-card {
  display: flex;
  flex-direction: column;
}

.quiz-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.quiz-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.quiz-stats-row {
  display: flex;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.quiz-stat {
  display: flex;
  align-items: center;
  gap: 6px;
}

.quiz-card .btn {
  margin-top: auto;
}

/* ==========================================================================
   5. LATEST MCQS SECTION & MCQ CARD RENDERING
   ========================================================================== */
.mcqs-list-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.mcq-card {
  position: relative;
}

.mcq-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.mcq-question {
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 18px;
}

.mcq-options-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-bottom: 18px;
}

.mcq-option {
  width: 100%;
  padding: 10px 16px;
  border-radius: var(--border-radius-sm);
  background-color: var(--bg-main);
  border: 1px solid var(--border);
  text-align: left;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mcq-option:hover {
  background-color: var(--primary-light);
  border-color: var(--primary);
}

.mcq-option.correct {
  background-color: var(--success-light) !important;
  border-color: var(--success) !important;
  color: var(--success) !important;
}

.mcq-option.incorrect {
  background-color: var(--danger-light) !important;
  border-color: var(--danger) !important;
  color: var(--danger) !important;
}

.mcq-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.explanation-reveal {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: var(--border-radius-sm);
  background-color: var(--bg-main);
  border-left: 3px solid var(--primary);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* ==========================================================================
   6. BROWSER SIDEBAR FILTERS LAYOUT
   ========================================================================== */
.browser-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 32px;
}

.browser-sidebar {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 24px;
  align-self: flex-start;
  position: sticky;
  top: 100px;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.filter-group {
  margin-bottom: 24px;
}

.filter-title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 12px;
}

.filter-options-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.checkbox-label:hover {
  color: var(--text-main);
}

.checkbox-label input {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid var(--border);
  accent-color: var(--primary);
}

/* Browser main list */
.browser-search-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.search-stats {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.mcqs-list-stack {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ==========================================================================
   7. QUIZ LIST VIEW SPECIFICS
   ========================================================================== */
.quiz-filter-bar {
  padding: 24px;
  margin-bottom: 32px;
}

.quiz-category-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.quiz-category-tags .btn {
  padding: 6px 16px;
  font-size: 0.85rem;
}

/* ==========================================================================
   8. ACTIVE QUIZ RUNNER INTERFACE
   ========================================================================== */
.quiz-runner-layout {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  gap: 20px;
}

.quiz-running-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-top: 4px;
}

.quiz-timer-box {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
  font-size: 1.15rem;
  padding: 10px 16px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border-focus);
}

.quiz-progress-bar-container {
  background-color: var(--border);
  height: 8px;
  border-radius: var(--border-radius-pill);
  position: relative;
  margin-bottom: 32px;
}

.progress-bar-fill {
  background: var(--primary-gradient);
  height: 100%;
  border-radius: var(--border-radius-pill);
  transition: width var(--transition-normal);
}

.progress-text {
  position: absolute;
  right: 0;
  top: 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.quiz-question-box {
  margin-bottom: 32px;
}

.quiz-question-box .question-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.question-number-badge {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
  padding: 6px 12px;
  border-radius: var(--border-radius-md);
  font-size: 0.95rem;
  flex-shrink: 0;
}

.quiz-question-text {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-main);
}

.quiz-options-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-option-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 16px 24px;
  text-align: left;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quiz-option-btn:hover {
  background-color: var(--bg-main);
  border-color: var(--text-muted);
}

.quiz-option-btn.selected {
  background-color: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary);
}

.quiz-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}

/* ==========================================================================
   9. QUIZ RESULTS BOARD
   ========================================================================== */
.result-layout {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px;
}

.result-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 40px;
}

.score-circle-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.score-circle {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: var(--primary-gradient);
  color: var(--text-on-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.3);
}

.score-percent {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--font-headings);
}

.score-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.9;
}

.result-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.result-desc {
  font-size: 1.1rem;
  margin-bottom: 32px;
}

.result-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.result-stat-box {
  padding: 16px;
  background-color: var(--bg-main);
  text-align: center;
}

.result-stat-box .stat-val {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-headings);
}

.result-stat-box .stat-val.correct { color: var(--success); }
.result-stat-box .stat-val.wrong { color: var(--danger); }
.result-stat-box .stat-val.skipped { color: var(--text-muted); }
.result-stat-box .stat-val.time { color: var(--accent-cyan); }

.result-stat-box .stat-lbl {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.result-action-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Question Review details */
.result-review-section {
  text-align: left;
}

.review-questions-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 20px;
}

.review-question-card {
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 20px;
}

.review-question-card.status-correct {
  border-left: 4px solid var(--success);
}

.review-question-card.status-incorrect {
  border-left: 4px solid var(--danger);
}

.review-question-card.status-skipped {
  border-left: 4px solid var(--text-muted);
}

.review-header-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--border-radius-pill);
  margin-bottom: 12px;
}

.review-header-badge.correct { background-color: var(--success-light); color: var(--success); }
.review-header-badge.incorrect { background-color: var(--danger-light); color: var(--danger); }
.review-header-badge.skipped { background-color: var(--border); color: var(--text-muted); }

.review-opts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin: 16px 0;
}

.review-opt {
  padding: 10px 16px;
  border-radius: var(--border-radius-sm);
  background-color: var(--bg-main);
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

.review-opt.user-choice-correct {
  border-color: var(--success);
  background-color: var(--success-light);
  color: var(--success);
  font-weight: 600;
}

.review-opt.user-choice-incorrect {
  border-color: var(--danger);
  background-color: var(--danger-light);
  color: var(--danger);
}

.review-opt.correct-answer-target {
  border-color: var(--success);
  background-color: var(--success-light);
  color: var(--success);
}

/* ==========================================================================
   10. USER PROFILE VIEW
   ========================================================================== */
.profile-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
}

.profile-sidebar {
  padding: 32px;
  align-self: flex-start;
}

.profile-header-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 24px;
}

.profile-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--primary-gradient);
  color: var(--text-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-family: var(--font-headings);
  font-weight: 800;
  margin-bottom: 16px;
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.2);
}

.user-role-badge {
  display: inline-block;
  background-color: var(--accent-cyan-light);
  color: var(--accent-cyan);
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--border-radius-pill);
  font-size: 0.75rem;
  margin-top: 8px;
}

.profile-sidebar-stats {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.side-stat-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
}

.side-stat-row span { color: var(--text-muted); }
.side-stat-row strong { color: var(--text-main); font-weight: 600; }

/* Profile tabs list */
.profile-tabs-header {
  display: flex;
  padding: 10px;
  gap: 12px;
  margin-bottom: 24px;
}

.tab-btn {
  background: none;
  border: none;
  padding: 10px 20px;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-main);
  background-color: var(--bg-main);
}

.tab-btn.active {
  background-color: var(--primary-light);
  color: var(--primary);
}

.profile-tab-content {
  animation: fadeIn var(--transition-normal) forwards;
}

/* Performance tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

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

.data-table th, .data-table td {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.data-table th {
  font-weight: 600;
  color: var(--text-muted);
  background-color: var(--bg-hover);
}

.data-table tbody tr:hover {
  background-color: var(--bg-hover);
}

/* ==========================================================================
   11. ADMIN DASHBOARD & FORMS
   ========================================================================== */
.admin-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
}

.admin-sidebar {
  padding: 24px;
  align-self: flex-start;
}

.admin-menu-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 24px;
}

.admin-menu-btn {
  background: none;
  border: none;
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.admin-menu-btn:hover {
  color: var(--text-main);
  background-color: var(--bg-main);
}

.admin-menu-btn.active {
  background-color: var(--primary-light);
  color: var(--primary);
}

/* Form Styles */
.form-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
}

.form-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--border-radius-sm);
  background-color: var(--bg-main);
  transition: all var(--transition-fast);
  color: var(--text-main);
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

.col-12 { grid-column: span 12; }
.col-8 { grid-column: span 8; }
.col-6 { grid-column: span 6; }
.col-4 { grid-column: span 4; }

/* Admin custom multi-select box */
.question-multi-select-list {
  border: 1px solid var(--border);
  border-radius: var(--border-radius-sm);
  max-height: 240px;
  overflow-y: auto;
  padding: 12px;
  background-color: var(--bg-main);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.multi-select-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
}

.multi-select-item input {
  width: 16px;
  height: 16px;
  margin-top: 2px;
}

/* Manage Toggle Tab buttons */
.admin-manage-toggles {
  display: flex;
  gap: 8px;
}

.admin-manage-toggles .btn {
  padding: 6px 12px;
  font-size: 0.85rem;
}

.active-toggle {
  background-color: var(--primary);
  color: var(--text-on-primary) !important;
  border-color: var(--primary);
}

/* ==========================================================================
   12. SUCCESS/ERROR TOAST ALERTS
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
}

.toast {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 14px 20px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 300px;
  max-width: 450px;
  animation: slideInLeft 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  position: relative;
  overflow: hidden;
}

@keyframes slideInLeft {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.toast::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
}

.toast.toast-success::before { background-color: var(--success); }
.toast.toast-error::before { background-color: var(--danger); }
.toast.toast-info::before { background-color: var(--primary); }

.toast-message {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-main);
}

.toast-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

/* ==========================================================================
   13. LOGIN/REGISTER MODALS
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(9, 13, 22, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  animation: fadeInModal 0.2s ease-out forwards;
}

@keyframes fadeInModal {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-container {
  width: 100%;
  max-width: 480px;
  position: relative;
  padding: 40px;
  animation: scaleUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes scaleUp {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
}

.modal-header {
  margin-bottom: 24px;
}

.modal-header h2 {
  font-size: 1.75rem;
}

.modal-footer {
  margin-top: 24px;
  font-size: 0.85rem;
  text-align: center;
  color: var(--text-muted);
}

.modal-footer a {
  font-weight: 600;
}

.admin-hint {
  margin-top: 14px;
  padding: 10px;
  background-color: var(--primary-light);
  border-radius: var(--border-radius-sm);
  color: var(--text-main);
  font-size: 0.8rem;
  line-height: 1.4;
  border-left: 2px solid var(--primary);
}

/* ==========================================================================
   14. STATIC INFO & CONTACT STYLING
   ========================================================================== */
.static-content-box {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px;
}

.static-content-box h2 {
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.static-content-box p {
  font-size: 1.05rem;
  margin-bottom: 20px;
}

.static-content-box ul {
  list-style-type: disc;
  padding-left: 24px;
  margin-bottom: 20px;
}

.static-content-box li {
  margin-bottom: 8px;
}

/* ==========================================================================
   15. FOOTER
   ========================================================================== */
.footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border);
  padding-top: 60px;
  padding-bottom: 30px;
  margin-top: auto;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-logo {
  font-family: var(--font-headings);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
}

.brand-desc {
  font-size: 0.95rem;
  line-height: 1.6;
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-link {
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-link:hover {
  background-color: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.social-icon {
  width: 18px;
  height: 18px;
}

.footer-links-group h4 {
  font-size: 1.05rem;
  margin-bottom: 20px;
  font-weight: 700;
  color: var(--text-main);
}

.footer-links-group ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links-group a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.footer-links-group a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   16. RESPONSIVE MEDIA BREAKPOINTS
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-visual {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
  }

  .browser-layout {
    grid-template-columns: 1fr;
  }

  .browser-sidebar {
    position: static;
    width: 100%;
  }

  .profile-layout {
    grid-template-columns: 1fr;
  }

  .profile-sidebar {
    width: 100%;
  }

  .admin-layout {
    grid-template-columns: 1fr;
  }

  .admin-sidebar {
    width: 100%;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.8rem; }

  .mobile-only {
    display: flex;
  }

  .nav-links {
    display: none;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 16px;
  }
  
  .hero-section .divider {
    display: none;
  }

  .mcqs-list-grid {
    grid-template-columns: 1fr;
  }

  .result-stats-row {
    grid-template-columns: 1fr 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }

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

  .col-12, .col-8, .col-6, .col-4 {
    grid-column: span 12;
  }
}

@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .hero-buttons .btn {
    width: 100%;
  }

  .interactive-hero-card {
    padding: 20px;
  }

  .search-section {
    padding: 20px;
  }

  .search-bar-wrapper {
    flex-direction: column;
  }

  .search-bar-wrapper .btn {
    width: 100%;
  }

  .modal-container {
    padding: 20px;
  }
}