@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700;800&display=swap');

/* ==========================================================================
   1. CSS Variables & Theming
   ========================================================================== */
:root {
  /* Brand Colors */
  --clr-primary: #2563EB;
  --clr-primary-hover: #1D4ED8;
  --clr-primary-light: rgba(37, 99, 235, 0.1);
  --clr-secondary: #7C3AED;
  --clr-accent: #F59E0B;
  
  /* Status Colors */
  --clr-success: #22C55E;
  --clr-success-light: rgba(34, 197, 94, 0.1);
  --clr-danger: #EF4444;
  --clr-danger-light: rgba(239, 68, 68, 0.1);
  --clr-warning: #EAB308;
  --clr-info: #0EA5E9;
  
  /* Light Theme Colors (Default) */
  --clr-background: #F8FAFC;
  --clr-surface: #FFFFFF;
  --clr-surface-alt: #F1F5F9;
  --clr-text-main: #1F2937;
  --clr-text-muted: #6B7280;
  --clr-border: #E2E8F0;
  --clr-input-bg: #FFFFFF;
  
  /* Fonts */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Layout & Spacing */
  --container-width: 1200px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Effects */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.3);
  
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-pill: 9999px;
  
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  --transition-bounce: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

:root {
  /* Dark Theme Colors */
  --clr-background: #0F172A;
  --clr-surface: rgba(30, 41, 59, 0.7); /* Glassmorphism base */
  --clr-surface-alt: #1E293B;
  --clr-text-main: #F8FAFC;
  --clr-text-muted: #94A3B8;
  --clr-border: #334155;
  --clr-input-bg: #1E293B;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
}

/* ==========================================================================
   2. Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  color: var(--clr-text-main);
  background-color: var(--clr-background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

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

ul, ol {
  list-style: none;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button, input, textarea, select {
  font: inherit;
  outline: none;
  border: none;
  background: none;
}

button {
  cursor: pointer;
}

/* ==========================================================================
   3. Typography System
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--clr-text-main);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.75rem, 3vw, 2.25rem); }
h4 { font-size: clamp(1.5rem, 2.5vw, 1.75rem); }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
}

.text-gradient {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

.d-flex { display: flex; }
.d-grid { display: grid; }
.flex-col { flex-direction: column; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-xxl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-xxl); }

.pt-5 { padding-top: var(--spacing-xxl); }
.pb-5 { padding-bottom: var(--spacing-xxl); }

/* ==========================================================================
   5. Navigation & Header
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--clr-border);
  transition: background-color var(--transition-normal);
}

:root .header {
  background-color: rgba(15, 23, 42, 0.8);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--clr-text-main);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  color: var(--clr-text-main);
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--clr-primary);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--clr-text-main);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

/* ==========================================================================
   17. Dark Mode Toggle
   ========================================================================== */
/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background-color: var(--clr-primary);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background-color: var(--clr-primary-hover);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.5);
  color: #fff;
}

.btn-secondary {
  background-color: var(--clr-surface-alt);
  color: var(--clr-text-main);
  border: 1px solid var(--clr-border);
}

.btn-secondary:hover {
  background-color: var(--clr-border);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.btn-accent {
  background-color: var(--clr-accent);
  color: #fff;
}

.btn-accent:hover {
  filter: brightness(1.1);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 25px -5px rgba(245, 158, 11, 0.5);
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--clr-primary);
  color: var(--clr-primary);
}

.btn-outline:hover {
  background-color: var(--clr-primary);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.5);
  color: #fff;
}

/* Ripple Effect */
.btn::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  background: rgba(255, 255, 255, 0.5);
  opacity: 0;
  border-radius: 100%;
  transform: scale(1, 1) translate(-50%);
  transform-origin: 50% 50%;
}

.btn:focus:not(:active)::after {
  animation: ripple 1s ease-out;
}

/* ==========================================================================
   6. Hero Section
   ========================================================================== */
.hero {
  position: relative;
  padding: 6rem 0;
  min-height: 80vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--clr-background), var(--clr-primary-light));
  z-index: -2;
}

.hero-shapes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.shape {
  position: absolute;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  filter: blur(80px);
  opacity: 0.3;
}

.shape-1 { width: 300px; height: 300px; top: -100px; right: -50px; animation: float 10s infinite alternate; }
.shape-2 { width: 400px; height: 400px; bottom: -150px; left: -100px; animation: float 12s infinite alternate-reverse; }

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  font-size: clamp(3rem, 6vw, 4.5rem);
  margin-bottom: var(--spacing-lg);
}

.hero p {
  font-size: 1.25rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--spacing-xl);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

/* ==========================================================================
   7. Stats Counter Section
   ========================================================================== */
.stats-section {
  padding: 4rem 0;
  background-color: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

:root .stats-section {
  backdrop-filter: blur(10px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  text-align: center;
}

.stat-item h3 {
  font-size: 3rem;
  color: var(--clr-primary);
  margin-bottom: var(--spacing-xs);
}

.stat-item p {
  font-weight: 600;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin: 0;
}

/* ==========================================================================
   8. Category Cards
   ========================================================================== */
.categories-section {
  padding: 6rem 0;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.category-card {
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-bounce);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
}

:root .category-card {
  backdrop-filter: blur(12px);
}

.category-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: var(--shadow-xl);
  border-color: var(--clr-primary);
}

.category-icon {
  width: 64px;
  height: 64px;
  background-color: var(--clr-primary-light);
  color: var(--clr-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  font-size: 2rem;
  transition: transform var(--transition-normal);
}

.category-card:hover .category-icon {
  transform: scale(1.1) rotate(5deg);
  background-color: var(--clr-primary);
  color: #fff;
}

.category-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.category-count {
  color: var(--clr-text-muted);
  font-size: 0.875rem;
}

/* ==========================================================================
   9. Quiz Card Styles
   ========================================================================== */
.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.quiz-card {
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

:root .quiz-card {
  backdrop-filter: blur(12px);
}

.quiz-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.quiz-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.quiz-card-body {
  padding: var(--spacing-lg);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.quiz-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--clr-text-muted);
}

.quiz-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.quiz-desc {
  font-size: 0.95rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
}

.quiz-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--clr-border);
}

/* ==========================================================================
   10. Quiz Player Page
   ========================================================================== */
.quiz-player-container {
  max-width: 800px;
  margin: 2rem auto;
  background-color: var(--clr-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-xxl);
  position: relative;
}

:root .quiz-player-container {
  backdrop-filter: blur(15px);
  border: 1px solid var(--clr-border);
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

/* Progress Bar */
.progress-container {
  flex-grow: 1;
  margin-right: var(--spacing-xl);
}

.progress-text {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background-color: var(--clr-surface-alt);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-secondary));
  border-radius: var(--radius-pill);
  width: 0%;
  transition: width 0.5s ease;
}

/* Timer Circle */
.timer-wrapper {
  position: relative;
  width: 60px;
  height: 60px;
}

.timer-circle {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.timer-circle-bg {
  fill: none;
  stroke: var(--clr-surface-alt);
  stroke-width: 4;
}

.timer-circle-prog {
  fill: none;
  stroke: var(--clr-accent);
  stroke-width: 4;
  stroke-dasharray: 100;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear;
}

.timer-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-weight: 700;
  font-size: 1.1rem;
}

/* Question */
.question-text {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xl);
  line-height: 1.4;
}

/* Options */
.options-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.option-btn {
  width: 100%;
  text-align: left;
  padding: 1rem 1.5rem;
  background-color: var(--clr-surface-alt);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  cursor: pointer;
}

.option-btn:hover:not(:disabled) {
  background-color: var(--clr-primary-light);
  border-color: var(--clr-primary);
}

.option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--clr-surface);
  border-radius: 50%;
  margin-right: var(--spacing-md);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

/* Option States */
.option-btn.selected {
  border-color: var(--clr-primary);
  background-color: var(--clr-primary-light);
}

.option-btn.correct {
  border-color: var(--clr-success);
  background-color: var(--clr-success-light);
}
.option-btn.correct .option-letter {
  background-color: var(--clr-success);
  color: #fff;
}

.option-btn.wrong {
  border-color: var(--clr-danger);
  background-color: var(--clr-danger-light);
}
.option-btn.wrong .option-letter {
  background-color: var(--clr-danger);
  color: #fff;
}

/* Explanation Box */
.explanation-box {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: var(--clr-info);
  background: rgba(14, 165, 233, 0.1);
  border-left: 4px solid var(--clr-info);
  border-radius: var(--radius-sm);
  display: none;
  animation: fadeIn var(--transition-normal);
}

.explanation-box.show {
  display: block;
}

.explanation-title {
  font-weight: 700;
  color: var(--clr-info);
  margin-bottom: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ==========================================================================
   11. Result Page
   ========================================================================== */
.result-container {
  max-width: 600px;
  margin: 4rem auto;
  text-align: center;
  background-color: var(--clr-surface);
  padding: var(--spacing-xxl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

/* Score Circle */
.score-circle {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto var(--spacing-xl);
}

.score-circle svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.score-circle-bg {
  fill: none;
  stroke: var(--clr-surface-alt);
  stroke-width: 12;
}

.score-circle-prog {
  fill: none;
  stroke: var(--clr-primary);
  stroke-width: 12;
  stroke-linecap: round;
  stroke-dasharray: 565.48; /* 2 * pi * r (r=90) */
  stroke-dashoffset: 565.48;
  animation: fillScore 2s ease-out forwards;
}

.score-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
}

.score-number {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--clr-text-main);
  line-height: 1;
}

.score-label {
  font-size: 1rem;
  color: var(--clr-text-muted);
}

.grade-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-warning));
  color: #fff;
  font-weight: 700;
  border-radius: var(--radius-pill);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  animation: scaleIn 0.5s var(--transition-bounce) forwards;
  animation-delay: 1s;
  opacity: 0;
}

/* Confetti */
.confetti {
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: var(--clr-primary);
  opacity: 0;
}

/* ==========================================================================
   12. Blog Cards
   ========================================================================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.blog-card {
  background-color: var(--clr-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.blog-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.blog-card:hover .blog-img {
  transform: scale(1.05);
}

.blog-img-wrapper {
  overflow: hidden;
  position: relative;
}

.blog-tag {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background-color: var(--clr-primary);
  color: #fff;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  z-index: 1;
}

.blog-content {
  padding: var(--spacing-lg);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.blog-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--spacing-sm);
}

.blog-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.blog-title a {
  color: var(--clr-text-main);
}
.blog-title a:hover {
  color: var(--clr-primary);
}

.blog-excerpt {
  color: var(--clr-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
}

.blog-footer {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  border-top: 1px solid var(--clr-border);
  padding-top: var(--spacing-md);
}

.author-img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.author-name {
  font-weight: 600;
  font-size: 0.9rem;
}

/* ==========================================================================
   13. Form Styles
   ========================================================================== */
.newsletter-section {
  background: linear-gradient(135deg, var(--clr-primary-light), rgba(255, 255, 255, 0.2));
}

.newsletter-card {
  margin: 0 auto;
  width: min(100%, 720px);
  max-width: 720px;
  padding: 3rem 2rem;
  text-align: center;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
}

.newsletter-form {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  width: min(100%, 560px);
  flex-wrap: wrap;
  margin-top: var(--spacing-md);
}

.newsletter-input {
  flex: 1 1 280px;
  min-width: 240px;
}

.newsletter-btn {
  flex: 0 0 auto;
  min-width: 140px;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  color: var(--clr-text-main);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--clr-text-main);
  background-color: var(--clr-input-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-control:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px var(--clr-primary-light);
  outline: none;
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

@media (max-width: 576px) {
  .newsletter-card {
    padding: 1.75rem 1rem;
  }

  .newsletter-form {
    flex-direction: column;
    width: 100%;
  }

  .newsletter-input,
  .newsletter-btn {
    width: 100%;
  }
}

/* ==========================================================================
   14. Leaderboard Table
   ========================================================================== */
.leaderboard-container {
  background-color: var(--clr-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

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

.table th,
.table td {
  padding: 1rem var(--spacing-lg);
  text-align: left;
  border-bottom: 1px solid var(--clr-border);
}

.table th {
  background-color: var(--clr-surface-alt);
  font-weight: 600;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.5px;
}

.table tbody tr {
  transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
  background-color: var(--clr-surface-alt);
}

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  font-weight: 700;
  background-color: var(--clr-surface-alt);
}

.rank-1 .rank-badge { background-color: #FFD700; color: #000; }
.rank-2 .rank-badge { background-color: #C0C0C0; color: #000; }
.rank-3 .rank-badge { background-color: #CD7F32; color: #fff; }

.user-cell {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

/* ==========================================================================
   15. Footer
   ========================================================================== */
.footer {
  background-color: #0F172A; /* Always dark */
  color: #94A3B8;
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: #F8FAFC;
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: #F8FAFC;
  margin-bottom: var(--spacing-md);
  display: block;
}

.footer-desc {
  margin-bottom: var(--spacing-lg);
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  color: #F8FAFC;
  border-radius: 50%;
  transition: all var(--transition-normal);
}

.social-link:hover {
  background-color: var(--clr-primary);
  transform: translateY(-3px);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-links a {
  color: #94A3B8;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--clr-primary);
  padding-left: 5px;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   16. Cookie Consent Banner
   ========================================================================== */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: var(--spacing-md) 0;
  z-index: 9999;
  box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

:root .cookie-banner {
  background-color: #1E293B;
}

.cookie-banner.show {
  transform: translateY(0);
}

.cookie-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.cookie-text {
  font-size: 0.9rem;
  margin: 0;
}

/* ==========================================================================
   20. Ad Placeholder
   ========================================================================== */
.ad-placeholder {
  width: 100%;
  background-color: var(--clr-surface-alt);
  border: 1px dashed var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-text-muted);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin: var(--spacing-xl) auto;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.ad-placeholder::after {
  content: 'AdSpace';
  position: absolute;
  opacity: 0.5;
  font-weight: 700;
  font-size: 2rem;
  color: var(--clr-border);
}

.ad-banner { min-height: 90px; max-width: 728px; }
.ad-infeed { min-height: 250px; max-width: 300px; }
.ad-sidebar { min-height: 600px; max-width: 300px; }
.ad-footer { min-height: 90px; max-width: 728px; }
.ad-leaderboard { height: 90px; max-width: 728px; }
.ad-rectangle { height: 250px; max-width: 300px; }

/* ==========================================================================
   21. Breadcrumbs
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) 0;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
}

.breadcrumb a {
  color: var(--clr-text-muted);
}

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

.breadcrumb-separator {
  margin: 0 var(--spacing-xs);
}

/* ==========================================================================
   22. Badges / Chips
   ========================================================================== */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-easy { background-color: var(--clr-success-light); color: var(--clr-success); }
.badge-medium { background-color: rgba(234, 179, 8, 0.1); color: var(--clr-warning); }
.badge-hard { background-color: var(--clr-danger-light); color: var(--clr-danger); }
.badge-primary { background-color: var(--clr-primary-light); color: var(--clr-primary); }

/* ==========================================================================
   23. Pagination
   ========================================================================== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

.page-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  color: var(--clr-text-main);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.page-btn:hover:not(.disabled) {
  background-color: var(--clr-primary-light);
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}

.page-btn.active {
  background-color: var(--clr-primary);
  border-color: var(--clr-primary);
  color: #fff;
}

.page-btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==========================================================================
   24. Modal / Overlay
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9);
  transition: transform var(--transition-bounce);
  position: relative;
}

.modal-overlay.show .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--clr-danger);
}

/* ==========================================================================
   25. 404 Page Styles
   ========================================================================== */
.error-page {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex-direction: column;
}

.error-code {
  font-size: 10rem;
  font-weight: 800;
  font-family: var(--font-heading);
  line-height: 1;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: pulse 2s infinite;
}

.error-title {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.error-desc {
  color: var(--clr-text-muted);
  margin-bottom: var(--spacing-lg);
  max-width: 500px;
}

/* ==========================================================================
   18. & 19. Animations & Scroll Effects
   ========================================================================== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-50px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes float {
  0% { transform: translateY(0px) rotate(0deg); }
  100% { transform: translateY(-30px) rotate(10deg); }
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes ripple {
  0% { transform: scale(0, 0); opacity: 0.5; }
  100% { transform: scale(20, 20); opacity: 0; }
}

@keyframes fillScore {
  to { stroke-dashoffset: 113.09; /* example 80% */ }
}

.animate {
  opacity: 0;
}

.animate.fade-in { animation: fadeIn 0.8s ease forwards; }
.animate.slide-up { animation: slideUp 0.8s ease forwards; }
.animate.slide-left { animation: slideInLeft 0.8s ease forwards; }
.animate.slide-right { animation: slideInRight 0.8s ease forwards; }
.animate.scale-in { animation: scaleIn 0.8s var(--transition-bounce) forwards; }

.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }
.delay-500 { animation-delay: 500ms; }

/* ==========================================================================
   26. Responsive Media Queries
   ========================================================================== */

/* 1200px (Large Desktops) */
@media (max-width: 1200px) {
  :root {
    --container-width: 960px;
  }
}

/* 992px (Desktops & Tablets Landscape) */
@media (max-width: 992px) {
  :root {
    --container-width: 720px;
  }
  
  .hero h1 {
    font-size: 3rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* 768px (Tablets Portrait) */
@media (max-width: 768px) {
  :root {
    --container-width: 540px;
  }
  
  .nav-links {
    display: none; /* Mobile menu hidden by default */
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: var(--clr-surface);
    flex-direction: column;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .cookie-content {
    flex-direction: column;
    text-align: center;
  }
}

/* 576px (Large Phones) */
@media (max-width: 576px) {
  :root {
    --container-width: 100%;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .quiz-header {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .progress-container {
    width: 100%;
    margin-right: 0;
  }
}

/* 375px (Small Phones) */
@media (max-width: 375px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .category-grid,
  .quiz-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .score-circle {
    width: 150px;
    height: 150px;
  }
  
  .score-number {
    font-size: 2.5rem;
  }
}

/* ==========================================================================
   27. Print Styles
   ========================================================================== */
@media print {
  body {
    background-color: #fff;
    color: #000;
  }
  
  .header,
  .footer,
  .hero-bg,
  .hero-shapes,
  .cookie-banner,
  .theme-toggle,
  .btn,
  .ad-placeholder {
    display: none !important;
  }
  
  .container {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
  }
  
  .quiz-player-container,
  .result-container,
  .blog-card,
  .quiz-card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
  
  h1, h2, h3, h4, h5, h6, p, .text-muted {
    color: #000 !important;
  }
  
  a {
    text-decoration: underline;
    color: #000;
  }
}