/* computerclass.my - Shared Styles */
/* Malaysian Coding Bootcamp for Standard 5 Students (Age 11) */

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

:root {
  /* Primary Colors - Cool Palette for computerclass.my */
  --primary-blue: #0EA5E9;      /* Sky Blue - Module 1 */
  --primary-cyan: #06B6D4;      /* Cyan - Module 2 */
  --primary-teal: #14B8A6;      /* Teal - Module 3 (replaces purple) */
  --primary-green: #10B981;     /* Emerald - Module 4 */

  /* Accent Colors (warm tones for CTAs and highlights) */
  --accent-orange: #F59E0B;     /* For buttons/highlights */
  --accent-yellow: #FBBF24;     /* For achievements */

  /* Light Backgrounds - Cool tones */
  --light-blue: #E0F2FE;
  --light-cyan: #CFFAFE;
  --light-teal: #CCFBF1;
  --light-green: #D1FAE5;

  /* Neutral Colors */
  --dark: #1A2633;
  --gray: #6B7280;
  --light-gray: #F3F4F6;
  --white: #FFFFFF;

  /* Module Colors - Cool Palette */
  --module1-color: var(--primary-blue);
  --module2-color: var(--primary-cyan);
  --module3-color: var(--primary-teal);
  --module4-color: var(--primary-green);

  /* Gradients - Cool tones */
  --gradient-hero: linear-gradient(135deg, #0EA5E9 0%, #14B8A6 100%);
  --gradient-fun: linear-gradient(135deg, #14B8A6 0%, #10B981 100%);
  --gradient-cool: linear-gradient(135deg, #0EA5E9 0%, #10B981 100%);
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  --shadow-glow: 0 0 20px rgba(74, 144, 226, 0.3);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --radius-round: 50%;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark);
  background: var(--light-gray);
  background-image: radial-gradient(var(--gray) 0.5px, transparent 0.5px);
  background-size: 24px 24px;
  background-attachment: fixed;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Quicksand', sans-serif;
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
}

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: var(--spacing-lg) 0;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
  background: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: 'Quicksand', sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--primary-blue);
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-hero);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--white);
}

.nav-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.9rem;
  color: var(--gray);
}

.nav-breadcrumb a {
  color: var(--primary-blue);
  transition: var(--transition-fast);
}

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

.nav-breadcrumb span {
  color: var(--gray);
}

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

.mute-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-round);
  background: var(--light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  transition: var(--transition-fast);
  user-select: none;
  border: none;
}

.mute-toggle:hover {
  background: var(--light-blue);
  transform: scale(1.1);
}

/* Language Switcher */
.language-switcher {
  display: flex;
  gap: 4px;
  background: var(--light-gray);
  border-radius: var(--radius-xl);
  padding: 4px;
}

.lang-btn {
  padding: 6px 12px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--gray);
  transition: var(--transition-fast);
  white-space: nowrap;
}

.lang-btn:hover {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-teal);
}

.lang-btn.active {
  background: var(--primary-teal);
  color: white;
  box-shadow: var(--shadow-sm);
}

.lang-btn:focus {
  outline: 2px solid var(--primary-teal);
  outline-offset: 2px;
}

/* Music Toggle Button */
.music-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-round);
  background: var(--light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  transition: var(--transition-fast);
  user-select: none;
  border: none;
}

.music-toggle:hover {
  background: var(--light-teal);
  transform: scale(1.1);
}

.music-toggle.playing {
  background: linear-gradient(135deg, #14B8A6, #10B981);
  color: white;
  animation: pulse 2s infinite;
}

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

/* Audio Controls Container */
.audio-controls {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
}

.progress-bar {
  width: 140px;
  height: 12px;
  background: rgba(0, 0, 0, 0.05);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.progress-fill {
  height: 100%;
  background: var(--gradient-cool);
  border-radius: var(--radius-xl);
  transition: width var(--transition-slow);
  box-shadow: 0 0 10px rgba(14, 165, 233, 0.3);
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.3) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.progress-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background: var(--gradient-hero);
  color: var(--white);
  padding: var(--spacing-xl) 0;
  text-align: center;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  margin-bottom: var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
  animation: float 15s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(30px, 30px) rotate(180deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.95;
  max-width: 600px;
  margin: 0 auto;
}

.hero-emoji {
  font-size: 4rem;
  margin-bottom: var(--spacing-sm);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

/* ============================================
   MODULE CARDS
   ============================================ */

.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.module-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
}

.module-card.module-1::before { background: var(--module1-color); }
.module-card.module-2::before { background: var(--module2-color); }
.module-card.module-3::before { background: var(--module3-color); }
.module-card.module-4::before { background: var(--module4-color); }

.module-card:hover {
  transform: translateY(-10px) scale(1.02) rotate(1deg);
  box-shadow: var(--shadow-lg);
}

.module-icon {
  width: 70px;
  height: 70px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.module-1 .module-icon { background: var(--light-blue); }
.module-2 .module-icon { background: var(--light-orange); }
.module-3 .module-icon { background: var(--light-purple); }
.module-4 .module-icon { background: var(--light-green); }

.module-card h3 {
  margin-bottom: var(--spacing-xs);
}

.module-card p {
  color: var(--gray);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-md);
}

.module-progress {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.85rem;
  color: var(--gray);
}

.module-progress .progress-bar {
  flex: 1;
}

/* ============================================
   LESSON CARDS
   ============================================ */

.lessons-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.lesson-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  cursor: pointer;
}

.lesson-card:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow-md);
}

.lesson-number {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-round);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--white);
  flex-shrink: 0;
}

.module-1 .lesson-number { background: var(--module1-color); }
.module-2 .lesson-number { background: var(--module2-color); }
.module-3 .lesson-number { background: var(--module3-color); }
.module-4 .lesson-number { background: var(--module4-color); }

.lesson-info {
  flex: 1;
}

.lesson-info h4 {
  margin-bottom: 4px;
}

.lesson-info p {
  font-size: 0.9rem;
  color: var(--gray);
}

.lesson-status {
  font-size: 1.5rem;
}

.lesson-card.completed .lesson-status::after { content: '✅'; }
.lesson-card.in-progress .lesson-status::after { content: '📝'; }
.lesson-card.locked .lesson-status::after { content: '🔒'; }

/* ============================================
   LESSON PAGE LAYOUT
   ============================================ */

.lesson-container {
  max-width: 900px;
  margin: 0 auto;
}

.lesson-header {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.lesson-header h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.lesson-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.9rem;
  color: var(--gray);
}

.lesson-tabs {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.tab-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: var(--white);
  border-radius: var(--radius-xl);
  font-family: 'Nunito', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.tab-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.tab-content {
  display: none;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

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

/* ============================================
   INTERACTIVE ELEMENTS
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-xl);
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-blue);
  color: var(--white);
}

.btn-primary:hover {
  background: #2563EB;
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 10px 20px rgba(58, 134, 255, 0.3);
}

.btn-success {
  background: var(--primary-green);
  color: var(--white);
}

.btn-success:hover {
  background: #2D8A00;
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 10px 20px rgba(56, 176, 0, 0.3);
}

.btn-orange {
  background: var(--primary-orange);
  color: var(--white);
}

.btn-orange:hover {
  background: #EBB000;
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 10px 20px rgba(255, 190, 11, 0.3);
}

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

.btn-outline:hover {
  background: var(--primary-blue);
  color: var(--white);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.1rem;
}

/* ============================================
   QUIZ COMPONENTS
   ============================================ */

.quiz-container {
  max-width: 700px;
  margin: 0 auto;
}

.quiz-progress {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.quiz-progress span {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--primary-blue);
}

.quiz-question {
  background: var(--light-blue);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.quiz-question h4 {
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.question-number {
  background: var(--primary-blue);
  color: var(--white);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-round);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
}

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

.quiz-option {
  background: var(--white);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.quiz-option:hover {
  border-color: var(--primary-blue);
  transform: translateX(5px);
}

.quiz-option.selected {
  border-color: var(--primary-blue);
  background: var(--light-blue);
}

.quiz-option.correct {
  border-color: var(--primary-green);
  background: var(--light-green);
}

.quiz-option.incorrect {
  border-color: #e74c3c;
  background: #ffeaea;
}

.option-letter {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-round);
  background: var(--light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.quiz-option.selected .option-letter {
  background: var(--primary-blue);
  color: var(--white);
}

.quiz-feedback {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  display: none;
}

.quiz-feedback.show {
  display: block;
  animation: fadeIn 0.3s ease;
}

.quiz-feedback.correct {
  background: var(--light-green);
  border-left: 4px solid var(--primary-green);
}

.quiz-feedback.incorrect {
  background: #ffeaea;
  border-left: 4px solid #e74c3c;
}

.quiz-result {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--gradient-hero);
  color: var(--white);
  border-radius: var(--radius-lg);
}

.quiz-result .score {
  font-size: 4rem;
  font-weight: 800;
}

.quiz-result .message {
  font-size: 1.3rem;
  margin: var(--spacing-md) 0;
}

/* ============================================
   INTERACTIVE PLAYGROUND
   ============================================ */

.playground {
  background: #1e1e1e;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.playground-header {
  background: #333;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.playground-dot {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-round);
}

.playground-dot.red { background: #ff5f56; }
.playground-dot.yellow { background: #ffbd2e; }
.playground-dot.green { background: #27ca40; }

.playground-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 300px;
}

.playground-editor {
  background: #1e1e1e;
  padding: var(--spacing-md);
}

.playground-editor textarea {
  width: 100%;
  height: 100%;
  min-height: 250px;
  background: transparent;
  border: none;
  color: #d4d4d4;
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 14px;
  line-height: 1.5;
  resize: none;
  outline: none;
}

.playground-preview {
  background: var(--white);
  padding: var(--spacing-md);
  border-left: 1px solid #333;
}

.playground-preview iframe {
  width: 100%;
  height: 100%;
  border: none;
  min-height: 250px;
}

/* ============================================
   DRAG AND DROP BLOCKS
   ============================================ */

.blocks-container {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.blocks-palette {
  flex: 1;
  min-width: 200px;
  background: var(--light-gray);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.blocks-palette h4 {
  margin-bottom: var(--spacing-md);
  color: var(--gray);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.blocks-workspace {
  flex: 2;
  min-width: 300px;
  background: var(--white);
  border: 2px dashed var(--light-gray);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  min-height: 300px;
}

.code-block {
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-xs);
  border-radius: var(--radius-sm);
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 0.9rem;
  cursor: grab;
  transition: var(--transition-fast);
  user-select: none;
}

.code-block:active {
  cursor: grabbing;
}

.code-block.motion { background: #4C97FF; color: white; }
.code-block.looks { background: #9966FF; color: white; }
.code-block.sound { background: #CF63CF; color: white; }
.code-block.events { background: #FFBF00; color: #333; }
.code-block.control { background: #FFAB19; color: white; }
.code-block.sensing { background: #5CB1D6; color: white; }

.code-block.dragging {
  opacity: 0.7;
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   ACHIEVEMENT BADGES
   ============================================ */

.badges-container {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
  margin: var(--spacing-lg) 0;
}

.badge {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-round);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--light-gray);
  transition: var(--transition-normal);
}

.badge.earned {
  background: var(--gradient-fun);
  color: var(--white);
  animation: badgeBounce 0.6s cubic-bezier(0.36, 0, 0.66, -0.56) infinite alternate;
}

@keyframes badgeBounce {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(-10px) scale(1.1) rotate(5deg); }
}

.badge-icon {
  font-size: 2rem;
}

.badge-name {
  font-size: 0.7rem;
  font-weight: 600;
  text-align: center;
  margin-top: 4px;
}

/* ============================================
   GAME ELEMENTS
   ============================================ */

.game-area {
  background: var(--dark);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  min-height: 400px;
  position: relative;
}

.game-character {
  position: absolute;
  font-size: 3rem;
  transition: all 0.3s ease;
}

.game-controls {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-top: var(--spacing-md);
}

.game-btn {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--primary-blue);
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.game-btn:hover {
  background: #3a7bc8;
  transform: scale(1.1);
}

.game-btn:active {
  transform: scale(0.95);
}

/* ============================================
   NAVIGATION
   ============================================ */

.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--light-gray);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--white);
  border: 2px solid var(--light-gray);
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
}

.nav-btn:hover {
  border-color: var(--primary-blue);
  color: var(--primary-blue);
}

.nav-btn.next {
  background: var(--primary-blue);
  color: var(--white);
  border-color: var(--primary-blue);
}

.nav-btn.next:hover {
  background: #3a7bc8;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--dark);
  color: var(--white);
  padding: var(--spacing-lg) 0;
  text-align: center;
  margin-top: auto;
}

.footer p {
  opacity: 0.8;
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-sm);
}

.footer-links a {
  color: var(--primary-blue);
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary-orange);
}

/* ============================================
   ROBOT COMPONENTS
   ============================================ */

.robot-builder {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.robot-display {
  flex: 1;
  min-width: 250px;
  background: var(--light-gray);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.robot-parts {
  flex: 1;
  min-width: 250px;
}

.robot-part {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.robot-part:hover {
  background: var(--light-blue);
  transform: translateX(5px);
}

.robot-part.selected {
  background: var(--primary-blue);
  color: var(--white);
}

/* ============================================
   MAZE GAME
   ============================================ */

.maze-container {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.maze-grid {
  display: grid;
  gap: 2px;
  background: var(--dark);
  padding: 2px;
  border-radius: var(--radius-md);
}

.maze-cell {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.maze-cell.wall { background: var(--dark); }
.maze-cell.path { background: var(--white); }
.maze-cell.start { background: var(--light-green); }
.maze-cell.end { background: var(--light-orange); }
.maze-cell.robot { background: var(--light-blue); }

.maze-commands {
  flex: 1;
  min-width: 200px;
}

/* ============================================
   INFO BOXES
   ============================================ */

.info-box {
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  display: flex;
  gap: var(--spacing-sm);
}

.info-box.tip {
  background: var(--light-blue);
  border-left: 4px solid var(--primary-blue);
}

.info-box.warning {
  background: var(--light-orange);
  border-left: 4px solid var(--primary-orange);
}

.info-box.success {
  background: var(--light-green);
  border-left: 4px solid var(--primary-green);
}

.info-box-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

/* Activity and Practice Section Styles */
.activity-instructions {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: var(--spacing-md) 0;
  box-shadow: var(--shadow-sm);
}

.activity-instructions h4 {
  color: var(--primary-blue);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.activity-instructions h4:first-child {
  margin-top: 0;
}

.activity-instructions ol,
.activity-instructions ul {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
}

.activity-instructions li {
  margin: var(--spacing-xs) 0;
  line-height: 1.6;
}

.challenge-item {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: var(--spacing-md) 0;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--primary-blue);
}

.challenge-item h4 {
  color: var(--primary-blue);
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

.challenge-item p {
  margin: var(--spacing-sm) 0;
  line-height: 1.6;
}

.challenge-item ul,
.challenge-item ol {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
}

.challenge-item li {
  margin: var(--spacing-xs) 0;
  line-height: 1.6;
}

/* ============================================
   ANIMATIONS
   ============================================ */

.animate-in {
  animation: slideIn 0.5s ease forwards;
}

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

.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  
  .header-inner {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .playground-body {
    grid-template-columns: 1fr;
  }
  
  .playground-preview {
    border-left: none;
    border-top: 1px solid #333;
  }
  
  .lesson-tabs {
    justify-content: center;
  }
  
  .blocks-container,
  .robot-builder,
  .maze-container {
    flex-direction: column;
  }
  
  .lesson-nav {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav-btn {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .module-card,
  .lesson-header,
  .tab-content {
    padding: var(--spacing-md);
  }
  
  .quiz-question {
    padding: var(--spacing-md);
  }
  
  .btn-lg {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
  }
}

/* ============================================
   PRINT STYLES (for worksheets)
   ============================================ */

@media print {
  .header,
  .footer,
  .lesson-nav,
  .lesson-tabs,
  .btn {
    display: none !important;
  }
  
  .tab-content {
    display: block !important;
    box-shadow: none !important;
  }
  
  body {
    background: white;
  }
}