/* ============================================
   QUIZZY.FUN — Design System v2.0
   ============================================ */

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

:root {
  --primary: #FF6154;
  --primary-light: #FF8A80;
  --primary-dark: #E5453A;
  --secondary: #4CC9F0;
  --secondary-light: #7DD8F4;
  --correct: #06D6A0;
  --correct-bg: #E8FBF4;
  --wrong: #EF476F;
  --wrong-bg: #FDE8ED;
  --yellow: #FFD166;
  --yellow-light: #FFF3D4;
  --purple: #7B68EE;
  --dark: #1A1A2E;
  --dark-soft: #2D2D44;
  --gray-900: #1A1A2E;
  --gray-700: #4A4A5A;
  --gray-500: #7A7A8A;
  --gray-300: #C4C4D4;
  --gray-200: #E2E2EE;
  --gray-100: #F0F0F8;
  --bg: #FFFBF7;
  --bg-cool: #F8F9FF;
  --card: #FFFFFF;
  --shadow-sm: 0 2px 8px rgba(26,26,46,0.06);
  --shadow-md: 0 4px 20px rgba(26,26,46,0.08);
  --shadow-lg: 0 8px 40px rgba(26,26,46,0.12);
  --shadow-xl: 0 16px 60px rgba(26,26,46,0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --font-display: 'Fredoka', sans-serif;
  --font-body: 'Nunito', sans-serif;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  color: var(--dark);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ============================================
   HEADER / NAV
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,251,247,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(26,26,46,0.06);
  padding: 0 24px;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--dark);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: white;
  font-weight: 700;
  font-family: var(--font-display);
  box-shadow: 0 4px 12px rgba(255,97,84,0.3);
}

.logo-text {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--dark);
}

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

.nav-wrap {
  position: relative;
  flex: 1;
  min-width: 0;
  margin-left: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
  -ms-overflow-style: none;
  scrollbar-width: none;
  padding: 0 4px;
}

.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  text-decoration: none;
  color: var(--gray-700);
  font-weight: 600;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.nav-links a:hover { color: var(--primary); background: rgba(255,97,84,0.08); }
.nav-links a.active { color: var(--primary); background: rgba(255,97,84,0.1); }

.nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: rgba(240,240,248,0.9);
  color: var(--gray-700);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  box-shadow: 0 1px 4px rgba(26,26,46,0.1);
  opacity: 0;
  pointer-events: none;
}

.nav-arrow.visible {
  opacity: 1;
  pointer-events: auto;
}

.nav-arrow:hover {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 8px rgba(255,97,84,0.3);
}

.nav-arrow-left { left: -2px; }
.nav-arrow-right { right: -2px; }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 8px;
  color: var(--dark);
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
  .nav-wrap { display: none; }
  .nav-wrap.mobile-open { display: block; position: absolute; top: 56px; left: 0; right: 0; margin-left: 0; }
  .nav-wrap.mobile-open .nav-links {
    display: flex;
    flex-direction: column;
    background: var(--card);
    padding: 16px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
    overflow-x: visible;
  }
  .nav-wrap.mobile-open .nav-arrow { display: none; }
  .nav-links a { padding: 12px 16px; }
  .nav-wrap.mobile-open .nav-links a { width: 100%; }
}

/* ============================================
   HERO SECTION (Homepage)
   ============================================ */

.hero {
  text-align: center;
  padding: 60px 24px 40px;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--dark);
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero h1 .highlight {
  background: linear-gradient(270deg, #FF6154, #FF8A80, #7B68EE, #4CC9F0, #06D6A0, #FFD166, #EF476F, #FF6154);
  background-size: 400% 400%;
  animation: gradientShift 8s ease infinite;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: clamp(17px, 2.5vw, 20px);
  color: var(--gray-500);
  max-width: 560px;
  margin: 0 auto 32px;
  font-weight: 500;
}

.hero-stats { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat .number { font-family: var(--font-display); font-size: 28px; font-weight: 700; color: var(--primary); }
.hero-stat .label { font-size: 14px; color: var(--gray-500); font-weight: 600; }

/* ============================================
   CATEGORY TABS
   ============================================ */

.category-bar {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 32px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.category-bar::-webkit-scrollbar { display: none; }

.category-tabs { display: flex; gap: 10px; list-style: none; justify-content: center; flex-wrap: wrap; }

.category-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-700);
  background: var(--card);
  border: 2px solid var(--gray-200);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
  font-family: var(--font-body);
}

.category-tab:hover { border-color: var(--primary-light); color: var(--primary); transform: translateY(-1px); }
.category-tab.active { background: var(--primary); color: white; border-color: var(--primary); box-shadow: 0 4px 12px rgba(255,97,84,0.3); }
.category-tab .emoji { font-size: 18px; }

/* ============================================
   QUIZ CARD GRID
   ============================================ */

.quiz-grid-section { max-width: 1200px; margin: 0 auto; padding: 0 24px 60px; }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.section-header h2 { font-family: var(--font-display); font-size: 28px; font-weight: 700; }
.section-header a { color: var(--primary); font-weight: 600; text-decoration: none; font-size: 15px; }

.quiz-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }

.quiz-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: var(--dark);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  border: 2px solid transparent;
}
.quiz-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }

.quiz-card-image {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
  position: relative;
  overflow: hidden;
}

.quiz-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.quiz-card-category { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; color: var(--primary); margin-bottom: 8px; }
.quiz-card-title { font-family: var(--font-display); font-size: 20px; font-weight: 600; margin-bottom: 8px; line-height: 1.3; }
.quiz-card-desc { font-size: 14px; color: var(--gray-500); margin-bottom: 16px; flex: 1; line-height: 1.5; }
.quiz-card-meta { display: flex; align-items: center; gap: 16px; font-size: 13px; color: var(--gray-500); font-weight: 600; }
.quiz-card-meta span { display: flex; align-items: center; gap: 4px; }

.difficulty-badge { display: inline-block; padding: 3px 10px; border-radius: 100px; font-size: 12px; font-weight: 700; }
.difficulty-easy { background: var(--correct-bg); color: #059669; }
.difficulty-medium { background: var(--yellow-light); color: #B45309; }
.difficulty-hard { background: var(--wrong-bg); color: #DC2626; }

.card-theme-red { background: linear-gradient(135deg, #FFE5E5, #FFF0F0); }
.card-theme-blue { background: linear-gradient(135deg, #E5F0FF, #F0F7FF); }
.card-theme-green { background: linear-gradient(135deg, #E5FFE5, #F0FFF0); }
.card-theme-purple { background: linear-gradient(135deg, #F0E5FF, #F5F0FF); }
.card-theme-yellow { background: linear-gradient(135deg, #FFF5E5, #FFFAF0); }
.card-theme-teal { background: linear-gradient(135deg, #E5FFF5, #F0FFFA); }
.card-theme-orange { background: linear-gradient(135deg, #FFF0E5, #FFF5F0); }
.card-theme-pink { background: linear-gradient(135deg, #FFE5F0, #FFF0F5); }

/* ============================================
   QUIZ PAGE LAYOUT — COMPACT
   ============================================ */

.quiz-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 16px 20px 60px;
}

.quiz-header {
  text-align: center;
  margin-bottom: 20px;
}

.quiz-header .category-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary);
  margin-bottom: 4px;
  text-decoration: none;
}

.quiz-header h1 {
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  margin-bottom: 4px;
  line-height: 1.2;
}

.quiz-header .quiz-desc {
  font-size: 16px;
  color: var(--gray-500);
  font-weight: 500;
}

/* Progress Bar */
.progress-container { margin-bottom: 16px; }

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-500);
}
.progress-info .question-count { color: var(--dark); }
.progress-info .score { color: var(--correct); }

.progress-bar { width: 100%; height: 6px; background: var(--gray-100); border-radius: 100px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--purple)); border-radius: 100px; transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1); }

/* Question Card — COMPACT */
.question-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 24px 24px;
  box-shadow: var(--shadow-md);
  animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.question-number {
  font-size: 12px;
  font-weight: 700;
  color: var(--gray-300);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.question-text {
  font-family: var(--font-display);
  font-size: clamp(20px, 3.5vw, 26px);
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 20px;
  color: var(--dark);
}

.question-image {
  width: 100%;
  max-height: 240px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

/* Answer Options — COMPACT */
.answers-grid { display: flex; flex-direction: column; gap: 8px; }

.answer-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 2px solid var(--gray-200);
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  color: var(--dark);
  text-align: left;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  min-height: 48px;
}

.answer-btn:hover:not(.answered) {
  border-color: var(--primary-light);
  background: rgba(255,97,84,0.05);
  transform: translateX(4px);
}

.answer-letter {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  background: var(--gray-100);
  color: var(--gray-500);
  flex-shrink: 0;
  transition: var(--transition);
}

.answer-btn:hover:not(.answered) .answer-letter { background: var(--primary); color: white; }

.answer-btn.correct { border-color: var(--correct); background: var(--correct-bg); animation: correctPop 0.4s ease; }
.answer-btn.correct .answer-letter { background: var(--correct); color: white; }
.answer-btn.wrong { border-color: var(--wrong); background: var(--wrong-bg); animation: shake 0.4s ease; }
.answer-btn.wrong .answer-letter { background: var(--wrong); color: white; }
.answer-btn.answered { cursor: default; opacity: 0.6; }
.answer-btn.correct.answered, .answer-btn.wrong.answered { opacity: 1; }
.answer-btn.show-correct { border-color: var(--correct); background: var(--correct-bg); opacity: 1; }
.answer-btn.show-correct .answer-letter { background: var(--correct); color: white; }

@keyframes correctPop { 0% { transform: scale(1); } 50% { transform: scale(1.02); } 100% { transform: scale(1); } }
@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }

/* Explanation — COMPACT */
.explanation {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--bg-cool);
  border-radius: 12px;
  font-size: 15px;
  color: var(--gray-700);
  line-height: 1.5;
  border-left: 4px solid var(--secondary);
  animation: fadeInUp 0.3s ease;
}

/* Next Button — COMPACT */
.next-btn {
  display: block;
  width: 100%;
  margin-top: 14px;
  padding: 14px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 12px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  animation: fadeInUp 0.3s ease 0.05s both;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.next-btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,97,84,0.3); }

/* ============================================
   RESULTS SCREEN
   ============================================ */

.results-screen { text-align: center; animation: fadeInUp 0.5s ease; }
.results-celebration { font-size: 64px; margin-bottom: 16px; animation: bounceIn 0.6s ease; }

@keyframes bounceIn { 0% { transform: scale(0); opacity: 0; } 50% { transform: scale(1.2); } 100% { transform: scale(1); opacity: 1; } }

.results-score { font-family: var(--font-display); font-size: clamp(48px, 10vw, 72px); font-weight: 700; line-height: 1; margin-bottom: 8px; }
.results-score .correct-count { color: var(--primary); }
.results-score .total-count { color: var(--gray-300); }
.results-tier { font-family: var(--font-display); font-size: clamp(22px, 4vw, 28px); font-weight: 600; color: var(--gray-700); margin-bottom: 8px; }
.results-message { font-size: 17px; color: var(--gray-500); margin-bottom: 32px; max-width: 480px; margin-left: auto; margin-right: auto; }

.results-percentage-bar { width: 100%; max-width: 400px; height: 12px; background: var(--gray-100); border-radius: 100px; overflow: hidden; margin: 0 auto 32px; }
.results-percentage-fill { height: 100%; border-radius: 100px; transition: width 1s cubic-bezier(0.4, 0, 0.2, 1) 0.3s; width: 0; }
.results-fill-low { background: var(--wrong); }
.results-fill-medium { background: var(--yellow); }
.results-fill-good { background: var(--secondary); }
.results-fill-great { background: var(--correct); }

.results-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,97,84,0.3); }
.btn-secondary { background: var(--card); color: var(--dark); border: 2px solid var(--gray-200); }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.btn-share { background: #1DA1F2; color: white; }
.btn-share:hover { background: #1A91DA; transform: translateY(-2px); }

/* ============================================
   RELATED QUIZZES
   ============================================ */

.related-section { margin-top: 48px; padding-top: 48px; border-top: 2px solid var(--gray-100); }
.related-section h2 { font-family: var(--font-display); font-size: 24px; font-weight: 700; margin-bottom: 24px; text-align: center; }

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

.site-footer { max-width: 1200px; margin: 0 auto; padding: 40px 24px; border-top: 2px solid var(--gray-100); text-align: center; }
.footer-logo { font-family: var(--font-display); font-size: 22px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.footer-logo span { color: var(--primary); }
.footer-text { font-size: 14px; color: var(--gray-500); }
.footer-links { display: flex; justify-content: center; gap: 24px; margin-top: 16px; list-style: none; }
.footer-links a { font-size: 14px; color: var(--gray-500); text-decoration: none; font-weight: 600; transition: var(--transition); }
.footer-links a:hover { color: var(--primary); }

/* ============================================
   CATEGORY PAGE
   ============================================ */

.category-hero { text-align: center; padding: 48px 24px 32px; }
.category-hero .cat-emoji { font-size: 56px; margin-bottom: 12px; }
.category-hero h1 { font-family: var(--font-display); font-size: clamp(32px, 5vw, 44px); font-weight: 700; margin-bottom: 8px; }
.category-hero p { font-size: 18px; color: var(--gray-500); max-width: 500px; margin: 0 auto; }
.category-count { display: inline-block; margin-top: 16px; padding: 6px 16px; background: var(--primary); color: white; border-radius: 100px; font-size: 14px; font-weight: 700; }

/* ============================================
   START SCREEN (Quiz Landing)
   ============================================ */

.start-screen { text-align: center; padding: 40px 32px; background: var(--card); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.start-emoji { font-size: 64px; margin-bottom: 16px; }
.start-screen h2 { font-family: var(--font-display); font-size: 20px; margin-bottom: 16px; color: var(--gray-700); }
.start-details { display: flex; justify-content: center; gap: 32px; margin-bottom: 28px; font-size: 15px; color: var(--gray-500); font-weight: 600; }
.start-details span { display: flex; align-items: center; gap: 6px; }

.start-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 48px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-bounce);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.start-btn:hover { background: var(--primary-dark); transform: scale(1.05); box-shadow: 0 8px 24px rgba(255,97,84,0.35); }

/* Confetti canvas */
#confetti-canvas { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 1000; }

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

@media (max-width: 640px) {
  .quiz-card-image { height: 120px; font-size: 44px; }
  .question-card { padding: 20px 16px; }
  .answer-btn { padding: 12px 14px; font-size: 16px; min-height: 48px; }
  .answer-letter { width: 28px; height: 28px; font-size: 13px; }
  .results-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .hero { padding: 40px 20px 24px; }
  .category-tabs { justify-content: flex-start; flex-wrap: nowrap; }
  .quiz-container { padding: 12px 16px 60px; }
  .quiz-header { margin-bottom: 14px; }
  .question-text { font-size: 19px; margin-bottom: 16px; }
  .answers-grid { gap: 6px; }
  .explanation { font-size: 14px; padding: 10px 14px; margin-top: 10px; }
  .next-btn { margin-top: 10px; padding: 13px; font-size: 15px; }
}

/* Utility */
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }