:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --danger-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --dark-bg: #0f0f23;
  --card-bg: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --text-primary: #ffffff;
  --text-secondary: #b8bcc8;
  --accent-blue: #00d4ff;
  --accent-purple: #7c3aed;
  --border-radius: 20px;
  --shadow-light: 0 8px 32px rgba(31, 38, 135, 0.37);
  --shadow-heavy: 0 15px 35px rgba(0, 0, 0, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--dark-bg);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 80%,
      rgba(120, 119, 198, 0.3) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(255, 119, 198, 0.3) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 40% 40%,
      rgba(120, 219, 255, 0.2) 0%,
      transparent 50%
    );
  z-index: -1;
  animation: backgroundShift 10s ease-in-out infinite alternate;
}

@keyframes backgroundShift {
  0% {
    transform: translateX(-10px) translateY(-10px);
  }

  100% {
    transform: translateX(10px) translateY(10px);
  }
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 2rem;
  background: rgba(15, 15, 35, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(15, 15, 35, 0.95);
  box-shadow: var(--shadow-light);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo i {
  font-size: 2rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
}

.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  position: relative;
}

.hero-content {
  max-width: 1200px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-text {
  z-index: 2;
}

.hero-badge {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.5rem 1rem;
  border-radius: 25px;
  font-size: 0.9rem;
  color: var(--accent-blue);
  margin-bottom: 1.5rem;
  display: inline-block;
  animation: fadeInUp 0.8s ease-out;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #ffffff 0%, #667eea 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.btn-hero {
  padding: 1rem 2rem;
  font-size: 1.1rem;
  border-radius: 15px;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.floating-cards {
  position: relative;
  width: 400px;
  height: 400px;
}

.floating-card {
  position: absolute;
  width: 200px;
  height: 120px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-light);
  animation: float 6s ease-in-out infinite;
}

.floating-card:nth-child(1) {
  top: 0;
  left: 0;
  animation-delay: 0s;
}

.floating-card:nth-child(2) {
  top: 0;
  right: 0;
  animation-delay: 2s;
}

.floating-card:nth-child(3) {
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  animation-delay: 4s;
}

.card-icon {
  font-size: 2rem;
  background: var(--secondary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

  50% {
    transform: translateY(-20px) rotate(5deg);
  }
}

.quiz-container {
  display: none;
  min-height: 100vh;
  padding: 6rem 2rem 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.quiz-header {
  text-align: center;
  margin-bottom: 3rem;
  animation: slideInDown 0.8s ease-out;
}

.quiz-progress {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
}

.progress-bar {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  height: 8px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--success-gradient);
  border-radius: 10px;
  transition: width 0.5s ease;
}

.progress-text {
  text-align: center;
  font-weight: 600;
}

.timer-display {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--accent-blue);
}

.quiz-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: 2.5rem;
  box-shadow: var(--shadow-heavy);
  animation: slideInUp 0.8s ease-out;
}

.question-number {
  color: var(--accent-purple);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.question-text {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
  line-height: 1.4;
}

.options-container {
  display: grid;
  gap: 1rem;
  margin-bottom: 2rem;
}

.option {
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}

.option::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  transition: left 0.5s;
}

.option:hover::before {
  left: 100%;
}

.option:hover {
  border-color: var(--accent-blue);
  background: rgba(0, 212, 255, 0.1);
  transform: translateY(-2px);
}

.option.selected {
  border-color: var(--accent-purple);
  background: rgba(124, 58, 237, 0.2);
}

.option.correct {
  border-color: #10b981;
  background: rgba(16, 185, 129, 0.2);
}

.option.incorrect {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.2);
}

.option-letter {
  width: 35px;
  height: 35px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: white;
  flex-shrink: 0;
}

.option-text {
  font-size: 1.1rem;
  flex: 1;
}

.quiz-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.score-display {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-blue);
}

.results-container {
  display: none;
  min-height: 100vh;
  padding: 6rem 2rem 2rem;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.results-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: 3rem;
  box-shadow: var(--shadow-heavy);
  animation: zoomIn 0.8s ease-out;
}

.results-icon {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  background: var(--success-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.results-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.results-score {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.results-percentage {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: var(--success-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.results-message {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  color: var(--text-secondary);
}

.results-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.info-sections {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.info-section {
  margin-bottom: 4rem;
  text-align: center;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: left;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.05),
    transparent
  );
  transition: left 0.8s;
}

.feature-card:hover::before {
  left: 100%;
}

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

.feature-icon {
  font-size: 2.5rem;
  background: var(--secondary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer {
  background: rgba(15, 15, 35, 0.9);
  backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 1rem;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

  .floating-cards {
    width: 300px;
    height: 300px;
  }

  .floating-card {
    width: 150px;
    height: 100px;
    padding: 1rem;
  }

  .quiz-progress {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 1rem;
  }

  .quiz-card {
    padding: 1.5rem;
  }

  .question-text {
    font-size: 1.2rem;
  }

  .results-card {
    padding: 2rem;
  }

  .results-title {
    font-size: 2rem;
  }

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

.hidden {
  display: none !important;
}

.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }

  100% {
    opacity: 1;
  }
}