:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #12122a;
  --bg-card: #1a1a3a;
  --fg-primary: #f0f0ff;
  --fg-secondary: #a0a0c0;
  --fg-muted: #606080;
  --accent-purple: #8b5cf6;
  --accent-blue: #3b82f6;
  --accent-sky: #0ea5e9;
  --accent-cyan: #06b6d4;
  --gradient-start: #7c3aed;
  --gradient-mid: #3b82f6;
  --gradient-end: #0ea5e9;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --border: rgba(139, 92, 246, 0.2);
  --glow: rgba(139, 92, 246, 0.3);
}

[data-theme="light"] {
  --bg-primary: #f8faff;
  --bg-secondary: #eef2ff;
  --bg-card: #ffffff;
  --fg-primary: #1a1a2e;
  --fg-secondary: #4a4a6a;
  --fg-muted: #8a8aa0;
  --border: rgba(139, 92, 246, 0.15);
  --glow: rgba(139, 92, 246, 0.1);
}

[data-high-contrast="true"] {
  --fg-primary: #000000;
  --fg-secondary: #222222;
  --bg-primary: #ffffff;
  --bg-secondary: #f0f0f0;
  --bg-card: #ffffff;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", sans-serif;
  background: var(--bg-primary);
  color: var(--fg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  transition:
    background 0.3s ease,
    color 0.3s ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Space Grotesk", sans-serif;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

[data-reduced-motion="true"] *,
[data-reduced-motion="true"] *::before,
[data-reduced-motion="true"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent-purple), var(--accent-sky));
  border-radius: 4px;
}

/* App Container */
.app-container {
  min-height: 100vh;
  position: relative;
}

/* Animated Background */
.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: blobFloat 20s ease-in-out infinite;
}

.bg-blob-1 {
  width: 600px;
  height: 600px;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid)
  );
  top: -200px;
  left: -200px;
  animation-delay: 0s;
}

.bg-blob-2 {
  width: 500px;
  height: 500px;
  background: linear-gradient(135deg, var(--gradient-mid), var(--gradient-end));
  bottom: -150px;
  right: -150px;
  animation-delay: -5s;
}

.bg-blob-3 {
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-sky));
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -10s;
}

@keyframes blobFloat {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  25% {
    transform: translate(30px, -30px) scale(1.1);
  }

  50% {
    transform: translate(-20px, 20px) scale(0.95);
  }

  75% {
    transform: translate(20px, 30px) scale(1.05);
  }
}

/* Page transitions */
.page {
  display: none;
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.4s ease,
    transform 0.4s ease;
  position: relative;
  z-index: 1;
}

.page.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

/* Splash Screen */
#splash-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
}

.splash-logo {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 700;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid),
    var(--gradient-end)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: logoReveal 1s ease-out forwards;
}

.splash-tagline {
  color: var(--fg-secondary);
  font-size: clamp(0.9rem, 3vw, 1.2rem);
  margin-top: 1rem;
  opacity: 0;
  animation: fadeSlideUp 0.6s ease-out 0.5s forwards;
}

.splash-loader {
  margin-top: 3rem;
  width: 200px;
  height: 4px;
  background: var(--bg-card);
  border-radius: 2px;
  overflow: hidden;
  opacity: 0;
  animation: fadeSlideUp 0.6s ease-out 0.8s forwards;
}

.splash-loader-bar {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--gradient-start),
    var(--gradient-mid),
    var(--gradient-end)
  );
  border-radius: 2px;
  animation: loadingProgress 2s ease-out 1s forwards;
}

@keyframes logoReveal {
  0% {
    opacity: 0;
    transform: scale(0.8);
  }

  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes fadeSlideUp {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes loadingProgress {
  0% {
    width: 0%;
  }

  100% {
    width: 100%;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: 12px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn:focus-visible {
  outline: 3px solid var(--accent-sky);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid)
  );
  color: white;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--fg-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent-purple);
  background: rgba(139, 92, 246, 0.1);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid var(--error);
}

.btn-danger:hover {
  background: var(--error);
  color: white;
}

.btn-large {
  padding: 1.25rem 3rem;
  font-size: 1.1rem;
  border-radius: 16px;
}

.btn-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 12px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem;
  transition: all 0.3s ease;
}

.card:hover {
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: 0 8px 40px rgba(139, 92, 246, 0.1);
}

.card-glass {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* Form elements */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--fg-secondary);
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 12px;
  color: var(--fg-primary);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.form-input::placeholder {
  color: var(--fg-muted);
}

/* Progress bar */
.progress-bar {
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--gradient-start),
    var(--gradient-mid),
    var(--gradient-end)
  );
  border-radius: 4px;
  transition: width 0.5s ease;
}

/* XP Badge */
.xp-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(
    135deg,
    rgba(139, 92, 246, 0.2),
    rgba(14, 165, 233, 0.2)
  );
  border: 1px solid var(--border);
  border-radius: 20px;
  font-weight: 600;
  color: var(--fg-primary);
}

.xp-value {
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-end)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Level Badge */
.level-badge {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid)
  );
  color: white;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
  position: relative;
}

.level-badge::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-end)
  );
  z-index: -1;
  animation: levelPulse 2s ease-in-out infinite;
}

@keyframes levelPulse {
  0%,
  100% {
    opacity: 0.5;
    transform: scale(1);
  }

  50% {
    opacity: 0.2;
    transform: scale(1.1);
  }
}

/* Streak Flame */
.streak-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: 20px;
}

.streak-flame {
  font-size: 1.25rem;
  animation: flameFlicker 0.5s ease-in-out infinite alternate;
}

@keyframes flameFlicker {
  0% {
    transform: scale(1) rotate(-5deg);
  }

  100% {
    transform: scale(1.1) rotate(5deg);
  }
}

/* Navigation */
.nav-bottom {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-around;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--fg-muted);
}

.nav-item:hover,
.nav-item.active {
  color: var(--fg-primary);
  background: rgba(139, 92, 246, 0.1);
}

.nav-item.active {
  color: var(--accent-purple);
}

.nav-item svg {
  width: 24px;
  height: 24px;
}

.nav-item span {
  font-size: 0.75rem;
  font-weight: 500;
}

/* Chat interface */
.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 200px);
  max-width: 800px;
  margin: 0 auto;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chat-message {
  max-width: 85%;
  padding: 1rem 1.25rem;
  border-radius: 16px;
  animation: messageSlide 0.3s ease;
}

@keyframes messageSlide {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.chat-message.user {
  align-self: flex-end;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid)
  );
  color: white;
  border-bottom-right-radius: 4px;
}

.chat-message.ai {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.chat-input-container {
  padding: 1rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  display: flex;
  gap: 0.75rem;
}

.chat-input {
  flex: 1;
  padding: 1rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 16px;
  color: var(--fg-primary);
  font-size: 1rem;
  resize: none;
}

.chat-input:focus {
  outline: none;
  border-color: var(--accent-purple);
}

/* Quiz styles */
.quiz-option {
  width: 100%;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 16px;
  text-align: left;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--fg-primary);
  font-size: 1rem;
}

.quiz-option:hover {
  border-color: var(--accent-purple);
  background: rgba(139, 92, 246, 0.1);
}

.quiz-option.selected {
  border-color: var(--accent-purple);
  background: rgba(139, 92, 246, 0.2);
}

.quiz-option.correct {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.2);
}

.quiz-option.incorrect {
  border-color: var(--error);
  background: rgba(239, 68, 68, 0.2);
}

/* Reward Card */
.reward-card {
  position: relative;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.reward-card.locked {
  opacity: 0.6;
}

.reward-card.unlocked {
  border-color: var(--success);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.2);
}

.reward-card.unlocked::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(
    from 0deg,
    transparent,
    rgba(16, 185, 129, 0.1),
    transparent 30%
  );
  animation: rewardShine 3s linear infinite;
}

@keyframes rewardShine {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

/* Certificate */
.certificate-preview {
  background: linear-gradient(135deg, #1a1a3a, #2a2a4a);
  border: 3px solid;
  border-image: linear-gradient(
      135deg,
      var(--gradient-start),
      var(--gradient-mid),
      var(--gradient-end)
    )
    1;
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.certificate-preview::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%239C92AC' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

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

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 2rem;
  max-width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

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

/* Toast notifications */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: toastSlide 0.3s ease;
  max-width: 350px;
}

@keyframes toastSlide {
  0% {
    opacity: 0;
    transform: translateX(100px);
  }

  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast.success {
  border-color: var(--success);
}

.toast.warning {
  border-color: var(--warning);
}

.toast.error {
  border-color: var(--error);
}

/* Accessibility */
.accessibility-panel {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  max-width: 100vw;
  height: 100vh;
  background: var(--bg-card);
  border-left: 1px solid var(--border);
  z-index: 1001;
  transition: right 0.3s ease;
  padding: 2rem;
  overflow-y: auto;
}

.accessibility-panel.open {
  right: 0;
}

.toggle-switch {
  position: relative;
  width: 56px;
  height: 28px;
  background: var(--bg-secondary);
  border-radius: 14px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.toggle-switch.active {
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid)
  );
}

.toggle-switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  background: white;
  border-radius: 50%;
  transition: transform 0.3s ease;
}

.toggle-switch.active::after {
  transform: translateX(28px);
}

/* Voice indicator */
.voice-indicator {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.voice-indicator.listening {
  animation: voicePulse 1s ease-in-out infinite;
}

.voice-indicator.listening::before {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  background: rgba(139, 92, 246, 0.3);
  animation: voiceRing 1s ease-out infinite;
}

@keyframes voicePulse {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.1);
  }
}

@keyframes voiceRing {
  0% {
    transform: scale(1);
    opacity: 1;
  }

  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

/* Typing animation */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 1rem;
}

.typing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fg-muted);
  animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-dot:nth-child(1) {
  animation-delay: 0s;
}

.typing-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typingBounce {
  0%,
  60%,
  100% {
    transform: translateY(0);
  }

  30% {
    transform: translateY(-10px);
  }
}

/* Confetti */
.confetti-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3000;
  overflow: hidden;
}

.confetti {
  position: absolute;
  width: 10px;
  height: 10px;
  top: -10px;
  animation: confettiFall 3s linear forwards;
}

@keyframes confettiFall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }

  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

/* Anti-cheat overlay */
.anti-cheat-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(239, 68, 68, 0.9);
  z-index: 4000;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.anti-cheat-overlay.active {
  display: flex;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-bottom {
    padding: 0.5rem;
  }

  .nav-item {
    padding: 0.5rem 0.75rem;
  }

  .card {
    padding: 1rem;
  }

  .btn-large {
    padding: 1rem 2rem;
  }

  .certificate-preview {
    padding: 1.5rem;
  }

  .accessibility-panel {
    width: 100%;
    right: -100%;
  }
}

/* Large fonts mode */
[data-large-fonts="true"] {
  font-size: 120%;
}

[data-large-fonts="true"] .btn {
  padding: 1.25rem 2.25rem;
}

/* Eye comfort mode */
[data-eye-comfort="true"] {
  filter: brightness(0.9) saturate(0.9);
}

/* Stats grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.stat-card {
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  text-align: center;
}

.stat-value {
  font-family: "Space Grotesk", sans-serif;
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-end)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  color: var(--fg-secondary);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Topic card */
.topic-card {
  padding: 1.25rem;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.topic-card:hover {
  border-color: var(--accent-purple);
  transform: translateX(4px);
}

.topic-progress {
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  margin-top: 1rem;
  overflow: hidden;
}

.topic-progress-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--gradient-start),
    var(--gradient-end)
  );
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* Leaderboard */
.leaderboard-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 0.5rem;
  transition: all 0.3s ease;
}

.leaderboard-item:hover {
  border-color: var(--accent-purple);
}

.leaderboard-rank {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  background: var(--bg-secondary);
}

.leaderboard-item:nth-child(1) .leaderboard-rank {
  background: linear-gradient(135deg, #ffd700, #ffb800);
  color: #000;
}

.leaderboard-item:nth-child(2) .leaderboard-rank {
  background: linear-gradient(135deg, #c0c0c0, #a0a0a0);
  color: #000;
}

.leaderboard-item:nth-child(3) .leaderboard-rank {
  background: linear-gradient(135deg, #cd7f32, #b8702c);
  color: #fff;
}

/* Header */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

/* Lesson content */
.lesson-content {
  line-height: 1.8;
  font-size: 1.1rem;
}

.lesson-content h3 {
  margin: 1.5rem 0 1rem;
  color: var(--fg-primary);
}

.lesson-content p {
  margin-bottom: 1rem;
  color: var(--fg-secondary);
}

.lesson-content code {
  background: var(--bg-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-family: monospace;
}

.lesson-content pre {
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: 12px;
  overflow-x: auto;
  margin: 1rem 0;
}

/* Grid patterns */
.grid-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(139, 92, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* Floating elements */
.floating-icon {
  position: absolute;
  opacity: 0.1;
  animation: float 6s ease-in-out infinite;
}

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

  50% {
    transform: translateY(-20px) rotate(10deg);
  }
}

/* Glow effect */
.glow-effect {
  position: relative;
}

.glow-effect::before {
  content: "";
  position: absolute;
  inset: -2px;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid),
    var(--gradient-end)
  );
  border-radius: inherit;
  z-index: -1;
  filter: blur(20px);
  opacity: 0.5;
  transition: opacity 0.3s ease;
}

.glow-effect:hover::before {
  opacity: 0.8;
}

/* Screen reader only */
.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;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-purple);
  color: white;
  padding: 8px 16px;
  z-index: 10000;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 0;
}

/* Level progress */
.level-progress-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border);
}

.level-progress-bar {
  flex: 1;
  height: 12px;
  background: var(--bg-secondary);
  border-radius: 6px;
  overflow: hidden;
}

.level-progress-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--gradient-start),
    var(--gradient-mid),
    var(--gradient-end)
  );
  border-radius: 6px;
  transition: width 0.5s ease;
  position: relative;
}

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

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

  100% {
    transform: translateX(100%);
  }
}

/* Daily streak calendar */
.streak-calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.5rem;
}

.streak-day {
  aspect-ratio: 1;
  border-radius: 8px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.streak-day.completed {
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-mid)
  );
  color: white;
}

.streak-day.today {
  border: 2px solid var(--accent-purple);
}

/* Achievement badge */
.achievement-badge {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 3px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.achievement-badge.earned {
  border-color: var(--success);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.achievement-badge.earned::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px dashed var(--success);
  animation: rotate 10s linear infinite;
}

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

  to {
    transform: rotate(360deg);
  }
}

/* Test timer */
.test-timer {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 12px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.test-timer.warning {
  border-color: var(--warning);
  color: var(--warning);
  animation: timerPulse 1s ease-in-out infinite;
}

@keyframes timerPulse {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

/* Career path card */
.career-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 20px;
  transition: all 0.3s ease;
}

.career-card.recommended {
  border-color: var(--success);
  position: relative;
}

.career-card.recommended::before {
  content: "Recommended";
  position: absolute;
  top: -12px;
  left: 20px;
  background: var(--success);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* Referral code box */
.referral-box {
  padding: 1.5rem;
  background: var(--bg-secondary);
  border: 2px dashed var(--accent-purple);
  border-radius: 16px;
  text-align: center;
}

.referral-code {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-purple);
  margin: 1rem 0;
}

/* Main content area */
.main-content {
  padding-bottom: 100px;
  min-height: 100vh;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Animation delays */
.delay-100 {
  animation-delay: 0.1s;
}

.delay-200 {
  animation-delay: 0.2s;
}

.delay-300 {
  animation-delay: 0.3s;
}

.delay-400 {
  animation-delay: 0.4s;
}

.delay-500 {
  animation-delay: 0.5s;
}

/* Fade in animations */
.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.fade-in-up {
  animation: fadeSlideUp 0.5s ease forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.stagger-1 {
  animation-delay: 0.1s;
  opacity: 0;
  animation: fadeSlideUp 0.5s ease forwards;
}

.stagger-2 {
  animation-delay: 0.2s;
  opacity: 0;
  animation: fadeSlideUp 0.5s ease forwards;
}

.stagger-3 {
  animation-delay: 0.3s;
  opacity: 0;
  animation: fadeSlideUp 0.5s ease forwards;
}

.stagger-4 {
  animation-delay: 0.4s;
  opacity: 0;
  animation: fadeSlideUp 0.5s ease forwards;
}

.stagger-5 {
  animation-delay: 0.5s;
  opacity: 0;
  animation: fadeSlideUp 0.5s ease forwards;
}
.toast.exit { animation: toastSlideOut 0.3s ease forwards; } @keyframes toastSlideOut { 0% { opacity: 1; transform: translateX(0); } 100% { opacity: 0; transform: translateX(100px); } }