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

html {
  background: #0e3556;
}

body, html {
  font-family: "DM Mono", "Monaco", "Menlo", "Ubuntu Mono", monospace;
  background: linear-gradient(135deg, #113f67 0%, #0e3556 100%);
  color: #030303;
  line-height: 1.6;
  min-height: 100vh;
}

/* Splash Screen Styles */
.splash-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #113f67 0%, #0e3556 100%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 1;
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.splash-screen.hidden {
  opacity: 0;
  transform: scale(1.1);
  pointer-events: none;
}

.splash-content {
  text-align: center;
  color: white;
  max-width: 600px;
  padding: 0 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.splash-title {
  font-size: 4.5em;
  font-weight: 700;
  margin-bottom: 20px;
  text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.4);
  animation: splashFadeInUp 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0;
  animation-fill-mode: forwards;
}

.splash-subtitle {
  font-size: 1.4em;
  margin-bottom: 15px;
  opacity: 0.95;
  animation: splashFadeInUp 1.2s cubic-bezier(0.4, 0, 0.2, 1) 0.3s;
  opacity: 0;
  animation-fill-mode: forwards;
}

.splash-note {
  font-size: 1em;
  margin-bottom: 40px;
  opacity: 0.8;
  font-style: italic;
  animation: splashFadeInUp 1.2s cubic-bezier(0.4, 0, 0.2, 1) 0.6s;
  opacity: 0;
  animation-fill-mode: forwards;
}

.start-quiz-btn {
  background: rgba(255, 255, 255, 0.15);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
  padding: 18px 36px;
  font-size: 1.3em;
  font-weight: 700;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  animation: splashFadeInUp 1.2s cubic-bezier(0.4, 0, 0.2, 1) 0.9s;
  opacity: 0;
  animation-fill-mode: forwards;
  position: relative;
  overflow: hidden;
}

.start-quiz-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;
}

.start-quiz-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.start-quiz-btn:hover::before {
  left: 100%;
}

.start-quiz-btn:active {
  transform: translateY(-1px) scale(1.02);
}

.splash-footer {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9em;
  text-align: center;
  padding: 20px;
  margin-top: auto;
  animation: splashFadeInUp 1.2s cubic-bezier(0.4, 0, 0.2, 1) 1.2s;
  opacity: 0;
  animation-fill-mode: forwards;
}

.splash-footer a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  transition: color 0.3s ease;
}

.splash-footer a:hover {
  color: white;
  text-decoration: underline;
}

#main-content {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

#main-content.show {
  opacity: 1;
  transform: translateY(0);
}

pre,
code,
button {
  font-family: "DM Mono", "Monaco", "Menlo", "Ubuntu Mono", monospace;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
  color: white;
  position: relative;
}

header h1 {
  font-size: 3em;
  margin-bottom: 10px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 0.8s ease-out;
}

header p {
  font-size: 1.2em;
  opacity: 0.9;
}

.help-icon {
  position: fixed;
  top: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.15);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1500;
}

.help-icon:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.help-icon:active {
  transform: translateY(0) scale(1.02);
}

.quiz-container {
  background: white;
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  animation: fadeInUp 0.6s ease-out;
  transform: translateY(0);
}

.question-info {
  position: relative;
  margin-bottom: 20px;
  font-weight: bold;
  color: #113f67;
  animation: fadeInUp 0.5s ease-out;
  border-radius: 12px;
  overflow: hidden;
  background: #f8f9fa;
  border: 2px solid #e9ecef;
}

.progress-bar-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #f8f9fa;
  z-index: 1;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(135deg, #5e936c 0%, #7ba888 50%, #5e936c 100%);
  background-size: 200% 100%;
  animation: shimmerProgress 3s ease-in-out infinite;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.progress-bar::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: progressShine 2s ease-in-out infinite;
}

.question-info-content {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.score span {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.score-flip-container {
  display: inline-block;
  position: relative;
  overflow: hidden;
  height: 1em;
  width: 1.2em;
  text-align: right;
}

.score-digit {
  display: block;
  position: absolute;
  width: 100%;
  height: 100%;
  line-height: 1.3em;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.score-digit.flip-out {
  transform: translateY(-100%);
}

.score-digit.flip-in {
  transform: translateY(100%);
  animation: flipIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes flipIn {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

.question-section {
  margin-bottom: 20px;
  animation: fadeInUp 0.6s ease-out;
  transition: opacity 0.3s ease-out;
}

.code-example {
  background: linear-gradient(135deg, #113f67 0%, #0e3556 100%);
  border: none;
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 20px;
  overflow-x: auto;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.1);
}

.code-example pre {
  margin: 0;
  font-family: "Space Mono", "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 1em;
  line-height: 1.4;
  color: white;
}

.question-text {
  font-size: 1em;
  color: #030303;
}

.answers-section {
  margin-bottom: 30px;
  transition: opacity 0.3s ease-out;
}

.answer-btn {
  display: block;
  width: 100%;
  padding: 15px;
  margin-bottom: 10px;
  border: 2px solid #ddd;
  border-radius: 8px;
  background: white;
  color: #030303;
  font-size: 1em;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: left;
  white-space: pre;
  animation: slideInLeft 0.4s ease-out;
  animation-fill-mode: both;
  transform: translateX(0);
  position: relative;
  overflow: hidden;
}

.answer-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(17, 63, 103, 0.1),
    transparent
  );
  transition: left 0.5s;
}

.answer-btn:nth-child(1) {
  animation-delay: 0.1s;
}
.answer-btn:nth-child(2) {
  animation-delay: 0.2s;
}
.answer-btn:nth-child(3) {
  animation-delay: 0.3s;
}
.answer-btn:nth-child(4) {
  animation-delay: 0.4s;
}

.shortcut-key {
  display: inline-block;
  background: #113f67;
  color: white;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.8em;
  font-weight: bold;
  margin-right: 8px;
  min-width: 18px;
  text-align: center;
}


.answer-btn.correct {
  background: #5e936c;
  color: white;
  border-color: #5e936c;
}

.answer-btn.wrong {
  background: #dc3c22;
  color: white;
  border-color: #dc3c22;
}

.answer-btn.disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.answer-btn.selected {
  background: #e8f4fd;
  border-color: #113f67;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(17, 63, 103, 0.2);
}

.answer-btn:focus {
  outline: none;
}

.explanation-section {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 0 15px;
  margin-bottom: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-20px);
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1),
    max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.explanation-section.show {
  padding: 15px;
  margin-bottom: 20px;
  max-height: none;
  opacity: 1;
  transform: translateY(0);
}

.explanation-text {
  font-size: 1em;
  color: #030303;
}

.navigation {
  text-align: center;
}

.nav-btn {
  background: #113f67;
  color: white;
  border: none;
  padding: 12px 24px;
  font-size: 1.1em;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  margin: 0 10px;
  transform: translateY(0);
  position: relative;
  overflow: hidden;
}

.nav-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;
}

.nav-btn:hover {
  background: #0e3556;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(17, 63, 103, 0.3);
}

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

.nav-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.final-score {
  background: white;
  border-radius: 15px;
  padding: 40px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  animation: fadeInScale 0.8s ease-out;
}

.final-score h2 {
  color: #113f67;
  margin-bottom: 20px;
  font-size: 2.5em;
}

.final-score p {
  font-size: 1.3em;
  margin-bottom: 15px;
}

#final-score-value {
  font-weight: bold;
  color: #5e936c;
}

#score-message {
  color: #113f67;
  font-weight: bold;
  font-size: 1.1em;
}

.social-sharing {
  margin: 30px 0 20px 0;
  padding: 20px 0;
  border-top: 1px solid #eee;
  border-bottom: 1px solid #eee;
}

.sharing-label {
  color: #666;
  font-size: 1em;
  margin-bottom: 15px;
  font-weight: normal;
}

.social-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.social-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  font-family: "Space Mono", monospace;
  font-size: 0.9em;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  color: white;
}

.twitter-btn {
  background: #1da1f2;
}

.twitter-btn:hover {
  background: #0d8bd9;
  transform: translateY(-1px);
}

.bluesky-btn {
  background: #0085ff;
}

.bluesky-btn:hover {
  background: #0066cc;
  transform: translateY(-1px);
}

.social-btn svg {
  flex-shrink: 0;
}

/* Animations */
@keyframes splashFadeInUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes correctPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(94, 147, 108, 0.7);
  }
  50% {
    transform: scale(1.02);
    box-shadow: 0 0 0 10px rgba(94, 147, 108, 0);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(94, 147, 108, 0);
  }
}

@keyframes wrongPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(220, 60, 34, 0.7);
  }
  50% {
    transform: scale(1.02);
    box-shadow: 0 0 0 10px rgba(220, 60, 34, 0);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(220, 60, 34, 0);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes shimmerProgress {
  0% {
    background-position: -200% 0;
  }
  50% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

@keyframes progressShine {
  0% {
    left: -100%;
  }
  50% {
    left: 100%;
  }
  100% {
    left: 100%;
  }
}

/* Responsive design */
@media (max-width: 600px) {
  .container {
    padding: 10px;
  }

  header {
    margin-bottom: 10px;
  }

  header h1 {
    font-size: 1.7em;
    margin-bottom: 0;
  }

  .help-icon {
    top: 12px;
    right: 12px;
  }

  .quiz-container {
    padding: 20px;
  }

  .question-info-content {
    flex-direction: column;
    gap: 10px;
    text-align: center;
    padding: 12px 15px;
  }

  .splash-title {
    font-size: 3em;
  }

  .splash-subtitle {
    font-size: 1.2em;
  }

  .start-quiz-btn {
    padding: 15px 30px;
    font-size: 1.1em;
  }

  .splash-footer {
    font-size: 0.8em;
    padding: 15px;
  }

  .help-icon {
    width: 36px;
    height: 36px;
  }

  .help-popover-content {
    margin: 15px;
    max-width: calc(100vw - 30px);
  }

  /* Move navigation above answers and make buttons smaller */
  .quiz-container {
    display: flex;
    flex-direction: column;
  }

  .explanation-section {
    order: 1;
  }

  .navigation {
    order: 2;
    margin-bottom: 20px;
  }

  .answers-section {
    order: 3;
  }

  .nav-btn {
    padding: 8px 16px;
    font-size: 0.9em;
    margin: 0 5px;
  }
}

/* Help Popover Styles */
.help-popover {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.help-popover.show {
  opacity: 1;
}

.help-popover-content {
  background: white;
  border-radius: 15px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  max-width: 700px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.help-popover.show .help-popover-content {
  transform: scale(1) translateY(0);
}

.help-popover-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 25px 15px 25px;
  border-bottom: 1px solid #eee;
}

.help-popover-header h3 {
  color: #113f67;
  font-size: 1.4em;
  margin: 0;
  font-weight: 600;
}

.help-close {
  background: none;
  border: none;
  color: #666;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.help-close:hover {
  background: #f5f5f5;
  color: #333;
}

.help-popover-body {
  padding: 20px 25px 25px 25px;
}

.help-popover-body ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.help-popover-body li {
  margin-bottom: 16px;
  color: #333;
  line-height: 1.5;
  padding-left: 20px;
  position: relative;
}

.help-popover-body li:last-child {
  margin-bottom: 0;
}

.help-popover-body li::before {
  content: "•";
  color: #113f67;
  font-weight: bold;
  position: absolute;
  left: 0;
  top: 0;
}

.help-popover-body a {
  color: #113f67;
  text-decoration: underline;
  transition: color 0.2s ease;
}

.help-popover-body a:hover {
  color: #0e3556;
}

/* Continue Dialog Styles */
.continue-dialog-buttons {
  display: flex;
  gap: 16px;
  margin-top: 20px;
  justify-content: center;
}