:root {
  --background-dark: #2c3e50;
  --background-card: #34495e;
}

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

body {
  font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono",
    "Liberation Mono", Menlo, Consolas, "Courier New", monospace;
  line-height: 1.6;
  color: #ecf0f1;
  background: var(--background-dark);
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2rem;
}

.content-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 2rem;
}

.card {
  background: var(--background-card);
  border-radius: 8px;
  border: 1px solid #4a5568;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  padding: 2rem;
}

.card-elevated {
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.4);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-elevated:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.4);
}

.card-rounded {
  border-radius: 12px;
}

.navigation {
  background: var(--background-dark);
  padding: 2rem 0;
}

.nav-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--background-card);
  border-radius: 12px;
  border: 1px solid #4a5568;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.nav-logo h1 {
  font-family: "Pacifico", cursive;
  color: #f1c40f;
  font-size: 1.8rem;
  font-weight: 400;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: #ecf0f1;
  text-decoration: none;
  font-weight: 400;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: #f1c40f;
}

.main-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.content-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section {
  background: var(--background-card);
  padding: 2rem;
  border-radius: 8px;
  border: 1px solid #4a5568;
  margin-bottom: 1.5rem;
}

.section-intro {
  border: 2px solid #f1c40f;
  background: var(--background-card);
}

.section-theory {
  background: var(--background-card);
  border: 1px solid #4a5568;
}

.section-solutions {
  background: #34495e;
  border: 2px solid #e67e22;
}

.image-container {
  max-width: 400px;
  width: 100%;
  margin: 1rem auto 1.5rem auto;
  border-radius: 16px;
  overflow: hidden;
  border: 4px solid #e67e22;
  background: var(--background-card);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-container:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.4);
}

.image-container-small {
  max-width: 300px;
}

.image-container-large {
  max-width: 500px;
}

.section-image {
  width: 100%;
  height: auto;
  display: block;
}

.content-with-image {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.content-text {
  flex: 1;
  max-width: 100%;
}

h1,
h2,
h3 {
  color: #ecf0f1;
  margin-bottom: 1rem;
}

.heading-primary {
  font-family: "Pacifico", cursive;
  font-size: 2rem;
  font-weight: 400;
  color: #f1c40f;
  text-align: center;
  margin: 2rem 0 1.5rem 0;
  padding-left: 1rem;
  border-left: 3px solid #e67e22;
}

.heading-secondary {
  font-family: "Pacifico", cursive;
  font-size: 1.5rem;
  font-weight: 400;
  color: #f1c40f;
  margin-top: 2rem;
  margin-bottom: 1rem;
  text-align: center;
}

.text-body {
  color: #ecf0f1;
  line-height: 1.6;
}

.text-accent {
  color: #e67e22;
  font-weight: 600;
}

.image-attribution {
  font-size: 0.75rem;
  font-style: italic;
  color: #bdc3c7;
  text-align: center;
  margin-top: 0.3rem;
  margin-bottom: 1rem;
}

/*~~~ Lists ~~~*/
.list {
  margin-left: 1.5rem;
}

.list-item {
  margin-bottom: 0.5rem;
  color: #ecf0f1;
  line-height: 1.6;
}

.list-spaced .list-item {
  margin-bottom: 1rem;
}

/*~~~ Footer ~~~*/
.footer {
  background: var(--background-dark);
  padding: 3rem 0;
}

.footer-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-card {
  background: var(--background-card);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid #4a5568;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  text-align: center;
}

.footer-text {
  color: #bdc3c7;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.footer-text-primary {
  color: #f1c40f;
  font-weight: 600;
  margin-bottom: 1rem;
}

/*~~~ Books Page Styling ~~~*/
.nav-active {
  color: #f1c40f !important;
  font-weight: 600;
}

.search-container {
  background: var(--background-card);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid #4a5568;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  display: flex;
  gap: 1rem;
  align-items: center;
}

.search-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 2px solid #4a5568;
  border-radius: 8px;
  background: var(--background-dark);
  color: #ecf0f1;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.search-input:focus {
  outline: none;
  border-color: #f1c40f;
}

.search-input::placeholder {
  color: #bdc3c7;
}

.search-button {
  padding: 0.75rem 1.5rem;
  background: #e67e22;
  color: white;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

.search-button:hover {
  background: #d35400;
  transform: translateY(-2px);
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 1rem;
  align-items: start; /* Prevents stretching cards to equal height */
}

.book-card {
  background: var(--background-card);
  border-radius: 12px;
  border: 1px solid #4a5568;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  padding: 1.5rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
  word-wrap: break-word;
  hyphens: auto;
}

.book-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.4);
}

.book-header {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.book-cover {
  width: 80px;
  height: 120px;
  object-fit: cover;
  border-radius: 8px;
  border: 2px solid #4a5568;
  background: var(--background-dark);
  flex-shrink: 0;
}

.book-info {
  flex: 1;
  min-width: 0; /* Allows flex item to shrink below content size */
  overflow: hidden;
}

.book-title {
  color: #f1c40f;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.3;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.book-author {
  color: #e67e22;
  font-weight: 500;
  margin-bottom: 0.25rem;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.book-year {
  color: #bdc3c7;
  font-size: 0.9rem;
}

.book-description {
  color: #ecf0f1;
  line-height: 1.5;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.curator-note {
  background: rgba(241, 196, 15, 0.1);
  border-left: 3px solid #f1c40f;
  padding: 0.75rem;
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
}

.curator-note-title {
  color: #f1c40f;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.curator-note-text {
  color: #ecf0f1;
  font-size: 0.9rem;
  line-height: 1.4;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.book-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.book-link {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.3s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

.book-link--primary {
  background: #3498db;
  color: white;
}

.book-link--primary:hover {
  background: #2980b9;
}

.book-link--secondary {
  background: transparent;
  border: 1px solid #4a5568;
  color: #ecf0f1;
}

.book-link--secondary:hover {
  border-color: #f1c40f;
  color: #f1c40f;
}

.loading-state {
  text-align: center;
  padding: 3rem;
}

.error-message {
  background: rgba(231, 76, 60, 0.1);
  border: 1px solid #e74c3c;
  border-radius: 8px;
  padding: 1rem;
  color: #e74c3c;
  text-align: center;
}

.mb-md {
  margin-bottom: 1rem;
}

/*~~~ Quiz Styling ~~~*/
.quiz-stats {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-label {
  display: block;
  color: #bdc3c7;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.stat-value {
  color: #f1c40f;
  font-size: 1.2rem;
  font-weight: 600;
}

.quiz-button {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.quiz-button--primary {
  background: #e67e22;
  color: white;
}

.quiz-button--primary:hover {
  background: #d35400;
  transform: translateY(-2px);
}

.quiz-button--secondary {
  background: transparent;
  border: 2px solid #4a5568;
  color: #ecf0f1;
}

.quiz-button--secondary:hover {
  border-color: #f1c40f;
  color: #f1c40f;
}

#start-quiz {
  display: block;
  margin: 0 auto;
}

.quiz-card {
  background: var(--background-card);
  border-radius: 12px;
  border: 1px solid #4a5568;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  padding: 2rem;
  margin-bottom: 2rem;
}

.quiz-progress {
  margin-bottom: 2rem;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: #4a5568;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #f1c40f, #e67e22);
  width: 0%;
  transition: width 0.3s ease;
}

.progress-text {
  text-align: center;
  color: #bdc3c7;
  font-size: 0.9rem;
}

.quiz-question {
  margin-bottom: 2rem;
}

.question-title {
  color: #f1c40f;
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.question-text {
  color: #ecf0f1;
  line-height: 1.6;
  font-size: 1.05rem;
}

.quiz-options {
  margin-bottom: 2rem;
}

.option-card {
  background: rgba(52, 73, 94, 0.5);
  border: 2px solid #4a5568;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 0.75rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.option-card:hover {
  border-color: #f1c40f;
  background: rgba(241, 196, 15, 0.1);
}

.option-card.selected {
  border-color: #f1c40f;
  background: rgba(241, 196, 15, 0.15);
}

.option-card.correct {
  border-color: #27ae60;
  background: rgba(39, 174, 96, 0.15);
}

.option-card.incorrect {
  border-color: #e74c3c;
  background: rgba(231, 76, 60, 0.15);
}

.option-letter {
  color: #f1c40f;
  font-weight: 600;
  font-size: 1.1rem;
  flex-shrink: 0;
  width: 1.5rem;
}

.option-text {
  color: #ecf0f1;
  line-height: 1.4;
  flex: 1;
}

.quiz-explanation {
  background: rgba(241, 196, 15, 0.1);
  border-left: 4px solid #f1c40f;
  border-radius: 0 8px 8px 0;
  padding: 1rem;
  margin: 1rem 0;
}

.explanation-title {
  color: #f1c40f;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.explanation-text {
  color: #ecf0f1;
  line-height: 1.5;
}

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

.results-card {
  background: var(--background-card);
  border-radius: 12px;
  border: 1px solid #4a5568;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  padding: 2rem;
  text-align: center;
}

.results-score {
  margin: 2rem 0;
}

.score-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, #f1c40f, #e67e22);
  margin: 0 auto;
}

.score-percentage {
  color: white;
  font-size: 2rem;
  font-weight: 600;
}

.results-feedback {
  margin: 2rem 0;
  padding: 1.5rem;
  border-radius: 8px;
  text-align: left;
}

.results-feedback.excellent {
  background: rgba(39, 174, 96, 0.1);
  border-left: 4px solid #27ae60;
}

.results-feedback.good {
  background: rgba(241, 196, 15, 0.1);
  border-left: 4px solid #f1c40f;
}

.results-feedback.needs-improvement {
  background: rgba(230, 126, 34, 0.1);
  border-left: 4px solid #e67e22;
}

.feedback-title {
  color: #f1c40f;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feedback-text {
  color: #ecf0f1;
  line-height: 1.5;
}

.results-breakdown {
  text-align: left;
  margin: 2rem 0;
}

.breakdown-item {
  display: flex;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid #4a5568;
}

.breakdown-question {
  flex: 1;
  color: #ecf0f1;
  font-size: 0.9rem;
}

.breakdown-result {
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

.breakdown-result.correct {
  color: #27ae60;
  background: rgba(39, 174, 96, 0.1);
}

.breakdown-result.incorrect {
  color: #e74c3c;
  background: rgba(231, 76, 60, 0.1);
}

.results-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.reading-recommendations {
  text-align: left;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid #4a5568;
}

.recommendations-title {
  color: #f1c40f;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.recommendations-text {
  color: #ecf0f1;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.recommended-books-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.recommended-book {
  background: rgba(52, 73, 94, 0.5);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
}

.recommended-book-title {
  color: #f1c40f;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.recommended-book-author {
  color: #bdc3c7;
  font-size: 0.8rem;
}

/*~~~ Mobile Styling ~~~*/
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 0.8rem;
    padding: 1rem 1.2rem;
  }

  .nav-links {
    gap: 0.8rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .main-content {
    padding: 1.5rem 0.8rem;
  }

  .section {
    padding: 1.2rem;
    margin-bottom: 1rem;
    margin-left: 0.5rem;
    margin-right: 0.5rem;
  }

  .image-container {
    max-width: 280px;
    margin: 1rem auto 1.5rem auto;
  }

  .image-container-small {
    max-width: 240px;
  }

  .image-container-large {
    max-width: 320px;
  }

  .heading-primary {
    font-size: 1.6rem;
    margin: 1.5rem 0 1rem 0;
  }

  .heading-secondary {
    font-size: 1.3rem;
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
  }

  .content-with-image {
    gap: 0.8rem;
  }

  .content-section {
    gap: 0.8rem;
    margin-bottom: 1.5rem;
  }

  .mobile-stack {
    flex-direction: column;
  }

  .mobile-full-width {
    width: 100%;
  }

  /* Books page mobile styles */
  .search-container {
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
  }

  .search-button {
    width: 100%;
    padding: 1rem;
  }

  .books-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .book-card {
    padding: 1.25rem;
  }

  .book-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .book-cover {
    width: 100px;
    height: 150px;
  }

  .book-links {
    justify-content: center;
  }

  /* Quiz mobile styles */
  .quiz-stats {
    gap: 1rem;
  }

  .quiz-card {
    padding: 1.5rem;
  }

  .quiz-actions {
    flex-direction: column;
  }

  .quiz-button {
    width: 100%;
    margin: 0.25rem 0;
  }

  .option-card {
    padding: 1rem 0.75rem;
  }

  .results-actions {
    flex-direction: column;
  }

  .score-circle {
    width: 100px;
    height: 100px;
  }

  .score-percentage {
    font-size: 1.5rem;
  }

  .recommended-books-list {
    grid-template-columns: 1fr;
  }
}