/* === Learn Page Styles === */

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

/* Chapter list */
.chapter-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.chapter-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: 12px;
  padding: 1.2rem 1.5rem;
  cursor: pointer;
  transition: all 0.2s;
}

.chapter-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.chapter-number {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: #5a5a6e;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.chapter-info {
  flex: 1;
}

.chapter-info h3 {
  font-size: 1.05rem;
  color: var(--color-text);
  margin-bottom: 0.2rem;
}

.chapter-progress {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* Back button */
.back-btn {
  background: none;
  border: none;
  color: var(--color-text-light);
  font-size: 0.9rem;
  font-family: var(--font-main);
  cursor: pointer;
  padding: 0.5rem 0;
  margin-bottom: 1rem;
  transition: color 0.2s;
}

.back-btn:hover {
  color: var(--color-primary-dark);
}

/* Tabs */
.learn-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
  margin: 1.5rem 0;
}

.tab-btn {
  padding: 0.75rem 1.5rem;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-main);
  color: var(--color-text-light);
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: -2px;
}

.tab-btn:hover {
  color: var(--color-text);
}

.tab-btn.active {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary-dark);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Learning text */
.learning-text {
  background: var(--color-bg-warm);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  line-height: 1.8;
  color: var(--color-text);
  font-size: 0.95rem;
  white-space: pre-line;
}

/* Worked examples */
.examples-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.example-card {
  background: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
}

.example-problem {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.example-analysis {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
  padding: 1rem;
  background: #f8f8f4;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  white-space: pre-line;
}

.example-answer {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.show-answer-btn {
  padding: 0.5rem 1rem;
  background: var(--color-bg-warm);
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-main);
  color: var(--color-text-light);
  cursor: pointer;
  transition: all 0.2s;
}

.show-answer-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  background: #f0faf4;
}

.example-solution {
  margin-top: 0.75rem;
}

/* Practice area */
.practice-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.practice-stats {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.start-practice-btn {
  padding: 0.7rem 1.5rem;
  background: var(--color-primary);
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-main);
  color: #5a5a6e;
  cursor: pointer;
  transition: background 0.2s;
}

.start-practice-btn:hover {
  background: var(--color-primary-dark);
}

/* Question display */
.question-area {
  margin-top: 1rem;
}

.question-card {
  background: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: 14px;
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.question-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.question-number-badge {
  background: var(--color-primary);
  color: #5a5a6e;
  padding: 0.3rem 0.8rem;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 700;
}

.question-difficulty {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

.question-text {
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: 1.5rem;
  line-height: 1.6;
  white-space: pre-line;
}

.question-image {
  margin-bottom: 1.5rem;
  text-align: center;
}

.question-image img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.show-image-btn {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.3rem 0.8rem;
  font-size: 0.8rem;
  color: var(--color-text-light);
  cursor: pointer;
  margin-bottom: 1rem;
}

.show-image-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

/* Grid pattern boxes */
.grid-pattern-display {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

.grid-box {
  border: 2px solid var(--color-text-light);
  border-radius: 4px;
  min-width: 80px;
}

.grid-top {
  display: flex;
  border-bottom: 1px solid var(--color-text-light);
}

.grid-top .grid-cell {
  flex: 1;
  padding: 0.5rem 0.8rem;
  text-align: center;
  font-weight: 700;
  font-size: 1rem;
}

.grid-top .grid-cell:first-child {
  border-right: 1px solid var(--color-text-light);
}

.grid-bottom {
  padding: 0.5rem 0.8rem;
  text-align: center;
  font-weight: 700;
  font-size: 1rem;
}

/* Diamond pattern */
.diamond-pattern-display {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin: 1rem 0;
  align-items: center;
}

.diamond-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.diamond-top, .diamond-bottom {
  display: flex;
  justify-content: center;
}

.diamond-mid {
  display: flex;
  gap: 2rem;
}

.diamond-node {
  width: 32px;
  height: 32px;
  border: 2px solid var(--color-text-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--color-bg-alt);
}

/* Sequence display */
.sequence-display {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0.75rem 0;
  align-items: center;
}

.seq-num {
  font-weight: 600;
  font-size: 1.05rem;
}

.seq-num::after {
  content: ',';
  color: var(--color-text-light);
}

.seq-num:last-child::after {
  content: '';
}

.seq-blank {
  font-weight: 700;
  color: var(--color-primary-dark);
  border-bottom: 2px solid var(--color-primary);
  padding: 0 0.3rem;
}

/* Answer input for fill type */
.answer-input-group {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.answer-input {
  padding: 0.6rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: 1.1rem;
  font-family: var(--font-main);
  width: 120px;
  outline: none;
  transition: border-color 0.2s;
}

.answer-input:focus {
  border-color: var(--color-primary);
}

.submit-answer-btn {
  padding: 0.6rem 1.2rem;
  background: var(--color-primary);
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-main);
  color: #5a5a6e;
  cursor: pointer;
}

.submit-answer-btn:hover {
  background: var(--color-primary-dark);
}

/* Feedback */
.question-feedback {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.6;
}

.question-feedback.correct {
  background: #e8f5e9;
  color: #2e7d32;
}

.question-feedback.incorrect {
  background: #fbe9e7;
  color: #c62828;
}

.question-feedback .explanation {
  margin-top: 0.5rem;
  font-style: italic;
  opacity: 0.85;
}

/* Navigation between questions */
.question-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 1rem;
}

/* Sub-questions within a grouped question */
.sub-question {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0.5rem;
}

.sub-question:last-of-type {
  border-bottom: none;
}

.sub-question-text {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.sub-feedback {
  margin-top: 0.75rem;
  padding: 0.75rem;
  font-size: 0.85rem;
}

.nav-question-btn {
  padding: 0.5rem 1rem;
  background: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-family: var(--font-main);
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color 0.2s;
}

.nav-question-btn:hover {
  border-color: var(--color-primary);
}

/* Nav active */
.nav-links a.active {
  color: #fff;
  border-bottom: 2px solid #fff;
  padding-bottom: 2px;
}

@media (max-width: 600px) {
  .learn-main {
    padding: 1rem;
  }

  .question-card {
    padding: 1.2rem;
  }
}