/* Natural Phrases section */
.phrase-group {
  display: grid;
  gap: 20px;
}

.phrase-category {
  display: grid;
  gap: 8px;
}

.phrase-category-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--primary-dark);
}

.phrase-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.phrase-chip {
  background: rgba(249, 115, 22, 0.08);
  border: 1px solid rgba(249, 115, 22, 0.2);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.92rem;
  color: var(--text);
}

/* Dialogue styles for Basic Conversations */
.dialogue {
  display: grid;
  gap: 14px;
}

.dialogue-line {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.dialogue-speaker {
  font-weight: 700;
  color: var(--primary);
  min-width: 28px;
  flex-shrink: 0;
  padding-top: 2px;
}

.dialogue-text {
  flex: 1;
  line-height: 1.6;
}

.dialogue-blank {
  flex: 1;
  border: none;
  border-bottom: 2px solid rgba(249, 115, 22, 0.4);
  background: transparent;
  padding: 4px 6px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  width: 100%;
  outline: none;
  transition: border-color 0.2s;
}

.dialogue-blank:focus {
  border-bottom-color: var(--primary);
}

/* Hidden: header-actions and non-active nav links on all materials/topic pages */
.site-header .header-actions {
  display: none;
}

.site-header .nav a:not(.active) {
  display: none;
}

.materials-main,
.topics-main,
.topic-detail-main,
.temp-main {
  width: min(1100px, 92vw);
  margin: 0 auto;
  padding: 16px 0 96px;
}

.topic-detail-main {
  display: grid;
  gap: 24px;
}

.materials-hero,
.topics-hero,
.topic-hero,
.temp-hero {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
}

.materials-hero h1,
.topics-hero h1,
.topic-hero h1,
.temp-hero h1 {
  font-size: clamp(2.2rem, 3vw, 3rem);
}

.materials-subtext,
.topics-subtext,
.topic-subtext,
.temp-subtext {
  max-width: 640px;
}

.corporate-quiz-cta {
  margin-top: 24px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  padding: 14px 28px;
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.25);
  transition: all 0.2s ease;
}

.corporate-quiz-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(249, 115, 22, 0.35);
}

.nav a.active {
  color: var(--primary);
}

.text-link {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.text-link:hover {
  color: var(--primary-dark);
}

.materials-grid,
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.folder-card,
.topic-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid rgba(244, 158, 103, 0.2);
  text-decoration: none;
  min-height: 210px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.folder-card:hover,
.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.folder-card.is-disabled,
.topic-card.is-disabled {
  opacity: 0.6;
  pointer-events: none;
}

.folder-icon {
  width: 54px;
  height: 40px;
  background: var(--primary-light);
  border-radius: 12px;
  position: relative;
  box-shadow: inset 0 0 0 2px rgba(249, 115, 22, 0.2);
}

.folder-icon::before {
  content: '';
  position: absolute;
  left: 8px;
  top: -8px;
  width: 26px;
  height: 12px;
  background: var(--primary-light);
  border-radius: 8px 8px 0 0;
  box-shadow: inset 0 0 0 2px rgba(249, 115, 22, 0.2);
}

.folder-icon--quiz {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary-light) 0%, rgba(249, 115, 22, 0.2) 100%);
}

.folder-icon--quiz::before {
  display: none;
}

.folder-body h3,
.topic-card h3 {
  font-size: 1.2rem;
  margin: 0;
}

.folder-body p,
.topic-card p {
  color: var(--text-muted);
  margin: 0;
}

.folder-meta,
.topic-meta {
  margin-top: auto;
  display: flex;
  justify-content: flex-start;
}

.status-badge {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(249, 115, 22, 0.1);
  color: var(--primary);
}

.status-ready {
  background: rgba(22, 163, 74, 0.12);
  color: #15803d;
}

.level-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

.level-beginner {
  background: rgba(59, 130, 246, 0.1);
  color: #1d4ed8;
}

.level-intermediate {
  background: rgba(139, 92, 246, 0.1);
  color: #6d28d9;
}

.level-advanced {
  background: rgba(239, 68, 68, 0.1);
  color: #b91c1c;
}

.folder-meta,
.topic-meta {
  gap: 8px;
  flex-wrap: wrap;
}

.topic-hero {
  text-align: left;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 32px;
}

.topic-hero .text-link {
  align-self: flex-start;
}

/* Category sections on basic-conversations.html */
.topic-category-section {
  margin-bottom: 48px;
}

.topic-category-header {
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(249, 115, 22, 0.18);
}

.topic-category-title {
  font-size: 1.35rem;
  margin: 0 0 4px;
  color: var(--text);
}

.topic-category-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0;
}

.topic-sections {
  display: grid;
  gap: 24px;
}

.topic-section {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(244, 158, 103, 0.2);
}

.topic-section h2 {
  font-size: 1.35rem;
  margin-bottom: 16px;
}

.starter-list,
.question-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.starter-list li,
.question-list li {
  background: rgba(249, 115, 22, 0.08);
  border-radius: var(--radius-md);
  padding: 16px;
}

.starter-list strong,
.question-list strong {
  color: var(--text);
}

.question-list li {
  position: relative;
}

.question-suggest {
  display: block;
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.topic-items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.topic-item {
  background: rgba(249, 115, 22, 0.08);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topic-item h3 {
  font-size: 1.05rem;
  margin: 0;
}

.topic-item p {
  margin: 0;
  color: var(--text-muted);
}

.topic-item span {
  font-weight: 600;
  color: var(--text);
}

.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.flashcard {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(244, 158, 103, 0.2);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.flashcard::before {
  content: '';
  position: absolute;
  top: -48px;
  right: -48px;
  width: 140px;
  height: 140px;
  background: radial-gradient(circle at center, rgba(249, 115, 22, 0.2), rgba(249, 115, 22, 0));
}

.flashcard-header,
.flashcard-section {
  position: relative;
  z-index: 1;
}

.flashcard-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.flashcard-header h3 {
  font-size: 1.2rem;
  margin: 0;
}

.flashcard-index {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(249, 115, 22, 0.16);
  color: var(--primary-dark);
}

.flashcard-section {
  background: rgba(249, 115, 22, 0.08);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.flashcard-section p {
  margin: 0;
}

.flashcard-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-dark);
}

.flashcard-questions {
  margin: 0;
  padding-left: 18px;
  color: var(--text-muted);
  display: grid;
  gap: 6px;
}

.flashcard-questions li {
  margin: 0;
}

.temp-panel {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.temp-panel h2 {
  margin-bottom: 12px;
}

/* Grammar formula block */
.grammar-formula {
  background: #fafafa;
  border: 1px solid rgba(244, 158, 103, 0.3);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 16px;
}
.grammar-formula-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 12px 18px;
  border-bottom: 1px solid rgba(244, 158, 103, 0.15);
}
.grammar-formula-row:last-child { border-bottom: none; }
.grammar-formula-sign {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-dark);
  min-width: 20px;
  flex-shrink: 0;
  font-family: 'Courier New', Courier, monospace;
}
.grammar-formula-text {
  font-size: 0.95rem;
  color: var(--text);
  font-family: 'Courier New', Courier, monospace;
  line-height: 1.5;
}
.grammar-formula-text em {
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.88rem;
}

@media (max-width: 900px) {
  .materials-hero,
  .topics-hero,
  .topic-hero,
  .temp-hero {
    text-align: left;
    align-items: flex-start;
  }

  .materials-main,
  .topics-main,
  .topic-detail-main,
  .temp-main {
    padding-top: 8px;
  }
}

@media (max-width: 640px) {
  .materials-grid,
  .topics-grid,
  .topic-items,
  .flashcard-grid {
    grid-template-columns: 1fr;
  }

  .folder-card,
  .topic-card {
    min-height: auto;
  }
}