/* vocab-style.css v1 — Student Vocab Tab + Passage Highlighter
   All .vc- prefixed. Uses CSS variables from student.css. */

/* ===== Sub-Nav (List / Flashcard / Stats) ===== */
.vc-subnav {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.vc-subnav-btn {
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}
.vc-subnav-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===== Controls Bar ===== */
.vc-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 16px;
}
.vc-deck-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}
.vc-deck-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.vc-search {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  font-size: 13px;
  min-width: 160px;
  outline: none;
}
.vc-search:focus {
  border-color: var(--primary);
}
.vc-tier-select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  font-size: 13px;
  outline: none;
}

/* ===== Word List Cards ===== */
.vc-word-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.vc-word-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--text-tertiary);
  border-radius: var(--radius);
  padding: 10px 14px;
  cursor: pointer;
  transition: box-shadow 0.15s;
}
.vc-word-card:hover {
  box-shadow: var(--shadow);
}
.vc-word-card.tier-t1 {
  border-left-color: var(--wrong);
}
.vc-word-card.tier-t2 {
  border-left-color: var(--warning);
}
.vc-word-card.tier-t3,
.vc-word-card.tier-t4,
.vc-word-card.tier-t5 {
  border-left-color: var(--correct);
}

.vc-word-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.vc-word-text {
  font-weight: 600;
  font-size: 15px;
}
.vc-word-def-short {
  color: var(--text-secondary);
  font-size: 13px;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.vc-word-due {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 10px;
  background: var(--warning-bg);
  color: var(--warning);
}
.vc-word-due.new {
  background: var(--primary-light);
  color: var(--primary);
}
.vc-word-due.mature {
  background: var(--correct-bg);
  color: var(--correct);
}

/* ===== Expanded Card Detail ===== */
.vc-detail {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.7;
}
.vc-detail-section {
  margin-bottom: 8px;
}
.vc-detail-label {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}
.vc-detail-value {
  color: var(--text);
}
.vc-cognate-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  margin: 2px 4px 2px 0;
}
.vc-context-sentence {
  padding: 6px 10px;
  margin: 4px 0;
  background: var(--bg);
  border-radius: 4px;
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== Tier Badges ===== */
.vc-tier-badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
}
.vc-tier-sat {
  background: #fef3c7;
  color: #92400e;
}
.vc-tier-gre {
  background: #fee2e2;
  color: #991b1b;
}
.vc-tier-academic {
  background: #dbeafe;
  color: #1e40af;
}
.vc-tier-unknown {
  background: var(--bg);
  color: var(--text-secondary);
}
[data-theme="dark"] .vc-tier-sat {
  background: #4a3500;
  color: #fbbf24;
}
[data-theme="dark"] .vc-tier-gre {
  background: #5c1a1a;
  color: #fca5a5;
}
[data-theme="dark"] .vc-tier-academic {
  background: #1e3a5f;
  color: #93c5fd;
}

/* ===== Flashcard ===== */
.vc-flashcard-wrap {
  max-width: 620px;
  margin: 0 auto;
  padding: 20px 0;
}
.vc-flash-progress {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-secondary);
}
.vc-flash-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.vc-flash-progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.3s;
}
.vc-flash-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.vc-flash-word {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}
.vc-flash-hint {
  font-size: 13px;
  color: var(--text-secondary);
}

/* 2x2 choice grid */
.vc-flash-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 20px;
}
.vc-flash-choice {
  padding: 12px 16px;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: center;
  font-size: 14px;
  transition: all 0.15s;
}
.vc-flash-choice:hover {
  border-color: var(--primary);
}
.vc-flash-choice.correct {
  border-color: var(--correct);
  background: var(--correct-bg);
}
.vc-flash-choice.wrong {
  border-color: var(--wrong);
  background: var(--wrong-bg);
}

/* Post-answer: root + cognates reveal */
.vc-flash-reveal {
  margin-top: 16px;
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius);
  text-align: left;
  font-size: 13px;
  line-height: 1.6;
}
.vc-flash-reveal-word {
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 6px;
}

/* Quality buttons row */
.vc-quality-row {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 20px;
}
.vc-quality-btn {
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}
.vc-quality-btn:hover {
  box-shadow: var(--shadow);
}
.vc-quality-btn.again {
  border-color: var(--wrong);
  color: var(--wrong);
}
.vc-quality-btn.hard {
  border-color: var(--warning);
  color: var(--warning);
}
.vc-quality-btn.good {
  border-color: var(--correct);
  color: var(--correct);
}
.vc-quality-btn.easy {
  border-color: var(--primary);
  color: var(--primary);
}

/* ===== Review Stats ===== */
.vc-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}
.vc-stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.vc-stat-num {
  font-size: 24px;
  font-weight: 700;
}
.vc-stat-num.due {
  color: var(--warning);
}
.vc-stat-num.learning {
  color: var(--primary);
}
.vc-stat-num.mature {
  color: var(--correct);
}
.vc-stat-num.new {
  color: var(--text-secondary);
}
.vc-stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}
.vc-reset-btn {
  padding: 6px 14px;
  border: 1px solid var(--wrong);
  border-radius: 6px;
  background: transparent;
  color: var(--wrong);
  cursor: pointer;
  font-size: 12px;
  margin-top: 8px;
}

/* ===== Pagination ===== */
.vc-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
  padding: 12px 0;
}
.vc-page-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
}
.vc-page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.vc-page-info {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== Empty state ===== */
.vc-empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
}
.vc-empty-icon {
  font-size: 40px;
  margin-bottom: 12px;
}

/* ===== Passage Highlighter Shared ===== */
.vc-passage {
  font-size: 14px;
  line-height: 1.75;
  white-space: pre-wrap;
}
.vc-hw {
  cursor: pointer;
  border-bottom: 2px dotted;
  transition: background 0.15s;
  border-radius: 2px;
}
.vc-hw:hover {
  background: rgba(74, 108, 247, 0.15);
}
.vc-hw-gre {
  border-bottom-color: var(--wrong);
  color: var(--wrong);
}
.vc-hw-sattested {
  border-bottom-color: var(--warning);
  color: var(--warning);
}
.vc-hw-academic {
  border-bottom-color: var(--primary);
}
.vc-hw-unknown {
  border-bottom-color: var(--text-tertiary);
}

/* Popup */
.vc-popup {
  position: absolute;
  z-index: 9999;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  padding: 12px 16px;
  max-width: 320px;
  min-width: 180px;
}
.vc-popup-word {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}
.vc-popup-def {
  font-size: 13px;
  color: var(--text);
  margin-top: 6px;
  line-height: 1.5;
}
.vc-popup-freq {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 6px;
}

/* Highlighter Controls */
.vc-hl-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}
.vc-hl-toggle {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 12px;
  transition: all 0.2s;
}
.vc-hl-toggle.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.vc-hl-tier-select {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  font-size: 12px;
}

/* ===== Vocab Tab Layout ===== */
.vocab-layout {
  flex-direction: column;
  padding: 20px;
  overflow-y: auto;
}