/* =============================================
   TitZiy Quiz — Glass Design + Dark/Light + Mobile-First
   ============================================= */


/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: var(--transition);
}
body.modal-open { overflow: hidden; }
a { color: var(--primary); text-decoration: none; }

/* ---------- Page Visibility (3 trạng thái: cài đặt → làm bài → kết quả) ---------- */
.page { display: none; animation: pageFadeIn 0.3s ease; }
.page.active { display: block; }
@keyframes pageFadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- Typography ---------- */
h2, h3 { font-weight: 600; letter-spacing: -0.01em; }
.text-gradient {
  background: var(--gradient-titziy);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Layout ---------- */
.container { max-width: 1000px; margin: 0 auto; padding: 16px; }


/* ============ PAGE 1: HOME / SUBJECT SELECTION ============ */

/* Hero / Title area */
.main-title {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-titziy);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  margin-bottom: 4px;
}
.project-info {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
  margin-bottom: 4px;
}

/* All cards use .glass pattern */
.info-section { margin-bottom: 16px; }
.user-input-section { margin-bottom: 16px; }
.input-section label {
  display: block;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.input-section input[type="text"] {
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
  font-family: var(--font);
  color: var(--text);
  outline: none;
  transition: var(--transition);
}
.input-section input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

/* Subject card header */
.subject-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.subject-card-header h2 { font-size: 1.15rem; }

.settings-toggle-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}
.settings-toggle-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: rotate(30deg);
}
.settings-toggle-btn.active { background: var(--primary); color: #fff; }

/* Lesson Type Tabs */
.lesson-type-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  padding: 6px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--glass-border);
}
.lesson-type-tab {
  flex: 1;
  padding: 10px 12px;
  border: none;
  border-radius: var(--radius-xs);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: var(--transition);
  white-space: nowrap;
  font-family: var(--font);
}
.lesson-type-tab:hover { background: var(--primary-soft); color: var(--text); }
.lesson-type-tab.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

/* Subject sections toggle */
.subject-section { display: none; }
.subject-section.active { display: block; }

.subject-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.subject-section-header h3 {
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 6px;
}
.subject-count {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Compact subject list */
.compact-subject-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 260px;
  overflow-y: auto;
}
.compact-subject-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  padding: 10px 14px;
  transition: var(--transition);
  cursor: default;
}
.compact-subject-item:hover { border-color: var(--glass-border-hover); }
.compact-subject-item.selected {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 2px rgba(99,102,241,0.2);
}

.subject-select-area {
  flex: 1;
  cursor: pointer;
  padding: 4px 0;
}
.subject-info {
  display: flex;
  align-items: center;
  gap: 8px;
}
.subject-name {
  font-weight: 500;
  font-size: 0.9rem;
}
.compact-subject-item .subject-count {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.subject-actions-area {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}
.subject-export-btn,
.subject-settings-btn,
.subject-delete-btn {
  width: 30px; height: 30px;
  border-radius: 50%;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  color: var(--text-muted);
}
.subject-export-btn:hover { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }
.subject-settings-btn:hover { background: var(--warning-soft); border-color: var(--warning); color: var(--warning); }
.subject-delete-btn:hover { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); }
.subject-delete-btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* Action section */
.action-section {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.action-section .btn { flex: 1; min-width: 140px; }
.start-glow {
  position: relative; overflow: hidden;
}
.start-glow::before {
  content: ''; position: absolute; inset: -2px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  animation: glowSweep 2.5s ease-in-out infinite;
}
@keyframes glowSweep {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Settings Panel */
.settings-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin-top: 16px;
  display: none;
  animation: slideDown 0.25s ease;
}
.settings-panel.show { display: block; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
.settings-header { margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--glass-border); }
.settings-header h4 { font-size: 1rem; display: flex; align-items: center; gap: 8px; }
.config-section { display: flex; flex-direction: column; gap: 12px; }
.config-option {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-xs);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}
.dark-mode .config-option { background: rgba(0,0,0,0.02); }
.config-option:hover { border-color: var(--primary); }
.config-option label { font-weight: 500; color: var(--text); font-size: 0.85rem; cursor: pointer; }

/* ============ SCORE STATS (Phase 3) ============ */
.score-ring-container { flex-shrink: 0; }
.score-stats { flex: 1; min-width: 180px; }
.stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  text-align: center;
}
.stat-icon { font-size: 1.4rem; }
.stat-icon.correct { color: var(--success); }
.stat-icon.incorrect { color: var(--danger); }
.stat-icon.primary { color: var(--primary); }
.stat-icon.muted { color: var(--text-muted); }
.stat-value { font-size: 1.3rem; font-weight: 700; color: var(--text); }
.stat-label { font-size: 0.75rem; color: var(--text-muted); font-weight: 500; }

/* ============ RESULT ITEMS (Phase 3) ============ */
.result-details { display: flex; flex-direction: column; gap: 8px; }
.result-item {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  padding: 12px 14px;
  transition: var(--transition);
  cursor: pointer;
}
.result-item:hover { border-color: var(--primary); }
.result-item.correct { border-left: 3px solid var(--success); }
.result-item.incorrect { border-left: 3px solid var(--danger); }
.result-item p { font-size: 0.88rem; margin-bottom: 4px; line-height: 1.4; }
.result-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.result-summary p { font-size: 0.82rem; color: var(--text-secondary); }
.view-detail-btn {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  border-radius: var(--radius-xs);
  padding: 6px 12px;
  font-size: 0.8rem;
  cursor: pointer;
  color: var(--text);
  font-family: var(--font);
  transition: var(--transition);
  white-space: nowrap;
}
.view-detail-btn:hover { border-color: var(--primary); color: var(--primary); }

/* ============ DETAIL MODAL OVERRIDES ============ */
.detail-option { cursor: default; }
.detail-option.user-selected { border-color: var(--primary) !important; background: var(--primary-soft) !important; }
.detail-option.correct-answer { border-color: var(--success) !important; background: var(--success-soft) !important; }

.quiz-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}
.quiz-header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.quiz-header h1 {
  font-size: 1.2rem;
  font-weight: 700;
}
.question-counter {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 4px 10px;
  background: var(--glass-bg);
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  white-space: nowrap;
}
.quiz-progress { margin-top: 2px; }

.question-section { margin-bottom: 12px; }
.question-content h2 {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.5;
}

.options-section {
  margin-bottom: 12px;
  transition: var(--transition);
  border-radius: var(--radius-sm);
  padding: 4px;
}

/* Option items (clickable) */
.options-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius-xs);
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text);
  transition: var(--transition);
}
.option:hover { border-color: var(--primary); background: var(--primary-soft); }
.option.selected {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 2px rgba(99,102,241,0.25);
}
.options-section.correct .option.selected {
  border-color: var(--success);
  background: var(--success-soft);
  box-shadow: 0 0 0 2px rgba(16,185,129,0.25);
}
.options-section.incorrect .option.selected {
  border-color: var(--danger);
  background: var(--danger-soft);
  box-shadow: 0 0 0 2px rgba(239,68,68,0.25);
}
.option-letter {
  display: inline-flex;
  width: 28px; height: 28px;
  align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--glass-bg);
  font-weight: 600; font-size: 0.8rem;
  flex-shrink: 0;
  color: var(--text-secondary);
}
.option.selected .option-letter { background: var(--primary); color: #fff; }
.option-text { flex: 1; }

/* Status */
.status-container { margin-bottom: 12px; }
.status {
  text-align: center;
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}
.status.correct { background: var(--success-soft); border-color: var(--success); color: var(--success); }
.status.incorrect { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); }

/* Navigation */
.navigation-section { margin-bottom: 12px; }
.navigation {
  display: flex;
  gap: 8px;
}
.navigation .btn { flex: 1; }

/* Mobile navigation */
.mobile-navigation {
  position: fixed;
  bottom: 0;
  left: 0; right: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
  padding: 10px 16px;
  z-index: 100;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
  display: none;
}
.mobile-nav-buttons {
  display: flex;
  gap: 8px;
}
.mobile-nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  background: var(--surface);
  color: var(--text);
  font-size: 0.7rem;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
}
.mobile-nav-btn:hover { border-color: var(--primary); }
.mobile-nav-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.mobile-nav-btn.check { background: var(--primary); color: #fff; border-color: var(--primary); }
.mobile-nav-btn.check:disabled { opacity: 0.4; }
.mobile-nav-icon { font-size: 1.2rem; }

/* Short Answer */
.short-answer-section { padding: 4px 0; }
.short-answer-section .input-group {
  margin-bottom: 8px;
}
.short-answer-section label {
  display: block;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.short-answer-section input[type="text"] {
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
  font-family: var(--font);
  color: var(--text);
  outline: none;
  transition: var(--transition);
}
.short-answer-section input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.answer-hint { color: var(--text-muted); font-size: 0.82rem; }

/* True/False Set */
.true-false-set { padding: 4px 0; }
.sub-questions { display: flex; flex-direction: column; gap: 8px; }
.sub-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
}
.sub-question-content { flex: 1; }
.sub-question-text { font-size: 0.9rem; line-height: 1.4; }
.sub-question-number { font-weight: 600; color: var(--primary); margin-right: 4px; }
.true-false-buttons { display: flex; gap: 6px; flex-shrink: 0; }
.tf-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--glass-border);
  background: transparent;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.tf-btn.correct:hover { border-color: var(--success); background: var(--success-soft); }
.tf-btn.correct.selected { border-color: var(--success); background: var(--success-soft); }
.tf-btn.incorrect:hover { border-color: var(--danger); background: var(--danger-soft); }
.tf-btn.incorrect.selected { border-color: var(--danger); background: var(--danger-soft); }
.tf-hint { color: var(--text-muted); font-size: 0.78rem; margin-top: 8px; }

/* ============ PAGE 3: RESULTS ============ */

.header-section {
  text-align: center;
  margin-bottom: 16px;
}
.header-section h1 { font-size: 1.5rem; }
.subtitle { color: var(--text-muted); font-size: 0.9rem; }

.score-section { margin-bottom: 16px; }
.score-display {
  display: flex;
  gap: 16px;
  justify-content: center;
}
.score-item {
  text-align: center;
  padding: 16px 24px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  min-width: 120px;
}
.score-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.score-value {
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--gradient-titziy);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Result items */
.result-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}
.result-item {
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: var(--transition);
}
.result-item:hover { border-color: var(--glass-border-hover); }
.result-item.correct { border-left: 3px solid var(--success); }
.result-item.incorrect { border-left: 3px solid var(--danger); }
.result-item p { font-size: 0.9rem; margin-bottom: 6px; }
.result-item p:last-child { margin-bottom: 0; }
.result-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}
.result-actions { flex-shrink: 0; }
.view-detail-btn {
  padding: 6px 12px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--primary);
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--font);
  transition: var(--transition);
}
.view-detail-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ============ MODAL BASE ============ */

.modal {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1000;
  align-items: center; justify-content: center;
  padding: 16px;
}
.modal.active { display: flex; }
.modal-content {
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 560px; width: 100%;
  max-height: 85vh; overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.25s ease;
}
@keyframes modalIn { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }
.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--glass-border);
}
.modal-header h3 { font-size: 1.1rem; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.close-btn-new {
  width: 30px; height: 30px; border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: transparent;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1rem; color: var(--text-muted);
  transition: var(--transition);
}
.close-btn-new:hover { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); }
.modal-body { margin-bottom: 12px; }

/* Modal forms */
.modal label {
  display: block; margin-bottom: 4px;
  font-weight: 500; font-size: 0.85rem; color: var(--text-secondary);
}
.modal input[type="text"],
.modal textarea,
.modal select {
  width: 100%; padding: 10px 12px;
  background: var(--surface);
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius-xs);
  font-size: 0.9rem; color: var(--text);
  font-family: var(--font);
  outline: none; transition: var(--transition);
  margin-bottom: 12px;
}
.modal input:focus, .modal textarea:focus, .modal select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.modal textarea { resize: vertical; min-height: 80px; }
.modal .input-section { margin-bottom: 12px; }

/* ---------- Question Detail Modal ---------- */
.detail-options { display: flex; flex-direction: column; gap: 8px; }
.detail-option {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
}
.detail-option .option-letter {
  width: 26px; height: 26px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--glass-bg);
  font-weight: 600; font-size: 0.8rem;
  flex-shrink: 0;
}
.detail-option.user-selected { border-color: var(--primary); background: var(--primary-soft); }
.detail-option.correct-answer { border-color: var(--success); background: var(--success-soft); }
.detail-option.user-selected .option-letter { background: var(--primary); color: #fff; }
.detail-option.correct-answer .option-letter { background: var(--success); color: #fff; }

.detail-short-answer { padding: 4px 0; }
.detail-answer-input {
  padding: 10px 12px;
  border-radius: var(--radius-xs);
  margin-bottom: 8px;
  font-size: 0.9rem;
}
.detail-answer-input.correct { background: var(--success-soft); border: 1px solid var(--success); }
.detail-answer-input.incorrect { background: var(--danger-soft); border: 1px solid var(--danger); }

.detail-true-false { padding: 4px 0; }
.detail-sub-questions { display: flex; flex-direction: column; gap: 8px; }
.detail-sub-question {
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
}
.detail-sub-question.correct { border-left: 3px solid var(--success); }
.detail-sub-question.incorrect { border-left: 3px solid var(--danger); }
.detail-sub-question-text { font-size: 0.9rem; margin-bottom: 4px; }
.detail-sub-question-answer {
  display: flex; gap: 12px; flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.sub-question-result { font-weight: 600; }
.sub-question-result.correct { color: var(--success); }
.sub-question-result.incorrect { color: var(--danger); }

.detail-result {
  margin-top: 12px;
  padding: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
}
.result-info { display: flex; flex-direction: column; gap: 4px; font-size: 0.85rem; }
.choice-value { color: var(--primary); font-weight: 600; }
.answer-value { color: var(--success); font-weight: 600; }

/* ---------- Subject Settings Modal ---------- */
.settings-controls {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.settings-controls .btn { flex: 1; }

.question-type-section {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--glass-border);
}
.question-type-section:last-child { border-bottom: none; }
.type-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.type-header h4 { font-size: 0.9rem; display: flex; align-items: center; gap: 6px; }
.btn-small {
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.75rem;
  font-family: var(--font);
  transition: var(--transition);
}
.btn-small:hover { border-color: var(--primary); color: var(--primary); }
.question-list { display: flex; flex-direction: column; gap: 4px; }
.question-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  font-size: 0.82rem;
  transition: var(--transition);
}
.question-item.selected { border-color: var(--primary); background: var(--primary-soft); }
.question-item input[type="checkbox"] {
  accent-color: var(--primary);
  width: 16px; height: 16px;
}
.question-item .question-content { flex: 1; font-size: 0.82rem; color: var(--text-secondary); }
.settings-actions {
  display: flex; gap: 8px; justify-content: flex-end;
  margin-top: 12px; padding-top: 12px;
  border-top: 1px solid var(--glass-border);
}
.settings-actions .btn { min-width: 100px; }

/* ---------- Import Data Modal ---------- */
.file-input-section { margin-bottom: 12px; }
.file-drop-area {
  border: 2px dashed var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--surface);
}
.file-drop-area:hover, .file-drop-area.highlight {
  border-color: var(--primary);
  background: var(--primary-soft);
}
.file-drop-content { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.file-drop-icon { font-size: 2rem; opacity: 0.5; }
.file-drop-area p { color: var(--text-muted); font-size: 0.85rem; }
.file-browse-link { color: var(--primary); font-weight: 600; text-decoration: underline; }

/* ---------- GitHub Repos Modal ---------- */
.saved-repos-list { display: flex; flex-direction: column; gap: 8px; }
.saved-repo-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
}
.repo-info { flex: 1; min-width: 0; }
.repo-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 2px;
}
.repo-name { font-weight: 600; font-size: 0.9rem; }
.repo-status { font-size: 0.82rem; }
.repo-status.synced { color: var(--success); }
.repo-status.not-synced { color: var(--warning); }
.repo-url {
  font-size: 0.78rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.repo-description { font-size: 0.82rem; color: var(--text-secondary); margin-top: 2px; }
.repo-meta { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }
.repo-actions { flex-shrink: 0; }
.repo-action-btn {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: transparent;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.repo-action-btn:hover { background: var(--danger-soft); border-color: var(--danger); }
.modal .card {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 12px;
}
.modal .card h4 { font-size: 0.95rem; margin-bottom: 10px; display: flex; align-items: center; gap: 6px; }

/* ============ RESPONSIVE ============ */

/* Tablet & up */
@media (min-width: 768px) {
  .container { padding: 24px; }
  .mobile-navigation { display: none !important; }
}

/* Mobile */
@media (max-width: 767px) {
  .container { padding: 12px; }
  body { padding-bottom: 80px; }
  .mobile-navigation { display: block; }
  .desktop-navigation { display: none !important; }

  .main-title { font-size: 1.6rem; }
  .lesson-type-tab { font-size: 0.75rem; padding: 8px 6px; }
  .lesson-type-tab span { display: none; }
  .lesson-type-tab i { font-size: 1rem; }
  .lesson-type-tab.active span { display: inline; }

  .compact-subject-item { padding: 8px 12px; }
  .subject-actions-area { gap: 2px; }

  .score-display { flex-direction: column; gap: 8px; }
  .score-item { padding: 12px; min-width: auto; }
  .score-value { font-size: 1.5rem; }

  .result-summary { flex-direction: column; align-items: flex-start; }
  .result-actions { width: 100%; }
  .view-detail-btn { width: 100%; text-align: center; }

  .modal-content { padding: 16px; max-height: 90vh; }
  .settings-controls { flex-direction: column; }
  .settings-controls .btn { width: 100%; }

  .sub-question { flex-direction: column; align-items: flex-start; gap: 8px; }
  .true-false-buttons { align-self: flex-end; }

  .detail-sub-question-answer { flex-direction: column; gap: 2px; }

  .navigation .btn { font-size: 0.82rem; padding: 8px 12px; }
}

/* Small phones */
@media (max-width: 400px) {
  .action-section { flex-direction: column; }
  .action-section .btn { width: 100%; }
  .subject-card-header h2 { font-size: 1rem; }
  .quiz-header { flex-direction: column; gap: 8px; }
  .option { padding: 10px 12px; font-size: 0.85rem; }

  /* Stats cards — compact on small phones */
  .stat-item { padding: 10px 6px; }
  .stat-icon { font-size: 1.2rem; }
  .stat-value { font-size: 1.1rem; }
  .stat-label { font-size: 0.62rem; }
  .stats-header h2 { font-size: 0.9rem; }
  .stats-toggle { font-size: 0.7rem; }
}
/* Tiny phones */
@media (max-width: 360px) {
  .stat-item { padding: 6px 3px; border-radius: 10px; }
  .stat-icon { font-size: 0.95rem; margin-bottom: 2px; }
  .stat-value { font-size: 0.95rem; }
  .stat-label { font-size: 0.55rem; }
  .bento-grid { gap: 5px; }
}

/* ===== STATS SECTION ===== */
.stats-section .stats-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.stats-header h2 {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0;
}
.stats-toggle {
    font-size: 0.8rem;
    color: var(--primary, #7C3AED);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    transition: opacity 0.2s;
}
.stats-toggle:hover { opacity: 0.8; }

/* Bento Grid — 4 stat boxes */
.bento-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}
.stat-item {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 14px;
    padding: 14px 12px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}
.stat-item:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 20px rgba(124,58,237,0.15);
}
.stat-icon { font-size: 1.6rem; margin-bottom: 4px; }
.stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #818cf8, #ec4899, #f97316);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    font-size: 0.72rem;
    color: var(--text-secondary, #94a3b8);
    margin-top: 2px;
}
.stats-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px;
    color: var(--text-muted, #64748b);
}
.stats-empty-icon { font-size: 2rem; }
.stats-empty-text { font-size: 0.85rem; text-align: center; }

/* Attempt History */
.attempt-history {
    margin-top: 12px;
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 10px;
}
.attempt-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 8px;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s;
}
.attempt-item:hover { background: rgba(255,255,255,0.05); }
.attempt-left { flex: 1; min-width: 0; }
.attempt-subject {
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.attempt-meta {
    font-size: 0.72rem;
    color: var(--text-secondary, #94a3b8);
    margin-top: 2px;
}
.attempt-score {
    text-align: center;
    font-weight: 700;
    font-size: 0.85rem;
    white-space: nowrap;
}
.attempt-score.good { color: #10B981; }
.attempt-score.ok { color: #F59E0B; }
.attempt-score.bad { color: #EF4444; }
.attempt-star { font-size: 0.75rem; margin-left: 4px; }
.attempt-retry-btn {
    background: none;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 8px;
    padding: 6px 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}
.attempt-retry-btn:hover { background: rgba(255,255,255,0.1); }

/* Responsive — 4 columns on wider screens */
@media (min-width: 768px) {
    .bento-grid { grid-template-columns: repeat(4, 1fr); }
}