:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --text: #0f172a;
  --text-muted: #475569;
  --border: #e2e8f0;
  --radius-lg: 18px;
  --radius-md: 12px;
  --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
}

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

html,
body {
  max-width: 100%;
  overflow-x: clip;
}

body {
  font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* Header */
.app-header {
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
  color: #ffffff;
  padding: 14px 20px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

/* Focus Mode: Hide main app header while taking an exam so only 1 compact sticky bar remains */
body.exam-mode .app-header {
  display: none !important;
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.brand-logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: #ffffff;
  color: #1e40af;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 900;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
}

.brand-title {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-size: 13px;
  opacity: 0.9;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

@media (max-width: 640px) {
  .app-header {
    padding: 10px 12px;
  }
  .header-inner {
    gap: 8px;
  }
  .brand {
    gap: 8px;
  }
  .brand-logo {
    width: 34px;
    height: 34px;
    font-size: 18px;
    border-radius: 9px;
  }
  .brand-title {
    font-size: 15px;
    line-height: 1.2;
  }
  .brand-sub {
    font-size: 11px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .header-actions {
    width: 100%;
    gap: 6px;
  }
  .header-actions .btn {
    flex: 1;
    min-width: 0;
    padding: 6px 4px;
    font-size: 11.5px;
    border-radius: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .hero-banner {
    padding: 16px;
    gap: 16px;
  }
  .generator-card {
    padding: 14px;
  }
  .gen-form-row {
    grid-template-columns: 1fr;
  }
  .exam-grid {
    grid-template-columns: 1fr;
  }
}

/* Container */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

body.exam-mode .container {
  padding-top: 10px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  border: none;
  transition: all 0.18s ease;
  font-family: inherit;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-success {
  background: var(--success);
  color: #fff;
  box-shadow: 0 4px 12px rgba(22, 163, 74, 0.25);
}
.btn-success:hover {
  background: #15803d;
  transform: translateY(-1px);
}

.btn-outline {
  background: #fff;
  color: var(--text);
  border: 2px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.btn-ghost-light {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}
.btn-ghost-light:hover {
  background: rgba(255, 255, 255, 0.26);
}

/* Hero & Generator Banner */
.hero-banner {
  background: linear-gradient(120deg, #eff6ff 0%, #f5f3ff 50%, #fffbeb 100%);
  border: 2px solid #bfdbfe;
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 28px;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 24px;
  align-items: center;
}

@media (max-width: 860px) {
  .hero-banner {
    grid-template-columns: 1fr;
  }
}

.hero-title {
  font-size: 24px;
  font-weight: 800;
  color: #1e3a8a;
  margin-bottom: 8px;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 15px;
  margin-bottom: 16px;
}

.generator-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 20px;
  border: 2px solid #e0e7ff;
  box-shadow: var(--shadow-sm);
}

.generator-card h3 {
  font-size: 17px;
  font-weight: 800;
  color: #1e293b;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.gen-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.form-select {
  width: 100%;
  padding: 9px 12px;
  border-radius: 10px;
  border: 2px solid var(--border);
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  background: #f8fafc;
}

/* Level Tabs */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.section-title {
  font-size: 20px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

.level-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.level-tab {
  padding: 8px 16px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: #fff;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
}

.level-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* Exam Cards Grid */
.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
  margin-bottom: 36px;
}

.exam-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.exam-card:hover {
  border-color: #93c5fd;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.exam-card.original-highlight {
  border-color: #f59e0b;
  background: linear-gradient(180deg, #fffbeb 0%, #ffffff 45%);
}

.exam-badges {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.badge-l1 { background: #dcfce7; color: #15803d; }
.badge-l2 { background: #dbeafe; color: #1d4ed8; }
.badge-l3 { background: #fae8ff; color: #86198f; }
.badge-orig { background: #fef3c7; color: #b45309; }

.exam-card h4 {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text);
}

.exam-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.exam-meta {
  display: flex;
  gap: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}

.exam-actions {
  display: flex;
  gap: 8px;
}

.exam-actions .btn {
  flex: 1;
  padding: 9px 12px;
  font-size: 14px;
}

/* Topic Practice Grid */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
  gap: 14px;
}

.topic-card {
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.18s;
}
.topic-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.topic-icon {
  font-size: 28px;
  margin-bottom: 8px;
}

.topic-card h4 {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 4px;
}

.topic-card p {
  font-size: 13px;
  color: var(--text-muted);
}

/* EXAM TAKING VIEW */
.exam-toolbar {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 2px solid var(--border);
  border-radius: 14px;
  padding: 8px 14px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  box-shadow: 0 -12px 0 6px var(--bg), 0 6px 20px rgba(15, 23, 42, 0.08);
  position: sticky;
  top: 6px;
  z-index: 150;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1;
}

.toolbar-back-btn {
  padding: 6px 10px;
  font-size: 13px;
  border-radius: 9px;
  flex-shrink: 0;
}

.toolbar-title-wrap {
  min-width: 0;
  flex: 1;
}

.toolbar-title {
  font-weight: 800;
  font-size: 15px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.toolbar-pdf-btn,
.toolbar-submit-btn {
  padding: 6px 12px;
  font-size: 13px;
  border-radius: 9px;
  white-space: nowrap;
}

.timer-pill {
  background: #fef3c7;
  color: #b45309;
  padding: 5px 11px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.progress-pill {
  background: #eff6ff;
  color: #1d4ed8;
  border: 1.5px solid #bfdbfe;
  padding: 5px 11px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  transition: all 0.15s;
}
.progress-pill:hover {
  background: #dbeafe;
}

.mobile-only-caret {
  display: none;
  font-size: 11px;
}

.view-Switch {
  display: inline-flex;
  background: #f1f5f9;
  padding: 3px;
  border-radius: 9px;
}

.view-switch-btn {
  padding: 5px 10px;
  border-radius: 7px;
  border: none;
  background: transparent;
  font-weight: 700;
  font-size: 12.5px;
  cursor: pointer;
  color: var(--text-muted);
  white-space: nowrap;
  font-family: inherit;
}
.view-switch-btn.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.exam-guide-banner {
  background: #f8fafc;
  border: 1px dashed #cbd5e1;
  border-radius: 10px;
  padding: 7px 14px;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.exam-layout {
  display: grid;
  grid-template-columns: 1fr 276px;
  gap: 18px;
  align-items: start;
}

@media (max-width: 1120px) {
  .hide-md {
    display: none;
  }
}

@media (max-width: 960px) {
  .exam-layout {
    grid-template-columns: 1fr;
  }
  .mobile-only-caret {
    display: inline;
  }
  .hide-sm {
    display: none;
  }
}

@media (max-width: 640px) {
  body.exam-mode .container {
    padding: 0 10px 48px;
  }
  .hide-xs {
    display: none;
  }
  .exam-toolbar {
    top: 0;
    margin: 0 -10px 8px -10px;
    border-radius: 0 0 12px 12px;
    border-top: none;
    border-left: none;
    border-right: none;
    padding: 6px 10px;
    flex-direction: column;
    align-items: stretch;
    gap: 5px;
  }
  .toolbar-left {
    width: 100%;
    gap: 8px;
  }
  .toolbar-back-btn {
    padding: 4px 8px;
    font-size: 12px;
  }
  .toolbar-title {
    font-size: 13.5px;
  }
  .toolbar-right {
    width: 100%;
    justify-content: space-between;
    gap: 4px;
  }
  .view-Switch {
    padding: 2px;
  }
  .view-switch-btn {
    padding: 4px 7px;
    font-size: 11.5px;
  }
  .progress-pill,
  .timer-pill {
    padding: 4px 8px;
    font-size: 12px;
  }
  .toolbar-pdf-btn {
    display: none;
  }
  .toolbar-submit-btn {
    padding: 5px 10px;
    font-size: 12px;
  }
  .exam-guide-banner {
    padding: 5px 10px;
    font-size: 11.5px;
    margin-bottom: 8px;
  }
}

/* Question Card (Matches Google Form + Kid-Friendly UI) */
.question-card {
  background: #ffffff;
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s;
  scroll-margin-top: 86px;
}

.question-card.answered {
  border-color: #93c5fd;
}

.question-card.review-correct {
  border-color: #22c55e;
  background: #f0fdf4;
}

.question-card.review-wrong {
  border-color: #ef4444;
  background: #fef2f2;
}

.q-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.q-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.q-num-badge {
  background: var(--primary);
  color: #fff;
  padding: 3px 10px;
  border-radius: 8px;
  font-weight: 800;
  font-size: 15px;
}

.q-cat-tag {
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}

.q-prompt {
  font-size: 18px;
  font-weight: 800;
  color: #0f172a;
  margin-top: 4px;
  line-height: 1.35;
}

.tts-btn {
  background: #eff6ff;
  color: var(--primary);
  border: 2px solid #bfdbfe;
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s;
}
.tts-btn:hover {
  background: var(--primary);
  color: #fff;
}

.q-visual {
  background: #ffffff;
  border: 1px solid #f1f5f9;
  border-radius: 12px;
  padding: 10px;
  margin-bottom: 12px;
  display: block;
  text-align: center;
  overflow: hidden;
}

.q-visual svg {
  width: 100% !important;
  height: auto !important;
  max-height: 195px;
  display: block;
  margin: 0 auto;
}

/* Options List & Visual / Compact Options Grid */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.options-list.compact-options-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.options-list.visual-options-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.option-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  border: 2px solid var(--border);
  border-radius: 12px;
  background: #ffffff;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 17px;
  font-weight: 700;
}

.compact-options-grid .option-item {
  justify-content: center;
  padding: 10px 8px;
  gap: 8px;
  text-align: center;
}

.visual-options-grid .option-item {
  flex-direction: column;
  justify-content: center;
  padding: 10px 8px;
  gap: 6px;
}

.opt-svg-wrap {
  width: 100%;
  display: block;
  text-align: center;
}

.opt-svg-wrap svg {
  width: 100% !important;
  height: auto !important;
  max-height: 100px;
  display: block;
  margin: 0 auto;
}

.opt-visual-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
}

@media (max-width: 640px) {
  .question-card {
    padding: 12px 12px;
    margin-bottom: 12px;
    border-radius: 14px;
  }
  .q-header {
    margin-bottom: 8px;
  }
  .q-num-badge {
    font-size: 13.5px;
    padding: 2px 8px;
  }
  .q-cat-tag {
    font-size: 11px;
    padding: 2px 8px;
  }
  .q-prompt {
    font-size: 15.5px;
    margin-top: 3px;
  }
  .tts-btn {
    width: 34px;
    height: 34px;
    font-size: 15px;
  }
  .q-visual {
    padding: 6px;
    margin-bottom: 10px;
  }
  .q-visual svg {
    width: 100% !important;
    height: auto !important;
    max-height: 165px;
  }
  .option-item {
    padding: 9px 10px;
    font-size: 15.5px;
    border-radius: 10px;
  }
  .compact-options-grid,
  .visual-options-grid {
    gap: 8px;
  }
  .compact-options-grid .option-item {
    padding: 9px 6px;
    gap: 6px;
  }
  .visual-options-grid .option-item {
    padding: 8px 4px;
  }
  .opt-svg-wrap svg {
    width: 100% !important;
    height: auto !important;
    max-height: 78px;
  }
  .opt-visual-label {
    font-size: 13px;
  }
}

.option-item:hover {
  border-color: #60a5fa;
  background: #f8fafc;
}

.option-item.selected {
  border-color: var(--primary);
  background: #eff6ff;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.option-item.correct-answer {
  border-color: #16a34a;
  background: #dcfce7;
}

.option-item.wrong-answer {
  border-color: #dc2626;
  background: #fee2e2;
}

.option-radio {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid #64748b;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  color: #475569;
  flex-shrink: 0;
}

.option-item.selected .option-radio {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.option-item.correct-answer .option-radio {
  border-color: #16a34a;
  background: #16a34a;
  color: #fff;
}

.option-item.wrong-answer .option-radio {
  border-color: #dc2626;
  background: #dc2626;
  color: #fff;
}

/* Explanation Box */
.explanation-box {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #fffbeb;
  border: 1.5px solid #fde68a;
  color: #92400e;
  font-size: 14px;
}

.explanation-box strong {
  display: block;
  margin-bottom: 4px;
  color: #78350f;
}

/* Flashcard Navigation */
.flashcard-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  gap: 10px;
}

/* Sidebar Question Palette */
.sidebar-card {
  background: #ffffff;
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  position: sticky;
  top: 72px;
  max-height: calc(100vh - 86px);
  overflow-y: auto;
}

.sidebar-card h4 {
  font-size: 14.5px;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text);
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-bottom: 14px;
}

.palette-btn {
  height: 34px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: #f8fafc;
  font-weight: 800;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.12s;
}

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

.palette-btn.current {
  outline: 2.5px solid #1e40af;
}

.palette-btn.done {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.palette-btn.rev-ok {
  background: #16a34a;
  color: #fff;
  border-color: #16a34a;
}

.palette-btn.rev-err {
  background: #dc2626;
  color: #fff;
  border-color: #dc2626;
}

/* Mobile Question Palette Drawer (Bottom Sheet) */
.mobile-palette-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  z-index: 200;
  align-items: flex-end;
  justify-content: center;
  padding: 12px;
}

.mobile-palette-overlay.open {
  display: flex;
}

.mobile-palette-sheet {
  background: #ffffff;
  width: 100%;
  max-width: 480px;
  border-radius: 20px;
  padding: 16px;
  box-shadow: 0 -8px 30px rgba(15, 23, 42, 0.2);
  max-height: 80vh;
  overflow-y: auto;
}

.mobile-palette-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.mobile-palette-header h4 {
  font-size: 16px;
  font-weight: 800;
}

.palette-close-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: #f1f5f9;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
}

.mobile-palette-grid {
  grid-template-columns: repeat(6, 1fr);
}

.mobile-palette-actions {
  display: flex;
  gap: 8px;
}

/* Results Summary Card */
.result-banner {
  background: #ffffff;
  border: 3px solid #60a5fa;
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-md);
}

.result-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 2px dashed var(--border);
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.score-circle .big-score {
  font-size: 34px;
  font-weight: 900;
  line-height: 1;
}

.score-circle .sub-score {
  font-size: 13px;
  opacity: 0.9;
  margin-top: 4px;
}

.skill-bars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
}

.skill-bar-card {
  background: #f8fafc;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
}

.skill-bar-head {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 800;
  margin-bottom: 6px;
}

.skill-track {
  height: 10px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  border-radius: 999px;
}

/* ==========================================
   MINIMAL-TEXT KID-WORLD UI & 500 EXAMS
   ========================================== */
.kid-exam-card {
  padding: 16px;
  gap: 12px;
}

.kid-card-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.kid-world-avatar {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  flex-shrink: 0;
}

.kid-card-info {
  flex: 1;
  min-width: 0;
}

.kid-card-title {
  font-size: 16.5px;
  font-weight: 800;
  color: #0f172a;
  margin: 0;
  line-height: 1.25;
}

.kid-exam-meta {
  padding-top: 8px;
  margin-bottom: 10px;
}

.qcount-chip {
  background: #eff6ff;
  color: #1d4ed8;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 800;
}

.count-filter-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-label {
  font-size: 13px;
  font-weight: 800;
  color: #475569;
  margin-right: 4px;
}

.world-filter-bar {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.world-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1.5px solid #cbd5e1;
  background: #ffffff;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  color: #334155;
  cursor: pointer;
  transition: all 0.15s ease;
}

.world-pill:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.world-pill.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 3px 8px rgba(37, 99, 235, 0.25);
}

.quick-jump-box {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.jump-input {
  width: 125px;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1.5px solid #cbd5e1;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
}

.pagination-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 22px 0 12px;
}

.pagination-info {
  font-size: 14px;
  font-weight: 700;
  color: #334155;
}

.kid-tts-btn {
  width: auto !important;
  height: 40px !important;
  border-radius: 999px !important;
  padding: 0 14px !important;
  gap: 5px;
  font-weight: 800;
  font-size: 15px !important;
  background: #eff6ff;
  border: 2px solid #93c5fd;
}

.kid-tts-btn .tts-label {
  font-size: 13.5px;
}

.btn-sm {
  padding: 6px 11px;
  font-size: 12.5px;
  border-radius: 9px;
  gap: 5px;
}

.hero-quick-btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.toolbar-tts-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1.5px solid #bfdbfe;
  background: #eff6ff;
  color: #1d4ed8;
  font-family: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.toolbar-tts-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.hero-banner > *,
.section-header,
.section-header > *,
.generator-card,
.gen-form-row > * {
  min-width: 0;
  max-width: 100%;
}

.form-select {
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

/* ==========================================
   GROUP-FIRST HOME HUB & DRILL-DOWN STYLES
   ========================================== */
.group-section-block {
  margin-bottom: 30px;
}

.group-section-header {
  margin-bottom: 14px;
}

.group-section-sub {
  font-size: 14px;
  color: #475569;
  font-weight: 600;
  margin-top: 2px;
}

.group-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(245px, 1fr));
  gap: 14px;
}

.world-hub-grid {
  grid-template-columns: repeat(auto-fill, minmax(225px, 1fr));
}

.group-hub-card {
  border-radius: 18px;
  border: 2px solid #e2e8f0;
  padding: 16px;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.04);
}

.group-hub-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.1);
}

.group-hub-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.group-hub-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.group-hub-count {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.group-hub-title {
  font-family: 'Baloo 2', cursive;
  font-size: 18.5px;
  line-height: 1.25;
  margin-bottom: 4px;
}

.group-hub-desc {
  font-size: 13px;
  color: #334155;
  font-weight: 600;
  line-height: 1.38;
  margin-bottom: 12px;
  flex: 1;
}

.group-hub-cta {
  font-size: 13px;
  font-weight: 900;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.8);
  padding: 6px 11px;
  border-radius: 10px;
  align-self: flex-start;
}

/* Group Drill-Down View (8 Exams per Page) */
.group-drilldown-box {
  background: #ffffff;
  border: 2px solid #cbd5e1;
  border-radius: 22px;
  padding: 18px;
  margin-bottom: 32px;
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.06);
}

.group-drilldown-header {
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 18px;
}

.group-drilldown-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.back-to-groups-btn {
  background: #ffffff !important;
  font-weight: 800;
}

.group-drilldown-main {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
}

.group-drilldown-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  flex-shrink: 0;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.06);
}

.drilldown-exam-grid {
  grid-template-columns: repeat(auto-fill, minmax(265px, 1fr));
}

.kid-card-sub {
  font-size: 12.5px;
  color: #64748b;
  font-weight: 600;
  margin-top: 2px;
  line-height: 1.35;
}

.pagination-numbers {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.empty-group-box {
  grid-column: 1 / -1;
  text-align: center;
  padding: 32px 16px;
  background: #f8fafc;
  border-radius: 16px;
  border: 1.5px dashed #cbd5e1;
}

@media (max-width: 640px) {
  .container {
    padding: 14px 12px 48px;
  }
  .hero-banner {
    padding: 16px 14px;
    gap: 16px;
    margin-bottom: 20px;
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 20px;
    line-height: 1.25;
  }
  .hero-desc {
    font-size: 13.5px;
  }
  .hero-quick-btns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .hero-quick-btns .btn {
    padding: 9px 8px;
    font-size: 12.5px;
    width: 100%;
  }
  .generator-card {
    padding: 14px 12px;
  }
  .gen-form-row {
    grid-template-columns: 1fr !important;
    gap: 8px;
    margin-bottom: 8px;
  }
  .form-select {
    font-size: 13.5px;
    padding: 8px 10px;
  }
  .section-header {
    gap: 10px;
    margin-bottom: 14px;
  }
  .section-title {
    font-size: 17.5px;
  }
  .group-hub-grid,
  .world-hub-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .group-hub-card {
    padding: 12px;
    border-radius: 14px;
  }
  .group-hub-icon {
    width: 38px;
    height: 38px;
    font-size: 20px;
    border-radius: 10px;
  }
  .group-hub-count {
    padding: 3px 8px;
    font-size: 11px;
  }
  .group-hub-title {
    font-size: 15px;
  }
  .group-hub-desc {
    font-size: 11.5px;
    margin-bottom: 8px;
  }
  .group-hub-cta {
    font-size: 11.5px;
    padding: 4px 8px;
  }
  .group-drilldown-box {
    padding: 12px;
    border-radius: 16px;
  }
  .group-drilldown-header {
    padding: 12px;
  }
  .group-drilldown-main {
    gap: 10px;
  }
  .group-drilldown-icon {
    width: 44px;
    height: 44px;
    font-size: 24px;
  }
  .quick-jump-box {
    width: 100%;
  }
  .jump-input {
    flex: 1;
    width: auto;
  }
  .level-tabs {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
  }
  .level-tab {
    padding: 6px 4px;
    font-size: 11.5px;
    text-align: center;
    white-space: nowrap;
  }
  .count-filter-bar {
    gap: 6px;
  }
  .count-filter-bar .btn-sm {
    padding: 5px 8px;
    font-size: 11.5px;
  }
  .world-filter-bar {
    flex-wrap: wrap;
    gap: 5px;
  }
  .world-pill {
    padding: 5px 9px;
    font-size: 11.5px;
    flex-shrink: 0;
  }
  .exam-grid,
  .drilldown-exam-grid {
    grid-template-columns: 1fr !important;
    gap: 12px;
  }
  .topic-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .kid-tts-btn {
    height: 34px !important;
    padding: 0 10px !important;
  }
  .kid-tts-btn .tts-label {
    font-size: 12px;
  }
  .toolbar-tts-btn {
    padding: 4px 8px;
    font-size: 11.5px;
  }
}

/* PRINT PDF STYLES (A4 Exam Paper) */
.print-only-header,
.print-only-answer-key {
  display: none;
}

@media print {
  body {
    background: #ffffff;
    font-size: 12pt;
  }
  .app-header,
  .exam-toolbar,
  .sidebar-card,
  .flashcard-nav,
  .tts-btn,
  .no-print {
    display: none !important;
  }
  .container {
    max-width: 100%;
    padding: 0;
    margin: 0;
  }
  .exam-layout {
    display: block;
  }
  .print-only-header {
    display: block;
    border: 2px solid #000;
    padding: 14px;
    margin-bottom: 18px;
    border-radius: 8px;
  }
  .question-card {
    page-break-inside: avoid;
    break-inside: avoid;
    border: 1.5px solid #cbd5e1;
    box-shadow: none;
    margin-bottom: 14px;
    padding: 14px;
  }
  .print-only-answer-key {
    display: block;
    page-break-before: always;
    padding-top: 20px;
  }
  .answer-key-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-top: 12px;
  }
  .answer-key-cell {
    border: 1px solid #64748b;
    padding: 6px;
    text-align: center;
    font-weight: 700;
  }
}