/* ============================================================
   WRITS POLLS — teacher.css
   Teacher-facing layout: auth pages, sidebar, dashboard tiles
   Imports base.css first (layout.php / auth pages link both)
   ============================================================ */

/* ── 1. Auth pages ────────────────────────────────────────── */
.auth-page {
  min-height: 100svh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: var(--space-6) var(--space-4) var(--space-12);
  background: linear-gradient(145deg, #002B42 0%, #003d5c 55%, #002B42 100%);
}

@media (min-width: 600px) {
  .auth-page { align-items: center; }
}

.auth-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-8);
  width: 100%;
  max-width: 440px;
  margin-top: var(--space-8);
}

@media (min-width: 600px) {
  .auth-card { margin-top: 0; }
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.auth-brand-logo {
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  flex-shrink: 0;
  object-fit: contain;
  display: block;
}

.auth-brand-name {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.3px;
}

.auth-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-1);
}

.auth-subtitle {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: var(--space-6);
}

.auth-form { display: flex; flex-direction: column; gap: var(--space-4); }

.auth-footer-link {
  margin-top: var(--space-5);
  text-align: center;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* ── 2. App chrome: layout wrapper ───────────────────────── */
.app-layout {
  display: flex;
  min-height: 100svh;
}

/* ── 3. Sidebar (desktop ≥ 1024px) ───────────────────────── */
.sidebar {
  width: 248px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100svh;
  overflow-y: auto;
  z-index: 20;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-brand-logo {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  object-fit: contain;
  display: block;
}

.sidebar-brand-name {
  font-size: 0.9375rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.2px;
  line-height: 1.1;
}

.sidebar-brand-name small {
  display: block;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-3) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
  min-height: 44px;
}

.nav-link svg { width: 20px; height: 20px; flex-shrink: 0; }

.nav-link:hover { background: var(--bg); color: var(--text); text-decoration: none; }

.nav-link.is-active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.nav-link.is-disabled {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

.nav-section-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: var(--space-3) var(--space-3) var(--space-1);
  margin-top: var(--space-2);
}

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-4) var(--space-4);
  flex-shrink: 0;
}

.teacher-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.teacher-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  background: var(--avatar-bg, var(--primary));
}

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

.teacher-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.teacher-email {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.logout-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 8px var(--space-3);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  min-height: 36px;
}
.logout-btn:hover { background: #fef2f2; color: var(--danger); }
.logout-btn svg { width: 16px; height: 16px; }

/* ── 4. Main content area ─────────────────────────────────── */
.main-content {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
}

.content-inner {
  padding: var(--space-6) var(--space-8);
  max-width: 1200px;
  width: 100%;
}

@media (max-width: 767px) {
  .content-inner { padding: var(--space-4) var(--space-4); }
}

/* ── 5. Page header ───────────────────────────────────────── */
.page-header {
  padding: var(--space-6) var(--space-8) 0;
  max-width: 1200px;
  width: 100%;
}

.page-header-greeting {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.page-header-sub {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-top: var(--space-1);
}

@media (max-width: 767px) {
  .page-header { padding: var(--space-4) var(--space-4) 0; }
}

/* ── 6. Dashboard tile grid ───────────────────────────────── */
.tile-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
  padding: var(--space-6) var(--space-8);
  max-width: 1200px;
  width: 100%;
}

@media (max-width: 900px) {
  .tile-grid { grid-template-columns: 1fr; padding: var(--space-4) var(--space-4); }
}

.tile {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  min-height: 200px;
}
.tile:hover { box-shadow: var(--shadow-md); }

.tile-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.tile-title-group { display: flex; align-items: center; gap: var(--space-3); }

.tile-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.tile-icon svg { width: 22px; height: 22px; }

.tile-icon-indigo { background: var(--primary-light); color: var(--primary); }
.tile-icon-coral  { background: #ffe4e6; color: #be123c; }
.tile-icon-mint   { background: #dcfce7; color: #166534; }
.tile-icon-amber  { background: #fef9c3; color: #a16207; }

.tile-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.tile-count {
  font-size: 1.625rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}

.tile-body { flex: 1; display: flex; flex-direction: column; justify-content: center; }

.tile-list { display: flex; flex-direction: column; gap: var(--space-2); }

.tile-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
}
.tile-list-item:last-child { border-bottom: none; }

.tile-list-item-label {
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tile-list-item-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* CTA tile (Start New Session) */
.tile--cta {
  background: linear-gradient(135deg, #C90000 0%, #8B0000 100%);
  border-color: transparent;
  color: #fff;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.tile--cta::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 200px; height: 200px;
  background: rgb(255 255 255 / 0.06);
  border-radius: 50%;
  pointer-events: none;
}
.tile--cta .tile-title { color: #fff; }
.tile--cta:hover { box-shadow: 0 8px 24px rgb(201 0 0 / 0.45); transform: translateY(-1px); }

.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
  height: 100%;
  justify-content: space-between;
}

.cta-icon {
  width: 52px; height: 52px;
  background: rgb(255 255 255 / 0.15);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}
.cta-icon svg { width: 28px; height: 28px; color: #fff; }

.cta-text-group { flex: 1; }

.cta-headline {
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: var(--space-2);
}

.cta-subline {
  font-size: 0.9375rem;
  color: rgb(255 255 255 / 0.75);
  line-height: 1.4;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 11px 20px;
  background: #fff;
  color: var(--primary);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
  min-height: 44px;
}
.cta-btn:hover { background: #FDEAEA; }
.cta-btn:active { transform: scale(0.97); }
.cta-btn svg { width: 18px; height: 18px; }

/* Batch chips cluster inside tile */
.chips-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ── 7. Bottom navigation (tablet portrait / mobile) ──────── */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: var(--space-2) var(--space-2) env(safe-area-inset-bottom, var(--space-2));
  z-index: 20;
}

.bottom-nav-inner {
  display: flex;
  justify-content: space-around;
  align-items: center;
  max-width: 500px;
  margin: 0 auto;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.6875rem;
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast), background var(--transition-fast);
  min-width: 56px;
  min-height: 48px;
  justify-content: center;
}
.bottom-nav-item svg { width: 22px; height: 22px; }
.bottom-nav-item:hover, .bottom-nav-item.is-active { color: var(--primary); text-decoration: none; }
.bottom-nav-item.is-active { background: var(--primary-light); }

/* ── 8. Top mobile header (replaces sidebar on mobile) ────── */
.mobile-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.mobile-header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.9375rem;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
}

.mobile-header-brand-logo {
  width: 30px; height: 30px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  object-fit: contain;
  display: block;
}

/* ── 9. Responsive breakpoints ────────────────────────────── */
@media (max-width: 1023px) {
  .sidebar      { display: none; }
  .bottom-nav   { display: flex; }
  .mobile-header { display: flex; }
  .main-content  { padding-bottom: 80px; } /* room for bottom nav */
  .tile-grid { padding: var(--space-4); }
  .page-header { padding: var(--space-4) var(--space-4) 0; }
}

/* ── 10. Misc teacher components ──────────────────────────── */

/* Stat number (used inside tiles) */
.stat-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}
.stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}
.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ── 11. Modals ───────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgb(0 0 0 / 0.45);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  overflow-y: auto;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: modal-in 0.18s ease;
}

@keyframes modal-in {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
}

.modal-close {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.modal-close:hover { background: var(--bg); color: var(--text); }

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* ── 11b. Quiz picker (Start Session modal) ───────────────── */
.quiz-pick-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.quiz-pick-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.quiz-pick-item:hover { border-color: var(--primary); background: var(--primary-light); }
.quiz-pick-item.is-selected {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}
.quiz-pick-item.is-selected::before {
  content: '✓';
  font-weight: 800;
  color: var(--primary);
  flex-shrink: 0;
}

.modal-launch-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: var(--space-4);
}

/* ── 12. Quiz list page ───────────────────────────────────── */
.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.quiz-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}
.quiz-card:hover { box-shadow: var(--shadow-md); border-color: #d4d4d8; }

.quiz-card-body { flex: 1; min-width: 0; }

.quiz-card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.quiz-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: 4px;
}

.quiz-card-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.quiz-card-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-shrink: 0;
}

.quiz-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-16) var(--space-4);
  color: var(--text-muted);
}

/* ── 13. Quiz edit page header ────────────────────────────── */
.quiz-edit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
}

.quiz-edit-title-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 1;
  min-width: 0;
}

.quiz-inline-title-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.quiz-inline-title {
  font-size: 1.375rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 400px;
}

.quiz-title-edit-btn {
  background: transparent;
  border: none;
  padding: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  transition: background var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}
.quiz-title-edit-btn:hover { background: var(--bg); color: var(--text); }

.quiz-inline-title-edit {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.quiz-title-input {
  min-height: 40px;
  font-size: 1.125rem;
  font-weight: 600;
  max-width: 360px;
}

.quiz-edit-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ── 14. Question list ────────────────────────────────────── */
.question-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.question-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast),
              opacity var(--transition-fast);
  cursor: default;
}
.question-row:hover { border-color: #d4d4d8; box-shadow: var(--shadow-sm); }
.question-row.is-dragging { opacity: 0.4; }
.question-row.drag-over   { border-color: var(--primary); box-shadow: 0 0 0 2px rgb(79 70 229 / 0.2); }

.question-row-drag {
  color: var(--text-muted);
  cursor: grab;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  touch-action: none;
  transition: color var(--transition-fast);
}
.question-row-drag:hover { color: var(--text); }
.question-row-drag:active { cursor: grabbing; }

.question-row-pos {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.question-row-body {
  flex: 1;
  min-width: 0;
}

.question-row-text {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.question-row-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: 3px;
}

.question-correct-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.question-time-badge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 8px;
}

.question-row-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-shrink: 0;
}

.question-list-footer {
  margin-top: var(--space-4);
  padding-bottom: var(--space-8);
}

/* ── 15. Question editor modal — options grid ─────────────── */
.option-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.option-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  position: relative;
}

.option-label {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

.option-label .option-radio {
  position: absolute;
  opacity: 0;
  width: 0; height: 0;
}

.option-letter {
  font-size: 0.9375rem;
  font-weight: 700;
}

/* Option A = coral */
.option-label-coral { border-color: var(--accent-coral); background: #fff1f2; color: #9f1239; }
.option-label-coral:has(.option-radio:checked) { background: var(--accent-coral); color: #fff; }
/* Option B = mint */
.option-label-mint  { border-color: var(--accent-mint);  background: #f0fdf4; color: #15803d; }
.option-label-mint:has(.option-radio:checked)  { background: var(--accent-mint);  color: #fff; }
/* Option C = amber */
.option-label-amber { border-color: var(--accent-amber); background: #fffbeb; color: #92400e; }
.option-label-amber:has(.option-radio:checked) { background: var(--accent-amber); color: #fff; }
/* Option D = sky */
.option-label-sky   { border-color: var(--accent-sky);   background: #f0f9ff; color: #075985; }
.option-label-sky:has(.option-radio:checked)   { background: var(--accent-sky);   color: #fff; }

.option-input { flex: 1; }

/* Time limit row */
.time-limit-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-1);
}

.time-range {
  flex: 1;
  accent-color: var(--primary);
  height: 4px;
  cursor: pointer;
}

.time-number {
  width: 72px;
  min-height: 40px;
  text-align: center;
}

.time-unit {
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ── 16. Bulk import modal ────────────────────────────────── */
/* Import format tabs */
.import-tab {
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
}
.import-tab:hover { color: var(--text); }
.import-tab.is-active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.import-info {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.import-columns-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.import-col {
  background: var(--primary-light);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
}

.import-preview-banner {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  margin-bottom: var(--space-3);
}
.import-preview-banner--ok    { background: #f0fdf4; border: 1px solid #bbf7d0; color: #166534; }
.import-preview-banner--error { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; }

.import-preview-scroll {
  max-height: 400px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin: 0 var(--space-6);
}

.import-preview-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.import-preview-table th,
.import-preview-table td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.import-preview-table th {
  background: var(--bg);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  position: sticky;
  top: 0;
  z-index: 1;
}

.import-preview-table tr.import-row-error td {
  background: #fff8f8;
}

.import-cell-num { color: var(--text-muted); width: 36px; }

/* Color-coded option cells in preview */
.import-opt-cell { max-width: 120px; }
.opt-a { border-left: 3px solid var(--accent-coral); padding-left: 6px; }
.opt-b { border-left: 3px solid var(--accent-mint);  padding-left: 6px; }
.opt-c { border-left: 3px solid var(--accent-amber); padding-left: 6px; }
.opt-d { border-left: 3px solid var(--accent-sky);   padding-left: 6px; }

.import-correct {
  font-weight: 700;
  font-size: 0.875rem;
}
.import-correct.opt-a { color: #9f1239; }
.import-correct.opt-b { color: #15803d; }
.import-correct.opt-c { color: #92400e; }
.import-correct.opt-d { color: #075985; }

.import-status-ok {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: #dcfce7;
  color: #15803d;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.import-status-err {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: #fee2e2;
  color: #991b1b;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

.import-error-list {
  list-style: disc;
  padding-left: 1.2em;
  margin-top: var(--space-1);
  color: #991b1b;
  font-size: 0.8125rem;
  line-height: 1.5;
}

/* ── 17. Responsive tweaks for new pages ──────────────────── */
@media (max-width: 767px) {
  .quiz-edit-header   { flex-direction: column; align-items: flex-start; }
  .quiz-edit-actions  { flex-wrap: wrap; }
  .quiz-inline-title  { font-size: 1.125rem; max-width: 220px; }
  .option-grid        { gap: var(--space-2); }
  .modal-body         { padding: var(--space-4); }
  .modal-footer       { padding: var(--space-3) var(--space-4); }
  .modal-header       { padding: var(--space-4); }
  .import-preview-scroll { margin: 0 var(--space-3); }
  .time-limit-row     { flex-wrap: wrap; }
  .quiz-grid          { grid-template-columns: 1fr; }
  .quiz-card-actions  { flex-wrap: wrap; }
}

/* ══════════════════════════════════════════════════════════════
   PHASE 4 — Batch management
   ══════════════════════════════════════════════════════════════ */

/* ── 18. Inline create form ──────────────────────────────────── */
.batch-create-form {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.batch-name-input {
  max-width: 340px;
  flex: 1;
  min-width: 180px;
}

/* ── 19. Batch card grid ─────────────────────────────────────── */
.batch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.batch-card {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1.5px solid transparent;
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: box-shadow var(--transition-base), transform var(--transition-fast);
}
.batch-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* Four color variants — 15% opacity bg, full-sat text, matching border */
.batch-card-coral {
  background: rgb(251 113 133 / 0.10);
  border-color: rgb(251 113 133 / 0.40);
  color: #9f1239;
}
.batch-card-mint {
  background: rgb(52 211 153 / 0.10);
  border-color: rgb(52 211 153 / 0.40);
  color: #166534;
}
.batch-card-amber {
  background: rgb(251 191 36 / 0.10);
  border-color: rgb(251 191 36 / 0.40);
  color: #92400e;
}
.batch-card-sky {
  background: rgb(56 189 248 / 0.10);
  border-color: rgb(56 189 248 / 0.40);
  color: #075985;
}

.batch-card-top {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-right: 2rem; /* room for delete btn */
}

.batch-name-display {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.batch-name-text {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.2;
  word-break: break-word;
}

.batch-name-edit {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.batch-name-edit .form-input {
  font-weight: 600;
}

.batch-name-edit > div {
  display: flex;
  gap: var(--space-2);
}

/* Inline rename controls row */
.batch-name-edit {
  gap: var(--space-2);
}

.batch-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.batch-meta-item {
  font-size: 0.8125rem;
  opacity: 0.7;
}

.batch-usage-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgb(0 0 0 / 0.08);
}

.batch-unused-badge {
  font-size: 0.75rem;
  font-weight: 500;
  opacity: 0.55;
}

/* ── 20. Icon buttons ────────────────────────────────────────── */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}
.icon-btn:hover       { opacity: 1; background: rgb(0 0 0 / 0.07); }
.icon-btn-danger:hover { color: var(--danger); background: #fee2e2; opacity: 1; }

/* Delete button positioned top-right of card */
.batch-delete-btn {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
}

/* ── 21. Batch chips (used in dropdown + any chip context) ──── */
.batch-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1.5px solid transparent;
}
.batch-chip-coral  { background: rgb(251 113 133 / 0.12); color: #9f1239; border-color: rgb(251 113 133 / 0.35); }
.batch-chip-mint   { background: rgb(52 211 153 / 0.12);  color: #166534; border-color: rgb(52 211 153  / 0.35); }
.batch-chip-amber  { background: rgb(251 191 36 / 0.12);  color: #92400e; border-color: rgb(251 191 36 / 0.35); }
.batch-chip-sky    { background: rgb(56 189 248 / 0.12);   color: #075985; border-color: rgb(56 189 248  / 0.35); }

/* ── 22. Batch empty state ───────────────────────────────────── */
.batch-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-12) var(--space-4);
  color: var(--text-muted);
}

/* ── 23. Batch rename inline layout ─────────────────────────── */
.batch-rename-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ── 24. Responsive ──────────────────────────────────────────── */
@media (max-width: 767px) {
  .batch-grid         { grid-template-columns: 1fr; }
  .batch-create-form  { flex-direction: column; }
  .batch-name-input   { max-width: 100%; }
}

/* Manage link inside dashboard tile */
.tile-manage-link {
  display: inline-block;
  margin-top: var(--space-3);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
}
.tile-manage-link:hover { text-decoration: underline; }

/* ══════════════════════════════════════════════════════════════
   PHASE 9 — Dark mode, polish, skeleton screens
   ══════════════════════════════════════════════════════════════ */

/* ── Dark mode toggle button (sidebar + mobile header) ───────── */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 36px;
  padding: 6px var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  gap: var(--space-2);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.theme-toggle-btn:hover { background: var(--surface-elev); color: var(--text); }
.theme-toggle-btn:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* Show sun in light mode, moon in dark mode */
.theme-toggle-btn .theme-icon-dark  { display: none; }
[data-theme="dark"] .theme-toggle-btn .theme-icon-light { display: none; }
[data-theme="dark"] .theme-toggle-btn .theme-icon-dark  { display: inline; }

/* ── Teacher page skeleton screens ───────────────────────────── */
.quiz-card-skeleton {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* ── Logout button dark mode ──────────────────────────────────── */
[data-theme="dark"] .logout-btn:hover { background: #450a0a; color: #fca5a5; }

/* ── Modal dark mode ─────────────────────────────────────────── */
[data-theme="dark"] .modal-overlay { background: rgb(0 0 0 / 0.65); }

/* ── Quiz defaults settings bar (quiz editor) ────────────────── */
.quiz-defaults-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0 var(--space-3);
  flex-wrap: wrap;
}

.quiz-defaults-chips {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.qd-chip {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface-elev);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 2px 10px;
  white-space: nowrap;
}

.qd-chip-ok    { color: #15803d; background: #f0fdf4; border-color: #bbf7d0; }
.qd-chip-bad   { color: #9f1239; background: #fff1f2; border-color: #fecdd3; }
.qd-chip-bonus { color: #92400e; background: #fffbeb; border-color: #fde68a; }
.qd-hint { font-size: 0.75rem; color: var(--text-muted); margin-left: var(--space-1); }

[data-theme="dark"] .qd-chip        { color: #a1a1aa; background: #27272a; border-color: #3f3f46; }
[data-theme="dark"] .qd-chip-ok     { color: #4ade80; background: #052e16; border-color: #166534; }
[data-theme="dark"] .qd-chip-bad    { color: #fb7185; background: #4c0519; border-color: #9f1239; }
[data-theme="dark"] .qd-chip-bonus  { color: #fbbf24; background: #451a03; border-color: #92400e; }