/* ============================================
   Grades Page — Specific Styles
   Extends base styles.css + students.css
   ============================================ */

/* ---- Grades Toolbar & Search ---- */
.grades-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.grades-search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  min-width: 200px;
  max-width: 280px;
}

.grades-search-icon {
  position: absolute;
  left: 10px;
  font-size: 18px;
  color: var(--text-tertiary);
  pointer-events: none;
}

.grades-search-input {
  width: 100%;
  padding: 7px 30px 7px 34px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  font-size: 0.84rem;
  color: var(--text-primary);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.grades-search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.15);
  outline: none;
}

.grades-search-clear {
  position: absolute;
  right: 6px;
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.grades-search-clear:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

/* ---- View Switcher ---- */
.grades-view-switcher {
  display: flex;
  background: var(--bg-secondary);
  padding: 3px;
  border-radius: var(--radius-sm);
  gap: 2px;
}

.grades-view-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: calc(var(--radius-sm) - 2px);
  cursor: pointer;
  transition: all var(--t-fast);
}

.grades-view-btn .material-symbols-rounded {
  font-size: 16px;
}

.grades-view-btn:hover {
  color: var(--text-primary);
}

.grades-view-btn.is-active {
  background: var(--bg-card);
  color: var(--accent);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  font-weight: 600;
}

/* ---- KPI Grid (Smart Summary) ---- */
.grades-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.grades-kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: var(--card-shadow);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}

.grades-kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
}

.grades-kpi-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.grades-kpi-icon-wrap.accent {
  background: rgba(66, 133, 244, 0.12);
  color: var(--accent);
}

.grades-kpi-icon-wrap.success {
  background: rgba(16, 185, 129, 0.12);
  color: var(--success);
}

.grades-kpi-icon-wrap.info {
  background: rgba(59, 130, 246, 0.12);
  color: var(--info);
}

.grades-kpi-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.grades-kpi-label {
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.grades-kpi-value-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.grades-kpi-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.grades-kpi-value.success {
  color: var(--success);
}

.grades-kpi-sub {
  font-size: 0.76rem;
  color: var(--text-secondary);
}

.grades-kpi-trend {
  font-size: 0.74rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 10px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.grades-kpi-trend.down {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.grades-kpi-score-range {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
}

.grades-kpi-score-range strong.info {
  color: var(--info);
}

.grades-kpi-score-range strong.danger {
  color: var(--danger);
}

.grades-kpi-score-range .sep {
  color: var(--text-tertiary);
  margin: 0 4px;
  font-weight: 400;
}

/* Sparkline Card */
.grades-kpi-sparkline-card {
  flex-direction: column;
  align-items: stretch;
  justify-content: space-between;
}

.grades-kpi-sparkline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.grades-kpi-sparkline-hint {
  font-size: 0.72rem;
  color: var(--text-tertiary);
}

.grades-sparkline-container {
  height: 28px;
  width: 100%;
  display: flex;
  align-items: center;
}

.grades-sparkline-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* ---- Filter Tags Bar ---- */
.grades-filter-tags-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.grades-filter-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--t-fast);
}

.grades-filter-tag:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.grades-filter-tag.is-active {
  background: rgba(66, 133, 244, 0.08);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.grades-filter-tag .tag-count {
  font-size: 0.74rem;
  padding: 1px 6px;
  border-radius: 10px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.grades-filter-tag.is-active .tag-count {
  background: var(--accent);
  color: #fff;
}

.grades-filter-tag .tag-icon {
  font-size: 16px;
}

.grades-filter-tag .tag-icon.warn { color: var(--warning); }
.grades-filter-tag .tag-icon.success { color: var(--success); }
.grades-filter-tag .tag-icon.danger { color: var(--danger); }

/* ---- Exam List ---- */
.exam-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ---- Ergonomic Exam Card ---- */
.exam-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  cursor: pointer;
  transition: all var(--t-base);
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
  display: flex;
  gap: 18px;
  align-items: stretch;
}

.exam-card:hover {
  border-color: rgba(66, 133, 244, 0.35);
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-1px);
}

/* Hero Score Badge (Cột trái) */
.exam-hero-score-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 80px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  flex-shrink: 0;
  text-align: center;
  transition: transform var(--t-fast);
}

.exam-card:hover .exam-hero-score-badge {
  transform: scale(1.03);
}

.exam-hero-score-badge .hero-score-label {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-tertiary);
  margin-bottom: 2px;
}

.exam-hero-score-badge .hero-score-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
}

.exam-hero-score-badge .hero-score-rating {
  font-size: 0.7rem;
  font-weight: 600;
  margin-top: 4px;
  padding: 2px 6px;
  border-radius: 6px;
}

/* Hero Score Color Modifiers */
.exam-hero-score-badge.excellent {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.3);
}
.exam-hero-score-badge.excellent .hero-score-num { color: #059669; }
.exam-hero-score-badge.excellent .hero-score-rating {
  background: rgba(16, 185, 129, 0.16);
  color: #047857;
}

.exam-hero-score-badge.good {
  background: rgba(37, 99, 235, 0.08);
  border-color: rgba(37, 99, 235, 0.3);
}
.exam-hero-score-badge.good .hero-score-num { color: #2563eb; }
.exam-hero-score-badge.good .hero-score-rating {
  background: rgba(37, 99, 235, 0.16);
  color: #1d4ed8;
}

.exam-hero-score-badge.average {
  background: rgba(217, 119, 6, 0.08);
  border-color: rgba(217, 119, 6, 0.3);
}
.exam-hero-score-badge.average .hero-score-num { color: #d97706; }
.exam-hero-score-badge.average .hero-score-rating {
  background: rgba(217, 119, 6, 0.16);
  color: #b45309;
}

.exam-hero-score-badge.poor {
  background: rgba(220, 38, 38, 0.08);
  border-color: rgba(220, 38, 38, 0.3);
}
.exam-hero-score-badge.poor .hero-score-num { color: #dc2626; }
.exam-hero-score-badge.poor .hero-score-rating {
  background: rgba(220, 38, 38, 0.16);
  color: #b91c1c;
}

/* Exam Card Main Content (Cột phải) */
.exam-card-main {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  justify-content: space-between;
  gap: 10px;
}

.exam-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.exam-card-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  flex: 1;
}

.exam-card-name-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.exam-card-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exam-card-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.exam-card-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

.exam-card-meta-item .material-symbols-rounded {
  font-size: 15px;
}

.exam-card-meta-item.status-done {
  color: var(--success);
  font-weight: 500;
}

.exam-card-meta-item.status-pending {
  color: var(--warning);
  font-weight: 500;
}

.exam-card-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
  opacity: 0.88;
  transition: opacity var(--t-fast);
}

.exam-card:hover .exam-card-actions {
  opacity: 1;
}

/* Exam stats & distribution row */
.exam-card-body-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 8px;
  border-top: 1px solid var(--border-color);
}

.exam-card-stats {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.exam-stat-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.exam-stat-chip .stat-value {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  color: var(--text-primary);
}

.exam-stat-chip.max .stat-value { color: var(--info); }
.exam-stat-chip.min .stat-value { color: var(--danger); }

/* ---- Score Distribution Bar (10px Ergonomic) ---- */
.score-dist-wrapper {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 180px;
  max-width: 320px;
}

.score-dist-legend {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-tertiary);
}

.score-dist-bar {
  display: flex;
  height: 9px;
  border-radius: 5px;
  overflow: hidden;
  background: var(--bg-secondary);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.06);
}

.score-dist-seg {
  height: 100%;
  transition: width 0.4s var(--ease-out);
  position: relative;
}

.score-dist-seg.excellent { background: #059669; }
.score-dist-seg.good { background: #2563eb; }
.score-dist-seg.average { background: #d97706; }
.score-dist-seg.poor { background: #dc2626; }

/* ---- Matrix View Styles ---- */
.grades-matrix-container {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  overflow-x: auto;
  max-height: 70vh;
}

.gradebook-matrix-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.85rem;
}

.gradebook-matrix-table th,
.gradebook-matrix-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  white-space: nowrap;
  text-align: center;
}

.gradebook-matrix-table th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-secondary);
  position: sticky;
  top: 0;
  z-index: 10;
}

.gradebook-matrix-table th.sticky-col,
.gradebook-matrix-table td.sticky-col {
  position: sticky;
  left: 0;
  background: var(--bg-card);
  z-index: 5;
  text-align: left;
}

.gradebook-matrix-table th.sticky-col {
  z-index: 15;
  background: var(--bg-secondary);
}

.gradebook-matrix-table td.score-cell {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
}

.gradebook-matrix-table td.score-cell.high {
  background: rgba(16, 185, 129, 0.08);
  color: #059669;
}

.gradebook-matrix-table td.score-cell.low {
  background: rgba(220, 38, 38, 0.08);
  color: #dc2626;
}

.gradebook-matrix-table tr:hover td {
  background: var(--bg-hover);
}

.score-dist-seg.excellent { background: #059669; }
.score-dist-seg.good { background: #2563eb; }
.score-dist-seg.average { background: #d97706; }
.score-dist-seg.poor { background: #dc2626; }

/* ---- Modal Specifics ---- */
.modal-lg {
  max-width: 760px;
  width: 92vw;
}

.form-row {
  display: flex;
  gap: 14px;
  align-items: flex-end;
}

.form-row .flex-1 { flex: 1; }
.form-row .flex-2 { flex: 2; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 9px 12px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.86rem;
  color: var(--text-primary);
  background: var(--bg-card);
  outline: none;
  transition: all var(--t-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-divider {
  height: 1px;
  background: var(--bg-secondary);
  margin: 18px 0;
}

.section-subtitle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.section-subtitle .material-symbols-rounded {
  font-size: 19px;
  color: var(--accent);
}

.required {
  color: var(--danger);
}

/* ---- Score Entry Card (in modal) ---- */
.score-entry-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.score-entry {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 14px;
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
  transition: background var(--t-fast);
}

.score-entry:hover {
  background: var(--bg-active);
}

.score-entry-index {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 24px;
}

.score-entry-name {
  flex: 1;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.score-entry input[type="number"] {
  width: 72px;
  padding: 7px 10px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-card);
  outline: none;
  text-align: center;
  transition: all var(--t-fast);
}

.score-entry input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.score-entry input[type="text"],
.score-entry textarea {
  flex: 1.2;
  padding: 7px 10px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  outline: none;
  transition: all var(--t-fast);
  resize: none;
}

.score-entry input[type="text"]:focus,
.score-entry textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.score-entry-labels {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 14px 6px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.score-entry-labels .lbl-idx { min-width: 24px; }
.score-entry-labels .lbl-name { flex: 1; }
.score-entry-labels .lbl-score { width: 72px; text-align: center; }
.score-entry-labels .lbl-comment { flex: 1.2; }

/* ---- Detail Modal ---- */
.detail-modal-title-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.detail-modal-date {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

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

.btn-danger-outline {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  background: transparent;
  color: var(--danger);
  border: 1px solid rgba(220, 38, 38, 0.25);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t-fast);
}

.btn-danger-outline:hover {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.btn-danger-outline .material-symbols-rounded {
  font-size: 16px;
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 9px 18px;
  background: var(--danger);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t-fast);
}

.btn-danger:hover {
  background: #b91c1c;
}

.btn-danger .material-symbols-rounded {
  font-size: 17px;
}

/* Exam Stats Row */
.exam-stats-row {
  display: flex;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.exam-stat-card {
  flex: 1;
  min-width: 100px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.exam-stat-card.stat-avg {
  background: var(--success-bg);
}

.exam-stat-card.stat-max {
  background: var(--info-bg);
}

.exam-stat-card.stat-min {
  background: var(--danger-bg);
}

.exam-stat-card.stat-count {
  background: var(--accent-bg);
}

.exam-stat-card .stat-label {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.exam-stat-card .stat-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
}

.exam-stat-card.stat-avg .stat-value { color: var(--success); }
.exam-stat-card.stat-max .stat-value { color: var(--info); }
.exam-stat-card.stat-min .stat-value { color: var(--danger); }
.exam-stat-card.stat-count .stat-value { color: var(--accent); }

/* Detail table */
.detail-table-wrapper {
  overflow-x: auto;
}

.detail-table-wrapper .data-table th,
.detail-table-wrapper .data-table td {
  white-space: nowrap;
}

.detail-table-wrapper .data-table td:last-child {
  white-space: normal;
  max-width: 220px;
}

/* Score badge */
.score-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  padding: 3px 10px;
  border-radius: 20px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.88rem;
  font-weight: 700;
}

.score-badge.excellent {
  background: var(--success-bg);
  color: var(--success);
}

.score-badge.good {
  background: var(--info-bg);
  color: var(--info);
}

.score-badge.average {
  background: var(--warning-bg);
  color: var(--warning);
}

.score-badge.poor {
  background: var(--danger-bg);
  color: var(--danger);
}

.score-badge.none {
  background: var(--bg-secondary);
  color: var(--text-muted);
}

/* Grade label */
.grade-label {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
}

.grade-label.excellent { background: var(--success-bg); color: var(--success); }
.grade-label.good { background: var(--info-bg); color: var(--info); }
.grade-label.average { background: var(--warning-bg); color: var(--warning); }
.grade-label.poor { background: var(--danger-bg); color: var(--danger); }
.grade-label.none { background: var(--bg-secondary); color: var(--text-muted); }

/* Comment text */
.comment-text {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-style: italic;
  line-height: 1.4;
}

/* Confirm Delete */
.confirm-message {
  text-align: center;
  padding: 12px 0;
}

.confirm-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.confirm-icon.danger {
  color: var(--danger);
}

.confirm-message p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 6px;
}

.confirm-sub {
  font-size: 0.78rem !important;
  color: var(--text-muted) !important;
  margin-top: 4px !important;
}

/* Empty state inside class */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  color: var(--text-muted);
  text-align: center;
}

.empty-state .material-symbols-rounded {
  font-size: 56px;
  margin-bottom: 12px;
  opacity: 0.5;
}

.empty-state h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.empty-state p {
  font-size: 0.82rem;
}

.empty-state-sm {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px;
  color: var(--text-muted);
  text-align: center;
  gap: 6px;
}

.empty-state-sm .material-symbols-rounded {
  font-size: 36px;
  opacity: 0.4;
}

.empty-state-sm p {
  font-size: 0.8rem;
}

/* Class selector group */
.class-selector-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.select-filter-lg {
  min-width: 260px;
  padding: 10px 16px;
  font-size: 0.88rem;
  font-weight: 500;
}

/* ---- Toast ---- */
.toast {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--card-shadow-lg);
  font-size: 0.84rem;
  color: var(--text-secondary);
  animation: toastIn 0.3s var(--ease-out);
  min-width: 220px;
}

.toast.success { border-left: 3px solid var(--success); }
.toast.success .material-symbols-rounded { color: var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.error .material-symbols-rounded { color: var(--danger); }
.toast.info { border-left: 3px solid var(--info); }
.toast.info .material-symbols-rounded { color: var(--info); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(30px); }
}

/* ---- Responsive ---- */
@media (max-width: 1100px) {
  .toolbar { flex-direction: column; align-items: stretch; gap: 10px; }
  .toolbar-left, .toolbar-right { width: 100%; }
  .toolbar-right { justify-content: flex-end; }
  .class-selector-group { flex-wrap: wrap; }
}

@media (max-width: 768px) {
  .form-row {
    flex-direction: column;
  }
  .exam-stats-row {
    flex-wrap: wrap;
  }
  .exam-stat-card {
    min-width: calc(50% - 8px);
  }
  .exam-card-actions {
    opacity: 1;
  }
  .detail-modal-actions {
    flex-wrap: wrap;
  }
  .score-entry {
    flex-wrap: wrap;
  }
  .score-entry input[type="text"] {
    flex: none;
    width: 100%;
  }

  /* Toolbar: selector full width, button icon-only */
  .class-selector-group { flex-wrap: wrap; width: 100%; }
  .select-filter-lg { min-width: auto; width: 100%; }
  #course-selector { width: 100%; }
  .toolbar-right .btn-primary span:not(.material-symbols-rounded) {
    display: none;
  }
  .toolbar-right .btn-primary {
    padding: 8px 10px;
  }

  /* Exam card stats wrap */
  .exam-card-stats { flex-wrap: wrap; gap: 6px; }
  .exam-stat-chip { font-size: 0.7rem; padding: 3px 8px; }

  /* Modal full-width on mobile */
  .modal-lg { width: 95vw; }
  .score-entry-labels { display: none; }
}