/* ============================================================
   ALPHARIA — Teacher Dashboard CSS Extension
   Layers on top of student-dashboard-clean.css design tokens
   ============================================================ */

/* ── Teacher Stat Cards ── */
.td-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.td-stat-card {
  background: var(--sd-surface);
  border: 1.5px solid var(--sd-border);
  border-radius: var(--sd-radius);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: var(--sd-transition);
}
.td-stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sd-shadow);
}
.td-stat-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.td-stat-icon.indigo { background: rgba(79,70,229,.1); color: #4f46e5; }
.td-stat-icon.green  { background: rgba(16,185,129,.1); color: #10b981; }
.td-stat-icon.amber  { background: rgba(245,158,11,.1); color: #f59e0b; }
.td-stat-icon.teal   { background: rgba(20,184,166,.1); color: #14b8a6; }
.td-stat-icon.red    { background: rgba(239,68,68,.1);  color: #ef4444; }

.td-stat-info h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--sd-text);
  margin: 0;
  letter-spacing: -0.5px;
}
.td-stat-info p {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--sd-text-3);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: .04em;
}

/* ── Card ── */
.td-card {
  background: var(--sd-surface);
  border: 1.5px solid var(--sd-border);
  border-radius: var(--sd-radius);
  margin-bottom: 1.5rem;
  transition: var(--sd-transition);
}
.td-card:hover { box-shadow: var(--sd-shadow); }

.td-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1.5px solid var(--sd-border);
}
.td-card-header h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--sd-text);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.td-card-header h3 i { color: var(--sd-primary); font-size: 0.85rem; }

.td-card-body { padding: 1.25rem; }

/* ── Activity / Test Items ── */
.td-activity-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--sd-border);
}
.td-activity-item:last-child { border-bottom: none; }

.td-activity-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--sd-primary-lt);
  color: var(--sd-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.td-activity-info { flex: 1; min-width: 0; }
.td-activity-info h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--sd-text);
  margin: 0 0 0.1rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.td-activity-info p {
  font-size: 0.75rem;
  color: var(--sd-text-3);
  margin: 0;
}
.td-activity-actions { display: flex; gap: 0.5rem; flex-shrink: 0; }

/* ── Small Link Button ── */
.td-btn-sm {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  border-radius: 50px;
  border: 1.5px solid var(--sd-border);
  background: var(--sd-surface);
  color: var(--sd-text-2);
  cursor: pointer;
  transition: var(--sd-transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.td-btn-sm:hover {
  border-color: var(--sd-primary);
  color: var(--sd-primary);
  background: var(--sd-primary-lt);
}

/* ── Empty State ── */
.td-empty {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--sd-text-3);
}
.td-empty i { font-size: 2rem; margin-bottom: 0.75rem; display: block; }
.td-empty p { font-size: 0.85rem; margin: 0; }

/* ── Tables ── */
.td-table {
  width: 100%;
  border-collapse: collapse;
}
.td-table th {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--sd-text-3);
  text-transform: uppercase;
  letter-spacing: .04em;
  padding: 0.75rem 1rem;
  border-bottom: 1.5px solid var(--sd-border);
  background: var(--sd-surface-2);
  text-align: left;
}
.td-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--sd-border);
  font-size: 0.85rem;
  color: var(--sd-text);
  vertical-align: middle;
}
.td-table tbody tr:last-child td { border-bottom: none; }
.td-table tbody tr:hover { background: rgba(79,70,229,.02); }

.td-student-name {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.td-student-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  object-fit: cover;
}
.td-student-name-text { font-weight: 600; }

/* Status badges */
.td-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.td-badge-green  { background: rgba(16,185,129,.1); color: #10b981; }
.td-badge-amber  { background: rgba(245,158,11,.1); color: #f59e0b; }
.td-badge-red    { background: rgba(239,68,68,.1);  color: #ef4444; }

/* Progress bar */
.td-progress {
  width: 100%; height: 6px;
  background: var(--sd-border);
  border-radius: 50px;
  overflow: hidden;
}
.td-progress-fill {
  height: 100%;
  border-radius: 50px;
  background: linear-gradient(90deg, var(--sd-primary), #818cf8);
  transition: width 0.5s ease;
}

/* ── Chart containers ── */
.td-chart-wrap {
  position: relative;
  height: 300px;
  width: 100%;
}
.td-chart-wrap-sm {
  position: relative;
  height: 250px;
  width: 100%;
}

/* ── Grid layouts ── */
.td-grid-2 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
}

/* ── Settings ── */
.td-settings-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
}
.td-profile-card {
  text-align: center;
  padding: 2rem 1.5rem;
}
.td-profile-pic {
  width: 120px; height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--sd-border);
  margin-bottom: 1rem;
}
.td-profile-name {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--sd-text);
  margin-bottom: 0.2rem;
}
.td-profile-role {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--sd-text-3);
  text-transform: uppercase;
  letter-spacing: .04em;
}

/* Settings nav pills */
.td-settings-nav {
  margin-top: 1.5rem;
}
.td-settings-nav a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--sd-text-2);
  text-decoration: none;
  border-radius: var(--sd-radius-sm);
  transition: var(--sd-transition);
  margin-bottom: 0.2rem;
}
.td-settings-nav a:hover { background: var(--sd-primary-lt); color: var(--sd-primary); }
.td-settings-nav a.active { background: var(--sd-primary); color: white; }
.td-settings-nav a i { width: 18px; text-align: center; }

/* Form elements */
.td-form-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--sd-text-2);
  margin-bottom: 0.35rem;
  display: block;
}
.td-form-input {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1.5px solid var(--sd-border);
  border-radius: var(--sd-radius-sm);
  font-family: var(--sd-font);
  font-size: 0.85rem;
  color: var(--sd-text);
  background: var(--sd-surface);
  transition: var(--sd-transition);
}
.td-form-input:focus {
  outline: none;
  border-color: var(--sd-primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,.1);
}
.td-form-input:disabled {
  background: var(--sd-surface-2);
  color: var(--sd-text-3);
}
.td-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}
.td-form-group { margin-bottom: 1rem; }

/* Toggle switches */
.td-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--sd-border);
}
.td-toggle-row:last-child { border-bottom: none; }
.td-toggle-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--sd-text);
}
.td-toggle {
  position: relative;
  width: 44px; height: 24px;
}
.td-toggle input { opacity: 0; width: 0; height: 0; }
.td-toggle-slider {
  position: absolute; inset: 0;
  background: var(--sd-border);
  border-radius: 50px;
  cursor: pointer;
  transition: 0.25s;
}
.td-toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: white;
  left: 3px; top: 3px;
  transition: 0.25s;
  box-shadow: 0 1px 3px rgba(0,0,0,.15);
}
.td-toggle input:checked + .td-toggle-slider { background: var(--sd-primary); }
.td-toggle input:checked + .td-toggle-slider::before { transform: translateX(20px); }

/* ── Page Title ── */
.td-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.td-page-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--sd-text);
  letter-spacing: -0.5px;
}

/* Card footer with pagination */
.td-card-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1.5px solid var(--sd-border);
  display: flex;
  align-items: center;
  justify-content: center;
}
.td-pagination {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.td-page-btn {
  padding: 0.35rem 0.75rem;
  border: 1.5px solid var(--sd-border);
  border-radius: var(--sd-radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--sd-text-2);
  background: var(--sd-surface);
  cursor: pointer;
  transition: var(--sd-transition);
  text-decoration: none;
}
.td-page-btn:hover { border-color: var(--sd-primary); color: var(--sd-primary); }
.td-page-btn.active { background: var(--sd-primary); color: white; border-color: var(--sd-primary); }
.td-page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Search / Filter bar ── */
.td-filter-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.td-filter-select {
  padding: 0.45rem 0.85rem;
  border: 1.5px solid var(--sd-border);
  border-radius: var(--sd-radius-sm);
  font-family: var(--sd-font);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--sd-text-2);
  background: var(--sd-surface);
  cursor: pointer;
  transition: var(--sd-transition);
}
.td-filter-select:focus {
  outline: none;
  border-color: var(--sd-primary);
}

/* ── Chart Legend ── */
.td-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1rem;
}
.td-legend-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--sd-text-3);
}
.td-legend-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
}

/* ── Modal override ── */
.td-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.td-modal-overlay.show { display: flex; }
.td-modal {
  background: var(--sd-surface);
  border-radius: var(--sd-radius);
  max-width: 600px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--sd-shadow-md);
}
.td-modal-header {
  padding: 1.25rem;
  border-bottom: 1.5px solid var(--sd-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.td-modal-header h3 {
  font-size: 1rem;
  font-weight: 800;
  margin: 0;
  color: var(--sd-text);
}
.td-modal-body { padding: 1.25rem; }
.td-modal-footer {
  padding: 1rem 1.25rem;
  border-top: 1.5px solid var(--sd-border);
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .td-stat-grid { grid-template-columns: repeat(2, 1fr); }
  .td-grid-2 { grid-template-columns: 1fr; }
  .td-settings-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .td-stat-grid { grid-template-columns: 1fr; }
  .td-form-row { grid-template-columns: 1fr; }
  .td-card-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}