/* 
 * Student Portal - Reusable Components
 * Cards, Buttons, Forms, Tables, Modals, etc.
 */

/* ========================================
   CARDS
   ======================================== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  overflow: hidden;
  max-width: 100%;
}

.card-header {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border);
  background: var(--bg-page);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* Metric Cards */
.metric-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  overflow: hidden;
  max-width: 100%;
}

.metric-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.metric-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.metric-icon svg {
  width: 24px;
  height: 24px;
}

.metric-icon.primary {
  background: var(--primary-light);
  color: var(--primary);
}

.metric-icon.success {
  background: var(--success-light);
  color: var(--success);
}

.metric-icon.warning {
  background: var(--warning-light);
  color: var(--warning);
}

.metric-icon.danger {
  background: var(--danger-light);
  color: var(--danger);
}

.metric-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.metric-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.metric-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
}

.metric-change {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.metric-change.positive {
  background: var(--success-light);
  color: var(--success);
}

.metric-change.negative {
  background: var(--danger-light);
  color: var(--danger);
}

.metric-change svg {
  width: 14px;
  height: 14px;
}

.metric-sparkline {
  width: 80px;
  height: 32px;
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-page);
  border-color: var(--border-dark);
}

.btn-success {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.btn-success:hover:not(:disabled) {
  background: #059669;
  border-color: #059669;
}

.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
  border-color: #dc2626;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-page);
  color: var(--text-primary);
}

.btn-link {
  background: transparent;
  color: var(--primary);
  border-color: transparent;
  padding: 0;
}

.btn-link:hover:not(:disabled) {
  color: var(--primary-hover);
  text-decoration: underline;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 12px 20px;
  font-size: 1rem;
}

.btn-icon {
  padding: var(--spacing-sm);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
}

/* Button Group */
.btn-group {
  display: inline-flex;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.btn-group .btn:last-child {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.btn-group .btn:not(:last-child) {
  border-right: none;
}

/* ========================================
   BADGES
   ======================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-full);
}

.badge-primary {
  background: var(--primary-light);
  color: var(--primary);
}

.badge-success {
  background: var(--success-light);
  color: var(--success);
}

.badge-danger {
  background: var(--danger-light);
  color: var(--danger);
}

.badge-warning {
  background: var(--warning-light);
  color: #92400e;
}

.badge-info {
  background: var(--info-light);
  color: var(--info);
}

.badge-neutral {
  background: var(--bg-page);
  color: var(--text-secondary);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ========================================
   FORMS
   ======================================== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-label.required::after {
  content: '*';
  color: var(--danger);
  margin-left: 4px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.875rem;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background: var(--bg-page);
  color: var(--text-secondary);
  cursor: not-allowed;
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--danger);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
  box-shadow: 0 0 0 3px var(--danger-light);
}

.form-helper {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

.form-error {
  font-size: 0.75rem;
  color: var(--danger);
  margin-top: var(--spacing-xs);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.form-check-label {
  font-size: 0.875rem;
  color: var(--text-primary);
  user-select: none;
}

/* Toggle Switch */
.toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}

.toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  width: 44px;
  height: 24px;
  background: var(--border-dark);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
  position: relative;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.toggle input:checked + .toggle-slider {
  background: var(--primary);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

.toggle input:focus + .toggle-slider {
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Input with Icon */
.input-icon {
  position: relative;
}

.input-icon .form-input {
  padding-left: 40px;
}

.input-icon svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

/* ========================================
   TABLES
   ======================================== */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.table th {
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  background: var(--bg-page);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}

.table tr:last-child td {
  border-bottom: none;
}

.table tbody tr {
  transition: background var(--transition-fast);
}

.table tbody tr:hover {
  background: var(--bg-page);
}

.table-striped tbody tr:nth-child(even) {
  background: rgba(249, 250, 251, 0.5);
}

.table-striped tbody tr:nth-child(even):hover {
  background: var(--bg-page);
}

/* Responsive Table */
@media (max-width: 768px) {
  .table-responsive {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ========================================
   MODALS
   ======================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: var(--spacing-md);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-lg {
  max-width: 700px;
}

.modal-xl {
  max-width: 900px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.modal-title {
  font-size: 1.125rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  padding: var(--spacing-xs);
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-page);
  color: var(--text-primary);
}

.modal-close svg {
  width: 20px;
  height: 20px;
}

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

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border);
  background: var(--bg-page);
}

/* ========================================
   DROPDOWNS
   ======================================== */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1500;
  padding: var(--spacing-xs) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
}

.dropdown-menu.right {
  left: auto;
  right: 0;
}

.dropdown.active .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-page);
}

.dropdown-item svg {
  width: 18px;
  height: 18px;
  color: var(--text-secondary);
}

.dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: var(--spacing-xs) 0;
}

/* ========================================
   TABS
   ======================================== */
.tabs {
  display: flex;
  gap: var(--spacing-xs);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--spacing-lg);
}

.tab {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
  transition: color var(--transition-fast);
}

.tab:hover {
  color: var(--text-primary);
}

.tab.active {
  color: var(--primary);
}

.tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px 2px 0 0;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Pills Tabs */
.tabs-pills {
  border-bottom: none;
  background: var(--bg-page);
  padding: var(--spacing-xs);
  border-radius: var(--radius-md);
  width: fit-content;
}

.tabs-pills .tab {
  border-radius: var(--radius-sm);
}

.tabs-pills .tab.active {
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.tabs-pills .tab.active::after {
  display: none;
}

/* ========================================
   ALERTS
   ======================================== */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
}

.alert svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

.alert-info {
  background: var(--info-light);
  color: var(--info);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.alert-success {
  background: var(--success-light);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-warning {
  background: var(--warning-light);
  color: #92400e;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.alert-danger {
  background: var(--danger-light);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: 600;
  margin-bottom: 2px;
}

.alert-dismiss {
  background: none;
  border: none;
  padding: 2px;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.alert-dismiss:hover {
  opacity: 1;
}

/* ========================================
   PROGRESS
   ======================================== */
.progress {
  height: 8px;
  background: var(--bg-page);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.progress-bar.success { background: var(--success); }
.progress-bar.warning { background: var(--warning); }
.progress-bar.danger { background: var(--danger); }

/* ========================================
   TOOLTIPS
   ======================================== */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::before,
[data-tooltip]::after {
  position: absolute;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 1600;
}

[data-tooltip]::before {
  content: attr(data-tooltip);
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 10px;
  background: var(--bg-sidebar);
  color: white;
  font-size: 0.75rem;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
}

[data-tooltip]::after {
  content: '';
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--bg-sidebar);
  margin-bottom: -4px;
}

[data-tooltip]:hover::before,
[data-tooltip]:hover::after {
  opacity: 1;
}

/* ========================================
   AVATAR
   ======================================== */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
  overflow: hidden;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-sm {
  width: 32px;
  height: 32px;
  font-size: 0.75rem;
}

.avatar-lg {
  width: 56px;
  height: 56px;
  font-size: 1.125rem;
}

.avatar-xl {
  width: 80px;
  height: 80px;
  font-size: 1.5rem;
}

/* Avatar Group */
.avatar-group {
  display: flex;
}

.avatar-group .avatar {
  border: 2px solid var(--bg-card);
  margin-left: -8px;
}

.avatar-group .avatar:first-child {
  margin-left: 0;
}

/* ========================================
   CHARTS
   ======================================== */
.chart-container {
  position: relative;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
}

.chart-container canvas {
  max-width: 100% !important;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  justify-content: center;
}

.chart-legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.chart-legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

/* ========================================
   EMPTY STATE
   ======================================== */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  color: var(--text-secondary);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.empty-state-text {
  font-size: 0.875rem;
  margin-bottom: var(--spacing-lg);
}

/* ========================================
   LOADING STATES
   ======================================== */
.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.skeleton {
  background: linear-gradient(90deg, var(--bg-page) 25%, #e8e9ec 50%, var(--bg-page) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 16px;
  margin-bottom: var(--spacing-sm);
}

.skeleton-title {
  height: 24px;
  width: 60%;
  margin-bottom: var(--spacing-md);
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

/* ========================================
   PAGE GRIDS
   ======================================== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  width: 100%;
  max-width: 100%;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  width: 100%;
  max-width: 100%;
}

.charts-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  width: 100%;
  max-width: 100%;
}

@media (max-width: 1400px) {
  .metrics-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
  }
}

@media (max-width: 1200px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
  
  .charts-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }
  
  .charts-grid {
    gap: var(--spacing-md);
  }
  
  .charts-grid-3 {
    grid-template-columns: 1fr;
  }
  
  .metric-card {
    padding: var(--spacing-md);
  }
  
  .metric-value {
    font-size: 1.5rem;
  }
  
  .metric-icon {
    width: 40px;
    height: 40px;
  }
  
  .metric-icon svg {
    width: 20px;
    height: 20px;
  }
}

@media (max-width: 640px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  
  .charts-grid-3 {
    grid-template-columns: 1fr;
  }
  
  .metric-card {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .metric-value {
    font-size: 1.25rem;
  }
  
  .metric-label {
    font-size: 0.75rem;
  }
  
  .metric-sparkline {
    width: 60px;
    height: 24px;
  }
}

/* ========================================
   SECTION HEADERS
   ======================================== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.section-title {
  font-size: 1.125rem;
  font-weight: 600;
}

.section-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ========================================
   AI ASSISTANT FLOATING BUTTON & PANEL
   ======================================== */
.ai-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  z-index: 1800;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.ai-fab:hover {
  background: var(--primary-hover);
  transform: scale(1.05);
}

.ai-fab svg {
  width: 28px;
  height: 28px;
}

.ai-panel {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  max-width: 100%;
  height: 100vh;
  background: var(--bg-card);
  box-shadow: var(--shadow-xl);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  transition: right var(--transition-normal);
}

.ai-panel.active {
  right: 0;
}

.ai-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.ai-panel-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
}

.ai-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.ai-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.ai-suggestion {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ai-suggestion:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.ai-messages {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.ai-message {
  display: flex;
  gap: var(--spacing-sm);
  max-width: 90%;
}

.ai-message.user {
  flex-direction: row-reverse;
  margin-left: auto;
}

.ai-message-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.75rem;
}

.ai-message.user .ai-message-avatar {
  background: var(--text-secondary);
}

.ai-message-content {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-page);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  line-height: 1.5;
}

.ai-message.user .ai-message-content {
  background: var(--primary);
  color: white;
}

.ai-typing {
  display: flex;
  gap: 4px;
  padding: var(--spacing-sm);
}

.ai-typing span {
  width: 8px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typing 1.4s infinite ease-in-out;
}

.ai-typing span:nth-child(2) { animation-delay: 0.2s; }
.ai-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-8px); }
}

.ai-panel-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border);
}

.ai-input-wrapper {
  display: flex;
  gap: var(--spacing-sm);
}

.ai-input-wrapper input {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
}

.ai-input-wrapper input:focus {
  outline: none;
  border-color: var(--primary);
}

.ai-panel-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1900;
}

.ai-panel-overlay.active {
  display: block;
}

@media (max-width: 480px) {
  .ai-panel {
    width: 100%;
  }
  
  .ai-fab {
    bottom: 16px;
    right: 16px;
    width: 48px;
    height: 48px;
  }
}

/* ========================================
   TIMETABLE SPECIFIC
   ======================================== */
.timetable {
  display: grid;
  grid-template-columns: 80px repeat(6, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.timetable-header {
  background: var(--bg-page);
  padding: var(--spacing-sm);
  font-weight: 600;
  font-size: 0.75rem;
  text-align: center;
  text-transform: uppercase;
}

.timetable-time {
  background: var(--bg-page);
  padding: var(--spacing-sm);
  font-size: 0.75rem;
  text-align: center;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.timetable-cell {
  background: var(--bg-card);
  min-height: 80px;
  padding: var(--spacing-xs);
}

.timetable-class {
  background: var(--primary-light);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  height: 100%;
}

.timetable-class:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.timetable-class-name {
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 2px;
}

.timetable-class-info {
  color: var(--text-secondary);
  font-size: 0.6875rem;
}

.timetable-class.lab {
  background: var(--success-light);
  border-left-color: var(--success);
}

.timetable-class.lab .timetable-class-name {
  color: var(--success);
}

@media (max-width: 768px) {
  .timetable {
    grid-template-columns: 60px repeat(6, minmax(100px, 1fr));
    overflow-x: auto;
  }
}

/* ========================================
   COUNTDOWN / STATUS
   ======================================== */
.countdown {
  display: flex;
  gap: var(--spacing-sm);
}

.countdown-item {
  text-align: center;
  background: var(--bg-page);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  min-width: 50px;
}

.countdown-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.countdown-label {
  font-size: 0.625rem;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* Status Indicator */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.status-dot.online { background: var(--success); }
.status-dot.offline { background: var(--text-muted); }
.status-dot.busy { background: var(--danger); }
.status-dot.away { background: var(--warning); }

/* ========================================
   ADDITIONAL RESPONSIVE STYLES
   ======================================== */
@media (max-width: 768px) {
  .card-header {
    flex-wrap: wrap;
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .card-header > div:first-child {
    flex: 1 1 100%;
  }
  
  .card-body {
    padding: var(--spacing-md);
  }
  
  .card-title {
    font-size: 0.9rem;
  }
  
  .chart-container {
    min-height: 200px;
  }
  
  .table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .table {
    min-width: 600px;
  }
  
  .badge {
    font-size: 0.65rem;
    padding: 2px 6px;
  }
  
  .btn {
    padding: 6px 12px;
    font-size: 0.8125rem;
  }
  
  .btn-sm {
    padding: 4px 8px;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .card-body {
    padding: var(--spacing-sm);
  }
  
  .chart-container {
    min-height: 180px;
    height: 200px !important;
  }
  
  .alert {
    flex-direction: column;
    text-align: center;
    padding: var(--spacing-md);
  }
  
  .alert svg {
    margin-bottom: var(--spacing-sm);
  }
  
  .form-group {
    margin-bottom: var(--spacing-sm);
  }
  
  .form-select,
  .form-input,
  .form-textarea {
    font-size: 16px; /* Prevent zoom on iOS */
  }
}

/* Flex wrap utilities for responsive */
@media (max-width: 640px) {
  .flex-wrap-mobile {
    flex-wrap: wrap;
  }
  
  .full-width-mobile {
    width: 100%;
  }
}