/* ==========================================================================
   Reusable Components - Buttons, Cards, Forms, Tables, Modals
   ========================================================================== */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-family: var(--font-family);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--tz-green) 0%, var(--tz-blue) 100%);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.05);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-light);
}

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

.btn-danger:hover {
  filter: brightness(1.1);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-icon:hover {
  background: var(--border-light);
}

/* --- Cards --- */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  animation: slideUp 0.5s ease forwards;
}

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

.card-body {
  padding: 1.25rem;
}

.stat-card {
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  border-radius: 4px 0 0 4px;
}

.stat-card--students::before { background: var(--tz-blue); }
.stat-card--courses::before { background: var(--tz-green); }
.stat-card--attendance::before { background: var(--tz-gold); }
.stat-card--pass::before { background: var(--tz-blue-dark); }

.stat-card__value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-card__label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.stat-card__icon {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  opacity: 0.15;
}

/* --- Forms --- */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-family);
  font-size: 0.9375rem;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--tz-blue);
  box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.2);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
}

/* --- Tables --- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

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

.data-table th,
.data-table td {
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.data-table th {
  background: var(--bg-body);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

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

.data-table tbody tr:hover {
  background: var(--border-light);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
}

.badge--active { background: #e8f5e9; color: var(--tz-green-dark); }
.badge--inactive { background: #f5f5f5; color: var(--text-muted); }
.badge--graduated { background: #e3f2fd; color: var(--tz-blue-dark); }
.badge--suspended { background: #ffebee; color: var(--color-danger); }

[data-theme="dark"] .badge--active { background: rgba(46, 125, 50, 0.3); }
[data-theme="dark"] .badge--inactive { background: rgba(128, 134, 139, 0.2); }
[data-theme="dark"] .badge--graduated { background: rgba(30, 136, 229, 0.3); }
[data-theme="dark"] .badge--suspended { background: rgba(211, 47, 47, 0.3); }

/* --- Modals --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  padding: 1rem;
}

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

.modal {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(10px);
  transition: var(--transition);
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.modal-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 0.25rem;
}

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

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-light);
}

/* --- Alerts & Toast --- */
.alert {
  padding: 0.875rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  animation: fadeIn 0.3s ease;
}

.alert--error {
  background: #ffebee;
  color: #c62828;
  border: 1px solid #ef9a9a;
}

.alert--success {
  background: #e8f5e9;
  color: #2e7d32;
  border: 1px solid #a5d6a7;
}

[data-theme="dark"] .alert--error {
  background: rgba(211, 47, 47, 0.2);
  border-color: rgba(211, 47, 47, 0.4);
}

[data-theme="dark"] .alert--success {
  background: rgba(46, 125, 50, 0.2);
  border-color: rgba(46, 125, 50, 0.4);
}

/* --- Loading Spinner --- */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--tz-green);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

[data-theme="dark"] .spinner-overlay {
  background: rgba(18, 18, 18, 0.9);
}

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

/* --- Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
}

.pagination__info {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.pagination__buttons {
  display: flex;
  gap: 0.5rem;
}

.pagination__btn {
  min-width: 36px;
  height: 36px;
  padding: 0 0.5rem;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.875rem;
  transition: var(--transition);
}

.pagination__btn:hover:not(:disabled) {
  background: var(--tz-green);
  color: white;
  border-color: var(--tz-green);
}

.pagination__btn.active {
  background: var(--tz-green);
  color: white;
  border-color: var(--tz-green);
}

.pagination__btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.animate-slide-up {
  animation: slideUp 0.5s ease forwards;
}