/* ============================================
   EduFace AI — Components
   Cards, Tables, Badges, Modals, Toast, Buttons
   ============================================ */

/* --- Glass Card --- */
.card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.card-no-hover:hover { transform: none; box-shadow: none; }

/* --- Stat Card --- */
.stat-card {
  background: var(--bg-glass); backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass); border-radius: var(--radius-lg);
  padding: var(--space-lg); position: relative; overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.stat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.stat-card.success::before { background: var(--gradient-success); }
.stat-card.warning::before { background: var(--gradient-warning); }
.stat-card.danger::before { background: var(--gradient-danger); }
.stat-card.info::before { background: var(--gradient-info); }
.stat-card.teal::before { background: var(--gradient-teal); }
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.stat-card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-md); }
.stat-card-icon {
  width: 42px; height: 42px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem;
}
.stat-card.success .stat-card-icon { background: var(--success-bg); color: var(--success); }
.stat-card.warning .stat-card-icon { background: var(--warning-bg); color: var(--warning); }
.stat-card.danger .stat-card-icon { background: var(--danger-bg); color: var(--danger); }
.stat-card.info .stat-card-icon { background: var(--info-bg); color: var(--info); }
.stat-card.teal .stat-card-icon { background: rgba(6,182,212,0.15); color: var(--accent-teal); }
.stat-card-trend { font-size: var(--font-size-xs); padding: 2px 8px; border-radius: var(--radius-full); font-weight: var(--font-weight-medium); }
.stat-card-trend.up { background: var(--success-bg); color: var(--success); }
.stat-card-trend.down { background: var(--danger-bg); color: var(--danger); }
.stat-card-value { font-size: var(--font-size-3xl); font-weight: var(--font-weight-bold); line-height: 1.1; margin-bottom: var(--space-xs); }
.stat-card-label { font-size: var(--font-size-sm); color: var(--text-secondary); }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-sm);
  padding: 0.5rem 1.125rem; border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium); font-size: var(--font-size-sm);
  transition: all var(--transition-fast); white-space: nowrap; cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: var(--gradient-teal); color: white; border: none; }
.btn-primary:hover { box-shadow: var(--shadow-glow-teal); transform: translateY(-1px); }
.btn-secondary { background: var(--bg-glass); color: var(--text-primary); border: 1px solid var(--border-glass); }
.btn-secondary:hover { background: var(--bg-glass-hover); }
.btn-danger { background: var(--gradient-danger); color: white; }
.btn-danger:hover { box-shadow: 0 0 20px rgba(239,68,68,0.3); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { color: var(--text-primary); background: rgba(148,163,184,0.08); }
.btn-sm { padding: 0.375rem 0.75rem; font-size: var(--font-size-xs); }
.btn-lg { padding: 0.75rem 1.5rem; font-size: var(--font-size-base); }
.btn-icon { width: 36px; height: 36px; padding: 0; border-radius: var(--radius-md); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* --- Badge --- */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: var(--radius-full);
  font-size: var(--font-size-xs); font-weight: var(--font-weight-semibold);
}
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-teal { background: rgba(6,182,212,0.15); color: var(--accent-teal); }
.badge-muted { background: rgba(100,116,139,0.2); color: var(--text-muted); }
.badge-dot::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* --- Data Table --- */
.data-table-wrapper {
  background: var(--bg-glass); backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass); border-radius: var(--radius-lg); overflow: hidden;
}
.data-table-toolbar {
  padding: var(--space-lg); display: flex; align-items: center;
  justify-content: space-between; gap: var(--space-md); flex-wrap: wrap;
  border-bottom: 1px solid var(--border-glass);
}
.data-table-toolbar-left, .data-table-toolbar-right { display: flex; align-items: center; gap: var(--space-sm); flex-wrap: wrap; }
.data-table { width: 100%; border-collapse: collapse; }
.data-table thead th {
  padding: 0.5rem 0.75rem; text-align: left; font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold); color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-glass); background: rgba(241,245,249,0.8);
  cursor: pointer; user-select: none;
}
.data-table thead th:hover { color: var(--text-secondary); }
.data-table tbody tr { border-bottom: 1px solid var(--border-subtle); transition: background var(--transition-fast); }
.data-table tbody tr:hover { background: rgba(148,163,184,0.05); }
.data-table tbody tr:last-child { border-bottom: none; }
.data-table tbody td { padding: 0.5rem 0.75rem; font-size: var(--font-size-sm); color: var(--text-secondary); }
.data-table-footer {
  padding: var(--space-md) var(--space-lg); display: flex; align-items: center;
  justify-content: space-between; border-top: 1px solid var(--border-glass);
  font-size: var(--font-size-sm); color: var(--text-muted); flex-wrap: wrap; gap: var(--space-sm);
}
.pagination { display: flex; align-items: center; gap: 4px; }
.pagination-btn {
  width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); font-size: var(--font-size-sm); color: var(--text-secondary);
  background: transparent; border: 1px solid transparent; cursor: pointer; transition: all var(--transition-fast);
}
.pagination-btn:hover { background: rgba(148,163,184,0.1); color: var(--text-primary); }
.pagination-btn.active { background: var(--accent-teal); color: white; }
.pagination-btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* --- Modal --- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px);
  z-index: var(--z-modal); display: flex; align-items: center; justify-content: center;
  padding: var(--space-lg); opacity: 0; visibility: hidden; transition: all var(--transition-base);
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal {
  background: var(--bg-secondary); border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl); width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto;
  transform: translateY(20px) scale(0.95); transition: transform var(--transition-base);
}
.modal-overlay.active .modal { transform: translateY(0) scale(1); }
.modal-header {
  padding: var(--space-lg) var(--space-xl); border-bottom: 1px solid var(--border-glass);
  display: flex; align-items: center; justify-content: space-between;
}
.modal-header h3 { font-size: var(--font-size-lg); }
.modal-close {
  width: 32px; height: 32px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); cursor: pointer; transition: all var(--transition-fast);
}
.modal-close:hover { background: rgba(148,163,184,0.1); color: var(--text-primary); }
.modal-body { padding: var(--space-xl); }
.modal-footer {
  padding: var(--space-lg) var(--space-xl); border-top: 1px solid var(--border-glass);
  display: flex; align-items: center; justify-content: flex-end; gap: var(--space-sm);
}

/* --- Form --- */
.form-group { margin-bottom: var(--space-lg); }
.form-label { display: block; font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); color: var(--text-secondary); margin-bottom: var(--space-sm); }
.form-input { width: 100%; }
.form-error { font-size: var(--font-size-xs); color: var(--danger); margin-top: var(--space-xs); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }

/* --- Toast --- */
.toast-container {
  position: fixed; top: calc(var(--topbar-height) + var(--space-md)); right: var(--space-lg);
  z-index: var(--z-toast); display: flex; flex-direction: column; gap: var(--space-sm); pointer-events: none;
}
.toast {
  background: var(--bg-secondary); border: 1px solid var(--border-glass); border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg); display: flex; align-items: center; gap: var(--space-md);
  min-width: 300px; max-width: 420px; box-shadow: var(--shadow-lg);
  animation: slideInRight 0.3s ease forwards; pointer-events: auto; position: relative; overflow: hidden;
}
.toast.toast-exit { animation: slideOutRight 0.3s ease forwards; }
@keyframes slideOutRight { to { opacity: 0; transform: translateX(100px); } }
.toast-icon {
  width: 28px; height: 28px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center; font-size: 0.875rem; flex-shrink: 0;
}
.toast.success .toast-icon { background: var(--success-bg); color: var(--success); }
.toast.error .toast-icon { background: var(--danger-bg); color: var(--danger); }
.toast.info .toast-icon { background: var(--info-bg); color: var(--info); }
.toast-content { flex: 1; }
.toast-title { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); }
.toast-message { font-size: var(--font-size-xs); color: var(--text-secondary); margin-top: 2px; }
.toast-close { color: var(--text-muted); cursor: pointer; padding: 4px; }
.toast-progress { position: absolute; bottom: 0; left: 0; height: 2px; border-radius: 0 0 var(--radius-md) var(--radius-md); animation: toastProgress 3s linear forwards; }
.toast.success .toast-progress { background: var(--success); }
.toast.error .toast-progress { background: var(--danger); }
@keyframes toastProgress { from { width: 100%; } to { width: 0%; } }

/* --- Tabs --- */
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--border-glass); margin-bottom: var(--space-xl); overflow-x: auto; }
.tab-btn {
  padding: 0.75rem 1.25rem; font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--text-muted); border: none; border-bottom: 2px solid transparent;
  cursor: pointer; white-space: nowrap; background: none; transition: all var(--transition-fast);
}
.tab-btn:hover { color: var(--text-secondary); }
.tab-btn.active { color: var(--accent-teal); border-bottom-color: var(--accent-teal); }
.tab-content { display: none; animation: fadeIn 0.3s ease; }
.tab-content.active { display: block; }

/* --- Misc --- */
.spinner { width: 24px; height: 24px; border: 3px solid var(--border-glass); border-top-color: var(--accent-teal); border-radius: 50%; animation: spin 0.8s linear infinite; }
.spinner-lg { width: 40px; height: 40px; border-width: 4px; }
.avatar { width: 36px; height: 36px; border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; font-weight: var(--font-weight-semibold); font-size: var(--font-size-sm); color: white; flex-shrink: 0; overflow: hidden; }
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar-sm { width: 28px; height: 28px; }
.avatar-lg { width: 48px; height: 48px; }
.dropdown { position: relative; }
.dropdown-menu { position: absolute; top: calc(100% + 4px); right: 0; background: var(--bg-secondary); border: 1px solid var(--border-glass); border-radius: var(--radius-md); padding: var(--space-xs); min-width: 160px; box-shadow: var(--shadow-lg); z-index: var(--z-dropdown); opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all var(--transition-fast); }
.dropdown-menu.active { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-item { display: flex; align-items: center; gap: var(--space-sm); padding: 0.5rem 0.75rem; font-size: var(--font-size-sm); color: var(--text-secondary); border-radius: var(--radius-sm); cursor: pointer; transition: all var(--transition-fast); }
.dropdown-item:hover { background: rgba(148,163,184,0.08); color: var(--text-primary); }
.dropdown-item.danger { color: var(--danger); }
.progress-bar { width: 100%; height: 8px; background: var(--bg-tertiary); border-radius: var(--radius-full); overflow: hidden; }
.progress-bar-fill { height: 100%; border-radius: var(--radius-full); background: var(--gradient-teal); transition: width 0.5s ease; }
.filter-bar { display: flex; align-items: center; gap: var(--space-md); flex-wrap: wrap; padding: var(--space-lg); background: var(--bg-glass); border: 1px solid var(--border-glass); border-radius: var(--radius-lg); margin-bottom: var(--space-xl); }
.feed-item { display: flex; align-items: center; gap: var(--space-md); padding: var(--space-md); border-bottom: 1px solid var(--border-subtle); transition: background var(--transition-fast); }
.feed-item:hover { background: rgba(148,163,184,0.03); }
.feed-item:last-child { border-bottom: none; }
.feed-item-time { font-family: var(--font-mono); font-size: var(--font-size-xs); color: var(--text-muted); min-width: 52px; }
.feed-item-info { flex: 1; }
.feed-item-name { font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); }
.feed-item-class { font-size: var(--font-size-xs); color: var(--text-muted); }