/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast),
    color var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

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

.btn-primary {
  background: var(--accent-primary);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: #2563EB; }
.btn-primary:active:not(:disabled) { background: #1D4ED8; }

.btn-secondary {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-primary);
}
.btn-secondary:hover:not(:disabled) { background: var(--border-color); }
.btn-secondary:active:not(:disabled) { background: var(--border-light); }

.btn-danger {
  background: var(--accent-danger);
  color: #fff;
}
.btn-danger:hover:not(:disabled) { background: #DC2626; }
.btn-danger:active:not(:disabled) { background: #B91C1C; }

.btn-ghost {
  color: var(--text-secondary);
}
.btn-ghost:hover:not(:disabled) { background: var(--bg-tertiary); color: var(--text-primary); }
.btn-ghost:active:not(:disabled) { background: var(--border-color); }

.btn-sm { padding: 4px 10px; font-size: var(--text-xs); }
.btn-lg { padding: 12px 24px; font-size: var(--text-base); }
.btn-icon { padding: 8px; width: 36px; height: 36px; }
.btn-icon.btn-sm { width: 28px; height: 28px; padding: 4px; }
.btn-block { width: 100%; }

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  line-height: 1.4;
}
.badge-primary { background: rgba(59,130,246,0.15); color: var(--accent-primary); }
.badge-success { background: rgba(16,185,129,0.15); color: var(--accent-success); }
.badge-warning { background: rgba(245,158,11,0.15); color: var(--accent-warning); }
.badge-danger { background: rgba(239,68,68,0.15); color: var(--accent-danger); }
.badge-info { background: rgba(6,182,212,0.15); color: var(--accent-info); }
.badge-purple { background: rgba(139,92,246,0.15); color: var(--accent-purple); }

/* Alert */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border-left: 4px solid;
  font-size: var(--text-sm);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.alert-info { background: rgba(6,182,212,0.08); border-color: var(--accent-info); color: var(--accent-info); }
.alert-success { background: rgba(16,185,129,0.08); border-color: var(--accent-success); color: var(--accent-success); }
.alert-warning { background: rgba(245,158,11,0.08); border-color: var(--accent-warning); color: var(--accent-warning); }
.alert-danger { background: rgba(239,68,68,0.08); border-color: var(--accent-danger); color: var(--accent-danger); }

/* Card */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-body { padding: 20px; }
.card-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-color);
}

/* Tabs */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  gap: 0;
}
.tab {
  padding: 10px 20px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  margin-bottom: -1px;
}
.tab:hover { color: var(--text-primary); }
.tab.active { color: var(--accent-primary); border-bottom-color: var(--accent-primary); }

/* Dropdown */
.dropdown { position: relative; display: inline-block; }
.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  padding: 4px;
}
.dropdown.open .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.dropdown-item:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.dropdown-divider { height: 1px; background: var(--border-color); margin: 4px 0; }

/* Spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.spinner-sm { width: 16px; height: 16px; border-width: 2px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Tooltip */
.tooltip {
  position: relative;
}
.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 4px 10px;
  font-size: var(--text-xs);
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: var(--z-tooltip);
}
.tooltip:hover::after { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  color: var(--text-muted);
}
.breadcrumb-item { color: var(--text-secondary); transition: color var(--transition-fast); }
.breadcrumb-item:hover { color: var(--text-primary); }
.breadcrumb-item.active { color: var(--text-primary); pointer-events: none; }
.breadcrumb-separator { color: var(--text-muted); }

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  gap: 4px;
}
.page-btn {
  min-width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.page-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.page-btn.active { background: var(--accent-primary); color: #fff; }
.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Avatar */
.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar-sm { width: 28px; height: 28px; font-size: var(--text-xs); }
.avatar-lg { width: 48px; height: 48px; font-size: var(--text-lg); }

.online-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-success);
  border: 2px solid var(--bg-secondary);
  position: absolute;
  bottom: 0;
  right: 0;
}

/* Status indicator */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.status-dot-active { background: var(--accent-success); }
.status-dot-pending { background: var(--accent-warning); }
.status-dot-closed { background: var(--text-muted); }
.status-dot-critical { background: var(--accent-danger); }

/* Notification badge */
.notification-badge {
  position: relative;
}
.notification-badge::after {
  content: attr(data-count);
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  font-size: 10px;
  font-weight: 700;
  color: #fff;
  background: var(--accent-danger);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}