/* ============================================
   SIDEBAR STYLES
   ============================================ */

.sidebar {
  width: var(--size-sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
  transition: all var(--transition-normal);
}

/* Sidebar Header */
.sidebar-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.new-chat-btn {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all var(--transition-fast);
}

.new-chat-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.sidebar-toggle-mobile {
  display: none;
  width: 32px;
  height: 32px;
  border-radius: var(--border-radius-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
}

/* Sidebar Sections */
.sidebar-section {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.sidebar-section:last-of-type {
  border-bottom: none;
}

.section-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

/* Persona Selector */
.persona-selector {
  display: flex;
  gap: var(--space-sm);
}

.persona-btn {
  flex: 1;
  padding: var(--space-md) var(--space-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.persona-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--color-primary);
}

.persona-btn.active {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
  border-color: transparent;
}

.persona-btn span {
  font-weight: 500;
}

/* Select Dropdowns */
.persona-select {
  width: 100%;
}

/* Custom Persona Form */
.form-input,
.form-input:focus {
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group:last-child {
  margin-bottom: 0;
}

/* Conversation History */
.conversation-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-height: 400px;
  overflow-y: auto;
}

.conversation-item {
  padding: var(--space-md) var(--space-sm);
  border-radius: var(--border-radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-item:hover {
  background: var(--bg-tertiary);
}

.conversation-item.active {
  background: var(--color-primary);
  color: white;
}

.conversation-item-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-item-delete {
  opacity: 0;
  transition: opacity var(--transition-fast);
  width: 24px;
  height: 24px;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-secondary);
}

.conversation-item:hover .conversation-item-delete {
  opacity: 1;
}

.conversation-item-delete:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-error);
}

/* Empty State */
.empty-state {
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Quick Actions */
.quick-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.quick-action-btn {
  padding: var(--space-md);
  border-radius: var(--border-radius-md);
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all var(--transition-fast);
}

.quick-action-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.quick-action-btn span {
  font-weight: 500;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--border-radius-md);
  background: var(--bg-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-info:hover {
  background: var(--bg-tertiary);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.user-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.user-status {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ============================================
   RESPONSIVE SIDEBAR
   ============================================ */

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100%;
    z-index: 500;
    transform: translateX(-100%);
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.2);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-toggle-mobile {
    display: flex;
  }

  .main-layout {
    position: relative;
  }
}

@media (max-width: 640px) {
  .sidebar {
    --size-sidebar-width: 280px;
  }

  .sidebar-section {
    padding: var(--space-md);
  }
}