/* ============================================
   Sidebar Component
   ============================================ */

.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--glass-blur-strong));
  -webkit-backdrop-filter: blur(var(--glass-blur-strong));
  border-right: 1px solid var(--glass-border);
  z-index: 50;
  transition: transform var(--transition-normal), width var(--transition-normal);
  overflow: hidden;
  flex-shrink: 0;
}

/* --- Header --- */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--glass-border-light);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.sidebar-logo-img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  object-fit: cover;
  box-shadow: var(--shadow-glow-primary);
}

.sidebar-logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.sidebar-toggle-btn {
  display: flex;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: all var(--transition-normal);
}

.sidebar-toggle-btn:hover {
  background: var(--glass-bg);
  color: var(--color-primary);
}

.sidebar-toggle-btn svg,
.sidebar-toggle-btn i {
  transition: transform var(--transition-normal);
}

.sidebar.collapsed .sidebar-toggle-btn svg,
.sidebar.collapsed .sidebar-toggle-btn i {
  transform: rotate(180deg);
}

.sidebar-close-btn {
  display: none;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.sidebar-close-btn:hover {
  background: var(--glass-bg);
  color: var(--color-text);
}

/* --- New Chat Button --- */
.new-chat-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-4) var(--space-4) var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px dashed var(--glass-border);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.new-chat-btn:hover {
  background: var(--glass-bg-strong);
  border-style: solid;
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.new-chat-btn i {
  width: 18px;
  height: 18px;
}

/* --- Sections --- */
.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2) var(--space-3);
}

.sidebar-section {
  margin-bottom: var(--space-4);
}

.sidebar-section-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-light);
}

.sidebar-section-label i {
  width: 14px;
  height: 14px;
}

/* --- Chat Items --- */
.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  margin-bottom: 2px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  position: relative;
  overflow: hidden;
}

.sidebar-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
  border-radius: 0 3px 3px 0;
  transition: height var(--transition-normal);
}

.sidebar-item:hover {
  background: var(--glass-bg);
  color: var(--color-text);
}

.sidebar-item:hover::before {
  height: 60%;
}

.sidebar-item.active {
  background: var(--glass-bg-strong);
  color: var(--color-text);
  font-weight: 500;
}

.sidebar-item.active::before {
  height: 60%;
}

.sidebar-item-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  opacity: 0.7;
}

.sidebar-item.active .sidebar-item-icon {
  opacity: 1;
}

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

.sidebar-item-badge {
  padding: 2px 8px;
  font-size: 0.65rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(108, 99, 255, 0.12);
  color: var(--color-primary);
}

/* --- Footer --- */
.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--glass-border-light);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.sidebar-footer-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-footer-item:hover {
  background: var(--glass-bg);
  color: var(--color-text);
}

.sidebar-footer-item i {
  width: 18px;
  height: 18px;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dark-mode-toggle:hover {
  background: var(--glass-bg);
  color: var(--color-text);
}

.toggle-switch {
  width: 40px;
  height: 22px;
  border-radius: 12px;
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  position: relative;
  cursor: pointer;
  transition: all var(--transition-normal);
  margin-left: auto;
}

.toggle-switch::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-text-secondary);
  top: 2px;
  left: 2px;
  transition: all var(--transition-normal);
}

.toggle-switch.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-color: transparent;
}

.toggle-switch.active::after {
  left: 20px;
  background: white;
}

/* --- Sidebar Overlay (Mobile) --- */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  z-index: 40;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.sidebar-overlay.active {
  display: block;
  opacity: 1;
}

/* --- Social Links in Sidebar --- */
.sidebar-socials {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) 0;
}

.sidebar-social-link {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  transition: all var(--transition-fast);
}

.sidebar-social-link:hover {
  background: var(--glass-bg);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* ============================================
   Collapsed State Styles
   ============================================ */
.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .sidebar-logo-text,
.sidebar.collapsed .new-chat-btn span,
.sidebar.collapsed .sidebar-section-label,
.sidebar.collapsed .sidebar-item-text,
.sidebar.collapsed .sidebar-item-badge,
.sidebar.collapsed .sidebar-footer-item span,
.sidebar.collapsed .dark-mode-toggle span {
  display: none;
}

.sidebar.collapsed .sidebar-header {
  padding: var(--space-5) var(--space-3);
  justify-content: center;
}

.sidebar.collapsed .sidebar-controls {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  display: none; /* Hide toggle btn in header when collapsed? Actually no, let's keep it visible but repositioned */
}

/* Better positioning for collapsed state */
.sidebar.collapsed .sidebar-header {
  flex-direction: column;
  gap: var(--space-4);
}

.sidebar.collapsed .sidebar-controls {
  position: static;
  transform: none;
  display: flex;
}

.sidebar.collapsed .new-chat-btn {
  margin: var(--space-4) var(--space-2);
  padding: var(--space-3);
  justify-content: center;
}

.sidebar.collapsed .sidebar-item {
  padding: var(--space-3);
  justify-content: center;
}

.sidebar.collapsed .sidebar-item-icon {
  margin: 0;
}

.sidebar.collapsed .sidebar-footer-item,
.sidebar.collapsed .dark-mode-toggle {
  padding: var(--space-2);
  justify-content: center;
}

.sidebar.collapsed .toggle-switch {
  display: none;
}

/* Adjust main content when sidebar is collapsed */
.sidebar.collapsed + .chat-area {
  width: calc(100vw - var(--sidebar-collapsed-width));
}