/* Sidebar Styles */
.sidebar {
  width: 260px;
  min-width: 200px;
  max-width: 500px;
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform var(--transition-normal);
  position: relative;
  resize: horizontal;
  overflow: hidden;
}

.sidebar.collapsed {
  transform: translateX(-100%);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  color: var(--text-primary);
}

.sidebar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

#favorites-btn.favorited {
  color: var(--warning);
}

#favorites-btn.favorited i {
  color: var(--warning);
}

.sidebar-icon {
  font-size: 1.5rem;
} 

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm);
}

.sidebar-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-subtle);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

/* Chat List */
.chat-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.chat-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-fast);
  border: 1px solid transparent;
  position: relative;
  min-height: 50px;
}

.chat-item:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
}

.chat-item.active {
  background: var(--bg-card);
  border-color: var(--accent-primary);
}

.chat-item-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.chat-item-content {
  flex: 1;
  min-width: 0;
}

.chat-item-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  position: relative;
}

.chat-item-title:hover {
  overflow: visible;
}

.chat-item-title:hover::after {
  content: attr(data-full-title);
  position: absolute;
  left: 0;
  top: 100%;
  background: var(--bg-card);
  color: var(--text-primary);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  white-space: normal;
  max-width: 300px;
  word-wrap: break-word;
  font-size: 0.75rem;
  border: 1px solid var(--border-subtle);
  margin-top: 4px;
}

.chat-item-preview {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  position: relative;
}

.chat-item-title:hover,
.chat-item-preview:hover {
  overflow: visible;
}

.chat-item-title:hover::after,
.chat-item-preview:hover::after {
  content: attr(data-full-title);
  position: absolute;
  left: 0;
  top: 100%;
  background: var(--bg-card);
  color: var(--text-primary);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  white-space: normal;
  max-width: 300px;
  word-wrap: break-word;
  font-size: 0.75rem;
  border: 1px solid var(--border-subtle);
  margin-top: 4px;
}

.chat-item-preview:hover::after {
  content: attr(data-full-preview);
  font-size: 0.7rem;
}

.chat-item-time {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-left: auto;
  margin-right: 28px;
  position: relative;
}

.chat-item-actions {
  position: absolute;
  right: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  display: none;
  gap: 0;
  align-items: center;
  flex-direction: column;
  z-index: 2;
}

.chat-item:hover .chat-item-actions {
  display: flex;
}

.chat-item-favorite {
  padding: 2px;
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  font-size: 0.7rem;
  cursor: pointer;
  transition: var(--transition-fast);
  opacity: 1;
}

.chat-item-favorite.favorited {
  color: var(--warning);
}

.chat-item-favorite:hover {
  color: var(--warning);
  transform: scale(1.1);
}

.chat-item-favorite:active {
  transform: scale(0.95);
}

.chat-item-delete {
  padding: 2px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  font-size: 0.7rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.chat-item-delete:hover {
  background: var(--error);
  border-color: var(--error);
  color: white;
  transform: scale(1.1);
}

.chat-item-delete:active {
  transform: scale(0.95);
}

.chat-item-delete:focus {
  outline: 2px solid var(--error);
  outline-offset: 2px;
}

/* Content Header */
.content-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.sidebar-toggle {
  display: none;
}

.current-chat-title {
  flex: 1;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.content-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* Mobile Sidebar Overlay */
.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.sidebar-overlay.show {
  opacity: 1;
  visibility: visible;
}

/* Responsive Design */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100dvh;
    z-index: 1000;
    transform: translateX(-100%);
    resize: none;
    min-width: 280px;
    max-width: 280px;
    box-shadow: var(--shadow-xl);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .sidebar-toggle {
    display: flex;
  }
  
  .main-content {
    width: 100%;
    margin-left: 0;
    height: 100dvh;
  }
  
  .content-header {
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
  }
  
  .current-chat-title {
    font-size: 1rem;
    order: 1;
    width: 100%;
  }
  
  .work-in-progress-header {
    order: 2;
    width: 100%;
    margin: var(--spacing-xs) 0;
  }
  
  .content-actions {
    order: 3;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
  }
  
  .resize-handle {
    display: none;
  }
}

@media (max-width: 480px) {
  .sidebar {
    width: 90%;
    height: 100dvh;
    max-width: 320px;
  }
  
  .sidebar-header {
    padding: var(--spacing-md);
  }
  
  .sidebar-header .btn-icon {
    width: 44px;
    height: 44px;
  }
  
  .chat-item {
    padding: var(--spacing-sm);
    min-height: 48px;
  }
  
  .chat-item-actions {
    right: var(--spacing-md);
  }
  
  .chat-item-delete {
    padding: var(--spacing-sm);
    width: 36px;
    height: 36px;
  }
}

/* Resize Handle */
.resize-handle {
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  background: transparent;
  cursor: col-resize;
  transition: background-color var(--transition-fast);
  z-index: 10;
}

.resize-handle:hover,
.resize-handle.active {
  background: var(--accent-primary);
  width: 3px;
}

.resize-handle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 40px;
  background: transparent;
  cursor: col-resize;
}

/* Scrollbar Styles */
.sidebar-content::-webkit-scrollbar {
  width: 4px;
}

.sidebar-content::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

.sidebar-content::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: var(--radius-sm);
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}