/**
 * @license
 * Copyright 2025 Qwen Team
 * SPDX-License-Identifier: Apache-2.0
 *
 * ChatViewer component styles - matching vscode-ide-companion visual appearance
 * Note: Timeline styles are inherited from shared styles/timeline.css
 */

/* ===========================
   Main Chat Viewer Container
   =========================== */
.chat-viewer-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  background-color: var(--app-background, var(--app-primary-background, #1e1e1e));
  color: var(--app-primary-foreground, #cccccc);
  font-family: var(--vscode-chat-font-family, var(--vscode-font-family, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif));
  font-size: var(--vscode-chat-font-size, 13px);
  overflow: hidden;
}

/* ===========================
   Messages Container (scrollable)
   =========================== */
.chat-viewer-messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px;
  display: flex;
  flex-direction: column;
  position: relative;
  min-width: 0;
  /* Enable smooth scrolling for auto-scroll */
  scroll-behavior: smooth;
}

/* Dark theme scrollbar styling */
.chat-viewer-messages::-webkit-scrollbar {
  width: 8px;
}

.chat-viewer-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-viewer-messages::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

.chat-viewer-messages::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Light theme scrollbar styling */
@media (prefers-color-scheme: light) {
  .chat-viewer-container.auto-theme .chat-viewer-messages::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
  }
  
  .chat-viewer-container.auto-theme .chat-viewer-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
  }
}

/* Force light theme scrollbar */
.chat-viewer-container.light-theme .chat-viewer-messages::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.2);
}

.chat-viewer-container.light-theme .chat-viewer-messages::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
}

/* Message item base styles */
.chat-viewer-messages > * {
  display: flex;
  gap: 0;
  align-items: flex-start;
  text-align: left;
  padding: 8px 0;
  flex-direction: column;
  position: relative;
  animation: chatViewerFadeIn 0.2s ease-in;
}

.chat-viewer-messages > *:not(:last-child) {
  padding-bottom: 0;
  padding-top: 0;
}

/* Disable overflow anchoring on individual items for manual scroll control */
.chat-viewer-messages > * {
  overflow-anchor: none;
}

/* User message container spacing */
.chat-viewer-messages .user-message-container:first-child {
  margin-top: 0;
}

/* ===========================
   Timeline Wrapper Styles
   =========================== */

/* Tool call wrapper - transparent container for timeline continuity */
.chat-viewer-toolcall-wrapper {
  position: relative;
}

/* ===========================
   Animations
   =========================== */
@keyframes chatViewerFadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===========================
   Empty State
   =========================== */
.chat-viewer-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 200px;
  color: var(--app-secondary-foreground, rgba(255, 255, 255, 0.6));
  font-size: 14px;
  text-align: center;
  padding: 20px;
}

.chat-viewer-empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.chat-viewer-empty-text {
  max-width: 300px;
  line-height: 1.5;
}

/* ===========================
   Scroll Anchor (for auto-scroll)
   =========================== */
.chat-viewer-scroll-anchor {
  height: 1px;
  overflow-anchor: auto;
}

/* ===========================
   ChatViewer-specific Styles
   =========================== */

/* Better spacing between message groups */
.chat-viewer-messages .user-message-container {
  margin-top: 16px;
}

/* Ensure proper stacking context */
.chat-viewer-messages > * {
  isolation: isolate;
}

/* Responsive adjustments for ChatViewer */
@media (max-width: 600px) {
  .chat-viewer-messages {
    padding: 12px;
  }
}