/* ------------------------------
   Root Variables (Light + Dark)
--------------------------------*/
:root {
  --sidebar-width: 240px;
  --sidebar-collapsed: 60px;

  --bg: #f5f5f5;
  --panel: #ffffff;
  --text: #111;
  --text-light: #666;
  --border: #d0d0d0;

  --accent: #0078ff;
  --accent-hover: #0063d6;

  --msg-user: #d0eaff;
  --msg-ai: #ececec;

  --radius: 12px;
  --transition: 0.25s ease;
}

body.dark {
  --bg: #0f172a;
  --panel: #1e293b;
  --text: #e5e7eb;
  --text-light: #94a3b8;
  --border: #334155;

  --msg-user: #1d4ed8;
  --msg-ai: #334155;
}

/* ------------------------------
   Layout
--------------------------------*/
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, sans-serif;
  overflow: hidden;
}

#app {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* ------------------------------
   Sidebar
--------------------------------*/
#sidebar {
  width: var(--sidebar-width);
  background: var(--panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: width var(--transition);
  overflow: hidden;
}

#sidebar.collapsed {
  width: var(--sidebar-collapsed);
}

#sidebar-header {
  display: flex;
  align-items: center;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  gap: 10px;
}

#toggleSidebar {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text);
}

#sidebar-title {
  font-size: 16px;
  font-weight: 600;
  transition: opacity var(--transition);
}

#sidebar.collapsed #sidebar-title {
  opacity: 0;
}

/* New Chat Button */
.sidebar-btn {
  margin: 12px;
  padding: 10px;
  border-radius: var(--radius);
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  transition: background var(--transition);
}

.sidebar-btn:hover {
  background: var(--accent-hover);
}

#sidebar.collapsed .sidebar-btn span {
  display: none;
}

/* Search Box */
#searchBox {
  display: flex;
  align-items: center;
  margin: 0 12px;
  padding: 8px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  gap: 8px;
}

#searchInput {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text);
}

#sidebar.collapsed #searchInput {
  display: none;
}

/* Chat List */
#chatList {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.chat-item {
  padding: 10px 14px;
  margin: 4px 8px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition);
}

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

.chat-item.active {
  background: var(--accent);
  color: white;
}

.chat-title {
  font-size: 14px;
  font-weight: 600;
}

.chat-last {
  font-size: 12px;
  color: var(--text-light);
}

#sidebar.collapsed .chat-title,
#sidebar.collapsed .chat-last {
  display: none;
}

/* ------------------------------
   Chat Panel
--------------------------------*/
#chatPanel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  transition: margin-right var(--transition);
}

#sidebar.collapsed + #chatPanel {
  margin-right: var(--sidebar-collapsed);
}

#sidebar.expanded + #chatPanel {
  margin-right: var(--sidebar-width);
}

/* Top Bar */
#topBar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

#toggleTheme {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text);
}

/* Messages */
#messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.msg {
  max-width: 70%;
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 12px;
  line-height: 1.6;
  white-space: pre-wrap;
}

.msg.user {
  background: var(--msg-user);
  margin-left: auto;
}

.msg.ai {
  background: var(--msg-ai);
  margin-right: auto;
}

/* Typing Animation */
.typing {
  display: inline-block;
  width: 30px;
}

.typing span {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin: 0 2px;
  background: var(--text-light);
  border-radius: 50%;
  animation: blink 1.4s infinite both;
}

.typing span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes blink {
  0% { opacity: .2; }
  20% { opacity: 1; }
  100% { opacity: .2; }
}

/* Input Area */
#inputArea {
  padding: 12px;
  background: var(--panel);
  border-top: 1px solid var(--border);
}

#inputRow {
  display: flex;
  gap: 8px;
}

#promptInput {
  flex: 1;
  padding: 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}

#inputRow button {
  background: var(--accent);
  border: none;
  padding: 10px;
  border-radius: var(--radius);
  color: white;
  cursor: pointer;
  font-size: 18px;
}

#visionRow {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

#visionUrl {
  flex: 1;
  padding: 8px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}

/* Image Preview */
#imagePreview img {
  max-width: 120px;
  border-radius: var(--radius);
  margin-bottom: 8px;
  border: 1px solid var(--border);
}

/* Markdown Styling */
.msg.ai h1,
.msg.ai h2,
.msg.ai h3 {
  margin: 8px 0;
}

.msg.ai code {
  background: rgba(0,0,0,0.1);
  padding: 2px 4px;
  border-radius: 4px;
}

.msg.ai pre {
  background: rgba(0,0,0,0.15);
  padding: 10px;
  border-radius: var(--radius);
  overflow-x: auto;
}