:root {
  color-scheme: light;
  --bg: #f5f5f5;
  --panel: #ffffff;
  --border: #e0e0e0;
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #2f6fed;
  --bubble-user: #2f6fed;
  --bubble-user-text: #ffffff;
  --bubble-bot: #eef1f6;
  --bubble-bot-text: #1a1a1a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.layout {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 12px;
  gap: 8px;
  overflow-y: auto;
}

.new-chat-btn {
  padding: 10px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
}

.conversation-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.conversation-item {
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-item:hover,
.conversation-item.active {
  background: var(--bubble-bot);
}

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  max-width: 70%;
  padding: 10px 14px;
  border-radius: 12px;
  line-height: 1.4;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message.user {
  align-self: flex-end;
  background: var(--bubble-user);
  color: var(--bubble-user-text);
  border-bottom-right-radius: 2px;
}

.message.assistant {
  align-self: flex-start;
  background: var(--bubble-bot);
  color: var(--bubble-bot-text);
  border-bottom-left-radius: 2px;
}

.message.pending {
  opacity: 0.6;
}

.message-sources {
  margin-top: 6px;
  font-size: 12px;
  opacity: 0.7;
}

.chat-form {
  display: flex;
  gap: 8px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--panel);
}

.chat-form textarea {
  flex: 1;
  resize: none;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  max-height: 160px;
}

.chat-form button {
  padding: 0 20px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

.chat-form button:disabled {
  opacity: 0.5;
  cursor: default;
}

.sidebar-footer {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
}

.sidebar-footer a {
  color: var(--accent);
  cursor: pointer;
  text-decoration: none;
}

.empty-state {
  color: var(--muted);
  margin: auto;
  text-align: center;
}