* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --border: #2a2a2a;
  --text: #e0e0e0;
  --text-dim: #888;
  --accent: #7c6fe0;
  --user-bg: #1a1a2e;
  --assistant-bg: #141414;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 800px;
  margin: 0 auto;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 16px;
  font-weight: 600;
}

#user-info {
  font-size: 13px;
  color: var(--text-dim);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.message {
  margin-bottom: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message.user {
  background: var(--user-bg);
  border: 1px solid var(--border);
}

.message.assistant {
  background: var(--assistant-bg);
  border: 1px solid var(--border);
}

.message .role {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.message.pending {
  opacity: 0.6;
}

.message.error {
  border-color: #e74c3c;
  color: #e74c3c;
}

.chat-input {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

#chat-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 8px 12px;
  font-family: inherit;
  font-size: 14px;
  resize: none;
}

#chat-input:focus {
  outline: none;
  border-color: var(--accent);
}

#send-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 8px 20px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 500;
}

#send-btn:hover { opacity: 0.9; }
#send-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-dim);
  font-size: 14px;
}