:root {
  color-scheme: dark;
  --bg: #12141a;
  --panel: #1a1d26;
  --border: #2b2f3a;
  --text: #e6e8ef;
  --muted: #8a8f9c;
  --accent: #5b8cff;
  --user-bubble: #2a3348;
  --assistant-bubble: #1f2430;
  --tool-bubble: #171a22;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
}

.login-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.login-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  width: 320px;
  text-align: center;
}

.login-box h1 { margin: 0 0 0.25rem; }
.login-box .subtitle { color: var(--muted); margin: 0 0 1.5rem; font-size: 0.9rem; }

.login-box input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f1117;
  color: var(--text);
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.login-box button {
  width: 100%;
  padding: 0.6rem;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: white;
  font-size: 1rem;
  cursor: pointer;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 720px;
  margin: 0 auto;
}

header {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

header h1 { font-size: 1.1rem; margin: 0; }

.badge {
  font-size: 0.7rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.5rem;
}

#reset-btn {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
}

#reset-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

#messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.msg {
  max-width: 85%;
  padding: 0.55rem 0.8rem;
  border-radius: 10px;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-size: 0.95rem;
  line-height: 1.4;
}

.msg.user {
  align-self: flex-end;
  background: var(--user-bubble);
}

.msg.assistant {
  align-self: flex-start;
  background: var(--assistant-bubble);
}

.msg.tool {
  align-self: flex-start;
  background: var(--tool-bubble);
  color: var(--muted);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.8rem;
  border: 1px solid var(--border);
  max-width: 95%;
}

#chat-form {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
}

#message-input {
  flex: 1;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f1117;
  color: var(--text);
  font-size: 1rem;
}

#chat-form button {
  padding: 0.65rem 1.1rem;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: white;
  font-size: 1rem;
  cursor: pointer;
}