:root {
  --bg: #0f1115; --panel: #181b21; --text: #e6e8eb; --muted: #8a8f98;
  --accent: #4f8cff; --bubble-user: #2b6cb0; --bubble-bot: #23262d;
  --danger: #d65a5a;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg); color: var(--text); min-height: 100vh;
}
.login-shell {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
}
.login-card {
  background: var(--panel); padding: 2rem; border-radius: 10px;
  width: 100%; max-width: 360px; box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}
.login-card h1 { margin: 0 0 1.2rem; font-size: 1.4rem; }
.login-card label { display: block; margin-top: 0.8rem; color: var(--muted); font-size: 0.85rem; }
.login-card input {
  width: 100%; padding: 0.6rem 0.7rem; margin-top: 0.3rem;
  background: #0f1115; color: var(--text); border: 1px solid #2a2e36; border-radius: 6px;
}
.login-card button {
  margin-top: 1.2rem; width: 100%; padding: 0.7rem; border: 0; border-radius: 6px;
  background: var(--accent); color: white; font-weight: 600; cursor: pointer;
}
.login-card .err { color: var(--danger); margin-top: 0.8rem; min-height: 1.2em; font-size: 0.9rem; }

.chat-shell { display: flex; flex-direction: column; height: 100vh; }
.topbar {
  display: flex; align-items: center; gap: 0.8rem; padding: 0.6rem 1rem;
  background: var(--panel); border-bottom: 1px solid #2a2e36;
}
.brand { font-weight: 700; }
.user { color: var(--muted); font-size: 0.9rem; }
.spacer { flex: 1; }
.link {
  background: none; border: 0; color: var(--accent); cursor: pointer;
  text-decoration: none; font-size: 0.95rem;
}
.stream {
  flex: 1; overflow-y: auto; padding: 1rem; display: flex; flex-direction: column; gap: 0.6rem;
}
.bubble {
  max-width: 70%; padding: 0.6rem 0.8rem; border-radius: 14px;
  white-space: pre-wrap; word-wrap: break-word; line-height: 1.35;
}
.bubble.user { align-self: flex-end; background: var(--bubble-user); color: white; }
.bubble.bot  { align-self: flex-start; background: var(--bubble-bot); }
.bubble.meta { align-self: center; color: var(--muted); font-size: 0.85rem; }
.composer {
  display: flex; align-items: end; gap: 0.4rem; padding: 0.6rem;
  background: var(--panel); border-top: 1px solid #2a2e36;
}
.composer textarea {
  flex: 1; resize: none; min-height: 38px; max-height: 200px;
  padding: 0.5rem 0.7rem; border-radius: 8px; border: 1px solid #2a2e36;
  background: #0f1115; color: var(--text); font-size: 1rem;
}
.composer .iconbtn {
  background: none; border: 1px solid #2a2e36; border-radius: 8px;
  padding: 0.4rem 0.55rem; cursor: pointer; color: var(--text);
}
.composer .iconbtn.active { background: var(--danger); border-color: var(--danger); }
.composer .send {
  background: var(--accent); color: white; border: 0; padding: 0.55rem 1rem;
  border-radius: 8px; font-weight: 600; cursor: pointer;
}
.composer .send:disabled { opacity: 0.5; cursor: wait; }