:root {
  --bg: #0e1117;
  --fg: #e6edf3;
  --accent: #00ff9c;
  --user: #00ff9c;
  --bot: #36c9ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.app {
  display: flex;
  flex-direction: column;
  height: 92vh;
  width: 100%;
  max-width: 900px;
  border: 1px solid #222;
  border-radius: 12px;
  overflow: hidden;
  background: #151922;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
}

header {
  padding: 1rem;
  background: #10131a;
  border-bottom: 1px solid #222;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .75rem;
  align-items: center;
}
header h1 {
  margin: 0;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: .3px;
}
.subtitle { margin: .2rem 0 0; font-size: 0.92rem; color: #aab2bd; }
.controls label { color: #aab2bd; font-size: .9rem; }
.controls select {
  margin-left: .4rem;
  background: #1a1e27; color: var(--fg);
  border: 1px solid #2b3240; border-radius: 6px; padding: .4rem .6rem;
}

#chat {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.msg {
  margin: 0.2rem 0;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  line-height: 1.5;
  max-width: 85%;
  word-wrap: break-word;
  white-space: pre-wrap;
}
.user {
  background: rgba(0, 255, 156, 0.08);
  color: var(--user);
  align-self: flex-end;
  border: 1px solid rgba(0,255,156,0.25);
}
.bot {
  background: rgba(54, 201, 255, 0.08);
  color: var(--bot);
  align-self: flex-start;
  border: 1px solid rgba(54,201,255,0.25);
}

footer {
  display: grid; grid-template-columns: 1fr auto; gap: .6rem;
  padding: .8rem;
  border-top: 1px solid #222;
  background: #10131a;
}
textarea {
  resize: none;
  border: 1px solid #2b3240;
  background: #1a1e27;
  color: var(--fg);
  padding: 0.8rem;
  border-radius: 10px;
  min-height: 52px;
}
button {
  padding: 0 1.2rem;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #001b0f;
  font-weight: 800;
  cursor: pointer;
}
button:disabled { opacity: .6; cursor: not-allowed; }
.status-warn { color: #ffb84d; }
.status-ok { color: #2ee480; }
.status-bad { color: #ff5e5e; }