* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  max-width: 720px;
  margin: 0 auto;
  padding: 1rem;
  background: #f6f4f1;
  color: #1a1a1a;
}
header h1 { margin: 0; font-size: 1.4rem; }
.sub { margin: 0.25rem 0; color: #555; font-size: 0.9rem; }
.status { font-size: 0.85rem; color: #333; }
.log {
  min-height: 50vh;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1rem;
  margin: 1rem 0;
  overflow-y: auto;
}
.msg { margin-bottom: 1rem; white-space: pre-wrap; line-height: 1.45; }
.msg.user { color: #0b3d91; }
.msg.assistant { color: #222; }
.msg.system { color: #666; font-size: 0.9rem; }
.composer { display: flex; gap: 0.5rem; }
.composer textarea { flex: 1; padding: 0.6rem; font: inherit; border-radius: 6px; border: 1px solid #ccc; }
.composer button, .end-bar button {
  padding: 0.5rem 0.75rem;
  font: inherit;
  border-radius: 6px;
  border: 1px solid #888;
  background: #fff;
  cursor: pointer;
}
.end-bar { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.link-btn {
  margin-top: 0.5rem;
  padding: 0.35rem 0.6rem;
  font-size: 0.85rem;
  border: 1px solid #ccc;
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
}
.composer button:disabled { opacity: 0.5; }