.messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  /*
   * html and body are pinned (position: fixed), so a scroll that runs past
   * either end of the transcript chains into a page that cannot move and the
   * gesture is swallowed -- the list reads as stuck until it is swiped
   * again. Keep the scroll inside this box.
   */
  overscroll-behavior: contain;
  /* Claim vertical drags outright, so no delay waiting to see if the gesture
     turns into a horizontal swipe or a zoom. */
  touch-action: pan-y;
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/*
 * Deliberately NOT content-visibility: auto. Skipping the layout of
 * off-screen rows is the usual fix for a long list, but here it makes the
 * bottom of the transcript move: a skipped row is costed at its estimate
 * until it is revealed, so scrolling to the end grows scrollHeight and the
 * end is no longer where the scroll just went. Measured at 240 rows, the
 * gap reopened to ~2400px one frame after a successful scroll to bottom.
 */
.row { display: flex; gap: 10px; max-width: 100%; }
.row.user { flex-direction: row-reverse; }
.row .avatar { width: 30px; height: 30px; font-size: 0.9rem; }
.row.bot .avatar { background: var(--green-soft); }
.row.user .avatar { background: var(--green); color: #fff; }

.bubble {
  max-width: 78%;
  padding: 10px 13px;
  border-radius: 14px;
  line-height: 1.6;
  font-size: 0.93rem;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.row.user .bubble {
  background: var(--green);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.row.bot .bubble {
  background: #fff;
  border: 1px solid var(--line);
  border-bottom-left-radius: 4px;
}

.think {
  font-size: 0.78rem;
  background: #f2f5f4;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 8px;
}
.think > summary {
  cursor: pointer;
  padding: 5px 9px;
  color: var(--muted);
  list-style: none;
  user-select: none;
  display: flex; align-items: center; gap: 6px;
}
.think > summary::-webkit-details-marker { display: none; }
.think > summary::before { content: "\25B8"; font-size: 0.65rem; }
.think[open] > summary::before { content: "\25BE"; }
.think-body {
  overscroll-behavior: contain;
  padding: 0 9px 8px;
  max-height: 160px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.71rem;
  line-height: 1.5;
  color: var(--muted);
  white-space: pre-wrap;
}

.tool {
  border: 1px solid var(--green-line);
  border-left: 3px solid var(--green);
  background: var(--green-soft);
  border-radius: 7px;
  margin-bottom: 8px;
  font-size: 0.78rem;
}
.tool.running {
  animation: tool-glow 1.2s ease-in-out infinite;
}
@keyframes tool-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(15, 107, 69, 0.35); }
  50%      { box-shadow: 0 0 0 5px rgba(15, 107, 69, 0); }
}
.tool > summary {
  cursor: pointer;
  padding: 7px 10px;
  list-style: none;
  user-select: none;
  display: flex; align-items: center; gap: 6px;
}
.tool > summary::-webkit-details-marker { display: none; }
.tool > summary::before { content: "\25B8"; font-size: 0.65rem; color: var(--green-dark); }
.tool[open] > summary::before { content: "\25BE"; }
.tool-body { padding: 0 10px 8px; }
.tool-name {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--green-dark);
  display: flex; align-items: center; gap: 5px;
}
.tool.running .tool-name::after {
  content: "";
  width: 9px; height: 9px;
  border: 2px solid var(--green);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.tool-args {
  display: block;
  font-family: var(--mono);
  font-size: 0.71rem;
  color: #47574f;
  margin-top: 3px;
  word-break: break-all;
}
.tool-res {
  display: block;
  margin-top: 5px;
  padding-top: 5px;
  border-top: 1px dashed var(--green-line);
  font-size: 0.72rem;
  font-family: var(--mono);
}
.tool-res .ok { color: var(--green-dark); font-weight: 600; }
.tool-res .weak { color: var(--amber); font-weight: 600; }
.tool-res .bad { color: var(--red); font-weight: 600; }
.cands { margin-top: 4px; color: var(--muted); font-size: 0.69rem; }
.cands div { padding-left: 10px; }

.stream-err { color: var(--red); font-size: 0.78rem; display: block; margin-top: 6px; }
.timing {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 7px;
  font-variant-numeric: tabular-nums;
}
.cursor::after {
  content: "\258B";
  animation: blink 1s steps(2, start) infinite;
  opacity: 0.65;
}
@keyframes blink { to { visibility: hidden; } }

.settings-panel { padding: 6px 16px; font-size: 0.8rem; color: var(--muted); }
.settings-panel summary { cursor: pointer; }
.params-grid { display: flex; gap: 16px; padding: 8px 0; }
.param { display: flex; align-items: center; gap: 6px; }
.param input[type="number"] { width: 64px; padding: 3px 6px; }
.cands { margin-top: 7px; font-size: 0.72rem; color: var(--muted); }
.cands summary { cursor: pointer; }
.cands-table { border-collapse: collapse; margin-top: 4px; width: 100%; }
.cands-table th, .cands-table td { text-align: left; padding: 3px 6px; border-bottom: 1px solid var(--line); }
.cands-table td:last-child { font-variant-numeric: tabular-nums; white-space: nowrap; }
.cands-table tr.picked td { background: var(--green-soft); color: var(--green-dark); font-weight: 600; }