/* 多会话列表与双栏布局。 */

.assistant-panel {
  grid-template-columns: 280px minmax(0, 1fr);
  grid-template-rows: 1fr;
}

.conversation-sidebar {
  min-width: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  border-right: 1px solid var(--border);
  background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
  margin: 0;
  font-size: 1rem;
}

.sidebar-header p {
  margin: 2px 0 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--muted-fg);
  text-transform: uppercase;
}

.new-chat-btn {
  border: 0;
  border-radius: 999px;
  padding: 7px 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #ffffff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.new-chat-btn:hover,
.new-chat-btn:focus-visible {
  transform: translateY(-1px);
  box-shadow: var(--shadow-accent);
  outline: none;
}

.conversation-list {
  min-height: 0;
  overflow-y: auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.conversation-empty {
  margin: 10px 4px;
  color: var(--muted-fg);
  font-size: 12px;
}

.conversation-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: stretch;
  gap: 6px;
}

.conversation-open,
.conversation-delete {
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.conversation-open {
  min-width: 0;
  border-radius: 12px;
  padding: 9px 10px;
  color: var(--fg);
  text-align: left;
}

.conversation-open span,
.conversation-open small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-open span {
  font-size: 13px;
  font-weight: 600;
}

.conversation-open small {
  margin-top: 2px;
  color: var(--muted-fg);
  font-size: 11px;
}

.conversation-row.active .conversation-open,
.conversation-open:hover,
.conversation-open:focus-visible {
  border-color: var(--accent-border);
  background: var(--accent-light);
  outline: none;
}

.conversation-delete {
  align-self: center;
  border-radius: 999px;
  padding: 5px 8px;
  color: var(--muted-fg);
  font-size: 11px;
}

.conversation-delete:hover,
.conversation-delete:focus-visible {
  border-color: rgba(211, 71, 71, 0.28);
  background: rgba(211, 71, 71, 0.08);
  color: var(--error);
  outline: none;
}

.chat-shell {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

@media (max-width: 920px) {
  .assistant-panel {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr);
  }

  .conversation-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
    max-height: 210px;
  }

  .conversation-list {
    flex-direction: row;
    overflow-x: auto;
  }

  .conversation-row {
    min-width: 220px;
  }
}