/* Chat message list + bubbles + tool chips. */
#messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-3) var(--space-3) 0;
  -webkit-overflow-scrolling: touch;
}

.msg {
  display: flex;
  margin-bottom: var(--space-2);
}
.msg.user {
  justify-content: flex-end;
}
.msg.agent {
  justify-content: flex-start;
}
.msg.system {
  justify-content: center;
}

.bubble {
  max-width: 82%;
  min-width: 0;
  padding: 8px 12px;
  border-radius: var(--radius-lg);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}
.msg.user .bubble {
  background: var(--user);
  color: #fff;
  border-bottom-right-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
}
.msg.user.failed .bubble {
  background: var(--warn, #c2410c);
  position: relative;
}
.msg.user.failed .bubble::after {
  content: "✕ failed";
  display: block;
  font-size: var(--fs-xs);
  margin-top: 4px;
  opacity: 0.85;
}
.msg.agent .bubble {
  background: var(--bg-1);
  color: var(--fg-0);
  border: 1px solid var(--border-1);
  border-bottom-left-radius: var(--radius-sm);
}
.msg.system .bubble {
  background: transparent;
  color: var(--fg-2);
  font-size: var(--fs-xs);
  font-style: italic;
  text-align: center;
}

/* Tool chip — inline gray monospace line that expands to show full input. */
.tool-wrap {
  margin-bottom: var(--space-2);
}
.tool-chip {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--fg-1);
  padding: 2px var(--space-4);
  line-height: 1.5;
  word-break: break-all;
  user-select: text;
}
.tool-chip summary {
  list-style: none;
  cursor: pointer;
  display: block;
  outline: none;
}
.tool-chip summary::-webkit-details-marker {
  display: none;
}
.tool-chip .marker {
  color: var(--fg-2);
  margin-right: 6px;
  display: inline-block;
  transition: transform var(--t-fast);
  width: 1em;
  text-align: center;
}
.tool-chip[open] .marker {
  transform: rotate(90deg);
  color: var(--fg-1);
}
.tool-chip .tool-name {
  color: var(--fg-0);
  font-weight: 500;
}
.tool-chip pre.raw {
  margin: 6px 0 var(--space-2) 18px;
  padding: var(--space-2) var(--space-3);
  background: var(--bg-3);
  color: var(--fg-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 360px;
  overflow-y: auto;
}

/* Image attachments. */
.tool-images,
.agent .images,
.user .images {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-2);
}
.tool-images {
  margin: var(--space-2) 0 0 var(--space-4);
}
.tool-images img,
.agent .images img,
.user .images img {
  max-width: 220px;
  max-height: 220px;
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: pointer;
  border: 1px solid var(--border-1);
  transition: transform var(--t-fast);
}
.tool-images img:active,
.agent .images img:active {
  transform: scale(0.98);
}

/* Transient row shown while a freshly switched session's history streams in. */
.msg-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: var(--space-3) 0;
  color: var(--fg-2);
  font-size: var(--fs-xs);
  font-style: italic;
}
.msg-loading .dot {
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--fg-2);
  animation: blink 1.2s infinite;
}
.msg-loading .dot:nth-child(2) {
  animation-delay: 0.18s;
}
.msg-loading .dot:nth-child(3) {
  animation-delay: 0.36s;
}
.msg-loading .text {
  margin-left: var(--space-2);
}

/* Typing indicator above the input. */
.typing {
  padding: 4px var(--space-4) 0;
  color: var(--fg-2);
  font-size: var(--fs-xs);
  font-style: italic;
  display: none;
}
.typing.show {
  display: block;
}
.typing .dot {
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--fg-2);
  margin-left: 2px;
  vertical-align: middle;
  animation: blink 1.2s infinite;
}
.typing .dot:nth-child(2) {
  animation-delay: 0.18s;
}
.typing .dot:nth-child(3) {
  animation-delay: 0.36s;
}
@keyframes blink {
  0%,
  80%,
  100% {
    opacity: 0.2;
    transform: scale(0.8);
  }
  40% {
    opacity: 1;
    transform: scale(1);
  }
}

/* Footer / input. */
footer {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  padding-bottom: calc(var(--space-2) + env(safe-area-inset-bottom, 0px));
  background: var(--bg-1);
  border-top: 1px solid var(--border-1);
  flex-shrink: 0;
}
#input {
  flex: 1;
  resize: none;
  background: var(--bg-0);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
  color: var(--fg-0);
  padding: 8px 12px;
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  min-height: 36px;
  max-height: 140px;
  transition:
    border-color var(--t-fast),
    background var(--t-fast);
  /* Hide the rectangular browser scrollbar — it pokes into the rounded
     corners and clips the focus outline. The textarea is short (≤140px),
     touch / arrow-key scrolling is enough. */
  scrollbar-width: none;
}
#input::-webkit-scrollbar {
  display: none;
}
#input:focus {
  outline: 2px solid var(--user);
  outline-offset: 2px;
  border-color: transparent;
  background: var(--bg-2);
}
#input::placeholder {
  color: var(--fg-2);
}
#send {
  background: var(--user);
  color: #fff;
  font-weight: 600;
  font-size: var(--fs-base);
  padding: 0 var(--space-4);
  height: 36px;
  border-radius: var(--radius-lg);
  flex-shrink: 0;
  transition:
    background var(--t-fast),
    transform var(--t-fast);
}
#send:hover {
  background: var(--user-hover);
}
#send:active {
  transform: scale(0.97);
}
#send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}