/* The conversation (素 Plain §3.1, §3.3, §3.4, §3.11): nav bar, transcript,
   activity rows, receipts, the capsule composer. */

.chat {
  background: var(--bg);
}

.nav-bar.chat-bar {
  min-height: calc(var(--nav-h) + var(--safe-top));
  padding: var(--safe-top) var(--s-2) 0;
  background: var(--bar);
}

.chat-head {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
  max-width: 56vw;
}

.chat-title {
  max-width: 100%;
}

.chat-sub {
  margin: 0;
  color: var(--label-2);
  font-size: var(--t-caption);
  line-height: 1.3;
  white-space: nowrap;
}

.nav-count {
  position: absolute;
  top: 5px;
  right: 3px;
}

.icon-btn .count:not([data-tone="waiting"]) {
  background: var(--accent-fill);
}

/* ── Connection banner: one row under the nav bar ─────────── */
.conn-banner.rc {
  display: grid;
  /* BUG-12: minmax(0, 1fr), not 1fr: a long line never widens the banner past the screen. */
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--s-2);
  flex: none;
  min-width: 0;
  min-height: 40px;
  padding: var(--s-1) var(--s-2) var(--s-1) var(--s-4);
  background: var(--fill);
  color: var(--label);
  font-size: var(--t-footnote);
  font-weight: 500;
  line-height: 1.35;
  animation: fade var(--d-base) var(--e-standard);
}

.conn-banner.rc[hidden] {
  display: none;
}

.rc-icon {
  display: grid;
  color: var(--label-2);
}

.rc-text {
  min-width: 0;
  overflow-wrap: anywhere;
}

.rc-retry {
  flex: none;
  min-height: 36px;
  white-space: nowrap;
  font-size: var(--t-footnote);
  font-weight: 600;
}

.rc-retry[hidden] {
  display: none;
}

.conn-banner[data-state="back"] .rc-icon {
  color: var(--success);
}

.conn-banner[data-tone="error"] .rc-icon,
.conn-banner[data-state="revoked"] .rc-icon {
  color: var(--danger);
}

/* Very narrow screens (or large text): the button goes under the text. */
@media (max-width: 340px) {
  .conn-banner.rc {
    grid-template-columns: auto minmax(0, 1fr);
  }
  .rc-retry {
    grid-column: 2;
    justify-self: start;
  }
}

/* ── Transcript ─────────────────────────────────────────── */
.scroller {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  scroll-padding-bottom: var(--s-6);
}

.thread {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
  max-width: 720px;
  margin: 0 auto;
  padding: var(--s-4) var(--phone-gutter) var(--s-2);
}

.item[data-enter="true"] {
  animation: fade var(--d-base) var(--e-standard);
}

.item.user {
  display: flex;
  justify-content: flex-end;
  padding-left: 22%;
}

.bubble {
  max-width: 100%;
  padding: var(--s-2) 14px;
  border-radius: var(--r-bubble);
  background: var(--fill);
  color: var(--label);
  font-size: var(--t-body);
  line-height: 1.45;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.item.assistant {
  font-size: var(--t-body);
  line-height: 1.53; /* 17 / 26 */
  overflow-wrap: anywhere;
}

.item.assistant p,
.task-result-text p {
  margin: 0 0 var(--s-3);
}

.item.assistant > :last-child,
.task-result-text > :last-child {
  margin-bottom: 0;
}

.item.assistant ul,
.item.assistant ol,
.task-result-text ul,
.task-result-text ol {
  margin: 0 0 var(--s-3);
  padding-left: 1.3em;
}

.item.assistant li + li {
  margin-top: var(--s-1);
}

.item.assistant pre,
.task-result-text pre {
  margin: 0 0 var(--s-3);
  padding: var(--s-3);
  overflow-x: auto;
  border-radius: var(--r-md);
  background: var(--fill);
  font-family: var(--font-mono);
  font-size: var(--t-footnote);
  line-height: 1.5;
}

/* A single caret at the end while it streams (no per-token fade). */
.item.assistant[data-streaming="true"] > :last-child::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1.1em;
  margin-left: 2px;
  background: var(--accent);
  vertical-align: -0.2em;
  animation: caret 1s steps(1) infinite;
}

@keyframes caret {
  50% {
    opacity: 0;
  }
}

.msg-edited {
  display: block;
  margin-top: var(--s-1);
  color: var(--label-2);
  font-size: var(--t-caption);
}

/* ── Activity rows (§3.4): one collapsed line per run of tool calls ── */
.act-group {
  margin: calc(var(--s-2) * -1) 0;
}

.act-sum,
.act-row,
.inline-row,
.receipt {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  width: 100%;
  min-height: 32px;
  margin: 0;
  padding: var(--s-1) 0;
  border: 0;
  background: transparent;
  color: var(--label-2);
  font-size: var(--t-subhead);
  line-height: 1.35;
  text-align: left;
}

.act-sum:active,
.act-row:active,
.inline-row:active {
  opacity: 0.6;
}

.act-icon {
  display: grid;
  place-items: center;
  flex: none;
  width: 20px;
  height: 20px;
  color: var(--label-2);
}

.act-icon[data-tone="danger"] {
  color: var(--danger);
}

.act-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.act-state {
  flex: none;
  font-size: var(--t-footnote);
}

.act-state[data-tone="danger"],
.act-row[data-state="fail"] .act-label {
  color: var(--danger);
}

.act-chev {
  display: grid;
  flex: none;
  color: var(--label-3);
  transition: transform var(--d-fast) var(--e-standard);
}

.act-chev .icon,
.inline-row > .icon {
  stroke-width: 2;
}

.act-group[data-open="true"] .act-chev {
  transform: rotate(90deg);
}

.act-list {
  padding: 0 0 var(--s-1);
  animation: fade var(--d-base) var(--e-standard);
}

.act-list .act-row {
  min-height: 30px;
  font-size: var(--t-footnote);
}

/* A decided approval: one line, the time on the right. */
.receipt {
  color: var(--label-2);
}

.receipt[data-decision="approved"] .act-icon {
  color: var(--success);
}

.receipt[data-decision="denied"] .act-icon {
  color: var(--label-2);
}

.receipt-time {
  flex: none;
  font-size: var(--t-footnote);
  font-variant-numeric: tabular-nums;
}

/* 需要你：付款 NT$1,280 ›, and 「Alca 學會了」 */
.pending-slot,
.learned {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--phone-gutter);
}

.pending-slot:empty {
  display: none;
}

.learned {
  padding-bottom: var(--s-1);
}

.inline-row {
  min-height: 44px;
  color: var(--label);
}

.pending-row {
  color: var(--waiting);
  font-weight: 600;
}

.pending-row .act-icon {
  color: var(--waiting);
}

.inline-row > .icon {
  flex: none;
  color: var(--label-3);
}

.inline-cta {
  flex: none;
  color: var(--accent);
}

/* A worker's report: a task row in the transcript. */
.item.report,
.item.receipt {
  margin: calc(var(--s-1) * -1) 0;
}

.report-row {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  width: 100%;
  min-height: 56px;
  padding: var(--s-2) var(--s-3);
  border: 0;
  border-radius: var(--r-lg);
  background: var(--fill-hover);
  color: var(--label);
  text-align: left;
}

button.report-row:active {
  background: var(--fill);
}

.report-row .row-icon {
  width: 24px;
  height: 24px;
}

.rp-text {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.rp-title {
  font-size: var(--t-subhead);
  font-weight: 600;
  line-height: 1.35;
}

.rp-sub {
  display: -webkit-box;
  overflow: hidden;
  color: var(--label-2);
  font-size: var(--t-footnote);
  line-height: 1.4;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow-wrap: anywhere;
}

.thinking {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  color: var(--label-2);
  font-size: var(--t-subhead);
}

.chat-note {
  margin: var(--s-3) var(--phone-gutter) 0;
  color: var(--label-2);
  font-size: var(--t-footnote);
  text-align: center;
}

/* ── Empty conversation (§3.10): a line at ~40% and three suggestions ── */
.empty {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  max-width: 560px;
  margin: 0 auto;
  min-height: 100%;
  padding: 26vh var(--phone-gutter) var(--s-4);
}

.empty-line {
  margin: 0 0 var(--s-4);
  padding: 0 var(--s-1);
  font-family: var(--font-display);
  font-size: var(--t-title3);
  font-weight: 600;
  line-height: 1.3;
}

.suggestions {
  background: var(--fill-hover);
}

.suggestion .row-icon {
  color: var(--accent);
}

@media (orientation: landscape) and (max-height: 500px) {
  .empty {
    padding-top: var(--s-6);
  }
}

/* ── Dock: composer ─────────────────────────────────────── */
.dock {
  position: relative;
  flex: none;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: var(--s-2) var(--s-3) max(var(--safe-bottom), var(--s-2));
  background: var(--bg);
}

/* Keyboard up: the app already ends at the keyboard (viewport.ts), and the
   home indicator is under the keyboard, so no safe-area gap above it. */
:root[data-keyboard="open"] .dock {
  padding-bottom: var(--s-2);
}

.composer {
  display: flex;
  align-items: flex-end;
  gap: var(--s-2);
  min-height: 40px;
  padding: 4px 4px 4px var(--s-4);
  border-radius: var(--r-full);
  background: var(--fill);
}

.chat[data-multiline="true"] .composer {
  border-radius: 20px;
}

.composer-input {
  flex: 1;
  min-width: 0;
  max-height: 132px;
  margin: 0;
  padding: 5px 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--label);
  font-size: var(--t-field);
  line-height: 1.4;
  resize: none;
}

.composer-input::placeholder {
  color: var(--placeholder);
}

.send-btn {
  display: grid;
  place-items: center;
  flex: none;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--accent-fill);
  color: #ffffff;
  transition:
    opacity var(--d-fast) linear,
    transform var(--d-fast) var(--e-standard);
}

.send-btn .icon {
  stroke-width: 2.25;
}

/* Hidden until there is something to send (or a reply to stop). */
.send-btn[data-mode="idle"],
.send-btn:disabled:not([data-mode="send"]) {
  opacity: 0;
  transform: scale(0.6);
  pointer-events: none;
}

.send-btn:disabled[data-mode="send"] {
  opacity: 0.4;
}

.send-btn[data-mode="stop"] {
  background: var(--label);
  color: var(--bg);
}

.send-btn[data-mode="stop"] .icon {
  fill: currentColor;
  stroke-width: 0;
}

.send-btn:active:not(:disabled) {
  opacity: 0.7;
}

.tech-sheet {
  padding-bottom: var(--s-4);
}

.ts-title {
  margin: 0 0 var(--s-2);
  padding: 0 var(--s-4);
  font-size: var(--t-subhead);
  color: var(--label-2);
}

.tech-sheet .tech {
  margin-top: 0;
}