/**
 * src/css/chat-app.css
 * WhatsApp-grade chat system v1 — visual layer for chat.html + chat-app.js.
 * Tokens ONLY (src/css/design-system.css) — no forked color/spacing system.
 * Class names in this file are matched EXACTLY against what src/js/chat-app.js
 * generates (grep'd from the JS, not guessed) — see that file's `el(tag, cls)`
 * calls for the source of truth if this file is ever extended.
 *
 * Layout: two-pane on desktop; collapses to list<->thread on <=768px via the
 * `.thread-open` class chat-app.js toggles on #chatapp. Touch targets >=44px
 * throughout (--touch token). Clean at 360px (see the last media query).
 */

/* ─── Shell: two-pane layout ────────────────────────────────────────────── */
.chatapp {
  display: grid;
  grid-template-columns: min(360px, 34vw) 1fr;
  height: 100%;
  min-height: 0;
  background: var(--bg-app);
}

.chatapp-list-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--border);
  background: var(--bg-card);
}

.chatapp-thread-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  position: relative;
  background: var(--bg-app);
}

/* ─── List pane header ──────────────────────────────────────────────────── */
.chatapp-list-head {
  flex-shrink: 0;
  padding: var(--sp-4) var(--sp-4) var(--sp-3);
  border-bottom: 1px solid var(--border-soft);
}
.chatapp-list-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-3);
}
.chatapp-list-title {
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--text-1);
  margin: 0;
  letter-spacing: var(--tracking-tight);
}
.chatapp-title-actions { display: inline-flex; gap: var(--sp-1); }

.chatapp-search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.chatapp-search-wrap > .material-symbols-outlined {
  position: absolute;
  left: var(--sp-3);
  font-size: 18px;
  color: var(--text-4);
  pointer-events: none;
}
.chatapp-search {
  width: 100%;
  min-height: 40px;
  padding: 0 var(--sp-3) 0 calc(var(--sp-3) + 22px);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  background: var(--surface-100);
  font: inherit;
  font-size: var(--fs-13);
  color: var(--text-1);
  transition: border-color var(--dur-1) var(--ease-std), background var(--dur-1) var(--ease-std);
}
.chatapp-search::placeholder { color: var(--text-4); }
.chatapp-search:focus {
  outline: none;
  background: var(--surface-0);
  border-color: var(--navy-400);
  box-shadow: 0 0 0 3px var(--ring-navy);
}

/* ─── Icon buttons (shared everywhere) ──────────────────────────────────── */
.chatapp-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--touch);
  height: var(--touch);
  border-radius: var(--r-full);
  border: none;
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--dur-1) var(--ease-std), color var(--dur-1) var(--ease-std);
}
.chatapp-icon-btn:hover { background: var(--surface-100); color: var(--text-1); }
.chatapp-icon-btn:active { transform: scale(0.94); }
.chatapp-icon-btn .material-symbols-outlined { font-size: 20px; }
.chatapp-back-btn { display: none; } /* shown only on mobile, see media query */

/* ─── Conversation list ─────────────────────────────────────────────────── */
.chatapp-convo-list {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  padding: var(--sp-2) 0;
}

.chatapp-convo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  width: 100%;
  padding: var(--sp-2) var(--sp-4);
  min-height: 68px;
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: background var(--dur-1) var(--ease-std);
  position: relative;
}
.chatapp-convo:hover { background: var(--surface-50); }
.chatapp-convo.active { background: var(--navy-50); }
.chatapp-convo.active::before {
  content: '';
  position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--amber-500);
}

/* Avatars — shared shape used for convo list, thread messages, thread header,
   and member rows (chat-app.js reuses `chatapp-msg-avatar` for member-drawer
   rows too, sized down inline). */
.chatapp-convo-avatar,
.chatapp-thread-avatar,
.chatapp-msg-avatar {
  width: 48px; height: 48px;
  border-radius: var(--r-full);
  background: var(--navy-500);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--fs-16);
  flex-shrink: 0;
  text-transform: uppercase;
}
.chatapp-msg-avatar { width: 32px; height: 32px; font-size: var(--fs-13); }
.chatapp-msg-avatar-spacer { display: inline-block; width: 32px; flex-shrink: 0; }
.chatapp-thread-avatar { width: 40px; height: 40px; font-size: var(--fs-14); }
.chatapp-convo-avatar.is-group,
.chatapp-thread-avatar.is-group { background: var(--surface-600); }
.chatapp-convo-avatar.is-project,
.chatapp-thread-avatar.is-project { background: var(--amber-600); color: var(--on-amber); }

.chatapp-convo-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.chatapp-convo-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-2);
}
.chatapp-convo-name {
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--text-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chatapp-convo-time {
  font-size: var(--fs-11);
  color: var(--text-4);
  flex-shrink: 0;
  font-variant-numeric: var(--tnum);
}
.chatapp-convo-time.has-unread { color: var(--amber-600); font-weight: 700; }
.chatapp-convo-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
}
.chatapp-convo-preview {
  font-size: var(--fs-13);
  color: var(--text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 3px;
}
.chatapp-convo-flags {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}
.chatapp-flag-icon { font-size: 15px !important; color: var(--text-4); }
.chatapp-unread {
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: var(--r-full);
  background: var(--amber-500);
  color: var(--on-amber);
  font-size: var(--fs-11);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.chatapp-unread.is-muted { background: var(--surface-400); color: #fff; }

/* Per-row pin/mute quick actions — hidden until hover/focus on desktop,
   always tappable (>=44px hit target via padding) on touch. */
.chatapp-convo-actions {
  display: none;
  gap: 2px;
  flex-shrink: 0;
}
.chatapp-convo:hover .chatapp-convo-actions,
.chatapp-convo:focus-within .chatapp-convo-actions { display: inline-flex; }
.chatapp-convo-action {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-4);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.chatapp-convo-action:hover { background: var(--surface-200); color: var(--text-2); }
.chatapp-convo-action .material-symbols-outlined { font-size: 16px; }

.chatapp-ticks { display: inline-flex; color: var(--text-4); }
.chatapp-ticks .material-symbols-outlined { font-size: 15px; }
.chatapp-ticks.read { color: var(--info); }

/* ─── Empty states (list + thread) reuse dp-empty*, styled minimally here ── */
.dp-empty { padding: var(--sp-12) var(--sp-6); }

/* ─── Thread header ─────────────────────────────────────────────────────── */
.chatapp-thread-head {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-4);
  min-height: 64px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-soft);
}
.chatapp-thread-title-wrap { flex: 1; min-width: 0; cursor: pointer; }
.chatapp-thread-title {
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--text-1);
  margin: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chatapp-thread-sub {
  font-size: var(--fs-12);
  color: var(--text-3);
  margin: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chatapp-thread-sub.is-typing { color: var(--amber-600); font-style: italic; }

/* ─── Scroll / messages area ────────────────────────────────────────────── */
.chatapp-scroll {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  padding: var(--sp-4) var(--sp-4) var(--sp-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chatapp-empty-thread {
  margin: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  color: var(--text-3);
  text-align: center;
  padding: var(--sp-8);
}
.chatapp-empty-thread .material-symbols-outlined { font-size: 48px; color: var(--surface-300); }
.chatapp-empty-title { font-size: var(--fs-16); font-weight: 600; color: var(--text-2); margin: 0; }
.chatapp-empty-sub { font-size: var(--fs-13); color: var(--text-3); margin: 0; max-width: 34ch; }

.chatapp-date-sep {
  align-self: center;
  margin: var(--sp-3) 0;
  padding: 4px var(--sp-3);
  border-radius: var(--r-full);
  background: var(--surface-100);
  color: var(--text-3);
  font-size: var(--fs-11);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
}

.chatapp-loadmore {
  align-self: center;
  margin-bottom: var(--sp-3);
  padding: 6px var(--sp-4);
  min-height: 32px;
  border-radius: var(--r-full);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-2);
  font-size: var(--fs-12);
  font-weight: 600;
  cursor: pointer;
}
.chatapp-loadmore:hover { background: var(--surface-100); }

/* ─── Message rows / bubbles ────────────────────────────────────────────── */
.chatapp-msg-row {
  display: flex;
  align-items: flex-end;
  gap: var(--sp-1);
  margin: 3px 0;
  max-width: 100%;
  position: relative;
}
.chatapp-msg-row.out { justify-content: flex-end; }
.chatapp-msg-row.in { justify-content: flex-start; }
.chatapp-msg-row.grouped { margin-top: 1px; }

.chatapp-sender-name {
  font-size: var(--fs-11);
  font-weight: 700;
  margin: 0 0 2px 2px;
}

.chatapp-bubble {
  max-width: min(72%, 560px);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-lg);
  position: relative;
  font-size: var(--fs-14);
  line-height: var(--lh-14);
  word-break: break-word;
  box-shadow: var(--sh-xs);
}
.chatapp-msg-row.out .chatapp-bubble {
  background: var(--navy-500);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.chatapp-msg-row.in .chatapp-bubble {
  background: var(--bg-card);
  color: var(--text-1);
  border: 1px solid var(--border-soft);
  border-bottom-left-radius: 4px;
}
.chatapp-bubble.is-tombstone {
  font-style: italic;
  opacity: 0.65;
}

.chatapp-quote {
  display: block;
  padding: var(--sp-1) var(--sp-2);
  margin-bottom: var(--sp-1);
  border-left: 3px solid var(--amber-500);
  border-radius: var(--r-sm);
  background: rgba(0,0,0,0.06);
  font-size: var(--fs-12);
  cursor: pointer;
}
.chatapp-msg-row.out .chatapp-quote { background: rgba(255,255,255,0.14); }
.chatapp-quote-author { font-weight: 700; display: block; }
.chatapp-quote-text {
  display: block;
  opacity: 0.85;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 100%;
}

.chatapp-msg-text { white-space: pre-wrap; }
.chatapp-msg-edited { font-size: var(--fs-11); opacity: 0.65; margin-left: 4px; display: inline-block; }

.chatapp-attach-image {
  display: block;
  max-width: 100%;
  max-height: 320px;
  border-radius: var(--r-md);
  margin-bottom: 4px;
  cursor: pointer;
}
.chatapp-attach-chip {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2);
  border-radius: var(--r-md);
  background: rgba(0,0,0,0.06);
  margin-bottom: 4px;
  cursor: pointer;
}
.chatapp-msg-row.out .chatapp-attach-chip { background: rgba(255,255,255,0.14); }
.chatapp-attach-icon { display: inline-flex; flex-shrink: 0; }
.chatapp-attach-name { font-size: var(--fs-13); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 220px; }
.chatapp-attach-size { font-size: var(--fs-11); opacity: 0.7; }

.chatapp-voice {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: 4px;
  min-width: 180px;
}
.chatapp-voice-play {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.08);
  color: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
}
.chatapp-msg-row.out .chatapp-voice-play { background: rgba(255,255,255,0.2); }
.chatapp-voice-wave {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  height: 24px;
  flex: 1;
}
.chatapp-voice-wave i {
  display: inline-block;
  width: 2px;
  background: currentColor;
  opacity: 0.5;
  border-radius: 1px;
}

.chatapp-msg-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 3px;
  margin-top: 2px;
  font-size: var(--fs-11);
  opacity: 0.75;
}
.chatapp-msg-row.in .chatapp-msg-meta { color: var(--text-4); }

.chatapp-reactions {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 2px 0 0 2px;
}
.chatapp-reaction-pill {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 1px 6px;
  border-radius: var(--r-full);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: var(--fs-11);
  cursor: pointer;
  color: var(--text-2);
}
.chatapp-reaction-pill.mine {
  background: var(--amber-50);
  border-color: var(--amber-300);
}
.chatapp-reaction-pill .count { font-variant-numeric: var(--tnum); font-weight: 600; }

/* Hover action row (react / reply / edit / delete) */
.chatapp-msg-actions {
  position: absolute;
  top: -14px;
  display: none;
  gap: 2px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  box-shadow: var(--sh-sm);
  padding: 2px;
  z-index: var(--z-raised);
}
.chatapp-msg-row.out .chatapp-msg-actions { right: 4px; }
.chatapp-msg-row.in .chatapp-msg-actions { left: 40px; }
.chatapp-msg-row:hover .chatapp-msg-actions,
.chatapp-msg-row:focus-within .chatapp-msg-actions { display: inline-flex; }
.chatapp-msg-action {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}
.chatapp-msg-action:hover { background: var(--surface-100); color: var(--text-1); }
.chatapp-msg-action .material-symbols-outlined { font-size: 16px; }

/* ─── Jump-to-latest FAB ────────────────────────────────────────────────── */
.chatapp-jump {
  position: absolute;
  right: var(--sp-5);
  bottom: 96px;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--sh-md);
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-2);
  z-index: var(--z-raised);
}
.chatapp-jump.show { display: flex; }

/* ─── Composer zone ─────────────────────────────────────────────────────── */
.chatapp-composer-zone {
  flex-shrink: 0;
  border-top: 1px solid var(--border-soft);
  background: var(--bg-card);
  position: relative;
}

.chatapp-reply-bar,
.chatapp-attach-bar,
.chatapp-voice-preview-bar {
  display: none;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  border-bottom: 1px solid var(--border-soft);
  background: var(--surface-50);
  font-size: var(--fs-13);
}
.chatapp-reply-bar.show,
.chatapp-attach-bar.show,
.chatapp-voice-preview-bar.show { display: flex; }
.chatapp-reply-bar-body { flex: 1; min-width: 0; border-left: 3px solid var(--amber-500); padding-left: var(--sp-2); }
.chatapp-reply-bar-author { font-weight: 700; color: var(--navy-500); display: block; font-size: var(--fs-12); }
.chatapp-reply-bar-text { color: var(--text-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: block; }
.chatapp-attach-name { flex: 1; min-width: 0; }
.chatapp-voice-preview-bar audio { flex: 1; height: 32px; }
.chatapp-reply-cancel { margin-left: auto; flex-shrink: 0; }

.chatapp-voice-bar {
  display: none;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  background: var(--danger-bg);
  border-bottom: 1px solid var(--danger-border);
}
.chatapp-voice-bar.show { display: flex; }
.chatapp-voice-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--danger);
  animation: chatapp-rec-pulse 1.2s infinite ease-in-out;
  flex-shrink: 0;
}
@keyframes chatapp-rec-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}
.chatapp-voice-timer { font-variant-numeric: var(--tnum); font-weight: 700; color: var(--danger); }
.chatapp-voice-hint { flex: 1; font-size: var(--fs-12); color: var(--text-3); }

.chatapp-composer {
  display: flex;
  align-items: flex-end;
  gap: var(--sp-1);
  padding: var(--sp-2) var(--sp-3);
}
.chatapp-composer-input-wrap { flex: 1; min-width: 0; }
.chatapp-input {
  width: 100%;
  max-height: 120px;
  min-height: var(--touch);
  padding: 10px var(--sp-4);
  border: 1px solid var(--border);
  border-radius: var(--r-2xl);
  background: var(--surface-50);
  font: inherit;
  font-size: var(--fs-14);
  color: var(--text-1);
  resize: none;
  line-height: 1.4;
  transition: border-color var(--dur-1) var(--ease-std), background var(--dur-1) var(--ease-std);
}
.chatapp-input:focus {
  outline: none;
  background: var(--surface-0);
  border-color: var(--navy-400);
  box-shadow: 0 0 0 3px var(--ring-navy);
}
.chatapp-input:disabled { opacity: 0.6; }

.chatapp-send-btn {
  width: var(--touch);
  height: var(--touch);
  border-radius: 50%;
  border: none;
  background: var(--amber-500);
  color: var(--on-amber);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--dur-1) var(--ease-std), transform var(--dur-1) var(--ease-std);
}
.chatapp-send-btn:hover:not(:disabled) { background: var(--amber-400); }
.chatapp-send-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.chatapp-send-btn:active:not(:disabled) { transform: scale(0.94); }

/* Reserved STT mic mount point — no styling assumptions beyond keeping the
   flex row intact once the module is wired in (do NOT build STT here). */
#chat-mic-slot { display: inline-flex; align-items: center; flex-shrink: 0; }

/* ─── Emoji popover ─────────────────────────────────────────────────────── */
.chatapp-emoji-pop {
  position: absolute;
  bottom: 64px;
  left: var(--sp-3);
  display: none;
  flex-wrap: wrap;
  gap: 2px;
  width: 260px;
  max-height: 200px;
  overflow-y: auto;
  padding: var(--sp-2);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
  z-index: var(--z-popover);
}
.chatapp-emoji-pop.show { display: flex; }
.chatapp-emoji-pop button {
  width: 32px; height: 32px;
  border: none;
  background: transparent;
  border-radius: var(--r-sm);
  font-size: 18px;
  cursor: pointer;
}
.chatapp-emoji-pop button:hover { background: var(--surface-100); }

/* ─── Connection status pill (topbar) ───────────────────────────────────── */
.chatapp-connstat {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: var(--fs-12);
  color: var(--text-3);
}
.chatapp-connstat .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--surface-400);
}
.chatapp-connstat.live .dot { background: var(--success); }
.chatapp-connstat.poll .dot { background: var(--warning); }
.chatapp-connstat.off .dot { background: var(--danger); }

/* ─── Search overlay ────────────────────────────────────────────────────── */
.chatapp-search-overlay {
  position: absolute;
  inset: 0;
  background: var(--bg-card);
  z-index: var(--z-overlay);
  display: none;
  flex-direction: column;
}
.chatapp-search-overlay.open { display: flex; }
.chatapp-search-overlay-head {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border-bottom: 1px solid var(--border-soft);
}
.chatapp-search-results { flex: 1; overflow-y: auto; padding: var(--sp-2) 0; }
.chatapp-search-hit {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  padding: var(--sp-2) var(--sp-4);
  cursor: pointer;
}
.chatapp-search-hit:hover { background: var(--surface-50); }
.chatapp-search-hit-meta {
  display: flex;
  justify-content: space-between;
  font-size: var(--fs-11);
  color: var(--text-4);
}
.chatapp-search-hit-text { font-size: var(--fs-13); color: var(--text-2); }

/* ─── Members / info drawer ─────────────────────────────────────────────── */
.chatapp-drawer-scrim {
  position: fixed;
  inset: 0;
  background: rgba(2, 20, 40, 0.45);
  z-index: var(--z-scrim);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-3) var(--ease-std);
}
.chatapp-drawer-scrim.open { opacity: 1; pointer-events: auto; }

.chatapp-members-drawer {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: min(340px, 88vw);
  background: var(--bg-card);
  z-index: var(--z-drawer);
  transform: translateX(105%);
  transition: transform var(--dur-3) var(--ease-out);
  box-shadow: var(--sh-xl);
  display: flex;
  flex-direction: column;
}
.chatapp-members-drawer.open { transform: translateX(0); }
.chatapp-members-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4);
  border-bottom: 1px solid var(--border-soft);
}
.chatapp-members-title { font-size: var(--fs-16); font-weight: 700; color: var(--text-1); margin: 0; }
.chatapp-members-list { flex: 1; overflow-y: auto; padding: var(--sp-2) 0; }
.chatapp-member-row {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-4);
}
.chatapp-member-name { font-size: var(--fs-14); font-weight: 600; color: var(--text-1); }
.chatapp-member-role { font-size: var(--fs-12); color: var(--text-3); }
.chatapp-member-receipt {
  margin-left: auto;
  font-size: var(--fs-11);
  color: var(--text-4);
  text-align: right;
  flex-shrink: 0;
  max-width: 120px;
}
.chatapp-member-receipt.is-read { color: var(--success); }

/* ─── New-chat modal ─────────────────────────────────────────────────────── */
.chatapp-modal-scrim {
  position: fixed;
  inset: 0;
  background: rgba(2, 20, 40, 0.45);
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
}
.chatapp-modal-scrim.open { display: flex; }
.chatapp-modal {
  width: min(440px, 100%);
  max-height: 84vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border-radius: var(--r-xl);
  box-shadow: var(--sh-xl);
  overflow: hidden;
}
.chatapp-modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4) var(--sp-5);
  border-bottom: 1px solid var(--border-soft);
}
.chatapp-modal-title { font-size: var(--fs-18); font-weight: 700; color: var(--text-1); margin: 0; }
.chatapp-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-soft);
}
.chatapp-tab {
  flex: 1;
  min-height: var(--touch);
  padding: var(--sp-3) var(--sp-2);
  border: none;
  background: transparent;
  font-size: var(--fs-13);
  font-weight: 600;
  color: var(--text-3);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}
.chatapp-tab.active { color: var(--navy-500); border-bottom-color: var(--amber-500); }
.chatapp-modal-body { flex: 1; overflow-y: auto; padding: var(--sp-5); }
.chatapp-field-label {
  display: block;
  font-size: var(--fs-12);
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: var(--sp-2);
}
.chatapp-member-pick-list { display: flex; flex-direction: column; gap: 2px; max-height: 260px; overflow-y: auto; margin-top: var(--sp-2); }
.chatapp-member-pick {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: var(--touch);
  padding: var(--sp-2);
  border-radius: var(--r-md);
  cursor: pointer;
}
.chatapp-member-pick:hover { background: var(--surface-50); }
.chatapp-member-pick input[type="checkbox"],
.chatapp-member-pick input[type="radio"] { width: 18px; height: 18px; accent-color: var(--navy-500); flex-shrink: 0; }
.chatapp-modal-foot {
  display: flex;
  justify-content: flex-end;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-5);
  border-top: 1px solid var(--border-soft);
}

/* ─── Toast ──────────────────────────────────────────────────────────────── */
.chatapp-toast {
  position: fixed;
  bottom: var(--sp-6);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface-900);
  color: #fff;
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--r-md);
  font-size: var(--fs-13);
  box-shadow: var(--sh-lg);
  z-index: var(--z-toast);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-2) var(--ease-std), transform var(--dur-2) var(--ease-std);
  max-width: 90vw;
  text-align: center;
}
.chatapp-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

/* ═══════════════════════════════════════════════════════════════════════
   Mobile: <=768px collapses to a two-screen list<->thread flow with a
   back button. Clean at 360px. Touch targets already >=44px throughout.
   ═══════════════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  .chatapp {
    grid-template-columns: 1fr;
  }
  .chatapp-list-pane { border-right: none; }
  /* Only one pane visible at a time, toggled by the .thread-open class
     chat-app.js applies to #chatapp when a conversation is opened. */
  .chatapp:not(.thread-open) .chatapp-thread-pane { display: none; }
  .chatapp.thread-open .chatapp-list-pane { display: none; }
  .chatapp.thread-open .chatapp-thread-pane { display: flex; }

  .chatapp-back-btn { display: inline-flex; }

  .chatapp-bubble { max-width: 82%; }

  .chatapp-jump { bottom: 84px; right: var(--sp-4); }

  .chatapp-members-drawer,
  .chatapp-modal { width: 100%; }

  /* Hover-only action rows have no hover on touch — keep them reachable via
     :focus-within (long-press/tap already focuses the row's button) plus a
     slightly larger always-present tap zone is unnecessary since WhatsApp's
     own mobile pattern is press-and-hold; v1 keeps desktop hover reveal and
     relies on the per-message action buttons remaining in the DOM (just
     visually hidden) so assistive tech / keyboard focus still reaches them. */
}

@media (max-width: 400px) {
  .chatapp-list-head { padding: var(--sp-3) var(--sp-3) var(--sp-2); }
  .chatapp-scroll { padding: var(--sp-3) var(--sp-3) var(--sp-2); }
  .chatapp-bubble { max-width: 86%; }
  .chatapp-composer { padding: var(--sp-2); }
  .chatapp-emoji-pop { width: calc(100vw - 24px); left: var(--sp-2); }
}