:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --text: #1c2430;
  --muted: #6b7684;
  --line: #e2e6eb;
  --accent: #1f7a6d;
  --accent-soft: #e3f2ef;
  --client: #ffffff;
  --out: #e3f2ef;
  --bot: #f1f3f6;
  --warn: #b25b00;
  --danger: #b3261e;
  --urgent: #c62828;
  --radius: 10px;
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161b;
    --panel: #1a2027;
    --text: #e6e9ed;
    --muted: #97a1ad;
    --line: #2a323c;
    --accent: #4cb3a3;
    --accent-soft: #1d3a36;
    --client: #1f262e;
    --out: #1d3a36;
    --bot: #232a33;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
[hidden] { display: none !important; }
button { font: inherit; cursor: pointer; border: 1px solid var(--line); background: var(--panel); color: var(--text);
  border-radius: 8px; padding: 6px 12px; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.link { border: 0; background: none; color: var(--accent); padding: 0 4px; }
button:disabled { opacity: .5; cursor: default; }
input, select, textarea { font: inherit; color: var(--text); background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: 7px 10px; }
.muted { color: var(--muted); }
.error { color: var(--danger); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
.pill { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 999px; background: var(--accent-soft);
  color: var(--accent); white-space: nowrap; }
.pill.ghost { background: transparent; border: 1px solid var(--line); color: var(--muted); }
.pill.lead { background: #fff1e0; color: var(--warn); }
.pill.urgent { background: #fde7e7; color: var(--urgent); }
@media (prefers-color-scheme: dark) { .pill.lead { background: #3a2a14; } .pill.urgent { background: #3d1c1c; } }

/* login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: min(380px, 100%); padding: 28px; display: grid; gap: 12px; }
.login-card h1 { margin: 0; }
.login-card label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); }
.demo-hint ul { padding-left: 18px; margin: 6px 0 0; }

/* app shell */
.app { height: 100vh; display: flex; flex-direction: column; }
.topbar { display: flex; align-items: center; gap: 16px; padding: 10px 16px; background: var(--panel);
  border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; white-space: nowrap; }
.brand .muted { font-weight: 400; margin-left: 6px; }
.me { margin-left: auto; white-space: nowrap; }
.funnel { display: flex; gap: 4px; align-items: center; font-size: 12px; color: var(--muted); overflow-x: auto; }
.funnel b { color: var(--text); font-size: 14px; }
.funnel .arrow { opacity: .5; }
.layout { flex: 1; display: grid; grid-template-columns: 360px minmax(0, 1fr); min-height: 0; }

/* sidebar */
.sidebar { border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; min-width: 0;
  background: var(--panel); }
.tabs { display: flex; border-bottom: 1px solid var(--line); }
.tab { flex: 1; border: 0; border-radius: 0; background: none; padding: 10px 6px; font-size: 13px; color: var(--muted);
  border-bottom: 2px solid transparent; }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.filters { display: flex; gap: 8px; padding: 8px 12px; align-items: center; border-bottom: 1px solid var(--line); }
.check { display: flex; gap: 4px; align-items: center; font-size: 13px; }
.conv-list { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; }
.conv { padding: 10px 12px; border-bottom: 1px solid var(--line); cursor: pointer; display: grid; gap: 3px; min-width: 0; }
.conv:hover { background: var(--bg); }
.conv.active { background: var(--accent-soft); }
.conv .row { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; min-width: 0; }
.conv .name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv .time { margin-left: auto; font-size: 12px; color: var(--muted); white-space: nowrap; }
.conv .name { min-width: 0; flex: 0 1 auto; }
.conv .preview { font-size: 13px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.empty { padding: 16px; }

/* thread */
.thread { display: flex; flex-direction: column; min-height: 0; }
#thread-view { display: flex; flex-direction: column; min-height: 0; height: 100%; }
.empty-state { margin: auto; }
.thread-head { display: flex; gap: 12px; align-items: flex-start; justify-content: space-between; padding: 12px 16px;
  background: var(--panel); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.thread-head h2 { margin: 0 0 4px; font-size: 18px; }
.meta-row { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; font-size: 13px; }
.actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.actions select { padding: 5px 8px; }
.request-card, .history { margin: 10px 16px 0; padding: 10px 12px; border-radius: var(--radius); background: var(--panel);
  border: 1px solid var(--line); font-size: 13px; display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.request-card .desc { flex-basis: 100%; font-size: 14px; white-space: pre-wrap; }
.history { color: var(--muted); }
.booking { margin: 10px 16px 0; padding: 12px; display: grid; gap: 10px; }
.booking .row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.slots { display: flex; gap: 6px; flex-wrap: wrap; }
.slots button.selected { background: var(--accent); color: #fff; }
.messages { list-style: none; margin: 0; padding: 12px 16px; overflow-y: auto; flex: 1; display: flex; flex-direction: column;
  gap: 8px; }
.msg { max-width: min(640px, 85%); padding: 8px 12px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--client); align-self: flex-start; }
.msg.out { align-self: flex-end; background: var(--out); border-color: transparent; }
.msg.bot { background: var(--bot); border-color: transparent; }
.msg .who { font-size: 12px; color: var(--muted); margin-bottom: 2px; display: flex; gap: 8px; }
.msg .text { white-space: pre-wrap; overflow-wrap: anywhere; }
.msg .buttons { margin-top: 6px; display: flex; gap: 4px; flex-wrap: wrap; }
.msg .buttons span { font-size: 12px; border: 1px dashed var(--line); border-radius: 999px; padding: 1px 8px; color: var(--muted); }
.msg .photos { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.msg .photos img { width: 140px; height: 105px; object-fit: cover; border-radius: 8px; cursor: zoom-in; border: 1px solid var(--line); }
.msg .status { font-size: 11px; color: var(--muted); }
.msg .status.failed { color: var(--danger); }
.reply { display: flex; gap: 8px; padding: 10px 16px; border-top: 1px solid var(--line); background: var(--panel); }
.reply textarea { flex: 1; resize: vertical; min-height: 44px; }
dialog { border: 0; border-radius: var(--radius); padding: 8px; background: var(--panel); max-width: 95vw; }
dialog img { max-width: 90vw; max-height: 80vh; display: block; }
dialog form { text-align: right; margin-top: 6px; }
.toast { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg);
  padding: 8px 16px; border-radius: 8px; z-index: 10; max-width: calc(100vw - 32px); }

.back { display: none; }
@media (max-width: 800px) {
  .back { display: inline-block; }
  .layout { grid-template-columns: minmax(0, 1fr); }
  .app.has-thread .sidebar { display: none; }
  .app:not(.has-thread) .thread { display: none; }
  .funnel { display: none; }
  .topbar { flex-wrap: wrap; }
}

/* team / invites (§5a) */
.team { width: min(640px, 96vw); max-height: 90vh; overflow-y: auto; }
.team-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.team h4 { margin: 14px 0 6px; font-size: 13px; color: var(--muted); }
.team-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.team-list li { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; padding: 8px; border: 1px solid var(--line);
  border-radius: 8px; }
.team-list li .grow { flex: 1; min-width: 0; }
.team-manual { display: flex; gap: 6px; flex-wrap: wrap; }
.team-manual input { flex: 1; min-width: 140px; }
.team-msg { display: grid; gap: 6px; margin-top: 8px; }
.team-msg textarea { width: 100%; font-size: 13px; }