:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --panel-2: #f9fafb;
  --text: #1c2024;
  --muted: #687076;
  --border: #e3e5e8;
  --accent: #128c7e;
  --accent-text: #ffffff;
  --accent-soft: #e3f4f1;
  --bubble-in: #ffffff;
  --bubble-out: #d9fdd3;
  --bubble-bot: #eef1f4;
  --chat-bg: #efeae2;
  --danger: #c62828;
  --warn-bg: #fff6e0;
  --warn-text: #7a5300;
  --tick-read: #34b7f1;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 1px 8px rgba(0, 0, 0, 0.04);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1215;
    --panel: #171b1f;
    --panel-2: #1d2226;
    --text: #e6e8ea;
    --muted: #9aa2a8;
    --border: #2a3036;
    --accent: #25a891;
    --accent-text: #04120f;
    --accent-soft: #143a33;
    --bubble-in: #1f262b;
    --bubble-out: #144d37;
    --bubble-bot: #242b31;
    --chat-bg: #0b141a;
    --danger: #ff6b6b;
    --warn-bg: #3a2f12;
    --warn-text: #f3d48b;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h1 { font-size: 20px; margin: 0 0 4px; }
h2 { font-size: 15px; margin: 0 0 12px; }
.mt { margin-top: 24px; }
code { background: var(--panel-2); border: 1px solid var(--border); border-radius: 4px; padding: 0 4px; font-size: 12px; }
.muted { color: var(--muted); }
.hint { color: var(--muted); font-size: 12px; margin: 6px 0 12px; }
.error { color: var(--danger); min-height: 1em; margin: 6px 0 0; }
.note { background: var(--warn-bg); color: var(--warn-text); padding: 10px 12px; border-radius: 8px; margin-bottom: 12px; }

input, select, textarea {
  font: inherit; color: inherit; background: var(--panel);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
input[type="checkbox"] { width: auto; accent-color: var(--accent); }
label { display: block; margin: 10px 0 4px; font-weight: 500; }
label > input, label > select, label > textarea, label > .row { margin-top: 4px; font-weight: 400; }
label.check { display: flex; gap: 8px; align-items: center; font-weight: 400; }

.btn {
  font: inherit; cursor: pointer; border-radius: 8px; padding: 8px 14px;
  border: 1px solid var(--border); background: var(--panel); color: var(--text); white-space: nowrap;
}
.btn:hover { background: var(--panel-2); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.05); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.small { padding: 5px 10px; font-size: 13px; }
.btn.danger { color: var(--danger); }

.row { display: flex; gap: 8px; align-items: center; }
.row.between { justify-content: space-between; }
.row.end { justify-content: flex-end; margin-top: 16px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 16px; box-shadow: var(--shadow); min-width: 0; }

/* login */
.login { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.login-card { width: min(360px, 100%); display: grid; gap: 10px; }

#app { height: 100%; display: flex; flex-direction: column; }

/* top bar */
.topbar {
  display: flex; align-items: center; gap: 16px; padding: 0 16px; height: 52px;
  background: var(--panel); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; gap: 6px; align-items: center; white-space: nowrap; }
.tabs { display: flex; gap: 2px; flex: 1; overflow-x: auto; }
.tab {
  font: inherit; background: none; border: 0; color: var(--muted); padding: 15px 12px;
  cursor: pointer; border-bottom: 2px solid transparent; white-space: nowrap;
}
.tab.on { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 8px; }
.live { color: var(--muted); font-size: 10px; }
.live.on { color: #22c55e; }
.badge { background: var(--accent); color: var(--accent-text); border-radius: 999px; padding: 0 6px; font-size: 11px; font-weight: 700; margin-left: 2px; }

.view { flex: 1; min-height: 0; }
.view.pad { padding: 16px; overflow: auto; }
.cols { display: grid; grid-template-columns: minmax(300px, 420px) 1fr; gap: 16px; align-items: start; max-width: 1400px; margin: 0 auto; }
.cols.wide-right { grid-template-columns: minmax(260px, 340px) 1fr; }

/* inbox */
.inbox { display: grid; grid-template-columns: 340px 1fr; grid-template-rows: minmax(0, 1fr); overflow: hidden; }
.conv-pane { border-right: 1px solid var(--border); background: var(--panel); display: flex; flex-direction: column; min-height: 0; }
.conv-tools { padding: 10px; display: grid; gap: 8px; border-bottom: 1px solid var(--border); }
.seg { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg button { flex: 1; font: inherit; font-size: 13px; padding: 5px; border: 0; background: none; color: var(--muted); cursor: pointer; }
.seg button.on { background: var(--accent-soft); color: var(--text); font-weight: 600; }
.conv-list { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; }
.conv {
  padding: 10px 12px; border-bottom: 1px solid var(--border); cursor: pointer; display: grid;
  grid-template-columns: 38px 1fr auto; gap: 10px; align-items: center;
}
.conv:hover { background: var(--panel-2); }
.conv.sel { background: var(--accent-soft); }
.avatar {
  width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center;
  background: var(--bubble-bot); color: var(--muted); font-weight: 700; font-size: 14px;
}
.conv .top { display: flex; justify-content: space-between; gap: 8px; }
.conv .name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv .time { color: var(--muted); font-size: 12px; white-space: nowrap; }
.conv .last { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.conv.unread .name, .conv.unread .last { color: var(--text); font-weight: 700; }
.conv .flags { display: flex; flex-direction: column; gap: 4px; align-items: flex-end; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); }
.pill { font-size: 11px; padding: 1px 8px; border-radius: 999px; background: var(--bubble-bot); color: var(--muted); white-space: nowrap; }
.pill.human { background: var(--warn-bg); color: var(--warn-text); }
.pill.ok { background: var(--accent-soft); color: var(--text); }
.pill.bad { background: transparent; border: 1px solid var(--danger); color: var(--danger); }

.thread-pane { min-height: 0; display: flex; flex-direction: column; background: var(--chat-bg); }
.empty { margin: auto; color: var(--muted); }
.thread { display: flex; flex-direction: column; min-height: 0; flex: 1; }
.thread-head {
  display: flex; align-items: center; gap: 10px; padding: 8px 14px; background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.thread-head .who { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.thread-head .who strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.thread-actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.back { display: none; }
.messages { flex: 1; overflow-y: auto; padding: 16px 6%; display: flex; flex-direction: column; gap: 4px; }
.day { align-self: center; font-size: 12px; color: var(--muted); background: var(--panel); padding: 2px 10px; border-radius: 8px; margin: 10px 0 6px; }
.bubble {
  max-width: min(560px, 85%); padding: 6px 10px 4px; border-radius: 8px; background: var(--bubble-in);
  box-shadow: var(--shadow); white-space: pre-wrap; overflow-wrap: anywhere; align-self: flex-start;
}
.bubble.out { align-self: flex-end; background: var(--bubble-out); }
.bubble.out.bot, .bubble.out.notify { background: var(--bubble-bot); }
.bubble.failed { outline: 1px solid var(--danger); }
.bubble .meta { display: flex; gap: 6px; justify-content: flex-end; align-items: center; font-size: 11px; color: var(--muted); margin-top: 2px; }
.bubble .who-tag { font-size: 11px; font-weight: 600; color: var(--accent); display: block; margin-bottom: 2px; }
.bubble a { color: inherit; }
.bubble .err { color: var(--danger); font-size: 12px; display: block; }
.tick.read { color: var(--tick-read); }
.bubble.preview { align-self: stretch; max-width: none; background: var(--bubble-out); margin: 8px 0; }

.reply { display: flex; gap: 8px; padding: 10px 14px; background: var(--panel); border-top: 1px solid var(--border); align-items: flex-end; }
.reply textarea { resize: none; max-height: 160px; }
.reply-closed { padding: 12px 14px; background: var(--warn-bg); color: var(--warn-text); display: flex; gap: 10px; align-items: center; justify-content: space-between; flex-wrap: wrap; }

/* broadcasts */
.composer .row select { flex: 1; }
.checks { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-bottom: 4px; }
.checks label { margin: 0; font-weight: 400; display: flex; gap: 6px; align-items: center; }
#bc-count { margin: 10px 0; min-height: 1.4em; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(90px, 1fr)); gap: 8px; margin: 10px 0 14px; }
.stat { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; }
.stat b { display: block; font-size: 20px; }
.stat span { color: var(--muted); font-size: 12px; }

/* tables */
.table-wrap { overflow-x: auto; margin-top: 10px; }
.table { width: 100%; border-collapse: collapse; }
.table th { text-align: left; font-weight: 600; color: var(--muted); font-size: 12px; padding: 8px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.table td { padding: 8px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table tr.click { cursor: pointer; }
.table tr.click:hover td { background: var(--panel-2); }
.table td.num { font-variant-numeric: tabular-nums; }

.group-list { list-style: none; padding: 0; margin: 0 0 10px; }
.group-list li { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 6px 0; border-bottom: 1px solid var(--border); }
.group-list li span { overflow: hidden; text-overflow: ellipsis; }

/* modal + toast */
.modal { border: 1px solid var(--border); border-radius: 12px; padding: 20px; background: var(--panel); color: var(--text); width: min(560px, calc(100% - 32px)); max-height: calc(100% - 32px); }
.modal::backdrop { background: rgba(0, 0, 0, 0.4); }
.modal.wide { width: min(900px, calc(100% - 32px)); }
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg);
  padding: 10px 16px; border-radius: 8px; z-index: 20; max-width: calc(100% - 32px);
}

/* phones */
@media (max-width: 860px) {
  .cols, .cols.wide-right { grid-template-columns: 1fr; }
  .inbox { grid-template-columns: 1fr; }
  .inbox.show-thread .conv-pane { display: none; }
  .inbox:not(.show-thread) .thread-pane { display: none; }
  .back { display: inline-block; }
  .messages { padding: 12px; }
  .topbar { gap: 8px; padding: 0 8px; }
  .brand strong { display: none; }
  .view.pad { padding: 12px; }
}