:root {
  --bg: #f4f5f7; --card: #ffffff; --text: #1d2129; --muted: #6b7280; --line: #e5e7eb;
  --accent: #2563eb; --accent-text: #ffffff; --ok: #15803d; --warn: #b45309; --bad: #b91c1c;
  --ok-bg: #dcfce7; --warn-bg: #fef3c7; --bad-bg: #fee2e2; --idle-bg: #eef2f7;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317; --card: #1b1e24; --text: #e8eaed; --muted: #9aa1ab; --line: #2b2f37;
    --accent: #4f8cff; --accent-text: #0b1020; --ok: #4ade80; --warn: #fbbf24; --bad: #f87171;
    --ok-bg: #12301f; --warn-bg: #3a2b0c; --bad-bg: #3b1515; --idle-bg: #252a33;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh; display: flex; flex-direction: column;
}
main { flex: 1 0 auto; width: 100%; }
[hidden] { display: none !important; }
.bar {
  position: sticky; top: 0; z-index: 2; display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line);
}
.bar h1 { flex: 1; margin: 0; font-size: 17px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
main { padding: 12px 16px 24px; max-width: 760px; margin: 0 auto; }
.composer { margin-top: auto; }
h2 { font-size: 13px; color: var(--muted); font-weight: 600; margin: 16px 0 8px; }
button { font: inherit; border: 0; border-radius: 8px; padding: 8px 14px; cursor: pointer; background: var(--idle-bg); color: var(--text); }
button:disabled { opacity: .5; cursor: default; }
.primary { background: var(--accent); color: var(--accent-text); font-weight: 600; }
.danger { background: var(--bad-bg); color: var(--bad); font-weight: 600; }
.link { background: none; color: var(--accent); padding: 4px 0; }
.icon { background: none; font-size: 26px; line-height: 1; padding: 0 6px; }
.muted { color: var(--muted); font-size: 13px; }
.center { text-align: center; }
.error { color: var(--bad); font-size: 13px; margin: 6px 0 0; }
.notice { background: var(--warn-bg); color: var(--warn); padding: 8px 12px; border-radius: 8px; font-size: 13px; }
.gate { text-align: center; padding-top: 25vh; }
.pill, .badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; white-space: nowrap; background: var(--idle-bg); color: var(--muted); }
.ok { background: var(--ok-bg); color: var(--ok); }
.warn { background: var(--warn-bg); color: var(--warn); }
.bad { background: var(--bad-bg); color: var(--bad); }
.cards, .list, .receipts, .messages { list-style: none; margin: 0; padding: 0; }
.cards li {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin-bottom: 10px; cursor: pointer;
}
.cards .top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.cards .name { font-weight: 600; }
.cards .snippet { margin: 6px 0 0; color: var(--muted); font-size: 13px; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.cards .meta { margin-top: 6px; font-size: 12px; color: var(--muted); }
.list li { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; font-size: 13px; }
.list .row { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.list .detail { color: var(--muted); margin-top: 4px; }
.info { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.info .row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.receipts li { font-size: 13px; color: var(--muted); padding: 2px 0; }
.messages li { margin-bottom: 10px; display: flex; flex-direction: column; }
.messages .bubble { padding: 8px 12px; border-radius: 12px; max-width: 88%; white-space: pre-wrap; word-break: break-word; background: var(--card); border: 1px solid var(--line); }
.messages .user { align-items: flex-end; }
.messages .user .bubble { background: var(--accent); color: var(--accent-text); border-color: transparent; }
.messages .system .bubble { background: var(--warn-bg); color: var(--warn); border-color: transparent; font-size: 13px; }
.messages .time { font-size: 11px; color: var(--muted); margin-top: 2px; }
.composer {
  position: sticky; bottom: 0; background: var(--card); border-top: 1px solid var(--line);
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
}
.composer > * { max-width: 728px; margin-left: auto; margin-right: auto; }
.modes { display: flex; gap: 6px; }
.modes button { flex: 1; padding: 6px; }
.modes button[aria-checked="true"] { background: var(--accent); color: var(--accent-text); font-weight: 600; }
.hint { font-size: 12px; color: var(--muted); margin: 6px auto; }
textarea { display: block; width: 100%; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; resize: vertical; }
.actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }
dialog { width: min(92vw, 720px); max-height: 85vh; border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: var(--text); padding: 12px 16px; }
dialog::backdrop { background: rgba(0, 0, 0, .45); }
dialog .close { float: right; }
dialog pre { white-space: pre-wrap; word-break: break-word; font-size: 12px; max-height: 70vh; overflow: auto; }

.list li.alert-open { border-left: 4px solid var(--bad); }
.list li.alert-resolved { opacity: .75; }
.list li.focus { outline: 2px solid var(--accent); }