:root {
  --bg: #f5f6f8; --surface: #fff; --text: #1b1f24; --muted: #6b7280; --border: #e3e6ea;
  --primary: #2f6fed; --primary-text: #fff; --danger: #d64545; --in: #fff; --out: #e7f0ff;
  --note: #fff6d5; --badge-open: #e3f6e8; --badge-open-text: #1d7a3a; --badge-closed: #fde8e8; --badge-closed-text: #a12b2b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418; --surface: #1a1e24; --text: #e6e8eb; --muted: #9aa3ad; --border: #2a3038;
    --primary: #4b83f5; --in: #1f242b; --out: #1d2c46; --note: #3a3320;
    --badge-open: #173424; --badge-open-text: #7fd39a; --badge-closed: #3d1f1f; --badge-closed-text: #f19a9a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--primary); text-decoration: none; }
main { max-width: 860px; margin: 0 auto; padding: 16px 16px 140px; }
h1 { font-size: 20px; margin: 4px 0; }
code { background: var(--border); padding: 1px 5px; border-radius: 4px; }
.muted { color: var(--muted); }
.error { color: var(--danger); }
.right { margin-left: auto; font-size: 13px; }

.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px; padding: 10px 16px;
  background: var(--surface); border-bottom: 1px solid var(--border); }
.brand { font-weight: 600; color: var(--text); }
.who { margin-left: auto; display: flex; gap: 10px; align-items: center; font-size: 14px; color: var(--muted); }
.who form { margin: 0; }

.btn { display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-size: 14px; cursor: pointer; }
.btn:disabled { opacity: .6; cursor: default; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn.danger { color: var(--danger); }
.btn.ghost { background: transparent; }
.btn.wide { width: 100%; justify-content: center; padding: 10px; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.card.narrow { max-width: 420px; margin: 48px auto; }

.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px; }
.tabs { display: flex; gap: 4px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 3px; }
.tab { border: 0; background: none; padding: 6px 12px; border-radius: 7px; font: inherit; color: var(--muted); cursor: pointer; }
.tab.active { background: var(--primary); color: var(--primary-text); }
#q { flex: 1; min-width: 200px; padding: 8px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit; }

.list { list-style: none; margin: 0; padding: 0; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.list li + li { border-top: 1px solid var(--border); }
.list .empty, .list > .muted { padding: 16px; }
.item { display: block; padding: 12px 14px; color: var(--text); }
.item:hover { background: var(--bg); }
.l1 { display: flex; align-items: center; gap: 8px; }
.l2 { font-size: 13px; margin-top: 2px; }
.unread { background: var(--primary); color: var(--primary-text); border-radius: 10px; font-size: 12px; padding: 0 7px; }
.badge { font-size: 12px; padding: 1px 7px; border-radius: 8px; margin-left: 4px; }
.badge.open { background: var(--badge-open); color: var(--badge-open-text); }
.badge.closed { background: var(--badge-closed); color: var(--badge-closed-text); }

.thead { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: flex-end; margin-bottom: 12px; }
.thead p { margin: 2px 0 0; font-size: 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 6px; }
.grants { margin-bottom: 12px; padding: 10px 14px; }
.grants summary { cursor: pointer; }
.grants .row { display: flex; gap: 8px; align-items: center; padding: 4px 0; }

.chat { display: flex; flex-direction: column; gap: 8px; }
.msg { max-width: 80%; padding: 8px 12px; border-radius: 12px; background: var(--in); border: 1px solid var(--border); overflow-wrap: anywhere; }
.msg.in { align-self: flex-start; }
.msg.out { align-self: flex-end; background: var(--out); }
.msg.note { align-self: center; background: var(--note); }
.msg.system { align-self: center; background: none; border: 0; color: var(--muted); font-size: 13px; }
.msg .meta { font-size: 12px; color: var(--muted); margin-bottom: 3px; }
.msg img, .msg video { max-width: 100%; max-height: 360px; border-radius: 8px; display: block; margin: 4px 0; }
.msg audio { width: 260px; max-width: 100%; }
.msg pre { white-space: pre-wrap; margin: 4px 0; }
.msg blockquote { margin: 4px 0; padding-left: 8px; border-left: 3px solid var(--primary); }
.spoiler { background: var(--muted); color: transparent; border-radius: 3px; }
.spoiler:hover { color: inherit; background: none; }

.composer { position: fixed; left: 0; right: 0; bottom: 0; background: var(--surface); border-top: 1px solid var(--border); padding: 10px 16px; }
.composer textarea { display: block; width: 100%; max-width: 828px; margin: 0 auto; resize: vertical; min-height: 44px; padding: 8px 10px;
  border-radius: 10px; border: 1px solid var(--border); background: var(--bg); color: var(--text); font: inherit; }
.composer-row { display: flex; justify-content: space-between; max-width: 828px; margin: 8px auto 0; }
.file { cursor: pointer; }

@media (max-width: 600px) { .msg { max-width: 92%; } .thead { align-items: flex-start; } }