:root {
  --bg: #f4f6f8; --panel: #ffffff; --panel-2: #eef2f5; --text: #0f172a; --muted: #5b6b7f; --line: #dde3ea;
  --accent: #0f766e; --accent-ink: #ffffff; --accent-soft: #ccfbf1;
  --in: #ffffff; --out: #d1fae5; --urgent: #b91c1c; --urgent-soft: #fee2e2; --warn: #92400e; --warn-soft: #fef3c7;
  --radius: 14px; --shadow: 0 8px 30px rgba(15, 23, 42, .12);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220; --panel: #111a2b; --panel-2: #172238; --text: #e6edf5; --muted: #93a3b8; --line: #22304a;
    --accent: #14b8a6; --accent-ink: #042f2e; --accent-soft: #134e4a;
    --in: #172238; --out: #134e4a; --urgent: #f87171; --urgent-soft: #3b1111; --warn: #fbbf24; --warn-soft: #3a2a07;
    --shadow: 0 8px 30px rgba(0, 0, 0, .5);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; -webkit-text-size-adjust: 100%; }
body { overscroll-behavior: none; }
#app { height: 100dvh; }
h1 { font-size: 1.6rem; margin: .2em 0 .4em; }
h2 { font-size: 1.2rem; margin: 0 0 .8em; }
h3 { font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 1.2em 0 .5em; }
.list h3 { padding: 0 16px; }
p { margin: .5em 0; }
code { font: .85em ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--panel-2); padding: 2px 5px; border-radius: 6px; word-break: break-all; }
.muted { color: var(--muted); font-size: .92rem; }
.pad { padding: 0 16px; }
.center-text { text-align: center; }
.error { color: var(--urgent); min-height: 1.2em; font-size: .92rem; }
.row { display: flex; gap: 8px; flex-wrap: wrap; }

button { font: inherit; border: 1px solid var(--line); background: var(--panel); color: var(--text); padding: 10px 14px;
  border-radius: 10px; cursor: pointer; min-height: 44px; }
button:hover { border-color: var(--accent); }
button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.danger { color: var(--urgent); border-color: var(--urgent); background: transparent; }
button.wide { width: 100%; }
button.icon { border: none; background: transparent; font-size: 1.25rem; padding: 8px; min-width: 44px; }
button:disabled { opacity: .5; cursor: default; }
input, textarea { font: inherit; width: 100%; padding: 11px 12px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel); color: var(--text); }
label { display: block; font-size: .9rem; color: var(--muted); margin: 12px 0; }
label input { margin-top: 6px; color: var(--text); }

.center { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 28px 24px; width: min(440px, 100%); box-shadow: var(--shadow); }
.welcome { text-align: left; }
.logo { font-size: 2.6rem; }
.divider { text-align: center; color: var(--muted); margin: 16px 0; font-size: .9rem; }
.notice { font-size: .82rem; color: var(--muted); border-top: 1px solid var(--line); padding-top: 12px; margin-top: 18px; }
.bigcode { font: 600 clamp(.95rem, 4.2vw, 1.25rem) ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .04em; text-align: center; padding: 14px;
  background: var(--panel-2); border-radius: 12px; margin: 10px 0; word-break: break-all; user-select: all; }
.bigcode.small { font-size: 1rem; }
.safety { font: 700 2rem ui-monospace, Menlo, monospace; text-align: center; letter-spacing: .1em; color: var(--accent); margin: 8px 0; }

/* layout */
.shell { display: grid; grid-template-columns: 340px minmax(0, 1fr); height: 100dvh; }
.sidebar { min-width: 0; background: var(--panel); border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; }
.chat { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.bar { display: flex; align-items: center; gap: 4px; padding: 8px 8px 8px 16px; padding-top: max(8px, env(safe-area-inset-top));
  border-bottom: 1px solid var(--line); background: var(--panel); min-height: 60px; }
.me { flex: 1; min-width: 0; }
.me-name { font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.status { font-size: .78rem; color: var(--accent); }
.status.off { color: var(--warn); }
.list { overflow-y: auto; flex: 1; padding-bottom: env(safe-area-inset-bottom); }
.contact { display: flex; align-items: center; gap: 12px; width: 100%; text-align: left; border: none; border-radius: 0;
  padding: 12px 16px; background: transparent; border-bottom: 1px solid var(--line); min-width: 0; }
.contact.active { background: var(--panel-2); }
.avatar { width: 42px; height: 42px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); display: grid;
  place-items: center; font-weight: 700; flex: none; }
.cinfo { flex: 1; min-width: 0; }
.cname { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.clast, .id { font-size: .82rem; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.id { font-family: ui-monospace, Menlo, monospace; }
.badge { background: var(--accent); color: var(--accent-ink); border-radius: 999px; min-width: 22px; height: 22px; padding: 0 6px;
  display: grid; place-items: center; font-size: .78rem; font-weight: 700; }
.badge.urgent { background: var(--urgent); color: #fff; animation: pulse 1.2s infinite; }
@keyframes pulse { 50% { transform: scale(1.15); } }
@media (prefers-reduced-motion: reduce) { .badge.urgent { animation: none; } }
.tag { font-size: .7rem; background: var(--panel-2); color: var(--muted); border-radius: 6px; padding: 1px 6px; margin-left: 6px; font-weight: 500; }
.request, .pending { margin: 0 12px 8px; padding: 12px; border: 1px solid var(--line); border-radius: 12px; display: flex;
  flex-direction: column; gap: 8px; }
.pending { flex-direction: row; justify-content: space-between; align-items: center; }
.pending > span { min-width: 0; }
.alert { background: var(--warn-soft); color: var(--warn); padding: 10px 14px; margin: 8px 12px; border-radius: 10px; font-size: .9rem; }
.hint { background: var(--accent-soft); padding: 10px 14px; margin: 8px 12px; border-radius: 10px; font-size: .9rem; }
.alert button, .hint button { min-height: 32px; padding: 4px 10px; margin-left: 4px; }

.empty { margin: auto; text-align: center; padding: 24px; max-width: 420px; color: var(--muted); }
.chat-head { gap: 8px; }
.chat-title { flex: 1; min-width: 0; }
.back { display: none; }
.messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 8px; overscroll-behavior: contain; }
.msg { max-width: min(78%, 620px); padding: 9px 12px 6px; border-radius: 16px; background: var(--in); border: 1px solid var(--line);
  align-self: flex-start; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg.out { align-self: flex-end; background: var(--out); border-color: transparent; }
.msg.urgent { border: 2px solid var(--urgent); background: var(--urgent-soft); }
.msg.broken { opacity: .7; font-style: italic; }
.urgent-tag { color: var(--urgent); font-weight: 800; font-size: .75rem; letter-spacing: .05em; }
.meta { font-size: .72rem; color: var(--muted); text-align: right; margin-top: 2px; }
.composer { display: flex; align-items: flex-end; gap: 8px; padding: 10px 12px; padding-bottom: max(10px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line); background: var(--panel); }
.composer textarea { resize: none; max-height: 160px; }
.urgent-toggle { margin: 0; display: flex; align-items: center; gap: 4px; font-size: 1.2rem; min-height: 44px; cursor: pointer; }
.urgent-toggle input { width: 18px; height: 18px; margin: 0; accent-color: var(--urgent); }
.send { flex: none; }

.overlay { position: fixed; inset: 0; background: rgba(2, 6, 23, .55); display: grid; place-items: center; padding: 16px; z-index: 50; }
.modal { background: var(--panel); border-radius: 18px; padding: 22px; width: min(480px, 100%); max-height: 90dvh; overflow-y: auto; box-shadow: var(--shadow); }
.modal-body > button { margin: 6px 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; flex-wrap: wrap; }
.device { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--line); }

.toast { position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom)); transform: translate(-50%, 20px); opacity: 0;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 10px; transition: .25s; z-index: 100; max-width: calc(100% - 32px); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.bad { background: var(--urgent); color: #fff; }
.toast.urgent { background: var(--urgent); color: #fff; font-weight: 700; }

@media (max-width: 759px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .shell .chat { display: none; }
  .shell.in-chat .sidebar { display: none; }
  .shell.in-chat .chat { display: flex; }
  .back { display: inline-block; }
  .msg { max-width: 88%; }
}