:root {
  color-scheme: light dark;
  --bg: #f4f1ec;
  --fg: #2a2622;
  --muted: #7d746b;
  --line: #ddd5ca;
  --card: #fffdf9;
  --accent: #5a7a8c;
  --danger: #b4483a;
  --pet: #e9eef1;
  --me: #efe6d8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d1b19;
    --fg: #ece6de;
    --muted: #a0968b;
    --line: #3a3530;
    --card: #262320;
    --accent: #8fb0c2;
    --danger: #e07a6b;
    --pet: #2b3237;
    --me: #3a332a;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "PingFang TC", "Noto Sans TC", sans-serif;
  -webkit-text-size-adjust: 100%;
}
#app { height: 100%; }
[hidden] { display: none !important; }
.screen { min-height: 100%; padding: max(16px, env(safe-area-inset-top)) 16px max(16px, env(safe-area-inset-bottom)); }
.center { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 8px; }
.center > * { max-width: 420px; }
.stack { display: flex; flex-direction: column; gap: 10px; width: 100%; }
.pad { padding: 16px; max-width: 560px; margin: 0 auto; }
h1 { font-size: 1.6rem; margin: 0 0 8px; letter-spacing: .2em; }
h2 { font-size: 1rem; margin: 16px 0 0; }
.big { font-size: 1.15rem; }
.muted { color: var(--muted); font-size: .92rem; }
.error { color: var(--danger); min-height: 1.2em; margin: 0; }
label { display: flex; flex-direction: column; gap: 4px; text-align: left; font-size: .9rem; color: var(--muted); }
input {
  font: inherit; color: var(--fg); background: var(--card);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; width: 100%;
}
button {
  font: inherit; border-radius: 8px; padding: 10px 16px; border: 1px solid var(--accent);
  background: var(--accent); color: #fff; cursor: pointer;
}
button.quiet { background: transparent; color: var(--fg); border-color: var(--line); }
button.danger { background: transparent; color: var(--danger); border-color: var(--danger); }
a { color: var(--accent); }

.call { display: flex; flex-direction: column; height: 100%; padding: 0; }
.callbar {
  display: flex; align-items: center; gap: 10px;
  padding: max(10px, env(safe-area-inset-top)) 12px 10px; border-bottom: 1px solid var(--line); background: var(--bg);
}
.callbar button { padding: 6px 12px; font-size: .9rem; }
.spacer { flex: 1; }
.stage {
  flex: 0 0 auto; min-height: 30vh; display: flex; flex-direction: column; align-items: center; justify-content: center;
  border-bottom: 1px solid var(--line); background: var(--card);
}
.typing { font-size: 1.4rem; letter-spacing: .3em; margin: 0; }
.log { flex: 1 1 auto; overflow-y: auto; list-style: none; margin: 0; padding: 12px; display: flex; flex-direction: column; gap: 8px; }
.log li { max-width: 80%; padding: 8px 12px; border-radius: 14px; white-space: pre-wrap; overflow-wrap: anywhere; }
.log li.pet { align-self: flex-start; background: var(--pet); }
.log li.me { align-self: flex-end; background: var(--me); }
.log li.system { align-self: center; color: var(--muted); font-size: .88rem; background: transparent; }
/* line_ping（§7.4）：小電腦在 M2，M1 先在對話串裡顯示一行預覽 */
.log li.line { align-self: flex-end; color: var(--muted); font-size: .88rem; background: transparent; border: 1px dashed var(--muted); }
.bindcode { font-size: 1.6rem; letter-spacing: .2em; font-variant-numeric: tabular-nums; }
.sayform { display: flex; gap: 8px; padding: 10px 12px max(10px, env(safe-area-inset-bottom)); border-top: 1px solid var(--line); background: var(--bg); }
.sayform input { flex: 1; }

.overlay { position: fixed; inset: 0; overflow-y: auto; background: var(--bg); z-index: 10; }
.devices { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.devices li { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); }
.devices li span { flex: 1; overflow-wrap: anywhere; }
.devices li button { padding: 4px 10px; font-size: .85rem; }