:root {
  --bg: #fafaf7; --fg: #1d1d1b; --sub: #6b6b66; --line: #e2e1dc; --card: #ffffff; --accent: #1f5fbf;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161615; --fg: #ecebe6; --sub: #9b9a94; --line: #2e2d2a; --card: #1e1e1c; --accent: #7fb0ff; }
}
[hidden] { display: none !important; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.6 system-ui, -apple-system, "Hiragino Sans", sans-serif; }
header, main { max-width: 640px; margin: 0 auto; padding: 16px; }
header { border-bottom: 1px solid var(--line); }
h1 { font-size: 20px; margin: 0; }
h2 { font-size: 15px; margin: 0; }
.sub { color: var(--sub); font-size: 13px; margin: 4px 0; overflow-wrap: anywhere; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 12px 0 8px; }
input, textarea { width: 100%; font: inherit; color: inherit; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
button { font: inherit; font-size: 13px; color: var(--accent); background: none; border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; cursor: pointer; }
button[type=submit] { color: #fff; background: var(--accent); border-color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
ol { list-style: none; margin: 0; padding: 0; }
li.post { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; }
li.post.mine { border-left: 3px solid var(--accent); }
.head { display: flex; justify-content: space-between; gap: 8px; font-size: 13px; color: var(--sub); }
.head b { color: var(--fg); }
.text { white-space: pre-wrap; overflow-wrap: anywhere; margin: 4px 0 6px; }
.acts { display: flex; gap: 6px; flex-wrap: wrap; }
.acts button.on { color: #fff; background: var(--accent); border-color: var(--accent); }
.re { font-size: 12px; color: var(--sub); }
#threadBox { border: 1px dashed var(--line); border-radius: 10px; padding: 0 10px 4px; margin-bottom: 16px; }
#errors { padding-left: 18px; }