:root {
  --bg: #fbfbf9;
  --fg: #1c1c1a;
  --muted: #6b6b66;
  --card: #f0efeb;
  --border: #dddcd6;
  --accent: #2f5bd3;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --fg: #e8e7e3;
    --muted: #9a9993;
    --card: #222220;
    --border: #34332f;
    --accent: #8aa6ff;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 system-ui, -apple-system, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { margin-bottom: 32px; }
.logo { font-weight: 700; font-size: 20px; color: var(--fg); text-decoration: none; }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 12px; }
h2 { font-size: 18px; margin: 32px 0 8px; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.prompt { position: relative; background: var(--card); border: 1px solid var(--border); border-radius: 8px; }
.prompt pre { margin: 0; padding: 40px 16px 16px; white-space: pre-wrap; word-break: break-word; font: 13px/1.5 ui-monospace, Menlo, monospace; }
.prompt button { position: absolute; top: 8px; right: 8px; }
button, .button {
  display: inline-block;
  font: inherit;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--fg);
  color: var(--bg);
  cursor: pointer;
  text-decoration: none;
}
.prompt button { background: var(--bg); color: var(--fg); font-size: 12px; padding: 4px 10px; }
ul { padding-left: 20px; }
.note { border-left: 3px solid var(--accent); padding: 4px 0 4px 12px; }
textarea {
  width: 100%;
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--fg);
  resize: vertical;
}
.table { overflow-x: auto; }
table { border-collapse: collapse; font-size: 14px; width: 100%; }
th, td { padding: 6px 10px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; vertical-align: top; }
th { font-weight: 600; color: var(--muted); }
td.num { text-align: right; font-variant-numeric: tabular-nums; }
td .muted { font-size: 12px; }
button.danger { background: #b3261e; color: #fff; border-color: #b3261e; }
.msg { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; margin: 12px 0; max-width: 85%; }
.msg.from-A { background: var(--card); }
.msg.from-B { margin-left: auto; }
.msg .meta { font-size: 12px; color: var(--muted); }
.msg pre { margin: 6px 0 0; white-space: pre-wrap; word-break: break-word; font: 13px/1.5 ui-monospace, Menlo, monospace; }
.msg img { display: block; max-width: 100%; margin-top: 8px; border-radius: 4px; }