:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1d2330;
  --muted: #5b6475;
  --accent: #2557d6;
  --alert-bg: #fff4e5;
  --alert-border: #f0a43a;
  --border: #d7dbe3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171d;
    --card: #1e222b;
    --text: #e8ebf1;
    --muted: #a3abba;
    --accent: #7ea2ff;
    --alert-bg: #3a2c16;
    --alert-border: #c48527;
    --border: #353b47;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--accent); }
.top {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--card); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 600; text-decoration: none; color: var(--text); }
.pilot { font-size: 12px; padding: 2px 8px; border-radius: 10px; background: var(--alert-bg); }
main { max-width: 720px; margin: 24px auto; padding: 0 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.narrow { max-width: 440px; margin: 0 auto; }
h1 { font-size: 22px; margin: 0 0 12px; }
label { display: block; margin: 12px 0; font-weight: 500; }
input, select, textarea {
  display: block; width: 100%; margin-top: 4px; padding: 10px;
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px;
}
label.check { display: flex; align-items: center; gap: 8px; font-weight: 400; }
label.check input { width: auto; margin: 0; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) { .row { grid-template-columns: 1fr; } }
fieldset { border: 1px solid var(--border); border-radius: 8px; margin: 16px 0; }
button {
  padding: 12px 20px; font: inherit; font-weight: 600; color: #fff;
  background: var(--accent); border: 0; border-radius: 8px; cursor: pointer;
}
button.secondary { padding: 6px 12px; font-weight: 400; color: var(--accent); background: transparent; border: 1px solid var(--accent); }
.notice { background: var(--alert-bg); padding: 10px 12px; border-radius: 8px; }
.alert { background: var(--alert-bg); border-left: 4px solid var(--alert-border); padding: 10px 12px; border-radius: 8px; }
.muted { color: var(--muted); font-size: 14px; }
.docs { list-style: none; padding: 0; }
.docs li { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--border); }
.download { font-weight: 600; }
form.inline { margin: 0; }
footer { max-width: 720px; margin: 24px auto; padding: 0 16px; color: var(--muted); font-size: 13px; }
.links { margin-left: auto; font-size: 14px; display: flex; gap: 12px; }
.preview { white-space: pre-wrap; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 10px; max-height: 260px; overflow: auto; font-size: 13px; }
.bound-row { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; padding: 4px 0; border-bottom: 1px solid var(--border); }
.bound-text { flex: 1 1 100%; font-size: 13px; color: var(--muted); }
h2 { font-size: 18px; margin: 16px 0 8px; }
main { max-width: 1040px; }
.chat-top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; font-size: 14px; }
.chat-layout { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 16px; align-items: start; }
@media (max-width: 820px) { .chat-layout { grid-template-columns: 1fr; } }
.chat { display: flex; flex-direction: column; gap: 10px; max-height: 75vh; overflow-y: auto; }
.msg { white-space: pre-wrap; padding: 10px 12px; border-radius: 12px; max-width: 92%; font-size: 15px; }
.msg.user { align-self: flex-end; background: var(--alert-bg); }
.msg.assistant { align-self: flex-start; background: var(--bg); border: 1px solid var(--border); }
.msg-time { display: block; font-size: 11px; color: var(--muted); margin-top: 4px; }
.chat-input textarea { margin: 0; }
.chat-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; gap: 8px; }
.file-label { margin: 0; font-weight: 400; font-size: 14px; cursor: pointer; }
.file-label input { display: inline; width: auto; padding: 4px; }
.plan dl { margin: 0; }
.plan dt { font-size: 13px; color: var(--muted); margin-top: 8px; }
.plan dd { margin: 2px 0 0; font-size: 14px; }
.plan summary { cursor: pointer; }
.field-form { display: flex; gap: 6px; margin-top: 6px; }
.field-form input { margin: 0; padding: 6px; }
.need { font-size: 11px; background: var(--alert-bg); border-radius: 6px; padding: 1px 6px; color: var(--text); }
.msg.welcome { white-space: normal; }