:root {
  --ink: #1b1a17;
  --muted: #6b6358;
  --paper: #f6f1e6;
  --card: #fffdf8;
  --line: #d9d0c0;
  --stamp: #9c2b1e;
  --ok: #2c5e3a;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font: 15px/1.5 "Source Han Serif SC", "Songti SC", "Noto Serif SC", Georgia, serif;
  color: var(--ink);
  background: var(--paper);
}
.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 24px; border-bottom: 1px solid var(--line); background: var(--card);
}
.top nav { display: flex; gap: 16px; align-items: center; }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; }
a { color: var(--stamp); }
button, input, textarea {
  font: inherit; color: inherit;
}
button {
  background: var(--ink); color: var(--card); border: 0; padding: 8px 14px; cursor: pointer;
}
button.primary { background: var(--stamp); }
button.linkish { background: none; color: var(--stamp); padding: 0; }
.login-body { min-height: 100vh; display: grid; place-items: center; }
.login-card {
  width: min(420px, 92vw); background: var(--card); padding: 36px;
  border: 1px solid var(--line); box-shadow: 8px 10px 0 rgba(27,26,23,.08);
}
.eyebrow { letter-spacing: .16em; color: var(--stamp); font-size: 12px; }
.lede, .status { color: var(--muted); }
label { display: block; margin: 10px 0; }
input, textarea {
  width: 100%; border: 1px solid var(--line); background: #fff; padding: 8px 10px;
}
.error { color: var(--stamp); }
.work { display: grid; grid-template-columns: 2fr 3fr; min-height: calc(100vh - 54px); }
.chat-pane, .confirm-pane { padding: 20px 24px; }
.chat-pane { border-right: 1px solid var(--line); background: #efe8d8; }
.messages { height: calc(100vh - 280px); overflow: auto; display: flex; flex-direction: column; gap: 10px; }
.msg { background: var(--card); padding: 10px 12px; border: 1px solid var(--line); }
.msg.user { border-left: 3px solid var(--ink); }
.msg.assistant { border-left: 3px solid var(--stamp); }
.msg pre { white-space: pre-wrap; margin: 0; font: inherit; }
.grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px 12px; }
.lines { width: 100%; border-collapse: collapse; font-size: 13px; margin: 12px 0; }
.lines th, .lines td { border: 1px solid var(--line); padding: 4px; }
.lines input { border: 0; padding: 4px; }
.issues { color: var(--stamp); }
.actions { display: flex; gap: 12px; align-items: center; margin-top: 16px; }
.hidden { display: none; }
.page { padding: 24px; }
.plain { width: 100%; border-collapse: collapse; background: var(--card); }
.plain th, .plain td { border-bottom: 1px solid var(--line); text-align: left; padding: 8px; }
.row { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-top: 8px; }
@media (max-width: 960px) {
  .work { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr 1fr; }
}

.chat-pane, .confirm-pane { min-width: 0; }
.table-scroll { overflow-x: auto; }
.lines { min-width: 1400px; }
.lines input { min-width: 80px; }
.actions { flex-wrap: wrap; }
button:disabled { opacity: .6; cursor: wait; }
input[readonly] { background: #eee9df; }