:root {
  --bg: #f6f7f9; --card: #ffffff; --text: #1a1d21; --muted: #667085;
  --border: #d9dee5; --accent: #2563eb; --accent-hover: #1d4ed8;
  --danger: #b42318; --ok: #067647; --err-bg: #fef3f2; --ok-bg: #ecfdf3; --busy-bg: #eff8ff;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.6; }
.top { background: #111827; color: #fff; padding: 28px 20px; text-align: center; }
.top h1 { margin: 0; font-size: 30px; letter-spacing: 2px; }
.subtitle { margin: 6px 0 0; color: #d1d5db; font-size: 14px; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 20px; }
.controls { display: flex; flex-wrap: wrap; gap: 14px; align-items: end; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; }
.controls label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; color: var(--muted); }
select, input, textarea { font-size: 16px; color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 9px 10px; background: #fff; }
select:focus, textarea:focus, input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.limit { margin-left: auto; font-size: 13px; color: var(--muted); }
.layout { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.pane { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 12px; }
.pane-head { display: flex; justify-content: space-between; font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.count { color: var(--muted); font-weight: 400; }
textarea { width: 100%; min-height: 340px; resize: vertical; line-height: 1.7; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
button { font-size: 15px; padding: 10px 18px; border-radius: 8px; border: 1px solid var(--border); background: #fff; cursor: pointer; }
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: 0.55; cursor: not-allowed; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover:not(:disabled) { background: var(--accent-hover); }
button.danger { color: var(--danger); }
.status { margin-top: 14px; padding: 12px 14px; border-radius: 8px; background: var(--card); border: 1px solid var(--border); font-size: 14px; white-space: pre-wrap; }
.status.ok { background: var(--ok-bg); color: var(--ok); border-color: #a6f4c5; }
.status.err { background: var(--err-bg); color: var(--danger); border-color: #fecdca; }
.status.busy { background: var(--busy-bg); color: #175cd3; border-color: #b2ddff; }
.notes { margin-top: 20px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; font-size: 14px; color: var(--muted); }
.notes h2 { font-size: 16px; color: var(--text); margin: 0 0 8px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin-top: 16px; }
.card label { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; font-size: 14px; color: var(--muted); }
.card input { width: 100%; }
pre { white-space: pre-wrap; word-break: break-word; font-size: 13px; background: #f2f4f7; padding: 12px; border-radius: 8px; }
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  textarea { min-height: 260px; }
  .limit { margin-left: 0; }
  .top h1 { font-size: 24px; }
}