:root {
  --brand: #2c7a7b;
  --brand-dark: #225d5e;
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #e2e6ea;
  --text: #1f2933;
  --muted: #6b7785;
  --danger: #c0392b;
  --ok: #2f855a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--brand); text-decoration: none; }
.topbar {
  background: var(--brand);
  color: #fff;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.topbar a { color: #fff; }
.topbar .brand { font-weight: 600; font-size: 16px; }
.container { max-width: 860px; margin: 0 auto; padding: 18px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 16px;
}
h1 { font-size: 20px; margin: 0 0 14px; }
h2 { font-size: 16px; margin: 18px 0 8px; }
label { display: block; font-size: 13px; color: var(--muted); margin: 10px 0 4px; }
input[type=text], input[type=password], input[type=number], textarea, select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
}
textarea { min-height: 80px; resize: vertical; }
.btn {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 15px;
  cursor: pointer;
}
.btn:hover { background: var(--brand-dark); }
.btn.secondary { background: #fff; color: var(--brand); border: 1px solid var(--brand); }
.btn.danger { background: var(--danger); }
.btn.block { display: block; width: 100%; text-align: center; }
.muted { color: var(--muted); font-size: 13px; }
.error { color: var(--danger); font-size: 14px; margin: 8px 0; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--border); font-size: 14px; }
.badge { font-size: 12px; padding: 2px 8px; border-radius: 999px; }
.badge.draft { background: #edf2f7; color: #4a5568; }
.badge.awaiting_sign { background: #fefcbf; color: #975a16; }
.badge.signed { background: #c6f6d5; color: var(--ok); }
.badge.void { background: #fed7d7; color: var(--danger); }
.row { display: flex; gap: 10px; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 120px; }
.item-row { display: grid; grid-template-columns: 2fr 1fr 0.6fr 1fr auto; gap: 8px; align-items: center; margin-bottom: 8px; }
.confirm-item { display: flex; gap: 10px; align-items: flex-start; margin: 10px 0; }
.confirm-item input { width: auto; margin-top: 5px; }
canvas#pad { border: 1px dashed var(--brand); border-radius: 8px; width: 100%; height: 180px; touch-action: none; background: #fff; }
.qr { text-align: center; }
.qr img { width: 220px; height: 220px; }
.hash { font-family: monospace; font-size: 11px; color: var(--muted); word-break: break-all; }
@media (max-width: 600px) {
  .item-row { grid-template-columns: 1fr 1fr; }
}