:root {
  --bg: #f6f7f9;
  --paper: #fff;
  --ink: #18202a;
  --muted: #667085;
  --line: #d9dee7;
  --accent: #2563eb;
  --danger: #b42318;
  --ok: #0f766e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 18px 56px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 18px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a, .btn, button {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--paper);
  color: var(--ink);
  padding: 8px 12px;
  cursor: pointer;
  font: inherit;
}

.btn.primary, button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn.danger, button.danger {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
}

h1 { font-size: 28px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 0 0 14px; }
h3 { font-size: 16px; margin: 18px 0 8px; }
p { margin: 0 0 12px; }

.muted { color: var(--muted); }
.ok { color: var(--ok); }
.danger-text { color: var(--danger); }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
}

label {
  display: grid;
  gap: 6px;
  font-weight: 650;
}

input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 9px 10px;
  font: inherit;
  background: #fff;
}

textarea { min-height: 86px; resize: vertical; }

.full { grid-column: 1 / -1; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th, td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  padding: 10px 8px;
}

th { color: var(--muted); font-weight: 650; }

.status {
  display: inline-block;
  border-radius: 999px;
  padding: 2px 8px;
  background: #eef2ff;
  color: #3730a3;
  font-size: 12px;
  font-weight: 700;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

code {
  background: #f2f4f7;
  border-radius: 5px;
  padding: 2px 5px;
}

.qr-thumb {
  display: block;
  width: 96px;
  height: 96px;
}

.qr-panel {
  text-align: center;
}

.qr-large {
  width: min(360px, 100%);
  height: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #fff;
}

@media (max-width: 760px) {
  .topbar { display: block; }
  .grid, .form-grid { grid-template-columns: 1fr; }
  .page { padding: 18px 12px 40px; }
  table { font-size: 13px; }
}