:root {
  --green: #2f6b3f;
  --green-dark: #214d2d;
  --green-light: #e8f3ea;
  --text: #1f2a22;
  --muted: #5f6b62;
  --border: #d5ddd7;
  --red: #b3261e;
  --red-light: #fdecea;
  --bg: #f6f8f6;
  --radius: 12px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Sarabun", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
.container { max-width: 560px; margin: 0 auto; padding: 16px; }
header.site { background: var(--green); color: #fff; padding: 14px 16px; }
header.site a { color: #fff; text-decoration: none; font-weight: 700; }
h1 { font-size: 1.5rem; margin: 0.4em 0; }
h2 { font-size: 1.2rem; margin: 0.6em 0; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin: 12px 0; }
.muted { color: var(--muted); font-size: 0.95rem; }
.hidden { display: none !important; }
.field { display: block; margin: 12px 0; }
.field > span { display: block; font-weight: 600; margin-bottom: 4px; }
input[type="text"], input[type="number"], input[type="password"], select, textarea {
  width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: #fff;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--green); outline-offset: 1px; }
.btn { display: inline-block; font: inherit; font-weight: 600; padding: 12px 18px; border-radius: 10px; border: 1px solid var(--green);
  background: #fff; color: var(--green); cursor: pointer; text-align: center; text-decoration: none; }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-dark); }
.btn-block { display: block; width: 100%; margin: 8px 0; }
.btn:disabled { opacity: 0.6; cursor: wait; }
.error { background: var(--red-light); color: var(--red); border-radius: 8px; padding: 10px 12px; margin: 10px 0; }
.type-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.type-options label { border: 2px solid var(--border); border-radius: 10px; padding: 12px 6px; text-align: center; cursor: pointer; background: #fff; }
.type-options input { position: absolute; opacity: 0; }
.type-options label:has(input:checked) { border-color: var(--green); background: var(--green-light); font-weight: 700; }
.code-box { font-size: 2.2rem; font-weight: 700; letter-spacing: 0.3em; text-align: center; padding: 12px; border: 2px dashed var(--green);
  border-radius: 10px; background: var(--green-light); margin: 12px 0; }
.combo { position: relative; }
.combo-list { position: absolute; z-index: 10; left: 0; right: 0; max-height: 260px; overflow-y: auto; margin: 2px 0 0; padding: 0;
  list-style: none; background: #fff; border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 6px 18px rgba(0,0,0,.12); }
.combo-list li { padding: 10px 12px; cursor: pointer; border-bottom: 1px solid #eef1ef; }
.combo-list li:hover, .combo-list li.active { background: var(--green-light); }
.combo-list li.other { color: var(--green); font-weight: 600; }
.question { margin: 18px 0; }
.question.missing { outline: 2px solid var(--red); border-radius: 8px; padding: 6px; }
.choice { display: flex; gap: 10px; align-items: flex-start; border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; margin: 6px 0; background: #fff; cursor: pointer; }
.choice input { margin-top: 5px; }
.choice.correct { border-color: var(--green); background: var(--green-light); }
.choice.wrong { border-color: var(--red); background: var(--red-light); }
.progress { list-style: none; padding: 0; margin: 0; }
.station-item { display: flex; justify-content: space-between; align-items: center; padding: 12px; border: 1px solid var(--border); border-radius: 10px; margin: 8px 0; background: #fff; }
.station-item.passed { border-color: var(--green); background: var(--green-light); }
.badge { font-size: 0.85rem; padding: 2px 10px; border-radius: 999px; background: #eceff0; color: var(--muted); white-space: nowrap; }
.passed .badge { background: var(--green); color: #fff; }
canvas.cert-preview { width: 100%; height: auto; border: 1px solid var(--border); border-radius: 8px; background: #fff; }

/* ---------- admin ---------- */
.admin .container { max-width: 1100px; }
nav.admin-nav { display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: center; background: var(--green-dark); padding: 10px 16px; }
nav.admin-nav a { color: #dfeee2; text-decoration: none; }
nav.admin-nav a.active { color: #fff; font-weight: 700; text-decoration: underline; }
nav.admin-nav span { color: #fff; }
nav.admin-nav .spacer { flex: 1; }
nav.admin-nav button { font: inherit; background: none; border: 1px solid #dfeee2; color: #fff; border-radius: 6px; padding: 2px 10px; cursor: pointer; }
table.data { width: 100%; border-collapse: collapse; background: #fff; font-size: 0.95rem; }
table.data th, table.data td { border-bottom: 1px solid var(--border); padding: 8px; text-align: left; vertical-align: top; }
table.data th { background: var(--green-light); }
.table-wrap { overflow-x: auto; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.row > * { flex: 0 0 auto; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
.stat { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.stat .value { font-size: 2rem; font-weight: 700; color: var(--green); }
.warn { background: #fff6e0; color: #7a5200; border-radius: 8px; padding: 8px 12px; margin: 8px 0; }
.q-item { border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin: 10px 0; background: #fff; }
.q-item ol { margin: 6px 0; }
.q-item li.is-correct { color: var(--green); font-weight: 700; }
.btn-small { padding: 6px 12px; font-size: 0.9rem; }
.btn-danger { border-color: var(--red); color: var(--red); }
.qr-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.qr-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; text-align: center; break-inside: avoid; }
.qr-card canvas { width: 220px; height: 220px; image-rendering: pixelated; }
.qr-card .url { font-size: 0.75rem; word-break: break-all; color: var(--muted); }
@media print {
  nav.admin-nav, header.site, .no-print { display: none !important; }
  body { background: #fff; }
  .qr-grid { grid-template-columns: 1fr 1fr; }
  .qr-card { border: 2px solid #000; page-break-inside: avoid; }
}