:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1c2230;
  --muted: #6b7280;
  --line: #d9dce3;
  --brand: #ec185b;
  --brand-dark: #c30f49;
  --ok: #128a4a;
  --err: #c0322b;
  --radius: 12px;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Sarabun", "Noto Sans Thai", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
}
.card {
  max-width: 560px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}
.head h1 { font-size: 1.5rem; margin: 8px 0 4px; }
.sub { color: var(--muted); margin: 0 0 20px; font-size: 0.95rem; }

form { display: flex; flex-direction: column; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
label { font-weight: 600; font-size: 0.92rem; }
.req { color: var(--brand); }

input[type=text], input[type=tel], input[type=email], select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  background: #fff;
  color: var(--ink);
}
input:focus, select:focus { outline: 2px solid var(--brand); outline-offset: 1px; border-color: var(--brand); }
input[readonly] { background: #f0f1f4; color: var(--muted); }
select:disabled { background: #f0f1f4; color: var(--muted); }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 460px) { .grid2 { grid-template-columns: 1fr; } }

/* segmented customer-type control */
.seg { display: flex; gap: 8px; border: 0; padding: 0; margin: 0; }
.seg-opt { flex: 1; position: relative; }
.seg-opt input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.seg-opt span {
  display: block; text-align: center; padding: 12px; border: 1px solid var(--line);
  border-radius: 10px; font-weight: 600; background: #fff;
}
.seg-opt input:checked + span { border-color: var(--brand); background: #fdeef4; color: var(--brand-dark); }

.chk { display: flex; align-items: center; gap: 8px; font-weight: 500; font-size: 0.92rem; }
.chk input { width: 18px; height: 18px; accent-color: var(--brand); }
.switch { background: #fdeef4; border: 1px solid #f5c9d9; border-radius: 10px; padding: 11px 12px; }
.consent { color: var(--muted); font-size: 0.86rem; align-items: flex-start; }
.consent input { margin-top: 2px; }

.branch-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.branch-row input { width: 110px; }

details summary { cursor: pointer; font-weight: 600; font-size: 0.92rem; padding: 4px 0; }
details[open] { border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
details .grid2 { margin-top: 10px; }

.btn {
  margin-top: 4px; padding: 14px; border: 0; border-radius: 10px;
  background: var(--brand); color: #fff; font: inherit; font-weight: 700; font-size: 1.05rem;
  cursor: pointer;
}
.btn:hover { background: var(--brand-dark); }
.btn:disabled { opacity: 0.6; cursor: progress; }

.err { color: var(--err); font-size: 0.82rem; margin: 0; min-height: 0; }
.err:empty { display: none; }
.form-err { text-align: center; font-size: 0.95rem; }
input.invalid, select.invalid { border-color: var(--err); }

/* result screen */
.result { text-align: center; padding: 8px 0; }
.result.ok .code-box {
  margin: 16px auto; padding: 22px; border: 2px dashed var(--brand);
  border-radius: var(--radius); background: #fdeef4;
}
.result .code { font-size: 2.2rem; font-weight: 800; letter-spacing: 1px; color: var(--brand-dark); }
.barcode { display: block; margin: 14px auto 0; background: #fff; padding: 10px 12px; border-radius: 8px; max-width: 100%; height: auto; }
.result h2 { margin: 4px 0; }
.result p { color: var(--muted); }
.copy-btn { margin-top: 12px; padding: 10px 18px; border: 1px solid var(--brand); background: #fff; color: var(--brand-dark); border-radius: 10px; font: inherit; font-weight: 600; cursor: pointer; }
.again-btn { margin-top: 18px; padding: 12px 20px; border: 0; background: var(--ink); color: #fff; border-radius: 10px; font: inherit; cursor: pointer; }
.result.dup .icon, .result.ok .icon { font-size: 2.5rem; }