* { box-sizing: border-box; }
:root {
  --pf-red: #c1292d;
  --pf-red-dark: #a01f23;
  --pf-slate: #373e4b;
  --pf-gray: #d3d3d3;
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f4f4f6;
  color: #1c1c1e;
}
header {
  padding: 14px 24px;
  background: #fff;
  border-bottom: 3px solid var(--pf-red);
  color: var(--pf-slate);
  display: flex;
}
.brand { display: flex; align-items: center; gap: 16px; }
.brand .logo { height: 40px; }
.brand-text h1 { margin: 0; font-size: 18px; font-weight: 600; color: var(--pf-slate); }
.brand-text p { margin: 2px 0 0; font-size: 12px; color: #6b7280; }

main {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 16px;
  padding: 16px;
  align-items: start;
}

#panel-left {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#drop-zone {
  border: 2px dashed var(--pf-gray);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  font-size: 13px;
  color: #666;
  background: #fff;
}
#drop-zone.dragging { border-color: var(--pf-red); background: #fdeceb; }

#zpl-input {
  width: 100%;
  height: 360px;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  padding: 10px;
  border: 1px solid var(--pf-gray);
  border-radius: 8px;
  resize: vertical;
}

#render-options {
  background: #fff;
  border: 1px solid var(--pf-gray);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.opt-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 12px;
  color: #444;
}
.opt-row label { white-space: nowrap; }
.opt-row .opt-inline { margin-left: 8px; }
.opt-row select, .opt-row input[type="number"] {
  padding: 5px 6px;
  border: 1px solid var(--pf-gray);
  border-radius: 6px;
  font-size: 12px;
}
.opt-row input[type="number"] { width: 64px; }

.btn-row { display: flex; gap: 8px; }

#render-btn, #pdf-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 600;
}
#render-btn { background: var(--pf-red); color: #fff; }
#render-btn:hover { background: var(--pf-red-dark); }
#pdf-btn { background: var(--pf-slate); color: #fff; }
#pdf-btn:hover { background: #2a2f39; }

#gtin-panel {
  background: #fff;
  border: 1px solid var(--pf-gray);
  border-radius: 8px;
  padding: 10px 12px;
}
#gtin-panel.hidden { display: none; }
#gtin-panel h3 { margin: 0 0 6px; font-size: 12px; color: #666; }
#gtin-select {
  width: 100%;
  padding: 6px;
  border: 1px solid var(--pf-gray);
  border-radius: 6px;
  font-size: 13px;
}

.label-note {
  margin-top: 6px;
  font-size: 11px;
  color: #a36b00;
  background: #fff7e6;
  border-radius: 4px;
  padding: 4px 6px;
}
.label-rfid {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid #eee;
  font-size: 11px;
  max-width: 480px;
}
.rfid-entry { margin-bottom: 8px; padding-bottom: 6px; border-bottom: 1px solid #f4f4f6; }
.rfid-entry:last-child { border-bottom: none; }
.rfid-hex code, .rfid-ascii code, .rfid-gs1 code {
  word-break: break-all;
  background: #f4f4f6;
  padding: 2px 4px;
  border-radius: 4px;
}
.rfid-gs1 {
  margin-top: 4px;
  padding: 6px 8px;
  background: #fdeceb;
  border-radius: 6px;
}
.rfid-gs1-detail {
  display: block;
  color: #888;
  font-size: 11px;
  margin-top: 2px;
}

#output-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#pager {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  border: 1px solid var(--pf-gray);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
}
#pager.hidden { display: none; }
#pager button {
  padding: 6px 12px;
  border: 1px solid var(--pf-gray);
  border-radius: 6px;
  background: #f4f4f6;
  cursor: pointer;
}
#pager button:disabled { opacity: 0.4; cursor: default; }

#label-output {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.label-card {
  background: #fff;
  border: 1px solid var(--pf-gray);
  border-radius: 8px;
  padding: 10px;
}
.label-caption { font-size: 11px; color: #888; margin-bottom: 6px; }
.label-card img {
  display: block;
  max-width: 480px;
  width: 100%;
  height: auto;
  background: #fff;
  border: 1px solid #eee;
}
.placeholder, .error { color: #888; font-size: 13px; padding: 20px; }
.error { color: var(--pf-red); }

footer {
  text-align: center;
  padding: 16px;
  font-size: 12px;
  color: #999;
}