:root {
  --bg: #e9e9e9;
  --panel: #f7f7f7;
  --line: #cfcfcf;
  --text: #172338;
  --muted: #5e6570;
  --green: #208f00;
  --green-dark: #167000;
  --danger: #9b1c1c;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --sans: Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px 14px;
  border-bottom: 1px solid var(--line);
  background: #eeeeee;
}

.topbar h1 {
  margin: 0 0 12px;
  font-size: 22px;
  letter-spacing: -0.02em;
}

.topbar p { margin: 0; color: #333; }

button {
  border: 1px solid #c9c9c9;
  background: #fff;
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
}

button:hover { border-color: var(--green); color: var(--green-dark); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.layout {
  display: grid;
  grid-template-columns: minmax(520px, 1fr) minmax(360px, 42vw);
  gap: 22px;
  align-items: start;
  padding: 18px;
}

.formPanel,
.previewPanel { min-width: 0; }

.previewPanel {
  position: sticky;
  top: 14px;
  max-height: calc(100vh - 28px);
  overflow: auto;
}

.intro {
  max-width: 850px;
  line-height: 1.55;
  margin: 0 0 12px;
}

h2 {
  margin: 26px 0 10px;
  font-size: 15px;
  line-height: 1.25;
}

fieldset,
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  margin: 0 0 16px;
}

legend {
  padding: 0 8px;
  font-weight: 700;
}

.subbox {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px 14px;
  margin-top: 14px;
  background: #fff;
}

label {
  display: block;
  font-weight: 700;
  margin-bottom: 12px;
}

.subbox label,
fieldset > label:has(input[type="checkbox"]) {
  font-weight: 400;
}

input,
select,
textarea {
  width: 100%;
  margin-top: 6px;
  padding: 9px 10px;
  border: 1px solid #bfc3c7;
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

input[readonly] {
  background: #eeeeee;
  color: #343a43;
}

input[type="checkbox"] {
  width: auto;
  margin: 0 8px 0 0;
  vertical-align: -1px;
}

textarea { resize: vertical; }

.grid { display: grid; gap: 12px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.note {
  margin: 6px 0 14px;
  color: var(--muted);
  line-height: 1.45;
  font-size: 13px;
}

.req {
  color: var(--green-dark);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

pre {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.45;
  background: #fff;
  border: 1px solid #d4d4d4;
  border-radius: 8px;
  padding: 12px;
  max-height: 360px;
  overflow: auto;
}

.statusCard button {
  width: 100%;
  margin-top: 10px;
}

#sendNoZipBtn,
#sendZipBtn {
  background: var(--green);
  border-color: var(--green-dark);
  color: #fff;
}

#sendNoZipBtn:hover,
#sendZipBtn:hover { background: var(--green-dark); color: #fff; }

#sendNoZipBtn {
  background: #fff;
  color: var(--green-dark);
}

#sendNoZipBtn:hover {
  background: #f3fff0;
  color: var(--green-dark);
}

.buttonIntro {
  margin: 12px 0 2px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--muted);
  font-weight: 700;
}

.photoPreview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.photoPreview figure {
  margin: 0;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
}

.photoPreview img {
  width: 100%;
  height: 110px;
  object-fit: cover;
  display: block;
}

.photoPreview figcaption {
  padding: 8px;
  font-size: 11px;
  color: var(--muted);
}

#previewCanvas {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
}

.invalid {
  border-color: var(--danger) !important;
  box-shadow: 0 0 0 2px rgba(155, 28, 28, 0.12);
}

.errorText { color: var(--danger); font-weight: 700; }
.successText { color: var(--green-dark); font-weight: 700; }

#aboutDialog {
  max-width: 560px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
}

#aboutDialog::backdrop { background: rgba(0,0,0,0.22); }

@media (max-width: 1000px) {
  .layout { grid-template-columns: 1fr; }
  .previewPanel { position: static; max-height: none; }
}

@media (max-width: 640px) {
  .topbar { padding: 14px; }
  .topbar h1 { font-size: 19px; }
  .layout { padding: 12px; gap: 14px; }
  fieldset, .card { padding: 13px; }
  .grid.two, .grid.three { grid-template-columns: 1fr; }
}

.otherField {
  display: none;
}

.otherField.isVisible {
  display: block;
}