:root {
  --primary: #0a3d91;
  --text: #13213c;
  --muted: #5b6b86;
  --surface: #ffffff;
  --background: #f7faff;
  --danger: #b42318;
  --warning: #b45309;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 16px;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--background);
  max-width: 820px;
}

h1 { font-size: 1.4rem; margin: 0 0 6px; color: var(--primary); }
h2 { font-size: 1.05rem; margin: 0 0 8px; }

section {
  background: var(--surface);
  border-radius: 12px;
  padding: 14px;
  margin: 12px 0;
  box-shadow: 0 1px 3px rgba(19, 33, 60, 0.12);
}

.row { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0; align-items: center; }

button, .file {
  font: inherit;
  padding: 9px 13px;
  border-radius: 9px;
  border: 1px solid #c7d2e5;
  background: #fff;
  color: var(--text);
  cursor: pointer;
}

button.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
button.danger { color: var(--danger); border-color: var(--danger); }
button:disabled { opacity: 0.45; cursor: default; }

.file input { display: block; margin-top: 4px; max-width: 220px; }

input[type="number"], input[type="text"] {
  font: inherit;
  width: 9em;
  padding: 6px 8px;
  border: 1px solid #c7d2e5;
  border-radius: 7px;
}

.hint { color: var(--muted); font-size: 0.9rem; margin: 6px 0; }

.warning {
  background: #fff4e5;
  color: var(--warning);
  font-weight: 600;
}

pre {
  background: #0f1b33;
  color: #d8e3f8;
  padding: 10px;
  border-radius: 8px;
  overflow: auto;
  max-height: 340px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.82rem;
}

/* The print frame stays out of sight while it prints. */
.print-frame {
  position: fixed;
  right: 0;
  bottom: 0;
  width: 1px;
  height: 1px;
  border: 0;
  opacity: 0;
}