:root {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color-scheme: light dark;
  --border: color-mix(in srgb, CanvasText 25%, transparent);
  --border-strong: color-mix(in srgb, CanvasText 45%, transparent);
  --muted-bg: color-mix(in srgb, CanvasText 6%, transparent);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem 4rem;
  background: Canvas;
  color: CanvasText;
  line-height: 1.45;
}

main {
  width: 100%;
  max-width: 760px;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

h2 {
  margin: 0;
  font-size: 1.1rem;
}

.subtitle {
  margin: 0 0 1.5rem;
  color: GrayText;
}

.muted { color: GrayText; }

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
}

fieldset.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

legend {
  padding: 0 0.4rem;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: GrayText;
}

label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

input[type="date"],
input[type="number"],
select {
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  font: inherit;
  background: Canvas;
  color: CanvasText;
}

input[type="number"] { width: 5rem; }

button {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  background: ButtonFace;
  color: ButtonText;
  font: inherit;
  cursor: pointer;
}

button:hover { filter: brightness(0.95); }
button:active { filter: brightness(0.9); }

#form > button[type="submit"] {
  background: AccentColor;
  color: AccentColorText;
  border-color: AccentColor;
  font-weight: 600;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.results-summary {
  margin: 0.75rem 0 0;
  font-size: 1rem;
  color: CanvasText;
}

.results-summary strong {
  color: AccentColor;
}

.table-wrap {
  overflow-x: auto;
  margin: 0.5rem 0 0;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-variant-numeric: tabular-nums;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody tr:last-child td { border-bottom: none; }

td.original-cell {
  font-weight: 600;
  vertical-align: top;
  border-right: 1px solid var(--border);
  background: var(--muted-bg);
}

th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: GrayText;
  background: var(--muted-bg);
}

#copyStatus { margin-left: 0.5rem; font-size: 0.9rem; }

details {
  margin-top: 2rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
}

summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.25rem 0;
}

details p {
  font-size: 0.92rem;
  margin: 0.5rem 0;
}

details code {
  background: var(--muted-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.9em;
}

@media (max-width: 480px) {
  body { padding: 1rem 0.75rem 3rem; }
  h1 { font-size: 1.5rem; }
}