:root {
  --paper: #f3efe6;
  --ink: #1c1917;
  --muted: #5c574e;
  --line: #d8d0c2;
  --card: #fbf8f1;
  --accent: #0f4c3a;
  --behind: #9b1c1c;
  --focus: #1f6f54;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.45;
}

.page {
  width: min(34rem, calc(100% - 2rem));
  margin: 2.5rem auto 4rem;
}

header h1 {
  font-family: Georgia, "Iowan Old Style", serif;
  font-size: 1.85rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
}

.lede {
  margin: 0 0 1.75rem;
  color: var(--muted);
}

form,
.results {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.15rem 1.15rem 1.25rem;
}

.field {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.9rem;
}

.field:last-of-type {
  margin-bottom: 1rem;
}

label,
.group-label {
  font-size: 0.92rem;
  font-weight: 600;
}

.duration {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.field.nested {
  margin-bottom: 0;
}

input[type="date"],
input[type="text"],
input[type="number"] {
  font: inherit;
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: inherit;
}

input:focus {
  outline: 2px solid var(--focus);
  outline-offset: 1px;
}

button {
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border: 0;
  border-radius: 8px;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: #f7f4ee;
}

button:hover {
  filter: brightness(1.08);
}

.error {
  margin: 0.85rem 0 0;
  color: var(--behind);
  font-size: 0.92rem;
}

.results {
  margin-top: 1rem;
}

.hero {
  padding-bottom: 1rem;
  margin-bottom: 0.35rem;
  border-bottom: 1px solid var(--line);
}

.hero-label {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero-value {
  display: block;
  margin-top: 0.2rem;
  font-family: Georgia, "Iowan Old Style", serif;
  font-size: 2.6rem;
  color: var(--accent);
  line-height: 1.1;
}

.row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
}

.row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.row dt {
  margin: 0;
  color: var(--muted);
}

.row dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.is-behind {
  color: var(--behind);
}

.note {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

footer {
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}