:root {
  color-scheme: light;
  --ivory: #f7f3ec;
  --beige: #e9dfd2;
  --taupe: #bba891;
  --brown: #5b5143;
  --charcoal: #342e28;
  --grid: #d8cdbf;
  --radius: 8px;
}

html,
body {
  width: 100%;
  margin: 0;
  padding: 0;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  background: var(--ivory);
  color: var(--charcoal);
  font-family: Arial, sans-serif;
  line-height: 1.5;
}

button,
input,
select {
  font: inherit;
}

.calculator-shell {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 40px 24px;
}

h1,
h2,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0 0 12px;
  color: var(--brown);
  font-family: "Arial Nova", Arial, sans-serif;
  font-size: 32pt;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 16px;
  color: var(--brown);
  font-size: 1.4rem;
  line-height: 1.2;
}

.intro-copy {
  max-width: 760px;
  margin: 0 0 28px;
  line-height: 1.6;
}

.calculator-section {
  margin-top: 28px;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 24px;
}

.field label {
  display: block;
  margin: 0 0 8px;
  color: var(--brown);
  font-family: "Noto Serif", Georgia, serif;
  font-size: 14pt;
  line-height: 1.2;
}

.field input,
.field select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--taupe);
  border-radius: 6px;
  padding: 10px 12px;
  background: var(--charcoal);
  color: var(--ivory);
  font-size: 16px;
  line-height: 1.2;
}

.field input:focus,
.field select:focus {
  outline: 2px solid var(--taupe);
  outline-offset: 1px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 8px 0 22px;
}

.result-card {
  min-height: 104px;
  border: 1px solid var(--taupe);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--beige);
}

.result-label {
  margin: 0 0 8px;
  color: var(--brown);
  font-size: 14px;
  line-height: 1.3;
}

.result-value {
  margin: 0;
  color: var(--charcoal);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.15;
}

.chart-wrap {
  width: 100%;
  min-height: 310px;
  margin: 8px 0 28px;
}

#growth-chart {
  display: block;
  width: 100%;
  height: 310px;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 8px 0 0;
  font-size: 14px;
}

.chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  width: 18px;
  height: 4px;
  border-radius: 999px;
}

.swatch.balance {
  background: var(--charcoal);
}

.swatch.contributions {
  background: var(--taupe);
}

.swatch.growth {
  background: var(--brown);
}

.note {
  border: 1px solid var(--taupe);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: var(--beige);
  line-height: 1.6;
}

.footnote {
  margin: 16px 0 0;
  color: var(--brown);
  font-size: 13px;
  line-height: 1.5;
}

@media (max-width: 720px) {
  .calculator-shell {
    padding: 28px 18px;
  }

  h1 {
    font-size: 28pt;
  }

  .input-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .result-card {
    min-height: auto;
  }
}