:root {
  --bg: #f7f8f6;
  --panel: #ffffff;
  --ink: #17201b;
  --muted: #5b665f;
  --line: #dfe4e0;
  --field-line: #7a867f;
  --simple: #c2410c;
  --brand: #0f5132;
  --brand-ink: #ffffff;
  --contrib: #8aa89a;
  --interest: #1f8a5b;
  --err: #b42318;
  --focus: #2563eb;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1412;
    --panel: #171e1b;
    --ink: #e8eeea;
    --muted: #9aa8a0;
    --line: #2a3530;
    --field-line: #66766e;
    --simple: #fb923c;
    --brand: #3ccf8e;
    --brand-ink: #06140d;
    --contrib: #5f7a6d;
    --interest: #3ccf8e;
    --err: #ff8a80;
    --focus: #8ab4ff;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--panel); padding: 8px 12px; z-index: 10; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

[hidden] { display: none !important; }
a { color: var(--brand); }

.site-header { border-bottom: 1px solid var(--line); background: var(--panel); }
.site-header .wrap { padding-top: 8px; padding-bottom: 8px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0 20px; }
/* The wordmark (brand I1, I2): the brand name in bold, in ledger, with clear
   space at least the height of its capital S on every side (6px + the
   header's 8px above and below; 12px before the descriptor). The descriptor
   (W1.1) sits beside it, or directly under it when the line is too narrow, in
   plain muted text, outside the link's bold style. */
.brand-block { display: flex; flex-wrap: wrap; align-items: baseline; column-gap: 12px; }
.brand { font-weight: 700; color: var(--brand); text-decoration: none; letter-spacing: .2px; padding: 6px 0; }
.descriptor { color: var(--muted); font-size: .9rem; font-weight: 400; }
/* The standalone calculator's header: the wordmark, then the tool name as a plain label. */
.tool-name { color: var(--ink); font-size: .95rem; padding: 6px 0; }

.hero { padding-top: 36px; padding-bottom: 8px; }
h1 { font-size: clamp(1.9rem, 4.5vw, 2.6rem); line-height: 1.15; margin: 0 0 10px; }
.lede { color: var(--muted); font-size: 1.1rem; max-width: 640px; margin: 0; }

.calculator { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 20px; padding-top: 24px; padding-bottom: 20px; }
@media (max-width: 820px) { .calculator { grid-template-columns: minmax(0, 1fr); } }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }

.field { margin: 0 0 14px; border: 0; padding: 0; min-width: 0; }
.field > label, legend { display: block; font-weight: 600; font-size: .95rem; margin-bottom: 6px; padding: 0; }
input, select {
  width: 100%; font: inherit; color: var(--ink); background: var(--bg);
  border: 1px solid var(--field-line); border-radius: 10px; padding: 10px 12px; min-height: 44px;
}
input[aria-invalid="true"] { border-color: var(--err); }
.affix { position: relative; }
.affix > span { position: absolute; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; }
.affix:not(.suffix) > span { left: 12px; }
.affix:not(.suffix) > input { padding-left: 26px; }
.affix.suffix > span { right: 12px; }
.affix.suffix > input { padding-right: 30px; }
.err { color: var(--err); font-size: .875rem; margin: 4px 0 0; min-height: 0; }
.err:empty { display: none; }

.toggle { display: grid; gap: 8px; }
.toggle label { display: flex; align-items: center; gap: 10px; font-weight: 400; cursor: pointer; }
.toggle input { width: 20px; height: 20px; min-height: 0; accent-color: var(--brand); }

.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 8px; }
.btn {
  font: inherit; font-weight: 600; border: 0; border-radius: 10px; padding: 10px 14px; min-height: 44px;
  background: var(--brand); color: var(--brand-ink); cursor: pointer;
}
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.muted { color: var(--muted); font-size: .9rem; }
.share { margin: 12px 0 0; }
.share[hidden] { display: none; }
.share input { font-size: .9rem; }
#out-summary { overflow-wrap: anywhere; }

.results .label { margin: 0 0 10px; font-size: 1rem; color: var(--muted); font-weight: 600; }
.big { font-size: clamp(2.1rem, 6vw, 3rem); font-weight: 750; line-height: 1.1; margin: 4px 0 6px; font-variant-numeric: tabular-nums; }
.split { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 14px 0 10px; }
@media (max-width: 520px) { .split { grid-template-columns: minmax(0, 1fr); } }
.split div { background: var(--bg); border-radius: 10px; padding: 12px; }
.split dt { color: var(--muted); font-size: .9rem; display: flex; align-items: center; gap: 8px; }
.split dd { margin: 4px 0 0; font-size: 1.2rem; font-weight: 700; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.split .hi { background: color-mix(in srgb, var(--interest) 14%, var(--bg)); }
.split .hi dd { color: var(--ink); font-size: 1.45rem; }
.key { width: 12px; height: 12px; border-radius: 3px; display: inline-block; flex: none; }
.key-contrib { background: var(--contrib); }
.key-interest { background: var(--interest); }
.key-compound { background: var(--interest); }
.key-simple { background: repeating-linear-gradient(90deg, var(--simple) 0 3px, transparent 3px 6px); }
.legend { list-style: none; display: flex; flex-wrap: wrap; gap: 6px 16px; padding: 0; margin: 8px 0 0; color: var(--muted); font-size: .9rem; }
.legend li { display: flex; align-items: center; gap: 8px; }

.results.stale .chart, .results.stale .split, .results.stale .legend { opacity: .35; }
.chart { aspect-ratio: 640 / 280; }
.chart svg { display: block; width: 100%; height: auto; }
.chart .ln { fill: none; stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; }
.chart .ln-compound { stroke: var(--interest); }
.chart .ln-simple { stroke: var(--simple); stroke-dasharray: 1 6; stroke-width: 3.5; }
.chart .ln-contrib { stroke: var(--contrib); stroke-width: 2; stroke-dasharray: 5 5; }
#calculator.calculator .chart { aspect-ratio: 640 / 480; } /* the compound vs simple chart only, not the inflation page's */
.chart .gap { fill: var(--interest); opacity: .22; }
.chart .gap-label { fill: var(--ink); font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums; }
.chart .end-label { font-size: 12px; font-weight: 600; font-variant-numeric: tabular-nums; }
.chart .end-compound { fill: var(--brand); }
.chart .end-simple { fill: var(--simple); }
.chart .end-lead { stroke-width: 1.5; }
.chart .lead-compound { stroke: var(--brand); }
.chart .lead-simple { stroke: var(--simple); }
.chart-note { color: var(--muted); font-size: .85rem; margin: 6px 0 0; }
.chart .dot-compound { fill: var(--interest); }
.chart .dot-simple { fill: var(--simple); }
.chart .hit { fill: transparent; }
.chart .hit:hover { fill: var(--line); opacity: .35; }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .axis { fill: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.disclaimer { color: var(--muted); font-size: .85rem; margin: 14px 0 0; border-top: 1px solid var(--line); padding-top: 12px; }

.table-section { padding-bottom: 12px; }
details { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; }
summary { cursor: pointer; font-weight: 600; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin-top: 12px; font-variant-numeric: tabular-nums; }
th, td { text-align: right; padding: 8px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { color: var(--muted); font-weight: 600; font-size: .9rem; }

.guide { padding-top: 24px; padding-bottom: 48px; max-width: 760px; }
.guide h2 { font-size: 1.45rem; margin: 34px 0 8px; }
.guide h3 { font-size: 1.1rem; margin: 22px 0 4px; }
.formula { font-size: 1.2rem; font-weight: 600; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; display: inline-block; max-width: 100%; }
.guide h1 { margin-top: 10px; }

.site-footer { border-top: 1px solid var(--line); background: var(--panel); padding: 20px 0; font-size: .9rem; }
.site-footer p { margin: 4px 0; }
.site-footer .footer-links { display: flex; flex-wrap: wrap; gap: 4px 18px; margin: 0 0 10px; }
.footer-links a { display: inline-block; padding: 3px 0; }