:root {
  --green: #014235;
  --green-soft: #e8f0ee;
  --ink: #1a1a1a;
  --muted: #5b6360;
  --line: #d9dfdd;
  --bg: #ffffff;
  --panel: #f6f8f7;
  --warn: #a12a1a;
  --radius: 10px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.65 "Lato", system-ui, -apple-system, "Segoe UI", sans-serif;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }
a { color: var(--green); }
h1, h2, h3 { font-family: "Fraunces", Georgia, serif; font-weight: 600; line-height: 1.2; color: var(--ink); }
h1 { font-size: clamp(30px, 5vw, 42px); margin: 8px 0 12px; }
h2 { font-size: 26px; margin: 44px 0 12px; }
h3 { font-size: 19px; margin: 24px 0 6px; }

.site-header { border-bottom: 1px solid var(--line); background: #f4f4f2; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 14px; padding-bottom: 14px; }
.brand { text-decoration: none; color: var(--ink); font-size: 13px; letter-spacing: 0.32em; text-transform: uppercase; line-height: 1.3; }
.brand img { display: block; height: 40px; width: auto; }
.header-cta { background: var(--green); color: #fff; text-decoration: none; border-radius: 999px; padding: 9px 16px; font-size: 14px; white-space: nowrap; }

.crumbs { font-size: 14px; color: var(--muted); margin-top: 22px; }
.crumbs a { color: var(--muted); }
.lede { font-size: 19px; color: #333; margin-top: 0; }

.calc { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin: 24px 0; }
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 18px; }
.field label { display: block; font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.field .hint { display: block; font-size: 13px; color: var(--muted); font-weight: 400; }
.field input, .field select {
  width: 100%; font: inherit; font-size: 16px; padding: 9px 11px;
  border: 1px solid #b9c2bf; border-radius: 7px; background: #fff; color: var(--ink);
}
.field input:focus, .field select:focus { outline: 2px solid var(--green); outline-offset: 1px; border-color: var(--green); }
.field.full { grid-column: 1 / -1; }
.toggle { display: flex; gap: 8px; flex-wrap: wrap; }
.field .toggle input { width: auto; padding: 0; margin: 0; accent-color: var(--green); }
.toggle label { font-weight: 400; display: flex; gap: 6px; align-items: center; background: #fff; border: 1px solid #b9c2bf; border-radius: 7px; padding: 7px 11px; cursor: pointer; }

.results { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 16px; }
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; }
.stat { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; }
.stat .k { font-size: 13px; color: var(--muted); }
.stat .v { font-family: "Fraunces", Georgia, serif; font-size: 26px; line-height: 1.25; }
.stat.main { background: var(--green); border-color: var(--green); color: #fff; }
.stat.main .k { color: #cfe0dc; }
.note { font-size: 14px; color: var(--muted); margin: 12px 0 0; }
.warn { color: var(--warn); }

table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 12px 0; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.formula { background: var(--green-soft); border-radius: 8px; padding: 12px 14px; font-family: ui-monospace, Menlo, monospace; font-size: 15px; overflow-x: auto; }

.cta { background: var(--green); color: #fff; border-radius: var(--radius); padding: 22px; margin: 36px 0; }
.cta h2 { color: #fff; margin: 0 0 8px; font-size: 24px; }
.cta p { margin: 0 0 14px; color: #e3eeeb; }
.cta a { display: inline-block; background: #fff; color: var(--green); text-decoration: none; font-weight: 700; border-radius: 999px; padding: 10px 18px; }

.faq details { border-bottom: 1px solid var(--line); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 700; }
.related { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; padding: 0; list-style: none; }
.related a { display: block; border: 1px solid var(--line); border-radius: 8px; padding: 14px; text-decoration: none; color: var(--ink); height: 100%; }
.related a:hover { border-color: var(--green); }
.related b { display: block; font-family: "Fraunces", Georgia, serif; font-size: 18px; color: var(--green); }

.site-footer { border-top: 1px solid var(--line); margin-top: 56px; padding: 22px 0 40px; font-size: 14px; color: var(--muted); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .calc-grid { grid-template-columns: 1fr; }
  .header-cta { display: none; }
  .stat .v { font-size: 23px; }
  th, td { padding: 7px 6px; }
}