:root {
  --paper: #f6f3ea;
  --card: #fffdf7;
  --ink: #1c2622;
  --muted: #5b6862;
  --line: #ddd6c4;
  --accent: #1f5f4a;
  --accent-ink: #f4efe2;
  --gold: #b9832a;
  --warn-bg: #fbeedd;
  --warn: #8a4b0f;
  --good: #1f6b3a;
  --focus: #2f7dd1;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141a17; --card: #1b2320; --ink: #e9e5da; --muted: #a3ada7; --line: #2f3a35;
    --accent: #6fc3a0; --accent-ink: #10201a; --gold: #e2b25c; --warn-bg: #3a2a17; --warn: #f2c48a; --good: #8fd6a4;
    color-scheme: dark;
  }
}
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--sans); }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }

.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font: 700 22px/1 var(--serif); color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.logo img { width: 28px; height: 28px; }
.site-header nav a { font-size: 15px; font-weight: 600; text-decoration: none; }

.crumbs { font-size: 14px; color: var(--muted); margin: 20px 0 0; }
.crumbs a { color: var(--muted); }
h1, h2, h3 { font-family: var(--serif); line-height: 1.2; letter-spacing: -0.01em; }
h1 { font-size: clamp(30px, 5vw, 44px); margin: 12px 0 10px; }
h2 { font-size: 26px; margin: 40px 0 12px; }
.lede { font-size: 19px; color: var(--muted); max-width: 70ch; margin: 0 0 24px; }

.calc-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 20px; align-items: start; }
@media (max-width: 820px) { .calc-grid { grid-template-columns: 1fr; } }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
form.calc { display: grid; gap: 14px; }
.field { display: grid; gap: 5px; }
.field label { font-weight: 600; font-size: 15px; }
.field small { color: var(--muted); font-size: 13px; line-height: 1.4; }
.input-wrap { display: flex; align-items: center; border: 1.5px solid var(--line); border-radius: 8px; background: var(--paper); }
.input-wrap:focus-within { border-color: var(--accent); }
.input-wrap input { flex: 1; min-width: 0; border: 0; background: transparent; color: inherit; font: 600 18px/1 var(--sans); padding: 11px 12px; font-variant-numeric: tabular-nums; }
.input-wrap input:focus { outline: none; }
.affix { color: var(--muted); padding: 0 12px; font-weight: 600; }
.input-wrap .affix:first-child { padding-right: 0; }
select { width: 100%; border: 1.5px solid var(--line); border-radius: 8px; background: var(--paper); color: inherit; font: 600 17px/1.2 var(--sans); padding: 11px 10px; }
.field.invalid .input-wrap { border-color: #c2412d; }
.err { color: #c2412d; font-size: 13px; min-height: 0; }
.err:empty { display: none; }
form.calc .actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
form.calc .share { border: 1.5px solid var(--line); background: transparent; color: var(--accent); border-radius: 8px; font: 600 15px/1 var(--sans); padding: 12px 14px; cursor: pointer; }
form.calc button[type=submit] { justify-self: start; border: 0; border-radius: 8px; background: var(--accent); color: var(--accent-ink); font: 700 16px/1 var(--sans); padding: 13px 22px; cursor: pointer; }

.result { position: sticky; top: 16px; }
@media (max-width: 820px) { .result { position: static; } }
.headline { display: grid; gap: 2px; padding-bottom: 16px; border-bottom: 2px solid var(--ink); margin-bottom: 14px; }
.headline .label { font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.headline .big { font: 700 clamp(38px, 7vw, 54px)/1.05 var(--serif); font-variant-numeric: lining-nums tabular-nums; color: var(--accent); }
.headline .sub { color: var(--muted); font-size: 15px; }
dl.items { margin: 0; display: grid; }
dl.items div { display: flex; justify-content: space-between; gap: 16px; padding: 8px 0; border-bottom: 1px dashed var(--line); }
dl.items dt { color: var(--muted); }
dl.items dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; text-align: right; }
dl.items .em dt { color: var(--ink); font-weight: 600; }
dl.items .em dd { color: var(--accent); }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; font-size: 15px; }
th, td { padding: 7px 8px; text-align: right; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child { text-align: left; }
thead th { font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
table.compare { margin: 6px 0 12px; }
table.compare caption { text-align: left; font-weight: 700; padding-bottom: 6px; }
table.compare tbody th { font-weight: 500; color: var(--muted); }
.warn { background: var(--warn-bg); color: var(--warn); border-radius: 8px; padding: 10px 12px; font-size: 15px; }
.note { color: var(--muted); font-size: 14px; line-height: 1.5; }
.explain { margin: 14px 0; padding: 4px 0 4px 12px; border-left: 3px solid var(--accent); font-size: 15px; line-height: 1.55; }
.result-error { background: var(--warn-bg); color: var(--warn); border-radius: 8px; padding: 14px; font-weight: 600; }
details.schedule { margin-top: 14px; }
details.schedule summary { cursor: pointer; font-weight: 700; color: var(--accent); padding: 6px 0; }
.schedule-tabs { display: flex; gap: 6px; margin: 8px 0; }
.schedule-tabs button { border: 1.5px solid var(--line); background: transparent; color: inherit; border-radius: 999px; padding: 5px 12px; font: 600 14px var(--sans); cursor: pointer; }
.schedule-tabs button[aria-pressed=true] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
[data-panel] { max-height: 460px; overflow: auto; }
[data-panel] thead th { position: sticky; top: 0; background: var(--card); }

.content { max-width: 74ch; }
.content p, .content li { margin: 0 0 12px; }
.formula { font-family: var(--serif); font-size: 19px; background: var(--card); border-left: 4px solid var(--gold); padding: 10px 14px; border-radius: 0 8px 8px 0; overflow-x: auto; }
.faq details { border-bottom: 1px solid var(--line); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 700; font-size: 18px; }
.faq details p { margin: 10px 0 0; }
.sources ul { padding-left: 20px; }
.sources .reviewed { color: var(--muted); font-size: 14px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; padding: 0; list-style: none; }
.cards a { display: block; height: 100%; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; text-decoration: none; color: var(--ink); }
.cards a:hover { border-color: var(--accent); }
.cards strong { display: block; font-family: var(--serif); font-size: 19px; color: var(--accent); margin-bottom: 4px; }
.cards span { font-size: 14px; color: var(--muted); line-height: 1.45; display: block; }
.cat-title { font-size: 15px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); font-family: var(--sans); margin: 28px 0 10px; }

.disclaimer { font-size: 14px; color: var(--muted); border-top: 1px solid var(--line); margin-top: 40px; padding-top: 16px; }
.site-footer { margin-top: 48px; border-top: 1px solid var(--line); padding: 28px 0 40px; font-size: 15px; }
.foot-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; }
.foot-grid h3 { font: 700 13px/1.2 var(--sans); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 8px; }
.foot-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.foot-grid a { color: var(--ink); text-decoration: none; }
.foot-grid a:hover { color: var(--accent); text-decoration: underline; }
.fine { color: var(--muted); font-size: 13px; margin-top: 24px; }

@media print {
  .site-header, .site-footer, .crumbs, .lede, form.calc, .share, .schedule-tabs, .content, .related, .disclaimer, .ad { display: none !important; }
  body { background: #fff; color: #000; font-size: 12px; }
  .calc-grid { display: block; }
  .panel { border: 0; padding: 0; }
  details.schedule > *:not(summary) { display: block !important; }
  [data-panel] { max-height: none; overflow: visible; }
  [data-panel][hidden] { display: none !important; }
}

/* AdSense Auto ads: an ad Google injects inside the calculator grid spans the full width
   instead of becoming a squeezed third grid cell. Never hide ads with CSS (AdSense policy);
   keep ads out of the calculator with AdSense's own "excluded areas" setting instead. */
.calc-grid > ins, .calc-grid > .google-auto-placed { grid-column: 1 / -1; }
.google-auto-placed { margin: 24px 0; }