/* Layout: a working instrument. Form column beside a results sheet that reads like a printed life table. */
:root {
  --paper: #f5f8f7;
  --panel: #ffffff;
  --soft: #e7efed;
  --ink: #13201f;
  --muted: #566563;
  --line: #d3dddb;
  --accent: #0c5c60;
  --accent-ink: #ffffff;
  --accent-soft: #d6ebe9;
  --warn: #8a5300;
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #c98500;
  --display: "Source Serif 4", "Georgia", "Times New Roman", serif;
  --body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --radius: 6px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0e1716; --panel: #142120; --soft: #1a2b29; --ink: #e4edeb; --muted: #9caeab;
    --line: #2a3a38; --accent: #63b9b5; --accent-ink: #062120; --accent-soft: #1d3a38; --warn: #e3a74a;
    --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0e1716; --panel: #142120; --soft: #1a2b29; --ink: #e4edeb; --muted: #9caeab;
  --line: #2a3a38; --accent: #63b9b5; --accent-ink: #062120; --accent-soft: #1d3a38; --warn: #e3a74a;
  --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 16px/1.55 var(--body);
}
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.wrap {
  max-width: 1160px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

/* Header */
.site-head { border-bottom: 1px solid var(--line); background: var(--panel); }
.site-head .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; padding-block: 14px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand svg { flex: none; }
.brand b { font: 600 19px/1.1 var(--display); letter-spacing: -0.01em; }
.brand small { display: block; font: 500 11px/1.2 var(--body); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 15px; }
.nav a { color: var(--muted); text-decoration: none; padding: 4px 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; }

/* Intro */
.intro { padding-block: 36px 20px; display: grid; gap: 10px; max-width: 760px; }
.eyebrow { font: 500 12px/1 var(--body); letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin: 0; }
h1, h2, h3 { font-family: var(--display); text-wrap: balance; letter-spacing: -0.01em; margin: 0; }
h1 { font-weight: 600; font-size: clamp(30px, 4.2vw, 44px); line-height: 1.1; }
.intro p.lede { margin: 0; font-size: 18px; color: var(--muted); max-width: 62ch; }

/* Tool grid */
.tool { display: grid; grid-template-columns: minmax(0, 340px) minmax(0, 1fr); gap: 24px; align-items: start; padding-block: 8px 40px; }
@media (max-width: 880px) { .tool { grid-template-columns: minmax(0, 1fr); } }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
form.inputs { padding: 20px; display: grid; gap: 20px; }
fieldset { border: 0; margin: 0; padding: 0; display: grid; gap: 12px; min-width: 0; }
legend { font: 600 17px/1.2 var(--display); padding: 0; margin-bottom: 4px; }
.field { display: grid; gap: 4px; }
.field > label, .field > span.lbl { font-size: 14px; font-weight: 500; }
.hint { font-size: 13px; color: var(--muted); }
input[type="text"], input[type="number"], select {
  font: inherit; color: var(--ink); background: var(--paper); border: 1px solid var(--line);
  border-radius: 4px; padding: 9px 11px; width: 100%; min-width: 0;
}
input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 0; border-color: var(--accent); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.seg { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label { text-align: center; padding: 9px 6px; cursor: pointer; font-size: 15px; background: var(--paper); }
.seg label + input + label, .seg input + label + input + label { border-left: 1px solid var(--line); }
.seg input:checked + label { background: var(--accent); color: var(--accent-ink); font-weight: 500; }
.seg input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: -2px; }
.check { display: flex; gap: 10px; align-items: center; font-weight: 500; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.pc-status { font-size: 13px; color: var(--muted); min-height: 1.4em; }
.pc-status.ok { color: var(--ink); }
.pc-status.warn { color: var(--warn); }
.divider { border: 0; border-top: 1px solid var(--line); margin: 0; }
details.adv summary { cursor: pointer; font-weight: 500; font-size: 14px; color: var(--muted); }
details.adv[open] summary { margin-bottom: 12px; }
details.adv .field + .field { margin-top: 12px; }

/* Results */
.results { padding: 22px; display: grid; gap: 22px; min-width: 0; }
.headline { font: 400 clamp(19px, 2.2vw, 23px)/1.35 var(--display); margin: 0; max-width: 54ch; }
.headline strong { font-weight: 650; color: var(--accent); }
.basis { font-size: 13px; color: var(--muted); margin: 6px 0 0; }
.table-wrap { overflow-x: auto; }
table.lt { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; min-width: 420px; }
table.lt caption { text-align: left; font-size: 13px; color: var(--muted); padding-bottom: 8px; }
table.lt th, table.lt td { padding: 10px 12px; text-align: right; border-bottom: 1px solid var(--line); }
table.lt thead th { font: 500 12px/1.3 var(--body); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); vertical-align: bottom; }
table.lt thead th .key { display: inline-block; width: 18px; height: 0; border-top: 3px solid; vertical-align: middle; margin-right: 6px; border-radius: 2px; }
table.lt thead th .key.dash { border-top-style: dashed; }
table.lt th[scope="row"] { text-align: left; font-family: var(--mono); font-weight: 500; }
table.lt th[scope="row"] span { display: block; font: 400 12px/1.2 var(--body); color: var(--muted); }
table.lt td { font: 500 20px/1 var(--mono); }
table.lt td small { font: 400 12px var(--body); color: var(--muted); margin-left: 2px; }
table.lt tr.mid td, table.lt tr.mid th { background: var(--soft); }
table.lt tr.mean td { font-size: 16px; color: var(--muted); border-bottom: 0; }
table.lt tr.mean th { font-family: var(--body); font-size: 14px; }
@media (max-width: 560px) {
  .results { padding: 16px; }
  table.lt { min-width: 0; }
  table.lt th, table.lt td { padding: 9px 5px; }
  table.lt thead th { font-size: 10.5px; letter-spacing: 0.03em; }
  table.lt thead th .key { display: block; margin: 0 0 4px auto; }
  table.lt td { font-size: 17px; }
  table.lt td small { display: none; }
  table.lt th[scope="row"] { font-size: 14px; }
  table.lt th[scope="row"] span { font-size: 11px; }
  table.lt tr.mean th { font-size: 12px; }
  table.lt tr.mean td { font-size: 14px; }
}
.chart-box { position: relative; height: 320px; max-width: 100%; }
@media (max-width: 520px) { .chart-box { height: 260px; } }
.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn { font: 500 15px/1 var(--body); border-radius: 4px; padding: 12px 18px; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink); cursor: pointer; display: inline-flex; gap: 8px; align-items: center; }
.btn:hover { filter: brightness(1.08); }
.btn[disabled] { opacity: 0.6; cursor: progress; }
.small { font-size: 13px; color: var(--muted); }
.note-list { margin: 0; padding-left: 18px; display: grid; gap: 4px; font-size: 13px; color: var(--muted); }

/* Ads (hidden until configured) */
.ad-slot { margin-block: 8px; text-align: center; min-height: 0; }
.ad-slot .ad-label { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }

/* Guides strip */
.guides { padding-block: 8px 48px; display: grid; gap: 16px; }
.guides h2 { font-size: 24px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px; }
.card { padding: 18px; display: grid; gap: 6px; text-decoration: none; color: var(--ink); background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
.card:hover { border-color: var(--accent); }
.card h3 { font-size: 18px; }
.card p { margin: 0; font-size: 14px; color: var(--muted); }

/* Article pages */
.article { padding-block: 36px 56px; display: grid; gap: 18px; max-width: 700px; }
.article h1 { font-size: clamp(28px, 4vw, 40px); }
.article h2 { font-size: 23px; margin-top: 14px; }
.article p, .article li { font-size: 17px; line-height: 1.65; }
.article p { margin: 0; }
.article ul, .article ol { margin: 0; padding-left: 22px; display: grid; gap: 6px; }
.article .meta { font-size: 14px; color: var(--muted); }
.article figure { margin: 0; }
.article table { border-collapse: collapse; font-variant-numeric: tabular-nums; width: 100%; min-width: 380px; }
.article th, .article td { border-bottom: 1px solid var(--line); padding: 8px 10px; text-align: right; font-size: 15px; }
.article th:first-child, .article td:first-child { text-align: left; }
.article thead th { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 500; }
.article figcaption { font-size: 13px; color: var(--muted); margin-top: 6px; }
.callout { background: var(--accent-soft); border-radius: var(--radius); padding: 14px 16px; }
.cta { justify-self: start; text-decoration: none; }

/* Footer */
.site-foot { border-top: 1px solid var(--line); background: var(--panel); }
.site-foot .wrap { padding-block: 24px 32px; display: grid; gap: 10px; font-size: 13px; color: var(--muted); }
.site-foot p { margin: 0; max-width: 95ch; }
.site-foot nav { display: flex; flex-wrap: wrap; gap: 6px 16px; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }