:root {
  --bg: #fbfaf7; --fg: #1d1f1c; --muted: #5d625a; --line: #e3e0d8;
  --accent: #2f6f4f; --accent-bg: #eaf3ed; --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #151714; --fg: #ecebe6; --muted: #a4a89f; --line: #30332e; --accent: #7cc39c; --accent-bg: #1e2a22; --card: #1c1e1b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; }
header, main, footer { max-width: 44rem; margin: 0 auto; padding: 0 1rem; }
header { padding-top: 1.25rem; }
header a.brand { color: var(--fg); font-weight: 700; text-decoration: none; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 1.5rem 0 .75rem; }
h2 { font-size: 1.3rem; margin: 2rem 0 .5rem; }
a { color: var(--accent); }
.answer { background: var(--accent-bg); border-left: 4px solid var(--accent); padding: .9rem 1rem; border-radius: 6px; font-size: 1.05rem; }
.meta { color: var(--muted); font-size: .9rem; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; margin: .75rem 0; font-size: .95rem; }
th, td { border-bottom: 1px solid var(--line); padding: .45rem .5rem; text-align: left; vertical-align: top; }
th { font-weight: 600; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.calc { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 1rem; margin: 1rem 0; }
.calc label { display: block; margin: .5rem 0 .2rem; font-weight: 600; font-size: .95rem; }
.calc input, .calc select { width: 100%; max-width: 16rem; padding: .45rem .5rem; font: inherit; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--fg); }
.calc button { margin-top: .75rem; padding: .5rem 1rem; font: inherit; border: 0; border-radius: 6px; background: var(--accent); color: #fff; cursor: pointer; }
.calc output { display: block; margin-top: .75rem; font-weight: 600; }
.disclosure { border-top: 1px solid var(--line); margin-top: 2.5rem; padding-top: 1rem; font-size: .95rem; }
.sources { font-size: .9rem; color: var(--muted); }
footer { margin-top: 3rem; padding-bottom: 2rem; font-size: .85rem; color: var(--muted); }
footer a { color: var(--muted); }