:root {
  --bg: #f7f7f4;
  --surface: #ffffff;
  --text: #1c2321;
  --muted: #5a6562;
  --line: #dfe2dc;
  --accent: #0b6e4f;
  --accent-soft: #e4f2ec;
  --error: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141816;
    --surface: #1d2321;
    --text: #edf0ee;
    --muted: #a5afab;
    --line: #333b38;
    --accent: #5fd0a7;
    --accent-soft: #1f3a30;
    --error: #ff9c94;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

a { color: var(--accent); }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }

.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 20px; padding-block: 12px; }
.brand { font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--text); }
.site-header nav { display: flex; flex-wrap: wrap; gap: 2px 14px; font-size: .92rem; }
.site-header nav a { color: var(--muted); text-decoration: none; }
.site-header nav a:hover { color: var(--accent); }

main { padding-block: 28px 44px; }
h1 { font-size: clamp(1.7rem, 5vw, 2.2rem); line-height: 1.2; margin: 0 0 10px; }
h2 { font-size: 1.3rem; line-height: 1.3; margin: 32px 0 8px; }
.lead { color: var(--muted); margin-top: 0; }

.calc {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  margin: 20px 0;
}
.calc h2 { margin-top: 0; font-size: 1.08rem; }
.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; }
.fields label span { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 3px; }
input, select {
  width: 100%;
  min-height: 44px;
  padding: 8px 10px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.result { margin-top: 16px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; }
.stat { padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; min-width: 0; }
.stat-main { background: var(--accent-soft); border-color: transparent; }
.stat-label { display: block; font-size: .85rem; color: var(--muted); }
.stat-value { display: block; font-size: 1.3rem; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
.error { color: var(--error); margin: 0; }

.table-box { margin-top: 12px; }
.table-box summary { cursor: pointer; color: var(--accent); font-weight: 600; min-height: 32px; }
.table-scroll { overflow-x: auto; max-height: 420px; margin-top: 8px; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; font-variant-numeric: tabular-nums; }
th, td { padding: 6px 10px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { position: sticky; top: 0; background: var(--surface); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-top: 20px; }
.card {
  display: block;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
}
.card:hover { border-color: var(--accent); }
.card strong { display: block; color: var(--accent); }
.card span { font-size: .92rem; color: var(--muted); }

.note { font-size: .92rem; color: var(--muted); border-left: 3px solid var(--line); padding-left: 12px; }

.checks { display: grid; gap: 4px; }
.check { display: flex; align-items: flex-start; gap: 10px; min-height: 44px; padding: 8px 0; cursor: pointer; }
.check input { width: 20px; height: 20px; min-height: 0; margin: 3px 0 0; flex: none; accent-color: var(--accent); }

h2[id] { scroll-margin-top: 16px; }
td:first-child, th:first-child { text-align: left; }

.site-footer { border-top: 1px solid var(--line); padding-block: 20px; font-size: .9rem; color: var(--muted); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
.site-footer a { color: var(--muted); }