:root {
  --bg: #f6f8f5;
  --surface: #ffffff;
  --forest: #143d2b;
  --muted: #4b6357;
  --border: #d8e2da;
  --lime: #65a30d;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--forest); font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
a { color: var(--forest); text-decoration: none; }
.wrap { max-width: 1020px; margin: 0 auto; padding: 0 24px; }
header { border-bottom: 1px solid var(--border); background: var(--surface); }
.nav { height: 66px; display: flex; justify-content: space-between; align-items: center; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.brand img { width: 24px; height: 24px; }
.nav-links { display: flex; gap: 22px; font-size: 14px; color: var(--muted); }
.nav-links a.active, .nav-links a:hover { color: var(--forest); font-weight: 600; }
.split { display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; padding: 64px 0; align-items: center; border-bottom: 1px solid var(--border); }
@media (max-width: 760px) { .split { grid-template-columns: 1fr; } }
h1 { font-size: clamp(30px, 4.3vw, 44px); line-height: 1.15; margin: 0 0 16px; }
.lead { color: var(--muted); margin: 0 0 24px; }
.calc { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 24px; }
.calc label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
input[type=range] { width: 100%; accent-color: var(--lime); }
.big-num { font-size: 30px; font-weight: 700; color: var(--forest); margin: 10px 0 4px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; padding: 52px 0; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 22px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
footer { border-top: 1px solid var(--border); padding: 28px 0; font-size: 13px; color: var(--muted); }
.foot-row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }