*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,sans-serif;color:#1f2a1f;background:#f7f8f4}
header{background:#2f5d3a;color:#fff;padding:12px 20px;display:flex;flex-wrap:wrap;gap:16px;align-items:center}
header a{color:#fff;text-decoration:none}.logo{font-weight:700;font-size:1.3em}nav{display:flex;flex-wrap:wrap;gap:14px}
main{max-width:820px;margin:0 auto;padding:20px}.lead{font-size:1.1em;color:#445}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.card{display:block;background:#fff;border:1px solid #dde3d6;border-radius:10px;padding:14px;color:inherit;text-decoration:none}.card:hover{border-color:#2f5d3a}.card h2{margin:0 0 6px;font-size:1.1em;color:#2f5d3a}
.calc{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;background:#fff;padding:16px;border-radius:10px;border:1px solid #dde3d6}
label{display:flex;flex-direction:column;font-size:.9em;gap:4px}input,select{padding:8px;font-size:1em;border:1px solid #bbb;border-radius:6px}
.result{margin:16px 0 28px;padding:16px;background:#e8f2e3;border-radius:10px;font-size:1.15em}
details{background:#fff;border:1px solid #dde3d6;border-radius:8px;padding:8px 12px;margin:8px 0}summary{cursor:pointer;font-weight:600}
footer{text-align:center;padding:24px;color:#667;font-size:.9em}footer a{color:#2f5d3a}