body{font-family:system-ui,Arial,sans-serif;max-width:760px;margin:0 auto;padding:20px;color:#222;line-height:1.6}
header a,footer a{margin-right:14px;color:#2f4f3e}h1,h2{color:#2f4f3e}
.btn{display:inline-block;background:#2f4f3e;color:#fff;padding:12px 22px;border-radius:6px;text-decoration:none;font-weight:bold}
.calc label{display:block;margin:8px 0 2px}.calc input{width:160px;padding:6px}.out{background:#f4f1ea;padding:12px;border-radius:6px;margin-top:12px}
small{color:#666}