:root{--bg:#fff;--fg:#1a1f2b;--muted:#5b6475;--line:#e4e7ee;--brand:#0b6e4f;--brand-2:#e8f5ef;--warn:#b3261e;--card:#f7f8fa;--max:860px}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--fg);background:var(--bg)}
a{color:var(--brand)}header,main,footer{max-width:var(--max);margin:0 auto;padding:0 20px}
header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--line)}
header .logo{font-weight:700;text-decoration:none;color:var(--fg);font-size:18px}header nav a{margin-left:16px;font-size:14px;text-decoration:none;color:var(--muted)}
h1{font-size:2rem;line-height:1.2;margin:28px 0 8px}h2{margin-top:2rem}.lead{color:var(--muted);font-size:1.1rem;margin-top:0}
.calc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;margin:20px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
input{width:100%;padding:10px 12px;border:1px solid #c9ceda;border-radius:8px;font-size:16px;background:#fff}
input:focus{outline:2px solid var(--brand);border-color:transparent}
.result{margin-top:18px}.headline{font-size:1.35rem;padding:12px 16px;border-radius:10px;background:var(--brand-2);margin-bottom:10px}
.headline.warn{background:#fdecea;color:var(--warn)}.headline.good{background:#e8f5ef}
.mini-table{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin:14px 0}
.mini-table div{background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 12px}.mini-table span{display:block;font-size:12px;color:var(--muted)}
.chart{width:100%;height:auto;margin-top:10px}.chart .grid{stroke:#e4e7ee;stroke-width:1}.chart .tick{font-size:11px;fill:#5b6475}
.chart .line{fill:none;stroke:var(--brand);stroke-width:2.5}.chart .area{fill:rgba(11,110,79,.12)}
.muted{color:var(--muted)}table{width:100%;border-collapse:collapse;margin:14px 0;font-size:15px}th,td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:right}th:first-child,td:first-child{text-align:left}th{background:var(--card);font-weight:600}
.cta{border:1px solid var(--brand);background:var(--brand-2);border-radius:12px;padding:18px 20px;margin:26px 0}.cta h3{margin:0 0 6px}.cta p{margin:0 0 10px}
.btn{display:inline-block;background:var(--brand);color:#fff!important;padding:10px 16px;border-radius:8px;text-decoration:none;font-weight:600}
.ad{min-height:90px;margin:22px 0;display:flex;align-items:center;justify-content:center;color:#aab;font-size:12px;border:1px dashed var(--line);border-radius:8px}
.faq details{border-bottom:1px solid var(--line);padding:10px 0}.faq summary{cursor:pointer;font-weight:600}
.related{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;margin:14px 0}.related a{display:block;padding:12px;border:1px solid var(--line);border-radius:8px;text-decoration:none;font-size:15px}
footer{border-top:1px solid var(--line);margin-top:40px;padding:24px 20px;font-size:13px;color:var(--muted)}footer a{color:var(--muted);margin-right:12px}
.disc{font-size:13px;color:var(--muted);border-left:3px solid var(--line);padding-left:12px;margin:20px 0}
@media(max-width:600px){h1{font-size:1.55rem}header nav a{margin-left:10px}}