:root{--bg:#f4f6f8;--panel:#fff;--ink:#14212b;--muted:#5d6b78;--line:#dde3e9;--accent:#0b5cad;--neg:#c0392b;--pos:#1e7e4a;font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:var(--ink)}*{box-sizing:border-box}body{margin:0;background:var(--bg);font-size:14px}.topbar{display:flex;gap:24px;align-items:center;padding:10px 20px;background:#0e2a44}.topbar a{color:#dbe7f3;text-decoration:none}.brand{font-weight:700;font-size:17px;color:#fff!important}main{padding:20px}h1{margin:0 0 12px;font-size:20px}h3{margin:18px 0 6px;font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}.estimator{display:grid;grid-template-columns:minmax(0,1fr) 380px;grid-gap:20px;gap:20px;align-items:start}@media (max-width:1000px){.estimator{grid-template-columns:1fr}}fieldset{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:14px;margin:0 0 14px;overflow-x:auto}legend{font-weight:600;padding:0 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