:root{--bg: #f3f6fa;--surface: #ffffff;--text: #182235;--muted: #5b687c;--primary: #2b8cee;--primary-soft: #e9f3ff;--border: #dfe6ef;--radius: 14px}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:radial-gradient(circle at 12% -20%,#dcecff 0%,var(--bg) 40%);color:var(--text)}a{color:inherit;text-decoration:none}main{max-width:1120px;margin:0 auto;padding:24px 16px 72px}.topbar{position:sticky;top:0;z-index:50;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#ffffffde;border-bottom:1px solid var(--border)}.topbar-inner{max-width:1120px;margin:0 auto;display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:10px 16px}.logo{font-weight:800;color:var(--primary)}.search-form input,.form-field input,.form-field select,.filters select{width:100%;border:1px solid var(--border);border-radius:10px;padding:10px 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p{margin:0;color:var(--muted)}.calculator-form{display:grid;gap:12px;padding:22px;border-radius:22px;box-shadow:inset 0 1px #fff,0 14px 24px #1a273d0d}.form-field{display:grid;gap:6px;font-size:14px}.form-field small{color:var(--muted)}.results-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}.result-card{padding:14px;background:linear-gradient(145deg,#fff,#f4f9ff)}.result-label{font-size:12px;color:var(--muted)}.result-value{margin-top:6px;font-weight:700;font-size:20px}.formula-block,.faq-block{padding:18px;border-radius:18px}.faq-item{text-align:left;width:100%;background:#f8fbff;border:1px solid #d9e9ff;border-radius:10px;padding:10px;margin-top:8px}.ad-slot{border:1px dashed #b8c9e3;background:#f5f9ff;border-radius:14px;padding:10px}.ad-label{font-size:11px;color:#607799;text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px}.ad-box{display:grid;place-items:center;border:1px solid #c8daef;border-radius:10px;min-height:90px;color:#6a7f9f;font-size:12px;background:#fff}.ad-slot.infeed .ad-box{min-height:150px}.faq-q{font-weight:700}.faq-a{margin-top:6px;color:var(--muted)}.error-text{color:#b52222;margin:0;font-size:14px}.helper-text{color:var(--muted);font-size:13px}@media(max-width:760px){.topbar-inner{grid-template-columns:1fr}.search-form{order:3}.nav-links{justify-content:flex-end;flex-wrap:wrap;gap:8px}}