.formula-hero{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:28px;border-radius:22px;margin-bottom:20px;background:linear-gradient(135deg,#0b3150,#105e72);color:#fff}
.formula-hero h2{margin:4px 0 8px;font-size:clamp(26px,4vw,42px)}
.formula-hero p{margin:0;max-width:680px}
.formula-hero>.ico{width:86px;height:86px;opacity:.28}
.formula-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:20px;align-items:start}
.formula-layout>*{min-width:0}
.formula-layout aside{display:grid;gap:20px;position:sticky;top:16px;min-width:0}
.formula-filters{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.formula-filters button{border:1px solid #cbdde8;background:#f2f8fb;color:#123b52;border-radius:999px;padding:9px 13px;font-weight:700}
.formula-filters button.selected{background:#087fc3;border-color:#087fc3;color:#fff}
.formula-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.formula-card{background:#fff;border:1px solid #d7e3ea;border-radius:18px;padding:20px;box-shadow:0 10px 30px rgba(13,53,76,.06)}
.formula-card h2{font-size:19px;margin:12px 0;color:#17394d}
.formula-card p{font-size:14px;color:#355466;line-height:1.45}
.formula-card a{font-size:13px;font-weight:700;color:#087fc3}
.formula-card-top{display:flex;justify-content:space-between;gap:10px}
.formula-card-top span{font-size:12px;font-weight:800;text-transform:uppercase;color:#087fc3}
.formula-card-top small{color:#597684}
.formula-expression{background:#eaf6fb;color:#0b3147;border-left:4px solid #10a2d5;border-radius:9px;padding:14px;font-size:18px;font-weight:800;overflow-wrap:anywhere}
.converter-panel label{display:block;margin:12px 0;font-weight:700}
.converter-panel input,.converter-panel select{width:100%;margin-top:6px}
.converter-panel .primary{width:100%;margin-top:8px}
.formula-source{display:flex;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px solid #d7e3ea;color:#cfe8f5;font-weight:700}
.formula-source span{color:#087fc3;white-space:nowrap}
.context-formula-button{display:flex;align-items:center;gap:8px;width:max-content;max-width:100%;margin:12px 0 18px;padding:10px 14px;border:1px solid #58b8dc;border-radius:12px;background:#e8f7fc;color:#0b5473;font-weight:800}
.context-formula-button .ico{width:19px;height:19px}
.view:not(.active) .context-formula-button{display:none}
.calculator-legend{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:-4px 0 10px}
.calculator-legend div{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:14px;background:#fff;border:1px solid #d7e8ef;box-shadow:0 7px 18px rgba(31,88,112,.08)}
.calculator-legend b{display:grid;place-items:center;min-width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,#e4f7ff,#e8e5ff);color:#075e91;font-size:20px}
.calculator-legend span{font-size:12px;font-weight:800;color:#294b5f}
.calculator-note{margin:0 0 20px;padding:10px 14px;border-radius:10px;background:#fff5d9;color:#654d13;font-size:12px}
.calculator-keys{margin:12px 0;padding:13px 14px;border-radius:11px;background:#142b3c;color:#fff;border-left:5px solid var(--formula-accent,#19a7d8)}
.calculator-keys small{display:block;margin-bottom:5px;color:#8ed9f5;font-size:10px;font-weight:900;letter-spacing:1px}
.calculator-keys strong{display:block;font:700 14px/1.65 ui-monospace,Consolas,monospace;overflow-wrap:anywhere}
.formula-card[data-category=ac]{--formula-accent:#11aee4}.formula-card[data-category=three]{--formula-accent:#745ce6}.formula-card[data-category=comp]{--formula-accent:#f09a32}.formula-card[data-category=motor]{--formula-accent:#e84e7e}.formula-card[data-category=cable]{--formula-accent:#14a47b}.formula-card[data-category=units]{--formula-accent:#d4a313}.formula-card[data-category=reference]{--formula-accent:#667e92}
.formula-card{border-top:5px solid var(--formula-accent,#11aee4)}
@media(max-width:980px){
 .formula-layout{grid-template-columns:minmax(0,1fr)}
 .formula-layout aside{position:static;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
 .formula-cards{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:650px){
 .formula-hero{padding:21px}
 .formula-hero>.ico{display:none}
 .formula-layout aside{grid-template-columns:minmax(0,1fr)}
 .formula-card{padding:17px}
 .formula-expression{font-size:16px}
 .formula-filters{max-width:100%;overflow-x:auto;flex-wrap:nowrap;padding-bottom:4px}
 .formula-filters button{white-space:nowrap}
 .calculator-legend{grid-template-columns:repeat(2,minmax(0,1fr))}
 .calculator-legend div:last-child{grid-column:1/-1}
}