.cas-math-wrap{max-width:980px;margin:24px auto;font-family:Arial,sans-serif;color:#1f2937}
.cas-math-head h2{margin:0 0 8px;font-size:30px;line-height:1.2}
.cas-math-head p{margin:0 0 18px;color:#4b5563;font-size:16px}
.cas-math-card{background:#fff;border:1px solid #dbe3ef;border-radius:18px;box-shadow:0 10px 30px rgba(2,32,71,.06);padding:20px}
.cas-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}
.cas-panel{background:#f8fbff;border:1px solid #e5edf7;border-radius:14px;padding:16px}
.cas-field{margin-bottom:14px}
.cas-field label{display:block;font-weight:700;font-size:14px;margin-bottom:6px}
.cas-field input,.cas-field select,.cas-field textarea{width:100%;padding:12px 14px;border:1px solid #cfd8e3;border-radius:10px;font-size:15px;box-sizing:border-box;background:#fff}
.cas-field textarea{min-height:120px;resize:vertical}
.cas-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
.cas-btn{border:0;background:#1d4ed8;color:#fff;padding:12px 16px;border-radius:10px;font-weight:700;cursor:pointer}
.cas-btn.secondary{background:#64748b}
.cas-result h3{margin-top:0;margin-bottom:12px;font-size:20px}
.cas-output{background:#fff;border:1px solid #dbe3ef;border-radius:12px;padding:12px 14px;margin-bottom:10px;font-size:16px}
.cas-output strong{display:block;font-size:13px;color:#475569;margin-bottom:6px;text-transform:uppercase;letter-spacing:.03em}
.cas-help{font-size:13px;color:#64748b;margin-top:6px}
.cas-inline{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.cas-math-custom{margin:16px 0;padding:14px;background:#f8fbff;border:1px dashed #c8d7eb;border-radius:12px}
@media (max-width:760px){.cas-grid,.cas-inline{grid-template-columns:1fr}.cas-math-head h2{font-size:24px}}