.mbc{max-width:820px;margin:20px auto;padding:0 16px;box-sizing:border-box;font-family:inherit}
.mbc-card{background:#fff;border-radius:18px;box-shadow:0 10px 30px rgba(0,0,0,.08);padding:26px}
.mbc-title{font-weight:800;font-size:20px;margin:0 0 10px}
.mbc-subtitle{font-size:16px;line-height:1.45;margin:0 0 18px;color:#333}
.mbc-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 16px;margin-bottom:14px}
.mbc-field label{display:block;font-weight:700;font-size:13px;margin-bottom:6px}
.mbc-field input{width:100%;padding:10px 12px;border:1px solid #d7d7d7;border-radius:12px;font-size:15px;box-sizing:border-box}
.mbc-btn{display:inline-block;background:#111;color:#fff;border:0;border-radius:14px;padding:12px 16px;font-weight:900;letter-spacing:.4px;cursor:pointer}
.mbc-btn:active{transform:translateY(1px)}
.mbc-result{margin-top:16px;background:#f3f4f6;border-radius:14px;padding:14px 16px}
.mbc-result h3{margin:0 0 8px;font-size:18px}
.mbc-result p{margin:6px 0;line-height:1.45}
.mbc-note{margin-top:10px;font-size:12px;color:#666}
.mbc-muted{color:#666}
@media (max-width:680px){
  .mbc-card{padding:18px}
  .mbc-grid{grid-template-columns:1fr}
  .mbc-btn{width:100%;text-align:center}
}