.mc-calculator{max-width:760px;background:#f5f5f5;border:1px solid #ddd;padding:14px;border-radius:14px;font-family:system-ui}
.mc-display{background:#fff;border:2px solid #3b82f6;border-radius:12px;padding:10px;margin-bottom:10px}
.mc-expression{font-size:16px;color:#666;text-align:right;min-height:22px}
.mc-result{font-size:30px;font-weight:700;text-align:right}
.mc-mode{display:flex;gap:6px;margin-bottom:10px}
.mode-btn{padding:4px 12px;border:1px solid #ccc;background:#fff;border-radius:20px;cursor:pointer}
.mode-btn.active{background:#2563eb;color:#fff;border-color:#2563eb}
.mc-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:10px}
.mc-grid button{height:46px;border-radius:12px;border:1px solid #d0d0d0;background:#fff;font-size:15px;cursor:pointer}
.mc-grid button:hover{background:#eef2ff}
.mc-clear{background:#ef4444!important;color:#fff!important;border-color:#dc2626!important}
.mc-eval{background:#2563eb!important;color:#fff!important;font-weight:700}