.advanced-calculator{max-width:800px;margin:18px auto;padding:16px;border:1px solid #ddd;border-radius:8px;background:white;font-family:Tahoma,Arial,sans-serif;direction:rtl}
.advanced-calculator textarea{width:100%;height:80px;padding:8px;border:1px solid #ccc;border-radius:4px;font-size:14px}
.advanced-calculator button{padding:6px 12px;margin-right:8px}
#calc-result{min-height:40px}