:root{--primary-color:#2563eb;--primary-light:#dbeafe;--primary-dark:#1e40af;--gray-light:#f3f4f6;--gray-medium:#9ca3af;--gray-dark:#4b5563;--error-color:#ef4444;--success-color:#10b981;--border-radius:0.5rem;--shadow-sm:0 1px 2px 0 rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -1px rgba(0,0,0,0.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05);--transition-default:all 0.3s ease}.calculator-container{min-height:100vh;width:100%;padding:1rem;background:linear-gradient(180deg,#f8fafc,#e0f2fe);display:flex;flex-direction:column;align-items:center;justify-content:center;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}@media(min-width:768px){.calculator-container{padding:2rem}}.calculator-card{width:100%;max-width:32rem;background-color:#fff;border-radius:var(--border-radius);box-shadow:var(--shadow-lg);overflow:hidden;padding:1.5rem}@media(min-width:768px){.calculator-card{padding:2rem}}.calculator-header{display:flex;align-items:center;justify-content:center;margin-bottom:1.5rem}.calculator-header h1{font-size:1.5rem;font-weight:700;color:var(--gray-dark);margin:0 0 0 .75rem}@media(min-width:768px){.calculator-header h1{font-size:1.75rem}}.calculator-header svg{color:var(--primary-color)}.calculator-modes{display:flex;gap:.5rem;margin-bottom:1.5rem}@media(max-width:640px){.calculator-modes{flex-direction:column}}.calculator-modes button{flex:1;padding:.75rem 1rem;border-radius:var(--border-radius);font-weight:500;transition:var(--transition-default);border:none;cursor:pointer}.calculator-modes button.active{background-color:var(--primary-color);color:#fff;box-shadow:var(--shadow-sm)}.calculator-modes button:not(.active){background-color:var(--gray-light);color:var(--gray-dark)}.calculator-modes button:not(.active):hover{background-color:#e5e7eb}.input-group{display:flex;align-items:flex-start;margin-bottom:1rem}.input-group svg{color:var(--primary-color);margin-right:.5rem;margin-top:.25rem}.input-group .input-wrapper{flex:1}.input-group .input-wrapper label{display:block;font-size:.875rem;font-weight:500;color:var(--gray-dark);margin-bottom:.25rem}.input-group .input-wrapper .input-with-unit{display:flex}.input-group .input-wrapper .input-with-unit input{flex:1;padding:.5rem .75rem;border:1px solid #d1d5db;border-radius:var(--border-radius) 0 0 var(--border-radius);font-size:1rem;transition:var(--transition-default)}.input-group .input-wrapper .input-with-unit input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px rgba(37,99,235,.2)}.input-group .input-wrapper .input-with-unit input::placeholder{color:var(--gray-medium)}.input-group .input-wrapper .input-with-unit select{padding:.5rem 1rem;border:1px solid #d1d5db;border-left:none;border-radius:0 var(--border-radius) var(--border-radius) 0;background-color:var(--gray-light);font-size:1rem;transition:var(--transition-default)}.input-group .input-wrapper .input-with-unit select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px rgba(37,99,235,.2)}.unit-selector{display:flex;align-items:center;margin-bottom:1rem}.unit-selector .label{font-size:.875rem;font-weight:500;color:var(--gray-dark)}.unit-selector select{flex:1;margin-left:.5rem;padding:.5rem .75rem;border:1px solid #d1d5db;border-radius:var(--border-radius);background-color:var(--gray-light);font-size:1rem;transition:var(--transition-default)}.unit-selector select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px rgba(37,99,235,.2)}.calculate-button{width:100%;padding:.75rem;background-color:var(--primary-color);color:#fff;border:none;border-radius:var(--border-radius);font-size:1rem;font-weight:500;cursor:pointer;transition:var(--transition-default);box-shadow:var(--shadow-sm)}.calculate-button:hover{background-color:var(--primary-dark)}.calculate-button:focus{outline:none;box-shadow:0 0 0 3px rgba(37,99,235,.3)}.result-container{margin-top:1.5rem;padding:1rem;background-color:var(--primary-light);border:1px solid #bfdbfe;border-radius:var(--border-radius)}.result-container h3{font-size:1rem;font-weight:500;color:var(--primary-dark);margin-top:0;margin-bottom:.5rem}.result-container .result-value{display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;color:var(--primary-color)}.result-container .formula{margin-top:.75rem;font-size:.875rem;color:var(--gray-dark);text-align:center}.error-message{margin-top:1rem;padding:.75rem;background-color:#fee2e2;border:1px solid #fecaca;border-radius:var(--border-radius);color:var(--error-color);font-size:.875rem}.helper-text{margin-top:1.5rem;font-size:.875rem;color:var(--gray-medium);text-align:center}@media(max-width:640px){.calculator-modes,.input-group{flex-direction:column}.input-group svg{margin-bottom:.5rem}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.result-container{animation:fadeIn .3s ease-out}