h2{text-align:center;color:#333;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;margin-bottom:20px;font-weight:400}#scientific-calculator{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background:#f8f9fa;border:1px solid #e9ecef;border-radius:15px;box-shadow:0 4px 20px rgb(0 0 0 / .1);padding:25px;max-width:600px;margin:20px auto;display:flex;flex-direction:column;gap:20px;color:#333}.calculator-header{display:flex;justify-content:center;align-items:center;margin-bottom:10px}.mode-toggle{display:flex;gap:5px}.mode-btn{background:#e9ecef;border:1px solid #ced4da;border-radius:8px;padding:8px 15px;color:#495057;font-size:.9em;cursor:pointer;transition:all 0.3s ease}.mode-btn.active{background:#007bff;color:#fff;border-color:#007bff}.calculator-display{background:#2c3e50;border:1px solid #34495e;border-radius:10px;padding:20px;margin-bottom:15px}.expression-display{font-size:1em;color:#95a5a6;min-height:20px;text-align:right;margin-bottom:10px}#calculator-input{width:100%;padding:0;font-size:2.5em;text-align:right;border:none;background:#fff0;color:#fff;box-sizing:border-box;font-weight:300}#calculator-input:focus{outline:none}.calculator-buttons{display:grid;grid-template-columns:repeat(9,1fr);gap:8px}.btn{background:#fff;border:1px solid #e9ecef;border-radius:8px;padding:8px 8px;font-size:1.1em;cursor:pointer;transition:all 0.2s ease;color:#333;font-weight:500;min-height:40px;display:flex;align-items:center;justify-content:center}.btn:hover{background:#f8f9fa;border-color:#ced4da;transform:translateY(-1px);box-shadow:0 2px 8px rgb(0 0 0 / .1)}.btn:active{transform:translateY(0);background:#e9ecef}.btn.number{background:#fff;font-weight:800;color:#333;font-size:1.1em}.btn.number:hover{background:#f8f9fa}.btn.operator{background:#007bff;color:#fff;border-color:#007bff;font-weight:600}.btn.operator:hover{background:#0056b3;border-color:#0056b3}.btn.operator.clear{background:#dc3545;border-color:#dc3545}.btn.operator.clear:hover{background:#c82333;border-color:#c82333}.btn.operator.equals{background:#28a745;border-color:#28a745;grid-column:span 1}.btn.operator.equals:hover{background:#218838;border-color:#218838}.btn.function{background:#f8f9fa;border-color:#e9ecef;font-size:1em;color:#495057}.btn.function:hover{background:#e9ecef;border-color:#ced4da}.btn.function.special{background:#ffc107;color:#212529;border-color:#ffc107}.btn.function.special:hover{background:#e0a800;border-color:#e0a800}.btn.zero{grid-column:span 1}#scientific-calculator{width:100%;max-width:600px;margin:0 auto;box-sizing:border-box}.calculator-buttons{display:grid;grid-template-columns:repeat(9,1fr);gap:8px}@media (max-width:992px){#scientific-calculator{max-width:100%;padding:10px}.calculator-buttons{gap:6px}.btn{min-height:30px;font-size:.85em;padding:6px 2px}#calculator-input{font-size:1.8em}}@media (max-width:768px){.btn{min-height:28px;font-size:.8em}#calculator-input{font-size:1.6em}}@media (max-width:576px){.calculator-buttons{gap:4px}.btn{min-height:24px;font-size:.7em;padding:4px 1px}#calculator-input{font-size:1.5em}.expression-display{font-size:.8em}}@media (max-width:360px){.btn{min-height:22px;font-size:.65em}#calculator-input{font-size:1.4em}}#scientific-calculator .calculator-display #calculator-input{color:#fff!important}#scientific-calculator .calculator-display .expression-display{color:#95a5a6!important}#scientific-calculator .btn{color:#333!important;line-height:1.2}#scientific-calculator .btn.function{color:#495057!important}#scientific-calculator .btn.operator,#scientific-calculator .btn.operator.clear,#scientific-calculator .btn.operator.equals{color:#fff!important}#scientific-calculator button svg{fill:currentColor!important;stroke:currentColor!important}