.dca-calculator{min-height:100vh;padding:2rem 0;background:#fff}.calculator-card{background:#fff;border-radius:20px;box-shadow:0 20px 40px rgba(0,0,0,.1);overflow:hidden;max-width:1200px;margin:0 auto}.input-panel{background:linear-gradient(135deg,#f8f9fa 0,#e9ecef 100%);border-right:1px solid #dee2e6}.results-panel{background:linear-gradient(135deg,#fff 0,#f8f9fa 100%)}.bitcoin-icon{color:#f7931a}.form-control:focus{border-color:#f7931a;box-shadow:0 0 0 .2rem rgba(247,147,26,.25)}.btn-bitcoin{background:linear-gradient(135deg,#f7931a 0,#e68019 100%);border:none;color:#fff;font-weight:600;transition:all .3s ease}.btn-bitcoin:hover{background:linear-gradient(135deg,#e68019 0,#d46e15 100%);color:#fff;transform:translateY(-2px);box-shadow:0 5px 15px rgba(247,147,26,.3)}.btn-bitcoin:disabled{background:#6c757d;transform:none;box-shadow:none}.metric-card{background:#fff;border-radius:10px;padding:1.5rem;margin-bottom:1rem;box-shadow:0 5px 15px rgba(0,0,0,.05);border-left:4px solid #f7931a}.metric-item{padding:.5rem 0;border-bottom:1px solid #e9ecef}.metric-item:last-child{border-bottom:none}.metric-value{font-size:1.1rem;font-weight:600;color:#495057;margin-top:.25rem}.profit-percentage{font-size:.8rem;margin-top:.1rem}.profit-positive{color:#28a745}.profit-negative{color:#dc3545}.chart-container{background:#fff;border-radius:10px;padding:1rem;margin:1rem 0;box-shadow:0 5px 15px rgba(0,0,0,.05);min-height:300px}.loading-spinner{border:4px solid #f3f3f3;border-top:4px solid #f7931a;border-radius:50%;width:50px;height:50px;animation:spin 1s linear infinite;margin:0 auto}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.summary-box{background:#dbeafe;color:#333;border-radius:10px;padding:1rem;margin:1rem 0;border:1px solid #e3f2fd;text-align:left}.tooltip-data{background:#f8f9fa;border-radius:10px;padding:1rem;margin-top:1rem;border:1px solid #dee2e6}.tooltip-item{display:flex;justify-content:space-between;margin-bottom:.5rem}.tooltip-item:last-child{margin-bottom:0}.results-loading{display:flex;align-items:center;justify-content:center;height:100%}.results-empty{display:flex;align-items:center;justify-content:center;height:100%}.results-content{display:block}.results-content.hidden{display:none}.results-loading.hidden{display:none}.results-empty.hidden{display:none}@media (max-width:768px){.input-panel{border-right:none;border-bottom:1px solid #dee2e6}.metric-card{padding:1rem}.chart-container{padding:1rem}.calculator-card{margin:1rem}}