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rgba(0,0,0,.15);border-radius:15px;animation:fadeIn .5s ease}h1,h2{color:var(--primary-color)}.subtitle,h1{text-align:center}h1{margin:0 0 10px;font-size:2.5rem;font-weight:700}.subtitle{color:#666;margin-bottom:25px;font-size:1.1rem}h2{border-bottom:3px solid var(--primary-color);padding-bottom:8px;margin:30px 0 18px;font-weight:600}.form-group{margin-bottom:15px}input[type=number],select{width:100%;padding:12px;border:1.8px solid var(--border-color);border-radius:8px;font-size:1em;transition:border-color .25s ease,box-shadow .25s ease;-webkit-transition:border-color .25s ease,box-shadow .25s ease;-moz-transition:border-color .25s ease,box-shadow .25s ease;background-color:#fff}input[type=number]{margin-top:6px}select{margin:6px 0 0}input[type=number]:focus,select:focus{border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(11,60,93,.15);outline:0}.error-message{color:var(--error-color);font-size:.85em;margin-top:5px;display:none}.flex-row{display:flex;flex-wrap:wrap;gap:20px}.flex-col-2{flex:1 1 45%}.flex-col-3{flex:1 1 30%}.button-group{display:flex;gap:15px;margin-top:28px;flex-wrap:wrap}button{flex:1;min-width:150px;background-color:var(--primary-color);border:0;color:#fff;font-size:1.1em;padding:14px 20px;font-weight:700;border-radius:8px;cursor:pointer;transition:background-color .3s ease,transform .1s ease,box-shadow .3s ease;-webkit-transition:background-color .3s ease,transform .1s ease,box-shadow .3s ease;-moz-transition:background-color .3s ease,transform .1s ease,box-shadow .3s ease;display:flex;align-items:center;justify-content:center;gap:8px}button:hover{background-color:var(--primary-dark);box-shadow:0 4px 12px rgba(0,0,0,.2)}button:active{transform:scale(.97)}button.secondary{background-color:#6c757d}button.secondary:hover{background-color:#5a6268}button.success{background-color:var(--success-color)}button.success:hover{background-color:#218838}button.info{background-color:var(--info-color)}button.info:hover{background-color:#138496}button:disabled{background-color:#ccc!important;cursor:not-allowed;transform:none;box-shadow:none}.analysis,.marginal-analysis,.results{margin-top:40px;border-radius:10px;background-color:var(--secondary-color);padding:22px 28px;border:2px solid var(--accent-color);display:none}.result-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:15px}.result-item{padding:12px;background:rgba(255,255,255,.7);border-radius:8px;transition:transform .2s}.result-item:hover{transform:translateY(-2px);box-shadow:0 4px 8px rgba(0,0,0,.1)}.result-item strong{color:var(--primary-color);display:block;margin-bottom:5px;font-size:.9rem}.highlight{background:#fff;padding:20px;border-radius:10px;margin-top:20px;border-left:4px solid var(--primary-color);box-shadow:0 2px 8px rgba(0,0,0,.05)}.footer-note{margin-top:48px;font-size:.9em;font-style:italic;color:#555;text-align:center;border-top:1px solid #eee;padding-top:15px}.loading{display:inline-block;width:20px;height:20px;border:3px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:#fff;animation:spin 1s ease-in-out infinite;-webkit-animation:spin 1s ease-in-out infinite;-moz-animation:spin 1s ease-in-out infinite}.export-options{display:flex;gap:15px;margin-top:20px;justify-content:center;flex-wrap:wrap}.sample-data-btn{background-color:#6c5ce7;margin-bottom:20px}.sample-data-btn:hover{background-color:#5f3dc4}.how-to-use{background:linear-gradient(135deg,#667eea 0,#764ba2 100%);color:#fff;padding:25px;border-radius:10px;margin:20px 0;cursor:pointer;transition:all .3s ease}.how-to-use:hover{box-shadow:0 8px 25px rgba(102,126,234,.4);transform:translateY(-2px)}.how-to-use-header{display:flex;align-items:center;justify-content:space-between;font-size:1.3rem;font-weight:700}.how-to-use-content{max-height:0;overflow:hidden;transition:max-height .5s ease}.how-to-use-content ol{padding-left:25px;margin-top:15px}.how-to-use-content li{margin-bottom:12px;line-height:1.5}.how-to-use-content .step-number{display:inline-block;width:30px;height:30px;background:rgba(255,255,255,.2);border-radius:50%;text-align:center;line-height:30px;margin-right:10px;font-weight:700}.tips-box{background:rgba(255,255,255,.1);padding:15px;border-radius:8px;margin-top:15px}.tips-box h4{margin-top:0;color:gold}.toggle-icon{font-size:1.5rem;transition:transform .3s ease}@media (max-width:768px){.container{margin:15px;padding:20px}.flex-col-2,.flex-col-3{flex-basis:100%}.button-group{flex-direction:column}.result-grid{grid-template-columns:1fr}.export-options{flex-direction:column}}@media (max-width:480px){h1{font-size:1.8rem}.container{padding:15px}}@media print{body{background:#fff}.container{box-shadow:none;margin:0;padding:20px}button{display:none!important}.analysis,.marginal-analysis,.results{display:block!important}}