.back-link{display:block;margin-bottom:1rem;color:var(--primary-color, #007bff);text-decoration:none;font-weight:500}.back-link:hover{text-decoration:underline}.calculator-container{--primary-color: #007bff;--card-background: #ffffff;--text-color: #333;--border-radius: 8px;--box-shadow: 0 4px 8px rgba(0, 0, 0, .1);--border-color: #dee2e6;width:100%;margin:2rem auto;box-sizing:border-box}.calculator-container h1{text-align:left;color:var(--primary-color);margin-top:0;margin-bottom:1.5rem}.calculator-tabs{display:flex;border-bottom:1px solid #ccc;margin-bottom:1.5rem;margin-bottom:-1px;position:relative;z-index:1}.calculator-tabs button{background:none;border:none;background:#e9ecef;border:1px solid var(--border-color);border-bottom:none;padding:.8rem 1.2rem;cursor:pointer;font-size:1rem;color:#555;border-bottom:3px solid transparent;margin-bottom:-1px;transition:all .2s ease-in-out;color:#495057;border-radius:var(--border-radius) var(--border-radius) 0 0;margin-right:2px;transition:background-color .2s}.calculator-tabs button:hover{background-color:#f0f0f0;color:#333;background-color:#f8f9fa}.calculator-tabs button.active{color:var(--primary-color, #007bff);border-bottom-color:var(--primary-color, #007bff);background:var(--card-background);color:var(--primary-color);border-bottom-color:var(--card-background);font-weight:600}.calculator-content{background:var(--card-background);border:1px solid var(--border-color);padding:2rem;border-radius:0 var(--border-radius) var(--border-radius) var(--border-radius);box-shadow:var(--box-shadow)}.calculator-content h2,.calculator-content p{margin-top:0;color:#444;border-bottom:1px solid #eee;padding-bottom:.5rem;margin-bottom:1.5rem}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:600;color:#444}.form-group input[type=number]{width:100%;padding:.75rem;border:1px solid #ccc;border-radius:var(--border-radius);box-sizing:border-box;font-size:1rem;background-color:#fff;color:#333}.calculator-content button[type=submit]{width:100%;padding:.75rem;background-color:var(--primary-color);color:#fff;border:none;border-radius:var(--border-radius);font-size:1.1rem;cursor:pointer;transition:background-color .2s;margin-top:.5rem}.calculator-content button[type=submit]:hover{background-color:#0056b3}.result-container{margin-top:1.5rem;text-align:center;font-size:1.2rem;color:#444}.flight-time-result{font-weight:700;color:var(--primary-color)}.result-value.result-low,.result-message.result-low{color:#1c5977;background-color:#e1f5fe;border-color:#b3e5fc}.result-message.result-low:before{content:"🐢"}.result-value.result-good,.result-message.result-good{color:#33691e;background-color:#dcedc8;border-color:#c5e1a5}.result-message.result-good:before{content:"👍"}.result-value.result-ideal,.result-message.result-ideal{color:#1b5e20;background-color:#a5d6a7;border-color:#81c784}.result-message.result-ideal:before{content:"🎯"}.result-value.result-high,.result-message.result-high{color:#b71c1c;background-color:#ffcdd2;border-color:#ef9a9a}.result-message.result-high:before{content:"⚠️"}.motor-size-layout{display:flex;gap:2rem;flex-wrap:wrap-reverse}.heatmap-wrapper{flex:3;min-width:350px;display:grid;grid-template-areas:"y-title grid" ". x-title";grid-template-columns:auto 1fr;grid-template-rows:1fr auto;gap:5px}.y-axis-title{grid-area:y-title;writing-mode:vertical-rl;transform:rotate(180deg);text-align:center;font-weight:700;display:flex;align-items:center;justify-content:center;padding-right:5px}.x-axis-title{grid-area:x-title;text-align:center;font-weight:700;padding-top:5px}.heatmap-grid{grid-area:grid;display:grid;grid-template-columns:30px repeat(12,1fr);grid-template-rows:20px repeat(33,1fr);border:1px solid #ddd}.heatmap-grid .cell{font-size:.7rem;text-align:center;display:flex;align-items:center;justify-content:center}.heatmap-grid .x-label,.heatmap-grid .y-label{background-color:#c2c2c2;font-weight:700;color:#333}.heatmap-grid .data-cell{background-color:#f8f9fa;border-right:1px solid #fff;border-bottom:1px solid #fff;min-height:12px;cursor:pointer;transition:transform .1s ease-in-out}.heatmap-grid .data-cell:hover{transform:scale(1.1);z-index:10;outline:1px solid #333;box-shadow:0 0 5px #00000080}.heatmap-grid .data-cell.bad{background-color:#f8f9fa;color:#7e7e7e}.heatmap-grid .data-cell.sub-optimal{background-color:#b3e5fc;color:#555}.heatmap-grid .data-cell.optimal{background-color:#28a745;font-weight:700}.input-panel{flex:1;min-width:200px}.legend{margin:1.5rem 0}.legend-item{display:flex;align-items:center;margin-bottom:.5rem;color:#444}.legend-color{width:20px;height:20px;margin-right:10px;border:1px solid #ccc}.legend-color.bad{background-color:#f8f9fa}.legend-color.sub-optimal{background-color:#b3e5fc}.legend-color.optimal{background-color:#28a745}.result-summary{margin-top:1.5rem;padding:1rem;background-color:#e9ecef;border-radius:4px;color:#333}#propDiameterMs{width:100%}input[type=file]{color:gray;font-style:oblique}